Only For Training And Service Purposes - LG CU720 Service Manual

4.8.3 Checking Rx Block
1. TP1 : GSM850 Rx Balance Input
2. TP2 : GSM900 Rx Balance Input
3. TP3 : PCS Rx Balance Input
4. TP4 : DCS Rx Balance Input
FL101
LMSP4LMA-573TEMP
1
GSM1800RX1
2
GSM1800RX2
3
GSM1900RX1
4
GSM1900RX2
5
GSM900RX1
6
GSM900RX2
7
GSM850RX1
8
GSM850RX2
15
UMTS1
16
UMTS2
22
GSM1800_1900TX
25
GSM850_900TX
17
NC
Copyright © 2007 LG Electronics. Inc. All right reserved.

Only for training and service purposes

[Fig 4.8.3.1] Test point of the GSM RX Block
[Fig 4.8.3.2] Schematic of the GSM RX Block
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4. TROUBLE SHOOTING
TP1 TP2 TP3
DCS
L101
TP4
L104
0.5p
L106
PCS
L107
C104
TP3
100nH
L108
EGSM
L111
TP2
L114
NA
rev.1.0.2
L115
GSM850
L116
TP1
L119
NA
L120
TP4
5.6nH
5.6nH
5.6nH
rev.B
5.6nH
22nH
rev.1.0.2
L112
47nH
22nH
rev.1.0.2
22nH
22nH
LGE Internal Use Only