IBM 3277 Troubleshooting Manual page 2

Preface
The IBM 3270 Information Display System consists of
control units, display stations, printers, and optional
feature devices. This manual contains all the information
required to maintain IBM 3277 Display Stations and
features such as keyboards, selector-light pen, magnetic
card reader, security keylock, and audible alarm. The
purpose of this manual is to present maintenance and repair
information rather than theory of operation information.
The titles and form numbers of the two control unit
Trou bleshooting Guides are listed below under
"Companion Manuals". Both Troubleshooting Guides con-
tain a glossary of terms that are applicable to control units
and display stations.
Companion Manuals:
•
3271 Control Unit Models
1
and 2 Troubleshooting
Guide, SY27-2311
•
3272 Control Unit Models
1 and 2 Troubleshooting
Guide, SY27-2312
•
3275/3277 Display Station Models 1 and
2
Parts
Catalog,
S 126-0006
This manual is organized in eight sections. Sections 1
and 2 contain introductory and maintenance background
material. Sections 3, 4, and 5 contain the Symptom Index,
Troubleshooting Diagrams, and repair data. These three
sections contain all diagnostic procedures and repair infor-
mation necessary to correct a display station malfunction.
Miscellaneous reference data is included in Section 6.
Section 7 contains location diagrams to aid in identifying
and locating the display station components referenced in
other sections of this manual. Instructions for installing the
display station are presented in Section 8.
• IDR-M ID Reader-Motorized Theory-Maintenance-Parts
Catalog, SY26-4188
To successfully use this manual and repair IBM 3277
display stations, maintenance personnel should have a level
of training equivalent to the 3270 system basic FE course.
Because the 3277 attaches to both local and remote control
units, an understanding of the control unit to which the
display station is attached is also helpful.
Sixth Edition (July, 1975)
The following pUblications may also prove useful:
• An Introduction to the 3270 Information Display
System, GA27-2739
• IBM 3270 Information Display System Component
Description, GA27-2749
This is a major revision of, and obsoletes, SY27-2314-4 with Technical Newsletter
SN31-0146. The TN L incorporated maintenance information about fuses. This infor-
mation is included in Chapters 4, 5, and 7. Several corrections are made to the
Troubleshooting Diagram in Chapter 4. Other technical and editorial corrections are
made throughout the manual. Significant changes or additions to the text and
illustrations are indicated by a vertical line to the left of the change.
This edition applies to display stations at Board EC level 717946 and earlier. Changes are
periodically made to the information herein; any such changes will be reported in
subsequent revisions or Technical Newsletters.
Text for this manual has been prepared with the IBM SELECTRIC ®Composer.
A form is provided at the back of this publication for reader's comments. If the form has
been removed, comments may be addressed to: IBM System Communications Division,
Product Publications, Dept. 52L, Neighborhood Road, Kingston, N.Y., 12401
©Copyright International Business Machines Corporation, 1972, 1973, 1974, 1975'
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