Digital Equipment DEC 3000 500X AXP Service Information page 37

Power or Fan Failures,
Continued

If the DC OK LED is off, replace the 5.1V A cable. When
you replace the cable, connect both ends.
10. Power up the unit.

If the unit powers up correctly, the failure is corrected.

If the unit does not powered up correctly, go to step 11.
11. Power up the unit.

Connect the +5.1 V B cable to the power supply (6–2).
12. Power up the unit.

If the DC OK LED is on and the unit powers up
correctly, no problem found.

If the DC OK LED is off, disconnect the +5.1 B cable
from the system module.
13. Power up the unit:

If the DC OK LED is off, replace the +5.1 B cable. When
you replace the cable, connect both ends.

If the DC OK LED is on and the unit powers up
correctly, no problem found.
Continued on next page
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