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Field Engineering
Maintenance Manual




Restricted Distribution

This manual is intended for internal use only and may not be
used by other than IBM personnel without IBM's written permission.




~ ~ ~ @Display Unit Modell
PREFACE

This manual provides the customer engineer (CE) 2250-1 Dlustrated Parts Catalog (IPC), Form
with information useful for preventive and correc- 123-0442
tive maintenance of the IBM 2250 Display Unit, IBM.System/360 I/O Interface - Channel to
Model 1. This edition updates the former edition Control OEMI, Form A22-6843
(Form Y27 -2045-0) and incorporates the graphic SLT Component Circuits Manual, Form
design feature FE supplement (Form Z27-2572). Z22-2798 (IBM Confidential, for release only
Text in this maintenance manual is supported by to authorized persons)
references to diagrams located in the FE Diagram SLT Common Power Supply Manual, Form
Manual (Form Y27-2044). The following are re- 223-2799
lated manuals and reference material that may be SLT Packaging Manual, Form Z22-2800 (IBM
used in conjunction with this manual: Confidential, for release only to authorized
persons)
It is assumed that the CE who services the
2250-1 FE Theory of Operation (FETOM), 2250-1 has had experience and/or training on the
Form Y27-2043 unit and is familiar with the following:
2250-1 FE Diagram Manual (FEDM), Form 1. 2250-1 Diagnostic Programs
Y27-2044 2. Use of oscilloscope and related tools
2250-1 FE Installation Manual (FEIM), Form 3. CRT Safety precautions and protective
226-2022 equipment




This manual has been prepared by the IBM Systems Development Division
Product Publications, Dept. 520, CPO Box 120, Kingston, N. Y., 12401.
Address comments concerning the manual to this address.