Nokia 3105 Servicehandbuch

RH-48

Troubleshooting - RF

CCS Technical Documentation

Page 36

 ©

2003 Nokia Corporation         Confidential

Issue 1 11/2003

Figure 27 shows the synthesizer block diagram.

Note: See the Schematics chapter for an RH-48 synthesizer schematic.

Following are possible causes for an incorrect UHF frequency:

• Power supplies to Jedi PLL (N601) are missing or low (VR7)

• Loop filter components are missing or incorrectly installed

• Matching components to Jedi TxLO/PLL input are missing or incorrectly installed

• 19.2MHz reference clock is missing or low

• Programming is incorrect

• Component failure (VCO or PLL portion of Jedi)