Procedure O: Ah Sensor Test - Sharp R-426LS Service Manual

R426LS
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) Run the oven and check all functions.
2. Follow the troubleshooting guide given below, if indicator does not light up after above
check and repairs are finished.
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 leads to the primary of the power transformer.
5) Ensure that these leads remain isolated from other components and oven chassis by using insulation tape.
6) After that procedure, re-connect the power supply cord.
7) Follow the troubleshooting guide given below for repair.
STEPS
The rated AC voltage is not present between the cabinet side terminal of
1
the relay RY1 and the lower side terminal of the relay RY2.
The rated AC voltage is present at primary side of low voltage trans-
2
former.
8) Disconnect the power supply cord and then remove outer case.
9) Open the door and block it open.
10)Discharge high voltage capacitor.
11)Reconnect all leads removed from components during testing.
12)Re-install the outer case (cabinet).
13)Reconnect the power supply cord after the outer case is installed.
14)Run the oven and check all functions.

[16] Procedure O: 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 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 conven-
tional 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
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 of tap water in a 1000 milliliter measuring cup.
2) Place the container on the center of tray in the oven cavity.
3) Open the door.
4) Touch the TIMER/CLOCK pad once, the POWER LEVEL pad twice. Close the door and touch the START pad once. Open the door and touch the
number pads 1 once and the number pad 4 once. Close the door and touch the START pad. Now, the oven is in the sensor cooking condition, and
"AH20", "SENSOR" and "COOK" 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 cooking.
OCCURRENCE
8 – 7
a
b
c
CAUSE OR CORRECTION
Check supply voltage and oven power cord.
Low voltage transformer or secondary circuit defective.
Check and replace control unit.
d