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d-Color P325/P330_EN

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1. Media ejector 6 The media level lever solenoid is sensor PS5 energized to advance the media level lever to a position above the media 7 When the media ejector blocks the media ejector sensor the media ejector motor is deenergized 8 The aligning belt up down solenoid is energized to lower the aligning belt UN J A01FT2C054DA 26 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 5 Operations 5 4 6 Media ejector mechanism The printed media stack set stored in the finishing tray is fed out into the main tray The media ejector is advanced or retracted by the drive from the media ejector motor Rotation of the media ejector motor in the forward direction causes the media ejector belt to rotate in the forward direction This causes the media ejector to advance or move in the direction of feeding the media stack set out Rotation of the media ejector motor in the backward direction causes the media ejector belt to rotate in the backward direction This causes the media ejector to retract or move toward the home position The media ejector sensor detects the media ejector at its home position Media ejector sensor PS5 Media ejector motor M1 c AO01FT2C055DA Backward direction A01FT2C056DA Nar Media ejector sensor PS5 Media ejector motor M1 A01FT2C057DA A01FT2C050DA Y108600 3 Theory of Operation 27 Staple finisher Composit
2. e on o Q o ie cs e 72 O 2 E e 9 Fusing deceleration Fusing acceleration Fusing pressure roller 4138102069c2 2nd transfer roller 4138t02069c1 PS6 78 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 19 Conveyance section Registration roller 19 3 6 Media neutralization The charge neutralizing cloth neutralizes any charge left in the media after the 2nd trans fer process The charge residue is grounded through the charge neutralizing cloth to the main body frame d Color P325 P330 Charge neutralizing cloth 4138t02102c0 2nd transfer roller cs e ol as o Q o e 2 O 2 e 9 Y108600 3 Theory of Operation 79 19 Conveyance section Registration roller Theory of operation Ver 1 0 Nov 2006 19 3 7 OHP transparencies detection control To prevent incorrect prints on OHP transparencies the type of the media being conveyed is detected by the OHP sensor The OHP detection is made after the loop has been formed in the media before the reg istration roller e f the output voltage of the OHP sensor is less than a predetermined value the main body considers that the media is a type other than OHP transparencies If the output volt age is the predetermined value or more the main body determines that the media is OHP transparenc
3. rrnnnnvvnnnnnnnvnennnnnannnnnnnnennnnnennnnennnnnnnnnnnnnnenen 17 8 3 3 Toner collecting port shutter mechanism mmeee eee 18 8 3 4 Toner replenishing MECHANISM ien nan rn emen ta nonna masa SEGA d 19 8 3 5 Toner level detection sanden 20 8 3 6 Toner near empty condition detection mn 20 8 3 7 Toner empty condition detection eernnnennnnnnnnnnnrnnnnnnnennnnnnnnenvnnennnrnsnnnnnen 21 8 3 8 Toner empty condition detection control seeeeee 21 8 3 9 Toner cartridge life controLuusearsasssenseueeelsudigdmonneeddv 22 9 Print unit section overall composition 23 Y108600 3 Theory of Operation i d Color P325 P330 e n D Q o e 72 O 2 E e 9 li Theory of operation Ver 1 0 Nov 2006 NR 23 ENN 24 9 2 1 Print unit life detection ecce rete entm knees 24 9 2 2 Print unit CON 24 10 Print unit section photo conductor nnns 25 AES RR NE ENE 25 VEME 25 10 9 NL JJ 26 10 3 1 X Photo conductor drive mechanism rrnnnnnnnnvvrnnnnnnnnnnnnnnnnnnrrrrrrrrnnnnennnennenn 26 10 3 2 Photo conductor post exposure control sesssseeeeeeee 27 10 3 3 Photo conductor total exposure control upon recovery 27 10 3 4 Photo conductor small amount rotation control ssussssssse 27 11 Printunit section charge corona sssssees
4. e 2 O 2 e 9 Intermediate transport motor M3 Media feed clutch 2 CL3 Registration sensor PS4 Registration roller clutch CL2 Sub scan print start signal TOD A011T2E067DA Y108600 3 Theory of Operation 67 d Color P325 P330 cs e on o Q o ie cs e 72 O 2 E e 9 17 Media feed section Tray 2 Theory of operation Ver 1 0 Nov 2006 17 3 4 Media supply level detection control There is a window in the front cover of the cassette for indicating the media supply level When the media lift plate goes up a red lever appears in the window The lower the level of the media stack the more the red portion is visible Lever indicator indicating the media supply level A media empty condition 4138t02607c0 4138t02091c0 T Lever When media is loaded 17 3 5 Media empty condition detection control The media empty message PAPER EMPTY TRAY is displayed on the panel when the empty sensor actuator unblocks the media empty sensor 2 No mechanism is provided for detecting a media near empty condition The media sup ply level indicator replaces this function When media is loaded Media empty sensor 2 PS3 Empty sensor actuator 4138t02092c0 A media empty condition Media lift plate x 4138t02124c0 68 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov
5. e 9 Transport motor M3 Transport section sensor PS2 A01FT2C021DA A01FT2C022DA Y108600 3 Theory of Operation 13 Staple finisher e n o Q o cs e 72 e E e 9 5 Operations Theory of operation Ver 1 0 Nov 2006 5 2 3 Media full detection 14 The media full sensor detects the load capacity of output media in the sub tray When the media holding plate is low the edge of the media holding plate shades the media full sensor When printing starts the output media pushes up the media holding plate and the edge of the plate activates the media full sensor After all media is discharged the media holding plate goes down and the edge of the plate shades the media full sensor If the sensor is shaded the printed media is judged to not have reached the maximum load capacity yet After all media is discharged if the output media in the sub tray keeps the media holding plate up and the media full sensor remains activated the printed media is judged to have reached the maximum load capacity and the operation panel displays the message OUTPUT FULL REMOVE PAPER SUB TRAY If the sensor detects that the Exit Tray is full printing is stopped The message OUTPUT FULL REMOVE PAPER SUB TRAY is removed when the out put media is removed from the sub tray which again shades the media full sensor When the tray is empty Media full sensor PS4 Media holding plate
6. 0 157 4138t02595c0 Y108600 3 Theory of Operation 13 7 Write section Theory of operation Ver 1 0 Nov 2006 7 2 5 Laser light intensity control The laser light intensity control corrects the target level of fluctuations in fine line repro duction and reverse image white on black reproduction that occur due to variations in photo conductor electrostatic characteristics developing characteristics and transfer characteristics part to part variations environment durability tis controlled integrally with other control items by the image stabilization control The laser light intensity control is performed when there is a request made for execution of an image stabilization sequence d Color P325 P330 7 2 6 Registration correction control n a tandem engine that has an image forming process for each color of toner incorrect color registration tends to occur due to variations in parts of the main body used for reg ulating the drawing positions The registration correction control automatically detects and corrects this incorrect color registration e t is controlled integrally with other control items by the image stabilization control The registration correction control is performed when there is a request made for execu tion of image stabilization sequence cs e n o Q o e 72 O 2 E e 9 14 Theory of Operation Y108600 3 Theory of operation Ver 1 0 No
7. 0 av Transport roller aligning belt A01FT2C030DA 16 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 5 Operations 5 3 1 Entrance switch The media path for the media transported from the transport unit is changed so that the media may be fed into the storage section e The transport motor provides the drive for media transport When the entrance solenoid is interrupted Initial condition the entrance media guide is swung down so that the media path leading to the storage section is established Staple finisher Entrance media guide Entrance solenoid SL1 Composition Operation A01FT2C031DA Media Entrance media guide Entrance solenoid SL1 A01FT2C019DA Entrance solenoid SL1 Entrance media guide AO1FT2C018DA Y108600 3 Theory of Operation 17 5 Operations Theory of operation Ver 1 0 Nov 2006 5 3 2 Media transport The media fed off from the transport unit is transported to the main tray section The transport motor and exit motor provide drive for media transport e The entrance sensor and storage section sensor detect media Staple finisher A Operation 1 The transport motor drives the aligning belt to transport the media to the exit roller 2 The exit roller up down motor is energized to lower the exit roller 3 The transport motor drives the exit roller The exit roller
8. 98 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 20 Fusing section 20 3 10 Post print control To prevent the fusing temperature from rising after the print cycle has been run a step wise control is provided using an intermediate temperature between the print tempera ture and the wait temperature A Control start timing There is no new print request received when the trailing edge of the last sheet of media has moved past the exit roller d Color P325 P330 B Control termination timing A predetermined period of time elapses after the post print cycle control has been started A print request is received A door is opened or an error or malfunction occurs C Control operation timing 1 The fusing pressure roller and fusing belt are turned at the specified speed 2 The temperature adjustment is started with the target temperature of the fusing heater lamp 1 set at 160 C correction value At the same time the temperature adjustment is started with the target temperature of the fusing heater lamp 2 set at 140 C 3 The fusing pressure roller and fusing belt are stopped after the lapse of a predeter mined period of time after the post print cycle control has been started 4 The control proceeds to wait control after the lapse of another predetermined period of time after the post print cycle control has been started cs e ol as o Q o e 72 O 2
9. Tray2 switch S5 A E D Tray dets plate Actuator Tray detection plate 4138t02615c0 17 3 9 Media misfeed detection control e f the registration sensor is not activated within a predetermined period of time after a media feed sequence has been started the main body determines that there is a media misfeed It then gives the message PAPER EMPTY TRAY 2 on the panel The media misfeed display can be reset by opening and closing any of the doors e on o Q o ie cs e 72 O e E e 9 70 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 18 Conveyance section IDC sensor 18 Conveyance section IDC sensor 18 1 Composition d Color P325 P330 A011T2C503AA 4138t02060c0 IDC sensor Re NG IDCSB R IDC sensor 3 IDC sensor Fr af e o Q o e 72 9 Q E e 9 DC sensor lever 4138t02082c0 IDC sensor cover Retraction cam 3 Pressure retraction clutch 2 CL5 Y108600 3 Theory of Operation 71 d Color P325 P330 cs e n o Q o ie cs e 72 O 2 E e 9 18 Conveyance section IDC sensor Theory of operation Ver 1 0 Nov 2006 18 1 1 Drive IDC sensor lever IDC sensor cover Pressure retraction clutch 2 CL5 Retraction cam 18 2 Operation 18 2 1 Toner density detectio
10. e 9 20 3 11 Heater OFF control Heater control is suspended when a malfunction or media misfeed occurs or a power save mode signal is received A Control start timing A door is opened or an error or malfunction occurs A power save mode signal is received B Control termination timing All of the following events are reset an open door an error or malfunction that has occurred a power save mode signal that has been received C Control operation details 1 Arequest for heater forced turning OFF control is made for heater control 2 Arequest is made for stopping rotation of the fusing pressure roller and fusing belt 3 Arequest is made for stopping rotation of the reverse roller Y108600 3 Theory of Operation 99 20 Fusing section Theory of operation Ver 1 0 Nov 2006 20 3 12 PPM control The PPM control is performed to prevent the fusing pressure roller and the fusing belt temperatures from going down during a multi print cycle as well as to prevent the tem peratures of the roller and belt edges from going up e When a multi print cycle is run the temperature of the fusing pressure roller and the fus ing belt decrease resulting in the fusing performance of the printed image being degraded To prevent this problem fusing performance is estimated based on the surface tempera ture of the fusing pressure roller the distance between sheets of media is widened according to the media length and fusing speed
11. e d Color P330 Plain paper mm s Thick stock 1 Envelopes Glossy paper 1 OHP transparencies mm s Thick stock 2 Postcards mm s Glossy paper 2 mm s Full color 6 76 Monochrome low PPM 1 2 18 6 61 7 Glossy d Color P325 185 85 7 76 7 Plain paper mm s 7 Thick stock 1 Envelopes Glossy paper 1 OHP transparencies mm s Thick stock 2 Postcards mm s Glossy paper 2 mm s Full color 152 7 6 76 6 76 Monochrome low PPM l E 76 6 61 7 Glossy 52 7 88 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 20 Fusing section B Fusing speed control control of loop before fusing To prevent double transferred images and brush effects from occurring the difference between the fusing speed and the media conveyance speed during image transfer is cor rected The media loop sensor detects the length of the loop formed in the media between the 2nd transfer roller and the fusing pressure roller The fusing speed is then varied accord ing to the length of the loop detected By varying the fusing speed any effects from the fusing pressure roller side part to part variations change of parts over time are pre vented from being transferred to the 2nd transfer section Noloop control is provided to perform the fusing process when envelopes are used to prevent wrinkles See P 78 d Color P325 P330 C Fusing deceleration
12. nary standby state cs e ol as o Q o e 2 O 2 e 9 Y108600 3 Theory of Operation 39 d Color P325 P330 e on o Q o e 2 O 2 E e 9 13 Transfer section 1st transfer 13 3 3 1 40 Theory of operation Ver 1 0 Nov 2006 1st transfer roller pressure operation Rotation of the intermediate transport motor is transmitted by a gear train to the pressure retraction clutch 1 Rotation of the pressure retraction clutch 1 turns the pressure cam which moves the sliding plate As the sliding plate moves the retraction lever turns As the retraction lever turns the 1st transfer roller is pressed against the transfer belt Sliding plate Pressure cam Retraction lever 1st transfer roller Photo conductor 4138t02044c1 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 13 Transfer section 1st transfer 13 3 4 1st transfer roller retraction operation 1 Rotation of the intermediate transport motor is transmitted by a gear train to the pressure retraction clutch 1 2 Rotation of the pressure retraction clutch 1 turns the pressure cam which moves the sliding plate 3 Asthe sliding plate moves the retraction lever turns 4 Asthe retraction lever turns the 1st transfer roller is retracted from the transfer belt Sliding plate Pressure cam Retraction lever 1st transfer roller Photo conduct
13. tion state A risk of fire exists Check the interlock switch and actuator for loosening and check whether the interlock functions properly If the interlock does not function you may receive an electric shock or be injured when you insert your hand in the product e g for clearing paper jam Make sure the wiring cannot come into contact with sharp edges burrs or other pointed parts Current can leak leading to a risk of electric shock or fire Y108600 3 Theory of Operation QD Q S 9 SAFETY AND IMPORTANT WARNING ITEMS Safety Checkpoints NWARNING Make sure that all screws components wiring connec tors etc that were removed for safety check and mainte nance have been reinstalled in the original location Pay Xpcs special attention to forgotten connectors pinched cables DB UT a I AGS gt ie forgotten screws etc A risk of product trouble electric shock and fire exists Handling of Consumables WARNING Toner and developer are not harmful substances but care must be taken not to breathe excessive amounts or let the substances come into contact with eyes etc It may be stimulative If the substances get in the eye rinse with plenty of water immediately When symptoms are noticeable consult a physician Never throw the used cartridge and toner into fire You may be burned due to dust explosion Handling of Service Materials NCAUTION Unplug the power co
14. 2006 17 Media feed section Tray 2 17 3 6 Edge guide plate e Set the appropriate edge guide plate which corresponds to the width of the media to be loaded A4 or 81 2 e No mechanism is provided for detecting the media size Lock plate Lock plate I LJ Edge NG plat 4138t02613c0 A4 position 17 3 7 Trailing edge guide plate e Set the appropriate trailing edge plate which corresponds to the length of the media A4 or 11 The size detection function is not equipped e No mechanism is provided for detecting the media size Lock lever D Positioning plate La aa i Trailing edge Guide plate a 4138t02612c0 A4 11 Position Position 4138t02614c0 Y108600 3 Theory of Operation 69 d Color P325 P330 Composition Operation 17 Media feed section Tray 2 Theory of operation Ver 1 0 Nov 2006 17 3 8 Tray open close detection control Whether tray is opened or closed is detected with the tray 2 switch 1 Closing the tray will make the detecting plate press and turn ON the actuator for the tray 2 switch mounted on the main body frame The tray 2 switch will be ON if the tray is closed 2 The switch will be OFF if the tray is pulled out and PAPER EMPTY TRAY 2 will appear d Color P325 P330
15. Check that mains voltage is as specified Connection to wrong voltage supply may result in fire or 9 electric shock Connect power plug directly into wall outlet having same configuration as the plug Use of an adapter leads to the product connecting to inadequate power supply voltage current capacity aD grounding and may result in fire or electric shock If proper wall outlet is not available advice the customer to contact qualified electrician for the installation Plug the power cord into the dedicated wall outlet with a capacity greater than the maximum power consumption 9 If excessive current flows in the wall outlet fire may result f two or more power cords can be plugged into the wall outlet the total load must not exceed the rating of the wall outlet D If excessive current flows in the wall outlet fire may result e Make sure the power cord is plugged in the wall outlet securely NN Contact problems may lead to increased resistance Q overheating and the risk of fire Check whether the product is grounded properly If current leakage occurs in an ungrounded product you may suffer electric shock while operating the product Connect power plug to grounded wall outlet 5 4 Theory of Operation Y108600 3 SAFETY AND IMPORTANT WARNING ITEMS Power Plug and Cord NWARNING When using the power cord set inlet type that came with this product make sure the connector is securely
16. Empty sensor actuator Media lift plate Media empty sensor 2 PS3 4138t02619c0 A media empty 4138t02620c0 A Longsize paper guide mechanism The media guide is used to hold a stack of long size paper loaded onto the tray 1 in place Using the media guide deletes an unwanted gap between the media empty sensor and a stack of long size paper and prevents the main body from making an incorrect media empty detection Not used Used ui i i A011T2C051DA A011T2C052DA Long size paper Media guide Empty sensor actuator A011T2C053DA A011T2C054DA Y108600 3 Theory of Operation 63 d Color P325 P330 cs e ol o Q o e 72 9 Q E e 9 16 Media feed section Tray 1 Theory of operation Ver 1 0 Nov 2006 16 3 5 Edge guide plate The edge guide plate can be slid to the exact size in the width direction of the media to be loaded No mechanism is provided for detecting a media size Edge guide plate d Color P325 P330 4138t02621c0 e on o Q o ie cs e 72 O 2 E e 9 16 3 6 Media misfeed detection control e f the registration sensor is not activated within a predetermined period of time after a media feed sequence has been started the main body determines that there is a media misfeed It then gives the message PAPER JAM TRAY on the panel The media misfeed display can be reset by opening and closing any of the doo
17. Quantity equivalent to 3000 printed pages ARBIOX 1 200eneele Standard toner cartridge Quantity equivalent to 6000 printed pages 10 APTON 2 4 00 SNESE High capacity toner cartridge Quantity equivalent to 12 000 printed for a standard original of a 5 coverage rate Approx 4 800 sheets A toner near empty condition is reset when a new toner cartridge is detected cs e on o Q o ie cs e 72 O 2 E e 9 Display example Toner near empty indication Magenta READY TONER LOW 4138F3E013DA 20 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 8 Toner supply section 8 3 7 Toner empty condition detection A Toner empty condition detection mechanism e The print unit has a toner empty condition detecting mechanism Based on the amount of toner conveyed from the toner cartridge to the print unit a toner empty condition is detected A toner level in the print unit is detected by the LED and toner level sensor mounted on the toner level sensor board provided in the main body Light emitted from the LED travels through the light guiding path and is guided into the print unit The toner level sensor detects the intensity of the transmitted light guided through the light guiding path from the inside of the toner cartridge The toner level is thereby esti mated To ensure correct detection of the intensity of transmitted light by the toner lev
18. SAFETY AND IMPORTANT WARNING ITEMS e This area generates high voltage Be careful not to touch here when the power is turned ON to avoid getting an elec tric shock Mj EUKMBM897H A iur E E at i 3t KEITA AM This area generates high n In voltage Be careful not to touch here when the power is turned ON to avoid getting an elec tric shock o A011POC506DA Y108600 3 Theory of Operation S 19 SAFETY AND IMPORTANT WARNING ITEMS A WARNING A AVVISO A AA WARNUNG A AVISO ATENCI N ATTENTION KEN Do not burn used Waste Toner Bottle Toner expelled from the fire is dangerous Do not burn used Toner Cartridge Toner expelled from the fire is dangerous A011P0C507DA A CAUTION You may be burned or injured if you touch any area that you are advised not to touch by any caution label Do not remove caution labels If any caution label has come off or soiled and therefore the caution cannot be read contact our Service Office 5 20 Theory of Operation Y108600 3 MEASURES TO TAKE IN CASE OF AN ACCIDENT MEASURES TO TAKE IN CASE OF AN ACCIDENT 1 If an accident has occurred the distributor who has been notified first must immediately take emergency measures to provide relief to affected persons and to prevent further damage 2 Ifa report of a serious accident has been received from a customer an on site evalua tion must be carried out quickly
19. eese 9 5 1 3 Transport roller slip mechanism rrnnnnnonnnnnnnnnennnnnnannnnnnnnnnnnnnnnnnnerrnrrennnnnnnn 9 5 1 4 Transport cover open close detection ssssssssseseese 10 52 S btray EE PRE EE EE i ta 11 5 2 1 Entrance S TE C 12 5 2 2 Media transport T 13 5 2 8 Media full detection usus aiit bib 3 i So a lo debe aaa pala 14 5 2 4 Finisher cover open close detection cue nene nenea naneeea eaaa 15 53 Main tray transport section m 16 5 3 1 Entrance o rM ct 17 5 3 2 Media TRANSOM RC aa 18 5 3 3 Upper exit roller up down motion mechanism sesseeseeeses 19 54 Fe Seas 20 5 4 1 Media aligning mechanism ccce nennen 20 5 4 2 Finishing tray media full detection on staple mode 22 5 4 8 Aligning belt up down mechanism eeseeseee eene 23 5 4 4 Aligning plate mechanism rannnnnnnnvvnnnnnnnnnennnnnvnrnnnnnnnnnnnennnnnnnneevnnnrnnnrnnnnn 24 5 4 5 Doe uiui aote beaten ta EEE buie items NE 25 5 4 6 Media ejector mechanism errrnnnnnannnnnannnnvnnnvnnnnneennnnnennnsnnnnnnnnnennnnenennnennr 27 5 5 Main tray PTR 28 5 5 1 Main tray ascent descent mmm nenea nenea nenea nana aaa 29 5 5 2 Media level detection mechanism rrrnnnnnnnnnvvnnnnnnnnnennnnnnnnnnnnnnnnnnnnnnnnnenn 30 Y108600 3 Theory of Operati
20. g 1 Sub tray A01FT2C024DA When media is loaded Media P A01FT2C025DA When the tray is full Ss A01FT2C026DA Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 5 Operations 5 2 4 Finisher cover open close detection e The finisher cover sensor detects the open or closed position of the finisher cover Opening the finisher cover unblocks the finisher cover sensor At this time the finisher cover sensor detects that the finisher cover is opened Staple finisher Finisher cover sensor PS3 A01FT2C027DA cs e n o Q o cs e 72 O 2 E e 9 Finisher cover sensor PS3 ES A01FT2C028DA Y108600 3 Theory of Operation 15 Staple finisher cs e on o Q o ie cs e 72 O 2 E e 9 5 Operations Theory of operation Ver 1 0 Nov 2006 5 3 Main tray transport section The main tray transport section controls drive for transporting the media from the trans port unit into the main tray and for shift and stapling operations performed on the media from the transport unit e The following describe the media transport operation for feeding media straight out into the main tray Details of shift and stapling operations will be given later in the section describing the storage section Transport motor M3 Ne
21. the idle lever thus disconnecting the drive from the main body The exit roller is driven by the reverse motor Reverse motor Idle lever Duplex option lever Exit roller 5 1 3 Reverse motor control The signal output from the AD control board is used to control rotation of the duplex reverse motor 6 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 5 Mechanical operations 5 2 Conveyance and duplex media feed mechanism 5 2 1 Conveyance and duplex media feed operation The transport motor provides the drive for the duplex option Transport roller 1 Transport motor Transport roll 1 Transport roll 2 Transport roller 2 5 2 2 Transport motor control The signal output from the AD control board is used to control the rotation of the trans port motor Y108600 3 Theory of Operation 7 Duplex option cs e ol as o Q o e 2 O 2 e 9 Duplex option cs e on o Q o e 72 O 2 E e 9 5 Mechanical operations Theory of operation Ver 1 0 Nov 2006 5 3 2 sided printing method e The following two types of 2 sided printing methods are available 2 sided printing with a single sheet of media resident in the system 2 sided printing method 2 sided printing with two sheets of media resident in the system for letter and smaller sizes 5 3 1 Proc
