(1) Checking PAM Control Signal
4. TROUBLE SHOOTING
- 84 -
TEST POINT
CIRCUIT
U501
R502(PAM_EN)
R515(TX_RAMP)
Figure 4-16.
3dB ATTEN
(PA)
2dB ATTEN
(GPO_16)
430
R512
R513
430
10K
R515
R508
300
GSM_IN
11
GSM_OUT
21
PGND
19
RSVD_GND
VAPC
20
17
VBATT
2
VCC1A
6
VCC1B
BS
1
DCS_PCS_IN
3
15
DCS_PCS_OUT
ENABLE
18
GND1
5
GND2
7
8
GND3
GND4
9
10
GND5
GND6
12
13
GND7
GND8
14
GND9
16
4
SKY77328
U501
R514
0
10p
C512
18
R507
33p
C509
2V8_VEXT
R510
12
1000p
C508
C519
27p
0.01u
C513
300
0.01u
R509
C514
0
R502
TX_RAMP
PA_EN
CIRCUIT
Go to Next Step
Similar?
Yes
No
Check TX_RAMP and PA_EN
Check if there is
Any Major Difference or not
Go to Next Step
Similar?
Yes
No
Go to Next Step
Similar?
Yes
No
Redownload S/W
Check TX_RAMP and PA_EN
Check if there is
Any Major Difference or not
Refer to Graph 6
Figure 4-17.
Figure 4-18.
WAVEFORM
Graph 4-6.
Содержание KG920
Страница 3: ... 4 ...
Страница 48: ...3 TECHNICAL BRIEF 49 3 8 2 AFE Analog Front End Figure 3 22 ...
Страница 52: ...3 TECHNICAL BRIEF 53 3 8 5 MBGM01 5M CCD ISP Figure 3 25 ...
Страница 55: ...3 TECHNICAL BRIEF 56 3 8 6 MV8620 5M back end IC Multi Media Function Figure 3 26 ...
Страница 58: ...3 TECHNICAL BRIEF 59 3 9 MIDI IC YMU787 Figure 3 27 YMU787 BLOCKDIAGRAM ...
Страница 87: ...4 TROUBLE SHOOTING 88 Graph 4 8 BLUE RST Graph 4 9 DEBUG_TX RX Graph 4 10 PCM_SYNCS TX RX USC0 ...
Страница 96: ...4 TROUBLE SHOOTING 97 4 7 KEY backlight Trouble TEST POINT Q101 R122 Q101 LD101 LD119 Figure 4 38 Figure 4 39 ...
Страница 108: ...4 TROUBLE SHOOTING 109 CIRCUIT WAVEFORM Figure 4 59 Graph 4 11 Figure 4 60 Figure ...
Страница 109: ...4 TROUBLE SHOOTING 110 TEST POINT U602 FB602 U100 Q100 Q101 C113 C114 Figure 4 61 Figure 4 62 ...
Страница 111: ...Figure 4 65 Graph 4 12 4 TROUBLE SHOOTING 112 C102 C113 U101 Figure 4 66 C137 U103 TEST POINT WAVEFORM ...
Страница 112: ...4 TROUBLE SHOOTING 113 Figure 4 67 Figure 4 68 CIRCUIT ...
Страница 115: ...4 TROUBLE SHOOTING 116 WAVEFORM Graph 4 13 ...
Страница 139: ...6 BLOCK DIAGRAM 140 6 BLOCK DIAGRAM Figure 6 1 ...
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