User Guide

5-13 Flow chart of Troubleshooting and Circuit Diagram
5-7 Key Data Input
Check Initial operation
Replace the PBA
Are
KEYBOARD_ROW(0:4) is "Low" ?
When one of the keys is pushed,
one of KEYBOARD_ROW(0:4) is "High" ?
Replace the PBA
END
No
Ye s
Ye s
Ye s
No