Read Sharp R-4G75M (serv.man3) Service Manual online
16
R-4G75(W)M
R-4G75(B)M
R-4G75(B)M
(4) Touch INSTANT COOK pad five times. Now, the oven is in the sensor cooking condition. IC-5 will
appear in the display.
(5) The oven will operate for the first 16 seconds, without generating microwave energy.
NOTE: ERROR will appear if the door is opend or STOP/CLEAR pad is touched during first stage of sensor
NOTE: ERROR will appear if the door is opend or STOP/CLEAR pad is touched during first stage of sensor
cooking
(6) After approximately 16 seconds, microwave energy is produced, oven should turn off when water is
boiling (bubling).
If the oven does not turn off, replace the AH sensor or check the control unit, refer to explanation below.
If the oven does not turn off, replace the AH sensor or check the control unit, refer to explanation below.
TESTING METHOD FOR AH SENSOR AND/OR CONTROL UNIT
To determine if the sensor is defective, the simplest method is to replace it with anew replacement sensor.
(1) Disconnect oven from power supply and remove outer case.
(2) Discharge the high voltage capacitor.
(3) Remove the AH sensor.
(4) Install the new AH sensor.
(5) Re-install the outer case.
(6) Reconnect the oven to the power supply and check the sensor cook operation proceed as follows:
(1) Disconnect oven from power supply and remove outer case.
(2) Discharge the high voltage capacitor.
(3) Remove the AH sensor.
(4) Install the new AH sensor.
(5) Re-install the outer case.
(6) Reconnect the oven to the power supply and check the sensor cook operation proceed as follows:
6-1. Fill approxmately 200 milliliters (7.2 oz) of tap water in a 1000 milililiter measuring cup.
6-2. Place the container on the center of tray in the oven cavity.
6-3. Close the door.
6-2. Place the container on the center of tray in the oven cavity.
6-3. Close the door.
CHECKING CONTROL UNIT
(1) Disconnect oven from power supply and remove outer case.
(2) Discharge the high voltage capacitor.
(3) Disconnect the wire leads from the cook relay.
(4) Disconnect the sensor connector that is mounted to control panel.
(5) Then connect the dummy resistor circuit (see fig.) to the sensor connector of control panel.
(6) Reconnect the oven to the power supply and check the sensor cook operation proceed as follows:
(2) Discharge the high voltage capacitor.
(3) Disconnect the wire leads from the cook relay.
(4) Disconnect the sensor connector that is mounted to control panel.
(5) Then connect the dummy resistor circuit (see fig.) to the sensor connector of control panel.
(6) Reconnect the oven to the power supply and check the sensor cook operation proceed as follows:
6-1. Touch INSTANT COOK pad five times.
6-2. The control panel is in the sensor cooking operation.
6-3. After approxmately 20 seconds, push plunger of select switch. This condition is same as judgement
6-2. The control panel is in the sensor cooking operation.
6-3. After approxmately 20 seconds, push plunger of select switch. This condition is same as judgement
by AH sensor.
6-4. After approxmately 3 seconds, cooking operation turns off, an audible signal will sound, and the
display will then revert to the time of day.
If the above is not the case, the control unit is probably defective.
If the above is proper, the AH sensor is probably defective
If the above is proper, the AH sensor is probably defective
R1,R2 : 22 ohm
±
1% 1/2W
R3 : 10k ohm
±
5% 1/2W
R4 : 1M ohm
±
5% 1/2W
TEST PROCEDURES (CONT'D)
PROCEDURE
LETTER
COMPONENT TEST
Sensor Dummy Resistor Circuit
Plunger
NC
NO
COM
COM
NO
NC
R3
R4
R1
R2
1
2
3
F-1
F-2
F-3
To connector (F)
on Control Unit.
on Control Unit.
CONNECTOR
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