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7. Flow Chart of TroubleShooting
7-1
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7-1 Logic Section
7-1-1 Power On
Insert Power
power on
properly?
U203
pin41=high?
C219 =
2.7V?
C172
19.2MHz?
END
Check Phone power on section
Check CON203 and it's
neighboring circuits
Check
C220,C222,C223,C224,C225,C226
and U203's neighboring circuits
Check OSC302,U107 and it's
neighboring circuits
YES
YES
YES
YES
NO
NO
NO
NO