KitchenAid KHMS105E service manual Control Circuit Board Check List, Voltage circuits

COMPONENT	TEST PROCEDURE		RESULT
Relay 2	Set the ohmmeter to the R x 1
WARNING: When you apply	scale, and check	for continuity
	between the two	relay terminal
power to the unit, be careful
	pins. Use the following steps.
not to touch any of the high
	1.Remove the wire connectors
voltage circuits.
	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.
				∞	0	∞	0
	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-			CLOSED		OPEN
	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.

CONTROL CIRCUIT BOARD CHECK LIST

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.

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