LG LMVM1935SB Service Manual page 29

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)
2
1 3
COOK
CHICKEN AUTO
TIMER
TIME
CHOICES
DEFROST
8
POWER
RICE
N.C
LESS
LEVEL
9
6
POTATO
N.C N.C
10
HOLD
2
N.C
POPCORN
WARM
11
HOMEMADE CUSTOM 1
VEGETABLE
BAKERY SET
12
FROZEN
Q
REHEAT 7
ENTREE
DEFROST
13
Figure 27
Figure 29
4 5
6 7
N.C N.C
MORE
TURNTABLE
N.C N.C
ON/OFF
9
N.C N.C
STOP/
4
5
CLEAR
8 0
START
3
N.C Ez Oz
Normal: Approximately
Abnormal: Infinite or several.
1 BK
2 RD
3 WH
7-17
RESULTS
When
touched
Resistance
value
Less than
400 ohms
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
More than
1 mega ohm
1
2
3
4
5
6
7
8
9
10
11
12
13