MAP 0390: Supervisor Power Problem
014 (continued)
Is this the first time at this step?
Yes No
015
– Go to Step 051 on page 1-236.
016
– Go to Step 033 on page 1-233 to continue fault isolation.
017
DANGER
High voltage present at test points. Use high voltage test probes.
– Open the service access cover of the high-voltage transformer.
– Using a multimeter, check ac phase-to-phase voltage between test points H0 and H1 on the high-
voltage transformer.
Is ac present and within 340-440 V ac?
Yes No
018
– Put both circuit breakers of high-voltage transformer in the Off (‘0’) position.
– Have customer put his wall circuit breaker in the On position.
Does the customer circuit breaker stay in the On position?
Yes No
019
DANGER
High voltage present. Perform “Lockout/Tagout Procedure for PDU” on page 1-2
or “Lockout/Bagout Procedure for PDU” on page 1-3 to remove primary power
to the frame (and high-voltage transformer, if present).
– Replace the ac power cord connecting the high-voltage transformer to the customer's
power.
– Go to Step 049 on page 1-236 to verify fix.
020
DANGER
High voltage present at test points. Use high voltage test probes.
– Put input circuit breaker of the high-voltage transformer in the On (‘1’) position.
– Using a multimeter, check ac phase-to-phase voltage between test points H0 and H1 on the high-
voltage transformer.
(Step 020 continues)
Chapter 1. Maintenance Analysis Procedures (MAPs)
1-231
Summary of Contents for RS/6000 SP
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