Uhf Synthesizer - Nokia RH-57 Series Troubleshooting Manual

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UHF Synthesizer

Following are possible causes for an incorrect UHF frequency:
• Orientation of Jedi
• 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)
Figure 29 and Figure 30 show the UHF synthesizer layout.
Figure 29: (Top) PWB. (Bottom left) A zoomed view of the testing points on the UHF synthesizer layout.
(Bottom right) A zoomed view of the UHF synthesizer layout with part numbers.
Issue 1 07/2004
©2004 Nokia Corporation
Troubleshooting - RF
Company Confidential
2112 (RH-57)
Page 39