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R-880F(S)

PROCEDURE

LETTER

NOTE: *At the time of these repairs, make a

CARRY OUT 4R CHECKS.

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 five 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 Fresh vegetables pad. Now, the oven is in the sensor cooking condition and "FRESH",

"VEGETABLES", "SENSOR" and "COOKING" will appear in the display.

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

When the AH sensor is defective (open or short), ERROR will appear in the display immediately.

If ERROR appears check sensor wire connections and/or AH sensor.

NOTE: ERROR will appear if the door is opened or STOP/CLEAR pad is touched during first stage of

(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 explanation

below.

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

TEST PROCEDURES

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 defective parts.

sensor cooking.

TESTING METHOD FOR AH SENSOR AND/OR CONTROL UNIT

COMPONENT TEST

VRS1

FAN

CN - A