For Hp 7925H - HP 7925D Service Manual

PART II - MAINTENANCE
In general, the maintenance information contained in sec-
tion II of the main manual is applicable to the HP 7925H.
The only changes required pertain to the description of the
special test equipment (paragraph 2-7) and the preventive
maintenance schedule (paragraph 2-10). These changes
are described in the following paragraphs.
A-72. SPECIAL TEST EQUIPMENT
The Disc Service Unit (DSU) described in section II of the
main manual is the only item of special test equipment
required to service the HP 7925H Disc Drive. However,
operation of the DSU with the HP 7925H requires the use
of the following additional item of equipment.
• I/O Sector PCA, part no. 07925-60001. (See figure
A-l1.)
Instructions for installing the DSU in the HP 7925H are
provided in part III of this appendix.
It should be noted that the controller's self-test feature is
deactivated when the DSU is installed in the HP 7925H-
disc drive faults are identified solely by eight light-
emitting diodes (LED's) located on the disc drive control
panel and three LED's on spindle logic PCA-AB. Interpre-
Figure A-II. I/O Sector PCA, part no. 07925-60001
tation ofthis readout is described in section IV of the main
manual.
A-73. PREVENTIVE MAINTENANCE
For HP 7925H usage, the following information should be
added to table 2-3 in the main manual.
ITEM ROUTINE
Card Cage Assembly Fan Inspect for proper operation.
A-33/A-34