P/N 132305–001, Rev E
P9012 Multifunction Line Printer
WARNING
Note: This equipment has been tested and found to comply with the limits for a Class A digital device,
pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against
harmful interference when the equipment is operated in a commercial environment. This equipment
generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with
the instruction manual, may cause harmful interference to radio communications. Operation of this
equipment in a residential area is likely to cause harmful interference, in which case the user will be required
to correct the interference at his own expense.
Properly shielded and grounded cables and connectors must be used in order to meet FCC emission limits.
The manufacturer is not responsible for any radio or television interference caused by using other than
recommended cables and connectors or by unauthorized changes or modifications to this equipment.
Unauthorized changes or modifications could void the user’s authority to operate the equipment.
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1)
this device may not cause harmful interference, and (2) this device must accept any interference received,
including interference that may cause undesired operation.
The input/output (I/O) cable must be shielded for the printer to comply with FCC rules and regulations Part
15 governing the radiation limits for Class “A” equipment.
This digital apparatus does not exceed the Class A limits for radio noise emissions from digital apparatus set
out in the radio interference regulations of the Canadian Department of Communications.
Ce matériel numérique n’émet pas de bruits radio–électriques supérieurs aux limites fixées pour les
appareils numériques de la Classe A dans le règlement sur le brouillage radio–électrique publié par le
Ministère des Communications du Canada.
Printronix, Inc. makes no representations or warranties of any kind regarding this material, including, but not
limited to, implied warranties of merchantability and fitness for a particular purpose. Printronix, Inc. shall not
be held responsible for errors contained herein or any omissions from this material or for any damages,
whether direct, indirect, incidental or consequential, in connection with the furnishing, distribution,
performance or use of this material. The information in this manual is subject to change without notice.
This document contains proprietary information protected by copyright. No part of this document may be
reproduced, copied, translated or incorporated in any other material in any form or by any means, whether
manual, graphic, electronic, mechanical or otherwise, without the prior written consent of Printronix, Inc.
All rights reserved.
September
, 1992.
P9012 Multifunction Line Printer Maintenance Manual
, P/N 132305–001, Revision E,
Trademark Acknowledgements
IBM is a registered trademark of International Business Machines Corporation.
Printronix is a registered trademark of Printronix, Inc.
17500 Cartwright Road, P.O. Box 19559
Irvine, California 92713
Telephone (714) 863–1900 FAX (714) 660–8682
Technical Support (714) 553–1515
COPYRIGHT 1992, PRINTRONIX, INC.
Table of Contents
1
Overview
Chapter Contents 1–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
About This Manual 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
How to Use This Manual 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Warnings and Special Information 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Printing Conventions 1–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Related Documents 1–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Description 1–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Standard Features 1–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Optional Features 1–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Control Panel Switches and Indicators 1–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mechanical Controls 1–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I/O Panel 1–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tools, Test Equipment, and Supplies 1–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2
Principles of Operation
Chapter Contents 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Scope 2–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Purpose 2–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Matrix Printing 2–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
The Dot Matrix 2–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
The Hammer Bank 2–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Character Generation 2–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Printer Functional Elements 2–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Control Panel 2–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Data Control Unit (DCU) PCBA 2–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mechanism Control Unit (MCU) PCBA 2–18. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mechanism Driver PCBA 2–22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table of Contents
i
Hammer Driver PCBA 2–25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hammer Bank and Shuttle Mechanics/MPU 2–28. . . . . . . . . . . . . . . . . . . . . . . . .
Hammer Bank Assembly/Shuttle 2–28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Magnetic Pickup Unit (MPU) 2–28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Supply 2–30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ribbon Deck 2–32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Paper Feed Control Circuits 2–34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Platen Open/Paper Out Switches 2–36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Safety Circuits 2–37. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Normal Operation 2–38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Character Printing 2–38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Self–Test 2–38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3
4
Scheduled Maintenance
Chapter Contents 3–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preventive Maintenance Checks and Services (PMCS) 3–2. . . . . . . . . . . . . . . . .
Inspecting the Printer 3–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cleaning the Printer 3–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Exterior of Cabinet 3–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Interior of Cabinet 3–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hammer Bank Assembly 3–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting
Chapter Contents 4–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Introduction 4–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fault Messages 4–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operator Correctable Faults 4–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Field Service Required 4–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Symptoms Not Indicated by Fault Messages 4–11. . . . . . . . . . . . . . . . . . . . . . . . .
