Sharp Carousel II R-3A54 Manual de serviço - Página 16

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R-3A54

R-3E54

TEST PROCEDURES

(CONT'D)

PROCEDURE

LETTER

COMPONENT

TEST

PROCEDURES

TO BE TAKEN

WHEN

THE FOIL PATTERN

ON THE PRINTED

WIRING

BOARD

(PWB)

IS OPEN.

To protect the electronic circuits, this model is provided with a fine foil pattern added to the

primary on the PWB, this foil pattern acts as a fuse. If the foil pattern is open, follow the trou-

bleshooting guide given below for repair.

Problem: POWER ON, indicator does not light up.

/STEPS I

OCCURANCE

CAUSE OR CORRECTION

1 '

1 The rated AC voltage is not present at POWER ter-

Check supply voltage and oven power cord.

Please

j minal of CPU connector (CN-A)

use term "Low voltage transformer" when refering to

transformer Tl

1 The rated AC voltage is present at primary side of low

Low voltage transformer or secondary circuit defec-

i voltage transformer.

tive. Check and repair.

Only pattern at "a" is broken.

"Insert jumper wire Jl and solder.

Pattern at "a" and "b" are broken.

'Insert the coil RCILF2003YAZZ

between "c" and

"d".

NOTE:' At the time of these repairs, make a visual in-

spection of the varistor for burning damage

and examine the transformer with tester for the

presence of layer short-circuit (check primary

coil resistance).

If any abnormal condition is detected, replace

the defective parts.