R-950A
18
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
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.
Q
PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING BOARD
(PWB) IS OPEN
STEPS
OCCURRENCE
CAUSE OR CORRECTION
1
The rated voltage is not applied between Pin
Check supply voltage and oven power cord.
No. 7 of the 4-pin connector (A) and the
common terminal of the relay RY1.
2
The rated voltage is applied to primary
Power transformer or secondary circuit defective.
side of power transformer.
Check and repair.
3
Only pattern at "a" is broken.
*Insert jumper wire J1 and solder.
4
Pattern at "a" and "b" are broken.
*Insert the coil RCILF2003YAZZ between "c" and "d".
NOTE: *At the time of making these repairs,
make a visual inspection of the varistor.
check for burned damage and examine
the transformer with an ohmmeter for
the presence of layer short-circuit
(check primary coil resistance). If any
abnormal condition is detected, replace
the defective parts.
RY6
a
b
c
d
3
T1
CN - A
34
VRS1
7