Diagnostic Self–Tests 4–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Running the Self–Tests 4–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hex Code Printout 4–17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ii
Table of Contents
5
Alignments and Adjustments
Chapter Contents 5–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Alignments and Adjustments 5–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ribbon Tracking Check and Adjustment 5–2. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ribbon Hub Height Adjustment 5–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Setting Shuttle and Counterweight Preload 5–6. . . . . . . . . . . . . . . . . . . . . . . . . .
Shuttle and Counterweight Spring Adjustment 5–10. . . . . . . . . . . . . . . . . . . . . . .
Hammer Spring Retensioning 5–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hammer Tip Alignment 5–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Platen Gap 5–18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Magnetic Pickup Gap 5–20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Magnetic Pickup Phasing Adjustment 5–22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Shuttle Belt Tension 5–24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Paper Feed Belt Tension 5–26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Paper Motion Sensor 5–28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6
Paper Out Detector 5–32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacement Procedures
Chapter Contents 6–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacement Procedures 6–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tools, Test Equipment, and Supplies 6–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Side Panels 6–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Control Panel 6–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ribbon Deck 6–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ribbon Control PCBA 6–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ribbon Drive Motor 6–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Blower and Airflow Assembly 6–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Shuttle Assembly 6–18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hammer Spring 6–22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hammer Coil 6–28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Counterweight Assembly 6–32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Flywheel Assembly 6–36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table of Contents
iii
Cam Wick 6–40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Magnetic Pickup Unit 6–42. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Shuttle Motor 6–44. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Shuttle Belt 6–48. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Paper Ironer 6–50. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Paper Feed Belt 6–52. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Paper Feed Motor 6–56. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tractors 6–58. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Paper Motion Sensor 6–62. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Paper Out Switch 6–66. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Platen Open Switch 6–68. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Exhaust Fan 6–70. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DCU, MCU, Mechanism Driver PCBAs 6–72. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hammer Driver and Power Supply PCBAs 6–74. . . . . . . . . . . . . . . . . . . . . . . . . .
Card Cage 6–76. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Card Cage Fan 6–86. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AC Power Bus Assembly 6–88. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DC Power Bus Assembly 6–90. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hammer Driver Backplane PCBA 6–92. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Logic Backplane 6–94. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendices
A Power Paper Stacker Maintenance
B Interconnect Diagram
C Mnemonics
D Torque Table
E Metric Conversion Tables
iv
Table of Contents
1
Chapter Contents
Overview
About This Manual 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Description 1–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Control Panel Switches and Indicators 1–6. . . . . . . . . . . . . . . . . . . .
Mechanical Controls 1–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I/O Panel 1–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tools, Test Equipment, and Supplies 1–11. . . . . . . . . . . . . . . . . . . . .
Overview
1–1
About This Manual
This manual explains how to maintain and repair P9012 floor cabinet printers
at the field service level of maintenance. This manual covers alignments and
adjustments, preventive and corrective maintenance, basic troubleshooting,
and principles of operation.
This manual does not explain how to configure or operate the P9012 printer.
That information is in the P9012 User’s Manual. The User’s Manual
therefore supplements this manual.
How to Use This Manual
This manual is designed so that you can quickly find the information you
need to maintain and repair the P9012 printer. You can locate maintenance
information three ways:
• Use the Table of Contents at the front of the manual.
• Use the Chapter Contents list on the first page of each chapter.
• Use the Index at the back of the manual.
Read the entire procedure before beginning any maintenance task. Gather all
required tools and make sure you understand all warnings, cautions, and
notes before you begin working on the printer.
Warnings and Special Information
Always read and comply with information highlighted by special headings.
The headings reveal the nature of the information:
WARNING
Conditions that could harm you as well as damage the equipment.
CAUTION
Conditions that could damage the printer or related equipment.
IMPORTANT
Information vital to proper operation of the printer.
1–2
Overview
NOTE: Information concerning printer maintenance considered important
enough to emphasize.
Printing Conventions
Switches, indicators, and switch positions, if labeled on the printer, are
printed in uppercase letters.
Messages that appear on the control panel display are also printed in
uppercase letters. Example: “Press the CLEAR switch to take the printer to
the OFFLINE READY state.”
