IBM T00 Service Manual page 32

Step 1520-13
Set all of the circuit breaker switches on the power distribution panel to the on position.
Do all the power supplies on the devices have power?
NO Go to "Step 1520-14."
Go to "MAP 0410: Repair Checkout" in the Diagnostic Information for Multiple Bus Systems.
YES
Step 1520-14
1. Ensure that the circuit breaker is in the on position.
2. Using a multimeter, attach the black multimeter cable lead to the return bus bar (+), and then attach
the red multimeter cable lead to the bottom terminal on the circuit breaker.
3. Measure for -40 to -60 V dc between the -48 V dc circuit breaker and the return bus bar (lower bar) in
the power distribution panel.
Is the voltage between -40 and -60 V dc?
Replace the circuit breaker. Then go to "MAP 0410: Repair Checkout" in the Diagnostic
NO
Information for Multiple Bus Systems.
YES Go to "Step 1520-15."
Step 1520-15
Has the device power supply previously been replaced?
Replace the power supply. Then go to "MAP 0410: Repair Checkout" in the Diagnostic Information
NO
for Multiple Bus Systems.
Replace the cable. Then go to "MAP 0410: Repair Checkout" in the Diagnostic Information for
YES
Multiple Bus Systems.
20
7014 Model T00, and Model T42 Service Guide