NHM-8NX
Troubleshooting Instructions
PAMS Technical Documentation
Page 42
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Nokia Corporation
Issue 1 05/02
If the phone stops working a short time after the power is turned ON, a possible reason
forthis might 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 for the PLL
Measurement points at the VCXO
Figure 22: Measurement point for VCXO supply
VCXO Vcc (C620)