IBM iSeries Series Hardware Problem Analysis And Isolation page 51

Note: Some system models have more than one mainline ac power cable or ac power jumper
cable. For these models, disconnect all the mainline ac power cables or ac power jumper
cables and measure the ac voltage at all ac power supply cables before answering the
following question.
Is the ac voltage from 180 V ac to 254 V ac 3 PH), 342 V ac to 440 V ac (3PH), 432 V ac to 508
V ac (3PH), 200 V ac to 240 V ac, or from 100 V ac to 127 V ac?
v Yes: Go to step 11 (See page 40).
v No: Continue with the next step.
6. Are you working on a power distribution unit with tripped breakers?
v No: Continue with the next step.
v Yes: Reset the tripped power distribution breaker, and go to the power problem procedure for
the unit that is connected to the tripped breaker.
This ends the procedure.
7. Does the system have an external uninterruptible power supply installed?
v Yes: Continue with the next step.
v No: Go to step 10 (See page 39).
8. Use a multimeter to measure the ac voltage at the external uninterruptible power supply outlets.
Is the ac voltage from 180 V ac to 254 V ac 3 PH), 342 V ac to 440 V ac (3PH), 432 V ac to 508
V ac (3PH), 200 V ac to 240 V ac, or from 100 V ac to 127 V ac?
v No: Continue with the next step.
v Yes: Exchange the ac power jumper cable - part as installed.
This ends the procedure.
9. DANGER
Dangerous voltage being measured. (RSFTD005)
Perform the following:
a. Disconnect the mainline ac power cables from the external uninterruptible power supply.
b. Use a multimeter to measure the ac voltage at the external uninterruptible power supply end of
the mainline ac power cables.
Is the ac voltage from 180 V ac to 254 V ac 3 PH), 342 V ac to 440 V ac (3PH), 432 V ac to 508
V ac (3PH), 200 V ac to 240 V ac, or from 100 V ac to 127 V ac?
v No: Continue with the next step.
v Yes: The uninterruptible power supply needs service: - For 9910 type UPS Call IBM Service
Support. For all other UPS call the UPS provider. Go to step 16 (See page 40) to verify system.
10. DANGER
Dangerous voltage being measured. (RSFTD005)
Perform the following:
a. Disconnect the mainline ac power cable from the customer's ac power outlet.
b. Use a multimeter to measure the ac voltage at the customer's ac power outlet.
Note: Some system models have more than one mainline ac power cable. For these models,
disconnect all the mainline ac power cables and measure the ac voltage at all ac power outlets
before answering the following question.
Is the ac voltage from 180 V ac to 254 V ac 3 PH), 342 V ac to 440 V ac (3PH), 432 V ac to 508
V ac (3PH), 200 V ac to 240 V ac, or from 100 V ac to 127 V ac? from 100 V ac to 127 V ac?
v Yes: Exchange the mainline ac power cable. Then, go to step 2 (See page 38).
Analyze hardware problems
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