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13
R - 2 2 A T
R-23AM
R - 2 4 A T
R-23AM
R - 2 4 A T
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
J
MONITOR RESISTOR R1 TEST
CARRY OUT 3D CHECKS.
Disconnect the leads from the monitor resistor R1. Using an ohmmeter and set on a low range. Check
between the terminals of the monitor resistor R1.
between the terminals of the monitor resistor R1.
The resistance of monitor resistor R1 should be read approx. 4.3
Ω
.
If incorrect readings are obtained, replace the monitor resistor R1.
CARRY OUT 4R CHECKS.
1. CARRY OUT 3D CHECKS.
2. Follow the procedures below for each thermistor.
2. Follow the procedures below for each thermistor.
2-1. MAGNETRON THERMISTOR TEST
Disconnect the connector of the magnetron thermistor from the switch harness. Measure the
resistance of the magnetron thermistor with an ohmmeter. Connect the ohmmeter leads to the leads
of the thermistor.
Disconnect the connector of the magnetron thermistor from the switch harness. Measure the
resistance of the magnetron thermistor with an ohmmeter. Connect the ohmmeter leads to the leads
of the thermistor.
Room Temp.
59˚F (15˚C)
68˚F (20˚C)
77˚F (25˚C)
Resistance
Approx. 373 k
Ω
Approx. 292 k
Ω
Approx. 231 k
Ω
If the meter does not indicate above resistance, replace the thermistor.
2-2. OVEN THERMISTOR (1) TEST
Disconnect the connector of the oven thermistor (1) from the switch harness. Measure the resistance
of the oven thermistor (1) with an ohmmeter. Connect the ohmmeter leads to the leads of the thermistor.
of the oven thermistor (1) with an ohmmeter. Connect the ohmmeter leads to the leads of the thermistor.
Room Temp.
59˚F (15˚C)
68˚F (20˚C)
77˚F (25˚C)
Resistance
Approx. 373 k
Ω
Approx. 292 k
Ω
Approx. 231 k
Ω
If the meter does not indicate above resistance, replace the thermistor.
2-3. OVEN THERMISTOR (2) TEST
Disconnect the two connectors of the magnetron thermistor and oven thermistor (2) from the switch
harness. Measure the resistance of the oven thermistor (2) with an ohmmeter. Connect the ohmmeter
leads to the leads of the thermistor.
harness. Measure the resistance of the oven thermistor (2) with an ohmmeter. Connect the ohmmeter
leads to the leads of the thermistor.
Room Temp.
59˚F (15˚C)
68˚F (20˚C)
77˚F (25˚C)
Resistance
Approx. 16 k
Ω
Approx. 13 k
Ω
Approx. 11 k
Ω
If the meter does not indicate above resistance, replace the thermistor.
3. CARRY OUT 4R CHECKS.
3. CARRY OUT 4R CHECKS.
K
THERMISTOR TEST
L
MOTOR WINDING TEST
CARRY OUT 3D CHECKS.
Disconnect the leads from the motor. Using an ohmmeter, check the resistance between the two
terminals.
Disconnect the leads from the motor. Using an ohmmeter, check the resistance between the two
terminals.
Resistance of Blower motor should be approximately 52
Ω
.
Resistance of Stirrer motor should be approximately 8.8 k
Ω
.
If incorrect readings are obtained, replace the motor.
CARRY OUT 4R CHECKS.
M
NOISE FILTER TEST
CARRY OUT 3D CHECKS.
Disconnect the leads from the terminals of noise filter. Using an ohmmeter, check between the
terminals as described in the following table.
terminals as described in the following table.
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