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Table 5-4. Repairing the BOARD ASSEMBLY, C076

PSB/PSE

(Continued)

Problem

The voltage of the

+35 V line is below

thespecifiedvalue.

Cause

Q3,

ICI,

Pcl,

PC2

Q2

is dead.

Checkpoint

Check the voltage waveforms at

Q3.

.

,

CH1=O.2V

TlME=2~s

Check the voltage waveforms at

Q2.

I

I

H

I

CH1=2V

1 1 1

I

Solution

Replace

D3,

Icl,

Pcl,

PC2

ZD51.

or

Replace

Q2.

.

.

.

.