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Service Manual 2

1. outputs Output Voltage Use Remarks CH 1 30 KV Voltage applied to charging roller DB 240 V 300 V Voltage applied to developing roller SB 360 V 450 V Voltage applied to toner supply roller TR 4 KV 1 3 kV Voltage applied to Variable transfer roller CB 400 V Voltage applied to cleaning roller 3 Photosensor The photosensor mounted on this power sensor board supervises the paper running state during printing Figure 2 3 shows the sensor layout diagram Paper running direction Outlet sensor Heat roller Tratefer roller Toner sensor Paper sensor Registration roller Inkt sensor2 Inkt sensor 1 Paper end sensor Ho roller Figure 2 3 Sensor Function Sensing state Inlet sensor 1 Detects the leading part of the paper and gives the supervision timing for switching from hopping operation to feeding opera tion Supervises the paper running state and the paper size accord ing to the paper reach time and running time ON Paper exists OFF No paper exists Inlet sensor 2 Detects the form width ON A4 or larger OFF Smaller than A4 Paper sensor Detects the leading part of the paper Supervises the paper running state ON Paper exists OFF No paper exists Outlet sensor Supervises the paper feed and size according to the time of arrival to the sensor and the time of passage of paper ON Paper exists
2. T DRUM CNT EI Menu Press the 4 orb key Writing into the EEPROM is performed LL m when the Enter key is pressed Menu press the 4 key Writing into the EEPROM is performed when the Enter key is pressed 0 25 mm intervals Press the Jn Y ADJUST 4 key Writing into the EEPROM is performed 0 mm when the Enter key is pressed 0 25 mm intervals ON LINE key 964 1 2 System maintenance mode 4 1 2 System maintenance mode The system maintenance mode is set when the power is turned ON while pressing the Recover key This mode adopts the menu for function selection The system maintenance mode is provided with the following functions 1 Page count display The total number of pages counted at the engine is displayed on the LCD 2 Page count printing enable disable This function selects whether to include enable or exclude disable the total number of printed pages counted at the engine at the time of menu printing 8 Rolling ASCII continuous printing The rolling ASCII pattern is printed continuously for various engine tests Press the ON LINE key to cancel this mode 4 Loop test The loop test is for testing the serial I F functions without connecting the printer to a host The data is sent and received by loop back in the loop test The loop test is performed even when any other interface is selected in Menu level 2 Installation of the loop
3. interrupted At the same time the CVOPN signal is sent to the control board to notify it of the off state of the microswitch and the control board performs the cover open processing 962 7 Toner Low Detection 2 7 Toner Low Detection Composition The device consists of the stirring gear which rotates at a constant rate the stirring bar and the magnet on the stirring bar The stirring bar rotates through the link on the protrusion in the stirring gear ied Pro tusion Stirring Bar Stirring Gear Toner Low is detected by monitoring the time interval of the encounter of the magnet set on the sensor lever and the magnet on the stirring bar Operation during toner full state The stirring bar rotates due to the interlocking with the stirring gear Even when the magnet on the stirring bar reaches the maximum height since the other side is being dipped in the toner the stirring bar is pushed by the stirring gear Operation Operation during toner low state When the stirring bar reaches the maximum height since there is no resistance provided by the toner on the other side it falls to the minimum height due to its own weight Be cause of this the time interval during which it is in encounter with the magnet of the sensor lever becomes long By monitoring this time interval toner low can be detected TONER FULL state TOS UO o axipeee gt TONER LOW state TNRSNS a Td Hn t1 5 8 4
4. 3 3 2 AOLT PCB 1 Remove the screw 1 and remove the PCB cover 2 2 Remove three connectors 3 and two screws 4 then remove the AOLT PCB 5 3 3 3 Hopping motor 3 3 3 Hopping motor 1 Remove the front panel assy see 3 3 1 step1 2 Remove the PCB cover see 3 2 2 step1 3 Remove two connectors 1 and two screws 2 then remove the hopping motor assy 3 The three gears 4 the connecting lever 5 as well as the wave washer 6 all come off at the same time so be careful not to lose them 4 Remove two screws 7 and remove the hopping motor 8 963 3 4 Feed roller 3 3 4 Feed roller 1 Remove the front panel assy see 3 3 1 step1 2 Remove the AOLT PCB see 3 3 2 3 Remove the hopping motor assy see 3 3 3 4 Remove the latch on the feed roller gear 1 and remove the feed roller gear 1 b Remove the latch on the feed roller bearing 2 and remove the feed roller bearing 2 6 Shift the feed roller 3 to the right side and lift it out holding it on the left side 963 3 5 Hopping roller rubber 3 3 5 Hopping roller rubber 1 Remove the feed roller see 3 3 4 2 Remove the latch on the hopping roller gear 1 and remove the hopping roller gear 1 The bearing F 2 comes off at the same time so be careful not to lose it 3 Remove the latch on bearing L 3 and remove the bearing L 3 4 Remove the hopping roller 4 and remove the hopping roller rubber 5 from it 963 3 6 Side frame L a
5. 4 Remove the fuser pressure roller release lever see 3 3 19 5 5 Remove two screws 2 and release three locks on the fusing guide Remove the fusing guide 1 by pushing it upward from the lower side 6 Release the engagement with earth plate L BK 3 Lift and remove backup roller 4 At this time two backup roller bearings 5 and two bias springs 6 are also removed 2 P EU fee aaa 77 YY 9 963 3 23 Ep Lock Shaft 3 3 23 EP lock shaft 1 Turn the AC power switch off Unplug the AC power cord from the outlet 2 Remove the main chassis unit see 3 3 17 3 Remove screw 1 Turn EP lock level L Assy 2 in the direction of arrow A 4 Remove spring 3 5 Drop EP lock shaft 4 down and turn in the direction of arrows B and remove it Spring located here EN 3 3 24 Hopping roller Assy 3 3 24 Hopping roller Assy 1 Turn the AC power switch off Unplug the AC power cord from the outlet 2 Remove the main chassis unit See 3 3 17 3 Release the latch Remove hopping roller gear 1 and bearing P 2 Then remove idle gear HF 3 4 Remove the left side of hopping roller shaft 4 from the groove Pull out hopping roller shaft 4 and hopping roller Assy 5 toward the left 5 Release the latch and remove bearing L 6 6 Release the latch and remove hopping roller Assy 5 At this time knock pin 7 is also removed Be careful not to lose the knock pin
6. 6 Remove two screws 5 and remove the separator assy 6 7 Lift the paper stay 7 and disengage it from the separator bracket 8 then remove the separator 9 The spring 0 comes off at the same time so be careful not to lose it 3 3 2 AOLE PCB 3 3 2 AOLE PCB 1 Remove the upper cover see 3 1 1 1 to 3 2 Remove two screws 1 and remove the AOLE PCB 2 3 Remove the connector 3 4 Remove the connector 4 Caution Be careful to set the sensor plate properly when pounting th AOLE PCB Sensor plate 963 3 3 Square shaped connector 3 3 8 Square shaped connector 1 Remove the upper cover and remove the cover frame 5 see 3 3 1 1 to 4 2 Remove the AOLE PCB see 3 3 2 3 Remove the screw 1 and remove the square shaped connector 2 4 Remove the nylon cord 3 from the square shaped connector 2 Confirmation after assembly 1 The square connector 2 should be horizontal to the cover frame 5 3 3 4 Hopping Motor 3 3 4 Hopping Motor 1 Remove the upper cover see 3 3 1 1 to 3 2 Remove the AOLE PCB see 3 3 2 3 Remove two screws 1 then remove the hopping motor 2 3 3 5 Planet gear 3 3 5 Planet gear 1 Remove the upper cover see 3 3 1 1 to 3 2 Remove the AOLE PCB see 3 3 2 3 Remove two screws 1 then remove the motor bracket assy 2 and the planet gear 3 3 3 6 Roller B 3 3 6 Roller B 1 Remove the upper cove
7. Yes Is the connecting cord defective Yes Replace the connecting cord No Replace the operator panel assembly Is the printer recovered No Replace the Control board YES END 967 Communications with the host cannot be performed via the parallel 7 Communications with the host cannot be performed via the parallel interface Is the parallel interface or auto interface selected in menu level 1 No Select the parallel interface or auto interface in menu level 1 Yes 15 the host set to the bidirectional communication Yes Set the parallel I F to the bidirectional communication enable state DISABLE ENABLE in menu level 2 No Set the parallel to the bidirectional communication disable state ENABLE DISABLE in menu level 2 Is the printer recovered Yes END No Is the connector of the parallel interface cable connected to the printer properly No Connect the connector of the parallel interface cable to the printer properly Yes 15 there any defect in the cable broken or bent pin broken wire Yes Replace the parallel interface cable No Replace the Control board or ask the user to check the hardware and software at the host side 968 Data from the host not received via the serial interface 8 Data from the host not received via the serial interface ERROR HOST I F Is message displayed Yes Select the auto interface or RC232C for the host interface in menu level 1 No Do the following items
8. OFF No paper exists Paper end sensor Detect the end of the paper ON Paper exists OFF No paper exists Toner low sensor Detects the lack of toner ON long Toner low exists OFF short No Toner low exists 962 3 Relay Driver Board Aolc Board 2 3 Relay Driver Board AOLC board This board relays signals between the Control board and the Power Sensor board and includes the registration motor and drum motor driver IC 962 4 Electro Photographic Process 2 4 Electro photographic Process 2 4 1 Electro photographic process mechanism This mechanism prints image data from the control board on the paper by electro photographic process The Figure 2 4 shows the layout of the electro photographic process mechanism Fuser Hopping Motor Hopping Roller Registration Motor Drum Motor Image Drum Unit Figure 2 4 1 Image drum unit The image drum unit consists of a sensitive drum a charger and a developer The unit forms a toner image on the sensitive drum using a electrostatic latent image formed by the LED head 2 Hopping motor This motor is a pulse motor of 48 steps rotation that is two phase excited by the signal from the control board It drives the hopping roller of the first tray and the front feed roller via two one way clutches according to the direction of rotation 8 Registration motor This motor is a pulse motor of 48 steps rotation that is two phase excited b
9. Release the latch of fuser pressure roller release lever 1 and pull out it toward the right At this time idle gear H 2 is also removed 6 Remove spring 3 and then remove pressure release lever 4 Be careful do not lose or damage spring 7 Remove EP lock spring 5 and then remove ED lock lever 6 8 Release two latches and remove motor Assy 7 9 1 2 3 4 5 Remove two screws 8 and then remove drum motor 9 and heat sink 0 Remove two screws 10 and then remove registration motor A 3 3 20 Idle Gear 3 3 20 Idle gear 1 Turn the AC power switch off Unplug the AC power cord from the outlet 2 Remove the main chassis unit see 3 3 17 3 Remove the motor Assy see 3 3 19 1 to 8 4 Remove three screws 1 and then remove motor bracket B 2 b Remove idler gear E 3 idle gear D 4 idle gear B 5 idle gear C 6 idle gear A 7 and two resist idle gears 8 3 3 21 Fusing Assy 3 3 21 Fusing Assy Remove the side cover L Assy see 3 3 1 1 to 3 Remove four screws 2 and then remove fusing Assy 3 Unplug connector 1 1 Turn the AC power switch off Unplug the AC power cord from the outlet 2 3 4 963 3 22 Fuser Pressure Roller 3 3 22 Fuser pressure roller 1 Turn the AC power switch off Unplug the AC power cord from the outlet 2 Remove the main chassis unit see 3 3 17 3 Remove the fusing Assy see 3 3 21
10. 2 Remove the stacker cover Assy see 3 3 7 3 Remove four screws 1 Remove stacker mount 2 by releasing the tabs at position 2A 4 Remove stacker full sensor Assy 3 by spreading the plastic tabs on each side of sensor Assy 3 and lifting switch from cover 963 3 10 Cable Cover Cable Guides A And B 3 3 10 Cable cover cable guides A and B 1 Turn the AC power switch off Unplug the AC power cord from the outlet 2 Remove the stacker cover Assy see 3 3 7 3 Remove two screws 1 release tabs at position 1A Remove cable cover 2 cable guide A 3 3 3 11 Eject Roller Assy 3 3 11 Eject roller Assy 1 Turn the AC power switch off Unplug the AC power cord from the outlet 2 Remove the rear cover se 3 3 1 3 Remove the side cover R see 3 3 5 4 Remove the side plate R see 3 3 6 1 to 5 5 Remove the stacker cover Assy see 3 3 7 6 Release the latch on the right side of eject roller Assy 1 Lift up and remove the eject roller Assy 963 3 12 Paper Supply Guide D 3 3 12 Paper supply guide D 1 Turn the AC power switch off Unplug the AC power cord from the outlet 2 Remove the side cover R see 3 3 5 8 Remove four screws 1 Lift up and remove front feeder roller Assy 2 4 Lift up and remove paper supply guide D 3 At this time two bias rollers 4 are also removed Be careful not to lose them b Remove bias spring 5 from the paper supply guide D 3
11. 4PP4076 5717P1 4PP4076 3949P1 4PP4076 5719P1 1PA4076 5430G1 3PP4083 5663G1 m e e 55077511 56730803 56730641 53346701 51607301 53346801 50108001 53345601 961 1 Functions 1 1 Functions This Power Envelope Feeder is installed on the front section of the printer and it supplies paper automatically through the operation of hopping motor which is driven by signals sent from the printer The main functions are the followings Paper that can be used Paper type Phin paper 6 106 x 145 mm 4 64 90 he i 64 126 Se a 961 2 External View and Component Names 1 2 External View and Component Names Link Hopper covar Roller A Upper cover Roller B Paper supporter Paper quide L Appendix D 2 General Mechanism 2 1 General Mechanism The sheet or envelope at the very bottom of the stack is fed into the printer one at a time when the Power Envelope Feeder receives the signal from the printer 1 The hopping motor rotates in the direction of arrow D The planet gear F moves in the direction of arrow G and drives rollers A and B Roller C is linked to pulley which is on the same shaft as roller A and it also turns at the same time as roller A The paper is fed for a predesignated distance until the leading edge reaches roller C 2 Next the hopping motor rotates in the direction of arrow E The planet gear F moves to the
12. See Fig 4 No 15 CN2 connector connected to the Power sensor board No Connectthe CN2 connector to the Power sensor board properly Yes Is Pin 31 HEAT ON signal of the POWER connector of the Control board turned on In normal state this pin is set to O V No Replace the Control board Yes Replace the Power sensor board YES GotoB 5 Synchronous serial I O error ERROR 74 or I F time out between printer and optinal tray ERROR 81 5 Synchronous serial I O error ERROR 74 or I F time out between printer and optinal tray ERROR 81 Is an optional tray 2nd tray or envelope feeder used Yes Is the connection between the Control board and the optional tray connected properly See chapter 7 1 No Connect the cable properly Yes Replace the Control board Is the printer recovered No Isolate the trouble by following the 2nd tray or envelope feeder maintenance manual See appendix C or D YES END No Replace the Control board Is the printer recovered No Replace the Power sensor board YES END 6 I F time out occurs between the printer and the operator panel ERROR 80 6 I F time out occurs between the printer and the operator panel ERROR 80 Is the connecting cord of the operator panel connected to the PANEL connector of the Control board properly See chapter 7 1 No Connect the connecting cord of the operating panel to the PANEL connector of the Control board properly
