IBM SY27-2528-2 3274 Contol Unit Models 51C and 52C Maintenance Concepts Feb81 free download

File name SY27-2528-2_3274_Contol_Unit_Models_51C_and_52C_Maintenance_Concepts_Feb81.pdf

-- - - - - -- - -- - - - - -- - - - - - ---~ - - _ '; - ------- = == ...' == Maintenance Library -- -- - --- - - -- - - --- - -- - --- - - - - - - - -- -- - - - -... - - - '- Control Unit ----- ~-- - - 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.