5-7 Key Data Input
Check Initial operation
the pin 1, 3, 5 and 7
one of the keys is pushed,
one of pin 1, 3, 5 and 7 of CN211
Key PCB is OK ?
Flow chart of trouble shooting
Yes
Are
of CN211 low?
Yes
When
is high ?
Yes
Yes
END
No
Replace the PBA
No
Resolder pin 1, 3, 5 and 7
of CN211
No
Replace the Key PCB
5-12