Rx Vhf - Nokia RH-41 Series Troubleshooting Instructions

RH-41
Troubleshooting Instructions
2. Change VCTCXO

RX VHF

The RX VHF signal is used to generate receiver Intermediate frequency. RX VHF has one
fixed frequency 271.08 MHz. Operating frequency is locked in Phase locked Loop.
RX VHF PLL output signal is integrated in Taco. There are only four external components:
VCO coil (L730), and loop filter components C740, C741, and R741.
Page 34
START HERE!
Is VCTCXO
OK
oscillating? 19.44MHz
2. No
1. No
1. Check voltage at
C792
2.78V
Check resistor R792
Figure 16: Fault tree: 19.44 MHz oscillator
Nokia Corporation
CCS Technical Documentation
OK
No OK
Confidential
OK!
Issue 2 09/2003