Checking The Microwave Power Output - Whirlpool 1997 "E" Service Manual

PROBLEM
Console will not display data,
or has incorrect data.
Erratic console display dur-
ing operation.
Display continues to count
down when door is open dur-
ing a "Cook" cycle.
O v e n o p e r a t e s w i t h o u t a
"Start" command.

CHECKING THE MICROWAVE POWER OUTPUT

Use the following procedure to checkout the
operation of the microwave oven.
1. Fill a 1-cup (260 ml) glass measuring cup
with warm water (between 90˚F/32˚C and
100˚F/38˚C).
2. Open the oven door, place the container
of water into the oven, and close the door.
3. Press the COOK keypad, and set the
cooking time for 4-minutes.
POSSIBLE CAUSE
1. No power at wall plug.
2. Open line fuse.
3. Thermal fuse.
4. Thermal fuse on magne-
tron.
5. Interlock safety switches.
6. Control board.
1. Magnetron.
1. Secondary interlock
switch.
2. Control board.
1. Defective control board.
4.
5.
3-14
TEST PROCEDURE
OR CORRECTION
1. Check fuse or breaker
box.
2. Replace line fuse.
3. Check thermal fuse.
4. Check magnetron ther-
mal fuse.
5. Check interlock safety
switches. Replace, if de-
fective.
6. Check control board.
1. Check magnetron.
1. Check secondary inter-
lock switch. Replace, if
defective.
2. Check control board.
1. Replace control board.
Press the START/ENTER keypad. The
oven cavity light should come on, the
cooking cycle should begin, and the timer
should count down in "seconds" from 4:00.
After approximately 2-
the water should start to boil. If more than
3-minutes is required, it could mean that
the operating voltage is low, (below 110-
volts), or it is not functioning properly and
may need to be checked by a qualified
technician.
1
/ to 3-minutes,
2