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                                                                       BULLETIN NO. 231
                                                                         2
                                                                       64 MEMORY MAINTENANCE




                                         2
                                       64 MEMORY
                           PREVENTIVE MAINTENANCE PROCEDURES




                                                      July, 1958




                                       MILITARY PRODUCTS DIVISION

                       INTERNATIONAL BUSINESS MACHINES CORPORATION

                                                  KINGSTON, NEW YORK
                                                                                        IBM
                                                                                    f         ~D
                                                                                    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 THIS INFOR-
MATION MAY BE USED FOR COMMERCIAL APPUCA-
TIONS.
                 FOREWORD

The information contained herein has never
appeared in any previous publication. It rep-
resents the initial step of providing scheduled
preventive maintenance checks for the 64 2
memory.

The preventive maintenance checks are func-
tionally divided into two groups; those requir-.
ing scoping, and those not requiring scoping
such as mechanical, resistance, and voltage
checks. It is recommended that all checks be
performed in accordance with the schedule
provided in the text. This schedule reflects
current concepts of equipment requirements
and is subject to review based on field experi-
ence.

Valuable computer time will be saved if the
reader familiarizes himself with the contents
of this Instruction Bulletin before proceeding
with the checks. It will be noted that where
outside references are required the reader is
directed, in the text, to the applicable In-
struction Bulletin.

Comments on this Instruction Bulletin are
solicited from the field. It is recognized that
maintenance is a dynamiC undertaking and
that new and improved techniques and proce-
dures are the inevitable result of on-the-job
experience. Forward all correspondence to
Field Technical Assistance, Department 912,
Kingston, New York.
                           TABLE OF CONTENTS

Heading                                                     Page

1.        Preventive Maintenance Requiring Scoping             1
1.1         Philosophy                                         1
1.1.1          Statistical Summary   .                         1
1.1.2          Memory Driver Panels                            2
1.2         Specific Advantages                                2
1.3         Preventive Maintenance Chart Procedures .          2
1.3.1          General                                         2
1.3.2          Equipment Requirements                          2
1.3.3          Procedural Step Analysis                        3
2.        Preventive Maintenance Not Requiring Scoping         7
2.1         Introduction                                       7
2.2         Fuse Check 

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