User Guide

PAMS Technical Documentation 10. Troubleshooting
NSD-5
Issue 1 05/02 Nokia Corporation Page 29
Test Points
19.2MHz measured at the output of the VCTCXO with a 10 Mohm probe. The figure
below shows the 19.2MHz signals measured by oscilloscope.
Requirements
Trouble Case 1: Tx VHF LO Power < -20dBm
Check the DC level of V508.
DC level of pin 1 > 1V, pin2 0.7 -0.8V, pin 3 > 2V, between Pin 1 and Pin 2 from 0.6 to
0.8V
If not, change V508.
Test Point Signal Name General Characteristics General Signal Destination
C507-R504 AFC VCTCXO control voltage PDM from MAD4
R530-R501 VR1 2.7V supply to VCTCXO CCONT to VCTCXO
C519-C544 19.2MHz 19.2MHz from VCTCXO output VCTCXO output to CAFE and PLL IC’s
C518 Tx VHFLO VHF LO to TIF CELL CDMA 346.2MHz LO from PLL to TIF IC
C517 Rx VHFLO 256.2MHz VHF LO to RIF LO from PLL to RIF
Test Point Signal Name Specification
C507-R504 AFC 1.5 +/- 0.5V
C519-C544 19.2MHz 19.2MHz +/- 150Hz
C518 Tx VHF LO >
-20dBm
C517 Rx VHF LO >
-12dBm
C510 TX UHF LO >
-5dBm
C524 RX UHF LO > -5dBm