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Troubleshooting

IX%5tXM+

*vice

Manual

Table 5-5. C117

PSB/PSE

Board Assembly Component Repair (continued)

Symptom

The

+35

VDC line is

dead.

.

Cause

The main switching

FETs

(Q101

or

Q201

) are defective.

QI02 or

Q201

is

defective.

Q103

or

Q203

is

defective.

Checkpoint

Check

the

voltage waveform between

the drain side and

GND.

r

I i

I

1

L

I

I

I

I

1

I

1 1 1

[

1

I

1

1

Observe the voltage waveform

between the collector side and

GND.

I

I

1

I

I

I.+

I

LIV14YW

w

1

1

1

L?w

A

Check the voltage waveform between

the collector side and

GND.

I

I

I

I

+

I

MV14W

I

I

I

I

WY

*.2LS

I

ATI.O.OU$

I

Solution

Replace

Q101

or

Q201

.

Replace

Q101

or

Q201.

%@aca

2103

or

2203.

c)

.,

.*,,..

.,.

<

. .

.

5-14

Rev.

A