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Epson 750 Printer User Manual

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1. Symptom Condition Cause Check Point Solution Paperis Malfunction of Check if the ASF idees x not fed ASF drive gear rotates 9 A ASF drive change over visually Abnormal change over Hed Clean the PF ceang Page Check if the PF roller by the heading Friction of the roller slips during cleaning sheet position is PF roller the paper Replace the PF wrong feeding roller if it does not recover Check the signal ASF sensor is level of the ASF Replace ASF defective sensor sensor PE sensor is Check the signal F level of the PE defective SEN Replace PE sensor HP sensor is Check the signal level of the HP defective sensor ma l Fatal error Head FFC is E Connect the stops auring disconnected head FFC initialization 9PPears connected Replace the CR Check the CR motor if there is CR motor is motor cable is no problem in defective connected the cable connection Replace the PF Check if the PF motor if there is PF motor is j motor cable is no problem in defective connected the cable connection Unit Repair Printer Mechanism 49 EPSON Stylus Photo 750 Revision A 4 1 Overview This section describes procedures for disassembling the main components of EPSON Stylus Photo750 Unless otherwise specified disassembly units or components can be reassembled by reversing the disassembly procedure Precautions for any disassembly or assembly
2. Maintenance Head Cleaning CL2 Adjustment A4 Check Pattern Market Destination Check Ink Charge Flag Reset Head Angular Adjustment Transportation Liquid Charge Bi D Adjustment Protection Counter value 7 Select Perform if Printer is not ready message is not indicated Figure 5 3 Options in the Program and Keys to Use Head Voltage ID Input adj3 After this screen menu screen will appear Each function on the main menu can be executed by ESC and ENTER keys Adjustment Adjustment by Adjustment Program 81 EPSON Stylus Photo 750 Revision A 5 3 2 Setting Destination Information 1 Select Adjustment on the main menu and press Return key Program goes to the adjustment menu FS ic Dor Prompt ST750 ioe EPSON ty lee Photo ISDEM Versioe 1 0 eo HERWICE TERS Maintenance Y lt lt Piint Ad Patian gt Esn mit Upon arrmem 5eledt Enter 0K 2 Select Market Destination Check and press Return key 3 The screen shows Checking the present Market Destination Press Return key Then screen will indicate Market Destination is Standard for World 4 Go back to the adjustment menu by pressing ESC key If you want to change the destination go back to the menu to input the model name Reset by changing the model name Adjustment 2 uo Prompt SP750 beeeeeeeees EPSOM Stylus Photo TEO 4 Ad jos tment Haad Actuate Voltage ID lng H
3. Condition Paper Ink End Ink End Check Black Color No Paper Ta On S Set papers Paper Jam Blink Off Off Removed the jammed paper Close the cartridge Ink End No cover correctly or Cartridge black y On replace the ink cartridge with new one Close the cartridge cover correctly or On replace the ink cartridge with new one Ink End No Cartridge color Replace with a new ink Ink Low black zs E Blink zs cartridge Replace with a new ink Ink Low color Blink cartridge Replace the waste ink pad and reset Maintenance EEPROM and Timer Request Blink Blink Blink Blink IC See Special Setting Mode on page 22 Turn Off and back On the printer If it does not recover repair the related units Fatal Error Blink Blink On On Troubleshooting Overview 40 EPSON Stylus Photo 750 Revision A Printer does not operate 3 2 Unit Level Troubleshooting 1 This section contains the flow charts which are used to isolate the faulty unit by following the flow chart according to the problem caused during replacing or repairing the unit You are to identify the faulty unit based on the primary symptom listed in the Table3 4 After this refer to 3 4 START Unit Repair and find and replace the defective parts Is AC power voltage p Input normal normal NO power supply YES Table 3 4 Symptoms and Correspondi
4. EPSON Stylus Photo 750 Revision A 2 2 2 2 Reset Circuit Reset circuit consists of reset timer IC IC8 and peripheral elements The reset timer IC prevents the CPU from running away which is caused by the unstable voltage 5VDC line voltage is less than 4 3V in the logic line during the power ON OFF operation Also IC sends the reset signal to the CPU and gate array when 42VDC line voltage is less than 35 5V IC 2 E05B588 op05 Figure 2 5 Reset Circuit Operating Principles Operating Principles of Electric Circuit 33 EPSON Stylus Photo 750 Revision A 2 2 2 3 Sensor Circuit The following sensor circuits are mounted on the C259 Main Control Circuit O HP Sensor ice HP sensor uses the photo interrupter method A HP sensor detects E05B58 the carriage home position It is used for managing printing position and cleaning etc SWAO O PE Sensor PE sensor uses the photo interrupter method A PE sensor determines if there is a paper in the printer Based on the signal from this sensor a particular page edge treatment such as Micro weave printing is performed O ASF Sensor ASF sensor uses the photo interrupter method An ASF sensor detects the position of return lever when the power is turned on and causes the paper to be picked up by the pick up roller fro the normal initial position O Thermistor Sensor TH This sensor is mounted on the print head board and measures the temperature around the head It
5. 6 1 Overview This section describes the points and procedures for maintaining the printer in its optimum condition 6 1 1 Cleaning This printer has no mechanical components which require regular cleaning Therefore note that points suggested below are only to check for dirt and perform appropriate cleaning if necessary B Never use chemical solvents such as thinner to clean the printer These chemicals can damage the components of the printer B Becareful not to damage the components when you attempt to clean the inside the printer W Do not scratch surface coated part of Roller Assembly PF Use soft brush to wipe off any dusts Use a soft cloth moistened with alcohol to remove the ink stain O Exterior parts Use a clean soft cloth moistened with water and wipe off any dirt If the exterior parts are stained with ink use a cloth moistened with neutral detergent to wipe it off O Inside the printer Use a vacuum cleaner to remove any paper dust Maintenance Revision A 6 1 2 Service Maintenance If the print irregularity missing white line etc has occurred or the printer indicates Maintenance Request Error take the following actions to clear the error O Head Cleaning The printer has a built in head cleaning function and is activated through the control panel operation 1 Confirm that the printer is in stand by state the Power indicator is not blinking and press Cleaning button 2 The
