Asus M530w Service Manual page 46

華 碩 電 腦
華 碩 電 腦
through connector (Con6) and T/R switch Pin15 (U902) sequentially. There are
three output pins of T/R switch, including Pin2, Pin4, and Pin5. The output
path which RF signal is transmitted depends on band selection of T/R switch.
In GSM900 band, the output signal which is transmitted from T/R switch
Pin2 passes through SAW filter (BPF1) and matching circuits sequentially.
Upon RF2722 (U901) receiving the signal, it is amplified in the Low Noise
Amplifier (LNA) of the receiver, down converted the signal's frequency and
transformed into IQ signals. The IQ signals from RF2722 Pin20, Pin21, Pin22,
and Pin23 travel to the transceiver RF6001 (U900). The transceiver RF6001
transfers the signals to the baseband signals.
In DCS1800 band, the output signal which is transmitted from T/R switch
Pin5 passes through SAW filter (BPF4) and matching circuits sequentially.
Upon RF2722 (U901) receiving the signal, it is amplified in the Low Noise
Amplifier (LNA) of the receiver, down converted the signal's frequency and
transformed into IQ signals. The IQ signals from RF2722 Pin20, Pin21, Pin22,
and Pin23 travel to the transceiver RF6001 (U900). The transceiver RF6001
transfers the signals to the baseband signals.
In PCS1900 band, the output signal which is transmitted from T/R switch
Pin4 passes through SAW filter (BPF1) and matching circuits sequentially.
Upon RF2722 (U901) receiving the signal, it is amplified in the Low Noise
Amplifier (LNA) of the receiver, down converted the signal's frequency and
transformed into IQ signals. The IQ signals from RF2722 Pin20, Pin21, Pin22,
and Pin23 travel to the transceiver RF6001 (U900). The transceiver RF6001
transfers the signals to the baseband signals.
TSD ■ Lv3Lv4 Repair Manual
46 ASUS Proprietary