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7925
A-84. VISUAL INDICTION OF
DRIVE STATUS
The information given in the main manual for visual
indication of drive status (table 4-1) is applicable to the
HP 7925H, with the exception of the listing of applicable
functional diagrams and the data presented for the Unit
Select Identification indicator. The revised data for the
Unit Select Identification indicator is given in table A-lO.
The revised functional diagrams listed in paragraph A-86
should be used with table 4-1 in the main manual.
A-8S. DISC SERVICE UNIT
The disc service unit (DSU) installation instructions given
in section III of the main manual do not apply to the HP
7925H. Refer to part III of this appendix for DSU installa-
tion instructions applicable to the HP 7925H.
A-86. SYSTEM FUNCTIONAL DIAGRAMS
The following diagrams have been revised for use with the
HP 7925H and replace figures 4-23 through 4-29, respec-
tively, in the main manual.
•
Figure A-15. HP 7925H Mainframe Assembly,
Wiring Diagram
•
Figure A-16. HP 7925H Operation Control System,
Functional Diagram
•
Figure A-17. HP 7925H Spindle Rotating System,
Functional Diagram
•
Figure A-18. HP 7925H Head Positioning System,
Functional Diagram
•
Figure A-19. HP 7925H Sector Sensing System,
Functional Diagram
Appendix A
•
Figure A-20. HP 7925H Read/Write System,
Functional Diagram
•
Figure A-2I. HP 7925H Fault Detection System,
Functional Diagram
A functional diagram of the integrated controller is pro-
vided in figure A-14. In addition, the following table has
been revised for use with the HP 7925H and replaces table
4-4 in the main manual:
•
Table A-II. HP 7925H Motherboard PCA-A7
Signal Distribution List
A-87. WIRING CONNECTIONS
The following information, revised for HP 7925H usage,
replaces figure 4-23 and table 4-4, respectively, in the
main manual:
•
Figure A-15. HP 7925H Mainframe Assembly,
Wiring Diagram
•
Table A-II. HP 7925H Motherboard PCA-A7
Signal Distribution List
Note:
Th.e HP l30l3D Multi-Unit Cable and
the HP l32l3D Data Cable listed in the
main manual are not used with the HP
7925H.
A-88. POWER DISTRIBUTION
The following table is revised for use with the HP 7925H
and replaces table 4-5 in the main manual:
•
Table A-12. HP 7925H Power Distribution List
A·39
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