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LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4.5.3 Checking RF Rx Block
TP1. GSM850 Rx Input
TP2. GSM900 Rx Input
TP3. PCS Rx Input
TP4. DCS Rx Input
4. TROUBLE SHOOTING
- 82 -
TP1
TP2
TP3
TP4
(1%)
11.4dB
(1%)
C88
56p
C94
12p
L113
56nH
L122
NA
0.5p
C99
12p
C98
L108
5.1nH
C85
NA
5.1nH
L105
C90
6p
82
R108
L118
NA
47nH
L114
22u
C112
C111
100p
WLNA_IN
26
56
VCONTROL
LB_RF_OUT
RF_ON
24
3
R_BIAS1
27
R_BIAS2
14
SBDT
54
39
DCS_INN
DCS_INP
38
33
EGSM_INN
EGSM_INP
32
ENV_OUT
55
30
GCELL_INN
31
GCELL_INP
37
GPCS_INN
GPCS_INP
36
46
HB_RF_OUT
44
HB_RF_OUT
LB_RF_OUT
43
42
23
CAL_INN
CAL_INP
22
DAC_REF
5p
C92
NA
C93
R111
82
R104 12K
L107
12nH
L116
27nH
22nH
L110
C89
6p
27nH
L119
R105
680
L101
12nH
1.2p
C101
4.7nH
L120
C100
56p
L100
4.7nH
82
R110
47nH
L117
12
GND4
GND5
13
TX_EN
3
4
11
2
BS
DCS_PCS_IN
1
14
DCS_PCS_OUT
NA
L102
L112
1.5nH
1
GSM1800RX1
GSM1800RX2
2
22
SM1800_1900TX
3
GSM1900RX1
GSM1900RX2
4
GSM850RX1
7
8
GSM850RX2
GSM850_900TX
25
5
GSM900RX1
GSM900RX2
6
NC
17
UMTS1
15
16
UMTS2
00
MA-573TEMP
1.8nH
L109
56p
L111
4.7nH
L104
22nH
L115
GSM_PA_BAND
WCDMA_1900
WCDMA_850
+VPWR
GSM_PA_EN
DCS_PCS_TX
TX_AGC_ADJ
DAC_REF
SSBDT_RTR
WCDMA_1900_TX_OUT
DCS_PCS_TX
GSM_TX
WCDMA_850_TX_OUT
TX_ON
Schematic of GSM850/GSM900/DCS/PCS Rx Block
TP4
TP1
TP2
TP3
Summary of Contents for CU405
Page 1: ...Date May 2007 Issue 1 0 Service Manual Model CU405 Service Manual CU405 Internal Use Only ...
Page 175: ...Note ...
Page 176: ...Note ...