22. thereby allowing the fusing pressure roller and the fusing belt to recover the required temperature the fusing performance of the printed toner image is thus ensured e f a multi print cycle is run using media of a small size a difference is produced in tem perature between the center portion of the roller belt the surface over which the media moves past and the edges of the roller belt where no part of the media moves past Since the thermistor is located at the center portion the main body determines that there is a drop in roller temperature and turns ON the heater to increase the roller temperature This also heats the edges of the roller at which a high temperature is still maintained This increases the overall temperature To inhibit this situation the distance between sheets of media is widened and the tem perature of the fusing pressure roller and fusing belt is thereby made uniform d Color P325 P330 A Control start timing n an ambience of low temperature and low humidity n an ambience of high temperature and high humidity Media of a small size is detected through media width detection control See P 91 The heating roller temperature becomes lower than a predetermined level e on D Q o ie cs e 72 O 2 E e 9 B Control termination timing The control proceeds to wait control or heater OFF control during the PPM control The media that requires no PPM control
23. transport unit To prevent the toner collecting port shutter from leaving unopened after the installation of the transfer belt unit installing the waste toner box pushes the shutter lever of the toner collecting port and opens the collecting port d Color P325 P330 Unlocked Locked cs e ol as o Q o e 72 O Q E e 9 Shutter lever A011T2C035DA A011T2C036DA Y108600 3 Theory of Operation 45 14 Transfer section 2nd transfer Theory of operation Ver 1 0 Nov 2006 14 Transfer section 2nd transfer 14 1 Composition d Color P325 P330 2nd transfer roller A011T2C503AA 4138t02096c0 2nd transfer roller 2nd transfer roller Composition Operation Pre transfer guide plate Retraction A Retraction cam N A 4138t02061c0 Pressure retraction clutch 2 CL5 Retraction position sensor 2 PS1 0 4138t02048c0 46 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 14 Transfer section 2nd transfer 14 2 Drive Pressure retraction clutch 2 CL5 d Color P325 P330 Transfer belt drive roller Transfer belt drive roller Retraction cam Retraction us P position CP u sensor 2 PS10 Pressure retraction clutch 2 CL5 4138t02048c0 Retraction position sensor 2 PS10 4138t02585c0 Retraction cam cs e ol as o Q o e 2
24. 1 Rotation of the intermediate transport motor is transmitted to the drive roller of the intermediate transfer belt unit 2 Rotation of the drive roller is transmitted to the pressure retraction clutch 2 3 Whenthe pressure retraction clutch 2 is energized the rotation is transmitted to the pressure cam via a coupling gear 4 When the pressure cam turns a half turn to push up the pressure lever the 2nd transfer roller is pressed against the transfer belt 5 Atthe same time the IDC sensor lever is pushed up to open the IDC sensor cover 6 The light blocking plate fitted on the shaft of the pressure cam blocks the retraction position sensor 2 and a pressed position of the 2nd transfer roller is detected 7 When the pressure retraction clutch 2 is energized a second time the pressure cam is turned another half turn This releases the pressure lever causing the 2nd transfer roller to be retracted from the transfer belt At the same time the IDC sen sor lever is released which closes the IDC sensor cover 8 The light blocking plate unblocks the retraction position sensor 2 and a retracted position of the 2nd transfer roller is detected d Color P325 P330 2nd transfer roller dm Bm U OH S A Transfer belt CN 4138t02071c0 drive roller Composition Operation Retraction lever Retraction Pressure retraction cam e swe clutch 2 CL5 4138t02063c0 When retracted 2nd transfer roller Retraction lever
25. 1 0 Nov 2006 4 Operations 4 1 9 Media size detection control The media size switch detects the length size FD of the media 1 The size detection board turns as the trailing edge guide plate is moved 2 When the tray is slid into the main body the size detection board pushes the actua tor of the media size switch installed to the main body frame thus turning ON the switch 3 The combination of ON OFF positions of the sub switches of the media size switch determines the specific media size that can be either one of the seven different sizes 4 lf the tray is not slid into position all of the sub switches are OFF and the message OUTPUT FULL REMOVE PAPER MAIN TRAY appears Lower feeder unit Lower feeder media size switch Media size SW1 SW2 SW3 Lower feeder unit not installed Media size switch MS2 Composition Operation Actuator Size detection board Trailing edge guide plate 4138t02122c0 Y108600 3 Theory of Operation 9 Lower feeder unit e ol n o Q o e 72 O 2 E e 9 4 Operations Theory of operation Ver 1 0 Nov 2006 4 1 10 Media reference position adjustment mechanism The edge guide plate can be moved to allow the print start reference position for the media to be adjusted 1 Through a hole in the media lift plate on top of the tray loosen two screws that secure the edge guide plate 2 Accessing the tray from its bottom
26. 2006 YES GO e211 019 eee ee TT 66 17 3 1 Media lift plate mechanism cioc ocave aia oale act nat a a ni dn 66 17 3 2 Media separation MECHANISM ccceeeee cece eee nana aere 67 17 3 3 Media feed control P 67 17 3 4 Media supply level detection control 68 17 3 5 Media empty condition detection control esesseeeeeseeesse 68 17 3 6 Edge guide pl tesc iei ceea irri ieu mede seda pad aa daia tip a la 69 17 3 7 Trailing edge guide plate mea e ae pe e be eria 69 17 3 8 Tray open close detection control ceennnnee eee eee 70 17 3 9 Media misfeed detection control xxrrrrnnnnnnnnvvnnnnnnnnennnnnnnnnrnnnnnnnnnnennnnnnne 70 18 Conveyance section IDC sensor nenea nenea nana 71 18 1 COmMPOS ON m r P 71 B L eee 72 18 2 6 ERE mene eenan ease 72 18 2 1 Toner density detection control eee nana eee 72 18 2 2 IDC sensor calibration control mmn eee nenea nana 73 18 2 3 IDC sensor shutter mechanism rarsrnvrrnnnnnrnnnrrnnnennnnnrrnnnrrnnnnrrnennrrrnnrnnennn 73 19 Conveyance section Registration roller esee 74 19 1 ener EE EE oad ease 74 192 Mee 74 19 3 PM 5 19 3 1 Conveyance speed control LS 75 19 3 2 Registration roller control eee mean nneeeeeeaee 75 19 3 3 Control of loop formed before registration roller sssssss 76 19 3 4 Control of loop for
27. A Media detection control e When the media fed from the feed roller pushes up the actuator of the registration sen sor the sensor is unblocked With this event occurring the main body determines that the media has reached the position before the registration roller Registration roller M Media fed from duplex Actuator S Registration sensor PS4 cid 4138t02099c0 Media from tray 1 2 3 Y108600 3 Theory of Operation 75 d Color P325 P330 e on o Q o ie cs e 72 Q E e 9 19 Conveyance section Registration roller Theory of operation Ver 1 0 Nov 2006 19 3 3 Control of loop formed before registration roller Media conveyance is stopped after the lapse of a predetermined period of time after the leading edge of the media fed from the feed roller has reached the registration roller This forms a loop in the media The loop in the media corrects skew in the media Registration roller Media 4138t02100c0 A Media conveyance temporary stop control Media conveyance stop A given period of time after the registration sensor has detected the leading edge of the media media conveyance in the media feed conveyance section is stopped e Restart Media conveyance in the media feed transport section is restarted in synchronism with the sub scan print start signal TOD of the controller Media feed section media conveyance Transport section
28. Conditions enabling shift to warm up control The power switch is turned ON e A malfunction or media misfeed is reset e The main body leaves the power save mode A door is closed B Condition enabling shift to post warm up control e Atthe end of the warm up control no print request C Conditions enabling shift to wait control Atthe end of the warm up control no print request e Atthe end of the post print cycle control e Atthe end of a proactive control D Condition enabling shift to the proactive control A print request is accepted E Condition enabling shift to print control A print request is accepted F Condition enabling shift to post print cycle control e At the end of the print control 94 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 20 Fusing section G Condition enabling shift to heater OFF control e A malfunction or media misfeed occurs A power save mode signal is received 20 3 5 Warm up control d Color P325 P330 Control is provided until the heating roller reaches the predetermined level The power save mode is not accepted during a warm up cycle A Control start timing The power switch is turned ON e A malfunction or media misfeed is reset e The main body leaves the power save mode A door is closed B Control termination timing e The heating roller reaches a predetermined temperature e A malfunction or media misfeed is reset A door i
29. Media level sensor 1 PS9 o Media level sensor 2 PS10 j Media level lever solenoid SL2 Media ejector motor M1 e o Q o e 72 9 Q E e 9 1 U Set 3 ad m fr 3 Paddle solenoid SL4 Media ejector motor M1 AO1FT2C049DA AO01FT2C050DA Media level sensor 1 PS9 Media level sensor 2 PS10 Media level lever solenoid SL2 A01FT2C051DA Y108600 3 Theory of Operation 25 5 Operations Theory of operation Ver 1 0 Nov 2006 A Operation NOTE The following describe the operation in the shift mode The operation in the sta pling mode basically follows the same steps with some performed in different orders Staple finisher 1 When the media aligning sequence is completed the aligning belt up down solenoid is energized so that the aligning belt is raised 2 The media ejector motor starts rotat ing so that the media ejector trans ports the media up to the exit roller Media ejector motor M1 3 The media level lever solenoid is energized to retract the media level lever 4 The paddle solenoid is energized to rotate the paddle The paddle feeds the media out into the main tray 5 The media ejector motor is rotated backward to move the media ejector toward its home position Composition Operation Media level lever Media level lever solenoid SL2 N A01FT2C053DA
30. and KMBT must be notified 3 To determine the cause of the accident conditions and materials must be recorded through direct on site checks in accordance with instructions issued by KMBT 4 For reports and measures concerning serious accidents follow the regulations speci fied by every distributor Y108600 3 Theory of Operation S 21 MEASURES TO TAKE IN CASE OF AN ACCIDENT Blank Page S 22 Theory of Operation Y108600 3 Composition of the service manual This service manual consists of Theory of Operation section and Field Service section to explain the main machine and its corresponding options Theory of Operation section gives as information for the CE to get a full understanding of the product a rough outline of the object and role of each function the relationship between the electrical system and the mechanical system and the timing of operation of each part Field Service section gives as information required by the CE at the site or at the cus tomers premise a rough outline of the service schedule and its details maintenance steps the object and role of each adjustment error codes and supplementary information The basic configuration of each section is as follows However some options may not be applied to the following configuration Theory of Operation section OUTLINE Explanation of system configuration product specifications unit configuration and paper path COMPOSITION OPERATION Explanation
31. and the aligning belt then feed the media onto the main tray Exit roller e on o Q o ie cs e 72 fe Q E e 9 Media A01FT2C032DA 18 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 5 Operations 5 3 3 Upper exit roller up down motion mechanism The upper exit roller is lowered when the media is fed straight into the main tray or stored in the finishing tray When a printed media stack set is fed out the upper exit roller is raised to be away from the lower exit roller so that there is an unblocked media path between the upper and lower exit rollers The upper exit roller is pressed against or separated from the lower exit roller by the drive provided by the exit roller up down motor The exit roller sensor detects the position of the exit roller Exit roller up down motor M5 PETE Pressed Separated Exit roller AO1FT2C034DA AO1FT2CO35DA Exit roller sensor PS8 Pressed Separated A01FT2C036DA A01FT2C037DA Y108600 3 Theory of Operation 19 Staple finisher cs e ol o Q o e 72 9 Q E e 9 5 Operations Theory of operation Ver 1 0 Nov 2006 5 4 Storage section 5 4 1 Media aligning mechanism The printed media stack set is aligned and stapled together in the storage section before being fed out into the main tray The storage section sensor detects me
32. collecting section 15 3 5 Waste Toner Box locking mechanism e When the box lock lever is in the unlocked position the 12 o clock position the protru sion provided at the toner collecting port interferes with the main body frame thus pre venting the waste toner box from being removed When the box lock lever is in the locked position the 9 o clock position the waste toner box can be removed d Color P325 P330 Box lock lever Locked Collecting port Protrusion A011T2C045DA 15 3 6 Waste toner box locked position detection mechanism When the box lock lever is in the locked position the 9 o clock position the protrusion provided in the front door interferes with the box lock lever As a result the front door cannot be closed When the box lock lever is in the unlocked position the 12 o clock position the front door can be closed cs e ol as o Q o e 2 O 2 e 9 Lock Unlock 2 A011T2C046DA Y108600 3 Theory
33. incorrect color registration that occurs due to varia simplified control tions in parts of the main body used for regulating different See P 14 drawing positions 104 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 21 Image stabilization control 21 1 4 Image stabilization control execution request Arequest for execution of the complete correction control simplified correction control or individual registration control is made at the following timing Stabilization request detection timing Execution processing Stabilization request timing d Color P325 P330 When a new IU is detected Upon When a other used IU is replace detected ment of unit When the transfer belt unit is When the front right door is Complete correction replaced closed control When the power switch is Power the switch is turned Depending on each condi turned ON ON tion When there is a great change Power the switch is turned in environmental conditions ON When the front right door from those when the last sta is closed At the end of a job bilization sequence was exe When the sleep mode is cuted deactivated When the power switch is Complete correction turned ON control Complete correction control By main When the front right door is body status When there is a temperature closed At the end of a job dur individual registration con change inside the PH unit ing a job When the slee
34. ing the period of time that begins when a near life condition is detected and ends when a life condition is detected e The near life display function can be disabled through System menu Warning detection I unit near life Initial setting Display When the photo conductor driving time reaches its life time the life warning message d Color P325 P330 appears Display example Display example Print unit near life indication Magenta Print unit life indication Magenta READY READY I UNIT LOW I UNIT LIFE cs e on o Q o ie cs e 72 O 2 E e 9 A011T2E073DA A011T2E074DA e f the photo conductor runs more than its life a life end warning message appears When the warning message appears you cannot print e The life end message can be reset when the print unit is replaced Display example Display example Print unit life end indication Magenta Print unit life end indication Magenta Print jobs waiting to be printed Receiving a print job READY A UNIT END I UNIT END REPLACE M 7 for help A011T2E075DA A011T2E076DA 9 2 2 Print unit life control e Each print unit is provided with a PU detection board that detects state of a toner car tridge placement a new PU a print unit life e The main body attempts to perform a detection sequence when the front door is closed e When a cartridge is detected as a new one an image stabilization sequence starts 24 T
35. inserted in the inlet of the product When securing measure is provided secure the cord with the fixture properly If the power cord inlet type is not connected to the prod uct securely a contact problem may lead to increased resistance overheating and risk of fire Check whether the power cord is not stepped on or pinched by a table and so on Overheating may occur there leading to a risk of fire Check whether the power cord is damaged Check whether the sheath is damaged If the power plug cord or sheath is damaged replace with a new power cord with plug and connector on each end specified by KMBT Using the damaged power cord may result in fire or electric shock e Do not bundle or tie the power cord Overheating may occur there leading to a risk of fire Check whether dust is collected around the power plug and wall outlet Using the power plug and wall outlet without removing dust may result in fire Do not insert the power plug into the wall outlet with a wet hand The risk of electric shock exists e When unplugging the power cord grasp the plug not the cable The cable may be broken leading to a risk of fire and electric shock Y108600 3 Theory of Operation Q 5 5 SAFETY AND IMPORTANT WARNING ITEMS Never use multi plug adapters to plug multiple power cords in the same outlet If used the risk of fire exists e When an extension cord is required
36. is transmitted through the media feed clutch 2 to turn the feed roller e The feed roller rotates to take up and feed media into the main body Double feeding of media is prevented by the separation roller provided with a torque lim iter d Color P325 P330 Intermediate transport motor M3 i Feed roller Feed roller Separation roller 4138t02058c0 4138t02089c0 17 3 3 Media feed control Drive from the intermediate transport motor is transmitted through the media feed clutch 2 to turn the feed roller thereby taking up and feeding the media The media taken up and fed in is conveyed onto the registration roller The media is pressed against the stationary registration roller so that a loop is formed in the media The feed roller is then stopped The loop thus formed in the media corrects any mechanical skew in the media The registration roller is started Registration roller clutch CL2 in synchronism with the sub scan print start signal TOD of the controller to convey the media e At the same time that the registration roller is started Registration roller clutch CL2 the feed roller is started again so that the media is conveyed further this is done to reduce load otherwise placed on the media feed section when the media is conveyed As the trailing edge of the media reaches a point immediately before the feed roller the feed roller is stopped cs e ol as o Q o
37. low speed When the media loop length is small the actuator of the media loop sensor is pushed up a small amount and the sensor is unblocked When the sensor is unblocked the fusing speed is decelerated 3 For the second side in the duplex mode the speed decreases by 1 0 D Fusing acceleration high speed e When the media loop length is large the actuator of the media loop sensor is pushed up a large amount and the sensor is blocked When the sensor is blocked the fusing speed is accelerated 3 For the second side in the duplex mode the speed increases by 1 5 cs e ol as o Q o e 72 O 2 e 9 Fusing deceleration Fusing acceleration Fusing pressure roller 4138t02069c2 2nd transfer roller 4138t02069c1 Media loop sensor PS6 Y108600 3 Theory of Operation 89 d Color P325 P330 e on o Q o ie cs e 72 O 2 E e 9 20 Fusing section Theory of operation Ver 1 0 Nov 2006 E Fusing pressure roller deformation prevention control To prevent the fusing pressure roller from being deformed the fusing pressure roller is forcibly turned if it is left idle for a predetermined period of time Operation timing 1 If the main body remains in the standby state for more than 13 hours the fusing motor is turned for 1 sec 2 If the main body remains in the power save mode for more than 14 days the tem perature adjustment
38. manual technical notices etc and proceed with the inspection following the prescribed pro cedure in safety clothes using only the prescribed tools Do not make any adjustment not described in the docu ab mentation If the prescribed procedure or tool is not used the prod uct may break and a risk of injury or fire exists Before conducting an inspection be sure to disconnect the power plugs from the product and options When the power plug is inserted in the wall outlet some units are still powered even if the POWER switch is turned OFF A risk of electric shock exists The area around the fixing unit is hot You may get burnt Y108600 3 Theory of Operation S 7 SAFETY AND IMPORTANT WARNING ITEMS Take every care when making adjustments or performing an operation check with the product powered If you make adjustments or perform an operation check with the external cover detached you may touch live or high voltage parts or you may be caught in moving gears or the timing belt leading to a risk of injury e Take every care when servicing with the external cover detached High voltage exists around the drum unit A risk of elec AN tric shock exists Safety Checkpoints Check the exterior and frame for edges burrs and other damage The user or CE may be injured Do not allow any metal parts such as clips staples and screws to fall into the product or fire Check wiring
39. media is loaded in position The media lift plate lock lever will be pressed to the feed roller The media feed clutch will rotate the feed roller to activate the lock release lever pressed to the feed roller and the media lift plate will be unlocked The media lift plate media stack is pressed against the feed roller The media lift plate media stack is pressed upward by the springs at all times cs e ol as o Q o e 2 O 2 e 9 Feed roller LOCK POSITION Media lift plate Media lift plate lock lever LOCK RELEASE POSITION 4138t02617c0 Y108600 3 Theory of Operation 61 16 Media feed section Tray 1 Theory of operation Ver 1 0 Nov 2006 16 3 2 Media separation mechanism Drive from the intermediate transport motor is transmitted through the media feed clutch 1 to turn the feed roller The feed roller rotates to take up and feed media into the main body Double feeding of media is prevented by the separation roller provided with a torque lim iter d Color P325 P330 Intermediate transport motor M3 Feed roller Or Oe Separation roller 4138T2C002DB 4138t02618c0 16 3 3 Media feed control Drive from the intermediate transport motor is transmitted through the media feed clutch 1 to turn the feed roller thereby taking up and feeding the media The media taken up and fed in is conveyed onto the registration
40. media size sensor PS15 I g PS15 O p gt or d 9 cs e ol o Q o e 72 9 Q E e 9 SV Exit sensor PS8 NIDA SF A Thermistor 2 ui TH2 y Fusing pad Fusing belt Thermostat 1 TS1 Fusing heater lamp 2 Thermistor 1 TH1 4 E JR FH2 Fusing pressure rolle Heating roller Thermostat 2 TS2 Fusing heater lamp 1 FH1 A011T2C513AA Y108600 3 Theory of Operation 85 d Color P325 P330 e n o Q o e 72 O 2 E e 9 20 Fusing section Theory of operation Ver 1 0 Nov 2006 20 2 Drive Exit roller Fusing belt Heating roller Fusing motor M4 Fusing pressure roller Fusing belt 4138t02068c0 Media exit roller 4138t02074c0 86 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 20 Fusing section 20 3 Operation 20 3 1 Fusing pressure roller pressure selection mechanism The pressure applied by the fusing pressure roller is selected appropriately to prevent media wrinkles during printing of envelopes A pressure selection mechanism is provided to vary the pressure in two steps The pressure is selected by placing the pressure selector dial in either of the two posi tions that are 180 degrees apart from each other Placing the dial in the appropriate position selects the correspondi
41. name Purpose To check the low gain output value and offset voltage value of 1 IDC sensor offset value check the IDC sensor when the shutter is closed To check the low gain output value of the IDC sensor using IDC sensor reflection output the intensity value set last for the clear transfer belt surface on which no toner sticks 3 Developing bias control simplified To determine whether there is a leak based on the measure Vpp check ment value taken last 4 d Color P325 P330 Developing bias duty control control of the maximum amount of toner sticking to the transfer belt To correct the amount of toner based on the measurement value taken last Laser light intensity control simplified correction control To correct based on the measurement value taken last See P 14 To correct incorrect color registration that occurs due to varia tions in parts of the main body used for regulating different drawing positions The simplified control uses a simplified registration pattern to make the correction Registration correction control simplified control See P 14 21 1 3 Individual registration control e on o Q o ie cs e 72 Q E e 9 Control name Purpose To check the low gain output value of the IDC sensor using IDC sensor reflection output the intensity value set last for the clear transfer belt surface on which no toner sticks Registration correction control To correct
42. of Operation 57 15 Waste toner collecting section Theory of operation Ver 1 0 Nov 2006 15 3 7 Waste toner box in position detection mechanism The waste toner box set detection lever is provided to detect a waste toner box loaded in position When the waste toner box is not loaded the set detection lever lowers by its own weight to plug the set detection window The protrusion provided in the front door interferes with the set detection lever that plugs the set detection window Then the front door cannot be closed e When the waste toner box is loaded in position it pushes up the set detection lever to uncover the set detection window d Color P325 P330 Setdetection Set detection lever window A011T2C047DA 15 3 8 Waste toner flow in the waste toner box e on o Q o e 72 2 E e 9 1 Toner conveyed to the toner collecting port is conveyed to the 2nd conveyance screw by the 1st conveyance screw provided in the waste toner box he toner is conveyed into the waste toner box by the 2nd conveyance screw 2 In order for waste toner to be accumulated from the left side the waste toner b
