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© 1997 Whirlpool Corporation
Cooking Products Service Manual
Original March, 1997 4322167
Page 3-23
Power
Level
1 4 Seconds 18 Seconds
2 6 Seconds 16 Seconds
3 8 Seconds 14 Seconds
4 10 Seconds 12 Seconds
5 12 Seconds 10 Seconds
6 14 Seconds 8 Seconds
7 16 Seconds 6 Seconds
8 18 Seconds 4Seconds
9 20 Seconds 2Seconds
10 22 Seconds 0Seconds
TEST PROCEDURE RESULTCOMPONENT
Relay 2 (RY2)
WARNING: When you apply
power to the unit, be careful
not to touch any of the high
voltage circuits.
Set the ohmmeter to the
R x 1
scale, and check for continuity
between the two relay terminal
pins. Use the following steps.
1.Remove the wire connectors
from the relay terminals.
2.Use a pair of alligator clips,
and clip the ohmmeter leads
to the two terminals of the re-
lay. Make sure that you do not
allow the clips to short to any-
thing.
3.Plug the microwave oven into
an AC receptical.
4.Set the power level, as shown
in the chart in the right col-
umn, and check the relay op-
eration for the ten power lev-
els. NOTE: During the operat-
ing time set for each level, the
relay will close (short) for the
time specified in the chart, and
then open for another speci-
fied amount of time. When the
open time elapses, the cycle
begins again until the cooking
time elapses and the oven
turns off.
∞ 00
OPEN
CLOSED
∞
The following problems indicate a defective
control circuit board:
1. The START function fails to operate, but
the high voltage systems, the interlock
switches, the door sensing, and the relay
checks are good.
2. The oven operates okay with a replace-
ment relay installed.
3. Proper temperature measurements can-
not be obtained.
4. The buzzer does not sound, or continues
to sound.
5. Some segments of one or more digits do
not light up, or they continue to light up,
or segments light when they should not.
6. Wrong figures appear on the display.
7. The digits on the display flicker.
8. Some of the indicators do not light.
9. The clock does not keep the proper time.
CONTROL CIRCUIT BOARD CHECK LIST