Stylus Photo 780, 790 Printers
Service Manual

$9.99
Stylus Photo 780, 790 Printers<br> Service Manual
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This manual describes basic functions, theory of electrical and mechanical operations, maintenance and repair procedures of the printer. The instructions and procedures included herein are intended for the experienced repair technicians, and attention should be given to the precautions on the preceding page

This manual consists of six chapters and Appendix

CHAPTER 1. PRODUCT DESCRIPTIONS
Provides a general overview and specifications of the product

CHAPTER 2. OPERATING PRINCIPLES
Describes the theory of electrical and mechanical operations of the product

CHAPTER 3. TROUBLESHOOTING
Describes the step-by-step procedures for the troubleshooting

CHAPTER 4. DISASSEMBLY / ASSEMBLY
Describes the step-by-step procedures for disassembling and assembling the product

CHAPTER 5. ADJUSTMENT
Provides Epson-approved methods for adjustment

CHAPTER 6. MAINTENANCE
Provides preventive maintenance procedures and the lists of Epson-approved lubricants and adhesives
required for servicing the product

APPENDIX
Provides the following additional information for reference:
• Connector pin assignments
• Electric circuit boards components layout
• Electrical circuit boards schematics
• Exploded diagram & Parts List

CONTENTS

Chapter 1 PRODUCT DESCRIPTION
1.1 FEATURES
1.2 SPECIFICATIONS
1.2.1 Physical Specification
1.2.2 Printing Specification
1.2.3 Paper Feeding
1.2.4 Input Data Buffer
1.2.5 Electric Specification
1.2.6 Environmental Condition
1.2.7 Reliability
1.2.8 Safety Approvals
1.2.9 Acoustic Noise
1.2.10 CE Marking
1.3 INTERFACE 9
1.3.1 Parallel Interface (Forward Channel)
1.3.2 Parallel Interface (Reserve Channel)
1.3.3 USB Interface
1.3.4 Prevention of Data Transfer Time-out
1.3.5 Interface Selection
1.3.6 IEEE1284.4 Protocol
1.4 OPERATOR CONTROLS
1.4.1 Operating Switch
1.4.2 Control Panel
1.4.2.1 Switches
1.4.2.2 Indicators
1.4.3 Panel Functions
1.4.4 Printer Condition and Panel Status
1.4.5 Printer Initialization
1.4.6 Errors
1.4.7 Default Settings Selection Function
1.4.8 Printing of filled patterns
1.5 PAPER
1.5.1 Paper Handling
1.5.2 Paper Specification
1.5.2.1 Cut Sheet
1.5.2.2 Transparency, Glossy Paper
1.5.2.3 Envelope
1.5.2.4 Index Card
1.5.3 Printing Area
1.5.3.1 Cut Sheet
1.5.3.2 Envelopes
1.6 INK CARTRIDGE
1.6.1 Black Ink Cartridge
1.6.2 Color Ink Cartridge
1.7 Changing the Model Name

Chapter 2 Operating Principles
2.1 Overview
2.1.1 Printer Mechanism
2.1.2 Printhead
2.1.2.1 Printing Process
2.1.2.2 Printing Method
2.1.3 Carriage Mechanism
2.1.4 Paper Feeding Mechanism
2.1.5 Paper Loading Mechanism (ASF Unit)
2.1.6 Ink System Mechanism
2.1.6.1 Pump Unit & Wiper mechanism
2.1.6.2 Capping Mechanism
2.2 Electrical Circuit Operating Principles
2.2.1 C383 PSB board
2.2.2 C383 MAIN Board
2.2.2.1 Main elements
2.2.2.2 C383MAIN-B, C383MAIN-C
2.2.2.3 Printhead Driver Circuit
2.2.2.4 PF Motor (PF/ PUMP/ ASF Motor) Driver Circuit
2.2.2.5 CR Motor Driver Circuit
2.2.2.6 Reset Circuit
2.2.2.7 EEPROM Control Circuit
2.2.2.8 Sensor Circuit

Chapter 3 Troubleshooting
3.1 Overview
3.2 Troubleshooting with LED Error Indications

