Ithaca 75 User manual

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Disclaimer
Information in this publication is subject to change without notice and does not
represent a commitment on the part of Ithaca Peripherals Incorporated.
However, as product improvements become available, Ithaca Peripherals will
make every effort to provide updated information for the products described in
this publication.
Ithaca Peripherals cannot guarantee that changes in software and equipment
made by other manufacturers, and referred to in this publication, do not affect
the applicability of the information in this publication.
Copyright
Copyright © 1995
Ithaca Peripherals Incorporated
A Subsidiary of Tridex Corporation
Ithaca, New York U.S.A.
All Rights Reserved. No part of this publication may be reproduced, stored in a
retrieval system, or transmitted, in any form or by any means, mechanical,
photocopying, recording, or otherwise, without the prior written permission of
Ithaca Peripherals Incorporated.
First Edition, April 1995
Printed in U.S.A.
Trademarks
PcOS® is a registered trademark of Ithaca Peripherals Incorporated. Ithaca
Peripherals Incorporated is a subsidiary of Tridex Corporation.

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Federal Communications Commission
Radio Frequency Interference Statement
This equipment complies with the limits for a Class A computing device in
accordance with the specifications in Part 15 of FCC rules which are designed
to minimize radio frequency interference in the installation; however, there is no
guarantee that radio or television interference will not occur in any particular
installation. If this equipment does cause interference to radio or television
reception, which can be determined by turning the equipment off and on while
the radio or television is on, the user is encouraged to try to correct the
interference by one or more of the following measures:
♦Reorient the radio or television receiving antenna;
♦Relocate the printer with respect to the receiver;
♦Move the printer away from the receiver;
♦Plug the printer into a different outlet so that the printer and the receiver are
on different outlets.
If necessary, the user should consult the dealer or an experienced
radio/television technician for additional suggestions. The user may find the
following booklet prepared by the Federal Communications Commission
helpful: How to Identify and Resolve Radio/TV Interference Problems.
This booklet is available from the U.S. Government Printing Office,
Washington, DC 20402. Order stock number 004-000-00345-4.

Table of Contents iii
TABLE OF CONTENTS
PRODUCT INFORMATION 1
Communication Interfaces ..........................................................................2
Parallel Interface................................................................................2
Serial Interface...................................................................................2
Technical Specifications.............................................................................4
Performance and Reliability ...............................................................4
Printing..............................................................................................4
Physical Dimensions ..........................................................................4
Environmental Operating Limits.........................................................5
Power Requirements...........................................................................5
Consumable Products.........................................................................5
MAINTENANCE 7
Necessary Tools.........................................................................................7
Lubricating the Printer................................................................................8
Lubricating the Journal Take-up Gears and Pressure Roll Bearing ......8
Lubricating the Auto Cutter Assembly................................................9
Lubricating the Transport-Auto Cutter Assembly .............................10
Cleaning the Printer..................................................................................11
Making Adjustments.................................................................................11
Diagnosing the Print Quality ............................................................12
Adjusting the Platen Parallel to the Printhead....................................13
Adjusting the Platen Air Gap............................................................15
Replacing the Feed Roll Shaft ..........................................................17

Series 70 Maintenance Manualiv
DISASSEMBLY 19
Necessary Tools.......................................................................................19
Transport-Auto Cutter Assembly..............................................................20
Removing the Transport-Auto Cutter Assembly................................20
Disassembling the Transport-Auto Cutter Assembly.........................22
Auto Cutter Assembly (Without Transport) ..............................................26
Removing the Auto Cutter Assembly................................................26
Disassembling the Auto Cutter Assembly .........................................28
Base Assembly.........................................................................................30
AC Switch Assembly and Power Transformer...........................................32
Serial Interface Board...............................................................................34
Control Board ..........................................................................................36
Interconnect Board ...................................................................................38
Journal Bucket Assembly..........................................................................40
Removing the Journal Bucket Assembly ...........................................40
Disassembling the Journal Bucket Assembly.....................................42
Carriage Assembly...................................................................................44
Space Motor Assembly ....................................................................44
Carriage Shaft Bearing and Space Rack ...........................................46
Feed Roll Shaft.........................................................................................48
Linefeed Motor Assembly.........................................................................50
TROUBLESHOOTING 53
Determining the Problem ..........................................................................53
Fixing the Problem ...................................................................................54
Checking Connections and Resistance.......................................................72
Printhead .........................................................................................72
Space Motor Assembly ....................................................................73
Linefeed Motor ................................................................................74

Table of Contents v
APPENDIX A: SPARE PARTS 75
Standard Printer Parts ..............................................................................75
Optional Auto Cutter Parts.......................................................................77
APPENDIX B: THEORY OF OPERATION 79
Electrical Operation..................................................................................79
Circuit Operation.............................................................................79
Initialization.....................................................................................80
Communication Interface Control.....................................................80
Printhead Drive Circuit ....................................................................81
Carriage Drive.................................................................................82
Linefeed...........................................................................................83
Alarm Circuits.................................................................................84
Power Supply ..................................................................................84
Mechanical Operation...............................................................................85
Printhead Mechanism and Operation ................................................85
Space Mechanism and Operation......................................................86
Ribbon Feed Mechanism and Operation............................................86
Paper Feed Mechanism and Operation..............................................87
Paper-Low Detection Mechanism and Operation...............................87
APPENDIX C: SCHEMATICS 89
Control Board ..........................................................................................90
Serial Interface Board...............................................................................94
Interconnect Board ...................................................................................96
INDEX 97

Product Information 1
PRODUCT INFORMATION
Figure 1: Series 70 Printer
The Series 70 Printer models are 40-column, high-speed, impact printers and
are available in the following configurations.
Series 70
Models Receipt Printing Journal Printing Paper Low
Switch
Transport-
Auto
Cutter
Option
Auto
Cutter 6.0 Inch Receipt
Roll
Option
Model 75 √√ √√ √√ √√ √√
Model 76 √√ √√ √√ √√ √√

Series 70 Maintenance Manual2
COMMUNICATION INTERFACES
Parallel and serial communication interfaces are available.
PARALLEL INTERFACE
Figure 2: Connector for Parallel Interface
The parallel interface is standard on all models and is compatible with
Centronics.
SERIAL INTERFACE
Figure 3: Connector for Serial Interface
The RS-232C serial interface is optional on all models.