Touch Panel & Microcomputer Board Test - Whirlpool MH9180XL Service Manual

TOUCH PANEL & MICROCOMPUTER BOARD TEST
The microwave oven has a self-diagnostic test
that can be accessed through the touch panel
keypad. To perform the test:
1. Be sure power is connected to the micro-
wave oven and that the door is closed.
NOTE: You will have to access the touch panel
and the power cord plug in the next step. If you
cannot access them both, have another per-
son available to help you with the step.
2. Perform the following sequence to enter
the touch panel "self-test" mode:
a) Press and hold the OFF/CANCEL key-
pad.
b) Open the oven door.
c) Unplug the power cord plug for 2 sec-
onds and then plug it back in.
d) Release the OFF/CANCEL keypad and
close the door.
3. Press each touch panel keypad, as shown
in the Key Table to the right. As you do, the
number 8 should appear in the display
position shown in the chart, to indicate that
the circuits are complete, and that the re-
lays are working properly.
NOTE: If you should press the OFF/CANCEL
keypad during any of the tests, you will exit the
test mode. Perform step 2 to reenter the test
mode.
5 4
3 2 1
Key Name
POPCORN
BAKED POTATO
DINNER PLATE
BEVERAGE
SOFTEN
REHEAT
COOK
DEFROST
MELT
COOK TIME
COOK POWER
WARM HOLD
KIDS MENU
1
2
3
4
5
6
7
8
9
0
TIMER SET/OFF
CLOCK
JET START
LIGHT
ON/NIGHT/OFF
VENT FAN
4 SPEEDS
TURNTABLE
ON/OFF
OFF/CANCEL
* " 8" will appear in the display position indicated
in the table.
Eight seconds after pressing COOK, "Hmxxx" will
appear in the display.
6-4
Display
Function
Position*
–
5
4
–
–
3
–
2
–
1
–
5
Humidity Sensor
–
2
–
1
–
5
–
4
–
2
–
1
Relay 4901 5
–
4
Relay 4903
3
–
5
–
4
Relay 4906 3
–
5
–
4
3
Hood Fan Triac
–
4
–
5
Buzzer
3
1
–
–
5
– 4
–
3
–
Exit Test Mode