Receiver Troubleshooting - Nokia 2255 Manual
Rm-97, rf description and troubleshooting
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Also See for 2255:
- User manual (54 pages) ,
- Baseband description and troubleshooting (44 pages) ,
- Disassembly/assembly (14 pages)
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Nokia Customer Care
Receiver Troubleshooting
Following is the Rx system block diagram.
LNA SW Control
Antenna
Duplexer
TX
ISSUE 1 10/2005
N7160 IC
CELL
SAW
LNA
RFA
UHF VCO
1052.61-1077.57
UHF Synthsizer
Loop Filter
JEDI
Figure 12: Receiver system block diagram
©2005 Nokia Corporation
I/Q Down
Converter
VGA
IF SAW
IFA
VCTCXO
Company Confidential
2255 (RM-97)
RF Description and Troubleshooting
N7100 IF IC
CDMA
BB Filter
BB AMP
To BB
CDMA
BB Filters
BB AMP
VHF PLL
2 ÷
367.2 MHz
Reference Clock
To Base-Band
AFC
Page 16
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Troubleshooting