43. of the main body the image of the sixth page of the print job is printed on the third sheet of media e Steps 6 through 7 are repeated until all pages of the job are printed Y108600 3 Theory of Operation 5 Mechanical operations 4538t02515c1 4538t02508c1 4538t02509c1 11 Duplex option cs e ol n o Q o e 2 O 2 E e 9 5 Mechanical operations Theory of operation Ver 1 0 Nov 2006 Duplex option e n o Q o cs e 72 O 2 E e 9 Blank Page 12 Theory of Operation Y108600 3 Color Printer Lower Feeder Unit THEORY OF OPERATION Code Y108600 3 Revision history After publication of this service manual the parts and mechanism may be subject to change for improvement of their performance Therefore the descriptions given in this service manual may not coincide with the actual machine When any change has been made to the descriptions in the service manual a revised version will be issued with a revision mark added as required Revision mark To indicate clearly a section revised show to the left of the revised section A number within AA represents the number of times the revision has been made To indicate clearly a section
44. of the developing unit driving time involved with 2P J is one printed page time Y108600 3 Theory of Operation 105 21 Image stabilization control Theory of operation Ver 1 0 Nov 2006 21 1 6 Combination and execution sequence of different sub controls Simplified Complete individual Control name image image registration stabilization stabilization control IDC sensor calibration control See P 73 Correction d Color P325 P330 IDC sensor reflection Check output Developing bias Vpp control Full adjustment Developing bias duty con Fine adjustment trol control of the maxi mum amount of toner Full adjustment sticking to the transfer belt Laser light intensity control Fine adjustment See P 14 Full adjustment Full adjustment Gamma characteristics Full adjustment detection control Registration correction Fine Fine adjustment control See P14 Full adjustment Composition Operation 106 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 22 Miscellaneous 22 Miscellaneous 22 1 Fan control 22 1 1 Composition Fusing fan motor FM2 d Color P325 P330 DC power supply fan motor FM1 DC power supply fan motor FM1 Fusing fan motor FM2 4138t02111c0 Ozone ventilation fan motor FM3 Ozone ventilation fan motor FM3 A011T2C058DA 22 1 2 Function A Fusing fan motor Fusing fan
45. or more storage capacity are supported Microdrive is not supported o e e a LG N eo oO 9 o Q o 1 Folded double postcards cannot be used Lower feeder unit Only plain paper and recycled paper weighing 60 to 90 g m 16 to 24 Ib can be loaded Duplex option Only plain paper and recycled paper weighing 60 to 90 g m 16 to 24 Ib can be fed through the unit For details see the Service Manual for each option C Maintenance Machine durability 400 000 prints or 5 years whichever comes first D Machine specifications Power requirements AC 110 to 127 V 10 6 AC 120 V 10 10 onry US Canada Voltage AC 220 to 240 V 10 10 Frequency 50 to 60 Hz 3 Hz UR 1400 W or less Dimensions 420 mm W x 526 mm D x 420 mm H 16 5 inch W x 20 7 inch D x 16 5 inch H Weight 32 4 kg 71 4 Ib or less without consumables Operating noise During standby 39 dB A or less During printing 56 dB A or less E Operating Environment Temperature 10 to 35 C 50 to 95 F with a fluctuation of 10 C 18 F or less per hour Humidity 15 to 85 with a fluctuation of 20 h NOTE These specifications are subject to change without notice 4 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 3 Section configuration 3 Section configuration Toner supply section Fusing section Print unit section Y108600 3 Theory of Operation Media fe
46. predetermined period of time elapses after a warm up cycle is completed Atthe end of a print cycle During when the image stabilization control is performed During the power save mode The motor is not however stopped for a predetermined period of time after a predrive is complete Forced stop condition e A malfunction occurs but not when an error occurs cs e ol as o Q o e 2 O 2 e 9 Y108600 3 Theory of Operation 109 22 Miscellaneous Theory of operation Ver 1 0 Nov 2006 d Color P325 P330 e n o Q o e 72 O 2 E e 9 Blank Page 110 Theory of Operation Y108600 3 Color Printer Duplex Option THEORY OF OPERATION Code Y108600 3 Revision history After publication of this service manual the parts and mechanism may be subject to change for improvement of their performance Therefore the descriptions given in this service manual may not coincide with the actual machine When any change has been made to the descriptions in the service manual a revised version will be issued with a revision mark added as required Revision mark To indicate clearly a section revised show to the left of the revised section A number within AA represents the number of times the revision has been made To indicate clearly a section revised show A in the lower outside section of the correspond ing page A number within A repres
47. revised show A in the lower outside section of the correspond ing page A number within A represents the number of times the revision has been made NOTE Revision marks shown in a page are restricted only to the latest ones with the old ones deleted When a page revised in Ver 2 0 has been changed in Ver 3 0 The revision marks for Ver 3 0 only are shown with those for Ver 2 0 deleted When a page revised in Ver 2 0 has not been changed in Ver 3 0 The revision marks for Ver 2 0 are left as they are Theory of operation Ver 1 0 Nov 2006 CONTENTS Lower feeder unit 3 Outline Prod ct PAN 1 Composition Operation 2 usc LEGII 016 1 eg EEE EE 3 3 BEC 4 4 sept HY 4 4 1 Media feed control c M 4 4 1 1 Media lift plate mechanism mmmnnnnne nenea mean 4 B 4 1 2 Feed roller vertical transport roller control sesssseese 5 4 1 3 Media separation mechanism rrannnnnnnnnnvnnnvnnnnnevnnnvnnnnnnnnnnnnnnennnennnneevnnnnnn 6 amp 4 1 4 Media detection mechanism sacosa aa a ae oaie ae ati abia nn 6 E 4 1 5 Media supply level detection control ssesseeseeeee 7 H 4 1 6 Media empty condition detection control rrnnrnnnnnnnnnnnnnnnnnnnnnnnrrrrnnnnnnnnennnnn 7 5 4 1 7 Edge guide PNG 8 4 1 8 Trailing edge guide plate m ni soia ie aaa eines sansele t ih vin asa odata aa 8 4 1 9 Media size Jeeves 9 4 1 10 Medi
48. roller The media is pressed against the stationary registration roller so that a loop is formed in the media The feed roller is then stopped The loop thus formed in the media corrects any mechanical skew in the media The registration roller is started Registration roller clutch CL2 in synchronism with the sub scan print start signal TOD of the controller to convey the media Atthe same time that the registration roller is started Registration roller clutch CL2 the feed roller is started again so that the media is conveyed further this is done to reduce load otherwise placed on the media feed section when the media is conveyed As the trailing edge of the media reaches a point immediately before the feed roller the feed roller is stopped cs e n o Q o e 72 O 2 E e 9 Intermediate transport motor M3 Media feed clutch 2 CL3 Registration sensor PS4 Registration roller clutch CL2 Sub scan print start signal TOD A011T2bE066DA 62 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 16 Media feed section Tray 1 16 3 4 Media empty condition detection control e A media empty condition is detected when the empty sensor actuator unblocks the media empty sensor 2 e No mechanism is provided for detecting a media near empty condition The media sup ply level indicator serves this purpose When media Media is loaded
49. second Full color mode A4S Letter 1 sided mode plain paper d Color P330 Full color mode 27 0 pages min 25 6 pages min Monochrome mode 31 7 pages min 30 0 pages min Letter 1 sided print plain paper AAS 1 sided print plain paper Letter 1 sided print plain paper AAS 1 sided print plain paper d Color P330 Full color mode 31 7 pages min Letter 1 sided print plain paper 30 0 pages min A4S 1 sided print plain paper Monochrome mode 37 0 pages min Letter 1 sided print plain paper 35 0 pages min A4S 1 sided print plain paper Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 2 Product specifications Media sizes Media types Tray capacities Interfaces CPU Y108600 3 Tray 1 Standard size SEF only Legal Letter Government Letter Statement Executive Folio SP Folio UK Quatro Foolscap Government Legal e AAS B5 B5 ISO A5 A6 B6 Photo size 16K Kai16 Kai32 Envelope Com10 C5 C6 DL Monarch Youkei 4 Youkei 4 Choukei 3 Youkei 0 Choukei 4 Postcard Japanese postcard Double postcard Custom size Minimum size 92 mm x 148 mm 3 6 inch x 5 8 inch Maximum size 218 mm x 356 mm 8 6 inch x 14 0 inch Long size paper 357 mm to 1 200 mm 14 0 inch x 47 2 inch 1 sided mode only Tray 2 A4S LetterS Tray 1 e Plain paper 60 to 90 g m 16 to 24 Ib e Recycled paper 60 to 90 g m 16 to 24 I
50. size detection results are used in the PPM control to be described later See P 100 d Color P325 P330 Fusing media size sensor PS15 cs e ol as o Q o e 2 O 2 e 9 4138t02107c0 Y108600 3 Theory of Operation 91 d Color P325 P330 e on D Q o ie cs e 72 O 2 E e 9 20 Fusing section Theory of operation Ver 1 0 Nov 2006 H Detection of media full in the exit tray The media full sensor detects the load capacity of output media in the exit tray When the media holding plate is low the edge of the media holding plate shades the media full sensor When printing starts the output media pushes up the media holding plate and the edge of the plate activates the media full sensor e After all media is discharged the media holding plate goes down and the edge of the plate shades the media full sensor If the sensor is shaded the printed media is judged to not have reached the maximum load capacity yet After all media is discharged if the output media in the exit tray keeps the media holding plate up and the media full sensor remains activated the printed media is judged to have reached the maximum load capacity and the operation panel displays the message OUTPUT FULL REMOVE PAPER e f the sensor detects that the exit tray is full printing is stopped The message OUTPUT FULL REMOVE PAPER is removed when the output m
51. started with the target temperature of the fusing heater lamp 2 set at 150 C 3 Ifa predetermined period of time elapses after the postwarm up control has been started or if the fusing pressure roller and the fusing belt temperatures reach the specified levels the control proceeds to wait control 20 3 7 Wait control Control is provided to ensure that the temperatures at different parts of the fusing unit reach a constant level during the wait state A Control start timing Atthe end of the post warm up control e Atthe end of the post print cycle control print start control Atthe end of the proactive control B Control termination timing A print request is received e A malfunction or media misfeed occurs A power save mode signal is received C Control operation timing 1 The temperature adjustment is started with the target temperature of the fusing heater lamp 1 set at 170 C correction value At the same time the temperature adjustment is started with the target temperature of the fusing heater lamp 2 set at 150 C 2 Ifa print request is received during the wait state the control proceeds to print control 3 Ifa malfunction or media misfeed occurs or a power save request is made during the wait state the control proceeds to heater OFF control Y108600 3 Theory of Operation 97 d Color P325 P330 cs e ol as o Q o e 2 O 2 e 9 20 Fu
52. the feeding direction it is called short edge feeding The feeding direction which is perpendicular to the short edge feeding is called the long edge feeding e Short edge feeding will be identified with S abbreviation for Short edge feeding on the paper size No specific notation is added for the long edge feeding When the size has only the short edge feeding with no long edge feeding S will not be added to the paper size Sample notation Paper size Feeding direction Long edge feedin AA g eag g A4 Short edge feeding C 2 Theory of Operation Y108600 3 Color Printer d Color P325 d Color P330 THEORY OF OPERATION Code Y108600 3 Revision history After publication of this service manual the parts and mechanism may be subject to change for improvement of their performance Therefore the descriptions given in this service manual may not coincide with the actual machine When any change has been made to the descriptions in the service manual a revised version will be issued with a revision mark added as required Revision mark To indicate clearly a section revised show to the left of the revised section A number within AA represents the number of times the revision has been made To indicate clearly a section revised show A in the lower outside section of the correspond ing page A number within A represents the number of times the revision has been made NOTE Revision marks shown in a page
53. 2 O 2 e 9 Developing M Developing C Developing K TOD Y TODM TODC TODK 1st transfer pressure retraction 1st transfer rem 2nd transfer pressure retraction 2nd transfer rem 2nd transfer First page 2nd page E A011T2E061DA Y108600 3 Theory of Operation 9 d Color P325 P330 e on o Q o e 72 O 2 E e 9 6 Overall composition Theory of operation Ver 1 0 Nov 2006 6 2 Control block diagram Operation board OB Print control board PRCB MFP board MFPB Media feed and mage a processing CPU er ere Leser drive board LASDB TC Y TC M TC C TC K PU Y PU M PU C PU K e Control system line Staple finisher Lower feeder unit Duplex unit A011T2E062DA 10 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 7 Write section 7 Write section 7T 1 Composition d Color P325 P330 A011T2C500AA 4138t02001c0 Separation mirror c e o Q o e 72 9 Q E e 9 Return mirror 1st Index board G1 lens Semiconductor laser Y108600 3 Theory of Operation 11 7 Write section Theory of operation Ver 1 0 Nov 2006 7 2 Operation 7 2 1 Overview Four semiconductor lasers provided one for each of the four different colors A single polygon motor is used to make a scan motion e Each photo co
54. 2 000 printed pages d Color P325 P330 8 3 2 Toner conveying mechanism The toner supply motor is turned either forward or backward to drive the agitating blade and the conveyance screw The agitating blade provided in the toner cartridge agitates and conveys toner to the con veyance screw The toner conveyed by the agitating blade is conveyed to the toner collecting port sitting on the front side of the main body by the conveyance screw LE LE DD LE LEJ LJ EE m A011T2C006DA Toner collecting port Agitating blade Conveyance screw ar cs e ol as o Q o e 72 O 2 e 9 Rear side Agitating blade Conveyance screw A011T2C007DA A011T2C009DA Y108600 3 Theory of Operation 17 d Color P325 P330 e ol o Q o ie cs e 72 O 2 E e 9 8 Toner supply section Theory of operation Ver 1 0 Nov 2006 8 3 3 Toner collecting port shutter mechanism 18 The toner collecting port is equipped with a shutter mechanism that prevents toner from being spilled out when the toner cartridge is removed from the main body After installing the toner cartridge into the main body placing the print unit release lever in its locked position opens the shutter of the toner collecting port Then
55. 25 P330 cs e on o Q o ie cs e 72 O 2 E e 9 11 Print unit section charge corona Theory of operation Ver 1 0 Nov 2006 11 2 4 Ozone ventilation mechanism Ozone stagnant in areas near the charge corona unit reduces sensitivity of the photo conductor causing white bands to occur in the image The ozone filter is used to remove ozone produced by the charge corona unit thereby preventing sensitivity of the photo conductor surface from being degraded The urethane rubber affixed to the side face of the charge corona unit is brought into contact the photo conductor which makes the charge corona unit in tight contact with the photo conductor Outside air is drawn in through the opening provided at the front end of the charge corona unit and is discharged together with ozone through the opening provided in the rear The ozone ventilation fan motor located in the rear of the main body draws air to allow the discharged ozone to be removed by the ozone filter The ozone ventilation fan motor is kept energized for 3 min after the print cycle has been completed The ozone ventilation fan motor also functions to cool down the print head Ozone filter Ozone ventilation fan motor FM3 4138t02021c0 30 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 12 Print unit section developing 12 Print unit section developing 12 1 Composition Replenishing s
56. 3 Theory of Operation 1 o e e A tol Q eo Aa _ 2 o Q o 2 Product specifications Theory of operation Ver 1 0 Nov 2006 2 Product specifications A Type Type Printing system Exposure system Desktop tandem full color laser beam printer Semiconductor laser and electrostatic image transfer to media 4 laser diode and polygon mirror PC drum type OPC organic photo conductor Photoconductor Blade cleaning system cleaning Print resolution Media feeding system 600 dpi x 600 dpi x 4 bit Two way system Tray 1 100 sheets Tray 2 500 sheets Expandable up to a four way system by adding lower feeder units up to two Developing system Charging system Image transfer system Media separating system Fusing system Media exit system B Functions Warm up time Process speed First page out time Print speed Single element developing system Needle charging system with ozone suctionfeature Intermediate transfer belt system Curvature separation charge neutralizing system Belt fusing Face down Output tray capacity A4S Letter 250 sheets Average 45 sec or less Power on to ready at ambient temperature of 23 C 73 4 F and rated source voltage d Color P325 152 mm sec plain paper full color mode d Color P330 185 mm sec plain paper full color mode d Color P325 14 2 second Full color mode A4S Letter 1 sided mode plain paper d Color P330 14 0
57. 4138t02064c0 41382070c0 Retraction cam 48 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 14 Transfer section 2nd transfer D Pressure retraction operation e e Retraction position sensor 2 PS10 a blocked re Retraction position sensor 2 PS10 amp unblocked o Q 18 2nd transfer roller pressed 2nd transfer roller retracted IDC sensor cover open IDC sensor cover closed e o 360 4138t02586c0 Pressure cam angle C 413810258501 419810258502 413810258561 Retracted Pressed Retracted 14 3 2 2nd transfer roller pressure position deviation preventive mechanism e When the right door is opened and closed the pressure cam is rotated to prevent the 2nd transfer roller from deviating from the pressure position cs e ol n o Q o cs e 72 O 2 E e 9 A Operation The lever moves up or down as the right door is opened or closed thereby locking rota tion of the coupling gear that drives the pressure cam When the right door is closed When the right door is opened Right door open close lever Pressure cam Y108600 3 Theory of Operation 49 14 Transfer section 2nd transfer Theory of operation Ver 1 0 Nov 2006 14 3 3 2nd transfer voltage control The transfer voltage is applied to the 2nd transfer roller in order to transfer the toner image from the transfer belt to the media The transfer v
58. 9 Conveyance section Registration roller Theory of operation Ver 1 0 Nov 2006 19 3 5 Control of loop formed before fusing section The difference between the fusing speed and media conveyance speed is corrected to prevent double transferred images and brush effects from occurring The media loop sensor detects the length of the loop formed in the media between the 2nd transfer roller and the fusing pressure roller The fusing speed is then varied accord ing to the length of the loop detected By varying the fusing speed any effects from the fusing pressure roller side part to part variations change of parts over time are pre vented from being transferred to the 2nd transfer section e No loop control is provided to perform the fusing process when envelopes are used to prevent wrinkles See P 89 d Color P325 P330 A Fusing deceleration low speed e When the media loop length is small the actuator of the media loop sensor is pushed up a small amount and the sensor is unblocked When the sensor is unblocked the fusing speed is decelerated 3 For the second side in the duplex mode the speed decreases by 1 0 B Fusing acceleration high speed When the media loop length is large the actuator of the media loop sensor is pushed up a large amount and the sensor is blocked When the sensor is blocked the fusing speed is accelerated 396 For the second side in the duplex mode the speed increases by 1 5
59. 96 Temperature control Temperature control Heating roller Fusin pressure roller Warm up start Fusing unit rollers Fusing ready and belt start A011T2E072DA Warm up cycle control diagram during ordinary start Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 20 Fusing section 20 3 6 Post warm up control After the warm up cycle has been completed the fusing pressure roller and fusing belt are turned to achieve a uniform temperature e f the heating roller and the fusing pressure roller have reached their respective required temperatures the main body considers that the fusing unit rollers and belt have reached the specified temperatures It then terminates the post warm up control sequence A Control start timing e Atthe end of the warm up control no post warm up control sequences are performed if a print request is received B Control termination timing A predetermined period of time elapses after the post warm up control has been started The temperature of the heating roller reaches 170 C and that of the fusing pressure roller reaches 150 C or more A power save mode signal is received C Control operation timing 1 The fusing pressure roller and fusing belt are turned at the specified speed 2 The temperature adjustment is started with the target temperature of the fusing heater lamp 1 set at 170 C correction value At the same time the temperature adjustment is
60. A Y108600 3 Theory of Operation 43 13 Transfer section 1st transfer Theory of operation Ver 1 0 Nov 2006 13 3 7 1st transfer belt cleaning control e f there is a possibility of the main body being stopped with toner left on the surface of the transfer belt between the cleaning blade position and the 2nd transfer position due to a media misfeed or malfunction the intermediate transport motor is energized to turn the transfer belt The residual toner is thereby removed from the transfer belt Noforced cleaning sequence is carried out to clean the entire surface of the transfer belt d Color P325 P330 A Operation timing The 1st transfer cleaning sequence is carried out before the 2nd transfer cleaning as part of the initial operation sequence e The ist transfer cleaning sequence is carried out before the 2nd transfer cleaning opera tion is performed by the ATVC control system 4138t02049c1 N 2 KON SN FG WM NA 1st transfer belt cleaning area 13 3 8 1st transfer belt backward rotation control cs e on o Q o ie cs e 72 O 2 E e 9 To prevent media dust toner and other foreign matter from being wedged in the cleaning blade while the transfer belt remains stationary the transfer belt is turned backward so that the foreign matter can be removed Once the transfer belt is started turning backward this operation takes precedence over any other
61. Blank Page Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 2 Overall composition Composition Operation 2 Overall composition Duplex option Duplex option door 4538T2C001DA c e o Q o e 72 e Q E e 9 Y108600 3 Theory of Operation 3 3 Center cross section Theory of operation Ver 1 0 Nov 2006 3 Center cross section Duplex option Transport roller 1 Transport roll 1 Transport roll 2 e n o Q o 72 O 2 E e 9 Transport roller 2 4 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 4 Drive system 4 Drive system Reversing drive mechanism Duplex option cs e ol as o Q o e 2 O 2 e 9 Transport drive mechanism Y108600 3 Theory of Operation 5 5 Mechanical operations Theory of operation Ver 1 0 Nov 2006 5 Mechanical operations 5 1 Reversing mechanism 5 1 1 Reversing operation Duplex option The 1 sided printed page is subjected to a reversing operation performed by the exit roller in the main body and conveyed into the duplex option Conveyed into the duplex option Exit roller e n o Q o cs e 72 O 2 E e 9 5 1 2 Media exit roller drive coupling mechanism e When the duplex option is mounted the leading edge of the duplex option lever raises
62. C016DA Y108600 3 Theory of Operation 11 5 Operations Theory of operation Ver 1 0 Nov 2006 5 2 1 Entrance switch The media path for the media transported from the transport unit is changed so that the media may be fed into the sub tray transport section The transport motor provides the drive for media transport When the entrance solenoid is energized the entrance media guide is swung down so that the media path leading to the sub tray transport section is established Staple finisher Entrance media guide Composition Operation Entrance media guide Entrance solenoid SL1 A01FT2C019DA Entrance solenoid SL1 Entrance media guide AO1FT2CO18DA 12 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 5 Operations 5 2 2 Media transport Media transported from the transport unit is transported to the sub tray The transport motor provides the drive for transporting the media When the transport motor is energized the transport roller and exit roller are driven to rotate The entrance sensor and the transport section sensor detect media in the sub tray trans port section Staple finisher Exit roller Media full sensor PS4 Transport roller Transport section sensor PS2 NT di Entrance sensor PS1 AO1FT2C020DA Entrance sensor PS1 c e o Q o e 72 e Q E
63. Color Printer d Color P325 d Color P330 THEORY OF OPERATION Code Y108600 3 PUBLICATION ISSUED BY Olivetti S p A 77 Via Jervis 10015 Ivrea TO Italy Copyright O 2008 Olivetti All rights reserved THEORY OF OPERATION TOTAL CONTENTS SAFETY AND IMPORTANT WARNING ITEMS nene nenea anna S 1 IMPORTANT NOTICE vasset S 1 DESCRIPTION ITEMS FOR DANGER WARNING AND CAUTION S 1 SAFETY WARNINGS ss maia S 2 WARNING INDICATIONS ON THE MACHINE seen S 18 MEASURES TO TAKE IN CASE OF AN ACCIDENT e nenea amana aa S 21 Composition of the service manual men nenea nenea nana nana aan C 1 Notation of the service manual eseseesssssssssssseeee eene nnne nennen C 2 d Color P325 P330 main body pg m X 1 Composition Operation di 9 Duplex option 1011 RR RE ENE RDI P Q 1 GomposiipT VL PEEL HOIT soie ta dod ER EE a di a 3 Lower feeder unit Outline cm meme meme ene nre mene mrne aa aaa aaa ea aaa 1 CP OP d 3 Staple finisher GI 1 EE ERR a aaa EE eee AER M MM 1 Composition OPEN m m 5 Y108600 3 Theory of Operation i li Blank Page Theory of Operation Y108600 3 SAFETY AND IMPORTANT WARNING ITEMS SAFETY AND IMPORTANT WARNING ITEMS Read carefully the safety
64. O 2 e 9 14 3 Operation 14 3 1 2nd transfer roller pressure mechanism e The main body is provided with a mechanism that presses the 2nd transfer roller up against and retracts it from the transfer belt This is done to prevent the 2nd transfer roller from being dirtied due to patterns produced for purposes other than an actual print ing operation Such patterns may be produced during the image stabilization sequence or another function A 2ndtransfer roller pressure The 2nd transfer roller is pressed against the transfer belt to allow the toner image on the transfer belt to be transferred onto the media The 2nd transfer roller is pressed against the transfer belt to allow the roller to be cleaned B 2nd transfer roller retraction The 2nd transfer roller is retracted from the transfer belt when a detection pattern is pro duced on the transfer belt for registration correction control image stabilization control or other control The 2nd transfer roller is retracted from the transfer belt when the toner image on the transfer belt cannot be transferred to the media due to a media empty condition occurring during printing e The 2nd transfer roller is retracted from the transfer belt after the 2nd transfer of the last image is completed during a multi print cycle Y108600 3 Theory of Operation 47 14 Transfer section 2nd transfer Theory of operation Ver 1 0 Nov 2006 C Pressure retraction operation
