Sharp R-319FW Service Manual page 22

R-319FW
PROCEDURE
LETTER
(9) Reconnect the oven to the power supply and check the sensor cook operation as follows:
9-1. Fill approximately 200 milliliters (7.2 oz) of tap water in a 1000 milliliter measuring cup.
9-2. Place the container on the center of tray in the oven cavity.
9-3. Close the door.
9-4. Touch REHEAT SENSOR pad once.
9-5. The control panel is in automatic Sensor operation.
9-6. The display will start to count down the remaining cooking time, and the oven will turn off
If new sensor dose not operate properly, the problem is with the control unit, and refer to explanation
below.
(1) Disconnect the power supply cord, and then remove outer case.
(2) Open the door and block it open.
(3) Discharge high voltage capacitor.
(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) Disconnect the leads to the primary of the power transformer.
(7) Ensure that these leads remain isolated from other components and oven chassis by using insulation
tape.
(8) After that procedure, re-connect the power supply cord.
(9) Check the sensor cook operation proceed as follows:
9-1. Touch REHEAT SENSOR pad once.
9-3. After approximately 30 seconds, push plunger of select switch for more than 3 seconds. This
9-4. After approximately 3 seconds, the display shows " X X . X X " which is the remaining cooking
If the above is not the case, the control unit is probably defective.
If the above is proper, the AH sensor is probably defective.
(10) Disconnect the power supply cord, and then remove outer case.
(11) Open the door and block it open.
(12) Discharge high voltage capacitor.
(13) Disconnect the dummy resistor circuit from the sensor connector of control panel.
(14) Carry out necessary repair.
(15) Reconnect all leads removed from components during testing and repairing.
(16) Re-install the outer case (cabinet).
(17) Reconnect the power supply cord after the outer case is installed. Run the oven and check all
functions.
(18) Carry out "Water load cooking test" again and ensure that the oven works properly.
R1, R2 :
R3 : 4.3k
R4 :
TEST PROCEDURES
automatically after the water is boiling (bubbling).
9-2. The control panel is in the sensor cooking operation.
condition is same as judgement by AH sensor.
time, and the display count down.
Ω
± 1% 1/2W
22
Ω
± 5% 1/4W
Ω
± 5% 1/4W
1M
To connector (F)
on Control Unit.
F-1
F-2
F-3
CONNECTOR
Sensor Dummy Resistor Circuit
COMPONENT TEST
CHECKING CONTROL UNIT
Ω ±
R1, R2 : 22 1% 1/2W
Ω ±
R3 : 4.3k 5% 1/4W
Ω ±
R4 : 1M 5% 1/4W
1
2
R1
3
R3 R4
R2
20
Plunger
NC
NO
COM
COM NO
NC