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Power or Fan Failures,
6–4
Continued
3.
Power up the unit with the disk harness cables to the power
supply connected.
If the DC OK LED is off, this indicates the disk harness
is bad.
If the DC OK LED is on, power down the unit and
connect the regulator input cable to the power supply
(6–2).
4.
Power up the unit with the disk harness and regulator input
cables to the power supply connected.
If the DC OK LED is on, go to step 7.
If the DC OK LED is off, power down the unit and
disconnect the cables from connectors J2 and J3 on the
regulator module (6–1).
Power up the unit:
5.
If the DC OK LED is off, replace the regulator module.
If the DC OK LED is on, power down the unit and
reseat the connection between the system module and
I/O module.
Power up the unit:
6.
If the unit powers up correctly, the failure is corrected.
If the unit does not power up correctly, go to step 7.
7.
Power down the unit.
Connect the +5.1 V A cable to the power supply (6–2).
Power up the unit.
8.
If the DC OK LED is on, go to step 11.
If the DC OK LED is off, disconnect the 5.1 V A cable
from the system module.
9.
Power up the unit.
If the DC OK LED is on, replace the I/O module. If the
problem persists, replace the system module.
Continued on next page
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