Sharp R-969IN

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R969(W)

8 – 6

[16] Procedure P: PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE

PRINTED WIRING BOARD (PWB) IS OPEN

To protect the electronic circuits, this model is provided with a fine foil pattern added to the input circuit on the PWB, this foil pattern acts as a fuse. If

the foil pattern is open, follow the troubleshooting guide given below for repair.

Problem: POWER ON, indicator does not light up.

CARRY OUT 3D

CHECKS.

NOTE: *At the time of these repairs, make a visual inspection of the varistor for burn-

ing damage and examine the transformer with tester for the presence of layer

short circuit (check primary coil resistance).

If any abnormal condition is detected, replace the power unit.

CARRY OUT 4R

CHECKS.

[17] Procedure Q: AH SENSOR TEST

Checking the initial sensor cooking condition

1) The oven should be plugged in at least two minutes before sensor cooking.

2) Room temperature should not exceed 35°C.

3) The unit should not be installed in any area where heat and steam are generated.

The unit should not be installed, for example, next to a conventional surface unit.

Refer to the “INSTALLATION Instructions”.

4) Exhaust vents are provided on the back of the unit for proper cooling and air flow in the cavity. To permit adequate ventilation, be sure to install so

as not to block these vents. There should be some space for air circulation.

5) Be sure the exterior of the cooking container and the interior of the oven are dry. Wipe off any moisture with a dry cloth or paper towel.

6) The Sensor works with food at normal storage temperature. For example, chicken pieces would be at refrigerator temperature and canned soup at

room temperature.

7) Avoid using aerosol sprays or cleaning solvents near the oven while using Sensor settings. The sensor will detect the vapor given of by the spray

and turn off before food is properly cooked.

8) After the oven is started on sensor cooking condition, if the sensor has not detected the vapor of the food, ERROR will appear and the oven will

shut off.

Water load cooking test

Make sure the oven has been plugged in at least two minutes before checking sensor cook operation.

The cabinet should be installed and screws tightened.

1) Fill approximately 200 milliliters (7.2 oz.) of tap water in a 1000 milliliter measuring cup.

2) Place the container on the center of tray in the oven cavity.

3) Close the door.

4) Touch SENSOR COOK pad once. Now, the oven is in the sensor cooking condition and “EINTOPF” will appear in the display. (In case of that Ger-

man has been selected as language.)

5) The oven will operate for the first 16 seconds, without generating microwave energy.

NOTE: ERROR will appear if the door is opened or STOP pad is touched during first stage of sensor cooking.

6) After approximately 16 seconds, microwave energy is produced, and the display should start to count down the remaining cooking time and oven

should turn off after water is boiling (bubbling).If the oven does not turn off, replace the AH sensor or check the control unit, refer to explanationbe-

low.

1. 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 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.

STEPS OCCURRENCE CAUSE OR CORRECTION

The rated AC voltage is not present between Pin No. 1 and 3 of the 4-pin

connector (E).

Check supply voltage and oven power cord.

2 The rated AC voltage is present at primary side of low voltage transformer.