DS8000 Service Documentation Version 7.5

MAP20A0 Protected 208 VDC is Off

The protected 208 VDC output is off. Either one of the sequencer module S0, S1, or S2 enable/disable switches is set to disable or the PPS has a failure.

MAP20A0 Section-1

Procedure

Determine the location of the failing Primary Power Supply (PPS) by using the location code listed in the problem FRU list.
Observe the S0, S1, and S2 LEDs 2 on the sequencer module, see Figure 1. Find the condition that applies:
- An LED is amber, go to step 3.
- All LEDs are green, the failure is not occurring now so this MAP will not be able to isolate it. Exit this MAP and close the problem.
Figure 1. PPS sequencer module and LED enable/disable switch
Observe the S0, S1, and S2 enable/disable switches 1 on the sequencer module of the PPS FRU. Is a switch in the disable position?
- Yes, set the switch to the enable position. Return to the repair process screen and do a pseudo repair (see Note) of the next FRU in the list. This will run verification tests to ensure the repair is successful.
  Note: A pseudo repair means you use the normal procedures to replace the FRU, but do not exchange the original FRU with a new FRU. You must still power off and disconnect the cables when directed. Do not remove or replace the FRU. Connect and power on the FRU when guided. This ensures the error conditions are properly reset and all verification tests, including the FRU power-on self test, are correctly run.
- No, return to the repair process screen and continue the repair by selecting the next FRU on the list.