Related Documents
For additional information about printer configuration and operation, and
optional interfaces, refer to the following documents:
• P9012 Multinational User’s Manual (p/n 133397–001)
• PI 5225 Interface User’s Reference Manual (p/n 140351–001)
• PI 3287 Interface User’s Reference Manual (p/n 108174–001)
• IGP–100/200/400 User’s Manual (p/n 141332–001)
• IGP–110/210/410 User’s Manual (p/n 141333–001)
Overview
1–3
Description
The P9012 Printer (Figure 1–1) is a highly reliable, multi–function dot
matrix line printer. In addition to basic functions, the printer can produce
correspondence quality print for near letter quality (NLQ) printing
requirements, draft print for higher speed, and character attributes (dynamic
character generation) for wider application compatibility.
1–4
Figure 1–1. P9012 Printer
Overview
Standard Features
• Extra Quiet Operation
• P–Series or Serial Matrix Protocols
• Raster Plot and Bit Image Graphics
• Dynamic Character Generation
Selectable Pitch Automatic Underline
Shadow Print Superscript Printing
Elongated Print Subscript Printing
Expanded Print
• Selectable Forms Length
• Nonvolatile Electronic Vertical Formatting
• Resident International Character Sets
• Resident OCR–A and OCR–B Character Sets
• Downloadable Character Sets
• Built–in Self–Tests and Diagnostics
• Configuration Printout
• Datastream Hex Code Printout
• Ribbon Fault Detector
• Resident Serial and Parallel Interfaces
Optional Features
• Intelligent Graphics Processing (IGP)
Forms Generation Reverse Image Printing
Bar Code Printing Logo Generation
Expanded Character Printing
• Additional Character Sets
• Downline Loadable Character Sets
• IBM Interfaces
3287 5225/5224
• Power Paper Stacker
• Dataproducts Long–Line Interface
Overview
1–5
Control Panel Switches and Indicators
The P9012 operator control panel switches and indicators are illustrated in
Figure 1–2 and described in Table 1–1. Refer to the P9012 User’s Manual for
details on control panel operation.
Status Lamps
Message Display
These
switches are provided only if the
printer is equipped with an IBM 3287
interface.
These switches are visible only
with the printer cover open.
ON LINE
CLEAR
6/8 LPI
PAPER ADV
HOLD ENABLE
REPRINT
P
CANCEL PA2
MODE
ALT
MENU UP
MENU DOWN
ON LINE
CHECK
8 LPI
VFU LOADED
A1
NEXT
PREV
RUN/STOP
ENTER F/L
PRINT
MODE
Figure 1–2. Control Panel Switches and Indicators
1–6
Overview
Table 1–1. Control Panel Switches and Indicators
Switch / Indicator Function
Except for ON LINE, all switches function only when the printer is off line.
Status lamps
Message display
ON LINE switch Press to place the printer on line or off line.
ON LINE indicator Illuminates when the printer is on line.
CLEAR switch
CHECK indicator Illuminates when a fault condition occurs.
6/8 LPI switch
8 LPI indicator Illuminates when line spacing is other than 6 lpi.
PAPER ADV
switch
VFU LOADED
indicator
Illuminate when the printer is on line, flash alternately to indicate a fault
condition, and remain off when the printer is off line.
Displays printer status and error messages.
Press to clear a fault indication after a fault has occurred. Press while in a
configuration menu to return the printer to the of
RUN/STOP at the same time to reset the printer.
Press to display and select the current line spacing.
Press momentarily to advance the paper one line. Press and hold to advance the
paper to the next top of form.
Illuminates when the format is being controlled by the vertical format unit.
f line state. Press CLEAR and
HOLD ENABLE
REPRINT PA1
CANCEL PA2
ALT MODE
switches
MENU UP switch Press to view the next menu or submenu. Press MENU UP and
MENU DOWN
switch
NEXT switch Press to display the next parameter and its current value in a configuration or
PREV switch
RUN/ST
OP switch Press to run and stop configuration and self tests. Runs and stops hex dump.
Used only if the printer is equipped with an IBM 3287 interface. For details,
refer to the
same time to lock or unlock the ENTER switch.
Press to view the previous menu or submenu. Press MENU DOWN and
at the same time to lock or unlock the ENTER switch.
diagnostic test menu.
Press to display the previous parameter and its current value in a configuration
or diagnostic test menu.
Press RUN/ST
PI 3287 Interface User’s Refer
OP and CLEAR at the same time to reset the printer.
ence Manual, P/N 108174–001.
(???)
at the
(???)
Overview
1–7
Switch / Indicator Function
ENTER switch Press to enter a displayed parameter into the printer’s nonvolatile memory.
Must be unlocked before using, via the MENU UP or MENU DOWN switch.
PRINT MODE
switch
F/L switch Press to display and select the current forms length.
Press to display and select the current print mode.
