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Only for training and service purposes
5. Trouble shooting
- 78 -
5.7 Microphone trouble
Check Points
-Microphone hole
-MICBIAS & Signal come from
-Audio signal level of the Microphone
-Soldering of components
MICMIC
10u
C322
39p
C321
C317
39p
L302
100nH
MICBIAS
EVLC14S02050
VA300
L304
100nH
C320
22n
100nH
L303
22n
C319
39p
C318
MIC300
SPU0409HE5H-PB
2
G1
G2
3
O
4
P
1
MIC_P
MIC_N
START
Check the signal
level at ( TP1,2)each
side of MIC300.
Check mic. Bias
line
Yes
No
No
Check microphone sound
hole
Replace
microphone
(MIC3
00)
Replace Main PCB
Yes
Mic bias ON
(2.5V)when
call?( TP3,L302)
Yes
TP1
TP2
TP3
TP1
TP3
TP2