iv
Libretto 50CT/70CT Maintenance Manual
Conventions
This manual uses the following formats to describe, identify, and highlight terms and
operating procedures.
Acronyms
On the first appearance, and whenever necessary for clarification, acronyms are enclosed in
parentheses following their definition. For example:
Read Only Memory (ROM)
Keys
Keys are used in the text to describe many operations. The keytop symbol as it appears on
the keyboard is printed in
boldface
type.
Key operation
Some operations require you to simultaneously use two or more keys. We identify such
operations by the keytop symbols separated by a plus (+) sign. For example,
Ctrl
+
Pause
(Break)
means you must hold down
Ctrl
and at the same time press
Pause (Break)
. If three
keys are used, hold down the first two and at the same time press the third.
User input
Text that you are instructed to type in is shown in the boldface type below:
DISKCOPY A: B:
The display
Text generated by the Libretto 50CT, that displays on the screen, is presented in the typeface
below:
Format complete
System transferred
Summary of Contents for Libretto 50CT
Page 8: ...viii Libretto 50CT 70CT Maintenance Manual ...
Page 10: ...Chapter 1 Hardware Overview ...
Page 11: ...1 ii Libretto 50CT 70CT Maintenance Manual ...
Page 30: ...Chapter 2 Troubleshooting Procedures ...
Page 31: ...2 ii Libretto 50CT 70CT Maintenance Manual ...
Page 61: ...Chapter 3 Tests and Diagnostics ...
Page 62: ...3 ii Libretto 50CT 70CT Maintenance Manual ...
Page 64: ...3 iv Libretto 50CT 70CT Maintenance Manual 3 22 2 Operations 3 45 ...
Page 128: ...Chapter 4 Replacement Procedures ...
Page 129: ...4 ii Libretto 50CT 70CT Maintenance Manual ...
Page 167: ...Appendices ...
Page 168: ...App ii Libretto 50CT 70CT Maintenance Manual ...
Page 178: ...Appendix B Board Layout B 4 Libretto 50CT 70CT Maintenance Manual ...
Page 183: ...Appendix C Pin Assignments Libretto 50CT 70CT Maintenance Manual C 5 ...
Page 186: ...Appendix Appendix C Pin Assignments C 8 Libretto 50CT 70CT Maintenance Manual 43 GND 44 NC ...
Page 194: ...Appendix F BIOS Rewrite Procedures F 2 Libretto 50CT 70CT Maintenance Manual ...
Page 196: ...Appendix G Reliability G 2 Libretto 50CT 70CT Maintenance Manual ...