Nokia NHM-1 Series Troubleshooting Instructions page 28

NHM-1
Troubleshooting instructions
J800-testpoint should look like this ( a 1 MHz sinewave signal ).
Signal amplitude should be near 500 mVpp and DC-offset ca. 0.7 V.
The signal in test points J800 and J801 should have 180 degrees phase shift, because of
balanced operation.
Page 28
Figure 17: J800 test point
Figure 18: J801 test point
Nokia Corporation.
CCS Technical Documentation
Issue 1 11/03