User Guide

RM-11
Troubleshooting - RF (Part 2) CC Technical Documentation
Page 10 ©2004 Nokia Corporation Confidential Issue 1 02/2004
TX VHF Layout
Figure 11: TX VHF Layout
Incorrect TX VHF Frequency
Possible causes:
• Power supplies to PLL portion of Robin IC (N601) missing or low (VR3)
• Loop filter or resonator components missing or incorrectly installed
• 19.2MHz reference clock missing or low
• Programming is incorrect
• Component failure (PLL IC)
RF Probing Point:
Cell: 346.2 MHz @ -6.5 dBm
PCS: 416.2 MHz @-6.5 dBm
Lock Voltage Probing Point:
DC voltage between 1V and 2V
Robin IC with integrated PLL