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!

  carmelo carmelo 2020-06-27 19:33:16  
  Thanks a lot all works. You saved my money. Didnt believe that it will be so easy to solve the problem. one more time thanks a lot
  andre luiz lobo 2008-07-21 01:36:16  
  muito bom preciso do rezeter da epson so assim posso resouver meu problema
  Angelique Hahn 2015-09-25 22:32:04  
  oh all good now john! it was my first time using this and i’m very impressed! super happy with the result and how fast i could use my printer, yay! thanks again!
  John Safranek 2010-03-29 19:19:29  
  Does NOT contain ANY instructions for replacing the waste ink pad cartridges!!!
  svenn svenson 2012-03-05 19:14:52  
  THIS IS A MUST HAVE UTILITY This reset key worked perfectly for my Epson Artisan 800. I tried the Epson reset utility (free from Epson) many times. It would "reset" the counter to "40%", then upon turning printer off - on, it would revert to "0%" with the error message that the inkpads had reached their end of life. This also happened whenever I performed a head cleaning. For those of us who use a CIS (I am not affiliated with inkproducts.com - but have been using their CIS for a couple of years and LOVE the quality and service) - it is imperative to be able to reset this waste ink counter. I should also add, the waste ink pad issue is real - don't expect to simply reset the waste ink counter and go happily on your printing way - you will have a disaster and you will experience frequent head clogging. You MUST use an external waste ink disposal system - either make your own for $5 or buy one. THIS + the reset utility is what enables you to get the true value from your CIS-modified printer.
  Ramiz Huseynov 2010-11-29 16:59:15  
  TX650 is working again
  Marcio D Santos 2023-01-11 17:46:06  
  Whenever I try to do the ink charge, ink out appears here, so far it hasn't worked for me, could support staff be able to help?

REPLY: To use Ink Charge - ink levels must be more then 50%
  Paul Robinson 2010-10-21 01:01:22  
  Fantastic, does exactly as it says, brought my r285 back from the dead, will recommend to anyone.thanks
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