Sharp Carousel R-990KS Manual de serviço - Página 19
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f) The display will start to count down the remaining cooking time, and the oven will turn off automatically after the water is boiling (babbling).
If new sensor dose not operate properly, the problem is with the control unit.
2. 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 lower portion of 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:
a) Touch REHEAT SENSOR pad twice and touch the INSTANT COOK/START pad.
b) The control panel is in the sensor cooking operation.
c) After approximately 20 seconds, push plunger of select switch. This condition is same as judgement by AH sensor.
d) After approximately 3 seconds, the display shows "X X. X X " which is the remaing cooking time, and the display counts down.
If the above is not the case, the control unit is probably defective.If the above is proper, the AH sensor is probably defective.
R1,R2:22Ω±1% 1/2W
R3:4.3kΩ±?5% 1/4W
R4:1MΩ±5% 1/4W
T o c onnec tor (F )
on C ontrol Unit.
1
F -1
2
F -2
3
F -3
C ONNE C T OR
R 1
R 3
R 4
R 2
Sensor Dummy Resistor Circuit
8 – 7
P lunger
NC
NO
C OM
C OM NO
NC
R990K(W)