R-3A55
TEST PROCEDURES
PROCEDURE
LElTER
COMPONENT TEST
F THERMAL CUT-OUT TEST
CARRY OUT 3fJ CHECKS
Disconnect the leads from the terminals of the thermal cut-out. Then using an ohmmeter. make a
continuity test across the two terminals as described in the table below.
CARRY OUT 4J CHECKS
Table: Thermal cut-out Test
Parts Name
Thermal cut-out 145°C
Thermal cut-out 95°C
<
Temperature of “ON” condition Temperature of “OFF” condition
lndicatron ofohmmeter
I
(closed crrcuit) (‘Cl
(open circuit) (‘C;
i
(When room temperature f
is approx. 20-C‘,
i
Below -20-C
Above 14.5 C Ciosea e~rcu~:
I
Below 75°C
Above 95 C Closed c!rczif.
J
If incorrect readings are obtained, replace the thermal cut-out.
An open circuit thermal cut-out 145’C (MG) indicates that the magnetron has overheated, This mad ke
due to resistricted ventilation, cooling fan failure or a fault condition within the magnetrcn or HV 3:1rzziT
An open circuit thermal cut-out 145°C (OVEN) indicates that the foods in the oven may catcn fire. ths
may be due to over heating produced by improper setting of the cooking time or faiiure of the contrc:
panel.
An open circuit thermal cut-out 95°C (FAN) indicates that the fan motor !Jvinding has overheated. this
may be due to blocked ventilation or locked cooling fan.
G MONITOR RESISTOR TEST
CARRY OUT =CHECKS.
Disconnect the leads from the monitor resist. Using an ohmmeter and set on a low range. Check
between the terminals of the monitor resistor.
The resistance of monitor resistor is approx. 0.8 ohms.
If incorrect readings are obtained, replace the monitor resistor.
CARRY OUT 4R CHECKS.
H
MOTOR WINDING TEST
CARRY OUT 3DCHECKS
Disconnect the leads from the motor.
Using an ohmmeter, check the resistance between the two terminals as described in the table below.
Motors
Fan motor
Table: Resistance of Motor
Resistance
Aonroximatelv 370 12
1 Turntable motor
1 Approximately 16.08 kQ
If incorrect readings are obtained, replace the motor.
CARRY OUT fi CHECKS
13
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