Sharp R-8320E User Manual

TEST PROCEDURES (CONT’D)
PROCEDURE
LETTER
COMPONENT TEST
M.
HEATING ELEMENT TEST
Make sure the heating element is fully cooled and test the followings;
a. Disconnect wire leads and measure the resistance with an ohmmeter. On the R x 1 scale, the
resistance between the heating element terminals should be approximately 9.6 ohms.
b. Disconnect wire leads and measure the insulation resistance with 500V-lOOMa insulation
resistance meter.
The insulation resistance between heating element terminal and cavity should be more than
0.5MSX
N THERMISTOR TEST
Disconnect leads from the thermistor and remove the thermistor. Measure the resistance of the
thermistor with an ohmmeter.
Resistance
High0
Room Temp.
COM. - High
COM. - Low
Low
20°C - 30°C
Approx.
Approx.
322 - 165kSZ
68 - 35kS2
El
Cornmo” 0
If the meter does not indicate these resistance, replace the thermistor.
THERMISTOR
0
DAMPER MOTOR TEST’
When the power cord is plugged into the wall receptacle, the 220/240 volts A.C. is supplied to the
damper motor and the motor operates until the damper is opened and the damper switch closes.
Then the damper motor stops operating.
If the damper motor does not operate, check for input voltage by A.C. volt-meter at the motor.
1. Disconnect the power cord from the wall receptacle.
2. Disconnect the 2-pin connector of motor and connect the meter leads to the 2-pin connector of
main wire harness.
3. Reconnect the power cord into the wall receptalcle.
If 220/240 volts A.C. is indicated at the 2-pin connector, replace the motor.
Not indicated, check the wire harness and the relay unit.
P
DAMPER SWITCH TEST
Disconnect the wire leads from the switch terminals and connect the ohmmeter leads to the com-
mon (COM) and normally open (NO) terminals of the switch.
1. When switch actuator is pushed by the damper motor cam, the meter should indicate a closed
circuit.
2. When the power cord is plugged into the wall receptacle, the damper motor operates and damper
cam starts rotate. Then switch actuator is released and meter should indicate an open circuit.
In case jmproper operation is indicated, replace the damper switch.
58

Sharp R-8320E Specifications

General

Brand	Sharp
Model	R-8320E
Category	Microwave Oven
Language	English