IBM 9332 Service Manual page 81

Disk unit
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Verifying a Good Fix
Warning:
When you power on the 9332, the system
must be powered on in order for the 9332 power-on
diagnostics to work correctly. If the system is not
powered on, the results of the diagnostics can indicate
that the 9332 is not OK.
A fix is verified when the following items are completed:
The 9332 powered on normally.
The following is a normal power-on sequence for the
9332:
1. The unit is powered on.
2. The Power Ready light starts to flash immediately.
The Unit Ready light remains off.
3. After 2 to 4 seconds, the Power Ready light comes
on continuously and the Unit Ready light starts to
flash.
4. After 60 to 90 seconds (maximum of 2 minutes if a
reallocate is in process), the Unit Ready light
comes on continuously. If after 90 seconds both the
Power Ready light and the Unit Ready light are on
continuously, the 9332 has completed power-on
diagnostic tests and can now perform read and
write operations.
Note: If the 9332 does not power on normally (both
Power Ready and Unit Ready lights on
continuously), go to "Starting Problem Analysis" in
the Analyzing Problems manual to analyze the
problem indicated by the lights.
No system reference codes (SRCs) were indicated at
the system after the 9332 powered on.
System utilities have been run verifying that the
system can communicate with the 9332 (no SRCs
returned).
Problem recovery procedures, if specified, for the
problem you are working on have been performed.
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