User Guide

ISSUE 1 09/2004 COMPANY CONFIDENTIAL 33
Copyright © 2004 Nokia. All Rights Reserved.
RH-53/54
Nokia Customer Care
■ Troubleshooting chart for the Synthesizer
Figure 21:Troubleshooting chart for synthesizer
From Phoenix chose:
File > product > RH-53/54
Maintenance > Testing > RF controls > band > RX >
continous > channel
Band and channel according to the previous table
Spectrum analyser
VCO frequency (R640)
MHz (see table)
Osciloskope
VXO Power supply
(C618)
2.78Vdc
Osciloskope
VCXO output
(R420) 26MHz
approx. 700mVpp
Osciloskope
VXO Power supply
(C620)
2.78Vdc
Osciloskope
PLL Power supply
(C614, C634)
All 2.7Vdc
Spectrum analyser
VCO output (R640)
some signal between
3 and 4 GHz
PLL block functional
Check UEM, SW
Phone not in function
VCXO is not functional
Check crystal (B600)
Check R605, SW
Phone not in function
Check UEM, SW
Phone not in function
Check Loop filter (R618,
R619, C639-C641)
VCO (G600) is not functional
N600 not functional
Yes
No
No
Yes
No
Yes
No
Yes
No
Yes
Osciloskope
PLL Charge pump
supply
(C616)
All 4.75Vdc
Check R603, C645, UEM,
SW
Phone not in function
No
Yes
YES
No