Nokia 6255 サービスマニュアル
Nokia Customer Care
RF Description and Troubleshooting
6255/6255i/6256/6256i (RM-19)
Issue 2 05/2005
©2005 Nokia Corporation Company Confidential
Page 31
Receiver RF Troubleshooting
The heart of the receiver is the N7160 Rx IC, which contains two LNAs and mixers. The
other components are passive. There are two RF SAW filters for the Cell and PCS bands.
In addition, there are two additional IF filters, an IF SAW for CDMA and an IF Crystal for
AMPS. The back-end of the receiver consists of the N7100 IC, which handles the VGA and
IQ demodulator functions.
other components are passive. There are two RF SAW filters for the Cell and PCS bands.
In addition, there are two additional IF filters, an IF SAW for CDMA and an IF Crystal for
AMPS. The back-end of the receiver consists of the N7100 IC, which handles the VGA and
IQ demodulator functions.