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Only for training and service purposes
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4. TROUBLE SHOOTING
Loud speaker path as below:
MSM7227 LINE_OP,ON
Æ
C509,C510
Æ
IC500(Audio Subsystem)
Æ
80pin Conn
Æ
Speaker PAD
Start
The sine wave appear at
TP2?
Change the Main board
NO
Connect the phone to network
Equipment and setup call
Setup 1KHz tone out
Set phone with speaker phone mode
or Play the multimedia contents
YES
Check TP1, 80pin Con.
Or Change SUB PCB
NO
YES
Can you hear the tone?
Change the Speaker Module
NO
YES
END
The sine wave appear at
pads of speaker?
4. Trouble Shooting
(BB)
4.13.3 Loud speaker path (voice speaker phone, Multimedia play)
137 P
1u
12
5
C
22n
C509
22n
C510
220n
C508
220n
C507
IC500
D4
C3
B3
B2
C2
C1
D2
D1
A5
A4
5
C
1
B
3
A
S
S
V
D
D
V
D
D
V
P
C1N
C1P
INA2
INA1
INB2
INB1
BIAS
SDA
SCL
1u
10
5
C
LINE_ON
LINE_OP
HPH_L
HPH_R
TP2
TP1
22p
C409
22p
C410
CN401
2
1
SPK_P
SPK_N
Audio Subsystem