Nokia 6310i Service Manual page 232

NPL-1
6 - Troubleshooting
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Setup with
Phoenix:
Band: GSM 900
Mode: RX Continuous
Channel: 37
Spectrumanalyzer
VCO out (G701) No
f = 3769.6 MHz
VCO
U =2.3..2.8V
tune
Yes
Oscilloscope
Bluetooth Clockbuffer
No
(R601 LPRFCLK_I)
26MHz app. 0.6Vpp
Yes
PLL Block is functional
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3DJH 
BB not working
PLL Synthesiser Fault finding Tree
because 26MHz
missing.
Oscilloscope
VCXO Supply (C607)
Yes
(
VR3=2.78V, VIO=1.8V
VREF1=1.35V)
No
Check supply filter components
Check BB, and Software
Phone not in function
Check Bluetooth
Clockbuffer
R601,R602,R603,
V601,C602
(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.)
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PAMS Technical Documentation
Oscilloscope
VCXO output
Yes
(R425 RFCLK
26MHz,app.0.8Vpp
No
check R618; C425
B601+Mjoelner
Loop filter components?
If ok change Mjoelner
Yes
Wrong writing on RFBus
(see BB part)
Oscilloscope VCO supply
(
VR7 = 2.78V, VR5=2.78V)
VR1A=4.7V
No
Check supply filter components
Check UEM, and Software
Phone not in function
Spectrumanalyzer
VCO out (G701 out)
Some signal 3-4 GHz
No
Change VCO G701
,VVXH  $SULO 
Yes