HP 7942 Service Manual page 125

APPENDIX
A-1 BACKDAtiNG INFORMATION
-
[ !J
This backdating appendix provides removal and replacement and replaceable parts information for HP 7942
and HP 7946 Disc/Tape Drives with serial numbers prefixed 2605 and prior and 2614 and prior. Dis-
c/Tape Drives with serial number prefixed 2605 and prior use a different front panel and a different LED
cable (W4). Disc/Tape Drives with serial number prefix 2614 and prior use a different tape drive assembly
and a different cable (W6).
UPDATE DESCRIPTION
Section!i V and VI in this backdating supplement should be used in place of Sections V and VI in the
main manual for HP 7942 and HP 7946 Disc/Tape Drives with serial numbers prefixed 2605 and
prior. Use Sectibns III and IV in the main manual for theory of operation and service information
for HP 7942 and HP 7946 Disc Drives with serial numbers prefixed 2'605 and prior.
If it is desired to upgrade the old LED cable (07942-60033) to the new LED cable (07941-60003)
the front panel assembly (07942-60106, 07946-60016) must be replaced with the new front panel
assembly (07942-60116,-7946-60116).
2 SectioIl!i V and VI in this backdating supplement should be used in place of Sections V and VI in the
main ITlanual for HP 7942 and HP 7946 Disc/Tape Drives with serial numbers prefixed 2614 and
prior. Use Sections III and IV in the main manual for theory of operation and service information
for HP 7942 and HP 7946 Disc Drives with serial numbers prefixed 2614 and prior.
If it is desired to upgrade the tape drive assembly (09144-60601) to the new tape drive assembly
(09144-63101) it is necessary to replace cable assembly W6 (07942-60014) with cable assembly W6
(07942-60030).
A-l/A-2