User Guide

PAMS
Technical Documentation
RAE-3
8. Troubleshooting
Page 8 – 126
Issue 1 06/01
5.5.3 Troubleshooting diagram for PLL Synthesizer
From WinTesla chose:
Product > Band > EGSM
Testing > RF Controls >
Rx continuous > Ch 60
Spectrum Analyzer
VCO output ( G800 out)
3788 MHz
No
Yes
PLL block functional
Oscilloscope
VCTCXO Power Supply
(G830 Vcc)
2,7 V
Oscilloscope
VCTCXO output
26 MHz,
approx. 0.8 Vpp
VCTCXO is dead
Oscilloscope
VCO Power Supply
(G800Vcc)
Yes
No
Check CCONT
Check CCONT
Spectrum Analyzer
VCO output ( G800 out)
Some signal between 3
and 4 GHz
VCO is dead
Check HAGAR,
wrong writting to HAGAR
(SCLK,SDATA,SLE,
HAGARRESET)
Yes
No
No
Yes
Yes
No
(G830 out)
2.7 V
VSYN_2 = 2.7V
VCHP (C783) = 4.7V
Figure 129.
It is important to say that power supply for VCTCXO ( VXO) is OFF only in
‘Deep Sleep Mode’ and power supply for VCO ( G800 Vcc) is OFF in ‘Sleep
Mode’.