13. b Hopping front feeder 1 Rotating the pulse motor in the direction b Counter Clock wise direction drives the hopping roller of the front feeder to advance the paper until the inlet sensor turns on At the same time the one way clutch gear A also rotates However the hopping roller of the 1st tray will not rotate due to the one way bearing A cam to push down the front feeder plate is attached on each of the ends of the hopping roller shaft These cams push down the front feeder plate when the hopping operation is not performed So as to facilitate the setting of paper into the tray A microswitch is provided under the front feeder plate to detect that the front feeder plate is at the lower position When the front feeder plate is at the lower position this microswitch causes the motor to stop Hopping Roller Front Feeder Hopping Roller 1st Tray ne vmy Clutch Gear A 2 After turning on the inlet sensor the paper advances further by a predetermined length until it hits the registration roller The skew of the paper can thus be corrected 2 Feeding 2 Feeding After the end of hopping the pulse motor drives the registration roller The registration roller advances the paper until it comes out of the registration roller When leading edge of the paper causes the paper sensor to turn on the printing is started synchronously Hopping Roller 3 Charging 3 Charging Charging is effected by ap
14. replace the power sensor board or inlet sensor t NO Replace the hopping roller shaft assy or paper cassette NO Is the hopping roller shaft rotating YES Setthe paper properly NO Is the stepping motor turning YES Replace the one way clutch gear on the hopping roller shaft assembly NO Is the connector cable being connected properly NO Connect the connector cable properly YES Check the coil resistance approx 4 3y of the stepping motor Is it normal NO Replace the stepping motor YES Replace the AOLT PCB 965 Connection Diagram 5 CONNECTION DIAGRAM 5 1 Interconnection Diagram Hopping motor AOLT PCB 965 2 PCB Layout 5 2 PCB Layout AOLT PCB 966 Parts List 6 00 10 tA UC PARTS LIST No Description 1 AOLD PCB Feed roller Hopping motor Hopping gear Hopping roller assy Feed roller gear Feed roller bearing Feed idle gear Planet gear Table 6 1 High Capacity Second Paper Feeder Part No 4Y A4046 1646G11 3PB4076 5707P1 4PB4076 5718P1 4PB4043 4486P1 4PA4076 5755G1 4PB4043 4488P1 4PP4043 4489P1 4PP4076 5712P1 4PP4043 4491P1 1 Wee Remarks 56408701 56511901 51235001 50407901 51235201 51235301 10 11 12 13 14 15 16 17 AOLT PCB Connector cord Square shaped connector Earth plate Bush Shaft earth plate Paper cassette assy Separator frame assy 4Y A4046 1645G11 4YS4011 4448P3 220A 1866P0141
15. 0 3 6 50922107 release lever 21 EP lock shaft 4PP4076 5047P1 0 3 6 51113301 22 EP lock lever L 4PA4076 5048G1 0 3 6 50807501 assy 23 Inlet sensor lever 3PP4076 5083P1 0 6 12 50807601 24 Paper sensor lever 3PP4076 5082P1 0 3 6 25 Toner sensor lever 4PP4076 5086G1 0 3 6 26 Exit sensor lever 3PP4076 5085P1 0 3 6 50807701 27 Square shaped 220A1866P0220 2 5 10 22P fixed side connector 56730620 28 Paper supply guide 3PA4076 5759G1 0 3 6 51015901 D A4 assy 29 Registration bearing 4PA4076 5756G1 2 6 12 51608501 assy 30 Pressure roller 3PP4076 5032P1 1 3 6 50408101 31 Registration roller 3PB4076 5030P2 1 3 6 80408201 32 Registration gear 4PP4043 4529P 1 1 3 6 51234401 33 Pressure roller gear 4PP4043 4530P1 1 3 6 51234501 34 Fuser pressure 2PB4076 5112P2 1 3 6 50408302 roller A4 35 Fuser pressure 4 4076 5051 1 0 6 12 51608601 roller bearing 36 Bias spring 4PP4043 4388P1 0 6 12 50928501 37 Fusing guide 2PP4076 5021 P1 1 3 6 51016001 38 Idle gear HF 4PP4043 4535P 1 0 3 6 50234601 39 Fusing assy 1YX4076 5100G1 2 10 20 50219901 120Volt Fusing assy 1YX4076 5100G2 2 10 20 50219902 230Volt 40 Exitroller assy Exit roller assy 1 3 6 50408401 41 41 4PP4076 5191G1 1 3 6 53073101 42 Stacker cover assy 2YX4128 1080G1 0 0 6 53073201 43 Washer 4PP4076 5009P1 0 3 6 50516701 44 Fuser pressure 3PP4
16. 14 Front Feeder Roller Assy 3 3 14 Front feeder roller Assy 1 Turn the AC power supply switch off Unplug the AC power cord from the outlet 2 Remove the manual feed hopper Assy see 3 3 4 3 Remove the side cover R see 3 3 5 4 Remove the front feeder roller Assy see 3 3 12 1 to 3 5 Remove the paper supply guide A see 3 3 13 1 to 10 6 Remove idle gear 1 and then remove the right side front feeder cam 2 release lever R 3 and spring 4 At this time knock pin 5 and bearing F are also removed Be careful not to lose them Do not mix these parts with those from the left side of Assy 7 Pull out the front feeder 7 shaft toward the left and then remove front feeder roller Assy 8 8 Remove knock pin 9 and then remove front feeder cam D on the left L side release lever L A and spring B At this time the bearing C on the left L side is also removed Do not mix these parts with those from the right side of Assy mes e Note 1 Hopping roller orientation when removed from shaft 2 Be sure sensor arm swings freely after re assembly 3 Be sure that during re assembly both feeder cams 2 and D are facing the same direction 3 3 15 Hopping Motor 3 3 15 Hopping motor 1 Turn the AC power switch off Unplug the AC power cable from the outlet 2 Remove the manual feed hopper Assy see 3 3 4 3 Remove the side cover R see 3 3 5 4 Remove
17. 15 Front feeder paper end esesor 3 3 16 13317 Piegistiation rodar 133 18 Drum metor 2319 Ide pss 0329 Fusing ty 2221 Bachas 33 22 EP leck shati 12221 Happing roller essy 9212 Oatiet sensor lever 03253 sensor lever 0328 Paper sensor laver 9327 indet sensor lever 22281 93 291 Paper esd ieser 2 3 20 Goide ial L 3 2 31 Guide P assy 3 3 32 963 3 1 Rear Cover Side Cover L Assy Face Up Stacker Assy And Cover Assy 3 3 1 Rear cover side cover L Assy face up stacker Assy and cover Assy 1 Turn the AC power switch off Unplug the AC power cord from the outlet 2 Remove the interface cable 1 Remove drum toner Assy 2A and store in black plastic bag shipped w printer 3 Open the face up stacker Assy 8 Disconnect the engagement at the left and right protrusions 8A Remove the face up stacker Assy 8 Flex the Assy 8 in the middle to disengage 8A from the Rear cover 0 4 Open the stacker cover 2 and the manual feed hopper Assy3 Remove three screws 4 Remove the side cover L Assy 5 5 Remove two screws 6 Remove the I F cover Assy 7 6 Remove two screws 9 and four claws A Use a small flat blade screw driver to pop claws Remove the rear cover 10 963 3 2 Contact Assy 3 3 2 Contact Assy 1 Turn the AC power switch off Unplug the AC power cord from the outlet 2 Remove the side cover L Assy se
18. 3 3 25 Outlet sensor lever 3 3 25 Outlet sensor lever 1 Turn the AC power switch off Unplug the AC power cord from the outlet 2 Remove the main chassis unit see 3 3 17 3 Press the clamp part of outlet sensor lever 1 Remove the outlet sensor lever 1 by pushing it upward from the lower side Squeeze Squeeze 963 3 26 Toner sensor lever 3 3 26 Toner sensor lever 1 Turn the AC power switch off Unplug the AC power cord from the outlet 2 Remove the main chassis unit see 3 3 17 3 Squeeze the clamp part of toner sensor lever 1 and remove the toner sensor lever 1 by pushing it upward from the lower side urd 3 2 27 Paper sensor lever 3 2 27 Paper sensor lever 1 Turn the AC power switch off Unplug the AC power cord from the outlet 2 Remove the main chassis unit see 3 3 17 3 Squeeze the clamp part of the paper sensor lever 1 Remove the paper sensor lever 1 by pushing it upward from the lower side 963 3 28 Inlet sensor lever 3 3 28 Inlet sensor lever 1 Turn the AC power switch off Unplug the AC power cord from the outlet 2 Remove the main chassis unit see 3 3 17 3 Squeeze the clamp part of two inlet sensor levers 1 Remove the inlet sensor levers 1 by pushing them downward 963 3 29 Insulator 3 3 29 Insulator 1 Turn the AC power switch off Unplug the AC power cord from the outlet 2 Remove the main chassis unit see 3 3 17 8 Remove two scr
19. 4 1 Precautions Prior to the Troubleshooting 1 Go through the basic checking items provided in the Operator Guide 2 Obtain detailed information concerning the problem from the user 3 Go through the checking in the conditions similar to that in which the problem occurred 4 2 Preparations for the Troubleshooting 1 Display on the operator panel The status of the problem is displayed on the LCD Liquid Crystal Display on the operator panel Go through the appropriate troubleshooting procedures according to the messages displayed on the LCD 4 3 Troubleshooting Method When a problem occurs go through the troubleshooting according to the following procedure Pmblemdisplayed by the LOD message Troubkeshooting Garmyoutdetailed according tothe LCD toubeshootng Status List acco ming to the Tmublshooting Flow Table 4 1 Classification LCD Status Message Description Recovery method Jam error Notifies of occurrence Check the paper in of jam while the paper the Power Envelope is being fed from the Feeder Power Envelope Carry out the Feeder recovery printing by opening the cover removing jammed paper and closing the cover and then turning the error display off When the problem occurs frequently to through the Troubleshooting Paper size error Notifies of incorrect size paper feeding from the Power Envelope Feeder Check the paper in the Powe
20. 4 Request To Send RTS TO HOST Hi fixed 5 Not used Not used 6 Data Set Ready DSR FROM HOST Not used 7 Signal Ground SG Signal ground 8 10 Not used Not used 11 11 Supervisory Send SSD TO HOST Not used Data 12 17 Not used Not used 18 5V TO HOST Max 50 mA 19 Not used Not used 20 Data Terminal Ready DTR TO HOST Ready Busy signal 21 25 Not used Not used 4 Signal level MARK polarity 3V to 15V LOGIC 1 e SPACE polarity 3V to 15V LOGIC 0 5 Specifications Item Description Mode Start stop synchronous system Line speed 300 600 1200 2400 4800 9600 19200 bps Data bit length 8 bits 7 bits Parity Odd even none space mark and ignore not selectable Stop bit length 1bit fixed Protocol DTR High DTR LOw XON XOFF Robust XON XOFF Serial data Time amp Example 8 bits with parity BEER UE GN 1 102 Parity bit H LSB Strthit Receive buffer 8K 20K 50K 100K 1M bytes Busy line DTR pin 20 fixed High Ready Low Ready selectable Minimum busy time 200 msec 1 sec Appendix B Centronics Parallel Interface Appendix B CENTRONICS PARALLEL INTERFACE 1 Connector Printer side 36 pin receptacle Female Type 57 40360 12 D56 made by Daiichi Denshi or equivalent Cable side 36 pin plug Male Type 57 30360 made by Daiichi Denshi or equivalent P
21. 5 8 SEC When the toner low state is detected 2 times consecutively Toner Low is established When the toner full state is detected 2 times consecutively Toner Low is cancelled When there is no change with the toner sensor for 2 cycles 5 8 sec x 2 or more then the Toner Sensor Alarm is activated The toner sensor is not monitored while the drum motor is in halt 962 8 Stacker Full Detection 2 8 Stacker full Detection The sensor lever at the paper outlet to the stacker detects a stacker full state about 250 sheets and stops printing of the ensuing pages 962 9 Page Size Detection 2 9 Page Size Detection The four tab pieces are driven according to the setting position of the paper guide through the cam interlocked with the paper guide of the paper cassette When the paper cassette is inserted into the printer the state of the tab pieces is detected by the microswitch to recognize the paper size State of Microswitches SW1 SW2 SW3 SW4 Paper size 0 1 1 1 Letter 0 1 0 1 Executive 0 0 1 1 A4 1 1 1 0 Legal 14 1 0 1 1 Legal 13 1 1 0 1 B5 1 1 0 0 A5 1 0 0 1 A6 Chapter 3 3 Parts Replacement 3 PARTS REPLACEMENT The section explains the procedures for replacement of parts assemplies and units in the field Only the removal procedures are explained here Reverse the procedure for the installation 963 1 Precautions For Parts Rep
22. Guide assy 2PP4076 5754G1 3 6 51016801 8 AOLS PCB 4YA4046 1621G1 5 10 55077101 1 9 Square shaped Square shaped 5 10 56730640 connector connector fixed side fixed side 10 Detector spring 4PP4076 5360P1 3 6 50928901 11 Insulator 3PB4076 5144P1 3 6 51711001 12 Paper end lever 4PP4076 5154P1 3 6 50808201 13 Power sensor PCB 4YB4049 1764P2 5 10 56413702 120V Power sensor PCB 4YB4049 1765P2 5 10 230V 14 AOLC PCB 4YA4046 1620G1 5 10 55077211 1 15 AC cord ODA 3YS4011 1315P1 3 6 56609701 120V AC cord ODA 3YS4011 1266P1 3 6 220V 16 Nylon connector 4YS4011 4448P3 5 10 56730803 cord 17 Earth plate 4PP4076 5742P1 3 6 53346601 18 Guide rail assy L 1PA4076 5410G1 3 6 19 Guide rail assy 1PA4076 5420G1 3 6 Appendix A Rs 232 Serial Interface Appendix A RS 232C SERIAL INTERFACE 1 Connector Printer side 25 pin receptacle Female Type DB 25S or equivalent Cable side 25 pin plug Male Type DB 25P or equivalent Note Plug shall be able to be fixed with a lock screw 2 Cable Pin assignment Cable length 6 ft 1 8m max Cable shall be shielded Note Cable is not supplied 3 Interface signal Pin No Signal name Symbol Signal direction Data terminal ready 1 Protective ground PG 2 2 TD TO HOST Transmitted data from this unit to host 3 3 RD FROM HOST Received data form host
23. No Connect these connectors properly Yes I sthecoil resistance normal resistance between pins 1 and 2 between pins and 4 4 3 W of the drum motor normal No Replacethe drum motor Yes Replacethe driver board Isthe printer recovered No Replace the Control board YES END t Goto on the next flow From on the preceding flow t Yes Isthetransfer roller rotating smoothly No Isthere any defective gear of the transfer roller Yes Replace the defective gear No Replacethetransfer roller Yes 15 the fuser unit installed properly No Install the fuser unit properly Yes stheimage drum cartridge set properly No Set theimage drum cartridge properly Yes Doesthe paper sensor lever operate smoothly No Replacethe paper sensor lever Yes Clean the paper sensor the Power sensor board See Fig 2 3 Sensor Layout Diagram Isthe printer recovered No Replace the Power sensor board YES END 262 4 Paper exit jam 2 4 Paper exit jam Does a paper exit jam error occur when the power is turned on YES Isthe paper on the outlet sensor lever Yes Removethe paper No Doesthe outlet sensor lever operate smoothly No Replacethe outlet sensor lever Yes Clean the outlet sensor on the Power sensor board See Fig 2 3 Sensor Layout Diagram Isthe printer recovered No Replacethe Power sensor board YES END No Is the face up stacker drawn out or pushed into the printer completely No Draw the
24. VORSACHT HEE TA T MPCRATURA ATEMCAO ALTA TEMPERATURA Chapter 2 2 Operation Description 2 OPERATION DESCRIPTION OL1200 consists of a control board a power supply sensor board a driver board an operator panel and an electro photographic process mechanism The control board receives data through a host I F decodes and edits the data and stores the edited data in a memory After completing edition of one page of data it references the font memory and generates bit data on the same memory At the same time it transfers the bit image data to an LED head in units of one dot line The electro photographic process mechanism prints data on paper The operator panel is used for operations and status display Fig 2 1 shows an OL1200 block diagram Figure 2 1 011200 block diagram 962 1 Main Control Board Aolm Pcb 2 1 Main Control Board AOLM PCB The control board consists of a one chip CPU LSls a program font ROM a DRAM an EEPROM a host interface circuit and a mechanism driving circuit 1 One chip CPU The one chip CPU is a custom CPU 32 bit internal bus 32 bit external bus 33 MHz clock that incorporates a RISC CPU and its peripheral devices and has the following functions Built in device Function Chip select controller Control of ROM DRAM and I O device Bus controller DRAM controller DMA controller Transfer of image data from DRAM to OST LSI Parallel interfa
25. When replacing the Control board install the EEPROM mounted on the replaced Control board FO Monitor error double weight Turn the power off then on Replace the Control board Note When replacing the Control board install the EEPROM mounted on the replaced Control board Fl Monitor error argument error Turn the power off then on Replace the Control board Note When replacing the Control board install the EEPROM mounted on the replaced Control board F2 Optional timeout error Turn the power off then on Replace the Control board Note When replacing the Control board install the EEPROM mounted on the replaced Control board F3 Optional status error Turn the power off then on Replace the Control board Note When replacing the Control board install the EEPROM mounted on the replaced Control board F4 BG program error Turn the power off then on Replace the Control board Note When replacing the Control board install the EEPROM mounted on the replaced Control board F5 System timer program error Defect in the cable for the front feeder paper sensor and the 2 pin connector of the Control board Poor connection of connectors Turn the power off then on Repair defective front feeder paper sensor cable and 2 pin connector on the Control board or remove insert the connectors Replace the Control board F6 IPT2 program error Turn the power off then on Replace