6. B Printing should be performed at room temperature for transparency and envelope O Cut Sheet W Size A4 Width 210mm 8 3 x Length 297mm 11 7 Letter Width 216mm 8 5 x Length 279mm 11 0 Legal Width 216mm 8 5 x Length 356 mm 14 0 Statement Width 139 7mm 5 5 x Length 215 9mm 8 5 B5 Width 182mm 7 2 x Length 257 mm 10 1 Executive Width 184 2 mm 7 25 x Length 266 7mm 5 5 Photo Paper Width 101 6mm 4 x Length 152 4mm 6 Product Description W Thickness 0 08mm 0 003 0 11mm 0 004 M Weight 64g m 17lb 90g m 24Ib B Quality Exclusive paper Bond paper PPC O Transparency and Glossy Paper W Size A4 Width 210mm 8 3 x Length 297mm 11 7 Letter Width 216 mm 8 5 x Length 279mm 11 0 W Thickness 0 075mm 0 003 0 085mm 0 0033 Note Transparency printing is only available at normal temperature O Envelope W Size No 10 Width 241mm 9 1 2 x Length 104 8mm 4 1 8 DL Width 220mm 8 7 x Length 110mm 4 3 C6 Width 162mm 6 4 x Length 114mm 4 5 W Thickness 0 16mm 0 006 0 52 mm 0 02 W Weight 45g m 12lb 75g m 20lb Quality Bond paper Plain paper Air mail Note Envelope printing is only available at normal temperature Keep the longer side of the envelope horizontally at setting O Index Card W Size A6 Index Card Width 105mm 4 1 x Length 148mm 5 8 Ab Index Card Width 148mm 5 8 x Length 210mm 8 3 5x8 Index Card
7. ESC ESC i 12 EPSON Stylus Photo 750 Revision A W Dotsize control ESC e B Raster header ESC D W Raster body ESCi O Color W Printing Color ESC r ESC r O EEPROM control m EEPROM control ESC Product Description General Description 13 EPSON Stylus Photo 750 Revision A 1 3 Parallel Interface ERROR signal is at low level when the printer is in one of the following states This printer has IEEE 1284 parallel interface RS 423 serial interface Printer hardware error fatal error and USB interface as standard Paper out error Paper jam error 1 3 1 Parallel Interface Forward channel SU PEE TOT Forward channel is the mode to transfer the ordinary printing order to PE signal is at high level during paper out error the printer side from the PC side Table 1 7 Connector pin assignment and signals Table 1 6 Parallel I F FID Signal Return In Out Function Description UM No Name GND pin Item Specification EE ES The strobe pulse Read in of data is Transmission mode 8bit parallel IEEE 1284 compatibility mode 1 STROBE 19 In performed at the falling edge of this Synchronization By STROBE pulse pulse Handshaking By BUSY and ACKNLG signal The DATA 0 through DATA7 signals represent data bits 0 7 Signal Level TTL compatible level 2 9 Data0 7 20 27 In respectively Eacj signal is at high when data is logical 1 and low level when data Adaptable connector 57 30360 amphenol or equi
8. L1 Notice All rights reserved No part of this manual may be reproduced stored in a retrieval system or transmitted in any form or by any means electronic mechanical photocopying or otherwise without the prior written permission of SEIKO EPSON CORPORATION All effort have been made to ensure the accuracy of the contents of this manual However should any errors be detected SEIKO EPSON would greatly appreciate being informed of them The contents of this manual are subject to change without notice All effort have been made to ensure the accuracy of the contents of this manual However should any errors be detected SEIKO EPSON would greatly appreciate being informed of them The above not withstanding SEIKO EPSON CORPORATION can assume no responsibility for any errors in this manual or the consequences thereof EPSON is a registered trademark of SEIKO EPSON CORPORATION General Notice Other product names used herein are for identification purpose only and may be trademarks or registered trademarks of their respective owners EPSON disclaims any and all rights in those marks Copyright 1998 SEIKO EPSON CORPORATION Printed in Japan PRECAUTIONS Precautionary notations throughout the text are categorized relative to 1 Personal injury and 2 damage to equipment DANGER Signals a precaution which if ignored could result in serious or fatal personal injury Great caution should be exercised in performing procedures prec
9. can forcibly solve the clogged nozzle problem caused by viscous ink Auto ai ES TE A t Prompt SP750 1 Select Maintenance on the Main Menu and press Return key DESIT NN haid lawing 2 Select Head Cleaning and press Return key LU fel clemeing OL will be done in this mda gt gt Prompt SP750 Auto 7 Ea mE A ebb POOH EIL BAI ELE UP rs MUTILBIUN ee ic Maintenance Y Eso Pravilima Batar UK E TT Transpo tat lon Ligekd Marge Indication OF The Gounter Yalue For The Beate Ink Pad adj16 4 After the cleaning is completed press ESC key until the screen returns to the Maintenance Menu B Since the head cleaning consumes a lot of ink Foo Pravidia Up Teen aria Goloet Enter 0K CAUTION avoid excessive cleaning B Ink quantity that is used for the cleaning differs according to the previously printed lines or ink RT jaa Return k quantity left in the ink cartridge bdo d e e sepes muse UE E If the problem is not solved by this head cleaning then cleaning will be performed d sometimes the initial ink charge may be able to recover the condition adj15 e Adjustment Adjustment by Adjustment Program 87 EPSON Stylus Photo 750 Revision A 5 3 7 Initial Ink Charge There is no ink charged in the ink path of a spare print head and printer mechanism Therefore after you replace any of the following units perform initial ink charge and return the printer after making sure th
10. the printed pattern This adjustment is to correct differences in printing positions which is caused by slippage of printing timing in right and left directions during 5 Select Adjust on the Bi D Adjustment Menu if there is any non the Bi directional printing The value adjusted in this section will be aligned lines stored as Bi D corrected value in the EEPROM on the control board 6 Refer to the pattern sample below and input the variable dot and 1 Select Adjustment on the main menu and press Return key normal dot Setting range 36 36 Program goes to the Adjustment menu 2 Select Bi Directional Adjustment and press Return key Following screen appears 2s Prompt SP750 Auto min a A Bi Direaticmal Adjustment Bite tie WD ad uutannt fitter Ad just Gheck present mdjustment data pz Mur NEL Nn NI RI Figure 5 6 Bi D Adjustment Pattern Sample adj13 7 Repeat Step 3 to 6 until Bi D pattern become correct 3 Select Print the Bi D Adjustment Pattern and press Return key twice 3 Bi D patterns of the current setting value and 2 levels are 8 To finish the adjustment press ESC key until the adjustment menu printed at variable dot and normal dot appears Adjustment Adjustment by Adjustment Program 86 EPSON Stylus Photo 750 Revision A 5 3 6 Head Cleaning In this function the same cleaning as the one from the control panel can be performed from the adjustment program With this sequence you z
