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4 . TROUBLE SHOOTING
Checking Flow
SETTING : Enter the engineering mode, and set vibrator on at vibration of BB test menu
START
Is the voltage at pin 3
of U401 high?
YES
Is the voltage at pin 1
of U401 high?
YES
Is the voltage at pin 5
of U401 high?
YES
Replace vrbrator
YES
Vibrator
working
NO
Check the soldering
of R315, R399
YES
NO
Check the soldering
of C300
YES
Replace U401
NO
Check the soldering
of C300
YES
Replace U401
- 66 -
NO
Resolder R315, R399
NO
Resolder C300
NO
Resolder C300
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