3-14
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.
4. 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.
5. After approximately 2-
1
/2 to 3-minutes,
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.
CHECKING THE MICROWAVE POWER OUTPUT
TEST PROCEDURE
OR CORRECTION
1. No power at wall plug.
Console will not display data,
or has incorrect data.
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.
PROBLEM
POSSIBLE CAUSE
2. Open line fuse.
3. Thermal fuse.
4. Thermal fuse on magne-
tron.
5. Interlock safety switches.
6. Control board.
1. Magnetron. 1. Check magnetron.
Erratic console display dur-
ing operation.
Display continues to count
down when door is open dur-
ing a “Cook” cycle.
1. Secondary interlock
switch.
1. Check secondary inter-
lock switch. Replace, if
defective.
2. Check control board.
Oven operates without a
“Start” command.
1. Defective control board.
1. Replace control board.
2. Control board.
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