11. PM 770C Stylus PHOTO 750 eNO BOWER eNtt BANEL cya HB SENSOR CNS PE SENSOR CNS ASF SENSOR CN7 Cn MOTOR gna BP MOTOR cna HEAD
12. See Housing Removal on page 54 6 Remove Paper Guide Front B releasing its hook 2 Remove Carriage Assembly See Carriage Assembly Removal on page 68 3 Remove PE Sensor Assembly PE Sensor Assembly Removal on page 70 4 Remove 2 screws securing Guide board Cable to the printer mechanism then remove Guide Board Cable PAPER GUIDE LEFT PAPER GUIDE ASSEMBLY UPPER SHAFT PAPER GUIDE UPPER TORSION SPRING 117 6 Figure 4 23 Roller Assembly Paper Exit Removal 7 Release the locks of right and left shaft supports for the Roller Assembly Paper Exit and remove the Roller Assembly Paper Exit 8 Unlock and release the left shaft support of Roller Assembly PF and match the cut out of the frame shaft and protrusion of the shaft Figure 4 22 Paper Guide Assembly Removal support Disassembly and Assembly Disassembly 71 EPSON Stylus Photo 750 Revision A 9 Move the whole Roller Assembly PF to the left direction and remove the Roller Assembly PF Put ROLLER ASSEMBLY PF through here CHECK B When reinstalling Paper Guide Assembly Upper POINT at the right edge be careful not to damage the PE Sensor Lever Be careful not to damage the hook when removing or installing Paper Guide Front B B Becareful not to damage the black coated part of Roller Assembly PF during disassembly and assembly B Becareful not to da
13. Width 127mm 5 0 x Length 203mm 8 0 10x8 Index Card Width 127mm 5 0 x Length 203 mm 8 0 W Thickness Less than 0 23mm 0 0091 General Description 6 EPSON Stylus Photo 750 Revision A 1 2 4 Printable Area O Cut Sheet Table 1 3 Printable Area The figure below shows printable area Left Bottom Paper Size Margin Margin min min A4 210mm 297mm 3mm 3mm is P 8 3 11 7 0 127 0 12 0 127 3mm 3mm 14mm 0 54 216mm 279mm 9mm Letter 0 12 0 12 3mm 8 5 11 0 0 35 0 12 216mm 356mm 3mm 9mm 3mm 14mm 0 54 Legal 3mm 8 5 14 07 0 12 0 35 0 127 0 127 Statement 1897mm 215 9mm 3mm 3mm 3mm Por 8 5 8 5 0 127 0 12 0 12 0 12 B5 182mm 275mm 3mm 3mm 3mm m 7 2 10 17 0 12 0 12 0 127 0 12 Executive 1842mm 266 7mm 3mm 3mm 3mm ILE 7 25 015 0 12 0 12 0 12 0 12 Photo 101 6mm 152 4mm 3mm 3mm 3mm bd Paper 4 6 0 12 0 127 0 127 0 12 PW Note Bottom margin can be set up to 3mm at minimum when the paper length is designated with ESC S command However there is the Figure 1 3 Printable Area possibility that a printing scrambles in the area ranging from 3mm to 14mm from the form lower end When the paper length is not designated the bottom margin must be wider than 14 mm Product Description General Descri
14. components Refer to the flowchart below and perform repairing the component after separating the defective units START Unit Level Troubleshooting Unit Repair Main board Unit Repair PSB PSE Unit Repair Printer Mechanism Disassemble and Adjustment Sensor Name Table 3 2 Sensor Check Point Check Point Signal Level Less than 0 7V Switch Mode Open Out of HP range HP Sensor CN4 Pin 1 and 2 More than 2 4V Close Within HP range Less than 0 7V Open Paper PE Sensor CN5 Pin 1 and 2 exists More than 2 4V Close No paper Open Paper Feed Less than 0 7V Roller home ASF Sensor CN6 Pin 1 and 2 position More than 2 4V Close Out of home position Thermistor Head side CN9 THM Pin 3 and 4 Analog signal 10K at 24 C Black cartridge Head side CN9 Open Cartridge is installed sensor COB Pin 1 and 4 Close No Cartridge Color cartridge Head side CN9 Pin 2 and 4 Open Cartridge is installed Close No Cartridge sensor COC END Figure 3 1 Troubleshooting Flowchart Table 3 1 Motor Coil Resistance Location Check Point Resistance Pin 1 and 3 7 8 Ohms 10 at CR Motor CN7 Pin 2 and 4 25 C one phase Pin 1 and 3 8 8 Ohms 10 PIP eion ONE Pin 2 and 4 at 25 C one phase Troubleshooting Overview 39 EPSON Stylus Photo 750 Revision A Table 3 3 Error Indication LED Indication
15. em pine SOO pA SS SK 7S a J f go necs Guranteed Range 20 H 4 ee77 ___ 10 C 27 C 35 C Temperature 50 F 80 F 95 F F Figure 1 6 Environmental Condition Product Description General Description 9 EPSON Stylus Photo 750 Revision A 1 2 7 Ink Cartridge 1 2 7 1 Black Ink Cartridge LI Ll LI Product Description Type Exclusive cartridge Color Black Print capacity 540 pages A4 ISO IEC1056 1 Letter Pattern at 360 dpi Ink life 2 years from production date Storage temperature 20 C to 40 C Storage within a month at 40 C 30 C to 40 C Packing storage within a month at 40 C 30 C to 60 C Transit within 120 hours at 60 C and within a month at 40 C Dimension 19 8mm W x 52 7 mm D x 38 5mm H Figure 1 7 Black Ink Cartridge 1 2 7 2 Color Ink Cartridge L1 LI Ll LI LI L1 Type Exclusive cartridge Color Magenta Cyan Yellow Light Magenta Light Cyan Print capacity 220 pages A4 360 dpi 5 duty each color Ink life 2 years from production date Storage temperature 20 C to 40 C Storage within a month at 40 C 30 C to 40 C Packing storage within a month at 40 C 30 C to 60 C Transit within 120 hours at 60 C and within a month at 40 C Dimension 51 4mm W x 52 7 mm D x 38 5mm H NOTE Ink cartridge can not be re filled only ink cartridge is prepared for article of consumption Do not use the ink cartridge which was passed away
16. v paper eal tci es in the ASF NO y connected correctly correctly NO Set the paper correctly v YES Connect the b control panel Do B5 correctly the PF roller and platen Y Y rotate YES Is the Is the PF motor problem running NO solved Remove any obstruction YES in the paper path if YES Check the PF motor NO there is any If there is no problem replace the main board Y Y Replace the control Clean the roller of panel paper path Y Is the problem Is the solved problem gt No v solved NO v YES Replace the YES Refer to Section 3 5 main board Repair of the printer mechanism Figure 3 5 Flowchart 4 Figure 3 6 Flowchart 5 Troubleshooting Unit Level Troubleshooting EPSON Stylus Photo 750 3 3 Unit Repair Power Supply Board Revision A This section describes the problems related to the power supply board The table below provides various symptoms likely causes and checkpoints The checkpoints refer to waveforms resistance and other values to check to evaluate the operation of each component Table 3 5 Repair of the Power Supply Board Table 3 6 Repair of the Power Supply Board pee Condition Cause Check point Solution alias Condition Cause Check point Solution Check F1 is normal or not by using Replace Check the output wave pin 8 F1 is open a multimeter F1 Trans T1
