Sharp KB-5121KS Service Manual page 18

KB-5121KS/K/W
PROCEDURE
LETTER
8) Reconnect all leads removed from components during testing.
9) Re-install the covers.
10) Reconnect the power source after the cabinets are installed.
11) Run the oven and check all functions.
F AH SENSOR TEST
Checking the initial sensor cooking condition
WARNING : The oven should be fully assembled before following procedure.
(1) The oven should be plugged in at least two minutes before sensor cooking.
(2) Room temperature should not exceed 95
(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"
of the operation manual.
(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) If the sensor has not detected the vapor of the food, ERROR will appear and the oven will shut off.
Water load cooking test
WARNING : The oven should be fully assembled before following procedure.
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 the UPER MICROWAVE OVEN pad,
SENSOR LOAD pad on the LCD. And touch the number pad 4 once. Now, the oven is in the sensor
cooking condition, and "20BIT" and "MICRO" will appear in the display.
(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/CLEAR pad is touched during first stage of sensor
(6) After approximately 16 seconds, microwave energy is produced.
If ERROR is displayed or 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)
2) Open the drawer and block it open.
3)
4)
TEST PROCEDURES
STEPS OCCURRENCE
1 The rated AC voltage is not present between
Pin Nos. 1and 3 of the 2-pin connecter (CN-B).
2 The rated AC voltage is present at primary
side of touch control transformer.
cooking.
TESTING METHOD FOR AH SENSOR AND/OR CONTROL UNIT
Disconnect the power source, and then disassemble as per "COOK TOP/MICROWAVE
DRAWER DISASSEMBLY" page 32.
Discharge high voltage capacitor.
Remove the AH sensor.
COMPONENT TEST
CAUSE OR CORRECTION
Check supply voltage and oven power cord.
Touch control transformer or secondary circuit defective.
Check and replace touch control transformer or power
unit .
o o
F (35 C).
pad, pad, START MINUTE PLUS pad and the
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