Samsung SGH-i700 Service Manual page 10

5. Microphone Phone
MicropHone does not work
check the connection
Audio loopback is
enabled by board test
R449, R451 ≒ 2.2 V
Check the pin 22,23 of
U403 != Sine Wave
33U F
EAR _M I C P
BAT33 BAT33
R 45 2 R 453
20K 1K
Q 401
3
2
1
R 45 4
10K
Yes
No
from CN604
Yes
No
program.
Yes
No
Yes
END
AU D I O 3 3
AU D I O 3 3
R 450
680
R 40 6
68 0
C 470
33U F
C 42 6
6. 3V
AG N D AG N D
R 451
4. 7K, 1 %
AG N D
C 482
220N F
C 483
1N F
AG N D AG N D
SEN D _EN D
AU D I O 33
C 459
100N F
AG N D
nR C V_EN
AG N D
SAM SU N G Pr opr i et ar y- C ont ent s m ay change w i t hout not i ce
This Document can not be used without Samsung's authorization
SGH-I700 Flow Chart of Troubleshooting
Change Main Key F-PCB
Resolder R449, R451, R406, R450
Hardware Reset or Resodering or
Download Image
C 46 5
L402
1U F
1u H
M I C P
C 46 7
N C
R 449
4. 3K, 1 %
AG N D
C 469
N C
L401 1u H
C 422 10U F
H PO U TR
JAC K_S
C 421 10U F
H PO U TL
AG N D AG N D AG N D
N C _G N D
SPK G N D
EAR - M I C PAR T
N C w hen PI N 1 BE LO W
U 408
1 6
I N N O
2 5
V+ C O M
N C _G N D
3 4
G N D N C
AG N D
2-7
M I C +
C 466
N C
AG N D
M I C -
R 428
C 460
0 180PF
AU D I O 33
AG N D
R 45 6
100K
EAR 401
7
5
6
4
3
2
1
AG N D
R 43 1 N C
R 402 0
R 403 N C
R 405 0
R 45 5 0
AG N D