User Guide

CCS Technical Documentation 7 - RF Description & Troubleshooting
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Setup with
Band: GSM 900
Mode: RX Continuous
Channel: 37
Spectrumanalyzer
VCO out (G701)
f
VCO
= 3769.6 MHz
U
tune
=2.3..2.8V
PLL Block is functional
Yes
Oscilloscope
VCXO output
(R425 RFCLK
26MHz,app.0.8Vpp
No
Oscilloscope
VCXO Supply (C607)
(
VR3=2.78V, VIO=1.8V
VREF1=1.35V)
Yes
PLL Synthesiser Fault finding Tree
No
Check supply filter components
Check BB, and Software
Phone not in function
check R618; C425
B601+Mjoelner
No
Oscilloscope VCO supply
(VR7 = 2.78V, VR5=2.78V)
VR1A=4.7V
Yes
Phone not in function
No
Spectrumanalyzer
VCO out (G701 out)
Some signal 3-4 GHz
Yes
Change VCO G701
No
Loop filter components?
If ok change Mjoelner
Wrong writing on RFBus
(see BB part)
Yes
Oscilloscope
Bluetooth Clockbuffer
(R601 LPRFCLK_I)
26MHz app. 0.6Vpp
Yes
Check Bluetooth
Clockbuffer
R601,R602,R603,
V601,C602
No
Check supply filter components
Check UEM, and Software
(For a failure free working of BB the 26MHz clock is necessary!!!)
If the 26MHz clock isn´t work please check first the necessary voltages
VR3;VIO and VREF01. This
can be checked after power on for a time of
about 32sec. After that time the voltages a going down.)
BB not working
because 26MHz
missing.