17. 2 1 Printing Table 1 1 Printing Speed PRINTING METHOD Character Pitch Printable columns LQ speed O On demand ink jet 10 CPI Pica 80 200CPS NOZZLE CONFIGURATION This value is the speed of one print pass in which the 1 3 of character matrix is printed O 48 nozzles x 6 Black Cyan Magenta Yellow Light Cyan Light Magenta O Raster graphics mode Table 1 2 Raster Graphics Mode mouzomal Printable area Available dot CR Speed resolution 180 dpi 8 26 inch 1488 20 IPS 360 dpi 8 26 inch 2976 20 IPS E S 720 dpi 8 26 inch 5952 20 IPS CONTROL CODE L ESC P Raster Ol EPSON Remote command Bk Cyan LC M LM Y sp02 Figure 1 2 Nozzle Configuration CHARACTER TABLES O 2 international character sets W PC437 US Standard Europe O Bi direction with logic seeking M PC850 Multilingual PRINTING DIRECTION Product Description General Description 5 EPSON Stylus Photo 750 Revision A TYPEFACE O Bin map LQ font EPSON Courier 10 CPI 1 2 2 Paper Feeding O Feeding Method Friction feed with ASF O Paper Path Cut sheet ASF Top entry O Feeding Speed 2 36 inches sec normal speed mode continuous feeding 4 5 inches sec high speed mode continuous feeding 1 2 3 Paper Specification This section describes the printable area and types of paper which can be used in this printer B No curled wrinkled scuffing or torn paper be used
18. 2 8 Common Drive Circuit Figure 2 7 EEPROM Control Circuit Operating Principles Operating Principles of Electric Circuit 35 Revision A EPSON Stylus Photo 750 O Driver on the head 2 2 2 7 Paper Feed Pump Motor PF Pump Motor Drive The driver on the head is Nozzle selector drive circuit Each drive Circuit Meu cold as a Mn e a IC12 and IC13 on the control circuit board drive PF PUMP motor This arge i amp bn i e 9Y TMS GIPGUIL WI dubai motor uses 4 phase 200 pole Hybrid type stepping motor and drives upset e este constant current bi pola Current Detection M6252 IC16 op09 Figure 2 9 Paper Feed Pump Motor Drive Circuit Operating Principles Operating Principles of Electric Circuit 36 EPSON Stylus Photo 750 Revision A 2 2 2 8 Carriage Motor CR Motor Drive Circuit CR motor is driven by IC11 mounted on the C259 main control board 4 phase 200 pole Hybrid type stepping motor is used as a CR Motor and is driven by bi pola constant drive control E05B58 IC2 LB1847 IC11 CRPHAA CRPHAB CRENBA CRENBB Figure 2 10 Carriage Motor Drive Circuit Operating Principles Operating Principles of Electric Circuit 37 EPSON Stylus Photo 750 Revision A 3 1 Overview This section describes how to identify and troubleshoot the problems when repairing the printer by dividing the troubles into two levels repair and replacement of the assemblies and units and repair of the
19. EPSON ERO Nipper EPSON B740500100 Danger of explosion if the battery is incorrectly ea PEON p replaced Replace only with the same or equivalent i type recommended by the manufacture Dispose of Thickness gage EPSON B776702201 used batteried according to government laws and regulations Disassembly and Assembly Overview 51 EPSON Stylus Photo 750 Revision A 4 1 3 Work Completion Check If any service is made to the printer use the checklist shown below to confirm that all works are completed properly and the printer is ready to Table 4 3 Check List Classifi return to the user cation tem Sheck Folnt Pu ifi Ll Checked Table 4 2 Check List paoman Are all the adjustment done Adjustment Adjustment correctly O Not necessary lesa Check Point Status cation Fi BESET Are all the lubrication made at the Checked ecke ifi i Self test Is the operation normal d v specified points Ll Not necessary O Not necessary Lubrication Lubrication RIGEGREEREG Is the amount of lubrication made H Checked ecke On line test Is the printing successful correctly O Not necessary Ll Not necessary E Checked Function ROM version Version Print head Is H d schauen normally from all E Checked O Not necessary nozzle Not necessar y Are the ink cartridge installed Ll Checked O Checked Ink Cartridge 2 Does it move smoothly ON correctly O Not necessary PINE
20. Point Table 6 4 Lubrication Point Lubrication Type Point Lubrication Point ASF The round hole in the right frame of ASF to hold the roller shaft Lubrication Type G 26 Lubrication Amount Evenly apply inside the hole Remarks Avoid applying grease to Roller Assembly LD Lubrication Point ASF Contact points between Hopper and Lever Hopper Release Lubrication Type G 26 Lubrication Amount Evenly apply lubrication to the points Completely wipe off any grease sticking out to the inner side of ASF Lubrication Point The round cutout in the left frame of ASF Gear 34 is inserted to the cutout lt Lubrication Type gt G 26 lt Lubrication Amount gt Evenly apply inside the hole Completely wipe off any grease sticking out to the inner side of ASF Lubrication Point Oil pad in the carriage assembly Lubrication Type O 12 lt Lubrication Amount 0 7cc Note This is the amount to be applied to a new oil pad Lubricate the oil pad only when Replacing the carriage assembly Replacing the oil pad Use a precise syringe to apply it If you accidentally apply too much oil to the oil pad throw the pad away and take a new one again Leave the oil pad for a while to wait until oil is evenly infiltrated then install it on the carriage assembly No Lubrication Type Point Remarks No lt Lub
21. Revision A 2 2 Operating Principles of Electric Circuit The electric circuit of this printer consists of the following circuits O C259 Main Control Circuit O C257 PSB Power Supply Circuit O C209 PNL Panel Board Also the head drive circuit is mounted on the print head In this section the operating principles of C257PSB board and C259 Main board The figure below shows the block diagram of the electric circuit Printer Mechanism C209PNL Control Panel CR Motor 3 i PF Pump Motor C259MAIN Printhead Control Board C257PSB Power Supply Board Sensors it Figure 2 2 Electric Circuit Block Diagram Operating Principles 2 2 1 C257 PSB Power Supply Circuit The power supply circuit in the printer uses RCC Ringing Choke Converter circuit method and generates and outputs 2 types of voltages which are necessary for the printer operation Table 2 1 Output Voltage Voltage Usage Motors See Print Head common voltage C259Main Control Circuit Logic 5VDC C209 PNL Panel Board Sensors In this printer even if the power switch is turned off in the middle of the printing operation application of the secondary switch enables the printer to supply the voltage to the power logic lines at the main board side for at least 30 seconds Therefore even if the switch is turned off in the middle of the printing operation the power will be turned off after the cappin
