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Models 51C and 52C
Maintenance Concepts
SY27 -2528-2
Third Edition (February 1981)
This edition is a revision of and supersedes SY27-2528-1. The new
information concerns the X.21 Switched Feature. I n addition to
technical changes throughout this manual, the 31SD Diskette Drive
Parts Catalog has been removed. The 31SD parts catalog is now
included in Appendix F of 3274 Control Unit Models 51C and 52C
Maintenance Information, SY27-2513.
I BM has prepared this maintenance manual for the use of IBM
customer engineers in the installation, maintenance, or repair of the
specific machines indicated. I BM makes no representations that it
is suitable for any other purpose.
The drawings and specifications contained herein shall not be repro-
duced in whole or in part without written permission.
I nformation contained in this manual is subject to change from time
to time. Any such change will be reported in subsequent revisions
or Technical Newsletters.
It is possible that this material may contain references to, or infor-
mation about, I BM products (machines and programs), programming,
or services that are not announced in your country. Such references
or information must not be construed to mean that I BM intends to
announce such IBM products, programming, or services in your
country.
Requests for copies of I BM publications should be made to your
I BM representative or to the I BM 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
Cotporation, Department 52Q, Neighborhood Road, Kingston, N.Y.
12401. I BM may use or distribute any of the information you sup-
ply in any way it believes appropriate without incurring any obliga-
tion whatever. You may, of course, continue to use the information
you supply.