LG LG9200 Service Manual page 55

4. TROUBLE SHOOTING
Vibrator Trouble (3)
START
Enter into Engineering Mode
VB401 is connected well ?
Yes
Signal path is O K?
Yes
VIBRATOR signal is High ?
and select Vibrator
No
Re-conne ct Vibr ator
No
Re-solder t he R434,
D401,Q402.
No
MIDI IC is broken.
Replace t he U201.
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Vibrator is out of ord er.
Change the Vibrator.
Yes
No
Rectangular wave(0.7V )
appears at pin2 of Q402?
Yes
Q402 is b roken .
Change the Q402.