22. There are 3 types of initialization O Power on Initialization This printer initializes itself when it is turned on or when it recognizes the cold reset command remote RS command On this initialization following actions are performed B When you need to perform test print after the repair service performing the status printing see Control Panel on page 21 provides the discharged ink condition from the all ink nozzles and the current value of the waste ink counter Be sure to check m Initialize mechanical components that the counter value still has enough capacity if the value is closer to 2700 or not W Clear the input buffer m If there is no enough capacity exchange the waste W Clear the print buffer ink absorber and find out if it is necessary to reset W Set default values EEPROM or not If you need to reset EEPROM refer MEM to Special Setting Mode on page 22 O Operator initialization This printer initializes itself when it is turned off and is turned on O Maintenance request again within 10 seconds or when it recognizes the INIT When the total quantity of ink wasted with cleaning and flushing signal negative pulse on parallel interface On this initialization reaches the limit the printer indicates this error and stops printing following actions are performed The absorber in the printer enclosure should be replaced with a new m Cap the print head one by a service person The counter is added by points and its li
23. and DES values depend on the EEPROM setting Product Description Table 1 9 Connect pin assignment and signals Signal Name Return GND pin In Out Function Description 1 HostClk 19 In Host clock signal The DATA 0 through DATA7 signals represent data bits 0 7 respectively Eacj signal is at high level 2 9 Data0 7 20 27 In when data is logical 1 and low level when data is logical 0 These signals are used to transfer the 1284 extensibility request values to the printer 10 PtrClk 28 Out Printer clock signal 11 PtrBusy 29 Out Printer busy signal and reverse channel DataBit 3 7 transfer data bit3 or 7 12 AckDataReq 28 Out Acknowledge data request signal and DataBit 2 6 reverse channel transfer data bit2 or 6 Xflag X flag signal and reverse channel 3 DataBit 0 4 EB Cui transfer data bit 1 or 5 14 HostBusy 30 In Host busy signal 31 INIT 30 In Not used 32 DataAvail 29 Out Data available signal and reverse DataBit 0 4 channel transfer data bit O or 4 36 1284 Active 30 In 1284 active signal 18 Logic H Out Pulled up to 5V via 3 9K ohm resistor 35 5V Out Pulled up to 5V via 3 3 K ohm resistor Chassis 17 GND Chassis GND 16 33 Y GND Signal GND 19 30 15 34 NC Not connected Parallel Interface 16 EPSON Stylus Photo 750 Revision A NOTE Following lists Notes when using the parallel interface 1 Return G
24. by receiving a magic string 1284 4 synchronous commands Until a magic string is received other commdands are discarded Off Communication is carried out in the conventional mode A magnetic string 1284 4 synchronous commands is discarded Auto Communication is carried out in the conventional mode until a magic string 1284 4 synchronous commands is received By receiving a magic string communication in IEEE1284 4 packet mode is started NOTE The packet protocol of IEEE 1284 4 allows a device to carry on multiple exchanges or conversations which contain data and or control information with another device at the same time across a single point to point link The protocol is not however a device control language It does provide basic transport level flow control and multiplexing services The multiplexed logical channels are independent of each other and blocking of one has no effect on the others The protocol operate over IEEE 1284 Parallel Interface 20 EPSON Stylus Photo 750 Revision A 1 4 Function 1 4 3 1 Switches Since this printer does not have so many switches each button has 1 4 4 Control Code several functions The tables below show their functions and how to m enter those functions for each switch This printer is operated with the raster graphics control code based on the ESC P2 control line Refer to ESC PV2 Reference Manual and Table 1 15 Panel functions in normal state ESC P2 specification for each c
25. housing See Housing Removal on page 54 2 Remove Absorber Tray Assembly A See Absorber Tray Assembly A Removal on page 58 3 Remove the following gears which are located at the left side of the printer mechanism W Gear 67 2 B Combination gear 8 8 21 6 W Combination gear 8 14 4 W Gear 36 Motor Assembly PF 4S Hexagonal Nut 7 j g x E ear 67 2 FX Combination Gear 8 14 4 amp N amp Combination Gear 8 8 21 6 4 R Gear 36 e Lock Ring Figure 4 14 Motor Assembly PF Removal Disassembly and Assembly Disassembly Revision A 4 Remove the hexagon nut and Motor Assembly PF CHECK B When removing the Motor Assembly PF first POINT slightly pull out the Motor Assembly PF from the frame and slide the motor shaft to a larger cut out of the frame and remove it B Be careful for the routing direction of the cable from the Motor Assembly PF Motor Assembly PF behind the frame Cable Direction Put the motor shaft once in a larger hold then slide it to a smaller hole Figure 4 15 Motor Assembly PF Installation 64 EPSON Stylus Photo 750 Revision A 4 2 5 5 ASF Assembly Removal 1 Remove the upper housing See Housing Removal on page 54 2 Release the hook and remove Gear 34 from the roller shaft of ASF Assembly 3 Remove the cable from a hook of ASF Assem
26. is Check T1 is normal or not by using Replace open a multimeter T1 The Check the drain wave printer does not ideis a PASG Replace operate at a de b S IC51 BARE all not work roken LI FET Q1 is EBEN Replace broken ara Q1 WANN The vai ii wave03 printer 42VDC VI VIV does not line does Froben e operate at not work all Q2 or Q3 is REpESG broken Cea Q3 wave02 PC1 is Replace broken PC1 Troubleshooting Unit Repair Power Supply Board 44 EPSON Stylus Photo 750 Revision A 3 4 Repair of the Control Board This section describes the problems related to the power supply board The table below provides various symptoms likely causes and checkpoints The checkpoints refer to waveforms resistance and other values to check to evaluate the operation of each component Table 3 7 Repair of the Control Board Table 3 8 Repair of the Control Board Check 5VDC line Pin 7 of IC8 and reset signal Pin 2 of IC8 Reset AE Replace circuit is IC8 broken i Th Aus hi ae Check that the waveform of Pin11 Replace deat diede of IC3 reverses High Low Ti p CPU does y does not notwark operate at RAMis Replace all broken Q1 Check the signal waveform Pin 88 of IC1 CPU is broken Troubleshooting Repair of the Control Board 45 EPSON Stylus Photo 750 Revision A Table 3 9 Repair of the Control Board MS Condition Cause Check point Solution Ch
