RH-18/38 Company confidential
CCS Technical Documentation
Page 48 Nokia Corporation. Issue 1 10/03
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:
1 Turn on the phone and check
2 VCXO Power supply (C620) = 2.7V
3 VCXO 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 at the VCXO
Figure 22: Measurement point for VCXO supply
Figure 23: Measurement point for VCXO output
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