Checking Front End Module Block Input Logic - LG AT&T GR500 Service Manual

4.20 Checking Front End Module Block input logic

4.20.1 Mode Logic by TP Command
Mode
EGSM Tx
DCS Tx
PCS Tx
EGSM Rx
DCS Rx
PCS Rx
WCDMA
Parameter
Input Logic Level
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Only for training and service purposes
Antsw0
L
L
L
H
H
H
L
Table 4-1. Front End module(SKY77521) Mode Control Logic
Minimum
Low
High
Table 4-2. SKY77521 Logic Control Levels (TXEN, BS1, BS2)
Antsw1 Antsw2
L H
H H
H H
L H
H H
H L
H L
Typical
-0.3 -
1.2 -
- 133 -
4. TROUBLE SHOOTING
Antsw3
L
L
L
X
X
X
H
Maximum Units
0.55
V
Vbatt
LGE Internal Use Only