26. Yes Mount the image drum in the printer and wait for about 30 minutes No Is the heat roller of the fusing unit dirty Yes Clean the heat roller No Is the contact of the cleaning roller of the image drum cartridge contacted with e contact assembly properly See Figure 6 5 No Adjust the contact of the cleaning roller to contact the contact assembly properly Yes Replace the image drum cartridge Has the trouble been removed Yes End Note After replacing the image drum cartridge set the printer in the user maintenance mode by turning the power on while pressing the MENU key and reset the drum counter Refer to User s Manual No Replace the control board Power Sensor board 3 Black paper is output Is the LED head connected properly Check connector HEAD1 14 HEAD 12 on the control board and PC connector on the LED head No Connect the LED head properly or replace the head cable Yes 15 the contact of the image drum cartridge contacted with the ground contact properly See Figure 6 5D No Checkthe ground contact of the image drum cartridge Yes Check the connectors HEAD1 14 and HEAD2 12 No Replace the LED head Yes Replace the connector Has the trouble been removed Yes End Note X After replacing the LED head set the printer in the engine maintenance mode by turning the power on while pressing the FORM FEED and ENTER keys Set the LED head drive time Refer to Section 4 2 No Replace
27. be carried out according to the prescribed procedures Parts may be damaged if such procedures are not followed Small parts such as screws and collars can easily be lost therefore these parts should be temporarily fixed in the original location When handling printed circuit boards do not use any glove which may generate static electricity Do not place the printed circuit boards directly on the equipment or floor NOTE Always practice good antistatic procedures 963 2 Parts Layout 3 2 Parts Layout This section describes the layout of the main components Hopping cover zin m si C T sd Sensor lever Roller B 963 3 Parts Replacement Methods 3 3 Parts Replacement Methods This section describes the parts replacement methods for the components listed in the disassembly order diagram below Power Envelope Feeder Separator 3 3 1 AOLE PCB 3 3 2 Square shaped connector 3 3 3 Hopping motor 3 3 4 Planet gear 3 3 5 Roller B 3 3 6 Roller A 3 3 7 Mini pitch belt amp Feed roller 3 3 8 3 3 1 Separator 3 3 1 Separator 1 Turn the printer power off and remove the Power Envelope Feeder 2 Disengage the link and hopper cover 3 Remove two screws 1 disengage two locks of the upper cover 2 using a flat head screwdriver and remove the upper cover 2 4 Remove two pan head screws 3 and remove the cover frame 4 b Disengage the plate and the frame Refer to 3 3 6
28. change the default value Writing into the EEPROM is performed when the Enter key is pressed Note Do not change the default value Writing into the EEPROM is performed when the Enter key is pressed Note Do not change the default value Writing into the EEPROM is performed when the Enter key is pressed Note Do not change the default value Writing into the EEPROM is performed when the Enter key is pressed Note Do not change the default value Writing into the EEPROM is performed when the Enter key is pressed Note Do not change the default value reet FUSR CNT processing ON LINE RESET NG De P DRE Upon completion 42 5 964 1 4 EEPROM initialization 4 1 4 EEPROM initialization The corresponding area of the EEPROM is initialized for each event as shown Table 4 1 Table 4 1 Els iH 238188 a system maintenance s Terr engine maintenance Remarks ED haed drive time user counter age counter ria hag ENGINE RESET Engine ID error LCD display ENGINE RESET mu LEE destination 4 2 Adjustment When Replacing A Part 4 2 Adjustment When Replacing A Part Adjustment necessary when replacing one of the followimg parts Part Replaced Adjustment LED Head Set the LED head drive time Refer to Chapter 4 2 1 Image Drum Cartridge Reset the image drum counter Refer to User s manual Fuser Unit Reset the fu
29. connector is necessary for the loop test The loop count is displayed in realtime on the LCD When an error occurs in the course of the test the corresponding error message is displayed Press the ON LINE key to cancel this mode 3 TD RD Loop connector 5 EEPROM reset All EEPROM areas including Menu level 2 to the factory default values The following items are excluded Head drive time setting Fine adjustment of printing start position Standard tray paper feed amount setting Transition to the operation mode occurs upon completion of resetting Press the Menu key to update each category The operation returns to the first category after updating the last category 6 Menu display of Hiper Window Set the display of HIPER WINDOWS in the PRINTER LANGUAGE section of Menu System maintenance mode menu system Menu key Press the 4 orb key Writing into the EEPROM is performed when the Enter key is pressed Press the Press the lores A E e ona s prometa E performed by the Enter is mpm o After the end EA pp sae EH EN NE Press the 4 orb key Writing into the EEPROM is performed upon when the Enter is pressed 9eSystem maintenance mode menu system System maintenance mode menu system lt orb key Writing into the EEPROM ts performed when the Enter key is pressed Press the Press the End of processing Enter key Cont PRT ON LINE key
30. connector on the Control board properly No Connect the interface board option to the OKI HSP interface connector properly Yes 15 there any broken or bent pin in the interface board option Yes Ask the user to replace the interface board option No Replace the Control board OK No Atrouble may exist in the interface board option interface cable or host side Ask the user to check these items 6 5 3 Image troubleshooting 6 5 3 Image troubleshooting Procedures for troubleshooting if abnormal images have been printed out are explained below Figure 6 3 below shows typical abnormal images Trouble Flowchart number Images are light or blurred as a whole Figure 6 4 Dark background density Figure 6 4 2 Blank paper is output Figure 6 4 3 Black stripes in the vertical direction Figure 6 4 4 Cyclical defect Figure 6 4 5 Print voids 6 Poor fusing images are blurred or peeled off 7 when touched by hands White streaks in the vertical direction Figure 8 6 4 C Light o blurred im agec as a whole Blank paper nn a D Black stipes In the Cyellcal defect KD White belts or vertical direction streaks in the vertical direction Fig 6 4 Abnormal images 961 Images are light or blurred a whole 1 Image are light or blurred a whole Is toner low Is the TONER LOW message display
31. fuser counter can be reset in the engine maintenance mode 2 Resetting method Opera tion LCD display With the ENTER and FORM ENG M NT FEED keys pressed tum the printer power on U Press the MENU key 12 tim es FUSER COUNT RESET Press the ENTER key to reset the fuser count After the initializing process is completed printer enters inb the operation mode 4 2 3 Destination setting 4 2 3 Destination setting The desired destination can be set by turning the power on while depressing two keys corresponding to the destination according to the following table Destination Keys to be depressed ODA MENU gt OEL MENU Non Europe 1 MENU PAPER SIZE Australia etc Non Europe 2 MENU TRAY TYPE Singapore etc Chapter 5 265 1 Periodic Parts Replacement 5 1 Periodic Parts Replacement The parts are to be replaced periodically as specified below Part name Condition for Cleaning Remarks replacement Toner cartridge 5 000 LED head Consumables Image drum 30 000 LED head Consumables cartridge 965 2 Cleaning 5 2 Cleaning Remove any toner and dust Clean inside and around the printer with a piece of cloth when necessary Use the handy cleaner VACCUM for cleaning the printers interior Note Do not touch image drum LED lens array and LED head connector block Do not use any solvents 965 2 1 Cleaning of LED L
32. into the manual feed slot or press the FORM FEED button on the printer 4 Toner attached to the image drum is transferred onto the inserted sheet and the sheet is ejected with the toner residue printed While this process is going on the LCD displays CLEANING PRINT message 5 The printer returns to off line mode 965 3 Lubrication General Information 5 3 Lubrication 5 3 1 General Information Lubrication should be performed once a year or as needed Use Lithium Grease When applying the grease do not over lubricate Do NOT allow lubrication to contact the surface of any rollers or paper guides Lubricate the items listed in the table below Item Disassembly Procedure Eject Roller Gears 3 3 11 Page 3 18 Idle Gear Front Feeder 3 3 14 Page 3 22 Stacker Cover Damper Gear 3 3 8 Page 3 15 Transfer Roller Gear 3 3 17 Page 3 25 Gear on the shaft of the Registration Motor 3 3 18 Page 3 27 Idle Gears A B C D Motor Assy 3 3 20 Pages 3 29 and 3 30 Inside of the Fusing Pressure Roller Bearings and Shaft 3 3 22 Page 3 32 Hopping Roller Assy Bearings and Gear 3 3 24 Page 3 34 Bearings and shaft of the Transfer Roller 3 3 36 Page 3 49 Chapter 6 966 1 Troubleshooting Tips 6 1 Troubleshooting Tips 1 Check the basic check points covered in the users manual 2 Gather as much information on the problem from the custome
33. key on overflow UE arem the operator panel to release Past AE C the error display C e Chang the setting of the host side so that the host can detect the busy state of the printer Resend the data from the host side to the printer Buffer EE The printer overrun Press the RECOVER key on overflow TONS NUNT tamem the operator panel to release Ora the error display nara Simplify page data fomatting Interface E An error occurred in the serial I F Press the RECOVER key on error EH This message is displayed when a the operator panel to release parity error a framing error or an the error display overrun error is detected Check the settings of vara RS232C I F in the menu Replace the interface cable or Control board Note When replacing the Control board install the EEPROM mounted in the replaced Control board Card EE The card containing print data was nstall the card again removal eR eae __ _urexp removed error d IPS xxl ATTENTION EN 2 Paper size EE Paper of improper size was fed Check the paper in the tray error sarees from the tray or check to see if more than MANUAL TRAY 1 TRAY one sheet of copy were fed mm 2 or ENVLOP simultaneously Open the cover then close it to perform recovery pr
34. of cover open switch and lever Replace the Power Supply board Controller ae An error was detected by EEPROM Press the RECOVER key on error Lol ID No check the operator panel to reset the tz BH 7207s EEPROM to the factory default EH xara state and to release the error display Optional EN A checksum error occurred whena Remove the card card ete tamem card was inserted Replace the card error TOT ORE C If a card other than the cards for OL series is inserted no error is displayed to ignore the inserted card Optional ain Cake 4 A card was inserted or removed Normal operation cannot be card tamem when the printer is in the on line ensured Turn the power off error rere te mode then on to release the error C display Replace the card 9eL CD Status Messages 3 5 Error Controller nn LCD Status Messages 3 5 A fault occurred in the printer Turn the power off then on to release the error display If the error display cannot be released by this procedure call a service person Code nn Error Remedy 10 An error was detected by program ROM Replace the program ROM Location 05D check 07C Replace the Main board AOLM PCB Note When replacing the Main board install the EEPROM mounted on the replaced Main board 20 An error was detected by font ROM c
35. of paper Remove STACKER FULL oren paper from the AUTE RRE stacker Repair the broker stacker sensor cable Repeat the insertion and removal of the connector Clean or replace the stacker full sensor Daily status Barr Manual loading of paper indicated by the first Load the ate C tamem line message is requested requested paper TATEK EEIE 7 in the feeder and E man press the Form Feed button LCD Status Messages 2 4 General LCD Status Messages 2 4 General Category LCD Status Message Trouble of Status Remedy Paper EN Loading of paper indicated by the Load the requested paper in request B first line message is requested the tray PAFER REQUEST co ara Tray paper The tray has run out of paper Load a paper or a paper out m EH x tttttt Tray being selected cassette to the tray TRAY1 TRAY2 EH o FRONT MANUAL ENVLOP Buffer The memory was overflowed due to Press the RECOVER key on overflow NIS we nee aem the following causes the operator panel to release SEE DH Data to be printed in one page is the error display too much nstall an expansion optional Macro data is too much RAM or reduce the amount of DLL data is too much print data Buffer E The receive buffer was overflowed Press the RECOVER
36. of this High Capacity Second Paper Feeder and it supplies paper automatically through the operation of hopping motor which is driven by signals sent from the printer The main functions are the followings Paper that can be used Paper Type Cut Sheet Size A4 B5 Letter Executive Legal13 Legal14 Special Size Paper Width 148 to 216mm Paper length 210 to 356mm Weight 64 81 g m2 961 2 External View and Component Names 1 2 External View and Component Names Motor assy Upper plate Second side frame R assy Control board AOLT PCB Cassette assy Second side frame L assy Front panel assy 2 Mechanism Description 2 MECHANISM DESCRIPTION 2 1 General Mechanicsm The sheet at the very top of the stack in the paper cassette is fed into the printer one at a time when the High Capacity Second Paper Feeder receives the signal from the printer 1 First the hopping motor rotates in the direction of arrow A The hopping gear is turned by the idle gear and roller C on the same shaft is turned At the same time planet gear D moves in the direction of the arrow E and roller G turns the paper is fed for a predesignated distance until its leading edge reaches roller G 2 Next the hopping motor rotates in the direction of arrow B while the hopping gear also turns Because of the one way bearing being engaged at the hopping gear roller C does not turn The planet gear D moves
37. selected for RS232C SERIAL in menu level 2 coincide with those selected at the host side FLOW CONTROL PARITY BAUD RATE MIN BUSY DATA BITS NO Ifthe selection differs between the printer and the host change the setting of the above items in menu level 2 so as to coincide with the setting at the host side Yes 15 the connector of the serial interface cable connected to the printer properly No Connect the connector of the serial interface cable to the printer properly Yes 15 there any defect in the serial interface cable broken or bent pin broken wire Yes Replace the serial interface cable No Perform the loop back test using the loop test function in the system maintenance mode To make this test it is necessary to form the following loop back connector Connect the loop back connector to port instead of connecting the host Is LLERROR displayed Yes Replace the serial interface cable Is the printer recovered YES END No Replace the Control board No Replace the Control board or ask the user to check the hardware and software at the host side lecp bec e eene t p Sd ia ilrertase cable i Connection meth ad e TD ARTS SETS 8 NOTUSED 11 20 B 20 DB258 Testconneetar connecting drawing 969 Data cannot be received through the OKI HSP interface 9 Data cannot be received through the OKI HSP interface Is the interface board option connected to the OKI HSP interface
38. signals of ROM 05D and 07C are effective T2 CE signals of ROM 05D and 07C are ineffective Chapter 8 8 Parts List 8 PARTS LIST Figure 8 1 Printer Unit Remarks 1000 500 Part Qty 50 OKI J No Name Rating 1 Side cover L 3PP4128 111 6 53073501 Assy 8G1 2 Side cover R 1PP4128 106 6 53073601 5 1 3 IC cover 2PP4128 111 6 53073701 4 1 4 I F cover assy 2PA4128 106 6 53073801 6G1 5 Rear cover 1PP4128 106 6 53073901 9 1 6 Operator panel 2YX4128 107 6 50108101 assy ODA 0G1 7 Flexible cable 238A1071P00 10 56627901 OP panel 12 8 Face up stacker 2PA4128 107 6 50108201 assy 4G1 9 Manual feed 2PA4128 107 6 55700401 hopper assy 6G1 10 Connector cover 3PP4076 505 6 53073301 2P1 11 TR shaft bearing 4PP4076 503 6 51608501 5 1 12 Transfer roller 4PP4076 503 6 50928601 spring L 6P1 13 Transfer roller 4PP4076 503 6 spring R 9P1 with red mark 14 Transfer roller 3YB4076 504 6 50408601 15 TR gear 4PP4076 504 6 51234901 2P1 16 Contact assy 3PA4076 509 6 56731101 0G1 17 Paper cassette IPA4076 543 6 50108001 assy 0G1 18 Damper spring 4PA4076 575 6 assy 8G1 19 Separator frame 3PP4083 566 6 53345601 assy 3G1 20 FG plate BK R 4PP4076 506 6 53346401 7 1 21 AOLM PCB
