Samsung SGH-F480 Servise Manual page 20

Flow Chart of Troubleshooting
9-1-5. Receiver Part (Voice)
No sound from Receiver
YES
Is the terminal of Receiver
OK?
YES
Is the voice signal at pin
#5, #10 of U502?
YES
Is there voice signal at
R527, R529?
END
VBATT_4.2V
R524
SPK_N
1
R527
1S2
EARO_N
2 1S1
SPK2_N
3
VCC
AUDIO_SW
C547
NO
NO
NO
YES
U502
8
GND
2S1 7
2S2 6
R529
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Replace the receiver
Check U502
Check UCP300
AUDIO_SW
SPK2_P
EARO_P
SPK_P
C505
R510
C 01
9-10
C601
L500
L501
C547
TA502
R418