Chapter 4 Disassembly and Assembly
4.1 Overview
4.1.1 Precautions
4.1.2 Tools
4.1.3 Work Completion Check
4.2 Disassembly
4.2.1 Housing removal
4.2.2 Operation Panel removal
4.2.3 Printhead removal
4.2.4 CR motor removal
4.2.5 Waste drain ink pad unit removal
4.2.6 Circuit board removal
4.2.7 LD Roller removal
4.2.8 HP/PE Sensor removal
4.2.9 Ink system unit removal (Cap & Pump unit )
4.2.10 Paper Eject Roller removal
4.2.11 PF motor removal
4.2.12 CR unit removal
4.2.13 Paper feed roller removal
4.2.14 Disassembling ASF frame unit

Chapter 5 Adjustment
5.1 Outline
5.1.1 Adjustment items
5.1.2 Parallel adjustor
5.1.3 Adjustment with the service program
5.1.4 Installing the service program .9
5.1.5 Starting up the service program 9
5.2 Sequential service program by repair
5.2.1 Functions
5.2.2 Adjustment items
5.2.3 Nozzle check
5.2.4 Bi-D adjustment
5.2.5 Head ID input
5.2.6 Ink replenishment
5.2.7 USB ID
5.2.8 Protection counter clear
5.3 Independent adjustment service program
5.3.1 Functions
5.3.2 Head ID
5.3.3 Bi-D
5.3.4 USB ID
5.3.5 Head cleaning
5.3.6 Ink replenishment
5.3.7 Refurbishment for DOA
5.3.8 Protection counter
5.3.9 Printing on normal A4 paper
5.3.10 CSIC information
5.3.11 EEPROM data

Chapter 6 Maintenance
6.1 Overview
6.1.1 Cleaning
6.1.2 Service Maintenance
6.1.3 Lubrication

Chapter 7 Appendix
7.1 Connector Summary
7.1.1 Major Component Unit
7.1.2 EEPROM Address Map
7.2 Component Layout
7.3 Exploded Diagram
7.4 Parts List
7.5 Electrical Circuits


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We are in business since 2002 and do our best to give our customers perfect service!

  Robin Griffiths 2012-11-22 08:48:30  
  BRILLIANT My Epson T11 stopped working with the ominous 2 lights flashing so I knew it was trouble and yes teh dreaded message came up about internal parts reaching the end of their servicabel life take it to (an expensive) service. Oh dear - A Google search brought up all sorts of so called download links for free re-set software but all of them didn't download the software but kept taking me to weird web sites. I was in despair of finding somethign that worked then came across 2manuals.com. I thought at first oh dear theres a cost involved. However I though well if it does work it will be worth it. Downloaded the software, plus updates, ordered the re-set key and hey presto a few seconds later the printer was up and going again. It was was every penny of the cost. Dont waste time trying to find so-called free solutions - total waste of time and so frustrating. Pay out for this and save the time and frustration AND it works! No fuss, no messign about no time wasting getting to dubious web site. A big THANK YOU I can highlym unreservedly reccomend this compnay for sorted out knotty printer problems
  ra rr 2013-01-17 23:55:00  
  Just bought a key to reset my Epson printer and it worked. Thank you!
  comunicate ya 2013-02-22 18:31:11  
  CLAVE PARA REINICIAR MI CONTADOR DE IMPRESORA EPSON WORKFORCE 315
  Wesley Pritchard 2004-02-07 21:55:21  
  The only way to really adjust you printer is by using this program. The owner the printer could not adjust the print using the regular adjustmest utility incleuded in the printer drivers. But this program did the trick. The printer is perfectly adjusted and the owner is very happy with the printer now.
  dave hardik yogeshbhai 2006-12-03 22:47:49  
  Just wanted to THANK YOU for letting me download that manual. I REALLY appreciate it. You know how kids are when they get on a computer they think they know everything and don\'t know anything. So Thanks Again AL HART
  Eva Baumgartner 2025-06-02 15:36:12  
  GroĂźartig! - mit trial versucht, heute gekauft, bezahlt, bekommen, angewendet - und mein Epson XP-950 läuft (mit neuem Tintenkissen) wie neu. Toller Service, ich bin sehr zufrieden.
  Jack Wilson 2007-04-21 23:00:22  
  JUST A NOTE TO THANKYOU FOR A BRILLIANT WEBSITE SERVICE Had an Epson R220, locked Within three minutes of buying the adjustment software for R220, printer was rejuvenated and lept into life doin handstands!!! Excellent-well done!!! SRS
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