
5. Trouble shooting
- 86 -
5.6 Receiver & Speaker trouble
Check Points
-Speaker spring contact
-Audio amp soldering
-analog switch soldering
0.22u
C447
4.7K
R236
3V3_AUDIO
0
R437
2V72_IO
R439
NA
C236
0.1u
A5
LIN
LOUT
E5
D1
MONO+
B1
MONO-
B5
NC1
NC2
D2
B4
PHONE_IN
RHP3D1
A4
RHP3D2
A3
RIN
D4
D5
ROUT
SCL
B2
SDA
A1
C2
VDD1
VDD2
C3
C4
VDD3
VOC
E2
CBYPASS
GND1
C1
C5
GND2
A2
I2CSPIVDD
I2CSPI_SEL
E1
B3
ID_ENB
D3
LHP3D1
LHP3D2
E3
E4
U210
LM4845
NA
R438
1u
C237
R229
100K
C248
470n
C247
0.1u
3V3_AUDIO
100p
C241
COM1
3
COM2
9
GND
6
4
IN1
8
IN2
NC1
5
7
NC2
2
NO1
10
NO2
1
VCC
NLAS5223BMNR2G
U208
100p
C242
GND
6
4
IN1
8
IN2
NC1
5
7
NC2
2
NO1
10
NO2
1
VCC
U211 NLAS5223BMNR2G
COM1
3
COM2
9
C240
100p
C243
100p
C244
0.1u
4.7K
R237
0
R442
C238
4.7u
0.068u
C250
0.1u
3V3_AUDIO
C251
0
R436
220n
220n
C245
C239
C249
0.068u
AMP_IN_R
AMP_IN_L
BBP_SND_R
FM_BBP_SEL
BBP_SND_L
FM_SND_L
AMP_IN_L
AMP_IN_R
FM_SND_R
SPK_N
SPK_RCV_N
RCV_N
SPK_P
SPK_RCV_P
RCV_P
SPK_RCV_SEL
HS_OUT_L
SPK_P
SPK_N
HS_OUT_R
SDA
SCL
Check signal
flow via
Inductor
Check the contact spring
tension and dust on the
contact point
Check Audio
amp, In output
signal
Check the
analog switchs
Summary of Contents for KE820
Page 1: ...Service Manual Model KE820 Service Manual KE820 Date August 2006 Issue 1 0 ...
Page 3: ... 4 ...
Page 5: ... 6 ...
Page 46: ...3 TECHNICAL BRIEF 47 Figure 18 EN SET port control method ...
Page 69: ...4 PCB layout 70 Figure 45 Main PCB bottom Figure 46 Main PCB bottom placement ...
Page 70: ...4 PCB layout 71 Figure 47 Sub PCB top Figure 48 Sub PCB top placement ...
Page 71: ...4 PCB layout 72 Figure 49 Sub PCB bottom Figure 50 Sub PCB bottom placement ...
Page 114: ...6 Download S W upgrade 115 6 2 Download program user guide ...
Page 115: ... 116 6 Download S W upgrade ...
Page 116: ... 117 6 Download S W upgrade ...
Page 117: ... 118 6 Download S W upgrade ...
Page 124: ... 125 8 PCB LAYOUT ...
Page 125: ... 126 8 PCB LAYOUT ...
Page 126: ... 127 8 PCB LAYOUT ...
Page 127: ... 128 8 PCB LAYOUT ...
Page 141: ... 142 ...
Page 161: ...Note ...
Page 162: ...Note ...