19
R-22AM
R-23AM
R-23AT
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 OCCURRENCE 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 J24 and solder for R-23AT.
*Insert jumper wire J9 and solder for R-23AM / R-22AM.
(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 these repairs, make a visual inspection 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.
CARRY OUT 4R CHECKS.
R-23AT R-23AM / R-22AM
RELAY SYMBOL OPERATIONAL VOLTAGE CONNECTED COMPONENTS
RY1 APPROX. 18.0V D.C. Oven lamp, Blower motor and Stirrer motors
RY2 APPROX. 17.5V D.C.
High voltage transformer 1
RY3 APPROX. 17.5V D.C.
High voltage transformer 2
CARRY OUT 4R CHECKS.
TEST PROCEDURES
PROCEDURE
LETTER COMPONENT TEST
R PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING
BOARD(PWB) IS OPEN
(J29)
(VRS2)
VRS1
(J24)
(J23)
(9)9(7)5(3)3(1)
RY1
D81
c
a
b
d
S1
S2
23
P
TI
C31
D23
+
–
VRS1
(J9)
(J8)
OL, BM POWER
7531
D21
CN–A
a
c
b
d
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