Nokia 3205 Service Manual 10rm11gps
CC Technical Documentation
RM-11 Series Transceivers
Troubleshooting - GPS
Issue 1 02/2004 Confidential ©2004 Nokia Corporation
RM-11
Troubleshooting - GPS CC Technical Documentation
Contents Page
Troubleshooting - Global Positioning System (GPS) Engine........................................ 3
GPS General Block Diagram .......................................................................................3
GPS RF Schematic ......................................................................................................3
GPS Testing .................................................................................................................4
GPS RF Probing Setup ..............................................................................................8
Page 2 ©2004 Nokia Corporation Confidential Issue 1 02/2004
RM-11
CC Technical Documentation Troubleshooting - GPS
Troubleshooting - Global Positioning System (GPS) Engine
The RM-11 handset supports 800 AMPS and 800 CDMA / 1900 CDMA + GPS with
IS 2000 capability. The RM-11 engine supports CDMA and GPS functionality for
Enhanced 911 (E911) services.
GPS circuitry utilizes RF signals from satellites stationed in geosynchronous orbit to
determine the latitude and longitude of the handset. The GPS circuitry and the cellular
engine (CE) circuitry are completely separate in the handset. The GPS circuitry is located
almost exclusively on the secondary side of the PWB, underneath the display module.
GPS General Block Diagram
LNA
Xtal
16.368MHz
IF = 4.092MHz
FilterFilter
AD
C
AGC
Amp
Synthesiser
TRF510
1
GPS RF
Cellular Baseband
Rx
Data
Out
4
Baseband
Ref
Clk
Figure 1: GPS general block diagram
GPS RF Schematic
RF input GPS RF chip (N001)
Filter 1 (Z001)
Filter 2 (Z002)
GPS
Circuits Located on Bottom Layer
Circuits Located on Top Layer
Figure 2: GPS RF schematic
Issue 1 02/2004 ©2004 Nokia Corporation Confidential Page 3
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