Atari 1025 Quick start guide

COPYRIGHT ©1983 BY ATARI, INC. ALL RIGHTS RESERVED.
No part of this publication may be reproduced by* any mechanical, photographic, or
electronic process, or in the form of aphonographic recording, nor may it be stored in
aretrieval system, transmitted, or otherwise copied for public or private use, without
permission from ATARI, Inc.
Published By:
ATARI, INC.
1265 Borregas Avenue
P.O. Box 427
Sunnyvale, California 94086

ATARI
1025™ PRINTER
FIELD SERVICE MANUAL

Atari believes that the information described in this manual is accurate and reliable,
and much care has been taken in its preparation. However, no responsibility, financial
or otherwise, shall be accepted for any consequences arising out of the use of this
material. Information contained herein is subject to change. Revisions may be issued
to advise of such changes and/or additions.
Correspondence regarding this document should be forwarded to Director of Technical
Support, Consumer Product Service, Atari, Incorporated, 845 W. Maude, Sunnvvale
California 94086. 7’

TABLE OF CONTENTS
Section
1
2
3
4
Title Page
INTRODUCTION vii
THEORY OF OPERATION 1-i
Introduction 1_1
Mechanical Theory 1_1
Print Head Mechanism and Operation 1-1
Space Mechanism and Operation 1-3
Ribbon Feed Mechanism and Operation 1-4
Paper Feed Mechanism and Operation 1-5
Paper Lock Release Mechanism 1-6
Paper End Detecting Mechanism 1-6
Electrical Theory 1_7
Introduction 1_7
8051 Microprocessor 1-g
8155 RAM I/O l_g
2732 EPROM l_g
Power Supply l_g
Print Head 1_8
SILKSCREEN AND SCHEMATIC 2-1
MAINTENANCE/TESTING AND TROUBLESHOOTING 3-1
Equipment Required 3_1
General Maintenance Precautions 3-1
Cleaning 3_2
Diagnostic Program for Testing the 1025 3-2
ROM Self-Test Procedure 3_7
Specfic Command Code Failures 3-7
DISASSEMBLY/ADJUSTMENT/ASSEMBLY PROCEDURES 4-1
Upper Cover Disassembly 4_1
PCB Disassembly 4_1
Printer Unit Disassembly 4_2
Transformer Replacement 4_2
Print Head Disassembly 4_2
Carriage Frame Disassembly 4_3
Space Motor Replacement 4_3
Space Belt Tension Adjustment 4-4
Space Belt Replacement 4_4
Platen Disassembly 4_5
Atari 1025 Printer
Field Service Manual

TABLE OF CONTENTS
Section Title Page
Platen Assembly 4-6
Platen/Print Head Adjustment 4-6
Platen/Paper Separator Adjustment 4-7
Carriage Frame Assembly 4-8
First Character Printing Position Adjustment 4-8
Inserting the Print Head 4-9
Printer Unit Assembly 4-9
PCB Assembly 4-10
Upper Cover Assembly 4-10
51025 DIAGNOSTIC FLOWCHART 5-1
6SYMPTOM CHECKLIST 6-1
7PARTS LIST 7-1
Mechanical Parts 7-1
Electronic Parts 7-3
8SERVICE BULLETINS 8-1
Atari 1025 Printer
Field Service Manual IV

LIST OF ILLUSTRATIONS
Figure Number Title •Page
1-1 Printing Mechanism 1-2
1-2 Spacing Mechanism 1-3
1-3 Ribbon Feed to Left 1-4
1-4 Ribbon Feed to Right 1-5
1-5 Paper Feed Mechanism 1-5
1-6 Paper Lock Release Mechanism 1-6
1-7 Paper End Detecting Mechanism 1-6
1-8 PCB Functional Block Diagram 1-7
1-9 Print Head Pattern of the Letter I1-9
3-1 Sample Diagnostic Printout 3-5
4-1 Printer Unit 4-11
4-2 Cover Unit 4-13
4-3 Carriage Assembly 4-15
4-4 Base Unit Assembly 4-17
4-5 Space Belt Tension Adjustment 4-4
4-6 Ribbon Assembly 4-19
4-8 Platen/Print Head Adjustment 4-7
4-9 Platen/Paper Separator Adjustment 4-7
4-10 First Character Printing Position 4-9
LIST OF TABLES
Table Number Title Page
3-1 Character Command Codes 3-4
Atari 1025 Printer
Field Service Manual v

INTRODUCTION
TW
The ATARI 1025 'Printer Field Service Manual is organized in eight sections.
•THEORY OF OPERATION -Overview of the mechanical and electrical
theory of the 1025.
•SILKSCREEN AND SCHEMATIC -The silkscreen of the PCB component
layout and the schematic of the PCB and print mechanism.
•MAINTENANCE, TESTING AND TROUBLESHOOTING -Procedures for
maintaining, testing and repairing the 1025.
•DISASSEMBLY/ASSEMBLY -Step by step instructions on how to disassemble
and assemble the unit for component level repair.
•DIAGNOSTIC FLOWCHART -Flowchart enabling the technician to test and
troubleshoot adefective 1025.
•SYMPTOM CHECKLIST -For the experienced technician, alist of symptoms
with their probable causes and remedies.
•PARTS LIST -All parts available for the mechanical and electrical repair and
maintenance of the 1025. r
•SERVICE BULLETINS -Section to be used to hold service bulletins released
by the Director of Technical Support. These bulletins include changes in
recommended repair procedures and required modifications for units in the
field.
vii
Atari 1025 Printer
Field Service Manual