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Flow Chart of Troubleshooting
10-8
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10-1-4. LCD Display part
LCD display is abnormal
LCD Backlight is on?
pin#14 of HDC302
is high?
Check LCD
Check HDC302
Check LCD connection
and replace LCD
pin#7 of U404
is high?
C218 > 3.5V?
Check C218
Recharge Bat.
pin#6 of U404
is high?
Check UCP201
CHeck U404
C338, C340 is 2.9V?
Check UCD301
pin#4 of ZD304
is LOW?
Check U400
Are there anysignal
at pin#6 of ZD304?
IS there any
problem at F301,
F302, F303, F304
Replace or resolve
F301, F302, F303, F304
Check U400
NO
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
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②
③
④