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Bulletin No. 233
64 Memory Maintenance
64 2 MEMORY MAINTENANCE
REMOVAL AND REPLACEMENT PROCEDURES
July, 1958
MILITARY PRODUCTS DIVISION
INTERNATIONAL BUSINESS MACHINES CORPORATION
KINGSTON, NEW YORK
IBM
r-1
KINGSTON
The work reported in this document was performed under a ~
government contract. Information contained herein is of a TECHNICAL
proprietary nature. ALL INFORMATION CONTAINED PUBLICATIONS
HEREIN SHALL BE KEPT IN CONFIDENCE. No informa-
tion shall be divulged to persons other than IBM employees
authorized by the nature of their duties to receive such in-
formation or individuals or organizations who are author-
ized in writing by the Department of Engineering or its ap-
pOintee to receive such information. GOVERNMENT RE-
LEASE MUST BE OBTAINED THROUGH THE CONTRACT
ADMINISTRATION DEPARTMENT BEFORE THlS INFOR-
MATION MAY BE USED FOR COMMERCIAL APPLICA..
TIONS. .
UNCLASSIFIED
FOREWORD
The information contained herein supersedes
the. related text on removal and replacement
procedures in the Preliminary Maintenance
Data Book on Core Memory, and in T.O.
31P2-2FSQ7-142 dated April 1, 1957. Sup-
plementary information on memory array
assembly and part details is available in
Volume In of T.O. 31P.2-2FSQ7-4, Illustrated
Parts Breakdown (first revision) pages 322-
359.
This bulletin is intended to be self-contained
with regard to removal and replacement pro-
cedures only. In those instances where re-
placement of a critical unit necessitates
electrical adjustment, reference is made in
the text to the applicable Instruction Bulletin.
UNCLASSIFIED
UNCLASSIFIED
TABLE OF CONTENTS
Heading Page
1.. Memory Array Cover Removal