Sharp Carousel R-312AK Service-Handbuch - Seite 16

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R-312AW

R-312AK

PROCEDURE

LETTER

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 troubleshooting

guide given below for repair.

Problem: POWER ON, indicator does not light up.

STEPS

NOTE: *At the time of making these repairs,

TEST PROCEDURES

OCCURRENCE

The rated AC voltage is not present between

Pin No. 3 of the 2-pin connector (A) and the

common terminal of the relay RY2.

The rated AC voltage is present at primary

side of low voltage transformer.

Only pattern at "a" is broken.

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

make a visual inspection of the varistor.

Check for burned damage and examine

the transformer with a tester for the

presence of layer short-circuit (check

the primary coil resistance which is ap-

proximately 563

10%). If any abnor-

mal condition is detected, replace the

defective parts.

COMPONENT TEST

CAUSE OR CORRECTION

Check supply voltage and oven power cord.

Low voltage transformer or secondary circuit defective.

Check and repair.

*Insert jumper wire J1 and solder.

*Insert the coil RCILF2003YAZZ between "c" and "d".

(J1)