Control Data Corporation CDC CC63X Hardware Maintenance Manual page 9

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PREFACE
This manual provides maintenance information for the display
terminal hardware only. For the maintenance of any applications
(hardware, software, or firmware) added to the terminal, refer to
the applicable maintenance manual covering that application.
This manual is also the only training document. ·Due to few parts,
self-contained diagnostics, and modular construction of the
display terminal, no classroom instruction is offered. By
carefully reading the information in this manual, the customer
engineer (CE) will be prepared to isolate display terminal
hardware problems.
Section 1 lists the self-study objectives, and section 6 lists the
tasks to be performed before responding to a customer request for
maintenance.
Reference to the following listed manuals may be necessary during
maintenance. These manuals are divided into groups which cover
the enhanced model terminals and the original model terminals. An
enhanced model terminal is either a new production CC634-B/CC638-B
unit or an earlier built CC634-A/CC638-A unit with the YR109-A
enhanced firmware option installed. An original model terminal is
a CC634-A/CC638-A unit without the YRI09-A option installed.
MANUALS COVERING ENHANCED MODEL TERMINALS:
Title
721 Enhanced Display Terminal
Operator's Guide/Installation Instructions
721 Display Terminal Owner's Manual*
721 Enhanced Display Terminal
Hardware Reference Manual
Publication Number
62950101
62940101
62940102
*The owner's manual is a replacement for the earlier Operator's
Guide/Installation manual having the same publication number.
62940034 E ix
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