Sharp R-1900M (serv.man7) Service Manual ▷ View online
R1900M
6 – 7
2. Check the continuity of the fuse F1 and protector F21 on the power unit as follows.
i)
Disconnect the power supply cord, and then remove outer case and rear cover.
ii) Open the door and block it open.
iii) Discharge two high voltage capacitors.
iv) Remove the power unit from the oven, referring to “POWER UNIT REMOVAL”.
v) Check the continuity of the fuse F1 and the protector F21.
vi) If they are open, the power unit is defective
[18] R: RELAY UNIT TEST
1. CARRY OUT 3D CHECKS.
2. Remove the relay unit from the oven, referring to “RELAY UNIT REMOVAL”.
3. Check the continuity of the FUSE1 on the relay unit.
1) If it is open, the relay unit is defective.
4. Check the open and /or short of the transformer primary coil on the relay unit.
1) If it is open and /or short, it is defective.
5. Check the state of the relays contacts RY-1, RY-2 and RY-3 using an ohmmeter.
1) The relay contacts should be open. If not so, the relay unit is defective.
[19] S: ANTENNA SENSOR TEST
There is no test procedure for the antenna sensor.
When the error history display shows EE15, EE25 or EE35, if the antenna motors, control unit and wiring are normal, the antenna sensor may be
defective.
defective.
[20] T: MICROWAVE SENSOR TEST
There is no test procedure for the microwave sensor.
When the error history display shows EE18, EE28 or EE38, if the magnetrons, control unit and wiring are normal, the microwave sensor may be
defective.
defective.
R1900M
6 – 7
2. Check the continuity of the fuse F1 and protector F21 on the power unit as follows.
i)
Disconnect the power supply cord, and then remove outer case and rear cover.
ii) Open the door and block it open.
iii) Discharge two high voltage capacitors.
iv) Remove the power unit from the oven, referring to “POWER UNIT REMOVAL”.
v) Check the continuity of the fuse F1 and the protector F21.
vi) If they are open, the power unit is defective
[18] R: RELAY UNIT TEST
1. CARRY OUT 3D CHECKS.
2. Remove the relay unit from the oven, referring to “RELAY UNIT REMOVAL”.
3. Check the continuity of the FUSE1 on the relay unit.
1) If it is open, the relay unit is defective.
4. Check the open and /or short of the transformer primary coil on the relay unit.
1) If it is open and /or short, it is defective.
5. Check the state of the relays contacts RY-1, RY-2 and RY-3 using an ohmmeter.
1) The relay contacts should be open. If not so, the relay unit is defective.
[19] S: ANTENNA SENSOR TEST
There is no test procedure for the antenna sensor.
When the error history display shows EE15, EE25 or EE35, if the antenna motors, control unit and wiring are normal, the antenna sensor may be
defective.
defective.
[20] T: MICROWAVE SENSOR TEST
There is no test procedure for the microwave sensor.
When the error history display shows EE18, EE28 or EE38, if the magnetrons, control unit and wiring are normal, the microwave sensor may be
defective.
defective.
R1900M
6 – 7
2. Check the continuity of the fuse F1 and protector F21 on the power unit as follows.
i)
Disconnect the power supply cord, and then remove outer case and rear cover.
ii) Open the door and block it open.
iii) Discharge two high voltage capacitors.
iv) Remove the power unit from the oven, referring to “POWER UNIT REMOVAL”.
v) Check the continuity of the fuse F1 and the protector F21.
vi) If they are open, the power unit is defective
[18] R: RELAY UNIT TEST
1. CARRY OUT 3D CHECKS.
2. Remove the relay unit from the oven, referring to “RELAY UNIT REMOVAL”.
3. Check the continuity of the FUSE1 on the relay unit.
1) If it is open, the relay unit is defective.
4. Check the open and /or short of the transformer primary coil on the relay unit.
1) If it is open and /or short, it is defective.
5. Check the state of the relays contacts RY-1, RY-2 and RY-3 using an ohmmeter.
1) The relay contacts should be open. If not so, the relay unit is defective.
[19] S: ANTENNA SENSOR TEST
There is no test procedure for the antenna sensor.
When the error history display shows EE15, EE25 or EE35, if the antenna motors, control unit and wiring are normal, the antenna sensor may be
defective.
defective.
[20] T: MICROWAVE SENSOR TEST
There is no test procedure for the microwave sensor.
When the error history display shows EE18, EE28 or EE38, if the magnetrons, control unit and wiring are normal, the microwave sensor may be
defective.
defective.
R1900M
6 – 7
2. Check the continuity of the fuse F1 and protector F21 on the power unit as follows.
i)
Disconnect the power supply cord, and then remove outer case and rear cover.
ii) Open the door and block it open.
iii) Discharge two high voltage capacitors.
iv) Remove the power unit from the oven, referring to “POWER UNIT REMOVAL”.
v) Check the continuity of the fuse F1 and the protector F21.
vi) If they are open, the power unit is defective
[18] R: RELAY UNIT TEST
1. CARRY OUT 3D CHECKS.
2. Remove the relay unit from the oven, referring to “RELAY UNIT REMOVAL”.
3. Check the continuity of the FUSE1 on the relay unit.
1) If it is open, the relay unit is defective.
4. Check the open and /or short of the transformer primary coil on the relay unit.
1) If it is open and /or short, it is defective.
5. Check the state of the relays contacts RY-1, RY-2 and RY-3 using an ohmmeter.
1) The relay contacts should be open. If not so, the relay unit is defective.
[19] S: ANTENNA SENSOR TEST
There is no test procedure for the antenna sensor.
When the error history display shows EE15, EE25 or EE35, if the antenna motors, control unit and wiring are normal, the antenna sensor may be
defective.
defective.
[20] T: MICROWAVE SENSOR TEST
There is no test procedure for the microwave sensor.
When the error history display shows EE18, EE28 or EE38, if the magnetrons, control unit and wiring are normal, the microwave sensor may be
defective.
defective.
Display