65. PORTANT WARNING ITEMS 5 4 PRECAUTIONS FOR HANDLING THE LASER EQUIPMENT When laser protective goggles are to be used select ones with a lens conforming to the above specifications e When a disassembly job needs to be performed in the laser beam path such as when working around the printerhead and PC Drum be sure first to turn the printer OFF e If the job requires that the printer be left ON take off your watch and ring and wear laser protective goggles A highly reflective tool can be dangerous if it is brought into the laser beam path Use utmost care when handling tools on the user s premises The Print Head is not to be disassembled or adjusted in the field Replace the Unit or Assembly including the Control Board Therefore remove the Laser Diode and do not perform Control Board trimmer adjustment Y108600 3 Theory of Operation S 17 SAFETY AND IMPORTANT WARNING ITEMS WARNING INDICATIONS ON THE MACHINE Caution labels shown are attached in some areas on in the machine When accessing these areas for maintenance repair or adjustment special care should be taken to avoid burns and electric shock e This area generates high voltage Be careful not to touch here when the power is turned ON to avoid getting an electric shock e The area around the Fusing Unit is extremely hot Touching any part other than those indicated may result in burns vau enu A011P0C505DA 5 18 Theory of Operation Y108600 3
66. The media misfeed display can be reset when all doors are closed after any of the doors has been open At the same time the information on media left is cleared Thereafter the main body attempts to detect any sheet of media left inside it again Y108600 3 Theory of Operation 83 19 Conveyance section Registration roller Theory of operation Ver 1 0 Nov 2006 19 3 10 Remaining media detection control when the main power switch is turned ON e Any sheet of media left inside the main body is checked when the power switch is turned ON or a door is opened and closed e The main body checks sensors sequentially and if a sensor is found to be activated determines that there is a sheet of media left there inside the main body Then the main body gives the message of PAPER JAM on the panel This detection control is also executed when a cover is closed d Color P325 P330 19 3 11 Temperature humidity sensor The temperature humidity sensor detects temperature and humidity inside the main body The detected data are used for image stabilization control ATVC control and transfer output control cs e n o Q o e 72 fe Q E e 9 84 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 20 Fusing section 20 Fusing section 20 1 Composition d Color P325 P330 A011T2C511AA A011T2C056DA Media exit roller Media full sensor PS12 Fusing
67. a dudes 100 20 3 13 Protection against abnormally high temperature ssse 101 21 Image stabilization control enne nnne 103 21 1 Overview of image stabilization control ssrrnrnnnnnnnrrnnnrnnnnnrrnnnennrnrrnenrnnnnnnnne 103 21 1 1 Complete correction Four 103 21 1 2 Simplified correction control 104 21 1 3 Individual registration control ase painea lie 104 21 1 4 Image stabilization control execution request 105 21 1 5 Conditions enabling execution of stabilization control at the end of a print cycle of given conditions esessssss 105 21 1 6 Combination and execution sequence of different sub controls 106 NEN I are rm C 107 22 1 Fan eoe MEE OC D UU 107 211 PN 107 22 12 FUNCION EEE EE EE EE 107 221 3 Te 108 Y108600 3 Theory of Operation V d Color P325 P330 e n o Q o e 2 O 2 e 9 Theory of operation Ver 1 0 Nov 2006 d Color P325 P330 e n o Q o cs e 72 O 2 E e 9 Blank Page vi Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 1 System configuration Outline 1 System configuration e ce m ag LO N 20 a System front view 5 O i 19 4 A011F1C501DA 1 Main body 4 Lower feeder unit 2 Duplex option 5 Lower feeder unit 3 Hard disk kit 6 Staple finisher Y108600
68. a reference position adjustment mechanism rsnnrnnnvrrnnrrrnnnnnnnonnnnnn 10 4 1 11 Media misfeed detection control seessseeseeeeeeeeenee 10 Y108600 3 Theory of Operation i Theory of operation Ver 1 0 Nov 2006 Lower feeder unit e n o Q o cs e 72 O 2 E e 9 Blank Page li Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 1 Product specifications Outline E c 1 Product specifications 3 o o A Type n Name Add on 500 sheet media feed cassette E Type Front loading type Installation Desk type Media feeding system Media separation by a small diameter roller with torque limiter Document Alignment Center B Media type Media size B5S JIS Executive LetterS A4S Letter Plus G Legal Legal Media type Plain paper 60 to 90 g m 16 to 24 Ib Recycled paper 60 to 90 g m 16 to 24 Ib Capacity 500 sheets C Machine specifications Power Requirements DC 24 V 10 supplied from the main body DC 5 V 5 Max Power Con 16W sumption Dimensions 448 mm W x 520 mm D x 111 5 mm H 17 6 inch W x 4 4 inch D x 20 5 inch H Weight Approx 6 5 kg 14 25 Ib D Operating environment Temperature 10 to 30 C 50 to 95 F with a fluctuation of 10 C h 18 F h Humidity 15 to 85 with a fluctuation of 20 h NOTE These specifications are subject to change without notice Y108600 3 Theory
69. and important warning Items described below to understand them before doing service work IMPORTANT NOTICE Because of possible hazards to an inexperienced person servicing this product as well as the risk of damage to the product KONICA MINOLTA BUSINESS TECHNOLOGIES ING hereafter called the KMBT strongly recommends that all servicing be performed only by KMBT trained service technicians Changes may have been made to this product to improve its performance after this Service Manual was printed Accordingly KMBT does not warrant either explicitly or implicitly that the information contained in this service manual is complete and accurate The user of this service manual must assume all risks of personal injury and or damage to the product while servicing the product for which this service manual is intended Therefore this service manual must be carefully read before doing service work both in the course of technical training and even after that for performing maintenance and control of the product properly Keep this service manual also for future service DESCRIPTION ITEMS FOR DANGER WARNING AND CAUTION In this service manual each of three expressions A DANGER A WARNING and A CAUTION is defined as follows together with a symbol mark to be used in a limited meaning When servicing the product the relevant works disassembling reassembling adjustment repair maintenance etc need to be conducted with u
70. ange Energized for lowering Blocked Blocked Lower than the specified range Energized for raising 30 Media level lever Media level sensor 1 PS9 Tray up down motor M6 E Media level lever solenoid SL2 AO1FT2C064DA Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 5 Operations 5 5 3 Media holding mechanism The media level lever serves also for holding media down on the main tray while printed media stacks sets are fed out except for the stapling mode thereby preventing the media stacks sets which have previously been fed onto the main tray from being pushed out and dropped by a new media stack set being fed out The subsequent stack set of printed media is fed out with the preceding stack set of printed media held down by the media level lever Staple finisher Media Media a CO Y Vl Q CA e P Media level lever O Q cs e o Q o cs e 72 9 2 E e 9 E A01FT2C065DA Media level lever Media level lever Media level lever A01FT2C066DA Y108600 3 Theory of Operation 31 5 Operations Theory of operation Ver 1 0 Nov 2006 5 5 4 Media full detection The amount of media fed out into the main tray is detected by the media level sensor 1 media level sensor 2 and the tray lower sensor When the corresponding sensor detects either condition 1 or 2 described below the sta p
71. ardous radiation exposure semiconductor laser Maximum power of the laser diode 15 mW Wavelength 770 800 nm Denmark ADVARSEL Usynlig laserstr ling ved bning n r sikkerhedsafbrydere er ude af funktion Undg udseettelse for str ling Klasse 1 laser produkt der opfylder IEC60825 1 sikkerheds kravene halvlederlaser b lgel ngden 770 800 nm S 14 Theory of Operation Y108600 3 SAFETY AND IMPORTANT WARNING ITEMS Finland Sweden LUOKAN 1 LASERLAITE KLASS 1 LASER APPARAT VAROITUS Laitteen k ytt minen muulla kuin t ss k ytt ohjeessa mainitulla tavalla saat taa altistaa k ytt j n turvallisuusluokan 1 ylitt v lle n kym tt m lle laser s teilylle puolijohdelaser VARNING Om apparaten anv nds p annat s tt n i denna bruksanvisning specificerats kan anv ndaren uts ttas f r osynlig laserstr lning som verskrider gr nsen f r laserklass 1 halvledarlaser Den maximala effekten f r laserdioden 15 mW v gl ngden 770 800 nm VARO e Avattaessa ja suojalukitus ohitettaessa olet alttiina n kym ttom lle laser s teilylle Al katso s teeseen VARNING Osynlig laserstr ining n r denna del r ppnad och sp rren r urkopplad Betrakta ej str ien Norway ADVERSEL Dersom apparatet brukes p annen m te enn spesifisert i denne bruksanvisn ing kan brukeren utsettes f r unsynlig laserstr lning som overskrider grens
72. are restricted only to the latest ones with the old ones deleted When a page revised in Ver 2 0 has been changed in Ver 3 0 The revision marks for Ver 3 0 only are shown with those for Ver 2 0 deleted When a page revised in Ver 2 0 has not been changed in Ver 3 0 The revision marks for Ver 2 0 are left as they are Theory of operation Ver 1 0 Nov 2006 CONTENTS e e LO d Color P325 P330 main body M 5 Outline i 1 System OO TE ea oN EE o c EE 1 2 Product specification rede 2 3 Section configuration RR 5 4 Media pat MT 6 5 Image creation process mm eee nenea anna naaaaaaaaa 7 Composition Operation 6 Overall COMpOS ON e EO 9 m 6 1 Timing chart at main body powerup ssseneennnne n 9 6 2 Control block de 10 amp EM Coo n 11 5 rS EE 191 o ve 1 Le 1 EEE EE RE ENER 11 3 T2 PN 12 E 7 2 1 ENE eL C 12 zi 7 2 2 Laser exposure DIOCBSS Lcid ia gi di ei sti idi etel niese 12 7 2 3 Laser emission timihg inier rto etit tet pt ein ikke 13 7 2 4 Laser emission p RE EE EE 13 7 2 5 Laser light intensity control mmnnneeeee eee nn eee nana nana 14 7 2 6 Registration correction control mmmnnnneeeeee eee nennnnnnnnneeeeeee nenea e 14 8 Toner supply section p m 15 ee eI T T 15 ET ES 16 Bo MN NN 17 8 3 1 Toner cartridge capacity eee nenea nnne nne 17 8 3 2 Toner Conveying mechanism
73. ation roller 19 3 Operation 19 3 1 Conveyance speed control The intermediate transport motor provides drive for the conveyance section The conveyance speed is variable in four steps and the appropriate one is selected according to the media type and print mode as detailed below d Color P325 P330 Conveyance speed Media type print mode Plain paper monochrome print 185 mm s 216 mm s BE Plain paper color print 152mm s 185 mm s Thick stock envelopes postcards label OHP transparencies glossy paper plain paper in the To ensure good fusing 76 mm s glossy paper mode thick stock 1 in the glossy performance paper mode long size paper Thick stock 2 in the glossy paper mode 61 7 mm s To ensure gaed glossy performance Forthe first print the main body makes the above decision before starting a print media feed sequence and based on the established speed starts the print media feed sequence 19 3 2 Registration roller control cs e ol as o Q o e 2 O 2 e 9 e When the media taken up and fed in by the feed roller reaches the registration roller a loop is formed in the media and media conveyance is temporarily stopped Conveyance skew is corrected by this loop The registration sensor detects whether or not the media has reached the registration roller The media fed in is synchronized with the image before media conveyance is restarted
74. b Thick stock 1 91 to 150 g m 24 to 40 Ib Thick stock 2 128 to 210 g m 34 to 56 Ib e Glossy paper 1 100 to 150 g m 26 6 to 40 Ib e Glossy paper 2 128 to 210 g m 34 to 56 Ib OHP transparencies Letterhead Envelopes Labels Postcards Double postcards 1 Long size paper up to 1200 mm 47 2 inches Tray 2 Plain paper 60 to 90 g m 16 to 24 Ib Recycled paper 60 to 90 g m 16 to 24 Ib Tray 1 Plain paper and recycled paper 100 sheets Thick stock 1 thick stock 2 glossy paper 1 glossy paper 2 postcards OHP transparencies letterhead labels postcards and double postcards 20 sheets Envelopes 10 sheets Long size paper 1 sheet No indication of remaining media amount Tray 2 Plain paper and recycled paper 500 sheets Indication of remaining madia amount available Parallel IEEE 1284 Support only an ECP mode 10 Base T 100 Base TX 1000 Base T IEEE 802 3 Ethernet e USB 2 0 High Speed Host USB PictBridge 1 0 d Color P325 Freescale PowerPC 7448 733 MHz d Color P330 Freescale PowerPC 7448 866 MHz Theory of Operation 3 O eo 2 aL p LO CN GO at 9 Q G o 2 Product specifications Theory of operation Ver 1 0 Nov 2006 Memory Standard memory DDR SDRAM 133 MHz 184 pin non ECC 256 MB Expandable up to a 1024 MB Hard disk Optional 40 GB Compact flash card Commercially available compact flash cards of 256 MB 512 MB 1 GB
75. cartridge placement a new TC a toner near empty condition and a toner empty condi tion d Color P325 P330 e n o Q o e 72 O 2 E e 9 22 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 9 Print unit section overall composition 9 Print unit section overall composition 9 1 Composition PC motor A011T2C508AA A011T2C012DA Developing motor Replenishing screw Agitating screw Supply roller Developing roller Y108600 3 A011T2C013DA Toner collecting screw A011T2C014DA Theory of Operation 23 d Color P325 P330 Composition Operation 9 Print unit section overall composition Theory of operation Ver 1 0 Nov 2006 9 2 Operation 9 2 1 Print unit life detection Based on the photo conductor driving time the cartridge life is determined When the photo conductor driving time reaches its near life the near life warning mes sage appears The main body is designed to indicate a near life condition when the life remaining in the print unit becomes 40 percent of the total 30 000 sheets after approx 18 000 sheets have been printed for a standard original of a 596 coverage rate Approx 12 000 pages can be printed at 5 coverage with use of standard originals dur
76. collecting port shutter mechanism of the waste toner bottle 56 15 3 5 Waste Toner Box locking mechanism ssssssseeeeeee 57 15 3 6 Waste toner box locked position detection mechanism 57 15 3 7 Waste toner box in position detection mechanism ssss 58 15 3 8 Waste toner flow in the waste toner box eesessseeee 58 15 3 9 Waste toner near full condition detection control sssssse 59 15 3 10 Waste toner full condition detection control eect eee nana 59 16 Media feed section Tray 1 nana 60 161 CPA See 60 EE mm 61 160 DEP NN eee 61 16 3 1 Media lift plate mechanism mmmnnnnnnnee eee eee eee ae 61 16 3 2 Media separation mechanism sssssseeeeemnnn 62 15 98 Media f ed COITIOL Sean 62 16 3 4 Media empty condition detection control eee 63 16 3 5 Edge guide plale iei eere adrian pe e via RT S Iur adie Aaa 64 16 3 6 Media misfeed detection control eene nennen nnn 64 17 Media feed section Tray 2 sssssssssesseeeeseeeeeenen nnne 65 LZ CP SNE 65 Ur EPI EEE a E a ma na ai eee cee 66 Y108600 3 Theory of Operation iii d Color P325 P330 e n o Q o e 2 O 2 e 9 d Color P325 P330 e n D Q o e 72 O 2 E e 9 Theory of operation Ver 1 0 Nov
77. com mand par le constructeur Mettre au rebut les batteries usag es conform ment aux instructions du fabricant Denmark ADVARSEL Lithiumbatteri Eksplosionsfare ved fejlagtig h ndtering Udskiftning m kun ske med batteri af samme fabrikat og type Lev r det brugte batteri tilbage til leverand ren Finland Sweden VAROITUS Paristo voi r j ht jos se on virheellisesti asennettu Vaihda paristo ainoastaan laitevalmistajan suosittelemaan tyyppiin H vit k ytetty paristo valmistajan ohjeiden mukaisesti VARNING Explosionsfara vid felaktigt batteribyte Anv nd samma batterityp eller en ekvivalent typ som rekommenderas av apparat tillverkaren Kassera anv nt batteri enligt fabrikantens instruktion Norway ADVARSEL Eksplosjonsfare ved feilaktig skifte av batteri Benytt samme batteritype eller en tilsvarende type anbefalt av apparatfabrikanten Brukte batterier kasseres i henhold til fabrikantens instruksjoner S 12 Theory of Operation Y108600 3 SAFETY AND IMPORTANT WARNING ITEMS b Laser Safety This is a digital machine certified as a Class 1 laser product There is no possibility of danger from a laser provided the machine is serviced according to the instruction in this manual 5 1 Internal Laser Radiation semiconductor laser Maximum power of the laser diode 15 mW Maximum average radiation power 8 5 uW Wavelength 770 800 nm at laser aperture of the Print Head Unit This prod
78. conditions Forthe period of time that begins when the warm up cycle is started and ends when a predetermined period of time elapses after the warm up cycle has been completed e For the period of time that begins when a print cycle starts and ends when a predeter mined period of time elapses after the print cycle has been completed Forthe period of time during when the fusing pressure roller deformation prevention con trol is performed under the power save mode Forthe period of time when the thermistor 3 provided in the print head detects the tem perature of 42 degrees or more d Color P325 P330 Half speed rotation conditions The motor runs at a half speed during any time other than above The motor runs at a half speed only when printing in monochrome mode without a duplex option optional lower feed unit or staple finisher Stop conditions e Stopped in the power save mode The motor is however run while the ozone ventilation fan motor is running and stopped after the ozone ventilation fan motor has been stopped At this time the motor is run at full speed for a predetermined period of time after the intermediate transport motor has been stopped and is run at half speed thereafter Forced stop condition e A malfunction occurs but not when an error occurs cs e n o Q o e 72 O 2 E e 9 B Fusing fan motor control Full speed rotation conditions e Fo
79. crew Photo conductor Cleaning blade NENNEN E Charge A CEA corona Agitating screw Supply roller A011T2C508AA Developing roller Toner collecting Screw A011T2C014DA Developing motor Y M C M1 Developing motor K M5 A011T2C512AA A011T2C019DA Y108600 3 Theory of Operation 31 d Color P325 P330 Composition Operation 12 Print unit section developing Theory of operation Ver 1 0 Nov 2006 12 2 Operation 12 2 1 Developing drive control Polygon motor M8 d Color P325 P330 Intermediate transport motor M3 Color PC drum motor M2 Developing motor Y M C M1 Developing motor K M5 Charge K Charge YMC Developing Y Developing M Developing C e n o Q o e 72 Q 2 E e 9 Developing K 1st transfer pressure 1st transfer rem 2nd transfer pressure 2nd transfer rem EE me A011T2E064DA 32 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 12 Print unit section developing 12 2 2 Toner collecting port shutter mechanism The toner collecting port is equipped with a shutter mechanism that prevents toner from being spilled out when the print unit is removed from the main bogy After installing the print unit and the toner cartridges into the main body locking the print unit release lever opens the collecting po
80. cs e n o Q o e 2 O 2 e 9 Theory of operation Ver 1 0 Nov 2006 Duplex option e n o Q o cs e 72 O 2 E e 9 Blank Page li Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 1 Product specifications Outline 1 Product specifications A Type Name Duplex unit Type Switchback and circulating duplex unit Installation Mounted on the right side door of main body Reversing system Exit roller switchback Tracfer system Rubber roller driven rolls Document alignment Center B Media type Media size B5 A4S LetterS Legal Media type e Plain paper 60 to 90 g m 16 to 24 Ib e Recycled paper 60 to 90 g m 16 to 24 Ib C Machine specifications Power requirements DC 24 V 10 supplied from the main body DC 5 V x 5 supplied from the main body Max power 35 W consumption Dimensions 394 mm W x 320 mm D x 58 mm H 15 5 inch W x 12 6 inch D x 2 3 inch H Weight Approx 1 8 kg 4 0 Ib D Operating environment Temperature 10 C to 30 C 50 F to 86 F with a fluctuation of 10 C h 18 F h Humidity 15 to 85 with a fluctuation of 20 h NOTE These specifications are subject to change without notice Y108600 3 Theory of Operation 1 c e ES e o x 2 a a 1 Product specifications Theory of operation Ver 1 0 Nov 2006 c 2 Q o x a 3 a
81. cting port is conveyed to the waste toner transport unit The toner conveyed is carried to the suction transport unit by the transport roller provided in the waste toner transport unit The conveyed toner is carried to the toner collecting port of the waste toner box by the conveyance screw provided in the suction transport unit The toner conveyed is stored into in the waste toner box by the conveyance screw provided in the waste toner box Waste toner collecting screw Toner collecting Screw Waste toner transport unit Print unit 2nd conveyance screw Waste toner bottle Waste toner collecting screw Suctiion transport unit ADTITSOSPUDA Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 15 Waste toner collecting section 15 3 2 Toner flow at the 2nd transfer section 1 Toner scraped off by the cleaning blade provided in the transfer belt unit is collected onto the middle of the transfer belt unit by the toner collecting screw 2 The toner collected is conveyed to the suction transport unit through the toner col lecting port that is provided in the middle of the transfer belt unit 3 The conveyed toner is carried to the toner collecting port of the waste toner box by the conveyance screw provided in the suction transport unit 4 The toner conveyed is stored into in the waste toner box by the conveyance screw provided in the waste toner box d Color P325 P330 Waste toner collecting screw Transfer belt
82. dia in the finishing tray The aligning belt is driven by the transport motor The exit roller is driven by the exit motor The upper exit roller is moved up or down by the exit roller up down motor The aligning plate is driven by the align motor Staple finisher AO1FT2C038DA Exit roller up down motor M5 cs e on o Q o ie cs e 72 O 2 E e 9 New wee ee ee eee Ges ND Transport roller aligning belt A01FT2C071DA 20 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 A Operation Exit roller Aligning belt A01FT2C039DA Backward direction A01FT2C040DA Aligning plate AO1FT2C041DA Y108600 3 Theory of Operation 21 5 Operations The transport motor drives the align ing belt so that the media is trans ported up to the position of the exit roller When the trailing edge of the media moves past the aligning belt the exit roller up down motor starts rotating to lower the upper exit roller The exit motor rotates in the direc tion of storing media causing the exit roller to rotate in the direction of storing media The exit roller and aligning belt makes the media make a switchback operation so that the media is stored in the finishing tray The media is pressed up against the stopper so as to be aligned proper
83. ductor to the transfer belt the transfer volt age is applied to the 1st transfer roller e A charge of the same potential is applied to each of the 1st transfer rollers The transfer voltage is applied after the 1st transfer roller Y M C is pressed against the transfer belt for color mode The transfer output is turned OFF after the last image moves past the 2nd transfer sec tion d Color P325 P330 13 3 2 1st transfer roller pressure retraction control e To extend the service life of the photo conductor Y M C the pressure position of the 1st transfer roller is changed between the monochrome mode and the color mode The 1st transfer roller K is not provided with a retraction mechanism the transfer belt is pressed against the photo conductor K at all times e The intermediate transport motor provides the drive for pressure retraction operation of the 1st transfer roller Y M C A Monochrome mode The 1st transfer roller Y M C is moved inward the unit for retraction and the photo con ductor Y M C is stopped The transfer roller is moved retracted and the photo conduc tor is stopped also in the ordinary standby state B Color mode During the 1st transfer in the color mode the 1st transfer roller Y M C is moved toward the photo conductor pressed so that transfer belt is pressed against the photo conduc tor C Others The transfer roller is moved retracted and the photo conductor is stopped in the ordi
84. e OFF of the corresponding heater lamp is reset so that power supply to the heater lamp is resumed This operation is repeated until the CPU recovers to be able to detect the abnormally high temperature condition This control allows the power supply to the corresponding heater lamp to be shut down before the thermostat operates inhibiting the fusing unit from being damaged Theory of Operation 101 d Color P325 P330 cs e ol as o Q o e 2 O 2 e 9 20 Fusing section Theory of operation Ver 1 0 Nov 2006 C 3rd stage Thermostat protection f neither the soft protection nor hard protection can detect an abnormally high tempera ture due to a defective thermistor the thermostat 1 and thermostat 2 operate at the spec ified temperature This shuts down the power supply to the fusing heater lamp 1 and fusing heater lamp 2 thus forcibly turning them OFF d Color P325 P330 Heating roller fusing heater lamp 1 FH1 Fixing unit Thermostor Thermostat 1 TH1 Heating roller Ls N a m SV Fusing pressure Hard protection Thermostor Fusing pressure roller fusing heater lamp 2 FH2 Abnormal signal FUSER WDT detection circuit RESET cs e on o Q o cs e 72 O 2 E e 9 Heating roller REM Fusing pressure roller REM Main switch J A011T2C057DA 102 Theory of Operation Y108600 3 T
85. ed section Tray 1 Write section Media feed section Ao11T1C500AA Tray 2 o eo e oO a Te N eo Aa 9 O Q o 4 Media path Theory of operation Ver 1 0 Nov 2006 4 Media path o e e a ES Te N eo oO LM 9 O Q o A011T1C001DA p 1 sided media path gt 2 sided media path gt 1 sided media path from the tray 1 6 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 5 Image creation process 5 Image creation process 8 Media separation 7 2nd image transfer 9 Transfer belt cleaning 6 1st image transfer d Color P325 P330 2 PC drum 10 PC drum cleaning 5 Developing V ALL 1 Printer processing 4 LD exposure 1 Printer processing The intensity of the laser light is controlled based on the image signal transmitted from the host computer PC drum The image of the original projected onto the surface of the PC drum is changed to a corresponding electrostatic latent image 3 PC drum charging PC drum charging Apply DC charge to the photo conductor 4 LD exposure The surface of the PC drum is irradiated with laser light and an electrostatic latent image is thereby formed 5 Developing The toner agitated and negatively charged in the toner chamber is attracted onto the electrostatic latent image formed on the sur face of the PC drum It is thereby changed to a visible developed image 6 1s
