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Flow Chart of Troubleshooting
9-18
9-7. Key Data Input
Check Initial Operation
Yes
When the END
keys is
pushed, is it
displayed on
Check Key PBA ass"y
& Key Pad
No
Yes
the circuit around
U500
input circuitry
Replace U500
No
Yes
END
Is it a QWERTY
key?
No
When one of the
keys is
pushed, is it
displayed on LCD?
Check the key Fpcb and
QWERTY Dome sheet
No
Yes
Yes
Check
HDC500
Is it
Replace the HDC500
No
Yes
END
Check
VCCD_2.9V=2.9V?
VCCD_1.9V=1.9V?
Check the
QWERTY Dome
sheet & Key Pad
No
Yes
