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Briefly Disable the Shutdown Circuitry

In this step, you shutdown the protective circuitry for a short time, and the

supplies are forced on (including shorted supplies) with a 100% duty cycle.

Caution

Damage to components or to circuit traces may occur if

A8TP4

(SDIS) is shorted to chassis ground for more than a few seconds

while supplies are shorted.

1. Connect

A8TP4

(SDIS) to chassis ground with a jumper

wire.

Switch on the analyzer and note the

signal

mnemonics and test points of any

LEDs

that are

off. Immediately

resow

the

jumper

wire.

3. Refer to the block diagram

(Figure

5-8) at the end of this chapter and do the

foIIowing:

Note the mnemonics of any additional signals that may connect to any

test point that showed a

fault

in the previous step.

Cross reference

alI

assemblies that use the power supplies whose

LEDs

went out when

A8TP4

(SDIS) was connected to chassis ground.

5-16 Power Supply Troubleshooting

HP 8753E Service Manual

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