R-3A88
13
TEST PROCEDURES (CONT'D)
PROCEDURE
LETTER
COMPONENT TEST
RELAY SYMBOL OPERATIONAL VOLTAGE CONNECTED COMPONENTS
RY1 APPROX. 25.0V D.C. Oven lamp / Turntable motor / Cooling fan motor
RY2 APPROX. 25.0V D.C. Power transformer
CARRY OUT 4R CHECKS.
N 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.
CARRY OUT 3D CHECKS.
STEPS OCCURANCE CAUSE OR CORRECTION
1 The rated AC voltage is not present at Check supply voltage and oven power cord.
POWER terminal of CPU connector (CN-A).
2 The rated AC voltage is present at primary Low voltage transformer or secondary circuit defective.
side of low voltage transformer. Check and repair.
3 Only pattern at "a" is broken. *Insert jumper wire J1 and solder.
(CARRY OUT
3D CHECKS BEFORE REPAIR)
4 Pattern at "a" and "b" are broken. *Insert the coil RCILF2003YAZZ between "c" and "d".
(CARRY OUT
3D CHECKS BEFORE REPAIR)
NOTE: *At the time of making these repairs,
make a visual inspection of the varistor.
check for burned damage and examine
the transformer with a tester for the pres-
ence of layer short-circuit (check primary
coil resistance). If any abnormal condi-
tion is detected, replace the defective
parts.
CARRY OUT
4R CHECKS.
36
VRS1
(J1)
(J2)
5
CN-A
1
a
b
c
d
LOT NO.
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