27. procedures are described under the heading Caution Any adjustment required after disassembling the units are described under the heading Required Adjustment Also read precautions below before starting 4 1 1 Precautions A lithium battery is installed on the main board of this printer for backing up the system clock Mishandling the battery may cause explosion or short Read carefully the following precautions meom Disconnect the power cable before disassembling or assembling f W A lithium battery is installed on the main board of this printer Be sure to observe the following instructions when servicing the battery Risque d explosion si la pile est remplac e incorrectment Ne remplacer que par une pile du m me type ou d un type quivalent recommand par le fabricant Eliminer les piles d charg es selon les lois et les r gles de s curit en vigueur B Since the fan inside of the printer interior does not have a cover do not touch it when it is running B Handle with care for the electric parts inside of the printer since electrostatic may damage the elements 4 1 2 Tools Use only specified tools to avoid damaging the printer Table 4 1 Tools Supplier Parts No Phillips S Dri 1 Do not get the battery shorted No 1 Mie EPSON B743800200 2 Do not install the battery in the wrong direction Mi Sen oA 3 Do not heat the battery or put it near the fire No 2
28. the print Pump fy head and print surface from contacting and rubbing E O Paper Feed Mechanism This mechanism consists of Paper Feed Motor PF Motor PF Paper Feed Roller Paper Feed Roller Line and Paper Guides Mechanism o O Hopper Drive Mechanism This mechanism is installed at the rear side of the printer and consists of Paper Pick Up Roller One way Clutch and Hopper Hopper Drive opi N Mechanism P A Operation is performed by the PF motor when the carriage is around the left edge Paper is set to the hopper One way clutch rotates the Pick Up roller for paper loading by using the driving power of the PF motor Pump Mechanism Figure 2 1 Printer Mechanism Operating Principles Overview 28 EPSON Stylus Photo 750 Revision A O Pump Mechanism This mechanism consists of Pump and Cap parts W Cap Parts This protects the surface of print head nozzle from being dry or from being attached with dust B Pump Parts This part receives motive power from the PF motor and absorbes bubbles and viscous ink on the print head nozzle by using the motor rotation and drains them to the waste ink pad O Carriage Lock Mechanism This prevents the print head from separating from the cap parts by the shocks from outside Using the motive power from the PF motor this mechanism controls the lock lever which secures the carriage and fixes or releases the carriage Operating Principles Overview 29 EPSON Stylus Photo 750
29. 5 5V Out Pulled up to 5V via 3 3 K ohm resistor Table 1 8 Connector pin assignment and signals Chassis u GND Chassis GND Item Specification ae GND rn Signal GND Transmission mode IEEE 1284 nibble mode li Synchronization Refer to the IEEE 1284 specification Tod NG Ed se Not connected Handshaking Refer to the IEEE 1284 specification NOTE In Out refers to the direction of signal flow from the printer s Data trans timing Rear o ie Sis Steeles til point of view Signal Level TTL compatible level Adaptable connector 57 30360 amphenol or equivalent O Extensibility request The printer responds affirmatively when the extensibility request values are OOH or 04H that mean 00H Request Nibble Mode Reverse Channel Transfer 04H Request Device ID Return Data Using Nibble Mode Rev Channel Transfer O Device ID The printer sends following device ID string when it is requested m When IEEE1284 4 protocol is effective 00H 57H MFG EPSON CMD ESCPL2 BDC D4 MDL Stylus SP Photo SP 750 CLS PRINTER DES EPSON SP Stylus SP Photo SP 750 Product Description Parallel Interface 15 EPSON Stylus Photo 750 Revision A m When IEEE1284 4 protocol is NOT effective OOH 57H MFG EPSON CMD ESCPL2 BDC MDL Stylus SP Photo SP 750 CLS PRINTER DES EPSON SP Stylus SP Photo SP 750 NOTE OOH denotes a hexadecimal value of zero SP denotes a space character 20H MDL
30. Drop Limitation Circuit 2081 86 ZD51 Limitation Circuit This protection circuit is in the same line as 42V over voltage ZADE Line protection circuit is located The output voltage level of the 42V line C84 Q84 is monitored by a Zener diode This circuit shuts down the circuit E operation forcefully when the voltage levels drops 36V Delay Circuit 9 O 42VDC Line Over Voltage Circuit Ircul This circuit is in the same line as 5V line over voltage protection dm circuit is installed The output level is monitored by two Zener diodes If the voltage level exceeds 48VDC this circuit stops circuit TRANS T1 operation forcefully Q2 Q3 Q31 O 5V Line Constant Voltage Constant Current Control Circuit Smoothing Main Switching The output current is monitored by a 5VDC generation switching a iu Sara control IC IC51 which also monitors the output voltage This information is input to the internal comparator and stabilizes 5V line Over Current Filter Circiut Full Wave mu Protection Rectifier circuit op03 Figure 2 3 Power Supply Circuit Block Diagram Operating Principles Operating Principles of Electric Circuit 31 Revision A EPSON Stylus Photo 750 2 2 2 C259 Main Control Circuit Printer mechanism is controlled by C259 main board The figure below shows the block diagram of C259 main control circuit CN3 USB CN9 HD FFC Batt CR1 Cartridge Sensor Q2 amp Q3 Exil L ILLI CN1 Parallel Tim
