Checking Rf Tx Level - LG KS20 Operating Instructions Manual

4.7.1 Checking RF Tx level

4.7.2 Schematic of RF Tx level
ANT500 ANT501
R500
0
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
TP1
SW500
L500 C502 KMS-506
G2
ANT RF
G1
3.9nH
4.7p
C505 C506
ENWY0002301
1.5p NA
Rev.F
FL500
LSHS-M090UE
14
ANT_SEL0 VC1
15
ANT_SEL1 VC2
16
ANT_SEL2 VC3
1
GND1
2
GND2
C514 C515 C516 4
GND3
33p 33p 33p
5
GND4
8
GND5
10
GND6
12
GND7
17
GND8
18
GND9
25
PGND1
26
PGND2
SFAY0010001
ANTENNA SWITCH MODULE LOGIC
ANT_SEL0 ANT_SEL1 ANT_SEL2
GSM 850/GSM 900 TX HIGH HIGH LOW
HIGH LOW LOW
GSM 1800/GSM 1900 TX
GSM 850 RX - -
GSM 900 RX LOW LOW LOW
GSM 1800 RX LOW LOW LOW
GSM 1900 RX LOW LOW HIGH
WCDMA HIGH LOW HIGH
GSM
4. TROUBLE SHOOTING
C503
L501
VRF_SMPS
15nH
33p
L502
C509
100nH
0.1u
11
ANT
13
VDD
7
NC
3
DCS_PCS_TX
6
EGSM_TX
9
UMTS_TX_RX
19
DCS_RX2
20
DCS_RX1
21
PCS_RX2
22
PCS_RX1
23
EGSM_RX2
24
EGSM_RX1
-
TP2
VBAT
C539
C540
TP3
4.7p 33p
L512
2.2nH
L513
C541
6.8nH
15p
L514
12nH
- 97 -
DCS(1805-1880 MHz)
PCS(1930-1990 MHz)
GSM(925-960 MHz)
GSM_PA_BAND MODE
LOW GSM
DCS/PCS
HIGH
C533
C53
C534
100p
68p
22u
(1608)
TQM7M5008
14 1
GND6 DCS_PCS_IN
13 2
GND5 BS
12 3
VCC TX_EN
U501
11 TQM7M5008 4
GND4 VBATT
10 5
GND3 GND1
9 6
GSM_OUT VRAMP
8 7
GND2 GSM_IN
LGE Internal Use Only