Checking Front End Module Block Input Logic - LG TU750 Service Manual

4. TROUBLE SHOOTING

4.19 Checking Front End Module Block input logic

4.19.1 Mode Logic by TP Command
Mode
G850/EGSM Tx
DCS/PCS Tx
G850 Rx
EGSM Rx
DCS Rx
PCS Rx
WCDMA850
WCDMA1900
Table 4-1. Front End module(SKY77521) Mode Control Logic
Parameter
Input Logic Level
Table 4-2. SKY77521 Logic Control Levels (TXEN, BS1, BS2, MODE)
LGE Internal Use Only
Antsw0 Antsw1
L L
L H
H L
H L
H H
H H
L L
L H
Minimum
Low -0.3
High 1.2
- 142 -
Antsw2
H
H
L
H
H
L
L
L
Typical Maximum
- 0.55
- Vbatt
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Only for training and service purposes
Antsw3
L
L
X
X
X
X
H
H
Units
V