LG KF700Q Service Manual page 127

4. TROUBLE SHOOTING
4.17.4 Checking RF Rx Level
2
ANT ANT
1
GND1 GND1
8
GND2 GND2
10 10
GND3 GND3
23 23
GND4 GND4
24 24
GND5 GND5
GSM850_EGSM_TX GSM850_EGSM_TX
[Fig. 4.26] Schematic of GSM-850, EGSM-900, DCS-1800, PCS-1900 Rx Block
LGE Internal Use Only
FL101 FL101
D5015 D5015
18 18
PCS_RX1 PCS_RX1
19 19
PCS_RX2 PCS_RX2
16 16
PCN_RX1 PCN_RX1
17 17
PCN_RX2 PCN_RX2
14 14
EGSM_RX1 EGSM_RX1
15 15
EGSM_RX2 EGSM_RX2
12 12
GSM850_RX1 GSM850_RX1
13 13
GSM850_RX2 GSM850_RX2
20 20
WCDMA_2100 WCDMA_2100 WCDMA_2100 WCDMA_2100
21 21
WCDMA_850 WCDMA_850 WCDMA_850 WCDMA_850
22 22
WCDMA_1900 WCDMA_1900
9
PCN_PCS_TX PCN_PCS_TX
11 11
[Fig. 4.27] Test Point of Rx Block
- 128 -
C102 C102 2.2p 2.2p
L104 L104
GSM(869-894 MHz) GSM(869-894 MHz)
L101 L101
18nH 18nH
NA NA
TP1
C107 C107 2.2p 2.2p
C110 C110 1.5p 1.5p
L106 L106
L105 L105
GSM(925-960 MHz) GSM(925-960 MHz)
18nH 18nH
NA NA
TP2
C115 C115 1.5p 1.5p
C123 C123 1.8p 1.8p
L108 L108
L109 L109
DCS(1805-1880 MHz) DCS(1805-1880 MHz)
15nH 15nH 3.9nH 3.9nH
TP3
C126 C126 1.8p 1.8p
C128 C128 3p 3p
PCS(1930-1990 MHz) PCS(1930-1990 MHz)
L110 L110 L111 L111
NA NA 3.3nH 3.3nH
TP4
C131 C131 3p 3p
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
RX_GSM_850_M RX_GSM_850_M
RX_GSM_850_P RX_GSM_850_P
RX_GSM_900_M RX_GSM_900_M
RX_GSM_900_P RX_GSM_900_P
RX_DCS_M RX_DCS_M
RX_DCS_P RX_DCS_P
RX_PCS_M RX_PCS_M
RX_PCS_P RX_PCS_P