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HP 88780 Front Load Tape Drive
Options 680 / 682 / 683 / 684
Read/Write/Format Board 370-1276
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Drive Controller Board 370-1277
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Single Ended I/O Board 811-1241
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Data Buffer Board 370-1279
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NVRAM Reset Procedure
- Load a scratch tape.
- Run TEST 150 to write a GCR ID to the scratch tape.
- Run TEST 128 to store the NVRAM contents to the scratch tape.
- Remove Power.
- Install the new Data Buffer Board or new EPROMs.
- Connect a jumper between locations GND and CLRNV.
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- Apply power. FAIL--0 is displayed when selftest is complete.
- Remove Power.
- Remove the jumper.
- Apply Power.
- Load the scratch tape.
- Run TEST 129 to load NVRAM with the contents stored on tape.
- Rewind to BOT.
- Run TEST 99 to calibrate the read channel gain values.
Battery Notes
- The battery part number is 150-1204-01 or 811-1232-01.
- The battery is not replaceable on boards built after January 1990.
Reference
- Sun Front-Load 1/2-Inch Tape Drive Field Service Manual,800-3447.
Last updated: December 2, 1996
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