Nokia 2220 Servicehandbuch

CCS Technical Documentation

Troubleshooting Instructions

RH-42

Issue 2 09/2003

Nokia Corporation          Confidential

Page 29

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. 

2. Change VCTCXO

Is VCTCXO

oscillating? 19.44MHz

OK!

1. Check voltage at

C792

2.78V

Check resistor R792

OK

1. No

OK

No

OK

2. No