31. EEPROM See Special Setting Mode on page 22 8 in the table above means no change Product Description Function Revision A 1 4 6 Errors In this printer when the following conditions are detected the printer goes to the error condition sets ERROR signal Low and BUSY signal High and stops receiving the data The printer becomes unable to print at this time However if the printer communicated by IEEE1284 4 protocol the printer does not become unprintable state Ink Out When the printer runs out most of the ink of any one color it indicates ink low warning and keeps printing When the print runs out the whole ink of any one color it indicates ink error and stops printing Exchanging ink cartridges is required on this state An ink cartridge taken out once should not be used again Re installation of the cartridge upsets the ink level detection and may cause a serious problem to the print head as a result Never use or re install the cartridge which is taken out once Re installation of the used cartridge disturbs the normal ink out detection Paper out When the printer fails to load a sheet it becomes paper out error condition Paper Jam When the printer fails to eject a sheet it becomes paper jam error condition 23 EPSON Stylus Photo 750 Revision A O No Ink Cartridge 1 4 7 Initialization When the printer detects that ink cartridge comes off it becomes TP No ink cartridge error condition
32. EMI O 220 240V version W Safety standard UL1950 with D3 CSA22 2 No 950 with D3 FCC part 15 subpart B classB CSA C108 8 class B EN60950 VDE NEMKO EN55022 CISPR Pub 22 class B AS NZS 3548 class B 1 2 12 Acoustic noise O Level General Description Approx 47 dB A According to ISO 7779 11 EPSON Stylus Photo 750 Revision A 1 2 13 CE Marking O 220 240 V version M Low Voltage Directive 73 23 EEC EN60950 B EMC Directive 89 336 EEC EN55022 Class B EN61000 3 2 EN61000 3 3 EN50082 1 IEC801 2 IEC801 3 IEC801 4 1 2 14 Printer Language and Emulation O Printer Language ESC P Raster EPSON Remote 1 2 14 1 ESC P Control Codes lt Character mode gt O General operation E Initialize printer L Paper feeding W Form Feed W Line Feed W Carriage Return Product Description ESC FF LF CR lt Graphic Mode gt m General operation m Initialize Printer W Unidentical Printing W Print a Image m CSF Mode Control Paper Feeding W Form Feed W Line Feed W Line Spacing W Carriage Return Page format W Page Length W Top Bottom Margin W Paper Size Print position motion m Horizontal Print Position ESC ESC ESC ESC ESC ESC U ESC ACK ESC EM FF LF ESC CR ESC C ESC c ESC S Em Vertical Print Position ESC V ESC v Spacing W Graphics Mode Graphics W Raster Graphics B Microweave control General Description ESC G
33. ESI Packing CUT Have all relevant protective Ll Checked Is there any abnormal noise in its L Checked thera materials been attached to the O Not necessary Carriage operation Ll Not necessary printer Main eria Is there any dirt or foreign objects Ll Checked Binet Attachment Have all relevant items been Ll Checked Unit on the CR guide shaft O Not necessary Accessories included in the package O Not necessary Is the CR motor at the correct L Checked temperature Not too hot O Not necessary Is paper advanced smoothly Ll Checked No paper jamming O Not necessary No paper skew Nomultiple feeding Paper Feeding No abnormal noise Mechanism Is the PF Motor at correct LI Checked temperature O Not necessary Is the paper path free of all Ll Checked obstructions O Not necessary Disassembly and Assembly Overview 52 EPSON Stylus Photo 750 Revision A 4 2 Disassembly The flowchart below shows step by step disassembly procedures START Housing Removal Board Assembly Printer Mechanism Cartridge Sensor Removal Removal Removal Y Print Head Removal Control Panel Removal Absorber Tray Assembly A Removal LL Pump Assembly Cap Assembly Removal Motor Assembly CR Removal Motor Assembly PF Removal ASF Assembly Paper Feed Roller Roller Assembly Removal Assembly Removal LD R L Removal C
34. ND pin in the table means twist pair return and is connected to the signal GND level Also these cables are shielded wires and it is effective means to connect to each chassis GND in the PC and printer for electrostatic noise Product Description Parallel Interface 17 EPSON Stylus Photo 750 1 3 3 Serial Interface This section shows specification for serial interface I F Table 1 11 Serial interface Item Standard Specification Based on RS 423 Revision A Following figure shows port arrangement of serial I F connector Synchronization Synchronous Bit rate Approx 1 8Mbps Word format Start bit 1bit Data bit 8bit Parity bit none stop bit 1bit Handshaking X ON X OFF DTR protocol Adaptable connector 8 pin mini circular connector Recommended interface cable Apple System Peripheral 8 cable Pin Table 1 12 Connector pin assignment and signals Signal Figure 1 10 Serial I F Connector Port Following table shows timing relation of DTR X ON X OFF No Name In Out Function Description handshaking Po en ont na ae Table 1 13 X ON X OFF DTR protocol a cs n ERO seta State Buffer space X on X off DTR 3 TxD Out Transmitt data Less than 3072 B Send X OFF cod Off 4 S G In Signal ground nd bytes gn coo 5 RxD In Receive data Ready aee Send X ON code On 6 TxD Out Balanced Transmit 7 DTR Out Data t
35. Ori soos eio o Io Se RARE e Re PR Re Ri ERE De cba 92 Appendix Connector Sumilary ipe ro e e rt e ree eret t i Eoi etant 97 Major Component Unit sssssssssssesseneeeennnnen nennen 97 Component EayOUL 3 itinere een Gites cb A e a Pa e anaes 100 Exploded DIagram uie ert niet eu rune ro ARENSE 102 Electric Circuit eame cate reda Red dE t Re Rte dad 105 EPSON Stylus Photo 750 Revision A 1 1 Overview This printer has better mechanism for the print quality and paper feeding than that of Stylus Photo and Stylus Photo 700 It also uses new print head and improved printing speed and through put 1 1 1 General Characteristics Major features of this printer are as follows O High quality color printing BW Bi directional printing at the resolution of 720 dpi M 1440 H x 720 V dpi printing W Photo MACH technology 6 color printing CMYKcm W Super micro dot Super micro weave printing O Built in auto sheet feeder W Holds 100 cut sheet b5g m B Holds 10 envelopes W Holds 10 transparency films Figure 1 1 Exterior View of Stylus Photo 750 W Holds 65 sheets of special paper O Built in 3 l Fs W Bi directional parallel I F IEEE 1284 level 1 device M Mac serial l F up to approx 1 8Mbps B USB I F O Windows Macintosh exclusive Product Description Overview 4 EPSON Stylus Photo 750 Revision A 1 2 General Description PRINTING SPEED AND PRINTABLE COLUMNS m O Character mode 1
36. a output 1 13 GND Ground 14 CLK Out Clock pulse for head data transfer Appendix Connector Summary 98 EPSON Stylus Photo 750 Revision A Table 7 8 Connector CN9 Table 7 9 Connector CN10 Pin Signal Name y o Function Pin Signal Name yo Function 15 GND Ground 1 42V Mechanism Drive Power Supply 16 NCHG Out All Head On Pulse Output 2 42V Mechanism Drive Power Supply 17 GND Ground 3 GND ats Ground 18 VDD Logic power supply 5V 4 GND Ground 19 GND2 Ground 5 PSC Out Sa Supply Switch Output 20 GND2 Ground 21 GND2 Ground SH EENE 22 GND2 Ground pid SP eon 23 COM Head Drive Power Supply i ior is ESO KARESE 24 COM Head Drive Power Supply Table 7 10 Connector CN11 25 COM zs Head Drive Power Supply Pin Signal Name 1 0 Function 26 COM Head Drive Power Supply 1 SW In Panel Switch on off 2 27 VHV Head Drive Voltage Control Signal 2 SWO In Panel Switch on off 0 3 PSC In Power on off switch 4 Swi In Panel switch input 1 5 LED3 Out LED drive signal 3 6 5V Logic power supply 7 5V zas Logic power supply 8 LED2 Out LED drive signal 2 9 GND Ground 10 LED1 Out LED drive signal 1 11 GND Ground 12 LEO Out LED drive signal 0 Appendix Connector Summary 99 EPSON Stylus Photo 750 7 2 Component Lay
