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Sensor & Keypanel Failure Detection
The control will have software to constantly
detect sensor open/short failures and abnormal
high tempertures. After the failure occurs, 3 to
20 minutes may elaspe before the failure will be
displayed to the consumer. These failures will also
be displayed in the service mode. The table below
shows what will be displayed to the consumer
after each particular failure is detected and to the
technician when utilizing the service test mode.
Standard Test Load
The standard test load is one liter (1000 ml) water
with starting temperature of 59°F ~ 75°F in a 1000
ml beaker. (DO NOT USE ANY OTHER LOAD OR DISH
AS RESULTS WILL VARY FROM STANDARD.)
PERFORMANCE TEST FOR MICROWAVE
Use Clear Glass Tray and the beaker
1.
(Part # WB64x0073).
Record initial water temperature.
2.
Run at high power for 2:03 minutes.
3.
Record end water temperature. The minimum
4.
difference between the initial and ending
temperature should be: 32°F @ 120V.
Display Scrolls
Upper Thermal Sensor OPEN
SERVICE MAY
BE NEEDED
Upper Thermal Sensor SHORTED
Humidity Sensor OPEN
*
Abnormal High Temp
* *
Lower Thermal Sensor OPEN
Lower Thermal Sensor SHORTED
Turn ON for 5-minute test.
4.
Hold probe perpendicular to surface being
5.
tested. Scan surfaces at the rate of one inch per
second. Scan entire perimeter of door, control
panel, viewing surface of door window, and
exhaust vents.
Maximum leakage is 4 MW/CM2.
6.
Record data on service invoice and microwave
7.
leakage report.
Note
Maximum allowable leakage is 5 MW/CM2. Four
•
MW/CM2 is used to allow for measurement and
meter accuracy.
Inform the manufacturer of any oven found to
•
have emission in excess of 5 MW/CM2. Make
repairs to bring the unit into compliance at
no cost to owner and try to determine cause.
Instruct owner not to use oven until it has been
brought into compliance.
Place 275 ml water in 600 ml beaker.
1.
(Part # WB64x5010)
Place beaker in center of Clear Glass Tray.
2.
Set meter to 2450 MHz scale.
3.
Microwave Leak Test
*
Any defect of the humidity sensor will display
OPEN.
* *
Oven temperature higher than the set
temperature for more than 30 minutes.
