Nokia 3105 Servicehandbuch

CCS Technical Documentation

Troubleshooting - RF

RH-48

Issue 1 11/2003

Page 39

Figure 30 shows the layout for the Rx VHF.

Figure 30: (Top) PWB. (Bottom left) A zoomed view of the testing points on the Rx VHF section.

(Bottom right) A zoomed view of the Rx VHF section with part numbers.

Tx VHF

Following are possible causes for an incorrect Tx VHF frequency:

• Power supplies to the PLL portion of Jedi IC (N601) missing or low (VR5)

• Loop filter or resonator components are missing or incorrectly installed

• 19.2MHz reference clock is missing or low (C510)

• Programming is incorrect

• Component failure (Jedi IC)

Note: See the Schematics chapter for a Tx VHF schematic.