Key Matrix - Sears 721.80802400 Manual

KEY MATRIX

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 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)
Start Add 30
Enter Popcorn
N.C
Kitchen
N.C
Timer
Clock Light
7-18
RESULTS
When
touched
Resistance
value Less than More than
400 ohms 1 mega ohm
FPC CONNECTOR
Top
When not
touched
1
2
3
4
5
6
7
8