Mechanical Controls
P9012 mechanical controls are described in Table 1–2 and illustrated in
Figure 1–3.
Table 1–2. Mechanical Controls
Item No.
(Figure 1–3)
1
Control or
Indicator Function
Forms Thickness
Adjustment Lever
Sets the platen for different thickness forms or paper. Open (raise)
fully for loading paper.
2
3 Horizontal
4 Tractor Lock (2) Locks tractors in position.
5 Vertical
6 Tractor (2) Used to set the left margin and paper width. The left tractor moves
Forms Thickness
Scale and Pointer
Adjustment Knob
Adjustment Knob
Indicates the relative thickness of forms or paper.
Allows fine positioning of the left print mar
slightly to the left or right.
Sets the top of form or first line to be printed. Rotate to move
paper vertically.
approximately one inch. The right tractor moves the full range.
gin. Moves paper
1–8
Overview
1. Forms
2. Forms Thickness Scale/Pointer
3.
4. Tractor Lock (2)
5. V
6. Tractor (2)
Thickness Adjustment Lever
Horizontal Adjustment Knob
ertical Adjustment Knob
3
2
1
4
5
Overview
6
Figure 1–3. Mechanical Controls
1–9
I/O Panel
The P9012 printer supports serial and parallel interfaces. Figure 1–4 shows
the I/O panel on the rear of the printer.
1. RS–232
2. AC On/Off Switch
3. AC Power Connector
4.
5.
1
4
5
Serial Connector
Dataproducts Parallel Connector
Centronics Parallel Connector
1–10
2
3
Figure 1–4. I/O Panel
Overview
Tools, Test Equipment, and Supplies
The tools, test equipment, and supplies required for field level maintenance
of P9012 printers are listed in Table 1–3.
Table 1–3. Tools, Test Equipment, and Supplies
Item Part Number Recommended Item
Adjustable W
Diagonal Cutters
Digital Voltmeter — —
Extension, 3 in., 3/8 Drive — —
Feeler Gauge Set — Proto 000AA
Hammer Tip Alignment Tool 132266–001 —
Isopropyl Alcohol — —
Kimwipes — —
Lubricant 101805–001 —
Nut Driver Set — Xcelite P2120
Oscilloscope and Probes (≥35 MHz)
Pliers, Grip Ring — Truarc 1120
Pliers, Chain Nose
Ratchet, 3/8 in. Drive — —
Rule, Steel, 6 in. — General 616
Scale, Spring, 0 to 40 lbs. — —
Driver, Torque Screwdriver — Utica TS35
Adapter, Torque Screwdriver —
rench —
— Erem 91EH
— —
— Erem 11DH
Utica 91–4C
Utica HW–18
Extension, 6 in., Torque Screwdriver — —
Hex Bit, 3/16 in., Torque Screwdriver —
Hex Bit, 3/32 in., Torque Screwdriver —
Hex Bit, 5/32 in., Torque Screwdriver —
Hex Bit, 5/64 in., Torque Screwdriver — —
Screwdriver, Allen Hex — Xcelite 99PS40
Screwdriver, Phillips —
Screwdriver, Phillips —
Screwdriver, Slot —
Screwdriver, Slot —
Overview
Utica W–8
Utica HW–4
Utica HW–6
Xcelite X100
Xcelite X102
Xcelite A184
Xcelite R3164
1–11
Item Recommended ItemPart Number
Shims, Counterweight 101564–001 —
Shims, Shuttle Assembly
Socket, 7/16 in., 3/8 in. Drive — —
Soldering Iron and Tips — —
X–acto Knife and Blades
103422–001 —
— —
1–12
Overview
2
Chapter Contents
Principles of Operation
Scope 2–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Purpose 2–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Matrix Printing 2–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Printer Functional Elements 2–9. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Control Panel 2–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Data Control Unit (DCU) PCBA 2–14. . . . . . . . . . . . . . . . . . . . . . . .
Mechanism Control Unit (MCU) PCBA 2–18. . . . . . . . . . . . . . . . . .
Mechanism Driver PCBA 2–22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hammer Driver PCBA 2–25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hammer Bank and Shuttle Mechanics/MPU 2–28. . . . . . . . . . . . . . .
Power Supply 2–30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ribbon Deck 2–32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Paper Feed Control Circuits 2–34. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Platen Open/Paper Out Switches 2–36. . . . . . . . . . . . . . . . . . . . . . . .
Safety Circuits 2–37. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Normal Operation 2–38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Principles of Operation
2–1
Scope
Purpose
This chapter presents the principles of operation for the P9012 printer. This
information is intended to provide the technician with a basic understanding
of printer functional operation.
