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Flow Chart of Troubleshooting
VBA T
VDD_KEY_O
N
C305
U300
R301
4
1
VI N
VOUT
3
2
EN
GND
C303
KEYPAD
MENU
KEYPAD
KEYPAD
DOWN
KEYPAD
SEND
KEYPAD
KEYPAD
CLEAR
DIGIT1
KEYPAD
KEYPAD
DIGIT2
DIGIT4
KEYPAD
KEYPAD
DIGIT5
DIGIT7
KEYPAD
KEYPAD
DIGIT8
STAR
KEYPAD
KEYPAD
DIGIT0
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LED300
LED301
LED302
LED303
LED304
LED305
UP
OK
KEYPAD
STO
KEYPAD
PWR
KEYPAD
DIGIT3
KEYPAD
DIGIT6
KEYPAD
DIGIT9
KEYPAD
SHARP
9-22
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