86. edia is removed from the exit tray which again shades the media full sensor When the tray is empty Media full sensor PS12 Media holding plate When media is loaded 4138T2C003DA Media f 4138T2C004DA f 7A Media 4138T2C005DA 92 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 20 Fusing section Proactive control To shorten the time period that begins when a print request is accepted and ends when the fusing sequence starts the fusing motor is turned beforehand Control start timing When a print request is accepted in print ready condition after the warm up cycle was complete Control termination timing e After the lapse of a predetermined time at the start of a print cycle when a malfunction occurs or at the start of the sleep mode d Color P325 P330 J Print start wait control To ensure good fusing performance for the first print the print start timing is retarded The control also prevents the media from sticking during printing on OHP transparencies in the color mode Operation The print start timing is retarded using the value of either one of the two wait periods whichever is longer calculated under the following two conditions 1 Using the data provided by the temperature humidity sensor and other sensors the period of time that begins when the print control print start timing control is started and ends when the first sheet of media reaches t
87. eeeee nana aaa 28 TES BP eee 28 IRE NEG PT TE 29 11 2 1 Charge corona unit ON OFF control sssssssssseseeeene 29 11 2 2 Output during pre process lt lt nn ao aan tnim tk khan me EAR n ERA SR REA RAN nevn 29 1 23 Output during pOSIHDIOCBSS ied up ioa xa tte Hal utr a ii RM E 29 11 2 4 Ozone ventilation mechanism sssssssseeeeneeennne 30 12 Print unit section developing nenea nana aaa 31 12 1 0101 RE iata ducer pads qas mal 31 12 2 Operation EE EE TT fea LM t ase 32 12 2 1 Developing drive control LL erint ie te ete t orte p ba ea 32 12 2 2 Toner collecting port shutter mechanism esses 33 122 3 TONET NOW r re 34 12 244 Developing esteri ccs iiic Susie burn ias ouv Serre ade dd en ka at 35 225 gener usc tona tae qutd iae Ropa ties se 36 12 2 6 Toner collecting port shutter mechanism rerrrnnnnnnnnnnnnrnnnnnnnnrrrrnrrrnnnnnenenr 36 13 Transfer section 1st transfer nennen 37 Is NEC IER E NE EEE 37 13 2 ED e 38 13 3 OAM Ape eder 39 1831 tsttr nster output Control oui teu Eee th ene ra tite testene 39 13 3 2 1sttransfer roller pressure retraction control eseessesssesess 39 19 8 3 1sttransfer roller pressure operation eeesseeeeeeeeeeee 40 13 8 4 1sttransfer roller retraction operation eee 41 13 3 5 1sttransfer roller pressure retraction posit
88. el sensor a cleaning sheet is provided that cleans the window in the light guiding path periodically d Color P325 P330 LED Sensor U U U Cleaning sheet cs 0 Q Light guiding path o V ke ZU z 5 Cleaning sheet 4138t02012c2 4138t02012c1 Print unit Print unit 8 3 8 Toner empty condition detection control A sequence is started for detecting a toner empty condition when a toner near empty condition is detected In starter cartridges shipped with a main body the toner empty detection control always functions The main body determines that there is a toner empty condition when the toner level sensor output value remains below a predetermined value and if the following event is detected a predetermined number of consecutive times the output value of the toner level sensor remains a predetermined value or lower for more than a predetermined period of time The consecutive detection count is retained even when power is turned OFF e A toner empty condition is reset when a new toner cartridge is detected Display example Toner empty indication Magenta TONER EMPTY REPLACE 4138F3E004DA Y108600 3 Theory of Operation 21 8 Toner supply section Theory of operation Ver 1 0 Nov 2006 8 3 9 Toner cartridge life control e Each toner cartridge is provided with a TC detection board that detects state of a toner
89. en for laser klass 1 halvleder laser Maksimal effekt till laserdiode b lgelengde 770 800 nm Y108600 3 Theory of Operation S 15 SAFETY AND IMPORTANT WARNING ITEMS 5 2 Laser Safety Label A laser safety label is attached to the inside of the machine as shown below COMPLIES WITH 21 CFR 1040 10 AND 1040 11 EXCEPT FOR DEVIATIONS PURSUANT TO LASER NOTICE NO 50 DATED JULY 26 2001 or and CLASS 1 LASER PRODUCT LASER KLASSE 1 PRODUKT PRODUCTO LASER DE CLASE 1 RAPA Usa Ho HE A011POE504DA 5 3 Laser Caution Label A laser caution label is attached to the outside of the machine as shown below CCEBCLZZ38RUIBL SX CET L LEBEREV BAAVLANTIEEN AER N CAUTION CLASS 3B INVISIBLE LASER RADIATION WHEN OPEN AVOID EXPOSURE TO THE BEAM N VORSICHT KLASSE 3B UNSICHTBARE LASERSTRAHLUNG WENN ABDECKUNG GEOFFNET NICHT DEM STRAHL AUSSETZEN AA ADVARSEL KLASSE 3B USYNLIG LASERSTR LING N R DEKSEL PNES UNNG EKSPONERING FOR STR LEN AA VARO AVATTAESSA OLET ALTTIINA LUOKAN 3B NAKYMATTOMALLE EEN LASERSATEILYLLE ALA KATSO S TEESI AA ADVARSEL USYNLIG KLASSE 3B LASERSTRALING VED BNING UNDG UDS ETTELSE FOR STRALING AA VARNING OSYNLIG LASERSTR LNING KLASS 3B N R DENNA DEL AV OPPNAD STR LEN R FARLIG HTARGIBARTNAHER BERRE FMBASTANBHCRSRESB CRAB RRA URS AH ro Holz eh SIIB AoAo USC Yue SS Da FANS 4034 7405 A011P0C503DA 5 16 Theory of Operation Y108600 3 SAFETY AND IM
90. ents the number of times the revision has been made NOTE Revision marks shown in a page are restricted only to the latest ones with the old ones deleted When a page revised in Ver 2 0 has been changed in Ver 3 0 The revision marks for Ver 3 0 only are shown with those for Ver 2 0 deleted When a page revised in Ver 2 0 has not been changed in Ver 3 0 The revision marks for Ver 2 0 are left as they are Theory of operation Ver 1 0 Nov 2006 CONTENTS Duplex option Outline 1 Pga Composition Operation 2 Overall compoSitoN EEE EEE 3 PP NG 4 ESN re 5 Mechanical operations PE 5 1 Reversing mechanism perete e oii eta guano d E Baie ul a ed iat 5 1 1 Reversing operation m 5 1 2 Media exit roller drive coupling mechanism sseseseeeeeeeeee 5 1 3 Reverse motor control eeesesssssseseeeeeneeenn nennen nnne 5 2 Conveyance and duplex media feed mechanism cccccccecceeeeeeeesssssssestteeeeees 5 2 1 Conveyance and duplex media feed operation ssssssssses 5 2 2 Warsport motor COPI iid e Seta i se ix neben dt De aleea 5 3 2 sided printing method ete E intcr ERE HEAR SIRE ASPEN EPRA kne 5 3 1 Process of 2 sided printing with a single sheet of media resident MESEN b rsene 5 3 2 Process of 2 sided printing with two sheets of media resident Mies eL 10 Y108600 3 Theory of Operation Duplex option
91. er The first sheet of media is fed in and the image of the second page of the print job is p printed Duplex option 4538t02502c1 Operation 2 Just before the 1 sided printed page moves 9 past the exit roller the direction of rotation of S the exit roller is reversed and the first 1 sided 5 printed page is conveyed into the duplex 5 option iz The second sheet of media is fed alongside GA s 5 M 7 D 4538t02513c1 Operation 3 e The first 1 sided printed page is conveyed through the duplex option The image of the fourth page is printed on the second sheet of media fed alongside 4538t02514c1 10 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 Operation 4 Immediately before the second sheet of media exits the feed roller the rotating direc tion of the feed roller changes and the second sheet of media is transported into the duplex option The first sheet of media is fed alongside again The second sheet of media is fed alongside Operation 5 The image of the first page is printed on the first sheet of media as it is fed again Operation 6 The image of the third page is printed on the second sheet of media as the first sheet of media is discharged The third sheet of media is fed alongside Operation 7 Asthe second sheet of media is fed out
92. ess of 2 sided printing with a single sheet of media resident in the system Operation 1 Exit roller A sheet of media is fed in and the image of the second page of the print job is printed T Operation 2 Just before the 1 sided printed page moves e past the exit roller the direction of rotation of oe the exit roller is reversed and the 1 sided n Bs printed page is conveyed into the duplex option Operation 3 The 1 sided printed page being transported Bw through the duplex option is stopped briefly pan and then fed into the main body 8 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 5 Mechanical operations Operation 4 The image of the first page of the print job is printed on the 1 sided printed page fed out of the duplex option Duplex option Operation 5 Asthe 2 sided printed page is being fed out of z the main body the image of the fourth page of the print job is printed on the second sheet of j media Composition Operation e Steps 2 through 5 are repeated until all pages of the job are printed Y108600 3 Theory of Operation 9 5 Mechanical operations Theory of operation Ver 1 0 Nov 2006 5 3 2 Process of 2 sided printing with two sheets of media resident in the sys tem Operation 1 Exit roll
93. etermined time Media feed sensor PS2 Tray 4 not Misfeed at Feed clutch CL1 Tray 4 ON within a predetermined ime d Color P325 P330 feeding section 2nd side in duplex Transfer motor M1 Duplex unit ON printing Registration sensor PS4 not acti vated within a predetermined time When registration roller clutch CL2 activated media feed clutch 1 All trays Registration roller clutch CL2 ON CL1 media feed clutch 2 CLS and media feed clutch CL1 Tray 3 Tray 4 also activated Registration sensor PS4 not acti vated Media feed sensor PS2 Tray 3 not Misfeed at vertical deactivated conveyance section Registration sensor PS4 not acti vated Media feed sensor PS2 Tray 4 not deactivated PS4 not deactivated Media other Registration sensor PS4 activated than PS8 not activated long size Registration roller clutch CL2 acti paper i d m PS4 not deactivated After long size media registration sensor PS4 and registration sen Media feed sensor PS2 Tray 3 ON Composition Operation Media feed sensor PS2 Tray 4 ON Long size paper Hegisira ion Sensor Hed GN sor PS4 activated they are not deactivated in two seconds Misfeed at exit fusing Exit sensor PS8 activated PS8 not deactivated section Exit sensor PS8 deactivated ADCB not activated PS4 not activated Misfeed at duplex unit Duplex unit feed sensor activated ADCB not deactivated
94. ets 20 sheets Min 92 mm x 148 mm in Main Main Letterhead 3 5 x 5 75 inch 20 sheets 91 to 150 g m Thick paper 1 24 25 to 40 Ib 151 to 210 g m This papera 40 25 to 55 75 Ib Y108600 3 Theory of Operation 1 1 Product specifications Theory of operation Ver 1 0 Nov 2006 2 Sort offset group offset Max Capacity Main tray B5S A4S 8 x 11S A4S Media length longer than 300 mm 8 1 2 x 11S 8 1 x 14 Plain paper Max 216 mm x 356 mm 60 to 90 g m 500 sheets or 50 250 sheets or 25 Recycled paper 8 5 x 14 inch 16 to 24 Ib Min 182 mm x 257 mm 7 25 x 10 inch iJ Oo fe z c KD a E op 3 Sort stable lt Normal mode gt Max Capacity Main tray No of Media length sheets to longer than be stapled 300 mm 8 1 x 11S AAS or less B5S A4S 8 1 x 118 8 1 x 14 Plain paper Max 216 mm x 356 mm 90 to 90 g m 400 sheets or 200 sheets or Recycled paper 8 5 x 14 inch 16 to 24 Ib Min 182 mm x 257 mm 30 sheets 7 25 x 10 inch The number of sheets to be stapled is limited for high density images Color wise 3 20 sheets x 20 sets Cover mode Max Capacity Main tray No of Media length Sheets to c eS longer than be stapled A4S or less 300 mm B5S A4S 8 1 Xx 1 1S 8 1 X 14 28 sheets Plain paper Max 216 mm x 356 mm 60 to 210 g m 2 sheets Recycled paper 8 5 x 14 inch 16 to 55 75 Ib or less
95. for Min 182 mm x 257 mm thick paper 7 25 x 10 inch D Stapling Staple filling mode Dedicated Staple Cartridge 5000 staples Staple detection Available Near empty 20 remaining staples Stapling position Rear corner 49 degrees Media size B5S A4S 8 1 x 118 8 7 x 14 Manual staple None 2 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 1 Product specifications E Machine specifications Power requirements DC 24 V 10 supplied from the main body iS Max power 48 W or less m consumption EI Ko o Stapling unit 475 W x 462 D x 360 H mm Dimensions l 18 75 W x 18 25 H x 14 25 D inch Relay unit 284 W x 394 D x 360 H mm 11 0 W x 15 5 D x 14 0 D inch Stapling unit 10 0 kg 22 Ib Weight Relay unit 2 0 kg 4 5 Ib Excluding items furnished with the unit F Operating environment e Conforms to the operating environment of the main body NOTE These specifications are subject to change without notice Y108600 3 Theory of Operation 3 2 Media path Theory of operation Ver 1 0 Nov 2006 2 Media path 5 i 5 2 1 Feeding media to the main tray o o i o Feeding media Transporting media to the media Transportna media to the main tray aligning section from is dn body a i O lO O o EO AO1FT1C003AA 2 2 Feeding media to the sub tray Feeding media Transporting media to the finisher to the
96. for squeezing and any other damage Current can leak leading to a risk of electric shock or fire Carefully remove all toner remnants and dust from electri cal parts and electrode units such as a charging corona unit Current can leak leading to a risk of product trouble or fire Check high voltage cables and sheaths for any damage Current can leak leading to a risk of electric shock or fire 5 8 Theory of Operation Y108600 3 SAFETY AND IMPORTANT WARNING ITEMS Safety Checkpoints NWARNING Check electrode units such as a charging corona unit for deterioration and sign of leakage Current can leak leading to a risk of trouble or fire Before disassembling or adjusting the write unit P H unit incorporating a laser make sure that the power cord has been disconnected The laser light can enter your eye leading to a risk of loss of eyesight Do not remove the cover of the write unit Do not supply power with the write unit shifted from the specified mount ing position The laser light can enter your eye leading to a risk of loss of eyesight When replacing a lithium battery replace it with a new lith ium battery specified in the Parts Guide Manual Dispose of the used lithium battery using the method specified by local authority Improper replacement can cause explosion After replacing a part to which AC voltage is applied e g optical lamp and fixing lamp be sure to check the installa
97. gers the firing of each laser light which illuminates the index board via the polygon mirror G1 lens separation mirror K and SOS lens This gener ates an SOS signal This SOS Start of Scan signal unifies the timing at which the laser lights are irradiated for each main scan line The SOS signal is generated only from the K laser light For the other colors the emis sion timing is determined with reference to K d Color P325 P330 7 2 4 Laser emission area A Main scan direction FD The print start position in the FD direction is determined by the FD print start signal HSYNO that is output from the MFP board and the width of the media The laser emission area is determined by the media size However there is a 4 mm 0 157 wide void area on both the both edges of the media B Sub scan direction CD The print start position in the CD direction is determined by the CD print start signal TOD that is output from the MFP board and the length of the media However there is a 4 mm 0 157 wide void area on both edges of the media The laser emission area is determined by the media size However there is a 4 mm 0 157 wide void area on both the leading and trailing edges of the media HSYNC d VIDEO Void width 4 mm 0 157 Void width 4 mm 0 157 gt cs e ol as o Q o e 72 O 2 e 9 NIDEO TOD Void width 4 mm 0 157 Void width 4 mm
98. get temperature of the Heating roller heater lamp set at the appropriate level for each media to be printed Similarly the temperature adjustment is started with the target temperature of the pressure heater set at the appropriate level for each media to be printed 3 When the leading edge of the first sheet of media moves past the registration roller the fusing pressure roller and fusing belt are turned at the specified speed corre sponding to the type of the media 4 fthere is another sheet of media to be printed when the trailing edge of the pre ceding sheet of media moves past the fusing pressure roller fusing belt the fusing heater lamp 1 temperature fusing heater lamp 2 temperature and the fusing speed are changed to the settings that correspond to that particular piece of media 5 After the trailing edge of the last sheet of media moves past the exit roller the con trol proceeds to post print cycle control To prevent fusing failure that may happen just after the main power switch is turned ON the fusing temperature is set to higher than normal until the specified time elapses or the specified number of printed pages is produced after the warm up cycle has been com pleted When a print cycle is started the temperature control is reset to normal after a predeter mined number of printed pages is produced e f the stand by condition remains the temperature control is reset to normal after a pre determined time elapses
99. he fusing belt is calculated 2 If the first print is produced on OHP transparencies in the color mode the wait time is calculated to ensure that the media interval is the specified value 20 3 3 Fusing temperature control cs e ol as o Q o e 2 O 2 e 9 To fuse the toner image on the media image yet to be permanently fixed properly into the media the heater lamps are turned ON and OFF as necessary to bring the fusing temperature to an appropriate level Thermistors are used to detect the surface temperatures of the heating roller and fusing pressure roller The heater lamps are then turned ON and OFF as necessary to achieve the set temperature The control temperature in the print command wait state is called the standby tempera ture while that for permanently fix the toner image on media into the media is called the print temperature Y108600 3 Theory of Operation 93 20 Fusing section Theory of operation Ver 1 0 Nov 2006 20 3 4 Fusing temperature control management The appropriate type of temperature control is provided according to the main body sta tus Heater OFF Warm up control A y a Post warm up control gt v Wait control Proactive control Print control Post print cycle control d Color P325 P330 on o Q o 72 fe Q E e 9 A011T2E070DA A
100. he media lift plate media stack is pressed against the feed roller The media lift plate media stack is pressed upward by the springs at all times Springs Lock release lever 4138t02113c0 4138t02114c0 Media lift plate 4 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 4 Operations 4 1 2 Feed roller vertical transport roller control The feed roller and vertical transport roller are rotated which feeds media from the lower feeder unit and conveys it further into the inside of the main body 1 The transport motor is energized to turn the vertical transport roller 2 The media feed clutch is energized to turn the feed roller 3 The media is fed in by the feed roller 4 The media fed in by the feed roller is conveyed onto the synchronizing roller of the main body by the vertical transport roller 5 When the media feed sensor is activated and then the media is conveyed onto a predetermined point in the media path the media feed clutch is de energized thus bringing the feed roller to a stop The vertical transport roller thereafter takes charge of conveying media further 6 When the trailing edge of the last sheet of media moves past the registration sen sor the transport motor is de energized to bring the vertical transport roller to a stop Media feed clutch CL1 S EQ PAGS LF SS RE Vertical transport roller Feed roller A Separation roller Transport mo
101. he staple finisher is mounted on the main body Opening the transport cover raises the leading edge of the actuator of the transport unit This results in the other end of the actuator being lowered The lowering of the actuator of the transport unit lowers the media holding plate at the exit section of the main body As the media holding plate of the exit section of the main body is lowered the media full sensor at the exit section of the main body is blocked When the media full sensor of the exit section of the main body is blocked opening of the transport cover is detected Staple finisher Close Open Transport cover Media holding plate e o Q o ie cs e 72 O 2 E e 9 Actuator of the transport unit EE Media full sensor exit section of the main body Actuator of the transport unit A01FT2C013DA 10 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 5 Operations 5 2 Sub tray transport section e The sub tray transport section controls drive for transporting media from the transport unit out onto the sub tray The media fed onto the sub tray does not undergo shift or stapling process Staple finisher A01FT2C014DA A01FT2C015DA Transport motor M3 Entrance solenoid SL1 cs e ol o Q o e 2 O 2 e 9 Entrance media guide A01FT2
102. heory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 10 Print unit section photo conductor 10 Print unit section photo conductor 10 1 Composition Photo conductor d Color P325 P330 A011T2C508AA A011T2C012DA Photo conductor Charge transport layer Aluminum base Charge corona Charge generating layer cs e ol n o Q o e 2 O 2 E e 9 4138t02018c4 Direction of rotation 4138to2505c1 10 2 Drive Color PC drum motor M2 A011T2C015DA Y108600 3 Theory of Operation 25 10 Print unit section photo conductor Theory of operation Ver 1 0 Nov 2006 10 3 Operation 10 3 1 Photo conductor drive mechanism Motors are used for the drive mechanism independently of the developing system to sup press incorrect color registration and uneven pitch To stop the drive for the color toner cartridges in the monochrome mode different motors are used to drive the color photo conductors and black photo conductor The color PC drum motor drives the photo conductor Y M and C while the intermediate transport motor drives the photo conductor K n addition to the photo conductor K the intermediate transport motor also drives the transfer system media feed system and synchronizing drive system Gears having a large diameter are used to enhance rotating accuracy of the photo con ductors The use
103. heory of operation Ver 1 0 Nov 2006 21 Image stabilization control 21 Image stabilization control To ensure that a stabilized output image is produced at all times a comprehensive con trol is provided for the developing bias voltage laser light intensity registration correction gamma characteristics detection and other parameters d Color P325 P330 21 1 Overview of image stabilization control e Image stabilization control may be divided into three types complete correction control simplified correction control and individual registration control The following explain specific details of each type of control 21 1 1 Complete correction control Controls 1 through 6 below are collectively called the complete correction control For details of each of these controls see the relevant page Control name Purpose Changes in various types of characteristics due to change with time of the IDC sensor deteriorated LED dirty sensor surface part to part variations in the sensors and change of environment affect the IDC Sensor output corresponding to the clear transfer belt surface To correct fluctuations in the output the sensor LED intensity is adjusted so as to keep constant the IDC sensor output value IDC sensor calibration control See P 73 If the developing bias voltage Vpp is too high for the Ds distance in each toner cartridge a leak image background leak image area leak results If Vpp is exce
104. ias reverse polarity E EN E EE H 2nd transfer bias forward polarity E EE EE E H A011T2E065DA Y108600 3 Theory of Operation 51 15 Waste toner collecting section Theory of operation Ver 1 0 Nov 2006 15 Waste toner collecting section 15 1 Composition d Color P325 P330 A011T2C504AA A011T2C059DA Waste toner transport unit Toner collecting screw Print unit Composition Operation Suction transport unit M E Waste toner collecting bottle A011T2C037DA 52 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 15 Waste toner collecting section 15 2 Drive Developing motor K M5 d Color P325 P330 Waste toner collecting screw Waste toner transport unit Waste toner collecting screw N e 2nd conveyance screw Suctiion transport unit YS Waste toner bottle 1st conveyance screw lt A011T2C038DA Waste toner bottle cs e ol n o Q o e 2 O 2 e 9 Y108600 3 Theory of Operation 53 d Color P325 P330 cs e on o Q o ie cs e 72 O 2 E e 9 15 Waste toner collecting section 15 3 15 3 1 1 2 54 Theory of operation Ver 1 0 Nov 2006 Operation Toner flow at the 1st transfer section Toner scraped off by the cleaning blade in the print unit is conveyed to the toner col lecting port by the toner collecting screw The waste toner conveyed to the toner colle
105. ias voltages are alternately applied to the 2nd transfer roller This allows toner residue on the surface of the 2nd transfer roller to be transferred back to the transfer belt thus cleaning the 2nd transfer roller Any voltage for other control purposes is not applied during the cleaning procedure The toner transferred back to the transfer belt is collected by the cleaning blade d Color P325 P330 2nd transfer roller d S nA ee O ix Cleaning blade 4138t02579c0 4 v 4 4 y A Operation timing e The 2nd transfer roller cleaning sequence is carried out after the intermediate transfer belt has been cleaned during recovery from a media misfeed or malfunction The cleaning sequence is carried out if 100 printed pages are produced after the last cleaning sequence The cleaning sequence is carried out when a media size error occurs B Control 1 The 2nd transfer roller is pressed 2 The 2nd transfer bias voltage of reverse polarity is applied for the period of time corresponding to one revolution of the 2nd transfer roller 3 The 2nd transfer bias voltage of forward polarity is applied for the period of time corresponding to one revolution of the 2nd transfer roller 4 Steps 2 and 3 are repeated five times 5 The 2nd transfer roller is retracted cs e ol as o Q o e 2 O 2 e 9 2nd transfer roller Gen Pressed Retracted 2nd transfer b
106. ie d Color P325 P330 Registration roller Prism Sensor Prism Sensor output amp N LED Remote ES 4138t02583e0 4138t02103c1 OHP sensor PS7 e on o Q o ie cs e 72 O 2 E e 9 e f the media type setting does not match the results of OHP detection the main body suspends the print cycle and displays the message TRAYX TYPE ERROR on the panel The media that has caused type error is fed out of the main body after going through the 2nd transfer and fusing processes The subsequent sheets of media are subjected to the following operation Exit operation Printed Feed Print Suspend Exit Subsequent sheets Fed 80 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 19 Conveyance section Registration roller 19 3 8 Media size error detection control To prevent incorrect printed pages the size of the media being conveyed is detected using the registration sensor and media feed sensor e The length of the media is detected based on the value calculated using the period of time that begins when the sensor is activated and ends when it is deactivated for each media source Forthe lower feeder unit even if the media feed sensor does not detect a media size error the downstream registration sensor makes an error check again d Color P325 P330 Media length detection sensor Regist
