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R-230F
PROCEDURE
LETTER
D
HIGH VOLTAGE CAPACITOR TEST
CARRY OUT 3D CHECKS.
A. Isolate the high voltage capacitor from the circuit.
B. Continuity check must be carried out with measuring instrument which is set to the highest
resistance range.
C. A normal capacitor shows continuity for a short time (kick) and then a resistance of about 10MΩ
after it has been charged.
D. A short-circuited capacitor shows continuity all the time.
E. An open capacitor constantly shows a resistance about 10 MΩ because of its internal 10MΩ
resistance.
F. When the internal wire is opened in the high voltage capacitor shows an infinite resistance.
G. The resistance across all the terminals and the chassis must be infinite when the capacitor is
normal.
If incorrect reading are obtained, the high voltage capacitor must be replaced.
CARRY OUT 4R CHECKS.
E
SWITCH TEST
Isolate the switch to be tested and using an ohmmeter check between the terminals as described in
the following table.
CARRY OUT 3D CHECKS.
If incorrect readings are obtained, make the necessary switch adjustment or replace the switch.
CARRY OUT 4R CHECKS.
F
TEMPERATURE FUSE TEST
CARRY OUT 3D CHECKS.
Disconnect the leads from the terminals of the temperature fuse. Then using an ohmmeter, make a
continuity test across the two terminals as described in the below.
Parts Name
Temperature fuse 120˚C
If incorrect readings are obtained, replace the temperature fuse.
An open circuit temperature fuse (OVEN) indicates that the food in the oven cavity may catch fire,
this may be due to overheating produced by improper setting of the cooking time or failure of the
control panel.
CARRY OUT 4R CHECKS.
G
MOTOR WINDING TEST
CARRY OUT 3D CHECKS.
Disconnect the leads from the motor. Using an ohmmeter, check the resistance between the two
terminals as described in the table below.
If incorrect readings are obtained, replace the motor.
TEST PROCEDURES
Table: Terminal Connection of Switch
Plunger Operation
COM to NO
Released
O.C.
Depressed
S.C.
Temperature of "ON"
condition (closed circuit).
This is not resetable type.
Table: Resistance of Motor
Motors
Fan motor
Turntable motor
COMPONENT TEST
COM to NC
S.C.
O.C.
Temperature Fuse Test
Table:
Temperature of "OFF"
condition (open circuit).
Above 120˚C
Resistance
Approximately 400 ohms
Approximately 12 kohms
CARRY OUT 4R CHECKS.
10
COM; Common terminal,
NO;
Normally open terminal
NC;
Normally close terminal
S.C.; Short circuit
O.C.; Open circuit
Indication of ohmmeter (When room
temperature is approx. 20˚C.)
Closed circuit
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