KitchenAid KHMS105E service manual Keyboard Matrix

Microwave Oven Hood Combo Service Manual — LIT 4317216

Original 03/97

Page 3-23

COMPONENT		TEST PROCEDURE	RESULT
Touch Keyboard (see below).		Measure the resistance between	Normal Readings:
		the terminal pins of the keypad	KEYPAD NOT PRESSED - In-
		(shown below) that you wish to
FPC CONNECTOR			dicates more than 1 MΩ re-
		check.
			sistance.
(TOP)		For example: To measure the
			Normal Readings:
	1	“TEMP PROBE” keypad, refer to
	2		KEYPAD PRESSED - Indicates
		the illustration, and:
	3
	4	1.Find the first terminal number	less than 400 Ω resistance.
	5
		along the top bar (pin 4).
	6		Abnormal Readings:
	7	2.Find the second terminal num-
	8	ber in the side bar (pin 8).	KEYPAD NOT PRESSED - In-
	9	3.Set the ohmmeter to the R x 1	dicates continuity (zero re-
	10		sistance).
		scale.
	11
	12	a) With the keypad not de-	Abnormal Readings:
	13
		pressed, touch the ohmmeter	KEYPAD PRESSED - Indicates
		leads between pins 4 and 8	infinite resistance.
		on the ends of the FPC con-
		nector.
		b) Press the TEMP PROBE
		keypad.

8

9

10

11

12

13

KEYBOARD MATRIX

1	2	3		4	5	6	7
	AUTO	BEVERAGE	TEMP	CLOCKSET		6	0
	ROAST		PROBE
	FAN		CUSTOM		TIMER	7	1
	HIGH / LOW	POPCORN	DEFROST	SET/START
	/ OFF
		KEEP			TIMER	8	2
		WARM			CANCEL
		EASY			DELAY	9	3
		MINUTE			START
	LIGHT	FAVORITE			MICRO	CANCEL
	ON / NIGHT						4
		RECIPE			COOK	OFF
	/ OFF
		AUTO			COOK		5
		COOK			POWER	START

3-23