Rx Vhf Lo Troubleshooting - Nokia 6235 Troubleshooting Manual
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- User manual (233 pages) ,
- Baseband description and troubleshooting (48 pages) ,
- Disassembly/assembly (12 pages)
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Rx VHF LO Troubleshooting
The VHF LO operates at a fixed frequency of 256.2MHz. It is the second LO for down-
conversion to I and Q for baseband processing. Use the following steps to troubleshoot
the VHF LO.
1. Monitor the test point at C7100. Ensure that a locked and stable 256.2MHz with
amplitude ~ –60dBm is present on the spectrum analyzer (or, with a high
impedance probe, ~ -2dBm at C7104).
2. Monitor the control voltage at C7100. The control voltage at a locked state must
be between 1.2 and 1.7 Vdc for the proper operation of the VHF LO.
Issue 1 04/2005
Figure 55: Rx VHF LO test points
©2005 Nokia Corporation
6235/6235i/6236i (RM-60)
RF Description and Troubleshooting
Company Confidential
Page 57
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