Sharp R-CD1200M Service Manual

RCD1200M
7 – 4
[9] I: FUSE 12A (1) (2) TEST
1. Disconnect the power supply cord, and then remove outer case and rear cabinet.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. If the fuse is blown, check the magnetron, high voltage capacitor, high voltage rectifier assembly, according to the “TEST PROCEDURE” before
replacing the blown fuse. Then replace the fuse.
5. Reconnect all leads removed from components during testing.
6. Reinstall the rear cover and the outer case (cabinet).
7. Reconnect the power supply cord after the rear cover and the outer case are installed.
8. Run the oven and check all functions.
[10] J: TEMPERATURE FUSE TEST
1. Disconnect the power supply cord, and then remove outer case and rear cabinet.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. A continuity check across the temperature fuse terminals should indicate a closed circuit unless the temperature of the temperature fuse reaches
specified temperature as shown below.
5. Reconnect all leads removed from components during testing.
6. Reinstall the rear cover and the outer case (cabinet).
7. Reconnect the power supply cord after the rear cover and the outer case are installed.
8. Run the oven and check all functions.
CAUTION: IF THE TEMPERATURE FUSE INDICATES AN OPEN CIRCUIT AT ROOM TEMPERATURE, REPLACE TEMPERATURE FUSE.
[11] K: MAGNETRON THERMISTOR TEST
1. Disconnect the power supply cord, and then remove outer case and rear cabinet.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect the connector of the magnetron thermistor from the harness. Measure the resistance of the thermistor with an ohmmeter. Connect the
ohmmeter leads to the connector of the thermistor.
If the meter does not indicate above resistance, replace the thermistor.
5. Reconnect all leads removed from components during testing.
6. Reinstall the rear cover and the outer case (cabinet).
7. Reconnect the power supply cord after the rear cover and the outer case are installed.
8. Run the oven and check all functions.
[12] L: EXHAUST THERMISTOR TEST
The exhaust thermistor can be checked by using the Special function (SF-6). Check the exhaust thermistor, referring to the pages of the Exhaust ther-
mistor check (SF-6).
If the display shows “OH”, the exhaust thermistor is normal. If the display shows “no”, the exhaust thermistor is abnormal and it should be replaced.
Open temperature Close temperature Display or
Condition
Check point
Magnetron temperature
fuse (1)
150°C Non resetable type
EE1
Magnetron (1) Failure:
Test magnetron (1) and fan motor.
Magnetron temperature
fuse (2)
EE2
Magnetron (2) Failure:
Test magnetron (2) and fan motor.
Magnetron temperature
fuse (1), (2)
EE3
Magnetron (1), (2) Failure: Test magnetron (1), (2).
Check fan motor and ventilation opening.
Oven temperature fuse 120°C Non resetable type Oven shut off
Food has been burned in oven.
Temperature of oven inside is very high.
Room temperature Resistance
68°F (20°C) Approx. 750KΩ

Sharp R-CD1200M Specifications

General

Brand	Sharp
Model	R-CD1200M
Category	Microwave Oven
Language	English