This chapter also provides illustrations which show the location of test points
on the P9012 PCBAs.
For a complete list of signal mnemonics mentioned in this chapter, refer to
Appendix C.
The P9012 printer is a computer output device. It receives data from a host
computer and provides hard copy text or graphics. The hard copy is
composed of an array of dots. In the case of text, these dots are arranged in a
matrix to produce characters.
2–2
Principles of Operation
Matrix Printing
The Dot Matrix
In order to generate characters from dots, the dots must be arranged properly.
The imaginary grid on which the dots are positioned is referred to as the
matrix.
When in the data processing print mode, for spacing of six lines per inch
there are 12 dot rows from the top of one character line to the top of the next
(Figure 2–1 and Figure 2–2). With spacing of eight lines per inch there are
nine dot rows per character line, for nine lines per inch there are eight dot
rows per character line, and for spacing of ten lines per inch there are seven
dot rows per character line.
Elongated characters can be generated by printing each row twice, except for
the first and last (Figure 2–3).
0.01389
0.02
112COLUMN NO.
”
0.10
0.00835
”
”
”
Figure 2–1. Defining the Dot Matrix
FIRST ROW AND
COLUMN OF NEXT
CHARACTER
LOWEST
DESCENDER
LINE
DOT
FIRST ROW AND
COLUMN OF NEXT
CHARACTER LINE
6 LPI)
(AT
Principles of Operation
2–3
UPPERCASE
(REFERENCE)
UNDERLINE
Figure 2–2. Typical Characters
LOWERCASE
WITH DESCENDER
PRINTED
WITH
UNDERLINE
WITH UNDERLINES
DOT COLUMN
13579
DOT ROW
1
2
’
2
3
’
3
4
’
4
5
’
5
6
’
6
7
7
’
8
’
8
9
UNDERLINE
WITHOUT
DOT ROW
1
2
’
2
3
’
3
4
’
4
5
’
5
6
’
6
7
UNDERLINES
DOT COLUMN
13579
2–4
Figure 2–3. Elongated Characters
Principles of Operation
The Hammer Bank
In order to use matrix printing, you must have a method to print the required
dots. The P9012 uses the hammer bank.
The hammer bank contains a number of print hammers mounted on a shuttle
that can move back and forth horizontally. The shuttle prints a full line of
dots during each cycle of back and forth motion.
Each hammer consists of a stiff leaf spring attached at one end to the hammer
bank with a screw (Figure 2–4). The end opposite the screw has a pointed tip
attached. A permanent magnet keeps all the hammers retracted and under
tension. Each hammer has a magnetic coil which when energized counteracts
the permanent magnet, causing the hammer to release and strike the ribbon
and paper, leaving a dot (Figure 2–5). After printing, the rebounding hammer
is recaptured by the permanent magnet.
RIBBON
RIBBON MASK
MAGNET
SHUTTLE SHAFT
HAMMER BANK COVER
PAPER
HAMMER TIP
COIL
COIL
PLATEN
HAMMER SPRING
PAPER IRONER
Figure 2–4. Hammer and Shuttle Arrangement (Typical)
Principles of Operation
2–5
DE–ENERGIZED ENERGIZED
PERMANENT MAGNET
COIL
COIL COIL
NORMAL (RETRACTED) STATE ACTIVATED (RELEASE) STATE
HAMMER
TIP
HAMMER
SPRING
COIL
Figure 2–5. Print Hammer Action
2–6
Principles of Operation
Character Generation
Paper advances one dot row after each shuttle cycle, causing the dot matrix
to be filled as required to generate each character (Figure 2–6 and
Figure 2–7).
DIRECTION OF SHUTTLE MOVEMENT
ONE
CHARACTER
ROW
DOT
ROW START
1
2
3
4
5
6
7
8
*
9
**
10
11
SPACE
12
1
2
1 HAMMER
PRINT SPAN
USED FOR LOWERCASE DESCENDER ONLY
*
USED FOR UNDERLINE AND LOWERCASE DESCENDER
**
NOTE:
The P9012 shuttle sweeps through 1.5 character positions at 10 cpi.
