4. TROUBLE SHOOTING
- 113 -
4.18.4 Microphone for Main MIC
Main Microphone path as below:
MIC -> C528,C529 -> MSM6250A -> MIC feed back gain logic -> MSM internal CODEC
MIC
3
G3
5
OUT
1
4
PWR
U503
SP0102BE3
2
G1
G2
0
R509
47p
C525
10u
C523
C531
10p
C529
22n
C528
22n
C530
33p
MICBIAS
MIC1N
MIC1P
Near to MSM
0.1u
C228
W15
HPH_R
W17
HPH_L
W18
MICOUTN
AF18
EAR1OP
AF19
AUXIN_AUXIR
AF20
MIC1N
AF22
MICINP
AF24
CCOMP
AE19
AUXIP_AUXIL
AE20
MIC1P
AE22
MICINN
AE23
MICBIAS
AC17
EAR1ON
AC18
AUXON_AUXOR
MIC2P
AC19
AC20
MICFBP
AC21
MICFBN
AA19
MICOUTP
AA17
AUXOP_AUXOL
AA18
MIC2N
C227
22n
22n
C226
MIC2N
MIC2P
M_SPK+
M_SPK-
M_RCV-
M_RCV+
HPL_L
HPL_R
MICOUTP
MICINP
MIC1N
MICINN
MIC1P
MICFBN
MICFBP
MICOUTN
GND_RET
MICBIAS
Start
MIC_BIAS(C525) is 1.8V
Change the Main B'd
NO
Make a call
Can you scoping some
sound signal at C528,C529
Change the MIC
NO
YES
YES
Change the Main B'd
make some sound or
voice to MIC
Work well?
END
YES
NO
Summary of Contents for U890
Page 1: ...Date April 2006 Issue 1 0 Service Manual Model U890 U890c Service Manual U890 U890c ...
Page 3: ... 4 ...
Page 20: ...3 TECHNICAL BRIEF 21 ...
Page 46: ...3 TECHNICAL BRIEF 47 Figure PM6650 2 Functional Block Diagram ...
Page 70: ...4 TROUBLE SHOOTING 71 4 2 SIGNAL PATH ...
Page 109: ...4 TROUBLE SHOOTING 110 CN600 50pin LCD connector CN901 C907 C911 FB901 FB902 ...
Page 115: ...4 TROUBLE SHOOTING 116 C226 C227 for MIC serial capacitor ...
Page 118: ...4 TROUBLE SHOOTING 119 Q400 Q401 Q402 VBATT GND ...
Page 139: ...Table 2 1 1 RF Block Component 6 BLOCK DIAGRAM 140 ...
Page 140: ...6 BLOCK DIAGRAM 141 6 2 Interface Diagram U890 Interface Diagram ...
Page 142: ...6 BLOCK DIAGRAM 143 Top Side ...
Page 143: ...6 BLOCK DIAGRAM 144 Bottom Side ...
Page 152: ... 153 8 pcb layout ...
Page 153: ... 154 8 pcb layout ...
Page 154: ... 155 8 pcb layout ...
Page 155: ... 156 8 pcb layout ...
Page 156: ... 157 8 pcb layout ...
Page 157: ... 158 8 pcb layout ...
Page 163: ...9 CALIBRATION 164 9 3 HOT KIMCHI Example Choose_U890 ...
Page 164: ...9 CALIBRATION 165 Click APPLY button Click START button ...
Page 165: ...9 CALIBRATION 166 Click Run button to lunch RF AUTOTEST ...
Page 167: ... 168 ...
Page 191: ...Note ...
Page 192: ...Note ...