39. 076 5347P1 0 3 6 50808101 roller release lever 45 LED head 4YA4116 1200G2 2 10 20 56111401 600 A4 18mm 46 Head cable assy 3YX4076 5760G1 2 5 10 47 Cable cover 2PP4128 1096P1 0 3 6 53073401 48 Cable guide B 3PB4128 1110P1 1 3 6 51016501 49 I D unit ODA 4YA4076 5500G2 50 Toner cartridge 4YA4076 5600G2 ODA 51 Anti static strip 4PB4076 5014P3 1 3 6 52 Stacker full sensor 4YB4128 1101P2 2 5 10 assy 53 Head spring 4PP4128 1164P1 0 6 12 54 Earth plate 4PP4043 4688P 1 0 3 6 55 DC fan motor 3PB4076 5290P1 1 3 6 56 FG film 3PB4128 1181P1 1 3 6 57 Hopping roller assy 4PA4076 5333G3 2 5 10 58 Motor assy 3YX4076 5070G1 0 3 6 59 Front feeder unit 1YX4076 5300G1 0 3 6 60 Stacker cover 4PB4076 5015P1 1 3 6 damper 61 Anti static film 3PB4083 6089P4 1 3 6 Front Feeder Unit Front Feeder Unit 16 Name Rating Parts No Q ty 50 500 1000 Remarks 1 Paper supply guide 3PP4076 5348G1 1 0 3 6 51016101 A Affix 1PP4076 5303P1 1 0 3 6 51016201 2 Paper supply guide B 3 E supply guide 1PP4076 5304P1 1 0 3 6 51016301 4 FF roller assy 4PA4076 5757G1 1 1 3 6 50408501 5 FF plate Affix 4PP4076 5310G1 1 1 3 6 51016601 6 FF cam 4PP4076 5313P1 2 0 6 12 51235601 7 Front feeder gear 4PB4076 5314P1 1 0 3 6 51234701 8 8 4YB4076 5316P1 1 2 5 10 50408901 9 Sepa
40. 4Y A4046 163 4G11 10 55077311 Main Chassis Unit Main Chassis Unit BS WEAN ESS Name Rating Parts No Q ty 50 500 1000 Remarks 1 Main chassis assy 2PP4076 5751G1 1 1 3 6 50107901 2 Spring EP lock 4LB 192600 6 1 0 3 6 50928306 lever L assy 3 Stacker cover 4PB4083 6197P1 1 1 3 6 51229401 damper 4 Idle gear exit 4PP4043 4532P1 1 0 3 6 51234301 5 Hopping roller assy 4PA4076 5755G1 1 1 3 6 without shaft 50407901 6 Bearing L Hopping 4PP4076 5345P1 1 0 3 6 51608101 roller assy 7 Bearing R Hopping 4PP4076 5308P1 1 0 3 6 51608201 roller assy 8 Hopping roller gear 4PB4076 5327P1 1 0 3 6 51235501 One way 9 Idle gear A 4PP4076 5061P1 1 0 3 6 51233701 10 Idle gear B 4PP4076 5062P1 1 0 3 6 51233801 11 Idle gear C 4PP4076 5063P1 0 3 6 51233901 12 Idle gear D 4PP4076 5064P1 0 3 6 51234001 13 Idle gear E 4PP4076 5065P1 0 3 6 51234101 14 Registration idle 4PP4076 5068P1 0 6 12 51234201 gear 15 Main motor 4PB4076 5075P2 1 3 6 56511801 16 Registration motor 4PB4076 5076P1 1 3 6 50408001 17 EP lock lever 4PP4076 5044P1 0 3 6 50807301 18 EP lock spring 4PP4076 5045P1 0 3 6 50928401 19 Pressure release 3PP4076 5046P1 0 3 6 50807401 lever 20 Spring Pressure 4LB 192500 7
41. 6 5 1 Perform detailed trouble shooting with the trouble stiooting image troubles and troubles that not indicated by LCD message Perform troubleshooting with the troubleshooting chart See 6 5 3 6 5 1 LCD status message trouble list 6 5 1 LCD status message trouble list Table 6 1 lists the status and troubles that may be indicated by messages on the LCD LED status EN OFF Co BLINK E on Undefined LCD Status Messages 1 4 General LCD Status Messages 1 4 General Category LCD Status Message Trouble or Status Remedy Daily status sa The printer is in the on line mode Normal operation ON LINE __ _nrexp tttttt WT co XXX Emulation in use M HP4 PS HxD AUT tttttt Tray being selected TRAY 1 TRAY 2 FRONT MANUAL ENVLOP mmmmmmmmm Paper size in the tray being selected LETTER EXECUTIVE LEGAL 14 LEGAL 13 A4 SIZE A5 SIZE A6 SIZE B5 SIZE COM 10 MONARCH DL ENV C5 ENV C4 ENV Daily status The printer is in the off line mode Normal operation rmm RUE ara Daily status The data remains unprinted in the buffer In the off line DATA MANFEED Data On The printer is in the on line mode mode the data is pa mene Data Flash The printer is receiving the printed by 7 data or performing the output pro
42. 963 3 13 Separator F 3 3 13 Separator F 1 Turn the AC power switch off Unplug the AC power cord from the outlet 2 Remove the manual feed hopper Assy see 3 3 4 3 Remove the side cover R see 3 3 5 4 Remove the front feeder Assy see 3 3 12 steps 1 to 3 Make a diagram of wire locations and routing 5 Remove two screws 1 and then remove the inner cover 2 At this time the cover lock lever 3 and the torsion spring 4 are also removed Note position of torsion spring 6 Remove two screws 5 and then remove square shaped connector 6 7 Using great care remove the connector of switch Assy 7 from square shaped connector 6 8 Turn idle gear 8 in the direction of arrow A until front feeder plate 9 is elevated 9 Remove front feeder gear 10 and then remove two springs A Be careful not to lose the springs 10 Remove four screws B and then remove paper supply guide C At this time front feeder earth plates D G and H are also removed 11 Remove front feeder plate 9 by releasing the engagement at two parts 9A Switch Assy 7 may now be removed 12 Pull up separator E toward you and then release two mounting posts at 15A to remove the separator At this time two springs F are also removed Be careful not to lose the springs 13 Release two mounts on paper supply guide C and pull out switch Assy 7 upward During Re assembly use great care do not pinch crimp or cut wires to switch Assy 7 963 3
43. CONT i5 performed by the power supe Press the of process TONS a aspe B mee a power supply off T After the end Erter key EA ee Press the 4 orb key Writing into the EEPROM is performed dado aedi when the Enter key is pressed 4 1 3 Engine maintenance mode 4 1 3 Engine maintenance mode The engine maintenance mode is activated when the power is turned ON while pressing to the Form Feed key and Enter key This mode adopts the menu for function selection The method for exit from this mode depends on the setting The engine maintenance mode is provided with the following functions 1 Head drive time setting Sets the drive time of the LED head 2 Printing start position setting Sets the printing start position 8 Drum count total display Displays on the LCD the total number of drum revolutions in the unit counted at the engine 4 Drum count display Displays on the LCD the total number of EP drum revolutions counted at the engine 5 Setting of standard tray paper feed length This function sets the paper feed length of standard tray paper 6 Setting of front feeder paper feed length This function sets the paper feed length of the front feeder 7 Setting of High Capacity Second Paper Feeder paper feed length This function sets the paper feed length of the High Capacity Second Paper Feeder 8 Selection of High Capacity Second Paper Feeder d
44. Chapter 1 1 Configuration 1 CONFIGURATION 1 1 System Configuration OL 1200 consists of control and engine blocks as the standard configuration See Figure 1 1 In addition the following options are also available Centronics intertace Bidirection mn Figure 1 1 961 2 Printer Configuration 1 2 Printer Configuration The printer unit consists of the following hardware components Electro photographic processor Paper feeder Controller Operator panel Power sensor board Figure 1 2 shows the printer unit configuration Operator Panel Assy Stacker Cover Assy Face up Stacker Assy Rear Cover Eject Rolle Se Base Unit 961 3 Optional Configuration 1 3 Optional Configuration The options below are available for use with OL1200 They are sold separately from the printer unit 1 Power Envelope Feeder Ti 4 RAM module RAM module 16MB RAM module 961 4 Specification 1 4 Specification 1 Type Desk top 2 External dimensions Height 10 6 270 mm excludes protruding Width 14 4 366 mm Portion Depth 16 9 430 mm 3 Weight 15 2 kg 33 5 Ibs 4 Development method Dry electrophotography Exposure method LED stationary head 5 Paper used Type e Standard paper Xerox 4200 20 165 Application paper manual face up feed Label Envelope OHP paper Transparency Size Standard sizes Letter Legal Exec
45. Data received from the host is stored in the receive buffer Busy control is performed Signal lead control is performed 6 Timing charts Data receiving timing DATA 1 8 TEN 20 M ips min Ld tus min lt 63 Mo H e 26s ACK Appendix A 2 1 General Mechanism 2 1 General Mechanism The sheet or envelope at the very bottom of the stack is fed into the printer one at a time when the Power Envelope Feeder receives the signal from the printer 1 The hopping motor rotates in the direction of arrow D The planet gear F moves in the direction of arrow G and drives rollers A and B Roller C is linked to pulley which is on the same shaft as roller A and it also turns at the same time as roller A The paper is fed for a predesignated distance until the leading edge reaches roller C 2 Next the hopping motor rotates in the direction of arrow E The planet gear F moves to the direction of arrow H and drives idle gear J The rotation of idle gear J is transmitted to the gears linked to it and drives pulley on the same shaft as roller A turning roller C to feed the paper into the printer until it reaches the registration roller of the printer During this process a one way bearing is engaged at pulley so that the rotation of pulley is not transmitted to roller A preventing any feeding of papers by roller A Appendix C eHigh Capacity Second Paper Feeder 1 1 Functions The printer is mounted on top
46. acing the LED head set the printer in the engine maintenance mode by turning the power on while pressing the FORM FEED and ENTER keys Set the LED head drive time Refer to Section 4 2 No Replace the control board OLCW or power sensor board 267 Poor fusing 7 Poor fusing Is paper of the specified grade used No Use paper of the specified grade Yes Is the spring of the back up roller normal No Replace the spring Yes 15 the contact of the fusing unit assy contacted with the contact assy properly See Figure 6 5 G No A Adjust the contact of the fusing unit assy to contact the contact assembly properly Yes Replace the fusing unit assy Has the trouble been removed Yes End No Replace the control board or power sensor board 968 White belts or streaks in the vertical direction 8 White belts or streaks in the vertical direction Are the LED lens dirty Yes Clean the LED lens No Is the contact plate of the transfer roller contacted with the power sensor board properly See Figure 6 6 No Make the contact plate contact with the power sensor board properly Yes Replace the transfer roller See 3 3 36 Has the trouble been removed Yes End No Is the LED head installed properly CN4 connector HEAD1 14 HEAD2 12p on the control board and PC connector on the LED head No Install the LED head properly Yes Replace the LED head Has the trouble been removed Yes End N
47. atibility mode Unidirectional communications from the host to the printer Nibble mode This mode transmits 4 bit wide data from the printer to the host In this mode each 1 byte data is transferred in the form of two nibbles using ERROR BUSY FAULT and SELECT signal leads This mode can provide the bidirectional operation in combination with the compatibility mode ECP mode his mode provides the asynchronous bidirectional interface and transmits and receives 1 byte data using eight data signal leads under the semi duplex control by the host When the power is turned on the compatibility mode is automatically selected The change to another mode from the compatibility mode is made through negotiation When the BI DIRECTION is set to ENABLE in the menu this change can be performed For the electrical physical characteristics of this interface see APPENDIX B b RS232C serial interface The following protocol is supported for the serial interface conforming to EIA RS232C READY BUSY DTR HI or DTR LO X ON X OFF RBST X ON For the electrical physical characteristics of the interface see APPENDIX A c OKI HSP interface Option This interface slot is an OKI unique universal interface that provides the platform to connect various boards including those supplied by third venders such as the LAN connection expansion board Any expansion boards compatible with this interface can be mounted on the Control board without
48. ce controller Control of Centronics parallel interface Serial interface controller Control of RS 232C serial interface Timer Generation of various control timing Monitoring of paper running and paper size Serial I O port Control of operator panel EEPROM and options port Inputting outputting of sensor signal and motor signal Option I O interface Control of OKI HSP interface 2 Program font ROM The program font ROM stores the equipment program and various types of fonts EPROM OTP or masked ROM is used as an program font ROM 3 Memory 2 Megabyte DRAM 512K x 4 is mounted as resident memory to be used for storing the program and providing various buffers This DRAM is expandable up to 34 Mbytes by adding expansion memory SIMMs This DRAM provides the areas shown in the following table Memory capacity setting Memory area Use MENU Expansion RAM System area Working area used for the Fixed Fixed program Working area used for the program Raster buffer Stores converted bit image data Enable Expandable Receive buffer Stores temporarily the data Enable Expandable received from the host interface Page buffer Adds print information to the Expandable analyzed receive data and stores the resulted data DLL macro buffer Stores soft fonts and macro data Expandable Font cache buffer Stores bit map fonts generated by Enable Expandable the font rasterizer based
49. cessing pressing the FORM FEED button Daily status The printer is printing Normal operation Daily status ran The printer enters into this mode when the idle Normal operation FOWER SAVING sanreep state continues for the period of time specified in the Power Save menu option pata Daily status Toner is running out Replace the toner TONER LOW C raem This message is displayed in combination with cartridge 7 other message indicated in the first line Normal C mara operation such as stop continuation of printing can be continued If LOW TONER OFF is selected in the menu the LED ATTENTION flashes Daily status TONER SENSOR Ea ATTENTION A fault occurred in the toner sensor Normal operation can be continued Check the operation of the toner sensor lever Replace the Power Sensor board hereinafter simply called the Power board Replace the Control board Note When replacing the Control board install the EEPROM mounted on the replaced Control board Daily status E The data that remains unprinted in the buffer is Normal operation p Erb deleted and the printer is initialized to the user BE trees default settings EN pata The temporary DLL Macro and User pattern are deleted Daily status All fonts of t
50. direction of arrow H and drives idle gear J The rotation of idle gear J is transmitted to the gears linked to it and drives pulley on the same shaft as roller A turning roller C to feed the paper into the printer until it reaches the registration roller of the printer During this process a one way bearing is engaged at pulley so that the rotation of pulley is not transmitted to roller A preventing any feeding of papers by roller A Planet gear F Hopping motor 9 Idje gear J Roller B Pulley I Belt Roller A Roller C 962 2 Hopper Mechanism 212 Hopper Mechanism The hopper automatically feeds the printer with the paper being set single sheet at a time Envelope Feeder Printer Registration roller 263 Parts Replacement 3 1 PARTS REPLACEMENT This section covers the procedures for the disassembly reassembly and installation in the field This section describes the disassembly procedures For reassembly procedures reverse the disassembly steps Precautions Concerning Parts Replacement 1 Parts replacements must be carried out by first turning the printer power switch off O and removing the Power Envelope Feeder from the printer Do not disassemble the Power Envelope Feeder if it is operating normally Establish the extent of disassembly suitable for the purpose of the procedure and do not disassemble any more than necessary Only specified service tools may be used Disassembly must