107. ilable for use in the toner chamber 5 The toner conveyed to the toner chamber is agitated charged by the replenishing screw and agitating screw 6 Toner conveyed onto the rear side of the toner chamber is fed to the supply roller 7 Toner fed to the supply roller is conveyed onto the developing roller At this time the regulator blade 1st and 2nd regulate the height of toner on the sur face of the developing roller 8 Toner on the developing roller is fed to the electrostatic latent image formed on the surface of the photo conductor 9 Toner left on the developing roller is neutralized and returned to the supply roller 10 The toner on the surface of the photo conductor is transferred onto the transfer belt 11 Toner left on the surface of the photo conductor is scraped off by the cleaning blade 12 The toner scraped off by the cleaning blade is conveyed to the waste toner convey ance section by the toner collecting screw 13 The toner conveyed by the toner collecting screw is conveyed and stored as waste toner in the waste toner bottle d Color P325 P330 cs e on o Q o ie cs e 72 O 2 E e 9 Toner collecting screw A011T2E079DA Toner collecting port Replenishing screw Agitating blade Toner collecting screw Agitating screw Photo conductor Supply roller Developing roller A011T2E080DA 34 Theor
108. ion Operation Staple finisher Composition Operation 5 Operations Theory of operation Ver 1 0 Nov 2006 5 5 Main tray section The main tray section controls the media level and detection of a media full condition in order to accommodate properly media fed out of the staple finisher AO01FT2C058DA A01FT2C002AA Media level Media level Me sensor 2 PS10 sensor 1 PS9 Media level lever Media level lever Media level lever solenoid SL2 A Media level lever Tray up down motor Tray up down gear Tray lower sensor PS13 Tray upper sensor PS12 A01FT2C059DA 28 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 5 Operations 5 5 1 Main tray ascent descent e Rotation of the tray up down motor in either the forward or backward direction drives the tray up down gear to move the main tray up or down The tray upper sensor detects the main tray at its upper limit position The tray lower sensor detects the main tray at its lower limit position Staple finisher Tray up down gear Tray upper sensor PS12 Tray up down motor M6 Tray lower sensor PS13 A01FT2C060DA Composition Operation Tray upper sensor PS12 Tray lower sensor PS13 A01FT2C061DA AO1FT2C062DA Tray up down motor M6 A01FT2C063DA Y108600 3 Theory of Operation 29 Staple finisher cs e on o Q o e 72 O 2 E e 9 5 Operati
109. ion control 42 13 3 6 Transfer belt cleaning mechanism rrrnnrnnnnnnvennvvnnnnnvnnnnnnnnnnnnnnennnennnneevn 43 13 8 7 1sttransfer belt cleaning control nene nn eee 44 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 13 3 8 1sttransfer belt backward rotation control rrrrrnrrrrnnrrnnnnnrnnrrrnnnnnnnnnnnnnnr 44 13 8 9 Toner collecting port shutter mechanism eeeeeesses 45 14 Transfer section 2nd transfer ssesssssssssesssssseeneen nnne 46 ICE eU c 46 42 DE pre 47 14 3 NPR 47 14 3 1 2nd transfer roller pressure mechanism esses 47 14 3 2 2ndtransfer roller pressure position deviation preventive mechanism 49 14 3 3 2nd transfer voltage CON erinnert sento aa a ago Pur Rb UR DIE 50 14 3 4 2ndtransfer voltage setting control ATVC auto transfer voltage control 50 14 8 5 2ndtransfer roller cleaning control eee 51 15 Waste toner collecting section ccc nene eee nea nnnnnneee eee 52 BT PN 52 BE i em 53 15 3 Operation M jm 54 15 3 1 Waste toner collecting mechanism at the 1st transfer section 54 15 3 2 Toner flow at the 2nd transfer section ssreennvnnnnnnvnnnnnnnnnnnnnnnnnnnnnnnnennnenn 55 15 3 3 Toner collecting port shutter mechanism at the suction transport unit 56 15 3 4 Toner
110. is fed through during PPM control 100 Theory of Operation Y108600 3 Theory of 20 3 13 operation Ver 1 0 Nov 2006 20 Fusing section Protection against abnormally high temperature e The main body provides protection at three different stages to prevent abnormally high temperature of the fusing unit 1 2 3 A 1st e Ifthe value Soft protection Hard protection Thermostat protection stage soft protection thermistor 1 or the thermistor 2 detect a temperature exceeding a predetermined the malfunction code representing abnormally high temperature is displayed At this time the heater lamps are turned OFF forcibly and the initiation of any new print cycle B 2nd is prohibited abnormally high temperature detection control stage hard protection e The following hard protection control is provided if the CPU overruns and becomes unabl 1 2 3 Y108600 3 e to detect an abnormally high temperature The thermistor 1 or thermistor 2 detect a temperature exceeding a predetermined value The remote signal for the corresponding heater lamp of the DC power supply is forcibly turned OFF through the MFP board The triac on the DC power supply is turned OFF to shut down the power supply to the corresponding heater lamp The heater lamp is forcibly turned OFF The temperature detected by the thermistor 1 or thermistor 2 is decreased to a level below the predetermined value The remote signal forcibl
111. is started After the temperature goes up to 80 degrees or more the fusing motor is turned for 1 sec See P 99 F Media exit detection control The exit sensor detects the media conveyed from the fusing belt and fusing pressure roller The exit sensor is placed right after the fusing pressure roller in order to detect the media jam and prevent the media from being wound to the fusing pressure roller Exit sensor PS8 4138t02108c0 90 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 20 Fusing section G Media width detection control The fusing media size sensor detects the width of the media being conveyed e f the width of the media that has moved past the fusing media size sensor is 210 mm A4 width or more the leading edge of the media pushes up the actuator of the sensor thus blocking the sensor When the sensor is blocked the main body considers that the width of the media is equivalent to A4 width or more e f the width of the media that has moved past the fusing media size sensor is less than 210 mm A4 width the actuator of the sensor is not moved and the sensor is left unblocked When the sensor is unblocked the main body considers that the width of the media is a small size B5 size or less For media size detection the main body recognizes the media size using the media size setting made in the controller and determines it after the media has actually been fed through The media
112. l o Q o e 2 O 2 e 9 Supply roller Developing roller Regulator blade 1st Regulator blade 2nd A011T2C024DA Charge neutralizing sheet Developing roller bias Charge corona Supply roller bias Regulator blade bias Grid mesh A011T2C025DA Y108600 3 Theory of Operation 35 12 Print unit section developing Theory of operation Ver 1 0 Nov 2006 12 2 5 Cleaning mechanism A Cleaning operation 1 The cleaning blade is pressed against the surface of the photo conductor to remove toner left off the surface fixed blade system 2 The toner which has been scraped off by the cleaning blade is conveyed by the toner collecting screw and collected in the waste toner transport section d Color P325 P330 Cleaning blade Photo conductor Q Cleaning blade Toner collecting screw A011T2C027DA A011T2C028DA 12 2 6 Toner collecting port shutter mechanism e o Q o Ed cs e 2 Q Q E e 9 The toner collecting port is equipped with a shutter mechanism that prevents toner from being spilled out when the print unit is removed from the main body When the print unit is installed into the main body the shutter of the toner collecting port opens and toner can be discharged from the print unit Toner collecting port A011T2C029DA Toner collecting port A011T2C030DA 36 Theory
113. le Lever indicator indicating the Media lift plate media supply level A media empty condition Lever When media 4138t02118c0 is loaded 4 1 6 Media empty condition detection control The media empty message is displayed on the panel when the empty sensor actuator unblocks the media empty sensor e No mechanism is provided for detecting a media near empty condition The media sup ply level indicator serves this purpose When media Actuator is loaded C Media empty sensor PS1 A media empty condition Media lift plate 4138t02119c0 Y108600 3 Theory of Operation 7 Lower feeder unit cs e ol n o Q o e 72 O 2 E e 9 4 Operations Theory of operation Ver 1 0 Nov 2006 4 1 7 Edge guide plate The edge guide plate can be slid to the exact size in the width direction of the media to be loaded A4 B5 8 12 Lower feeder unit Edge guide plate 4138t02120c0 4 1 8 Trailing edge guide plate e on o Q o ie cs e 72 O 2 E e 9 The trailing edge guide plate can be slid to the exact size in the length direction of the media to be loaded 14 inch 13 inch 127 10 inch A4 11 101 2 inch B5 Trailing edge guide plate 4138t02121c0 8 Theory of Operation Y108600 3 Theory of operation Ver
114. le finisher determines that the maximum capacity of the printed media on the main tray has been reached giving the following message on the control panel OUTPUT FULL REMOVE PAPER MAIN TRAY Staple finisher Conditions Media level sensor 1 Media level sensor 2 Tray lower sensor Evaluation EG Unblocked Blocked Blocked Media full Unblocked Unblocked Blocked e f the sensor detects that the exit tray is full printing is stopped The message OUTPUT FULL REMOVE PAPER MAIN TRAY is reset when the media is removed from the main tray cs e n D Q o e 72 O 2 E e 9 32 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 5 Operations 5 6 Staple section The staple section controls the stapling unit for stapling the printed media stack set aligned neatly and staple empty detection A01FT2C067DA A01FT2C068DA 5 6 1 Stapling mechanism e Stapling is performed by the stapling unit When the stapling motor is rotated the clinch arm lowers The stapler thereafter goes up to drive a staple in the media e Stapling is performed at one point at the rear corner of the media stack set Clinch arm Stapling motor 9J08T20012DA Y108600 3 Theory of Operation 33 Staple finisher cs e ol o Q o e e 2 O 2 E e 9 5 Operations Theory of operation Ver 1 0 Nov 2006 5 6 2 Stapling positio
115. lied to the media At this time the transport roller in the transport unit slips and the media fed in first is transported in the forward direction by the force of the transport roller in the finisher Y108600 3 Theory of Operation 9 Transport roller 1 Torque limiter Transport roller 2 DE Torque limiter Finisher section AO1FT2C010DA Transport roller Media fed in first Media fed in next sequent a ER fi iai L T E I IL Transport roller 2 Transport roller 1 O TG Finisher section ligning plate roller Aligning plate rolle AO1FT2CO11DA Staple finisher cs e ol n o Q o cs e 72 O 2 E e 9 5 Operations Theory of operation Ver 1 0 Nov 2006 5 1 4 Transport cover open close detection The transport unit is not provided with any sensors for detecting the open or closed posi tion of the transport cover The media full sensor located at the fusing section of the main body functions to detect the open or closed position of the transport cover Mounting the staple finisher on the main body changes the function assigned to the media full sensor to that of detecting the open or closed position of the transport cover In addition the media full sensor mounted in the finisher section performs the function of detecting a media full condition when t
116. ly in the feeding direction When the media is stored in place the exit roller up down motor starts rotating to raise the upper exit roller The aligning belt up down solenoid is energized so that the aligning belt is raised The aligning motor starts rotating to press the aligning plate up against the media This aligns the media properly in the crosswise direction The aligning belt up down solenoid is energized to lower the aligning belt In staple mode the printed media stack set is stapled together after the media aligning sequence Staple finisher cs e ol n o Q o cs e 72 O 2 E e 9 5 Operations Theory of operation Ver 1 0 Nov 2006 5 4 2 Finishing tray media full detection on staple mode The number of printed media that can be stored in the finishing tray on staple mode var ies depending on the length of media Media length Plain paper 300 mm or under 30 sheets Over 300 mm 20 sheets e f the media length is 300 mm or less the count is taken according to the definitions given below when a job is received from the main body It is determined that the finishing tray capacity has been reached when the count reaches 30 e f the media length exceeds 300 mm the count is taken according to the definitions given below when a job is received from the main body It is determined that the finishing tray capacity has been reached when the count reaches 20 Media length Plai
117. med before 2nd transfer 77 19 3 5 Control of loop formed before fusing section rvrrrrnnrrnnnnvrrnnrrnnnennrnnrrnennr 78 19 3 6 Media TAPT mm 79 19 3 7 OHP transparencies detection control nenea nana ea 80 19 3 8 Media size error detection control mmmeee eee ee 81 19 3 9 Conveyance system media misfeed detection control 82 19 3 10 Remaining media detection control when the main power switch FIN 84 19 3 11 Temperature humidity sensor mmm nenea nana nana aaa 84 20 FUSIN SEGUON css iezii ae pa et d de ag ta a d a i 85 201 Ne 85 BUS JE EE TE EE TE ERE EE EE EE TN 86 20 3 CU II T mmm 87 20 3 1 Fusing pressure roller pressure selection mechanism 87 20 3 2 Fusing pressure roller drive control 88 iv Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 20 3 3 FUSING temperature corfolusvuseeimosnestnsneedemsedsoumeuebrneidsi 93 20 3 4 Fusing temperature control management 0 eee cece eee nn nana 94 20 3 5 Warm up SON Ice ta ciori intari e pete nidis Praet te etiem d aaa acp led ui 95 20 3 6 Post warm up control Lasse 97 20 3 7 Wait Control M D 97 20 3 8 PE Mee quiet m 98 20 3 9 PT OM 98 20 3 10 Post print control E 99 20 3 11 Heater OFF control iii icre etate arie teii sari s pa veti para 99 20 3 12 PPM cord niscai Sare aaa i o atit 70 nn al 3 Sur in
118. media conveyance Registration sensor PS4 Registration roller clutch CL2 Sub scan print start signal TOD A011T2E068DA 76 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 19 Conveyance section Registration roller B Registration roller clutch control n synchronization with the leading edge of the image the sub scan print start signal TOD of the controller after the leading edge of the media has reached the registration roller and a loop has been formed in the media the registration roller clutch is energized to start turning the registration roller e After the lapse of a predetermined period of time after the registration sensor has been deactivated by the media the registration roller clutch is de energized to stop the regis tration roller d Color P325 P330 Registration sensor PS4 Registration roller clutch CL2 Sub scan print start signal TOD A011T2E069DA 19 3 4 Control of loop formed before 2nd transfer A loop is formed in the media by the difference between the 2nd transfer roller media conveyance speed 1 000 and the registration roller media conveyance speed 1 006 e The loop formed in the media absorbs effect from the registration roller side thus pre cs 9 D Q Q 9 venting it from being transferred to the 2nd transfer section 8 5 O 2nd transfer roller Registration roller Y108600 3 Theory of Operation 77 1
119. motor discharges heat generated from the interior parts including the DC power supply fusing unit toner cartridges K and motor drives out of the main body to prevent the interior temperature from rising inordinately Air passageway is formed on top of the DC power supply in the duct inside the toner car tridge rail and below the print head housing No air flows through areas around the toner cartridges This effectively prevents toner from scattering cs e ol n o Q o e 2 O 2 E e 9 B DC power supply fan motor Discharges heat generated from the interior parts including the DC power supply inter mediate transfer belt section toner cartridges C M Y and motor drives from the main body to prevent the interior temperature from rising inordinately C Ozon fan motor e Discharges heat generated from the print head from the main body to prevent the print head temperature from becoming inordinately high e Removes ozone produced from the toner cartridges and charging section Air passageway is formed on top of the DC power supply in the duct inside the toner car tridge rail and below the print head housing No air flows through areas around the toner cartridges This effectively prevents toner from scattering Y108600 3 Theory of Operation 107 22 Miscellaneous Theory of operation Ver 1 0 Nov 2006 22 1 3 Control A DC power supply fan motor control Full speed rotation
120. n e When the staple finisher is mounted on the main body the printed media is fed out face down with its trailing edge first The staple is driven into the media stack set at an angle of 49 degrees relative to the printed surface at the rear corner Staple finisher Typical stapling positions ye 4 5 6 3 Staple sheet empty detection A01FT2C069DA e Staple empty detection sensor 1 2 detect whether or not there is a staple sheet still left e When the number of staples left in the staple cartridge becomes about 20 a staple sheet empty condition results causing a corresponding empty message to appear on the con trol panel e When the empty condition is detected the corresponding empty indication is given on the control panel At the same time the Stapling Unit moves to the front When a new staple cartridge is loaded the stapling motor is energized until the self prim ing sensor detects a staple which results in the staple to be fed up to the stapling posi tion cs e n D Q o e 72 O 2 E e 9 X Self priming sensor1 2 Staple empty detection sensor1 2 AO1FT2CO70DA 34 Theory of Operation Y108600 3 UPDATING STATUS DATE UPDATED PAGES CODE 05 2008 157 EDITION Y108600 3
121. n control Areflective sensor is used for the IDC sensor that detects the amount of toner sticking to the surface of the transfer belt Image stabilization is performed based on the value detected The detection pattern toner image produced on the surface of the transfer belt is irradi ated with light emitted by the LED of the sensor The photodiode of the sensor detects the light reflected off the toner pattern on the sur face of the transfer belt Photodiode Transfer belt surface 4138t02085c0 4138t020 A voltage corresponding to the intensity of the light reflected off the toner pattern is out put to the MFP board Amount of toner Intensity of light 72 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 18 Conveyance section IDC sensor 18 2 2 IDC sensor calibration control Changes in various types of characteristics due to change with time of the IDC sensor deteriorated LED dirty sensor surface part to part variations in the sensors and change of environment affect the IDC sensor output corresponding to the clear transfer belt surface To correct fluctuations in the output the sensor LED intensity is adjusted so as to keep constant the IDC sensor output value d Color P325 P330 18 2 3 IDC sensor shutter mechanism e Since the IDC sensor is installed below the transfer belt it can be dirtied with toner or other foreign matter A shutter mechanism is therefore provided above
122. n paper Finishing tray full count value Staple finisher 1 e If itis determined that the maximum finishing tray capacity is reached in the middle of a print job the staple finisher forces the remaining sheets of media out cs e n D Q o e 72 O 2 E e 9 22 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 5 Operations 5 4 3 Aligning belt up down mechanism When the aligning plate and media ejector are operated the aligning belt is made to leave the media The aligning belt is moved up or down through drive from the transport motor When the aligning belt up down solenoid is energized while the transport motor is rotat ing the drive from the transport motor is transmitted to the aligning belt up down gear As a result the aligning belt is moved up or down The aligning belt sensor detects the position of the aligning belt Staple finisher Transport motor M3 Aligning belt sensor PS11 Aligning belt up down solenoid SL3 AO1FT2CO42DA cs e n o Q o cs e 72 O 2 E e 9 A01FT2C043DA A01FT2C044DA Aligning belt sensor PS11 Aligning belt up down solenoid SL3 AO1FT2C045DA Y108600 3 Theory of Operation 23 5 Operations Theory of operation Ver 1 0 Nov 2006 5 4 4 Aligning plate mechanism The aligning plate is moved to align media in
123. n unblocked the pressure retraction clutch 1 is de energized Retraction position sensor 1 PS9 Slidi lat iding plate Q 4138t02046c1 C Pressure retraction operation timing 1st image transfer roller retracted 1st image transfer roller pressed Retraction position sensor 1 PS9 blocked Retraction position sensor 1 PS9 unblocked Pressure cam angle 0 80 1 20 240 280 360 4138t02046c2 42 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 13 Transfer section 1st transfer 13 3 6 Transfer belt cleaning mechanism To scrape residual toner off the surface of the transfer belt the transfer belt is provided with a cleaning blade The cleaning blade is in pressed contact with the transfer belt at all times That is it cleans the surface of the transfer belt as long as the belt turns The toner scraped off by the cleaning blade is collected to the middle of the transfer belt by the toner collecting screw The collected waste toner is conveyed through the waste toner collecting port located at the middle of the transfer belt unit and the suction transport unit and brought to the waste toner box d Color P325 P330 Cleaning blade Transfer belt Toner collecting screw 4138t02035c1 cs e ol as o Q o e 2 O 2 e 9 Waste toner collecting port Toner collecting screw A011T2C034D
124. nductor is irradiated with a laser light so that an electrostatic latent image is formed on it d Color P325 P330 7 2 2 Laser exposure process 1 The laser light emitted by each of the semiconductor laser Y M C and K is reflected onto the polygon mirror via the synthetic mirror 2 Since the angle of incidence for each color of laser light varies the laser light reflected by the polygon mirror is reflected at a different angle for each color 3 The condensing angle of each color of laser light is corrected by the G1 lens before reaching each return mirror 4 The K laser light is condensed on the surface of the photo conductor through the separation mirror and G2 lens 5 The Y M or C laser light is condensed on the photo conductor through the separa tion mirror G2 lens and return mirror Index sensor SOS lens G1 lens cs e on o Q o e 72 O 2 E e 9 Separation mirror Polygon mirror Return mirror 1st Semiconductor laser Photo conductor Return mirror 2nd G2 lens 4138t02502c0 12 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 7 Write section 7 2 3 Laser emission timing e When a ready signal is detected after the lapse of a given period of time after the print cycle has been started a laser ON signal is output from the MFP board The laser ON signal trig
125. ng pressure applied by the fusing pressure roller to the fusing pad Place the dial in the top position when printing is to be done on plain paper or a similar type of media for a high pressure Place the dial in the bottom position when printing is to be done on envelopes for a low pressure Whenever printing on envelopes the pressure selector dial must be placed in the appro priate position When the print cycle using envelopes is completed be sure to place the dial back in the original position If the print cycle is started without first selecting the appropriate position of the dial enve lopes are very likely to be wrinkled and the image could be poorly fused on plain paper and similar media Pressure selector dial Fusing pad Fusing pressure roller 4138t02106c0 Y108600 3 Theory of Operation 87 d Color P325 P330 cs e ol as o Q o e 2 O 2 e 9 d Color P325 P330 cs e n o Q o e 72 O 2 E e 9 20 Fusing section Theory of operation Ver 1 0 Nov 2006 20 3 2 A Fusing speed selection control Fusing pressure roller drive control The fusing motor provides drive for the fusing section The appropriate fusing speed is selected according to the media type and print mode to prevent fusing failure n the glossy paper mode the appropriate fusing speed is selected according to the media type
126. ns NDANGER Using any cables or power cord not specified by KMBT Using any fuse or thermostat not specified by KMBT Safety will not be assured leading to a risk of fire and injury Disabling fuse functions or bridging fuse terminals with wire metal clips solder or similar object Disabling relay functions such as wedging paper between relay contacts Q 9 lt Disabling safety functions interlocks safety circuits etc CA Safety will not be assured leading to a risk of fire and Q GN injury SN e Making any modification to the product unless instructed by KMBT Q Using parts not specified by KMBT 5 2 Theory of Operation Y108600 3 SAFETY AND IMPORTANT WARNING ITEMS 2 POWER PLUG SELECTION In some countries or areas the power plug provided with the product may not fit wall outlet used in the area In that case it is obligation of customer engineer hereafter called the CE to attach appropriate power plug or power cord set in order to connect the product to the supply Power Cord Set or Power Plug NWARNING Use power supply cord set which meets the following criteria provided with a plug having configuration intended for the connection to wall outlet appropriate for the prod uct s rated voltage and current and the plug has pin terminal s for grounding and aD lg provided with three conductor cable having enough cur rent capacity and the cord set meets
127. of Operation 1 1 Product specifications Theory of operation Ver 1 0 Nov 2006 gm 5 wi D o D S pe o o E Blank Page Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 2 Overall composition Composition Operation 2 Overall composition Lower feeder unit Media lift plate Lower feeder unit right door Media level indicator lever B Auxiliary guide c e o Q o e 2 72 9 Q E fe O 4537T2C001DA Vertical transport roller Transport Feed roller motor M1 Separation roller 453710250202 Media empty sensor Empty sensor actuator PS1 Media feed sensor actuator Media feed sensor PS2 4537t02519jo Media size switch MS2 Size detection board Y108600 3 Theory of Operation 3 3 Drive Theory of operation Ver 1 0 Nov 2006 3 Drive Media feed clutch CL1 Ss A Y i SG i NI R SI HA G Transport motor M1 Feed roller yQ Separation roller 4537T2C002DA Lower feeder unit Vertical transport roller 4 Operations 4 1 Media feed control cs e n o Q o ie cs e 72 O 2 E e 9 4 1 1 Media lift plate mechanism The media lift plate is pressed down into the locked position in which the media is loaded in position Load a media stack and then slide the tray into the main body This unlocks the media lift plate T
