Sharp R-343GM, Service Manual

Page: 7 / 24

R343M - 7
To protect the electronic circuits, this model is provided with a fine foil pattern added to the input circuit 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 OCCURRENCE CAUSE OR CORRECTION
1 The rated voltage is not applied between Pin Check supply voltage and oven power cord.
No. 5 of the 3 pin connector (A) and the
common terminal of the relay RY2.
2 Only pattern at "a" is broken. *Insert jumper wire J1 and solder.
3 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. If
any abnormal condition is detected, replace the defective parts.
TEST PROCEDURES (CONT'D)
PROCEDURE
LETTER
COMPONENT TEST
D PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING BOARD
(PWB) IS OPEN
1 5
RY2
(J1)
a
d
c
b
CN-A
RY1
D1
VRS1
D71
ZD71