51. ductive sponge material and is designed to make the image drum surface and the paper closely into contact Paper is placed over the image drum surface and a positive charge opposite in polarity to the toner is applied to the paper from its reverse side The application of a high positive voltage from the power supply to the transfer roller causes the positive charge induced to the transfer roller surface to be transferred to the paper at the contact between the transfer roller and the paper As a results toner charged negative that is attracted to the image drum surface is transferred to the upper side of the paper by the positive charge on the lower side of the paper Image drum Transfer roller 9e 7 Fusing 7 Fusing After the end of the transfer the unfused toner image is fused on the paper under heat and pressure as it passes between the heater roller and the back up roller The heater roller with a Teflon coating incorporates a 400W heater Halogen lamp which heats the heat roller A thermistor which is in contact with the heater roller regulates the heater roller at a predetermined temperature about 185 188 C A safety thermostat cuts off voltage supply to the heater by opening the thermostat in the event of abnormal temperature rises The back up roller is held under a pressure of 2 5 kg from the pressure spring at each side Heater HeaterRo ler Separation Chw 8 Cleaning 8 Cleaning A
52. e 3 3 1 1 to 4 8 Remove two screws 1 Remove the contact plate cover 2 and the contact Assy 3 Pull bottom of Assy 3 out first then the top of Assy Remove fan connector cables from location 4 Caution Be careful not to deform the electrodes of the contact Assy when removing the contact Assy 963 3 3 Dc Fan Motor 3 3 3 DC fan motor 1 Turn the AC power switch off Unplug the AC power cord from the outlet 2 Remove the side cover L Assy see 3 3 1 1 to 4 8 Unplug the connector of the DC fan motor 1 and remove the DC fan motor 1 963 3 4 Manual Feed Hopper Assy 3 3 4 Manual feed hopper Assy 1 Turn the AC power switch off Unplug the AC power cord from the outlet 2 Open manual feed hopper Assy 1 Disengage the lower portion of this Assy 3 Hold manual feed hopper Assy 1 vertically and remove the left and right levers 2 with a downward motion 963 3 5 Side Cover R Operator Panel Assy 3 3 5 Side cover R operator panel Assy 1 Turn the AC power switch off Unplug the AC power cord from the outlet 2 Remove interface cable 1 3 Open stacker cover 2 Remove two screws Remove I F cover Assy 4 4 Remove two screws 5 and flexible cable 6 use care to not damage flexible cable Remove operator panel Assy 7 5 Open manual feed hopper Assy 8 Remove three screws 9 and then remove side cover R 10 963 3 6 Earth Plate Bk R Aolm Pcb Ic Cover 3 3 6 Earth p
53. ed Yes Supply toner No Is paper of the specified grade used No Use paper of the specified grade Yes 15 the lens surface of the LED head dirty Yes Clean the lens No Is the LED head installed properly Check connector HEAD1 14P HEAD2 12P of the control board and PC connector on the LED head for proper connection No Install the LED head properly Yes 15 the contact plate of the transfer roller contacted with the contact assembly of the power sensor board properly See Figure 6 6 No Make the contact plate of the transfer roller contact with the power sensor board and Shaft of the transfer roller properly Yes Are the contact of the developing roller and the contact of the toner supply roller of the image drum cartridge contacted with the contact assembly properly See Figure 6 5 A and B No Adjust the contacts of the developing and toner supply roller to contact the contact assembly properly Yes Replace the transfer roller See 3 3 36 Has the trouble been removed Yes End No Replace the image drum cartridge Has the trouble been removed Yes End Note After replacing the image drum cartridge set the printer in the user maintenance mode by turning the power on while pressing the MENU key and reset the drum counter Refer to User s Manual No Replace the control board or Power Sensor board 2 Dark background density 2 Dark background density Has the image drum been exposed to external light
54. ed out according to the prescribed procedures Parts may be damaged if such procedures are not followed 6 Small parts such as screws and collars can easily be lost therefore these parts should be temporarily fixed in the original location 7 When handling printed circuit boards do not use any glove which may generate static electricity 8 Do not place the printed circuit boards directly on the equipment or floor NOTE Always practice good anti static precautions 963 2 Parts Layout 3 2 Parts Layout This section describes the layout of the main components Control board ST AOLT PCB eh i Upper plate dii Front panel X x f 4 1 Hopping motor gt 5 ug E Sos N Hopping gear N One way EM 2 y Us AA Feed gear C 1 One way Second side 2 frame L ER Hopping roller lir 57 963 3 Parts Replacement Methods 3 3 Parts Replacement Methods This section describes the parts replacement methods for the components listed in the disassembly order diagram below High Capacity Second Paper Feeder we Idie rollers uc AOLT PCB 3 3 2 Hopping motor 3 3 3 Feed roller 3 3 4 B Hopping roller rubber 3 3 5 L Sideframe L assy 3 3 8 963 3 1 Idle rollers 3 3 1 Idle rollers 1 Remove two screws 1 and remove the front panel assy 2 2 Remove two idle rollers 3 AA Q IN gt b Ber 3 3 2 AOLT PCB
55. ens Array 5 2 1 Cleaning of LED Lens Array Clean the LED lens array or replace the toner cartridge when white lines or stripes void light printing are generated vertically down the page as shown below Note The LED lens array must be cleaned with an LED head cleaner LED Lens cleaner pads are included with replacement toner cartridges White linesorstripes void light printing 1 Set the LED head cleaner to the LED lens array as shown in the figure then slide the cleaner back and forth several times to clean the head Note Gently press the LED head cleaner onto the LED lens array 2 Throw the cleaner pad away 965 2 2 Cleaning Page Function 5 2 2 Cleaning Page Function There is a Charge Roller cleaning function within this printer which can be executed by the user 1 While the printer is in off line mode press both the left arrow and right arrow keys on the printer operator panel for at least 2 seconds The printer enters the cleaning mode 2 The LCD displays CLEANING on the upper line and on the lower line MANUAL LETTER REQUEST is displayed Characters will scroll one at a time from right to left LETTER may be replaced by A4 depending on the default paper type selected in the menu While the lower line scrolls the message the upper line will stay fixed When the above message appears on the LCD the user can verify that the printer has entered the cleaning mode 3 Insert a sheet of paper
56. ensor within a predetermined distance after the paper has reached the inlet sensor The trailing part of the paper does not pass over the paper sensor within a predetermined distance after the leading edge of the paper has passed over the paper sensor The leading part of paper does not reach the outlet sensor within a predetermined distance after the paper has reached the paper sensor Paper exit jam At power on time the paper is placed on the outlet sensor The paper does not pass over the outlet sensor within a predetermined time after the leading part of the paper has reached the outlet sensor The paper size check with the manual feed specified considers the reference size as free size Paper size error Paper size error The size of the paper is supervised by the inlet sensor 1 Itis detected that the paper does not pass over the inlet sensor 1 within predetermined range of distance The inlet sensor 2 detects that the size of the loaded paper is A4 or larger or smaller than A4 The detected paper size differs from the paper size set by command or menu The paper size check with the manual feed specified considers the reference size as free size 962 6 Cover Open 2 6 Cover Open When the stacker cover is opened the cover open microswitch on the power sensor board is turned off to cut the supply of 30V to the high voltage power supply circuit As a result all high voltage outputs
57. eplace the sensor plate Inlet t YES Clean the Inlet sensor on the power sensor board or replace the power sensor board or Inlet sensor NO Replace the feed roller roller A or roller B NO the feed roller roller A and roller B rotating YES X Setthe paper properly NO Isthe belt torn YES Replace belt NO Isthe pulse motor turning YES Replace planet gear NO the connector cable being connected properly NO Connect the connector cable properly YES Check the coil resistance approx 32y of the stepping motor Is it normal NO Replace the stepping motor YES Replace the AOLE PCB 965 Connection Diagram 5 CONNECTION DIAGRAM 5 1 Interconnection Diagram AOLE PCB AOLE PCB To the Printer 965 2 PCB Layout 5 2 PCB Layout AOLE PCB 6 Parts List 6 PARTS LIST HHHH No Description Part No Separator 4PP4083 5544G1 1 3PB4083 5514P1 1 gear 4PP4083 5520P1 1 motor 4PB4083 6075P1 1 3PB4083 5524P1 1 pulley 4PB4043 4614P1 1 pitch belt 4LP 1313 338 1 4PB4043 4743P1 1 AOLE PCB 4YA4046 1647G11 1 10 Square shaped connector 220A1866P0141 Table 6 1 Power Envelope Feeder 11 Nylon connector cord Stirrer roller gear 4YS4011 4448P4 4PP4083 2394P1 Qty 53344201 53343801 51229601 56510701 53343901 51235701 51304901 1 1 3 Remarks 3 tn ULT 56730641 1 Roller A Planet Hopping Roller C One way Mini Roller B 12
58. ews 1 and then remove inlet holder 2 At this time remove inlet 3 from inlet holder 2 4 Remove eight screws 4 connector 5 and two screws 6 Remove Power sensor PCB 7 together with AOLC PCB 8 5 Unplug connector 9 and remove Power sensor PCB 7 6 Remove insulator B Caution Be careful not to deform the paper end lever A QN 963 3 30 Paper end lever 3 3 30 Paper end lever 1 Turn the AC power switch off Unplug the AC power cord from the outlet 2 Remove the main chassis unit see 3 3 17 3 Release the lock and remove paper end lever 1 963 3 31 Guide rail L Assy 3 3 31 Guide rail L Assy 1 Turn the AC power switch off Unplug the AC power cord from the outlet 2 Remove the main chassis unit see 3 3 17 3 Remove the insulator see 3 3 29 4 Remove screw 1 and then remove base plate 2 b Remove two screws 3 and then remove guide rail L Assy 4 6 Remove cassette lock spring 5 and then remove bias link 6 and pull block 7 Pay attention the direction of hook of cassette lock spring 5 7 Remove spring 8 and then remove cassette stopper 9 8 Remove screw 10 from bias link 6 and then remove link support A 3 3 32 Guide rail R Assy 3 3 32 Guide rail R Assy 1 Turn the AC power switch off Unplug the AC power cord from the outlet 2 3 Remove the insulator see 3 3 29 4 Remove screw 1 and then remove base plate 2 5 Remove two screws 3 and the
59. face up stacker out the printer completely or push it into the printer completely Yes I stheejec roller assembly installed properly No Install the eject roller assembly properly Yes Replace the eject roller assembly 3 Paper size error 3 Paper size error Is paper of the specified size used No Use paper of the specified size Yes Dothe inlet sensor lever and paper width sensor lever operate smoothly No Replace the inlet sensor lever or paper width sensor lever Is the printer recovered No Clean the inlet sensor or paper width sensor on the Power sensor board See Fig 2 3 Sensor Layout Diagram Is the printer recovered No Replace the Power sensor board YES END YES END YES Does the outlet sensor lever operate smoothly No Replace the outlet sensor lever Is the printer recovered No Clean the outlet sensor on the Power sensor board See Fig 2 3 Sensor Layout Diagram Is the printer recovered No Replace the Power sensor board YES END YES END Yes Clean the inlet sensor paper width sensor and outlet sensor See Fig 2 3 Sensor Layout Diagram Is the printer recovered No Replace the Power sensor board YES END 964 Fuser unit error ERROR 71 ERROR 72 ERROR 73 4 Fuser unit error ERROR 71 ERROR 72 ERROR 73 Turn the power OFF ON Does a fuser unit error occur immediately Yes 15 the thermistor open or shorted Measure the resistance between thermistor contact
60. from the printer 3 Release two locks and remove separator Assy 2 At this time leaf spring 3 and coil spring 4 are also removed Be careful not to lose these springs 963 3 36 Transfer roller 3 3 36 Transfer roller 1 Turn the AC power switch off Unplug the AC power cord from the outlet 2 Open stacker cover 1 3 Lift the left side of the gear TR 2 and release the lock Remove gear TR 2 and transfer roller 3 At this time two bearings TR 4 and two transfer roller springs 5 are also removed 4 Remove diselectrification bar 6 and diselectrification film 7 from the chassis unit Chapter 4 4 Adjustment 4 ADJUSTMENT This chapter explains the adjustment necessary when replacing a part Adjustment is made by changing a parameter value set in EEPROM on the controller PCB A parameter is set with the use of the keys on the operator panel This printer has three kinds of maintenance mode You will utilize one of the maintenance modes when replacing key parts 964 1 Maintenance Modes And Functions 4 1 Maintenance Modes And Functions User maintenance mode To enter the user maintenance mode turn on the POWER switch while pressing the MENU key Function There are six functions as follows Menu reset Hex dump Drum counter reset Operator panel menu disable e X adjust Y adjust System maintenance mode Note This mode is used only by service persons and it should not be released to t
61. fter the end of the transfer residual toner on the image drum is attracted to the cleaning roller temporarily by static electricity to clean the image drum surface Image Drum Ckaning Roller Transfer Roller 9 Cleaning Of Rollers 9 Cleaning of rollers The charge roller transfer roller and cleaning roller are cleaned in the following cases In warming up at power on time In warming up after the cover is opened and closed When the number of accumulated sheets is 10 or more and the printout operation ends Changes in bias voltage applied to each roller move adhesive toner from the roller to the image drum and return it to the developer 962 5 Paper Jam Detection 2 5 Paper Jam Detection The paper jam detection function supervises the paper state at power on time and during printing In the event that a jam occurs this function interrupts the printing process If any of the following errors is presented recovery printing will be performed by removing the jammed paper by opening the upper cover removing the jammed paper and closing the upper cover Error Cause of error Paper input jam At power on time the paper is placed at the inlet sensor After hopping operation is attempted three times the leading part of the paper does not reach the inlet sensor Paper feed jam At power on time the paper is placed at the paper sensor The leading part of the paper does not reach the paper s
62. he LCD Liquid Crystal Display on the Operator panel Go through the appropriate troubleshooting procedures according to the messages displayed on the LCD 964 3 Troubleshooting Method 4 3 Troubleshooting Method When a problem occurs go through the troubleshooting according to the following procedure Problem displayed by i Gamy out detailed the LOD message i troubleshooting i according to the Tmubleshooting Flow 43 2 4 3 1 LCD Status Message List 4 3 1 LCD Status Message List The listing of the statuses and problems displayed in the form of messages on the LCD is provided in Table 4 1 Classification LCD Status Message Description Recovery method Jam error PAPERINPUT JAM Notifies of occurrence Check the paper in the of jam while the paper High Capacity Second is being fed from the Paper Feeder Carry out High Capacity Second the recovery printing by Paper Feeder opening the cover removing jammed paper and closing the cover and then turning the error display off When the problem occurs frequently to through the Troubleshooting Paper size Notifies of incorrect Check the paper in the error size paper feeding High Capacity Second from the High Capacity Paper Feeder Also check Second Paper Feeder to see if there was a feeding of multiple sheets Carry out the recovery printing by opening the cover removing paper and closing the cover and then turn