128. of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 13 Transfer section 1st transfer 13 Transfer section 1st transfer 13 1 Composition d Color P325 P330 A011T2C503AA A011T2C031DA Retraction position sensor 1 PS9 Sliding plate Transfer belt drive roller 7 Retraction lever Y M C Transfer belt EE An O SS J Composition Operation 1st transfer roller 1st transfer roller Y Si transfor rolere 1st transfer roller K Driven roller 1st transfer roller M Pressure cam Cleaning blade 4138t02035c2 Toner collecting screw Intermediate transport motor M3 Toner collecting port A011T2C032DA Y108600 3 Theory of Operation ar 13 Transfer section 1st transfer Theory of operation Ver 1 0 Nov 2006 13 2 Drive Pressure retraction clutch 1 CL4 PE c d Color P325 P330 Intermediate transport motor M3 4138t02038c0 Mechanism for driving the belt Transfer belt drive roller cs e on o Q o ie cs e 72 O 2 E e 9 Driven roller 4138t02041c1 Mechanism for driving the pressure retraction motion Sliding plate Pressure cam 1st transfer roller Y M C K Sliding plate Toner collecting screw A011T2C033DA 38 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 13 Transfer section 1st transfer 13 3 Operation 13 3 1 1st transfer output control To transfer the toner image from the photo con
129. of configuration of each unit operating system and control system Field Service section GENERAL Explanation of system configuration and product specifications MAINTENANCE Explanation of service schedule maintenance steps ser vice tools removal reinstallation methods of major parts and firmware version up method etc ADJUSTMENT SETTING Explanation of utility mode service mode and mechanical adjustment etc TROUBLESHOOTING Explanation of lists of jam codes and error codes and their countermeasures etc APPENDIX Parts layout drawings connector layout drawings timing chart overall layout drawing are attached Y108600 3 Theory of Operation C 1 Notation of the service manual A Product name In this manual each of the products is described as follows 1 PCRB Print control board 2 d Color P325 P330 Main body 3 Microsoft Windows 95 Windows 95 Microsoft Windows 98 Windows 98 Microsoft Windows Me Windows Me Microsoft Windows NT 4 0 Windows NT 4 0 or Windows NT Microsoft Windows 2000 Windows 2000 Microsoft Windows XP Windows XP When the description is made in combination of the OS s mentioned above Windows 95 98 Me Windows NT 4 0 2000 Windows NT 2000 XP Windows 95 98 Me NT 2000 XP B Brand name The company names and product names mentioned in this manual are the brand name or the registered trademark of each company C Feeding direction When the long side of the paper is parallel with
130. of gears having a large diameter provides a large number of gear teeth which suppresses uneven pitch and eccentricity Drive is transmitted to each of the photo conductors when the coupling on the drive end is engaged with that on the driven end d Color P325 P330 Intermediate transport motor M3 cs e n o Q o e 72 O 2 E e 9 Coupling 26 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 10 Print unit section photo conductor 10 3 2 Photo conductor post exposure control The entire surface of the photo conductor is exposed to light before the photo conductor stops rotating during the stop sequence or color change sequence from the color print to monochrome print after a print cycle Ozone stagnant in areas near the charge corona unit is adsorbed on the surface of the photo conductor This reduces sensitivity of the photo conductor causing white bands to occur in the image To prevent this image failure from occurring the entire surface of the photo conductor is exposed to light and thus neutralized This effectively prevents the surface of the photo conductor from absorbing ozone d Color P325 P330 10 3 3 Photo conductor total exposure control upon recovery e f the Photo conductor post exposure control described above is not correctly done the entire surface of the photo conductor is exposed to light thereby preventing ozone fr
131. oltage is applied after the 2nd transfer roller has been pressed against the transfer belt d Color P325 P330 14 3 4 2nd transfer voltage setting control ATVC auto transfer voltage control The transfer voltage is corrected to reduce effect from the transfer belt and environmen tal changes of toner A Operation timing A print request is accepted The temperature inside the main body changes beyond the specified range during a multi print cycle Image stabilization control is executed 1000 to 2000 printed pages have been produced after the last 2nd transfer voltage con trol was performed The transfer roller unit is replaced The temperature and humidity inside the main body change beyond the specified range for the first time after the last 2nd transfer voltage control was performed B Control 1 1 The 2nd transfer roller is pressed against the transfer belt A constant current is applied to the 2nd transfer roller The voltage of the 2nd transfer roller surface is detected Using a conversion formula the output value of the transfer voltage is determined The current temperature inside the main body is detected and backed up cs e n o Q o e 72 O 2 E e 9 p ge po mo 50 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 14 Transfer section 2nd transfer 14 3 5 2nd transfer roller cleaning control DC positive and negative transfer b
132. om being adsorbed on the surface of the photo conductor e f the Photo conductor post exposure control is not performed due to a media misfeed or malfunction the entire surface of the photo conductor is exposed to light at the same time that the 2nd transfer roller cleaning control is performed during the recovery proce dure from the media misfeed or malfunction 10 3 4 Photo conductor small amount rotation control Ozone stagnant in areas near the charge corona unit reduces sensitivity of the photo conductors causing white bands to occur in the image To prevent this image problem the photo conductor is turned so as to allow its surface facing the charge corona unit to deviate thereby preventing the surface sensitivity from being reduced cs e ol as o Q o e 2 O 2 e 9 A Photo conductor small amount rotation timing e The number of execution sequences is determined when the post process following a print cycle is completed The control is executed while the color PC drum motor or inter mediate transport motor is in the standby state f the color photo conductors need to be turned a small amount during the monochrome mode the control is executed also for the color photo conductors Photo conductor Charge corona unit 4138t02018c4 Y108600 3 Theory of Operation 27 11 Print unit section charge corona Theory of opera
133. on ary toner stagnates at the print unit anges Direction of rotation Toner supply Agitating blade conveyance screw meter as viewed from above of motor shaft IN IM M6 dac di sk Stationar Stationary n Stationary Turned When the motor turns forward When the motor turns backward Toner supply motor M6 Toner supply motor M7 Ss KEN e N MN OM ey gt 7 KI ZS 2 a d 5 GS Y C one way clutch turns M K one way clutch turns 4138t02013c0 4138t02014c0 Y108600 3 Theory of Operation 19 d Color P325 P330 cs e ol n o Q o e e 2 O Q E e 9 8 Toner supply section Theory of operation Ver 1 0 Nov 2006 8 3 5 Toner level detection The toner level is determined by the accumulated time of rotation of the toner supply motor The toner level can be checked through MENU PRINT MENU STATISTICS PAGE 8 3 6 Toner near empty condition detection d Color P325 P330 The cumulative period of time through which the toner supply motor is energized is detected as the basis for determining whether there is a toner near empty condition The main body is designed to indicate a toner near empty condition when the toner level remaining in the toner cartridge becomes approx 40 percent Pages that can be printed Toner cartridge Toner level after toner near empty 9 Targeted percent detection Targeted number of pages Toner cartridge shipped with main body
134. on i Staple finisher cs e n o Q o cs e 72 O 2 E e 9 Staple finisher e n o Q o cs e 72 O 2 E e 9 li Theory of operation Ver 1 0 Nov 2006 5 5 3 Media holding mechanism TE ea S pe ae 31 5 5 4 Media Tull detection uses 32 56 Staple Setio cM 33 5 6 1 Stapling megchanistm s ios coto ga ua again d at tercie paie ia te 33 5 6 2 Stapling EEE EE EE EE ee 34 5 6 3 Staple sheet empty detection rennnnnnnnrrnnnnrnnrnrrnnnnnnnrnrnnnnnrnnrnnnnnnnrnnnnnnnnr 34 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 1 Product specifications Outline 5 uU fe 1 Product specifications 2 A Type 8 7 Type Staple finisher suspended on the main body Installation Suspended on the main body Document alignment Center Media ejection system Face down Output from the back end Consumables Staples B Functions Sort group Sort offset group offset Sort stable C Media type 1 Non sort sort group Max Capacity Sub tray Main tray 5bx7 S 18 17 x11S Media length B6S longer than or less 300 mm Sub Sub Plain paper 60 to 90 g m 100 sheets 50 sheets Recycled paper 16 to 24 Ib Main Main 500 sheets 250 sheets Postcard A6S A5S B5S A4S Envelope 5 1 5 X 8 8 8 1 x1 1S m GMP Fim E ex 14 Glossy paper Max 216 mm x 356 mm Sub Sub Label 8 5 x 14 inch 20 she
135. on is detected when the cumulative total number of print dots waste toner detection dot count exceeds a predetermined value after a waste toner box near full condition has been detected A waste toner full condition warning is given on the panel at this time The main body accepts no print job after the waste toner full condition has been detected The waste toner full warning indication disappears when a new waste toner bottle is installed AA WASTE TONER FULL REPLACE BOTTLE p A011T2E078DA Y108600 3 Theory of Operation 59 d Color P325 P330 e n o Q o e 2 Q 2 E e 9 16 Media feed section Tray 1 Theory of operation Ver 1 0 Nov 2006 16 Media feed section Tray 1 16 1 Composition A011T2C507AA A011T2C510AA Feed roller Media lift plate Empty sensor actuator Media empty sensor 2 PS3 Edge guide plate A011T2C050DA Separation roller Empty sensor actuator Media empty sensor 2 PS3 Edge guide plate Feed roller Separation roller 4138T2C001DB 60 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 16 Media feed section Tray 1 16 2 Drive Media feed clutch 1 CL1 Feed roller d Color P325 P330 Intermediate transport motor M3 4138T2C002DB 16 3 Operation 16 3 1 Media lift plate mechanism The media lift plate will be locked under the media lift plate lock lever by pressing it down in which the
136. ons Theory of operation Ver 1 0 Nov 2006 5 5 2 Media level detection mechanism The main tray moves up or down according to the amount of media fed onto it media level sensor 1 and media level sensor 2 control the media level each time a sheet of media is fed out so that the level of the media fed onto the tray remains constant at all times When the media level lever solenoid is energized the media level lever advances to a position above the main tray When the media level lever solenoid is deenergized the media level lever is retracted The angle of the media level lever is changed according to the height of the main tray When the media level lever is located at a specific position media level sensor 1 or media level sensor 2 is blocked unblocked According to the combination of the different states detected of media level sensor 1 and media level sensor 2 the height of the main tray is determined If itis determined that the media level is higher than a predetermined range the tray up down motor is energized until to lower the tray until the predetermined tray height is reached If itis determined that the media level is lower than the predetermined range the tray up down motor is energized until to raise the tray until the predetermined tray height is reached Media level sensor 1 Media level sensor 2 Tray up down motor Unblocked Blocked Falling within the specified range Unblocked Unblocked Higher than the specified r
137. or 4138t02045c1 Y108600 3 Theory of Operation 41 d Color P325 P330 cs e ol as o Q o e 2 O 2 e 9 d Color P325 P330 cs e on o Q o cs e 72 O 2 E e 9 13 Transfer section 1st transfer Theory of operation Ver 1 0 Nov 2006 13 3 5 1st transfer roller pressure retraction position control A Pressure position control The pressure and retraction operation of the 1st transfer roller is controlled as the retrac tion position sensor 1 detects the movement of the sliding plate 1 The pressure retraction clutch 1 is energized 2 The sliding plate is moved to press the 1st transfer rollers up against the transfer belt which blocks the retraction position sensor 1 3 After the lapse of a predetermined period of time after the retraction position sen sor 1 has been blocked the pressure retraction clutch 1 is de energized B Retraction position control The pressure and retraction operation of the 1st transfer roller is controlled as the retrac tion position sensor 1 detects the movement of the sliding plate 1 The pressure retraction clutch 1 is energized 2 Thesliding plate is moved to retract the 1st transfer rollers from the transfer belt As a result the retraction position sensor 1 which has been blocked is now unblocked 3 After the lapse of a predetermined period of time after the retraction position sen sor 1 has bee
138. ox has the dividing screens 3 Waste toner conveyed to the rear end of the box is conveyed up to the detection window by the agitating blade When the waste toner conveyed to the detection window blocks the waste toner sensor the waste toner near full condition is detected Top view Waste toner sensor PS11 1st conveyance screw 2nd conveyance screw Detection window Agitating blade A011T2C048DA Dividing screens 58 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 15 Waste toner collecting section 15 3 9 Waste toner near full condition detection control A waste toner near full condition is detected when the waste toner sensor continuously blocks for a predetermined period of time e At this time a waste toner near full condition warning is given on the panel Approx 1000 printed pages can be produced at 20 coverage with use of standard originals during the period of time that begins when a near life condition is detected and ends when a life condition is detected d Color P325 P330 When the sensor is unblocked When the sensor is blocked Detection window A011T2C049DA READY WASTE TONER NEAR FULL w for help Composition Operation A011T2E077DA 15 3 10 Waste toner full condition detection control A waste toner full conditi
139. p trol mode is deactivated At the end of a print cycle of At the end of a job When the Simplified correction given conditions front right door is closed control Composition Operation e When the power switch is Complete correction turned ON control Special Whenialitraysaetembt Power the switch is turned Complete correction situation ysg Ply ON control User When engine engine service When engine engine service Complete correction selection calibration is selected calibration is selected control 1 Since the main body is not provided with a function that detects a new transfer belt unit engine engine service calibration must be selected and complete correction control executed whenever the unit has been replaced with a new one 2 See the following for the conditions that enable execution of the stabilization control at the end of a print cycle of given conditions When a malfunction is reset 21 1 5 Conditions enabling execution of stabilization control at the end of a print cycle of given conditions The time equivalent to the number of printed pages produced by each TC is counted after the execution of the last image stabilization sequence The equivalent time counter of all TCs is reset after the execution of the image stabiliza tion sequence A Calculation of equivalent printed page time The period of time through which the developing unit is driven is used for the equivalent printed page time Half
140. peration Ver 1 0 Nov 2006 E Ordinary start control ls The temperature adjustment is started with the target temperature of the fusing heater lamp 1 set at 170 C At the same time the temperature adjustment is started with the target temperature of the fusing heater lamp 2 set at 150 C If the heating roller temperature reaches a level of 120 C or more both the fusing pressure roller and fusing belt are turned at the specified speed Or when a prede termined period of time elapses the fusing pressure roller and fusing belt are turned at the specified speed If the control has proceeded from low temperature start control the fusing pres sure roller and fusing belt are turned at the specified speed when the main body has already detected the completion of the finisher s initial operation For the main body with the duplex unit the conveyance motor is also turned at the same time If the heating roller temperature becomes 165 C or more and the fusing pressure roller temperature becomes 70 C or more after the lapse of a predetermined period of time after the fusing unit rollers and belt have been rotated the fusing Ready state is set in this bout the conveyance motor rotation is stopped If a print request is received after the fusing ready state the control proceeds to print control print start control Fusing motor M4 Fusing heater lamp 1 H1 remote Fusing heater lamp 2 H2 remote LOW Temperature C
141. r the period of time that begins when a print cycle starts and ends when a predeter mined period of time elapses after the print cycle has been completed Forthe period of time when the thermistor 3 TH3 provided in the print head detects the temperature of 42 degrees or more Half speed rotation conditions The motor runs at a half speed during any time other than above The door is opened during the warm up cycle However the motor does not run at a half speed when image stabilization sequence is being executed even if a door is opened during the warm up cycle Stop conditions e Stopped in the power save mode However the motor is not stopped for a predetermined period of time after a print cycle has been completed The temperature of the heating roller is below the specified one Forced stop condition Forthe period of time that begins when the warm up cycle is started and ends when the warm up cycle is complete e A malfunction occurs but not when an error occurs 108 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 22 Miscellaneous C Ozone ventilation fan motor Full speed rotation conditions Atthe start of a warm up cycle During a print cycle During when the image stabilization control is performed e For the period of time when the thermistor 3 provided in the print head detects the tem perature of 42 degrees or more d Color P325 P330 Stop conditions A
142. ration roller clutch Registration sensor Registration sensor PS4 CL2 ON PS4 OFF Registration roller clutch Registration sensor Registration sensor PS4 CL2 ON PS4 OFF Media feed sensor Media feed sensor PS2 Media feed sensor PS2 Tray 3 PS2 Tray 3 ON OFF Media source Starting point Ending point Lower feeder unit Registration roller clutch Media feed sensor PS2 Registration sensor PS4 CL2 ON OFF Media feed sensor Media feed sensor PS2 Media feed sensor PS2 Lower feeder unit Registration roller clutch Media feed sensor PS2 Registration sensor PS4 CL2 ON OFF Duplex unit No media length is detected cs e ol as o Q o e 2 O 2 e 9 f there is a mismatch between the media size setting and the results of media size detection the main body suspends the print cycle and displays the message or PAPER ERROR on the panel The media that has caused size error is fed out of the main body after going through the 2nd transfer and fusing processes The subsequent sheets of media are subjected to the following operation Media state Print operation Exit operation Media type error Print Exit Subsequent sheets Yet to be printed Ead Print Exit e The size error display can be reset when the power switch is turned OFF and ON or by a reset command media size error reset f a media size error is detected during 2 sided printing
143. rd from the wall outlet Drum cleaner isopropyl alcohol and roller cleaner ace tone based are highly flammable and must be handled with care A risk of fire exists Do not replace the cover or turn the product ON before any solvent remnants on the cleaned parts have fully evaporated A risk of fire exists 5 10 Theory of Operation Y108600 3 SAFETY AND IMPORTANT WARNING ITEMS Handling of Service Materials N CAUTION Use only a small amount of cleaner at a time and take care not to spill any liquid If this happens immediately wipe it off A risk of fire exists When using any solvent ventilate the room well Breathing large quantities of organic solvents can lead to discomfort Y108600 3 Theory of Operation 5 11 SAFETY AND IMPORTANT WARNING ITEMS 4 Used Batteries Precautions ALL Areas CAUTION Danger of explosion if battery is incorrectly replaced Replace only with the same or equivalent type recommended by the manufacturer Dispose of used batteries according to the manufacturer s instructions Germany VORSICHT Explosionsgefahr bei unsachgemaBem Austausch der Batterie Ersatz nur durch denselben oder einen vom Hersteller empfohlenen gleichwertigen Typ Entsorgung gebrauchter Batterien nach Angaben des Herstellers France ATTENTION Il y a danger d explosion s il y a remplacement incorrect de la batterie Remplacer uniquement avec une batterie du m me type ou d un type quivalent re
144. regulatory requirements for the area Use of inadequate cord set leads to fire or electric shock e Attach power plug which meets the following criteria having configuration intended for the connection to wall outlet appropriate for the product s rated voltage and current and the plug has pin terminal s for grounding and meets regulatory requirements for the area Use of inadequate cord set leads to the product connect ing to inadequate power supply voltage current capacity grounding and may result in fire or electric shock Conductors in the power cable must be connected to ter minals of the plug according to the following order Black or Brown L line White or Light Blue N neutral aD Green Yellow PE earth Wrong connection may cancel safeguards within the product and results in fire or electric shock Y108600 3 Theory of Operation 5 3 SAFETY AND IMPORTANT WARNING ITEMS 3 CHECKPOINTS WHEN PERFORMING ON SITE SERVICE OLIVETTI brand products are extensively tested before shipping to ensure that all applicable safety standards are met in order to protect the customer and customer engi neer hereafter called the CE from the risk of injury However in daily use any electrical equipment may be subject to parts wear and eventual failure In order to maintain safety and reliability the CE must perform regular safety checks 1 Power Supply Connection to Power Supply NWARNING
145. request for energizing the intermediate transport motor Such a request is hon ored after the backward rotation control is completed The backward rotation control is not executed at high temperatures A Operation timing The 1st transfer belt backward rotation is performed after a predetermined number of printed pages are produced after the execution of the last backward rotation control 44 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 13 Transfer section 1st transfer 13 3 9 Toner collecting port shutter mechanism Ashutter mechanism is provided to prevent waste toner from being spilled from the toner collecting port when the waste toner box is removed and reinstalled Placing the shutter lever in the locked position to the front side of the main body closes the shutter of the toner collecting port e The transfer belt unit can be removed after removing the waste toner box closing the shutter of the toner collecting port and removing the fixing screws A preventive mechanism works to stop the transfer belt unit from being removed with the toner collecting port opened Due to the shutter lever interfering with the suction trans port unit the transfer belt unit cannot be removed until the shutter lever is placed in the locked position Similarly to install the transfer belt unit the shutter lever needs to be placed in the locked position so that the shutter lever will not interfere with the suction
146. rs 64 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 17 Media feed section Tray 2 17 Media feed section Tray 2 17 1 Composition d Color P325 P330 A011T2C506AA A011T2C509AA Feed roller Empty sensor actuator Composition Operation roller Edge guide plate 4138t02603c0 Media feed clutch 2 Media level indicator lever 4138t02600c1 Y108600 3 Theory of Operation 65 17 Media feed section Tray 2 Theory of operation Ver 1 0 Nov 2006 17 2 Drive d Color P325 P330 Feed roller 4138t02058c0 17 3 Operation 17 3 1 Media lift plate mechanism The media lift plate is pressed down into the locked position in which the media is loaded in position Load a media stack and then slide the tray into the main body This causes the lock release lever to unlock the media lift plate The media lift plate media stack is pressed against the feed roller The media lift plate media stack is pressed upward by the springs at all times cs e on o Q o ie cs e 72 O 2 E e 9 Media lift plate Media lift plate Feed roller Lock release lever 4138t02605c0 66 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 17 Media feed section Tray 2 17 3 2 Media separation mechanism Drive from the intermediate transport motor
147. rt Staple finisher Composition Operation Transport rollers 1 and 2 transport 1 sided printed media and 2 sided printed media to be fed out of the main body to the finisher section The 1 sided printed media to be subjected to the second print process is not transported to the finisher section but is switched back into the main body Media transport is accomplished by the drive of the fusing motor of the main body If the optional duplex option is mounted on the main body media transport is accom plished by the drive of the reverse motor built into the duplex option The transport unit is not provided with any sensors for detecting the transport condition of the media The entrance sensor of the finisher section performs the function of detect ing the transport condition of the media Transport roller 1 Transport roller 2 A01FT2C006DA Finisher section Transport unit section Main body Transport roller 2 Transport roller 1 A01FT2C007DA A01FT2C008DA AO1FT2C009DA Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 5 Operations 5 1 2 Transport roller drive mechanism For the 1 sided printed media and 2 sided printed media the motor drive force rotates the transport rollers 1 and 2 in the forward direction via a torque limiter thereby trans porting the media in the fo
