Philips 32PFL3505D/F7 Wartungshandbuch PDF herunterladen (Seite 28)

8-1 PL10.3TR

TROUBLESHOOTING

[ Power Supply Section ]

The power cannot be turned on.

The fuse blows out.

FLOW CHART NO.1

FLOW CHART NO.2

Is normal state restored when once unplugged

power cord is plugged again several seconds?

Check if there is any leak or short-circuiting on the

primary circuit component, and service it if defective.

(C605, D601, D602, D603, D604, Q601, Q602,

Q603, Q604, IC602, T601)

Ye s

Is the fuse (F601) normal?

See FLOW CHART No.2 <The fuse blows out.>

Ye s

Is the AL+33V line voltage normal?

Check each rectifying circuit of the secondary

circuit and service it if de

fective.

Check the presence that the primary component

is leaking or shorted and service it if defective.

Check the presence that the rectifying diode or circuit

is shorted in each rectifying circuit of secondary side,

and service it if defective.

After servicing, replace the fuse.

When the output voltage fluctuates.

FLOW CHART NO.3

Does the photocoupler circuit on

the

secondary side operate normally?

Ye s

Check IC601, D639, D652, D653, Q631 and their

periphery circuit, and service it if defective.

When buzz sound can be heard in the vicinity of power circuit.

FLOW CHART NO.4

Check if there is any short-circuit on the rectifying diode and the circuit

in each rec

tifying circuit of the secondary side,

and service it if def

ective. (IC631, Q207, Q209, Q210, Q211, Q501, Q635, Q636, Q637, Q640, Q641, Q64

2, Q643,

D631, D632, D633, D638, D641, D642, D646, D647)

Check D657, R661 and their periphery circuit, and

service it if de

fective.

AL+33V is not output.

FLOW CHART NO.5

Is approximately +34V voltage supplied to the

cathode of D638?

Ye s

Check C638, D638, D639 and their periphery

circuit, and service it if defective.

Check IC601, D

615, D616, IC602 and their periphery,

circuit and service it if defective.

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