Sharp R-231F Service Manual

R-231F
13
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
The rated voltage is not applied between Pin
1 No. 3 of the 2 pin connector (A) and the Check supply voltage and oven power cord.
normal open terminal of the relay RY2.
2
The rated voltage is applied to primary side Low voltage transformer or secondary circuit defective.
of low voltage transformer. Check and replace control unit.
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 exam-
ine the transformer with tester for the
presence of layer short-circuit (check
primary coil resistance). If any abnor-
mal condition is detected, replace the
defective parts.
CARRY OUT 4R CHECKS.
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
N PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING
BOARD (PWB) IS OPEN
CN-A
J1
a
b
c
d
RY1
VRS1
1
3

Sharp R-231F Specifications

Power

AC power required	1.21 kW
output power	800 W
microwave frequency	2450 MHz

Weight and Dimensions

outside width	460 mm
outside height	275 mm
outside depth	353 mm
cavity width	322 mm
cavity height	212 mm
cavity depth	336 mm
weight	12 kg