R-SHIO
TEST PROCEDURES (CONT’D)
PROCEDURE
LETTER COMPONENT TEST
P 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 serves as a substitute coil. If the foil pattern is open, follow
the troubleshooting guide given below for repair.
Problem: POWER ON, indicator does not light up.
STEPS OCCURANCE CAUSE OR CORRECTION
1 The rated voltage is not applied to POWER terminal Check supply voltage and oven power cord.
of CPU connector (CN-A)
2 The rated voltage is-applied to primary side of power Power transformer or secondary circuit defective.
transformer. Check and reuair.
3 Only pattern at “a” is broken. ‘Insert jumper wire 1 and solder.
4
Pattern at “a” and “b” are broken. ‘insert the coil RCILF2003YAZZ between “c” and
I’d”.
NOTE:’ At the time of these repairs, make 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.
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