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1-10 General Information
Self-Test
During installation you may wish to check the electrical performance of the drive. The drive
can be checked with or without a disc installed. To conduct the self-test, follow this proce-
dure:
1. Remove the front cover of the 9895A, thereby exposing two toggle switches and an
LED display on the front edge of the controller (see Figure 1-4).
2. Press and release the right-hand toggle switch. The LED's should now start blinking,
indicating that the self-test routine has begun.
3. The routine should terminate with only the right-most LED lit. Any other result indi-
cates a failure. Try running the self-test several times to verify pass or failure. This
self-test verifies operation of:
a. HP-IB interface chip (PHI),
b. Read-only memory,
c. Z80 processor,
d. Random access memory,
e. Serializer / deserializer,
f. Encoder,
g. Decoder,
h. Stepping circuit and mechanism,
i.
Rotational timing (if disc installed).
If the drive fails self-test, turn to the troubleshooting section of Chapter 3.
A more elaborate test, the read/write self-test, is run using the following procedure:
1. Install a write enabled, formatted, scratch disc in each drive.
2. Press and hold the left-hand switch.
3. While holding the left-hand switch, press and release the right-hand switch.
4. Release the left-hand switch. Read/write self-test should now start.
This routine writes on the disc and then reads back, comparing what it read with what it
wrote. It checks the read/write circuitry and the CRC generator / checker, as well as every-
thing checked by the previous routine.
A final check, the read-only self-test, may be run using the following procedure:
1. Install a formatted scratch disc in all drives.
2. Press and hold the right-hand switch.
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