Fault-Finding Chart For Rx Vhf Vco; Tx Vhf - Nokia RH-42 Troubleshooting Instructions

RH-42
Troubleshooting Instructions

Fault-finding chart for RX VHF VCO

3. Replace Taco

TX VHF

The TX VHF signal is used to generate transmitter Intermediate frequency. TX VHF VCO
has one fixed frequency (361.08). Operating frequency is locked in Phase locked loop. TX
VHF VCO output signal is divided by 2 and fed to the modulator.
3. Replace Taco
Page 30
1. START HERE
Is frequency locked to
OK
271.08MHz?
2. No
1. No
2. Check resonator
components:
L730, C740, C741,
R741
Figure 15: Fault tree:
1. START HERE
Is frequency locked to
OK
361.08MHz?
2. No
1. No
2. Check resonator
components:
L746, C720, C721,
R721
Figure 16: Fault tree: TX VHF
Nokia Corporation
CCS Technical Documentation
Yes
OK
RX VHF
Yes
OK
Confidential
OK
OK
Issue 2 09/2003