Phone Fails After Power On; Measurement Points At The Vcxo - Nokia RH-59 Troubleshooting Instructions

RH-59/60
Nokia Customer Care

Phone fails after power on

If the phone stops working a short time after the power is turned ON, a possible reason for this
could be that the 26MHz system clock signal is not getting to the UPP clock-input in BaseBand.
In this case check the following:
1Turn on the phone and check
2VCXO Power supply (C620) = 2.7V
3VCXO output (R425 – end not
connected to C425) is 26MHz and approx. 700mVpp
If this is not the case check the reference crystal (B600) and Mjolner (N600) as well as R425,
R426, C425, C426.
Measurement points for the VCXO
Figure 47:Figure 22: Measurement point for VCXO supply
Figure 48:Figure 23: Measurement point for VCXO output
50 COMPANY CONFIDENTIAL ISSUE 1 09/2004
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