3. TECHNICAL BRIEF
- 30 -
(2) Key Backlight Illumination
There are 6 blue LEDs for key backlight illumination which are driven by KEY_BACKLIGHT
signal from AD6525.
Figure 3-16 Circuit Diagram of key backlight illumination
KEY BACKLIGHT
VBAT
VBAT
VCHARGE
LE
BB
-S
14H
R3
0
5
47
$V
$V
$V
$V
$V
$V
$V
$V
$V
$V
$V
$V
$V
$V
LD3
00
C319
27p
LE
BB
-S
14H
R3
0
6
47
$V
$V
$V
LD3
01
C320
27p
LE
BB
-S
14H
R3
0
7
47
$V
$V
$V
LD3
02
C321
27p
LE
BB
-S
14H
R3
0
8
47
$V
$V
$V
LD3
03
C322
27p
LE
BB
-S
14H
R3
0
9
47
$V
$V
$V
LD3
04
C323
27p
LE
BB
-S
14H
R3
1
0
47
$V
$V
$V
LD3
05
C324
27p
R3
1
3
1.
5K
R3
1
5
10
0
K
Q3
0
1
IM
X
9T
10
R3
1
7
15
RPWRON
0
1
3
2
10
K
R316
0
R312
U302
MAX4599EXT-T
6
4
NO
NC
VC
C
IN
GN
D
COM
C318
0.1u
C3
1
7
0.
1u
R3
1
4
4.
7K
R3
1
1
KEY_BACKLIGHT
3.11 Microphone
The microphone is placed to the front cover and is connected to main PCB. The audio
signal is passed to VINNORP and VINNORN pins of
AD6521
. The voltage supply 2V55_VAN
is output from ADP3522, and is a bias voltage for the VINNORP.
The VINNORP and VINNORN signals are A/D converted by the Voiceband ADC part of
AD6521. The digitized speech is then passed to the DSP section of AD6525 for
processing (coding, interleaving etc).
2
1
R2
1
0
2K
VA202
VA203
0.1u
C220
39p
C222
1K
R2
0
8
SP202
R215
2K
SP203
C221
39p
2V55_VAN
R211
R214
R240
0
100
100
C216
39p
C250
10u
C217
10u
C219
39p
(1608)
VINNORP
VINNORN
MIC200
OB4-15L42-C33L
CLOSE TO MIC
Figure 3-17 Circuit Diagram of Microphone
Summary of Contents for G1610
Page 1: ...Service Manual Model G1610 Service Manual G1610 P N MMBD0045701 Date February 2005 Issue 1 0 ...
Page 52: ...4 TROUBLE SHOOTING 51 Graph 4 14DCS TX Graph 4 15EGSM TX VC1 VC2 VC1 VC2 VC1 VC2 VC1 VC2 ...
Page 70: ...5 DISASSEMBLY INSTRUCTION 69 5 DISASSEMBLY INSTRUCTION Figure 5 1 Figure 5 2 ...
Page 71: ...5 DISASSEMBLY INSTRUCTION 70 Figure 5 3 Figure 5 4 ...
Page 72: ...5 DISASSEMBLY INSTRUCTION 71 Figure 5 5 ...
Page 73: ...5 DISASSEMBLY INSTRUCTION 72 Figure 5 6 1 3 2 4 Figure 5 7 1 2 3 ...
Page 74: ...5 DISASSEMBLY INSTRUCTION 73 Figure 5 8 4 2 3 1 2 1 Figure 5 9 ...
Page 75: ...5 DISASSEMBLY INSTRUCTION 74 Figure 5 10 ...
Page 86: ...7 BLOCK DIAGRAM 85 7 BLOCK DIAGRAM Power supply ...
Page 87: ... 86 ...
Page 108: ...12 AUTO CALIBRATION 107 12 3 Equipment Setup Figure 12 1 Equipment Setup ...
Page 111: ...12 AUTO CALIBRATION 110 ...