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4. TROUBLE SHOOTING
4.8 Speaker Trouble
4.8 Speaker Trouble
SETTING: Connect PIF to the phone, and Power on. Enter The engineering
mode, and set "Melody on" at Buzzer of BB test Menu
START
Voltage across C235
= 3.3 V?
Yes
Voltage across C238
= 2.8 V?
Yes
Check the signal level of
R234, R236
Yes
The voltage
of R209 is ~2.8V
Check the state of contact of
dual mode speaker
Yes
Speaker
Working!!
No
Check the soldering of
U202
Yes
Re-soldering
U202
No
Check the soldering of
U302
Yes
Re-soldering
U302
No
No
Check the soldering of
U201
Yes
Re-soldering
U201
No
- 58 -
Replace U202
No
( Melody IC
LDO)
No
Replace U302
Replace U200
No
Replace U201
Replace speaker
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