Magnavox 19MF301B Service Manual download pdf (Page 37)

8-6 FL11.0BTR

[TYPE B]

[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 after several seconds?

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

primary circuit component, and service it if defective.

(D601, D602, D603, D604, Q601, Q602, T601)

Ye s

Is the fuse (F601) normal?

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

Ye s

Is the INV+31V 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 defec

tive.

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, D633, 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 defec

tive. (IC631, Q201, Q205, Q206, Q634, Q635, Q636

, Q637, Q640, Q641, Q64

3, D631, D632, D636,

D638, D639, D641, D643)

Check if there is any leak or short-circuit on the loaded

circuit, and service it if defective.

INV+31V is not output.

FLOW CHART NO.5

Is approximately +31V voltage supplied to the

cathode of D632?

Ye s

Check C632, D632, D633 and their periphery

circuit, and service it if defective.

Check IC601, D

608, D610 and their periphery circuit,

and service it if de

fective.

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Magnavox 19MF301B Service Manual Page 37

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