Service manual

EPSON Stylus PHOTO 870/1270 Revision B
6
Table of Contents
PRODUCT DESCRIPTIONS
OVERVIEW ..................................................................................................10
Features ..................................................................................................10
Accessories, Consumable Products, and Options ..............................11
BASIC SPECIFICATIONS ............................................................................13
Printing Specification ............................................................................13
Paper Specifications ..............................................................................15
Printing Area ..........................................................................................16
Cut Sheet ........................................................................................16
Envelopes .......................................................................................17
Adjust Lever ...........................................................................................17
Ink Cartridge ...........................................................................................17
Input Data Buffer ...................................................................................18
Electric Specification .............................................................................18
Reliability ................................................................................................19
Safety, EMC ............................................................................................19
Acoustic Noise .......................................................................................19
CE marking .............................................................................................19
Environmental Condition ......................................................................20
INTERFACE ..................................................................................................21
Parallel Interface (Forward Channel) ...................................................21
Parallel Interface (Reserve Channel) ....................................................24
USB Interface .........................................................................................26
Prevention of Data Transfer Time-out .................................................27
Interface Selection .................................................................................27
IEEE1284.4 Protocol ...............................................................................27
OPERATIONS ..............................................................................................28
Buttons ...................................................................................................28
LED Indicators ........................................................................................28
Panel Functions .....................................................................................29
Special Setting Mode ............................................................................29
Printer Condition and Panel Status ......................................................30
Errors ......................................................................................................30
Printer Initialization ...............................................................................31
DIMENSION ................................................................................................31
OPERATING PRINCIPLES
OVERVIEW ..................................................................................................33
Printhead Mechanism ...........................................................................34
Carriage Mechanism .............................................................................35
Carriage Motor (CR Motor) ...........................................................35
Platen Gap (PG) /Parallelism Adjustment Mechanism ...............36
Carriage Home Position (HP) Detection .......................................36
Paper Feeding Mechanism ...................................................................36
CR Lock Mechanism ......................................................................38
Paper Loading Mechanism ...................................................................39
Drive Transmission to the ASF Unit .............................................39
Paper Loading Operation ..............................................................40
Pump Mechanism ..........................................................................41
Capping Mechanism ......................................................................42
ELECTRICAL CIRCUIT OPERATING PRINCIPLES .....................................43
C298PSB/PSE Board ..............................................................................43
Electrical Circuit .............................................................................43
Protection Circuits .........................................................................45
Power Supply Control Function ...................................................45
Energy Save Mode ........................................................................45
C304MAIN Board Circuit Operation Principles ...................................46
Printhead Driver Circuit .................................................................48
Reset Circuit ...................................................................................49
Motor Driver Circuit .......................................................................49
ASF/Pump Motor Driver Circuit ....................................................52
EEPROM Control Circuit ................................................................53
Sensor Circuit ................................................................................53
TROUBLESHOOTING
OVERVIEW ..................................................................................................56
Self-Diagnostic Function .......................................................................57