025
You may have an intermittent problem:
Check for damaged cables or connectors.
Reseat all adapters and devices in the 3550
Expansion Unit.
Start an error log and run the tests several times.
Check the power supply fan in the 3550 Expansion
Unit and make sure it is working properly.
Check the power supply voltages (see “Power
Systems Checkout”).
Power Systems Checkout
If the “power good” light is not on and if the power-supply
fan is not running, check the power cord for continuity and
proper installation.
If the power cord is not the problem, either the power
supply is defective or another component is defective and
is causing the power supply to shut off. To verify that the
power supply is operating correctly, do the following:
1. Power-off the 3550 Expansion Unit and disconnect
the 3550 Expansion Unit power cord.
2. Remove all power supply connectors (power supply
connector P1, P2 and drive connector 1) from the
system board of the 3550 Expansion Unit and SCSI
device.
3. On power supply connector P2, short-circuit pin 4 to
pin 6 and short-circuit pin 7 to 8.
4. Connect the 3550 Expansion Unit power cord.
5. Check the power supply voltages using the figures on
the next page.
Expansion Unit (3550)
327
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