37. aa ER 11 Unit Repair Power Supply Board eee 44 AGOUSIICISB Harranin r e edendi cumst Ertra acce Rene apo 11 Repair of the Control Board eene tnnt tntantnna 45 CE Eu ERR 12 Unit Repair Printer Mechanism ccceceeeeeeeeeeeeeeenneaeceeeeeeeeeeeeeeeeeea 47 Printer Language and Emulation ssssssssseeseess 12 Parallel Interface ottiene teen e ELI ien Pu a DE RER deed 14 Disassembly and Assembly Parallel Interface Forward channel sese 14 Parallel Interface Reverse channel PRETI PL CS 15 CVervieW sido n mA Ll edt e REP ee E i he la els Mess 51 Serial Interface eee ees sess sess ddl 18 Precautl ris iste te ds e tee etd tv ha dee ti i e e aa s aded 51 USB Universal Serial Bus MAIES 2 6 ERREUR 19 Hiec EPI a aa a a A a A S 51 Prevention of data transfer time out on the host ccce 20 Work Completion Check etae do dtes 52 Interface selection teeth nieder 20 Disassembly etti titii nete ie tria e 53 IEEE 1284 4 protOCol ero ne itineri ie e HE E P x Re Rte 20 Housing Rernov l nete me eee dete ere tette 54 E UTIGt OD arm ET ch canted Stuns es oa ca e e ELA D t buns EE ruta 21 Circuit Boards Removal 2 sides ttes desea Uu ncn iae lu i e SG 55 COMMON RN Nh a Aa TILE Ok Pu ROE 21 Control Panel Removal usi atis ice ct istuirt ieiuna b coorta 57 Bi directional Gormarid ceeiecd onsite teo d bu
38. arriage Assembly I Removal Roller Assembly PF Removal l Sensor Assembly PE Removal gt Sensor HP Removal Figure 4 1 Flowchart Disassembly and Assembly Disassembly 53 EPSON Stylus Photo 750 Revision A 4 2 1 Housing Removal Since this printer has no lower housing the printer mechanism is exposed just by removing the upper housing 1 Open the printer cover and set the PG adjust lever on the right hand side to position 2 Remove 4 screws and remove the upper housing e 29 9 Pull the front edge of the upper housing while ZOU lifting up the upper housing to remove it Be careful not to pinch the cable with the posts of the upper housing when reinstalling it Figure 4 2 Housing Removal Disassembly and Assembly Disassembly 54 EPSON Stylus Photo 750 4 2 2 Circuit Boards Removal Refer to Check Point and Adjustment Required on the next page 1 Remove the upper housing Housing Removal on page 54 2 Remove 5 screws securing the Printer Mechanism to the Shield plate M B Cable Holders SHIELD PLATE M B Figure 4 3 Shield Plate M B Removal 3 Slightly pull out the Shield Plate M B and remove the cable holder installed on the Shield Plate M B 4 Disconnect all the cables from the conn
39. at aE ee M Quinn gu CA ink is ejected correctly from the print head Perform initial ink charge at a Ho the following cases A Be careful of ES JE i j Hote thet 1 101BR 570 of nonweesd ink is consumed by ona tima W After replacing the printer mechanism i W After replacing or removing the print head Par tor ming the init jal ini m ga 1 Select Maintenance on the main menu and press Return key The v MEM M eee aT quantity of oolor ink absorption screen goes to the Maintenance Menu 2 Select Initial Charge Flag Reset and press Return key Then the screen goes to the Initial Ink Charge Check Menu Eec Previous Up Doen arrowe Salect Enter K adj18 3 If you wish to perform the initial ink charge press Return key If not press ESC key meee diio Gy lus Phet THI SERVICE PROGRAM Vorsion 1 0 em m W Initial ink charge is performed when the printer which is left at least 10 seconds after turning the power Off is turned back On again W Since this operation consumes large amount of ink Indication OF The Gounter Walue For The Waste Ink Pad do not perform unnecessarily g Maintenance X Haad Clann ing Tremapertation Liquid Gharge It takes about 2 minutes to complete the initial ink charge Esc Previces lip Dow arrows Select Enter 0K adj17 Adjustment Adjustment by Adjustment Program 88 EPSON Stylus Photo 750 Revision A 5 3 8 Counter Value for Ink Absorber This fu
40. bly Engaging parts at the carriage side ooks Figure 4 29 Sensor I C Removal 5 Separate Sensor IC from the harness by releasing its connection B Be careful of the direction of sensor when installing it Switch part should face to the front side B When installing Holder Sensor I C to the Carriage Assembly do not pinch the harness with carriage and holder CHECK POINT Disassembly and Assembly Disassembly 75 EPSON Stylus Photo 750 Revision A 5 1 Overview Note O Required Adjustment NA Not applicable This section describes the procedure for adjustments required when the printer is disassembled and assembled for repair 5 1 1 Required Adjustment Table 5 1 lists all the necessary adjustments for this printer If any service listed in this table is carried out all adjustments corresponding to that service should be performed to ensure proper operation of the printer Table 5 1 Required Adjustment Performance Priority i 5 3 Head Paper Gap Bi D Service Replacing parts Angular Adjustme nt Adjustme In Charge VH Setting nt Adjustme nt Replacing the printer NA O O NA O mechanism Replacing the C209 Main Board NA o o o Replacing the print head unit NA g 9 Q NA Replacing the CR Motor NA NA NA NA O Replacing or disassembling the carriage assembly Replacing or disassembling the O NA NA NA NA Ro
41. bly and cable hook of the Printer Mechanism 4 Remove a Shaft Fixing CR and one screw securing ASF Assembly to the printer mechanism frame 5 Remove the ASF Assembly from the mechanism by detaching the projection at the left of ASF Assembly from the hole of the mechanism CHECK B When assembling ASF Assembly make sure that POINT ASF Assembly is firmly attached to the mechanism B Use the fixing screws at the specified positions below Printer Left side Shaft Fixing CR CR motor side CBS Screw with washer Figure 4 16 ASF Assembly Removal When installing the ASF Assembly be sure that no cables are pinched between ASF Assembly and frame Especially if the cables from the motor is pinched there is a danger of short circuit and possibly causes hazardous problem such as over heating or burning of components Disassembly and Assembly Disassembly 65 EPSON Stylus Photo 750 4 2 5 6 Paper Feed Roller Assembly Rem