Service Manuals, User Guides, Schematic Diagrams or docs for : LG Mobile Phone LG B1200 LG B1200 2
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7. Block Diagram
7. Block Diagram
1) BaseBand Section
- 50 -
7. Block Diagram
2) RF Section
- 51 -
8. CIRCUIT DIAGRAM
8. CIRCUIT DIAGRAM
A B C D E F G H I J
1 3 ACTIVE CIRCUITRY:
VRF2
47k VRF2
TXVCO_ON
10k
Q603
DTA114YE R634
L613
100n
Main VCO C668 C662 Synthesizer TX Main PLL + Main VCO
Aux PLL + Aux VCO U601B
47
46
45
2k7 27p 100n PTRF6150
3
Offset PLL + TX/RX VCO
2
C601 C660
DETD
DETR
FILT
2 Z601 RX Main PLL + TX/RX VCO
L614 Q602 C621 C657 LDB25D500A0013A
8 R601 6n8 5p6 6p8 BFR505T 27p 33p 48 VAPC 8
220R R619 5 L 2
1
6k8
1
7 H 8 vhome
C602 L601 C622 R638 I
1n
NC
NC
GND
C604 2n7 2p7 68R C658
GND
D601 Vcc3 LPF
4n7-5% HVC369B 33p
9 APCEN
ECHU
2
1
4
6
3
8 APC
R637 C632
100R 5p
C623 C605 VRF3
2p7 27p
R612 C617
Transmitter
0402-R-Short 27p
C603
33n-5%
ECHU
7 U603 7
R602 R603
Main 34
54
53
OMIXrf 51
LBswitch 64
C669 R613 R614 RF3110
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
4
MAINcp 5
HBswitch 1
TXRXswitch 2
1k2 680R n.m 1k2 1k5
C665 C666 C667 C664 R616
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
VCC2_DCS_PCS GND
GND
GND
GND
VCO
MainSPUP1
RX1op
RX1on
U601D 120p n.m n.m 100n 6R8
TX_1800
10
11
PTRF6150 1 11
8
9
DCS_PCS_IN DCS_PCS_OUT
1
3
S
4
TX_ON
HB_ON
LB_ON
RX
Vcc
Main R3 60 R615A R615B 7 9
VCC2_GSM
HB GSM_IN GSM_OUT
VCC_OUT
PLL RX R609 33R R610 33R TX 6 680R 680R
TXRXcp 59
VRAMP
13
PA_EN
VBATT
CTRL
B_SW
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