LG CU920 Manual page 96

4. TROUBLE SHOOTING
4.7.2 Checking WCDMA PAM Control Block
PAM control signal
1. PWR_DET : UMTS Tx Power Detected value (Check R102)
2. TX_AGC_ADJ : UMTS RTR6275 Tx Amp Gain Control
3. +VPWR : UMTS PAM Main Voltage (3V < +VPWR < 4.2V)
4. PA_ON1 : Enable W850 band (C152)
5. PA_ON2 : Enable W1900 band (C168)
6. PA_R1 : Control signals that step the active PA mode and bias
PA_ON1:
W850Enable
(Check C152)
WCDMA Dual
Tx Saw Filter
+ VPWR
LGE Internal Use Only
WCDMA Dual PA M(W850 & W1900)
PA_ON2: W1900 Enable
(Check C168)
Fig. 4.7.2.1 Test point of the WCDMA PAM Block
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W1900
Coupler
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Only for training and service purposes
W850
Coupler