R-480J

TEST PROCEDURES

PROCEDURE

LETTER

COMPONENT TEST

 

 

TESTING METHOD FOR AH SENSOR AND/OR CONTROL UNIT

To determine if the sensor is defective, the simplest method is to replace it with a new replacement sensor.

(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)Remove the AH sensor.

(5)Install the new AH sensor.

(6)Reconnect all leads removed from components during testing.

(7)Re-install the outer case (cabinet).

(8)Reconnect the power supply cord after the outer case is installed.

(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 the CLOCK pad once, the POWER LEVEL pad twice, the START pad once, the number pad 1 once and the number pad 4 once.

9-5. The control panel is in automatic Sensor operation.

9-6. The oven turns off automatically, and the time for detecting moisture will be displayed.

If new sensor dose not operate properly, the problem is with the control unit, and refer to explanation below.

CHECKING CONTROL UNIT

(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 the CLOCK pad once, the POWER LEVEL pad twice, the START pad once and the number pad 1 once and the number pad 4 once.

9-2. The control panel is in the sensor cooking operation.

9-3. After approximately 25 seconds, push plunger of select switch for more than 3 seconds. This condition is same as judgement by AH sensor.

9-4. After approximately 3 seconds, the display shows “ X X . X X “ which is the time for detecting moisture.

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 : 22Ω ± 1% 1/2W

R3 : 4.3kΩ ± 5% 1/4W

R4 : 1MΩ ± 5% 1/4W

To connector (F) on Control Unit.

F-1

1

 

 

 

2

 

 

COM

F-2

R1

 

3

 

 

 

 

 

 

F-3

 

R2

R3

R4

 

CONNECTOR

 

 

 

 

Plunger

NC

NO

COM

NO

NC

Sensor Dummy Resistor Circuit

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Image 17
Sharp R-480J service manual Test Procedures Letter, Testing Method for AH Sensor AND/OR Control Unit, Checking Control Unit

R-480J specifications

The Sharp R-480J is a notable microwave oven that combines advanced technology with practical design, catering to both everyday cooking needs and more complex culinary tasks. This model is designed for consumers seeking reliability and efficiency in their kitchen appliances.

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