63. he end users To enter the system maintenance mode turn on the POWER switch while pressing the RECOVER key Function There are five functions as follows Page count display Loop test Page count printing enable disable EEPROM reset Rolling ASCII continus prinitng Engine maintenance mode Note This mode is used only by service persons and it should not be released to the end users To enter the engine maintenance mode turn on the POWER switch while pressing the FORM FEED key and ENTER key Function There are 13 functions as follows Head drive time setting Printing start position setting Drum counter total display Drum count display Setting of standard paper feed length Setting of front feeder paper feed length Setting of second tray paper feed length Selection of second tray feeder download table Setting of envelope feeder paper feed length Selection of envelope feeder download table Fuser count indication Fuser count reset Engine reset 964 1 1 User maintenance mode 4 1 1 User maintenance mode To enter the user maintenance mode turn the power supply ON while pressing the Menu key This mode uses the menu for function selection The user maintenance mode provides the following functions 1 Menu reset All settings for Menu level 1 are reset to the factory default values The menus for all executable emulations including options are reset to the factory default values T
64. he operation mode starts automatically upon completion of resetting 2 Hex dump The data received from the host is dumped in hexadecimal notation to the printer Printing is activated automatically when the received data exceeds one page If the received data is less than one page printing can be activated manually be pressing the Form Feed key after selecting the OFF LINE Automatic activation of printing even when the received data is less than one page by selecting the Auto Eject function on the menu To exit from this mode is turning the power OFF 8 Drum counter reset This function resets the drum life data when the user replaces the image drum unit The operation mode starts automatically upon completion of resetting 4 Operator panel menu disable This function is for enabling and disabling the operator panel menu functions Menu 1 Menu 2 Tray Select Copies and Paper Size 5 X ADJUST This function is used to adjust the printing start position within the range of 2 mm in 0 25 mm steps in the X direction 6 Y ADJUST This function is capable to adjust the printing start position within the range of 2 mm in 0 25 mm steps in the Y direction 9eUser maintenance mode menu system User maintenance mode menu system Sure M MENU processing ON LINE Press the Enter key ON LINE End of processing ts performed HEX Dump by the power supply OFF noirs After the end
65. he printer are being printed Normal operation PRINT FONTS tamem Ready ON Executed by command entry EH raa Ready flashing Executed by key operation Daily status The demo page is being printed Normal operation PROT DEMO PAGE Ready ON Executed by command ATTENTION entry rama Ready flashing Executed by key Daily status The current menu setting is being printed Normal operation PRINT MENU C Ready ON Executed by command entry arrer Ready flashing Executed by key operation aTa Daily status Ea The drum is running down Replace tarem This message is displayed in combination with the image drum 7 ATTENTION other message indicated on the first line cartridge C Normal operation can be continued Note After replacing the drum cartridge reset the drum counter Refer to the Users Manual Daily status The fuser is running down Replace arem Normal operation can be continued the fuse unit Note After replacing the fuser unit reset the fuser counter Refer to chapter 4 2 2 Daily status When the number of copies being printed is two Normal operation OPDE o rmm mmm MANFEED or more the number of copies being printed is displayed ara Daily status The face down stacker is full
66. heck Replace the program ROM Location 06D 07D Replace the Main board AOLM PCB Note When replacing the Main board install the EEPROM mounted on the replaced Main board 30 An error was detected by resident RAM check Replace the Main board AOLM PCB Note When replacing the Main board install the EEPROM mounted on the replaced Main board 40 An error was detected by EEPROM check Replace the EEPROM Location 04G Replace the Main board AOLM PCB 50 An error was detected by optional software ROM Check the optical software ROM for proper connection Replace the optional software ROM 60 An error was detected by optional RAM check Check the optional RAM for proper connection Replace the optional RAM 70 A fault occurred in the fan motor Connect the fan motor cable properly Replace the fan motor Replace the Power Supply board 71 A fault occurred in the fuser See chapter 6 5 2 72 Thermistor open error See chapter 6 5 2 73 Thermistor short error See chapter 6 5 2 74 SSIO error See chapter 6 5 2 80 I F timeout occurred between the printer main unit and the operator panel See chapter 6 5 2 81 I F timeout occurred between the printer main unit and the optional tray 2nd tray envelope feeder etc See chapter 6 5 2 90 A watchdog timer timeout occurred Turn the power off then on Replace the Control board Note
67. in the direction of the arrow F drives the Roller G and feeds the paper into the printer until it reaches the registration roller of the printer Roller G Roller C Hopping roller gear eo Planet gear D Idle gear Hopping motor Once the delivered into the printer the paper is then controlled and fed through by registration motor of the printer 962 2 Hopper Mechanism 2 2 Hopper Mechanism The hopper automatically feeds the printer with the paper being set single sheet at a time When the paper is loaded in the paper cassette it is then transported by the hopping motor carrying forward only a single sheet caught by the brake shoe at a time Hopping roller 963 Parts Replacement 3 PARTS REPLACEMENT This section covers the procedures for the disassembly reassembly and installations in the field This section describes the disassembly procedures For reassembly procedures reverse the dis assembly instructions 3 1 Precautions Concerning Parts Replacement 1 Parts replacements must be carried out by first turning the printer power switch off O and removing the High Capacity Second Paper Feeder from the printer 2 Do not disassemble the Second Paper Feeder if it is operating normally 3 Establish the extent of disassembly suitable for the purpose of the procedure and do not disassemble any more than necessary 4 Only specified service tools may be used 5b Disassembly must be carri
68. ing the error display off Tray paper Load the paper or paper out Notifies of no paper or cassette in the High paper cassette state of Capacity Second Paper the High Capacity Feeder Second Paper Feeder Synchronous Notifies of occurrence Verify connection of serial I O ERROR CONTROLLER of interface error AOLT PCB and error A between the printer square shaped connector SSIO Error and the High Capacity Replace the square shaped Second Paper Feeder connector if necessary Replace AOLT PCB Interface Notifies of occurrence Verify connection of Timeout of interface timeout AOLT PCB and between the printer and the High Capacity Second Paper Feeder square shaped connector Replace the square shaped connector if necessary Replace AOLT PCB 4 3 2 Troubleshooting Flow 4 3 2 Troubleshooting Flow JAM error Paper Input Jam Does paper jam at the inlet when the power is turned on YES Is paper located above the sensor plate Inlet YES Remove the paper t NO _ Is the sensor plate Inlet operating normally NO Replace the sensor plate Inlet t YES Replace the power sensor board or inlet sensor t NO When the paper is fed in does the paper input jam occur YES Is the paper being fed to above sensor plate Inlet YES Is the sensor plate Inlet operating normally NO Replace the sensor plate Inlet t YES Clean the inlet sensor on the power sensor board or
69. inting and the error display is released f this error occurs frequently see chapter 6 5 2 Paper size E A jam occurred during paper Check the paper in the error EH 8527 feeding from the tray cassette Open the cover then MANUAL TRAY 1 TRAY close it to perform recovery 7 nara 2 or ENVLOP printg and the error display is released e f this error occurs frequently see chapter 6 5 2 Jam errors ge A jam occurred during paper Check the paper in the EH 20 feeding from the tray cassette Open the cover then MANUAL TRAY 1 TRAY close it to perform recovery mm 2 or ENVLOP printg and the error display is released If this error occurs frequently see chapter 6 5 2 Jam errors ge A jam occurred during paper Open the cover remover the ps ea EH feeding after finishing paper paper then close the cover TD TER ee 7 hopping from the tray When the cover is closed rara recovery printing is performed and the error display is released f this error occurs frequently see chapter 6 5 2 Daily status Barr Menu operation Normal operation in menu tamem mode ATTENTION pata Daily status ge The upper cover was opened Close the cover to release m cm the error display If the display does not C change after the cover is closed check for correct operation
70. inuity between L and N pins normal resistance 554 ky For measuring points see Fig 6 2 No Replace the fuse F1 or the Power sensor board Yes Are POWER connector and FRONT connector white 9 pin connector for CN3 on the Power sensor board CN8 on the Driver board and the Control board made properly No the connectors properly Yes Are the following voltages applied to CN3 connector of the Power sensor board For measuring points see Fig 6 3 Pins 16 17 30V Pins 8 10 14 15 OV Pin 20 8V Pins 11 13 5V Pin 21V 8V No Replace the Power sensor board Yes Replace the Driver board Is the printer recovered No Replace the Main board YES END 1 1 Is the operator panel connected to the Control board properly No Connectthe operator panel properly Yes Is the connecting cord defective Yes Replace the connecting cord No Replace the operator panel assembly Is the printer recovered No Replace the Control board YES END Yes Is message shown in the LCD display No Replace the Control board YES LXX xxx message shown in the LCD display No Take the proper action following the message shown in the LCD display For details see the chapter 6 5 1 LCD STATUS message trouble list YES END Main control board AOLM PCB Fig 6 1 Connector and Pin Location Fl Ri C1 c2 c3 Fig 6 2 Measurement by a Multimeter Power Sensor board Fig 6 3 Connector a
71. lacement 3 1 Precautions for Parts Replacement Always practice good Anti Static procedures when handling equipment 1 Before starting parts replacement remove the AC cable and interface cable a Remove the AC cable in the following procedure i Turn off o the power switch of the printer ii Disconnect the AC inlet plug of the AC cable from the AC receptacle iii Disconnect the AC cable and interface cable from the printer b Reconnect the printer in the following procedure i Connect the AC cable and interface cable to the printer ii Connect the AC inlet plug to the AC receptacle iii Turn on I the power switch of the printer Disconnect 2 Do not try disassembly as long as the printer is operating normally 3 Do not remove unnecessary parts try to keep disassembly to a minimum 4 Use specified service tools 5 When disassembling follow the determined sequence Otherwise parts may be damaged 6 Since screws collars and other small parts are likely to be lost they should temporarily be attached to the orginal positions 7 When handling ICs such as microprocessors ROM and RAM and circuit boards always practice good anti static procedures 8 Do not place printed circuit boards directly on the equipment or floor Service Tools Service Tools Table 3 1 shows the tools required for field replacement of printed circuit boards and units Table 3 1 Service Tools Ee etum D
72. late BK R AOLM PCB IC cover 1 Turn the AC power switch off Unplug the AC power cord from the outlet 2 Remove side cover R see 3 3 5 3 Remove five screws 1 and eight connectors 2 Remove AOLM PCB 3 4 Remove two screws 4 Remove IC card cover 5 S 6 Remove four screws 6 Remove side plate R 7 by pulling up and out on top part of plate Remove the claws and then remove FG plate BK R 8 3 3 7 Stacker Cover Assy Damper Arm And Washer 3 3 7 Stacker cover Assy damper arm and washer 1 Turn the AC power switch off Unplug the AC power cord from the outlet 2 Remove the rear cover see 3 3 1 3 Remove the side cover R see 3 3 5 4 Remove the side plate R see 3 3 6 1 to 5 5 Disconnect the backup roller release lever 1 with the protrusion on the out side surface of the right side of the stacker cover 6 Remove screw 2 and washer 3 Remove two claws Remove stacker cover Assy 4 at this time the damper arm 5 is also removed 3 3 8 Damper 3 3 8 Damper 1 Turn the AC power switch off Unplug the AC power cord from the outlet 2 Remove the damper arm see 3 3 7 3 Remove two screws 1 and then remove two dampers 2 This hole is elongated When replacing damper be sure elongated hole is to rear of 1 963 3 9 Stacker Full Sensor Assy 3 3 9 Stacker full sensor Assy 1 Turn the AC power switch off Unplug the AC power cord from the outlet
73. lug 552274 1 AMP 552073 1 AMP or equivalent 2 Cable Cable length 6 ft 1 8 m max A Shielded cable composed of twisted pair wires is recommended for noise prevention The cable should be IEEE 1284 bi directional compliant Note Cable is not supplied Pin No Signal name Signal direction Functions 1 DATA STROBE gt PR Parallel data sampling strobe 2 DATA RIT 1 3 DATA BIT 2 4 DATA BIT 3 5 DATA BIT 4 PR Parallel input data 6 DATA BIT 5 7 DATA BIT 6 8 DATA BIT 7 9 DATA BIT 8 10 ACKNOWLEDGE PR Completion of data input or end of functioning 11 BUSY PR During print processing or during alarm 12 PAPER END 4 PR End of paper 13 SELECT PR Select state ON LINE 14 Auto Feed PR Request to change Mode 15 Nat used 16 ov Signal around 17 CHASSIS Chassis ground GROUND 18 45V PR 50 mA max 19 OV Signal ground Signal ground 30 31 INPUT PRIME PR Initializing signal 32 FAULT PR End of paper or during alarm 33 Ov Signal ground 34 Not used 35 High level 3 3 36 Select In PR Request to change Mode 4 Signal level e LOW 0 V to 0 8 V HIGH 2 4 V to 5 0 V 5 Specifications Item Description Mode Compatibility mode Nibble mode ECP mode Data bit length 8 bits Compatibility mode 4 bits Nibble mode 9 bits ECP mode Input prime Valid Invalid Receive buffer 8K 20K 50K 100K 1M Bytes Control Handshaking control is performed in each mode
74. modifying the program at the printer side The conceptual diagram of the OKI HSP interface is shown in Fig 2 2 Control board LON expansion board j race Fig 22 For the electrical physical characteristics of the OKI HSP interface see the OKI HSP interface technical manual This manual will not be available to the general public 8 RAM module Pin layout 1 36 37 72 Basic specificaton Type 72 pins SIIM 32 bits buss width Access time 60ns 70ns 80ns 100ns Capacity 1 2 4 8 or 16MB 16 MB RAM will not be sold by Okidata Parity None 962 2 Power Sensor Board 2 2 Power Sensor Board The power sensor board consists of an AC filter circuit a low voltage power supply circuit a high voltage power supply circuit heater drive circuit and photosensors 1 Low voltage power supply circuit This circuit generates the following voltages Output voltage Use 5 V Logic circuit supply voltage 30 V Motor and fan drive voltage and source voltage for 8 V high voltage supply RS 232C line voltage 8V RS 232C line voltage and analog circuit supply voltage 2 High voltage power supply circuit This circuit generates the following voltages necessary for electro photographic processing from 30 V according to the control sequence from the control board When cover open state is detected 30 V supply is automatically interrupted to stop the supply of all the high voltage
75. n remove guide rail R Assy 4 6 Remove cassette lock spring 5 and then remove bias link 6 and pull block 7 At this time earth plate 8 is also removed Pay attention the direction of hook of cassette lock spring 5 Remove spring 9 and then remove cassette stopper 10 Remove screw A and then remove detector spring B Remove screw C and then remove AOLS PCB D 0 Remove screws E from bias link 6 and then remove link support F 1 Remove two screws G and then remove square cord from square shaped connector H 2 Using great care remove connector cord from square shaped connector H 963 3 33 IC card cover 3 3 33 IC card cover 1 Turn the AC power switch off Unplug the AC power cord from the outlet 2 Remove interface cable 1 3 Open stacker cover 2 Remove two screws 3 and then remove IC card cover 4 1 2 n x e 963 3 34 LED head 3 3 34 LED head 1 Turn the AC power switch off Unplug the AC power cord from the outlet 2 Open stacker cover 1 3 Remove PC connectors 2 and two LED cables 3 from LED head 4 4 Push the hook on the left side of stacker cover 1 in the direction of arrow and remove LED head 4 Take care not to lose head springs 5 Pull out the head spring 5 from the post 963 3 35 Separator Assy 3 3 35 Separator Assy 1 Turn the AC power switch off Unplug the AC power cord from the outlet 2 Pull out the paper cassette Assy 1
