Nokia RM307, 2505 RF Description and Troubleshooting
Nokia Customer Care
2505 (RM-307)
Mobile Terminal
RF Description and
Troubleshooting
Issue 1 04/2007 Company Confidential © 2007 Nokia Corporation
2505 (RM-307)
RF Description and Troubleshooting
Contents Page
Component Layout ................................................................................................... 3
Tx Troubleshooting................................................................................................... 5
Tx System Block Diagram .................................................................................5
Tx Introduction...................................................................................................6
Main Tx Component ..........................................................................................6
FTM Setup for Tx Troubleshooting ....................................................................7
Tx DC Test Points..............................................................................................8
Tx RF Test Points..............................................................................................9
Tx DC Test Points............................................................................................10
Tx Path Troubleshooting ................................................................................. 11
Rx Troubleshooting ................................................................................................ 12
Rx System Block Diagram...............................................................................12
Rx Introduction ................................................................................................13
FTM Setup for Rx Troubleshooting..................................................................13
Cell Receiver Check from RF to DVGA...........................................................14
Receiver DC Test Points .................................................................................15
Receiver RF Test Points .................................................................................16
Rx Path Troubleshooting .................................................................................17
Page 2 © 2007 Nokia Corporation Company Confidential Issue 1 04/2007
2505 (RM-307)
Nokia Customer Care RF Description and Troubleshooting
Component Layout
Figure 1 and Figure 2 show the main components of the 2505 mobile terminal.
Figure 1: Component layout (Top)
Issue 1 03/2007 © 2007 Nokia Corporation Company Confidential Page 3
2505 (RM-307)
RF Description and Troubleshooting
RF Antenna feed point
RF connector
Front end module
(Duplexer/PA/Coupler)
Rx Saw filter
32.768KHz Crystal
QSC6010 single chip
19.2MHz XTAL
Figure 2: Component layout (Bottom)
Page 4 © 2007 Nokia Corporation Company Confidential Issue 1 04/2007
2505 (RM-307)
Nokia Customer Care RF Description and Troubleshooting
Tx Troubleshooting
Tx System Block Diagram
Front End Module
Figure 3: Tx system block diagram
Issue 1 04/2007 © 2007 Nokia Corporation Company Confidential Page 5
2505 (RM-3
RF Description and
07)
Troubleshooting
Tx Introduction
The QSC6010 (Figure 3) provides the Zero-IF transmit signal path for Cellular-CDMA transmission. For this chipset, Cellular-CDMA refers
to band classes 0 and 3 as defined by the cdma2000 standard, with mobile station transmitters operating between 824 and 925 MHz. The
transmit signal path includes baseband amplifiers, quadrature upconversion, gain control RF amplification, and an output driver amplifier.
The driver amplifier output is routed to the final stages of the transmit chain – power amplifier, direction coupler, duplexer, and antenna.
Main Tx Component
Front End Module
(Duplexer/PA/Coupler)
QSC6010 Single chip
Page 6
Figure 4: Tx components
© 2007 Nokia Corporation Company Confidential Issue 1 04/2007
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