148. rt shutter Then toner can be replenished from the toner cartridges Moving the print unit release lever to the right or left accompanies the synchronizing movement of the slider This makes the shutter opened or closed To prevent the front door from getting closed while the shutter is open the preventive mechanism works in the way that the front door cannot be closed by interfering with the release lever until the release lever is placed in the locked position to the left in the pic ture d Color P325 P330 Closed OI Shutter CI Opened eoe cs e ol as o Q o e 2 O 2 e 9 Release lever A011T2C010DA A011T2C021DA Y108600 3 Theory of Operation 33 12 Print unit section developing Theory of operation Ver 1 0 Nov 2006 12 2 3 Toner flow 1 Toner stored in the toner cartridge is agitated by the agitating blade and conveyed onto the front side of the toner cartridge by the conveyance screw 2 Toner conveyed onto the front side of the toner cartridge is conveyed through the toner collecting port and then conveyed to the print unit collecting port 3 The toner conveyed to the collecting port is conveyed into the toner chamber by the replenishing screw 4 The toner level detection system provided on the front side of the developing unit the sensor is mounted on the main body side detects at this time the level of toner still ava
149. rward direction For the media to be subjected to the first print process the motor drive force rotates the transport rollers 1 and 2 in the forward direction via a torque limiter thereby transporting the media in the forward direction When fusing of the first print process is completed the motor starts rotating in the backward direction turning transport rollers 1 and 2 in the backward direction The media is thereby subjected to the switchback operation in which the media is fed backward 5 1 3 Transport roller slip mechanism The drive force of the transport roller is transmitted via a torque limiter During forward rotation the torque limiter transmits drive to the transport roller at all times During backward rotation on the other hand the torque limiter causes the trans port roller to slip that is turn idly when a force equivalent to or more than a predeter mined value is applied in the forward direction Under special conditions during a 2 sided print process at a time when the trailing edge of a sheet of media is yet to reach transport roller 2 transport rollers 1 and 2 start rotat ing backward for the subsequent sheet of media so that it can be returned backward The leading edge of the media reaches the transport roller in the finisher section The trans port roller then attempts to transport the media in the forward direction As a result trans port forces in two directions in the forward and backward direction are app
150. s opened C Control start decision Either of the following two controls with a different target temperature is performed depending on the temperature detected by the temperature humidity sensor TEM HUMS e If the information provided by the temperature humidity sensor is less than a predeter mined value the low temperature start control is provided e If the information provided by the temperature humidity sensor is the predetermined value or more the ordinary start control is provided cs e ol as o Q o e 2 O 2 e 9 D Low temperature start control 1 Temperature adjustment is started with the target temperature of the fusing heater lamp 1 set at 80 C correction value 2 The control proceeds to ordinary start control after the lapse of a predetermined period of time after the heating roller temperature has reached the target value mor nn Fusing heater lamp 1 FH1 HI re EN LOW Temperature control Temperature control Fusing heater lamp 2 FH2 HI remote LOW EE Temperature control Temperature control Temperature C Heating roller Fusin Pressure roller Warm up start Fusing unit rollers Fusing ready and belt start A011T2E071DA Warm up cycle control diagram during low temperature start Y108600 3 Theory of Operation 95 d Color P325 P330 e on o Q o ie cs e 72 O 2 E e 9 20 Fusing section Theory of o
151. sing section Theory of operation Ver 1 0 Nov 2006 20 3 8 Proactive control To shorten the time period that begins when a print request is accepted and ends when a copy is printed out the proactive rotation of the fusing motor is controlled A Control start timing A print request is received d Color P325 P330 B Control termination timing e After the lapse of a predetermined time at the start of a print cycle when a malfunction occurs or at the start of the power save mode C Control operation timing 1 The fusing pressure roller and the fusing belt are rotated at the specified speeds 2 lfaprint start request is accepted during the proactive control the control proceeds to print control 3 Ifa malfunction or media misfeed occurs or a power save request is made during the proactive control the control proceeds to heater OFF control 20 3 9 Print control To ensure a good fixing level and light transmission performance of the OHP transparen cies the fusing speed fusing pressure roller temperature and fusing belt temperature are controlled A Control start timing A print request is received cs e n o Q o e 72 O 2 E e 9 B Control termination timing e A malfunction or media misfeed occurs C Control operation timing 1 The fusing pressure roller and fusing belt are turned at the specified speed 2 The temperature adjustment is started with the tar
152. ssively low halftone reproducibility becomes poor This control detects a Vpp range in which no image failure occurs to set the optimum Vpp Developing bias Vpp control Composition Operation Developing bias duty control control of the maximum amount of toner sticking to the transfer belt To correct the target amount of toner sticking to the transfer belt to form the solid image To correct the target level of fluctuations in fine line reproduction and Laser light intensity con reverse image white on black reproduction that occur due to variations trol in photo conductor electrostatic characteristics developing characteris See P 14 tics and transfer characteristics part to part variations environment durability To correct the tone by using the IDC sensor to measure the density of a gradation pattern produced on the transfer belt and sending the results of the measurement to the controller Gamma characteristics detection control Registration correction control See P 14 To correct incorrect color registration that occurs due to variations in parts of the main body used for regulating different drawing positions Y108600 3 Theory of Operation 103 21 Image stabilization control Theory of operation Ver 1 0 Nov 2006 21 1 2 Simplified correction control e f the simplified correction control is not effective in making a good correction the com plete correction control is executed J Control
153. sub tray transport section Transporting media from the main body rd AO1FT1C001AA Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 3 Composition Composition Operation 3 Composition Staple finisher Sub tray section Sub tray transport section Transport unit Storage section Main tray section Staple section A01FT2C001DA Composition Operation Finisher Transport unit AO1FT2C001AA AO1FT2C002AA Main tray section Sub tray section A01FT2C002DA AO1FT2C003AA Y108600 3 Theory of Operation 5 4 Drive Theory of operation Ver 1 0 Nov 2006 4 Drive Staple finisher Composition Operation Main tray drive section EEE Media ejector drive section Nesen sg v A01FT2C003DA 6 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 5 Operations 5 Operations 5 1 Transport unit section The transport unit controls transport of media fed out from the main body switchback operations for the media during 2 sided printing and drive for feeding media out into the finisher section A01FT2C004DA A01FT2C002AA Transport drive mechanism Transport roller 2 A01FT2C005DA Y108600 3 Theory of Operation Staple finisher c e o Q o e 72 9 Q E e 9 5 Operations Theory of operation Ver 1 0 Nov 2006 5 1 1 Media transpo
154. surface loosen two screws that secure the refer ence position adjusting plate 3 Slide the reference position adjusting plate as necessary as indicated on the scale 4 From the bottom surface of the tray tighten the two screws that secure the refer ence position adjusting plate 5 Through the hole in the media lift plate on top of the tray tighten the two screws that secure the edge guide plate Media lift plate Edge guide plate fixing screws 4138t02125c0 Adjustment scale Reference position adjusting plate 4138t02123c0 Reference position adjusting plate fixing screws 4 1 11 Media misfeed detection control e f the media feed sensor is not activated within a predetermined period of time after a media feed sequence has been started the main body determines that there is a media misfeed It then displays a media misfeed message on the panel The media misfeed display can be reset by opening and closing any door 10 Theory of Operation Y108600 3 Color Printer Staple Finisher THEORY OF OPERATION Code Y108600 3 Revision history After publication of this service manual the parts and mechanism may be subject to change for improvement of their performance Therefore the descriptions given in this service manual may not coincide with the actual machine When any change has been made to the descriptions in the service manual a revised version will be issued
155. the IDC sensor to prevent it from being dirtied The shutter is opened or closed in synchronism with the pressure or retraction motion of the 2nd transfer roller When the 2nd transfer roller is pressed the pressure cam pushes up the sensor lever which opens the shutter above the IDC sensor When the 2nd transfer roller is released the shutter above the IDC sensor is closed by the tension of a spring Shutter cs e ol as o Q o e 2 O 2 e 9 Pressure cam 4138t02551c0 4138t02577c0 Pressure cam Y108600 3 Theory of Operation 73 d Color P325 P330 e o Q o e 2 Q 2 E e 9 19 Conveyance section Registration roller Theory of operation Ver 1 0 Nov 2006 19 Conveyance section Registration roller 19 1 Composition A011T2C503AA 4138t02096c0 Media loop sensor PS6 Charge neutralizing cloth 2nd transfer roller Registration roller Registration roller clutch CL2 Registration sensor PS4 OHP sensor PS7 Temperature humidity sensor TEM HUMS N 4138t02097c0 Intermediate transport Q Transfer roller unit motor M3 19 2 Drive Pressure retraction clutch 2 CL5 Registration roller clutch CL2 4138t02098c0 Registration roller 74 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 19 Conveyance section Registr
156. the crosswise direction Media aligning is accomplished by the align motor and the aligning plate A Aligning plates The aligning plates are moved to the front or rear in accordance with the media size The aligning plate home position sensor controls the position of aligning plate Staple finisher Aligning plate Stopper Aligning plate home position sensor PS6 Align motor M2 cs e n o Q o ie cs e 72 O 2 E e 9 A01FT2C046DA B Media aligning sequence Ina mode in which media is fed straight out without involving shift or stapling operation the media is fed out centrally e Inthe shift stapling mode the aligning plate pushes the media about 30 mm toward the front Aligning plate Media feed direction q Center Feeding media straight out lt Shift Staple mode A01FT2C047DA 24 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 5 Operations 5 4 5 Exit mechanism The printed media stack set aligned in the storage section is fed out into the main tray The aligning belt is moved up or down by the aligning belt up down solenoid The media ejector belt is driven by the media ejector motor The media level lever is driven by the media level lever solenoid The paddle is driven by the paddle solenoid and exit motor Staple finisher a i Media level lever NI 7 3 Media ejector 7 f c VS
157. the main body determines that there is a media misfeed and stops operating Y108600 3 Theory of Operation 81 19 Conveyance section Registration roller Theory of operation Ver 1 0 Nov 2006 19 3 9 Conveyance system media misfeed detection control Inthe feeding section a specific sensor is assigned for each media source Based on the time elapsed before the sensors become activated misfeed is detected e A specific sensor is assigned for each section of the conveyance system to detect a media misfeed that could occur along the path e When a media misfeed is detected the main body suspends the print cycle and gives the message PAPER JAM on the panel The main body thereafter attempts to detect any sheet of media left inside it d Color P325 P330 Exit sensor PS8 Media loop sensor PS6 Duplex unit feed sensor ADCB Registration roller Registration roller clutch CL2 Registration sensor PS4 cs e n o Q o e 72 O 2 E e 9 Media feed sensor PS3 4138t02104c1 82 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 19 Conveyance section Registration roller Misfeed type Misfeed detection starting point Misfeed detection condition Feed clutch 1 CL1 ON Registration sensor PS4 not acti Feed clutch 2 CL3 ON vated within a predetermined time Media feed sensor PS2 Tray 3 not Feed clutch CL1 Tray 3 ON activated within a pred
158. timage transfer A DC positive voltage is applied to the backside of the transfer belt thereby allowing the visible developed image on the surface of each of the PC drums Y M C and K to be transferred onto the transfer belt 2nd image transfer A DC positive voltage is applied to the backside of the media thereby allowing the visible developed image on the surface of the transfer belt to be transferred onto the media Media separation The media which has undergone the 2nd image transfer process is neutralized so that it can be properly separated from the trans fer belt 9 Transfer belt cleaning The residual toner left on the surface of the transfer belt is scraped off 10 PC drum cleaning The residual toner left on the surface of the PC drum is scraped off Y108600 3 Theory of Operation 7 5 Image creation process Theory of operation Ver 1 0 Nov 2006 o e e A aa tol Q eo Aa _ 2 o Q Blank Page Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 6 Overall composition Composition Operation 6 Overall composition 6 1 Timing chart at main body powerup d Color P325 P330 Conditions A4S plain paper 2 printed pages job Polygon motor M8 LD Intermediate transport motor M3 Color PC drum motor M2 Developing os motor YMC M1 Developing motor K M5 Charge K Charge YMC Developing Y cs e ol n o Q o e
159. tion Ver 1 0 Nov 2006 11 Print unit section charge corona 11 1 Composition d Color P325 P330 A011T2C508AA Grid mesh Electrode A011T2C018DA on o Q o 72 Q 2 E e 9 Charge corona A011T2C017DA 28 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 11 Print unit section charge corona 11 2 Operation 11 2 1 Charge corona unit ON OFF control Polygon motor M8 semiconductor laser d Color P325 P330 Intermediate transport motor M3 Color PC drum motor c M2 Developing motor Y M C M1 Developing motor K M5 Charge K A011T2E063DA 11 2 2 Output during pre process e Color mode The charge corona voltage for all colors of toner is applied after rotation of the color PC drum motor has stabilized e Monochrome mode The charge corona voltage for K is applied after rotation of the inter mediate transport motor has stabilized Image formation is possible for the area to which the charge corona voltage is applied cs e ol as o Q o e 2 O 2 e 9 11 2 3 Output during post process The output of the charge corona voltage is shut down when the entire exposed area of the photo conductor moves past the charge corona section after the 1st transfer process has been completed Y108600 3 Theory of Operation 29 d Color P3
160. tmost care A DANGER Action having a high possibility of suffering death or serious injur AAN WARNING Action having a possibility of suffering death or serious injury N CAUTION Action having a possibility of suffering a slight wound medium trouble and property damage Symbols used for safety and important warning items are defined as follows Precaution when servicing the A AA N zx product General Electric hazard High temperature precaution Prohibition when servicing the Q Q Q product General Do not touch Do not prohibition with wet hand disassemble Direction when servicing the Q e Q product General Unplug Ground Earth instruction Y108600 3 Theory of Operation S 1 SAFETY AND IMPORTANT WARNING ITEMS SAFETY WARNINGS 1 MODIFICATIONS NOT AUTHORIZED BY KMBT INC OLIVETTI brand products are renowned for their high reliability This reliability is achieved through high quality design and a solid service network Product design is a highly complicated and delicate process where numerous mechanical physical and electrical aspects have to be taken into consideration with the aim of arriving at proper tolerances and safety factors For this reason unauthorized modifications involve a high risk of degradation in performance and safety Such modifications are therefore strictly prohibited the points listed below are not exhaustive but they illustrate the reason ing behind this policy Prohibited Actio
161. toner can be conveyed to the main body Moving the print unit release lever to the right or left accompanies the synchronizing movement of the slider This makes the gear connected to the shutter rotated and then makes the shutter opened or closed To prevent the front door from getting closed while the shutter is open the preventive mechanism works in the way that the front door cannot be closed by interfering with the release lever until the release lever is placed in the locked position to the left in the pic ture Slider Close NS a Shutter Release lever A011T2C010DA A011T2C011DA Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 8 Toner supply section 8 3 4 Toner replenishing mechanism The toner supply motor is energized according to the condition of the toner level sensor for each color of toner Toner is then supplied from the toner cartridge to the print unit as necessary A single toner supply motor is turned either forward or backward to accomplish supply of toner of two different colors one motor is for Y and M and the other for C and K That is M K toner cannot be supplied while Y C toner is being supplied Toner is supplied only while the print unit is being driven This is because of the following reason if toner is supplied from the toner cartridge while the print unit remains stati
162. tor M1 4537102502c1 Transport motor M1 S ied m Energized De energized Media feed sensor PS2 Joco NN NE o Media feed clutch CL 1 4537T2C003DA Y108600 3 Theory of Operation 5 Lower feeder unit cs e ol n o Q o e 2 O 2 E e 9 4 Operations Theory of operation Ver 1 0 Nov 2006 4 1 3 Media separation mechanism E e A separation roller provided with a torque limiter is used to prevent double feeding of E media o 2 o o Feed roller Separation roller 4138t02115c0 4 1 4 Media detection mechanism The media feed sensor detects the media fed in by the feed roller When two lower feeder units are installed the sensor detects the media fed off from tray 3 e When the media feed sensor actuator unblocks the media feed sensor the main body considers that the media has reached the sensor position cs e on o Q o e 72 O 2 E e 9 Actuator Media feed sensor PS2 Media Tray 1 41880021160 Media Tray 2 3 6 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 4 Operations 4 1 5 Media supply level detection control There is a window in the front cover of the cassette for indicating the media supply level e When the media lift plate goes up a red lever appears in the window The lower the level of the media stack in the tray the more red that is visib
163. uct employs a Class 3B laser diode that emits an invisible laser beam The laser diode and the scanning polygon mirror are incorporated in the print head unit The print head unit is NOT A FIELD SERVICEABLE ITEM Therefore the print head unit should not be opened under any circumstances Laser Aperture of the Print Head Unit A011P0C501DA Y108600 3 Theory of Operation 5 13 SAFETY AND IMPORTANT WARNING ITEMS U S A Canada CDRH Regulation This machine is certified as a Class 1 Laser product under Radiation Performance Stan dard according to the Food Drug and Cosmetic Act of 1990 Compliance is mandatory for Laser products marketed in the United States and is reported to the Center for Devices and Radiological Health CDRH of the U S Food and Drug Administration of the U S Department of Health and Human Services DHHS This means that the device does not produce hazardous laser radiation The label shown on page S 16 indicates compliance with the CDRH regulations and must be attached to laser products marketed in the United States CAUTION Use of controls adjustments or performance of procedures other than those specified in this manual may result in hazardous radiation exposure semiconductor laser Maximum power of the laser diode 15 mW Wavelength 770 800 nm All Areas CAUTION Use of controls adjustments or performance of procedures other than those specified in this manual may result in haz
164. unit cs e ol as o Q o e 2 O 2 e 9 2nd conveyance screw Waste toner collecting screw ra Waste toner bottle Suctiion transport unit MEO 1st conveyance screw Waste toner bottle Y108600 3 Theory of Operation 55 d Color P325 P330 e o Q o ie cs e 72 O 2 E e 9 15 Waste toner collecting section Theory of operation Ver 1 0 Nov 2006 15 3 3 Toner collecting port shutter mechanism at the suction transport unit A dual shutter is used to prevent waste toner from being spilled from the toner collecting port when the waste toner box is removed and reinstalled e Placing the box lock lever of the waste toner box in the locked position the 9 o clock position closes the first shutter of the toner collecting port e Removing the waste toner box closes the second shutter A011T2C041DA A011T2C042DA 15 3 4 Toner collecting port shutter mechanism of the waste toner bottle Ashutter is used to prevent waste toner from being spilled from the toner collecting port when the waste toner box is removed and reinstalled Placing the box lock lever of the waste toner box in the locked position the 9 o clock position closes the shutter of the toner collecting port Box lock lever Box lock lever A011T2C043DA A011T2C044DA 56 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 15 Waste toner
165. use a specified one Current that can flow in the extension cord is limited so using a too long extension cord may result in fire Do not use an extension cable reel with the cable taken up Fire may result 2 Installation Requirements Prohibited Installation Places N WARNING Do not place the product near flammable materials or vola tile materials that may catch fire A risk of fire exists Do not place the product in a place exposed to water such as rain A risk of fire and electric shock exists When not Using the Product for a long time When the product is not used over an extended period of time holidays etc switch it off and unplug the power cord Dust collected around the power plug and outlet may cause fire Y108600 3 5 6 Theory of Operation SAFETY AND IMPORTANT WARNING ITEMS The product generates ozone gas during operation but it will not be harmful to the human body If a bad smell of ozone is present in the following cases ventilate the room a When the product is used in a poorly ventilated room b When taking a lot of copies c When using multiple products at the same time Stability N CAUTION Be sure to lock the caster stoppers In the case of an earthquake and so on the product may slide leading to a injury Inspection before Servicing NCAUTION Before conducting an inspection read all relevant docu mentation service
166. v 2006 8 Toner supply section 8 Toner supply section 8 1 Composition vr A011T2C501AA A011T2C005DA TC detection board CSIC CoO LE LE CI CI CI CI LJ A011T2C006DA Conveyance screw Toner collecting port Agitating blade A011T2C007DA Conveyance screw Y108600 3 Theory of Operation 18 d Color P325 P330 cs e ol o Q o e 72 9 Q E e 9 8 Toner supply section Theory of operation Ver 1 0 Nov 2006 8 2 Drive Front view Toner supply motor C K M7 Toner supply motor Y M M6 N e BANG B SE oa NI 4138t02599c0 d Color P325 P330 3D view Toner supply motor C K M7 Toner supply motor Y M M6 cs e on o Q o e 72 fe Q E e 9 16 Theory of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 8 Toner supply section 8 3 Operation 8 3 1 Toner cartridge capacity There are three different types of toner cartridges which contain a different toner amount Toner cartridges shipped with main body Quantity equivalent to 3 000 printed pages Not equipped with TC detection board e Standard capacity toner cartridges Quantity equivalent to 6 000 printed pages High capacity toner cartridges Quantity equivalent to 1
167. with a revision mark added as required Revision mark To indicate clearly a section revised show to the left of the revised section A number within AA represents the number of times the revision has been made To indicate clearly a section revised show A in the lower outside section of the correspond ing page A number within A represents the number of times the revision has been made NOTE Revision marks shown in a page are restricted only to the latest ones with the old ones deleted When a page revised in Ver 2 0 has been changed in Ver 3 0 The revision marks for Ver 3 0 only are shown with those for Ver 2 0 deleted When a page revised in Ver 2 0 has not been changed in Ver 3 0 The revision marks for Ver 2 0 are left as they are Theory of operation Ver 1 0 Nov 2006 CONTENTS Staple finisher Outline 1 Prod ct sp cification Stea tn OO OO AE ana Uo d 1 2 ere EG ee EE EEE E HR 4 2 1 Feeding media to the main tray ccccccceeeeeeeeeeeeeeeneeeeaeeeeeeeeeeeeeeteeeeneeaaaeeees 4 2 2 Feeding media to the sub tray nennnaneeeeeeeeee 4 Composition Operation 3 Felg Ge EE un sa ap Ene c A uM ta IL 5 4 Buc 6 5 lr x 7 5 1 Transport unit section iius naos so o Roa ai scis Ets rend e n eise ii 7 5 1 1 Media transport T ER 8 5 1 2 Transport roller drive mechanism
168. y of Operation Y108600 3 Theory of operation Ver 1 0 Nov 2006 12 Print unit section developing 12 2 4 Developing system Two types of developing systems are used a non contact developing system and an alternating current application system 1 Anegative charge supply bias voltage Vr is applied the supply roller to regulate the amount of toner sticking to the developing roller 2 Anegative charge blade bias voltage Vb1 is applied to the regulator blade 1st to negatively charge the toner and form a thin layer of toner 3 Toner on the surface of the developing roller is evened out by the regulator blade 2nd 4 During development DC AC developing bias voltage Vb is applied to develop ing roller The AC component of the developing bias voltage is applied only during development At any time other than the development only the DC component of the developing bias voltage is applied 5 Toner sticks to the photo conductor when the AC component of the developing bias voltage Vpp is negative The voltage and time length of the negative component Vpp determines the image density 6 Anegative charge charge neutralizing bias voltage same potential as the develop ing bias is applied to the charge neutralizing sheet to neutralize any toner left on the surface of the developing roller The neutralized toner is returned to the supply roller d Color P325 P330 Charge neutralizing sheet Photo conductor cs e o

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