Measurement Points For The Synthesizer - Nokia RH-53 Troubleshooting Instructions
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Also See for RH-53:
- Instructions manual (218 pages) ,
- Manual (38 pages) ,
- Disassembly instructions manual (14 pages)
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RH-53/54
Nokia Customer Care
If the phone stops working a short time after the power is turned ON, a possible reason for this
might be the 26MHz system clock signal is not getting to the UPP clock-input in BaseBand. In
this case check the following:
Turn on the phone and check
VCXO Power supply (C620) = 2.7V
VCXO output (R420 – end not connected to C420) is 26MHz and approx. 700mVpp
If this is not the case check the reference crystal (B600) and Mjolner (N600) as well as R420,
R426, C420, C426.
■
Measurement points for the Synthesizer
Figure 22:Measurement points for Synthesizer
Charge pump Supply C616)
VPLL (C614, C634)
VXO (C620)
VXO (C618)
VCXO Out (R420)
34
COMPANY CONFIDENTIAL
ISSUE 1 09/2004
Copyright © 2004 Nokia. All Rights Reserved.
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