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TB8100 Service Manual Power Management Unit Fault Finding 215

13 Power Management Unit Fault Finding

This chapter provides enough fault finding information to allow you to trace

the fault to an individual board or card in the PMU. It does not provide any

information to allow fault finding down to component level. If the fault is

traced to the auxiliary power supply board or a plug-in card, the standard

procedure is to discard the faulty item and fit a new one. However, if the

fault is traced to the DC converter board or AC converter board, you must

replace the complete DC or AC module.

The fault finding procedures provided in this chapter assume you are familiar

with the operation of the TB8100 Service Kit and Calibration Kit.

Figure 13.1 on page 218 identifies the individual boards and cards, and

shows how they are configured in an AC and DC PMU. “Identifying the

PMU” on page 217 explains how to identify the model and hardware

configuration of a PMU from its product code.

Note For the sake of simplicity and clarity, the instructions and illustra-

tions in this chapter refer to an AC and 12 V DC PMU fitted with

an auxiliary power supply board. However, the same basic proce-

dures and techniques apply to other models of PMU.

Tait TB8100 Service Manual

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