Tx Vhf - Nokia RH-77 Troubleshooting Manual

2118 (RH-77)
RF Description and Troubleshooting
Figure 31 shows the layout for the Rx VHF.
Figure 31: (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 N601IC 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 (N601 IC)
Note: See the Schematics chapter for the Tx VHF schematic.
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Issue 01 04/2005