Magnavox 26MF301B Manuel de service télécharger pdf (Page 22)

8-1 FL11.3TR

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, C606, 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+35V line voltage normal?

Check each rectifying circuit of the secondary circuit

and service it if defective.

Check the presence that the primary component is

leaking or shorted and service it if de

fective.

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 secondar

y side

operate normally?

Ye s

Check IC601, D652, 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, Q209, Q210, Q211, Q213, Q635, Q636, Q637, Q640, Q641, Q

642, Q643,

D631, D632, D633, D634, D636, D638, D641, D642, D646, D647)

Check if there is

any leak or short-circuit onthe loaded

circuit, and service it if def

ective.

INV+35V is not output.

FLOW CHART NO.5

Is approximately +32V voltage supplied to the cathode

of D636?

Ye s

Check C638, D634, D636, D639 and their periphery

circuit, and service it if defective.

Check IC601, D

609, D611 and their periphery,

circuit and service it if defective.

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Magnavox 26MF301B Manuel de service Page 22

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