1 HAMMER
PRINT SPAN
PAPER
ADVANCES
PAPER
FEED
PAPER
ADVANCES
Figure 2–6. Standard Character Formation
Principles of Operation
2–7
SHUTTLE
SCAN
DOT
* 1 * 1
ROW
SUCCESSIVE HAMMER STROKES PER SCAN
DOT COLUMN
*
1 3
5
* 1
3 5 7 1 3 5 7 9
* * 3
1
2
3
4
5
6
1
1
2
1
2
3
1
2
3
4
1
2
3
4
5
1
2
3
4
5
6
1
2
3
4
5
6
7
7
* EVEN COLUMN DOT CENTERS WITHIN THE PRINTED CHARACTER AREA
AND CHARACTER SPACE HAMMER POSITIONS ARE NOT ILLUSTRATED
IN THIS DIAGRAM.
NOTE: = DOT
= NO DOT WHERE HAMMER HAS BEEN
= HAMMER POSITION
Figure 2–7. Character Formation by One Hammer
2–8
Principles of Operation
Printer Functional Elements (Figure 2–8 and Figure 2–9)
The printer is made up of the following functional elements:
• Control Panel
• Data Control Unit (DCU) PCBA
• Mechanism Control Unit (MCU) PCBA
• Mechanism Driver PCBA
• Hammer Driver PCBA(s)
• Hammer Bank and Shuttle Mechanics/Magnetic Pickup (MPU)
• Power Supply PCBA(s)
• Ribbon Deck
• Paper Transport
• Platen Open/Paper Out Switches
Figure 2–8 shows the basic interrelation of these elements and Figure 2–9 is
a simplified block diagram of the printer.
Principles of Operation
2–9
TRACTOR
(Paper T
ransport)
PAPER OUT
SWITCH
RIBBON DECK
PLATEN OPEN SWITCH
CONTROL PANEL
SHUTTLE MOTOR
/ MPU
(Shuttle Mechanics)
HAMMER BANK / SHUTTLE
2–10
PCBAs
Figure 2–8. Printer Functional Elements
Principles of Operation
SERIAL
HOST I/O
PARALLEL
DATA
CONTROL
STATUS
DATA
CONTROL
STATUS
CONTROL
PANEL
S
T
D
A
A
T
T
U
A
S
S
W
I
T
C
H
FAULT/STATUS
DCU MESSAGE
READY, READ
MESSAGE
BEEPER
DCU MCU
DO–D7
HSC
COM
+5V GND
MOTOR
CONTROL
FAULTS
SENSE
PM1–PM4
FROM P/SFROM MECH DRIVER
+36V GND –12V
MECHANISM
DRIVER
FAULT CIRCUITS
PAPER TRANSPORT
DRIVE
SHUTTLE DRIVE
RIBBON DRIVE
P/S CIRCUITS
+5V
–12V
+12V
GND
TO
DCU
AND
MCU
AC
POWER
120V
240V
50 or 60 Hz
–12V
GND
+12V
+5V
FROM MECH DRIVER
FROM P/S
POWER SUPPLY
+36V
GND
–12V
C
O
M
HAMMER
DRIVERS
HAMMER
+36V
GND
–12V
N
N
H
S
C
H
F
H
U
R
A
C
D
S
U
K
L
T
BANK
TO HAMMER DRIVER
AND MECH DRIVER
D
P
R
O
S
V
I
E
T
I
O
N
PAPER
DRIVE
STEPPER
MOTORDCMOTORDCMOTORS
SHUTTLE
DRIVE
I
S
E
N
S
E
RIBBON
DRIVE
FAULT
(IL/AIR)
BLOWER
ASSEMBLY
D
R
V
E
I
FAN
FAN
FAN
F
A
U
L
T
PLATEN
OPEN/
PAPER
OUT/
PAPER
MOTION
P
B
M
L
D
R
Principles of Operation
Figure 2–9. System Block Diagram
2–11
Control Panel (Figure 2–10 and Figure 2–11)
The control panel consists of ten indicators, 16 momentary contact switches,
and an LCD alphanumeric display.
The control panel processes and sends switch closure information to the
DCU. It receives information on setting up the alphanumeric display as well
as status information. For a detailed discussion of panel operation, refer to
the P9012 User’s Manual.
Status Lamps
Message Display
These
switches are provided only
if the printer is equipped with an
IBM 3287 interface.
These switches are visible only
with the printer cover open.
ON LINE
CLEAR
6/8 LPI
PAPER ADV
HOLD ENABLE
REPRINT PA1
CANCEL
P
A2
ALT
MODE
MENU UP
MENU DOWN
NEXT
PREV
ON LINE
CHECK
8 LPI
VFU LOADED
RUN/STOP
PRINT MODE
ENTER F/L
2–12
Figure 2–10. Control Panel
Principles of Operation
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