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Front End Control Troubleshooting
A15 Front End Control Assembly Troubleshooting
Figure 5-6 Connector Close-up
To verify the control logic, press Mode Preset on the analyzer. Press FREQ,
5GHz, SPAN, 1MHz, AMPTD, More 1 of 2, uW Path Ctrl. Standard Path is
selected by default. Carefully place the scope probe tip on the conductive
portion where the green wire goes into the connector, see Figure 5-7.
Figure 5-7 Connector Detail
The voltage should be ~21.5 VDC steady state at this point. When you switch
from Standard Path to uW Preselector Bypass, you should see a negative going
pulse to 0 VDC on the oscilloscope for ~15 mS before the voltage returns to
~21.5 VDC steady state. The oscilloscope triggering may need to be adjusted
to see the negative going pulse. This can be tested on both connectors that
contain the green wire.
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