Uhf Synthesizer Test Points; Typical Uhf Lo Spectrum Outputs - Nokia 6235 Troubleshooting Manual

6235/6235i/6236i (RM-60)
RF Description and Troubleshooting

UHF Synthesizer Test Points

Typical UHF LO Spectrum Outputs

When analyzing the specturm ouputs, first measure the purity of the UHF LO, then look
at the level offset from the carrier. Also check the VCO, PLL IC, loop filter and power
decoupling. The results in
a high impedance and high spectrum analyzer.
Page 54
Figure 51: UHF synthesizer layout
Figure 52 and
©2005 Nokia Corporation
Figure 53 may be difficult to accomplish without
Company Confidential Issue 1 04/2005