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Croma24 Service Manual
Table of Contents

Chapter 1 General Description............................................................. 17

Introduction ...............................................................................................................17
Overview ...................................................................................................................18
Related Publications........................................................................................... 18
Electrostatic Discharge (ESD) Sensitivity.................................................................. 18
Warnings, Cautions, and Notes.................................................................................19
Printer Specifications ................................................................................................20
Contents of this Service Manual................................................................................ 21
Technical Support .....................................................................................................23

Chapter 2 Theory of Operation............................................................. 25

Introduction ...............................................................................................................25
Croma24 Printer General Block Diagram.................................................................. 25
Paper (Media) Axis Drive ..........................................................................................27
The Carrier Axis Drive............................................................................................... 28
Main Printed Circuit Board (MPCB)........................................................................... 29
Microprocessor................................................................................................... 30
Gate Array ..........................................................................................................30
Memory Circuits..................................................................................................31
Stepper Motor Controller.....................................................................................33
Servo Motor Controller........................................................................................ 34
Interface Circuits: Serial & Parallel......................................................................36
Carrier Assembly Circuits.......................................................................................... 37
Power Supply............................................................................................................ 38
System Grounding ....................................................................................................38
Front Key Controls ....................................................................................................40

Chapter 3 Maintenance......................................................................... 43

Introduction ...............................................................................................................43
Scheduled Maintenance............................................................................................ 43
Cleaning Procedures ..........................................................................................44
External Cleaning......................................................................................... 44
Slide Shaft Cleaning..................................................................................... 44