HP 88780 Front Load Tape Drive

Options 680 / 682 / 683 / 684

Read/Write/Format Board
370-1276

Drive Controller Board
370-1277

Single Ended I/O Board
811-1241

Data Buffer Board
370-1279

1. Load a scratch tape.
2. Run TEST 150 to write a GCR ID to the scratch tape.
3. Run TEST 128 to store the NVRAM contents to the scratch tape.
4. Remove Power.
5. Install the new Data Buffer Board or new EPROMs.
6. Connect a jumper between locations GND and CLRNV.
   
   
7. Apply power. FAIL--0 is displayed when selftest is complete.
8. Remove Power.
9. Remove the jumper.
10. Apply Power.
11. Load the scratch tape.
12. Run TEST 129 to load NVRAM with the contents stored on tape.
13. Rewind to BOT.
14. Run TEST 99 to calibrate the read channel gain values.

Battery Notes

1. The battery part number is 150-1204-01 or 811-1232-01.
2. 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.