This Stylus Photo 785, 825, 895, 915, PM790PT 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 theproduct
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
CHAPTER 7.APPENDIX
Provides the following additional information for reference:
� Connector pin assignments
� Electric circuit boards components layout
� Electrical circuit boards schematics
� Exploded diagram & Parts List
PRODUCT DESCRIPTION
FEATURES
SPECIFICATIONS
Physical Specification
Printing Specification
Paper Feeding
Paper Specification
Plain Paper
Envelope
Exclusive paper
Printing Area
Cut Sheet
Envelopes
Ink Cartridge Specification
Black Ink Cartridge
Color Ink Cartridge
Electric Specification
Environmental Condition
Reliability
Safety Approvals
Acoustic Noise
CE Marking
INTERFACE
Parallel Interface (Forward Channel)
Parallel Interface (Reserve Channel)
USB Interface
Prevention Hosts of Data Transfer Time-out
Interface Selection
IEEE1284.4 Protocol
PANEL CONTROL
Indicators (LEDs)
Panel Functions
Printer Condition and Panel Status
Error Status
Printer Initialization
Operating Principles
Overview
Printer Mechanism
Printhead
Printing Process
Printing Method
Carriage Mechanism
Paper Loading/Feeding Mechanism
Paper Loading Mechanism (ASF unit)
Paper Feeding Mechanism
Ink System Mechanism
Capping Mechanism
Pump unit mechanism
Ink Sequence
Electrical Circuit Operating Principles
C417 PSB/PSE board
C418 MAIN/MAIN-B Board
Main Elements
Printhead Driver Circuit
PF Motor (PF/ PUMP/ ASF Motor) Driver Circuit
CR Motor Driver Circuit
Reset Circuit
EEPROM Control Circuit
Sensor Circuit
Troubleshooting
Overview
Troubleshooting with LED Error Indications
and Status Monitor 3 Message
Unit Level Troubleshooting
Disassembly and Assembly
Overview
Precautions
Tools
Screws
Work Completion Check
Disassembly
Upper housing removal
Printhead removal
CR unit removal
CR motor removal
ASF unit removal
PSB/PSE unit removal
Holder shaft unit removal
Circuit board removal
Waste drain ink pad (under the ASF unit) removal
Lower housing removal
Caution regarding Ink system removal, PF roller
unit removal and PF motor removal
Ink system unit removal
(Cap unit, Pump unit & Waste drain ink pad)
PF roller unit removal
PF motor removal
Adjustment
Overview
Required Adjustment
Maintenance
Overview
Cleaning
Service Maintenance
Lubrication Appendix
Connector Summary
Major Component Unit
EEPROM Address Map
Component Layout
Exploded Diagram
Parts List
Electrical Circuits
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