Nokia 2608 Service Manual page 55

RM-376
RF Troubleshooting
General RF troubleshooting
Introduction to RF
General information on RF
RF key components.....................................................................................................................................................................4-4
General voltage
RF CallTest in Nokia CDMA L3 PST
Receiver troubleshooting..........................................................................................................................................................................4-11
Introduction to receiver (RX)
Setup for RX
Cell Receiver Check from RF to
Receiver RF test
CELL 800 RX Path
Transmitter troubleshooting..................................................................................................................................................................4-16
Setup for TX
Transmitter RF test
CELL 800 TX Path
FM radio troubleshooting.........................................................................................................................................................................4-21
RF tunings ............................................................................................................................................................................................................4-23
Introduction to RF tunings.......................................................................................................................................................................4-23
Autotuning.................................................................................................................................................................錯誤! 尚未定義書籤。
Figure
Figure 1 RF TX Path voltage checking test points ............................................................................................................4-6
Figure 2 Bottom side TX voltage checking test point......................................................................................................4-7
Figure 3 RF RX voltage checking test point........................................................................................................................4-8
Figure4 RF Toolkit setup for RX troubleshooting.............................................................................................................4-12
Figure 5 RX RF test points....................................................................................................................................................4-14
Figure 6 Typical readings.....................................................................................................................................................4-17
Figure 7 RF Toolkit setup for TX troubleshooting............................................................................................................4-18
Figure 8 TX RF test point......................................................................................................................................................4-19
Figure 9 Auto tuning concept with CMU200/Agilent 8960 ..........................................................................................4-24
Issue1
.......................................................................................................................................................................4-2
troubleshooting................................................................................................................................4-2
troubleshooting.............................................................................................................4-2
checking.......................................................................................................................................................4-5
troubleshooting......................................................................................................4-11
Troubleshooting...........................................................................................................................................4-11
DVGA............................................................................................................................4-13
point..............................................................................................................................................................4-13
Troubleshooting...............................................................................................................................4-15
Troubleshooting...........................................................................................................................................4-18
point......................................................................................................................................................4-19
Troubleshooting................................................................................................................................4-20
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Table of Contents
Fx.x.............................................................................................................................4-9
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