Sharp R-961 (W) - Page 24

TEST PROCEDURES
PROCEDURE
LETTER
oO
COMPONENT TEST
RELAY TEST
CARRY OUT 3D CHECKS.
Remove the outer case and check voitage between Pin Nos. 1 and 3 of the 4 pin connector (E) on the
control unit with an A.C. voltmeter.
The meter should indicate 230 volts, if not check oven circuit.
Relay Test
Check voitage at the relay coil with a D.C. voltmeter during the microwave cooking operation. convection
cooking operation or grill operation.
DC. voltage indicated............. Defective relay.
DC. voltage not indicated....... Check diode which is connected to the relay coil. If diode is good, control
unit is defective.
8
Approx. 24.0V D.C. Damper motor
Approx. 24.0V D.C Rotisserie motor
CARRY OUT 4R CHECKS.
ROCED KEN WH FOIL PATTE N THE PRIN BOA
(PWB) IS OPEN.
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.
CARRY OUT 3D CHECKS.
re tere |
Power terminal of CPU connector (CN-A).
side of low voltage transformer. Check and repair.
oe *Insert jumper wire J1 and solder.
CARRY OUT 3D CHECKS BEFORE REPAIR
Pattern at “a" and "b" are broken. *Insert the coil RCILF2003YAZZ between"c" and "d".
(CARRY OUT 3D CHECKS BEFORE REP AIR)
NOTE: *At the time of these repairs, make a
visual inspection ofthe varistor for burn-
ing damage and examine the trans-
former 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-961 - 22