Tx Vhf Layout; Incorrect Tx Vhf Frequency - Nokia RM-11 Series Troubleshooting Manual

RM-11
Troubleshooting - RF

Tx VHF Layout

R F probing point:
C E LL: 346.2MHZ @ -6.5dBm
PC S : 416.2 MHz @ -6.5dBm
Lock voltage
Probing point
DC voltage betw een 1 and 2 V

Incorrect Tx VHF Frequency

Possible causes:
• Power supplies to PLL portion of N601 IC missing or low (VR3)
• Loop filter or resonator components missing or incorrectly installed
• 19.2MHz reference clock missing or low (G513)
• Programming is incorrect
• Component failure (PLL IC)
© 2005 Nokia Corporation
Page 40
CC Technical Documentation
Confidential
N601 IC with
integrated PLL
N601 IC with inte-
grated PLL
Issue 2 09/2005