Nokia 6088, RM-218 Service Manual
Nokia Customer Care
6088 (RM-218)
Mobile Terminal
RF Description and
Troubleshooting
Issue 1 10/2006 Company Confidential © 2006 Nokia Corporation
6088 (RM-218)
Nokia Customer Care 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
Main RX component ........................................................................................13
FTM setup for RX troubleshooting ...................................................................13
Cell Receiver Check from RF to IQ..................................................................14
Receiver DC Test Points..................................................................................16
Receiver RF Test Points ..................................................................................17
Rx path troubleshooting...................................................................................18
Issue 1 10/2006 © 2006 Nokia Corporation Company Confidential Page 2
6088 (RM-218)
g
Nokia Customer Care RF Description and Troubleshooting
Component Layout
Figure 1 shows the main components of the 6088 mobile terminal.
RFAntenna
Direction Coupler
Power Amplifier
Tx Saw filter
RF Transmitter
Power Detector
Cell Duplexer
RF Receiver
Rx Saw filter
Power Mana
ement IC
Issue 1 10/2006 © 2006 Nokia Corporation Company Confidential Page 3
6088 (RM-218)
y
Nokia Customer Care RF Description and Troubleshooting
RF Connector
132.768KHz
stal
Cr
19.2MHz TCXO
Issue 1 10/2006 © 2006 Nokia Corporation Company Confidential Page 4
Figure 1: Component layout
6088 (RM-218)
Nokia Customer Care RF Description and Troubleshooting
Tx Troubleshooting
Tx system block diagram
Figure 2: Tx system block diagram
Issue 1 10/2006 © 2006 Nokia Corporation Company Confidential Page 5
6088 (RM-218)
Nokia Customer Care RF Description and Troubleshooting
Tx introduction
The RFT6122 (Figure 2) 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, isolator, duplexer, and antenna.
Main TX component
Power Amplifier
TX Saw filter
Direction coupler
Cell Duplexer
TX IC
Figure 3: Tx components
Issue 1 10/2006 © 2006 Nokia Corporation Company Confide
Power detector
ntial Page 6
Loading...