76. nd Pin Location 962 1 Paper input jam 1st tray JAM error 2 1 Paper input jam 1st tray Does a jam error occur when the power is turned on Yes Is the paper at the inlet sensor lever Yes Remove the paper No Does the inlet sensor lever operate smoothly No Replace the inlet sensor lever Yes Clean the inlet sensor on the Power sensor board or replace the Power sensor board No Does jam error occur after paper feeding Yes sthe paper fed on the inlet sensor lever Yes Does the inlet sensor lever operate smoothly No Replace the inlet sensor lever Yes Clean the inlet sensor on the Power sensor board or replace the Power sensor board See Fig 2 3 Sensor Layout Diagram No Replace the hopping roller assembly or paper cassette assembly No Is the hopping roller rotating Yes Set the paper cassette properly No Is the hopping motor rotating Yes Replace the hopping roller gear one way or idle gear HF A No Are the cable and connector between the hopping motor and the Control board connected properly see chapter 7 1 No Connect each connector properly or replace the nylon connector cord white 9 pins Yes 15 the coil resistance normal resistance about 6 7 W of the hopping motor normal No Replace the hopping motor Yes Replace the Control board 962 2 Paper input jam front feeder 2 2 Paper input jam front feeder Does jam error occur when the power is turned on Yes sthe paper at theinlet sens
77. ng the power on while pressing the MENU key and reset the drum counter Users Manual Refer to After replacing the fusing unit assy set the printer in the engine maintenance mode by turning the power on while pressing the FORM FEED and ENTER keys and reset the fuser counter Refer to See 4 1 966 Print voids 6 Print voids Is the contact plate of the transfer roller contacted with the power sensor board properly See Figure 6 5 No Adjust the contact plate contact to contact the power sensor board properly and the shaft of the transfer roller Yes Replace the transfer roller See 3 3 36 Has the trouble been removed Yes End No Are the contacts of the toner supply roller developing roller image drum and charging roller contacted with the contact assy properly See Figure 6 5 A B C D E No Adjust the contacts to contact the contact assy properly Yes Replace the image drum cartridge Has the trouble been removed Yes End Note After replacing the image drum cartridge set the printer in the user maintenance mode by turning the power on while pressing the MENU key and reset the drum counter Refer to Users Manual No Is the LED head installed properly Check connector HEAD1 14p HEAD2 12 on the control board and PC Connec tor on the LED head No Install the LED head properly Yes Replace the LED head or the head cable Has the trouble been removed Yes End Note X After repl
78. nous Serial 5 I O error Error No 7 excepting time out between the printer and an optional tray 6 I F time out between the 6 printer and the operator panel 7 I F time out no response 5 between the printer and an optional tray High Capacity Second Paper Feeder Power envelope feeder etc 8 Messages cannot be received 7 through the parallel interface 9 Messages cannot be received 8 through the serial interface 10 Data cannot be received 9 through the OKI HSP interface Note When replacing the Control board install the EEPROM from the old Control board onto the new control board 1 The printer does not work normally after being turned on 1 The printer does not work normally after being turned on 3 8888568686888888 message shown in the LCD display for less than 1 second No Isthe AC cable connected properly No Connectthe cable properly No Isthe message 16 columns display only on the top row shown in the LCD display Yes Replace the Control board Yes Are the following voltages applied to the corresponding pins of the POWER connector on the Control board For the measuring points see Fig 6 1 Pin 15 8V Pin 16 8V Pins 19 20 30V Pins 21 22 26 29 OV Pins 23 25 5V No Remove the AC cable Set the POW switch to the ON position Measure the resistance between L and N pins of the AC inlet using a multimeter Is there cont
79. on scalable font information 4 EEPROM The EEPROM has a 4 kbit capacity and stores the following data Menu data Various counter data page counter drum counter fuser counter etc Adjustment parameters LED head drive time print start position etc 5 LSI MSM10S0050 015GS This LSI is connected to the CPU via the bus as a peripheral device of the CPU and controls the memory based on the RAS signal and address signal received from the CPU 6 LSI MBCE31701 040FP BND This LSI is used as a peripheral device of the CPU and performs smoothing compensation OST of print image data 300 dpi and 600 dpi In addition it transfers serially bit image data for each dot line to the LED head 7 Host interface This printer has the following interfaces to the host Centronics bidirectional parallel interface RS232C serial interface OKI HSP interface Option The single effective interface or the automatic interface select mode can be selected using the menu If the busy state of the printer continues for a long time period the buffer near full control releases the busy status at constant intervals even if the host side is busy so not to cause the interface time out at the host side a Centronics bidirectional parallel interface This is an interface conforming to IEEE 1284 and provides either unidirectional or bidirectional communications according to each of the following communication modes Comp
80. or lever Yes Removethe paper No Does the inlet sensor lever operate smoothly No Replacetheinlet sensor lever Yes Clean the inlet sensor on the Power sensor board or replace the Power sensor board SeeFig 2 3 Sensor Layout Diagram No Does a jam error occur after paper feeding Yes I sthe paper fed on the inlet sensor lever Yes Goto No Coto No Does the front feeder paper sensor lever operate smoothly No Replacethelever of the front feeder paper sensor Yes Clean the front feeder paper sensor Is the printer recovered YES END No Replace the front feeder paper sensor assembly No Isthe hopping roller rotating Yes Setthe paper properly No Is the hopping motor rotating Yes Replace the front feeder gear or idle gear 262 3 Paper feed jam 2 3 Paper feed jam Does a paper feed jam occur when the power is turned on Yes sthe paper on the paper sensor lever Yes Removethe paper No Doesthe paper sensor lever operate smoothly No Replacethe paper sensor lever Yes Clean the paper sensor SeeFig 2 3 Sensor Layout Diagram Is the printer recovered No Replacethe Power sensor board YES END No Has the paper reached the paper sensor lever No Istheregistration motor rotating No Isthere any defective gear in the motor bracket assembly Yes Replacethe defective gear No Arethe connections for CN3 connector on the Power sensor board between CN8 and CN7 connectors on the Control board and registra
81. ote X After replacing the LED head set the printer in the engine maintenance mode by turning the power on while pressing the FORM FEED and ENTER keys Set the LED head drive time Refer to Section 4 2 Yes Replace the image drum cartridge Has the trouble been removed Yes End Note After replacing the image drum cartridge set the printer in the user maintenance mode by turning the power on while pressing the MENU key Reset the drum counter Refer to Users Manual No Replace the control board or power sensor board WO E Wes pe RN Dg S es SSS Chapter 7 7 Wiring Diagram 7 WIRING DIAGRAM 7 1 Interconnect Signal Diagram 7 2 PCB Layout 7 2 PCB Layout 1 Control board AOLM 2 board 907 3 Resistance Check 7 3 Resistance Check Between pins 1 and 2 670 Between pins 3 and 4 6 752 Betworn pins 1 and 2 4 30 Between pins 3 and 4 4 30 Between pias 1 and 2 220002 at 25 C Between pins 3 and 4 2 30 120V asa 2404 Between pins 1 2792 670 967 4 Short Plug Setting 7 4 Short Plug Setting 1 Control board AOLM et 5 175 LL Short plug Plug setting Description Factory setting 1 2 5 V is supplied to pin 18 of Centronics parallel I F connector 1 2 T1 2 3 5 V is not supplied to pin 18 of Centronics parallel I F connector T2 1 2 CE
82. ownload table This function selects the download table for the High Capacity Second Paper Feeder 9 Setting of Power envelope feeder paper feed length This function sets the paper feed length of the Power envelope feeder 10 Selection of Power envelope feeder download table This function selects the download table for the Power envelope feeder 11 Fuser count display Displays on the LCD the total number of printed pages counted at the engine 12 Fuser count reset When the fuser unit is replaced the maintenance person uses this fuser count reset function to reset the fuser lifetime After the fuser counter is reset the engine enters into the operation mode automatically 13 Engine reset All EEPROM areas used by the engine are reset to the factory default values The following items are excluded Menu level 1 Menu level 2 Operator panel menu disable enable Page print disable enable Transition to the operation mode occurs upon completion of resetting Note Do not change the default value of 2 5 9 they are the parameters for adjusting in the factory Engine maintenance mode menu system Engine maintenance mode menu system Writing into the EEPROM is performed when the Enter key is pressed Writing into the EEPROM is performed when the Enter key is pressed 0 5 mm intervals 1mm intervals Writing into the EEPROM is performed when the Enter key is pressed Hote Do not
83. plying a DC minus voltage to the charge roller that is in contact with the image drum surface Charge roller 4 Exposure 4 Exposure Light emitted from the LED head irradiates the image drum surface with negative charges The surface potential of the irradiated part of the image drum drops thereby forming an electrostatic latent image associated with the image signal Image drum Imaga drum 5 Developing b Developing Toner is attracted to the electrostatic latent image on the image drum surface to convert it into a visible toner image Developing takes place at the contact between the image drum and the developing roller 1 As the toner supply roller rotates while rubbing on the developing roller a friction charge is generated between the developing roller and the toner allowing the toner to be attracted to the developing roller The developing roller surface is charged positive and the toner negative Doctor b bude Charge roller Toner sup ply roller Develo ping roller Image drum 2 The toner attracted to the developing roller is scraped off by the doctor blade forming a thin coat of toner on the developing roller surface 3 Toner is attracted to the exposed part low potential part of the image drum at the contact between the image drum and the developing roller making the electrostatic latent image visible 6 Transfer 6 Transfer The transfer roller is composed of con
84. r see 3 3 1 1 to 3 2 Disengage the plate and frame on both sides 3 Remove the separator assy see 3 3 1 4 to 5 4 Remove the AOLE PCB see 3 3 2 b Remove the motor bracket assy see 3 3 5 6 Remove the gear 1 7 Shift the roller B 2 to the right lift it by holding on its left side and pull it out to the left side The bearing 3 also comes off at the same time so be careful not to lose it Pay special attention to make sure that you do not damage the sensor lever 4 while going through this procedure 263 3 7 Roller A 3 3 7 Roller A Remove the motor bracket assy see 3 3 5 Remove two gears 1 and then another gear 2 Disengage the plate 3 and the frame 4 Remove four screws 5 and remove the frame 4 see 3 3 6 Move the belt to the right and remove it from the one way pulley 6 Move the carrier roller assembly to the right and remove it from the shaft 7 Move the roller A 8 to the right lift its left side and then pull it off to the left Be careful not to lose the shaft 7 being removed together Carrier roll 963 3 8 Mini pitch belt amp Feed roller 3 8 8 Mini pitch belt amp Feed roller 1 2 3 4 2 Baw wa Remove the roller A see 3 3 7 Remove the bearing 1 and remove the feed roller assy 2 Remove two bearings 3 and remove the plate 4 Remove the mini pitch belt 5 and the feed roller 6 4 Troubleshooting 4 TROUBLESHOOTING
85. r Envelope Feeder Also check to see if there wasa feeding of multiple sheets Carry out the recovery printing by opening the cover removing paper and closing the cover and then turning the error display off Tray paper out Notifies of no paper Load the paper in the state of the Power Power Envelope Envelope Feeder Feeder Synchronous Notifies of occurrence Verify serial I O error of interface error between the printer and the Power Envelope Feeder connection of AOLE PCB and square shaped connector Replace the square shoped connector if necessary Replace AOLE PCB Interface Timeout Notifies of occurrence of interface timeout between the printer and the Power Envelope Feeder Verify connection of AOLE PCB and square shaped connector Replace the square shaped connector if necessary Replace AOLE PCB 4 3 2 Troubleshooting Flow 4 3 2 Troubleshooting Flow JAM error Paper Input Jam Does paper jam at the inlet when the power is turned on YES Is the paper located above the sensor plate Inlet YES Remove the paper NO Is the sensor plate Inlet operating normally NO Replace the sensor plate Inlet YES Replace the power sensor board or inlet sensor t NO When the paper is fed in does the paper input jam occur YES Is the paper being fed to above sensor plate Inlet YES Is the sensor plate Inlet operating normally NO R
86. r as possible 3 Perform inspections in conditions close to those in which the problem had occurred 966 2 Points to Check before Correcting Image Problems 6 2 Points to Check before Correcting Image Problems 1 Is the printer being run in proper ambient conditions 2 Have the supplies toner and the routine replacement part image drum cartridge been replaced properly 3 Is the paper normal See paper specifications section 4 Has the image drum cartridge been loaded properly 966 3 Tips for Correcting Image Problems 6 3 Tips for Correcting Image Problems 1 Do not touch or bring foreign matter into contact with the surface of the image drum 2 Do not expose the image drum to direct sunlight 3 Keep hands off the fuser unit as it is heated during operation 4 Do not expose the image drum to light for longer than 5 minutes at room temperature 966 4 Preparation for Troubleshooting 6 4 Preparation for Troubleshooting 1 Operator panel display The failure status of this printer is displayed on the liquid crystal display LCD in the operator panel Take proper corrective action as directed by messages that are displayed on the LCD 966 5 Troubleshooting Flow 6 5 Troubleshooting Flow If troubles should develop in this printer troubleshoot in the following procedure flow Troubles indicated by LCD message Troubleshoot from the LED status message list See
87. rator assy 4PP4076 5317G1 1 1 3 6 53346301 10 Idle gear Idle gear 1 0 3 6 51234801 11 Hopping motor 4PB4076 5330P1 1 1 3 6 56511701 12 Connector cord 4YS4011 4448P2 1 2 5 10 56730802 13 Square shaped 220A1866P0221 1 2 5 10 56730621 connector 22P 14 Square shaped 220A1866P0140 1 2 5 10 56730640 connector 14P 15 Switch assy 4PB4078 1412P1 1 2 5 10 56212901 16 Cover lock lever 3PP4076 5389P1 1 0 3 6 17 Spring Separator 4LB 190500 5 2 1 3 6 18 FF spring 4PP4043 4742P1 2 1 3 6 19 Spring Lock lever 4PP4076 5391P1 1 0 3 6 20 Bearing F 4PP4076 5308P1 2 1 3 6 51608201 Base Unit Base Unit T T T N T 00 o INI o A N 5 859 o T T e eo e 1 0 10 wo o N T T T T T o e o o gt pan n n e rio Oo LO T LO LO x eo O TJD oO 2 N oOoil o o st oO n n n a gt o x 0 5 T o B amp a 0 55 als 21 0 Lo 6 Pressure coil spring 4PP4043 4526P1 6 12 50928801 7
88. re No 1 100 Philips 2 25 mm screws Set Se creo river No 2 200 Philips 3 5 mm screws um ETE screwdriver Mag netized EE ci LED Head ckaner Clans LED head PIN 4PB4083 2248P1 Discon rector for Discon rect cack in connector deck in connector 4PP4 76 5385P1 3 2 Parts Layout 1 4 3 2 Parts Layout 1 4 ij Main Control i Board AOLM PCB Manual feed hopper assy Base unit Figure 3 1 Parts Layout 2 4 Parts Layout 2 4 LED head Front ug Fusing 4 Eject Ne 5 E el SEZ Nain chassis A WM DC fan motor I D unit Hopping roller assy Parts Layout 3 4 Parts Layout 3 4 i lt a 2 Parts Layout 4 4 Parts Layout 4 4 AOLC PCB Relay Drive board Power Sensor board AOLS PCB Guide rail L assy 963 3 How To Change Parts 3 3 How to Change Parts This section explains how to change parts and assemblies appearing in the disassembly diagram below Poirier Lint cover Load 022 DC fan motor 033 Maral feed hopper assy 3 3 4 Side cower a er 0236 Slacker cover assy 037 Damper 338 Stacker full sensor 339 IC card cower 333 Cable cover 0319 LED head 3334 Eject roller Separator assy 333 Pipe supply guide D 33 12 Separator F 23 13 Transfer roter 33 36 Foeni feeder roller assy mater 33
