Bosch HMV9302 - 1.8 cu. Ft. Microwave Service Manual page 28

COMPONENTS
TOUCH KEY
BOARD
SENSOR
(For sensor model only)
TEST PROCEDURES
Measure the resistance between terminal
pins of connector KEY CONNECTOR.
NOTE:
When reconnecting the FPC connector,
make sure that the holes on the FPC
connector are properly engaged with hooks
on the plastic fastener.
MATRIX CIRCUIT FOR
TOUCH KEY BOARD
CONNECTOR(KEY CON)
1 2
3
VENT
HELP N.C N.C
HI/LO/OFF
8
LIGHT CONTROL
N.C N.C
SET-UP
HI/LO/OFF
9
EASY
LESS CLOCK N.C
COOK
10
LIGHT
FAVORITE TIME
N.C
TIMER
RECIPE DEFROST
11
T/TABLE STOP QUICK
START
ON/OFF CLEAR DEFROST
12
SENSOR SENSOR SENSOR
MORE
PIZZA POTATO POPCORN
13
Figure 27
Figure 29
4 5 7
6
PROGRAM 5 0
AUTO
6
1
DEFROST
KITCHEN
7 2
TIMER
POWER
8
3
LEVEL
HOLD
9 4
WARM
SENSOR SENSOR SENSOR
VEGETABLE REHEAT COOK
Normal: Approximately
Abnormal: Infinite or several.
1 BK
2 RD
3 WH
7-17
RESULTS
When
Resistance touched
value
Less than More than
400 ohms 1 mega ohm
FPC CONNECTOR
Top
Figure 28
BK~RD: 4.5~6.2 Kohm
RD~WH: 2.0~3.5 Kohm
BK~WH: 2.0~3.5 Kohm
When not
touched
1
2
3
4
5
6
7
8
9
10
11
12
13