Step 3
(from Step 2)
1. Start with the farthest circuit breaker to the left in the power distribution panel
(typically the 50-amp circuit breaker for the CPU enclosure in position A1 of the
power distribution panel). Set the circuit breaker switch to the Off position.
2. Plug the power cord for this circuit breaker into the correct device or drawer.
3. Set the circuit breaker switch to the On position.
4. Measure for -40 to -60 V dc on terminal board 2 (TB2) between positions one
and two (side A circuit breakers) and between positions five and six (side B
circuit breakers).
Is the voltage between -40 and -60 V dc?
NO Move to the next circuit breaker to the right, and repeat this step until all
of the power cords are reconnected to the correct devices or drawers.
Once all power cords from the power distribution panel to the devices and
drawers are reconnected, go to Step 4.
YES To test each FRU, exchange the FRUs in the following order:
CAUTION:
Energy hazard, remove power before servicing. Disconnect two
power supply cords.
1.
The last circuit breaker set to on.
For information about removing
circuit breakers, refer to the “Circuit Breaker” removal and
replacement procedure beginning on page 4-17.
2.
The -48 V DC power supply for the device or drawer connected to the
last circuit breaker turned on.
For information about removing the
power supply, refer to the service guide for the device or drawer
connected to this circuit breaker.
If the symptom did not change and all the FRUs are exchanged, go to
"MAP 1520 -- Power MAP" in the service guide for the device or drawer
connected to this circuit breaker.
Go to Step 5.
5-6 7014 Model S00 Rack Installation and Service Guide
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