User Guide

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Flow Chart of Troubleshooting and Circuit Diagrams
10-7
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10-1-2.
System Initial
Initial Failure
Check the VCCD_2.8V of
CPU301 is
"
High" When the phon
e
is boot on
check the VCCD_
2.8
of
U701
is
"
High"
LCD display is O.K?
Sound is O.K?
END
Check HDC601 and LCD part
Check Audio part
YES
NO
NO
YES
Check CPU301
Check U701
YES
YES
YES
NO
NO
Voltage at the
R702
is
"
Low-> High"?
NO
Check CPU301 and R702
Check OSC201
There is
32.768
KHz wave
form at the
C223, C224 ?
YES
NO
YES