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LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
- 114 -
4.16 Speaker phone path
MSM6280 HPH_L
→
Audio AMP
→
connector
→
Speaker
Start
Connect the phone to network
equipment and setup call
Setup 1KHz tone out
Sine wave appears at
R308 and R309
Check R308/R309 or
Change the Main board
NO
Connecting speaker OK?
Re-connect speaker
NO
Can you hear the tone?
Change the speaker
NO
YES
END
YES
RCV_EN: 0 --> NC, 1 --> NO
SELECT_SPK&RCV
3
COM1
9
COM2
6
GND
IN1
4
IN2
8
5
NC1
NC2
7
NO1
2
NO2
10
VCC
1
U301
NLAS5223BMNR2G
10
R309
10
R308
C314
0.1u
TP310
RCV_EN
+VPWR
RCV+
RCV-
SPK_RCV-
LOW: SHDN
Audio AMP
8200p
C318
1K
R304
C321
1u
R306 51K
FB300
HB-1M1005-600JT
R312
100K
A2
GND1
GND2
A3
B3
GND3
GND4
C2
C3
GND5
GND6
D2
D3
GND7
C1
IN+
D1
IN-
B1
NC
VDD1
B4
VDD2
C4
D4
VO+
A4
VO-
_SD
A1
10u
U300
TPA2005D1ZQYR
C320
22n
C315
51K
R305
22n
C319
HPH_L
SPK_AMP_EN
+VPWR
SPK_RCV-
R308
R309
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