LG U310 Service Manual page 83

4. TROUBLE SHOOTING
4.5.4 Checking PAM Block
• PAM control signal
PA_ON : WCDMA Tx Power Detect IC(HDET) Enable
TX_AGC_ADJ : WCDMA Tx Power Amp Gain Control
PA_ON
TX_AGC_ADJ
PA_ON must be HIGH(over 2.5V)
PA_FET_N must be LOW if the max Tx power is set (lower than 0.5V)
PAM IN/OUT Signal
PAM_IN
PAM_OUT
PAM OUT must be over 16dBm / PAM IN must be over -5dBm
- 84 -