LG LMV1762SB Service Manual page 33

COMPONENTS
TOUCH KEY BOARD
NOTES:
• A MICROWAVE ENERGY TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS SERVICED FOR
ANY REASON.
• MAKE SURE THE WIRE LEADS ARE IN THE CORRECT POSITION.
• WHEN REMOVING THE WIRE LEADS FROM THE PARTS, BE SURE TO GRASP THE CONNECTOR, NOT
THE WIRES.
TEST
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)
KEY MATRIX
-33-
RESULTS
When
When not
touched
touched
Resistance
Less than
More than
value
1 megaohm
400 ohms
FPC CONNECTOR
Top
2st 1 2 3
8
9
Clear Vent Hi/Low/Off Clock
10
1 2 3
11
7 8 9
12
Sensor Popcorn N.A N.A
13
Start C/T Lamp On/Off Hold Warm
4 5
Energy Saving Add 30 Sec.
4 5
0 Timer
time & weight
Sensor Cook
Defrost
N.A Time Cook