HP 8711B Service Manual page 97

If the disk drive light does not illuminate:
If there is no CRT display:
If the VIDEO OUT signal appears good:
If the VIDEO OUT signal appears bad:
To con rm video circuitry problems:
If an error occurs while rmware is being loaded (after 2 beeps are heard):
Load firmware?
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If a self-test fails:
4-8 T roubleshooting and Block Diagrams