89. rge roller 2 Exposure Light emitted from the LED head irradiates the negatively charged surface of the image drum The surface potential of the irradiated part of the image drum surface is lowered so that an electrostatic latent image associated with the print image is formed 3 Developing and toner recovery When the negatively charged toner is brought into contact with the image drum it is attracted to the electrostatic latent image by static electricity making the image visible At the same time the residual toner on the image drum is attracted to the developing roller by static electricity 4 Transfer When paper is placed over the image drum surface and a positive charge opposite in polarity to the toner is applied to the reverse side of the paper from the transfer roller the toner is attracted by the positive charge and is transferred to the paper As a result the toner image formed on the image drum is transferred to the paper 5 Temporary cleaning Residual toner that remains on the image drum without being transferred is made uniform by the cleaning roller and is temporarily attracted to the cleaning roller by static electricity 6 Fusing The toner image transferred to the paper is fused under heat and pressure Figure 2 6 shows an electro photographc process timing chart oz ambi Paper ajact LI 1 RM ON Hopping Ma _ i oe INSNS j a aa o mcr i i i i Fond start Sen
90. s About 220 kW at room temperature 25 C See chapter 7 3 for the measuring points Yes Replace the fuser unit A No Does the thermistor contact touch the contact assembly properly when the fuser unit is mounted in the printer See Fig 6 5 No Adjust the thermistor contact so as to touch the contact assembly properly Yes Does appear the heat on signal at pin 31 HEAT ON signal 0 V in normal state of the Control board No Replace the Control board Yes Replace the Power sensor board No Does a fuser unit error occur after more than 90 seconds from the power on No Goto Yes Turn the power OFF ON Is the heater of the fuser unit turned on When the heater is turned on heat is radiated B Yes Does the thermistor contact touch the contact assembly properly when the fuser unit is mounted in the printer See Fig 6 5 No Adjust the thermistor contact so as to touch the contact assembly properly t To on the next flow To on the next flow From on the preceding flow Yes Replace the fuser unit Is the printer recovered No Replace the Power sensor board or Control board YES END No Is the heater or thermistor open Measure the resistance between the heater contacts normal resistance 220 kW 25 C between pins 1 and 2 2 3 W 120 V and 8 5 W 240 V between pins 3 and 4 See chapter 7 3 Yes Replace the fuser unit No Is the AC voltage applied to the CN2 connector on the Power sensor board
91. see 3 3 5 Remove the side plate R see 3 3 6 1 to 5 Remove the stacker cover Assy see 3 3 7 Remove the front feeder roller Assy see 3 3 12 1 to 3 At this time it is not required to remove the manual feed hopper Assy 8 Remove the earth plate HP 9 Lift gear TR 1 to unlock it Remove gear TR 1 and transfer roller 2 At this time two bearings TR 3 and two transfer springs 4 are also removed NOTE Do not lose bearings or springs 10 Remove connector cover 5 in direction of arrow and then remove two connectors 6 and 7 11 Remove the DC Fan motor 12 Remove eight screws10 and then remove main chassis unit A 2 3 4 5 6 7 3 3 18 Registration Roller 3 3 18 Registration roller 1 Turn the AC power switch off Unplug the AC power cord from the outlet 2 Remove the front feeder roller Assy see 3 3 12 1 to 3 3 Remove four screws 1 Lift and remove the registration roller Assy 2 left side first then right side 4 Release the latch and remove registration roller gear 3 and pressure roller gear 4 5 Remove left and right side registration roller bearing Assys 5 and then remove resist roller 6 and pressure roller 7 963 3 19 Drum Motor 3 3 19 Drum motor 1 Turn the AC power switch off Unplug the AC power cord from the outlet Remove the main chassis unit see 3 3 17 Remove the registration roller Assy see 3 3 18 1 to 3 Remove fuser Assy
92. ser counter Refer to Chapter 4 2 2 EEPROM Set the LED head drive time Refer to Chapter 4 2 1 964 2 1 Setting of LED head drive time 4 2 1 Setting of LED head drive time Note When the luminous intensity marking of the replaced LED head new part is same as that of the used LED head old part do not set the LED head drive time Luminous intensity marking label TaHHBE Setting of LED head drive time Drive time of the LED head is to set parameter of drive time setting values corresponding to the lumious intensity displays marked on the LED head to EEPROM a Corresponding table of lumious energy display and drive time parameter Luminous intensity Drive time display on LED parameter head 0 27 0 28 25 0 29 0 30 24 0 31 0 32 23 0 33 0 35 22 0 36 0 37 21 0 38 0 40 20 0 41 0 43 19 0 44 0 46 18 0 47 0 49 17 0 50 0 52 16 0 53 0 57 15 0 58 0 60 14 0 61 0 64 13 0 65 0 69 12 0 70 0 73 11 0 74 0 79 10 0 80 0 84 9 0 85 0 90 8 0 91 0 96 7 0 97 1 03 6 1 04 1 10 5 1 11 7 1 18 4 1 19 1 26 3 1 27 1 35 2 b Setting Example Setting method the parameter to 14 in case of privous parameter is 17 Last 3 digits indicate the LED head marking number Luminous intensity marking 4 2 2 Resetting the fuser counter 4 2 2 Resetting the fuser counter 1 The
93. sor QUT Sensor OFF Fead stop Direction of rotation of the Image drum 2 4 3 Process Operation Descriptions 2 4 3 Process operation descriptions 1 Hopping Hopping from the first tray and the front feeder are effected by a single hopping motor in the mechanism shown below Hopping Motor Front Feeder First Tray Turning the Hopping motor in the a direction drives the hopping roller of the first tray Turning the Hopping motor in the b direction drives the Hopping roller of the front feeder The both and hopping gears contain one way bearing so that turning each of these gears in reverse direction will not be transmitted to the corresponding roller Hopping Motor Onevay Clutch Gar Hopping Roller Front Feeder us 2 1 4 Registration Roller Hopping Roller First Tray One way Clutch Ger a Hopping 1st tray 1 Rotating the pulse motor in the direction a Clock wise direction drives the hopping roller of the first tray to advance the paper until the inlet sensor turns on At the same time the one way clutch gear B also rotates However the hopping roller of the front feeder will not rotate due to the one way bearing 2 After turning on the inlet sensor the paper advances further by a predetermined length until it hits the registration roller The skew of the paper can thus be corrected Hopping Roller Fro nt feeder Registration Poller Ho pp ing Ro ler ist Tray
94. ssy 3 3 6 Side frame L assy 1 Remove the hopping roller see 3 3 5 2 Remove three screws 1 and remove the upper plate 2 3 Remove two screws 3 and remove the side frame L assy 4 4 Remove the cassette lock spring 5 link 6 pull block 7 note the directions of the hooks of the cassette lock spring 5 5 Remove the spring 9 and cassette stopper 0 6 Remove the screw A and remove the link support B 963 3 7 Side frame R assy 3 3 7 Side frame R assy 1 Remove the hopping roller see 3 3 5 2 Remove three screws 1 and remove the upper plate 2 3 Remove two screws 3 and remove the side frame R assy 4 4 Remove the cassette lock spring 5 link 6 pull block 7 and earth plate 8 note the directions of the hooks of the cassette lock spring 5 5 Remove the spring 9 and remove the cassette stopper 0 6 Remove the screw A and remove the link support B 7 Remove the screw C and remove the detector spring D 8 Remove the screw E and remove the AOLD PCB F 4 Troubleshooting 4 TROUBLESHOOTING 4 1 Precautions Prior to the Troubleshooting 1 Use the basic trouble shooting steps provided in the Operator Guide 2 Obtain detailed information concerning the problem from the user 3 Try to recreate the conditions similar to that in which the problem occurred 4 2 Preparations for the Troubleshooting 1 Display on the Operator panel The status of the problem is displayed on t
95. the Main board AOLM PCB LCD Status Messages 4 4 Error Controller Onz xxxxx LCD Status Messages 4 4 Proccesor errors EH c c On 44444444 AT vara Exception Error code Remedy 4 Address Error Exception See Below Lead instruction instruction fetch 5 Address Error Exception Store instruction See Below 6 Bus Error Exception Instruction Fetch See Below 7 Bus Error Exception See Below Load instruction store instruction 7 Bus Error Exception See Below Load instruction store instruction 8 System Call Exception See Below 9 Breakpoint Exception See Below A Reserved Instruction Exception See Below B Coprocessor Unusable Exception See Below C Arithmetic Overflow Exception See Below Turn the power off then on Replace the Control board Note When replacing the Control board install the EEPROM mounted on the replaced Control board 966 5 2 LCD message troubleshooting 6 5 2 LCD message troubleshooting If problems are not correctable from the LCD message trouble list follow the troubleshooting flowcharts given here to deal with them No Trouble Flowchart number 1 The printer does not work 1 normally after being turned on 2 Jam alarm Paper input jam 1st Tray 2 1 Paper input jam Front 2 2 feeder 2 3 Paper feed jam 2 4 Paper exit jam 3 Paper size error 3 4 Fusing unit error 4 5 SSIO Synchro
96. the control board or Power Sensor board 4 Black belts or stripes in the vertical direction 4 Black belts or stripes in the vertical direction Replace the image drum cartridge Has the trouble been removed Yes End Note After replacing the image drum cartridge set the printer in the user maintenance mode by turning the power on while pressing the MENU key and reset the drum counter Refer to User s Manual No Replace the LED head Has the trouble been removed Yes End Note X After replacing the LED head set the printer in the engine maintenance mode by burning the power on while pressing the FORM FEED and ENTER keys Set the LED head drive time Refer to Section 4 2 No Replace the control board or power sensor board 965 Cyclic error 5 Cyclic error Image drum Developing roller Toner supply roller Charging roller Cleaning roller Transfer roller Heat roller Back up roller Notes 1 Frequency 3 71 2 50 94 2 mm 63 5 mm 2 13 54 0 mm 1 73 43 9 mm 1 48 37 6 mm 2 30 58 4 mm 3 49 88 5 mm 3 52 89 5 mm Remedy Replace or clean the image drum cartridge Replace the image drum cartridge Replace the image drum cartridge Replace the image drum cartridge Replace the image drum cartridge Replace the transfer roller Replace the fusing unit assy Replace the back up roller After replacing the image drum cartridge set the printer in the user maintenance mode by turni
97. the front feeder Assy see 3 3 12 1 to 3 5 Remove the inner cover and square shaped connector see 3 3 13 5 and 6 6 Remove hopping motor 1 from the square shaped connector 7 Remove the paper supply guide A see 3 3 13 7 to 10 8 Remove the lever R see 3 3 10 6 9 Remove two screws 2 and then remove side plate R Assy 3 10 Remove two screws 4 and then remove hopping motor 1 963 3 16 Front Feeder Paper End Sensor 3 3 16 Front feeder paper end sensor 1 Turn the AC power switch off Unplug the AC power cord from the outlet 2 Remove the manual feed hopper Assy see 3 3 4 3 Remove the side cover R see 3 3 5 4 Remove the front feeder roller Assy see 3 3 12 1 to 3 5 Remove the side plate R Assy see 3 3 15 1 to 9 6 Remove the connector of front feeder paper end sensor 1 from the square shaped connector 7 Remove two screws 2 and then remove paper supply guide C 3 8 Remove paper supply guide B 4 9 Remove four claws and then remove front feeder paper end sensor 1 10 Remove two screws 5 and then remove square shaped connector 6 from paper supply guide C 3 Note Use great care when removing the sensor 963 3 17 Main Chassis Unit 3 3 17 Main chassis unit 1 Turn the AC power switch off Unplug the AC power cord from the outlet Remove the rear cover see 3 3 1 Remove the contact Assy see 3 3 2 Remove the side cover R
98. tion motor and for POWER connector and FRONT connector white 9 pin or 7 pin connector made properly No Connect these connectors properly If a defective cableis found replace the defective cable Yes Isthecoil resistance normal resistance 6 7 W of the registration motor normal No Replacethe registration motor Yes Replacethe Driver board Isthe printer recovered No Replacethe Control board YES END Go to on the next flow t Goto on the next flow From the preceding From on the preceding Yes Istheimage drum set properly No Se the image drum properly Yes n case of paper feed from the front feeder check the hopping roller of the front feeder assembly case of paper feed from the tray check the hopping roller assembly and the tray Yes Has the paper reached the outlet sensor lever Yes Does the outlet sensor lever operate smoothly No Replacethe outlet sensor lever Yes Clean the outlet sensor on the Power sensor board SeeFig 2 3 Sensor Layout Diagram Is the printer recovered No Replacethe Power sensor board YES END No Is the drum motor rotating No Isthere any defective gear in the motor bracket assembly Yes Replace the defective gear No Arethe connections for CN3 connector on the Power sensor board between CN8 and CN6 connectors and drum motor and for POWER connector and FRONT connector white 9 pin or 7 pin connector on the Control board made properly
99. utive Envelope A4 A5 B5 A6 Applicable sizes Width 3 4 to 8 5 86 to 228 mm Length 5 5 to 14 140 to 355 6 mm Thickness Automatic feed 16 to 28 16 60 to 105 g m 2 Manual feed Label OHP paper transparency Envelope 6 Printing speed First print 12 sec Continuous print 12 sheets min Warm up time 90 sec at room temperature 77 F 25 C and rated voltage 120 VAC 7 Paper feed method Automatic feed or manual feed 8 Paper delivery method Face down face up 9 Resolution 600 x 600 dots inch 10 Power input 120 VAC 5 5 15 ODA 230 240 VAC 10 14 ODA OEL 11 Power consumption Peak Approx 600W Typical Operation Approx 220W Idle Approx 100W Power save mode Approx 20W 12 Temperature and humidity During operation 50 to 90 F 10 to 32 C In storage 14 to 110 F 10 to 43 C 13 Noise During operation 50 dB A or less At standby 45 dB A or less Power save mode 43 dB A or less 14 Consumables Toner cartridge kit 5 000 596 duty Image drum cartridge 30 000 at continuous printing 20 000 3 page job 15 000 1 page job 961 5 Safety Standards 1 5 Safety Standards 1 5 1 Certification label The safety certification label is affixed to the printer in the position below 1 5 2 Warning Label 1 5 2 Warning label The warning label is affixed to the portion which may cause an injury to human body Follow the instructions on warning labels during maintenance CAUTIOW MOT
100. y the signal from the control board It drives the registration roller 4 Drum motor This drum motor is a pulse motor of 48 steps rotation that is two phase excited by the signal from the control board and is the main motor of this mechanism 5b LED head Image data for each dot line from the control board is received by the shift register and latch register The 5120 LEDs are driven to radiate the image data to the image drum 6 Fuser The fuser consists of a heater a heat roller a thermistor and a thermostat An AC voltage from the power supply board is applied to the heater under the control of the HEATON signal from the control board This AC voltage heats the heater The control board supervises the heat roller temperature via the thermistor and regulates the heater roller at a predetermined temperature 185 188 C by connecting or disconnecting the AC voltage supply to the heater If the heater roller temperature rises abnormally the thermostat of the heater voltage supply circuit is activated to cut the AC voltage supply forcibly 2 4 2 Electro Photographic Process 2 4 2 Electro photographic process The electro photographic processing is outlined below Figure 2 5 shows the electro photo graphic printing process Hopping Roller Registration Motor Image Drum Unit Figure 2 4 1 Charging The surface of the image drum is uniformly charged with negative charges by applying a negative voltage to the cha

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