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Maintenance Library

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Models 51 C, 52C, and 61 C
Maintenance Concepts

SY27 -2528-6
Federal Communications Commission (FCC) Statement

Warning: This equipment generates, uses, and can radiate radio
frequency energy and if not installed and used in accordance with
the instructions manual, may cause interference to radio com-
munications. It has been tested and found to comply with the
limits for a Class A computing device pursuant to Subpart J of Part
15 of FCC Rules, which are designed to provide reasonable
protection against such interference when operated in a commercial
environment. Operation of this equipment in a residential area is
likely to cause interference in which case the user at his own
expense will be required to take whatever measures may be required
to correct the interference.

IBM Statement

This warning is also applicable to all attaching units produced for
use in the U.S.A. that have been manufactured after December 31,
1980. A notice of compliance has been affixed within the customer
access area of all affected units.

Seventh Edition iNovember 19B4i

This major revision obsoletes SY27-2528-5. Significant changes
having been made throughout, this edition should be reviewed in its

The drawings and specifications contained herein shall not be repro-
duced in whole or in part without written permission.

IBM has prepared this maintenance manual for the use of IBM
customei engineeis in the installation, maintenance, Oi iepaii of the
specific machines indicated. IBM makes no representations that it is
suitable for any other purpose.

Information contained in this manual is subject to change from time
to time. Any such change will be reported in subsequent revisions
or Technical Newsletters.

References in this publication to IBM products, programs, or
services do not imply that IBM intends to make these available in all
countries in which IBM operates. Any reference to an IBM program
product in this publication is not intended to state or imply that
only IBM's program product may be used. Any functionally equiva-
lent program may be used instead.

Publications are not stocked at the address given below. Requests
for IBM publications should be made to your IBM representative or
to the IBM branch office serving your locality.

A form for readers' comments is provided at the back of this publi-
cation. If the form has been removed, address comments to IBM
Corporation, Department 52Q, Neighborhood Road, Kingston, N. Y.
U.S.A. 12401. IBM may use or distribute whatever information
you supply in any way it believes appropriate without incurring any
obligation to you.