ILT.2020
There is a high-loss path between the directional coupler
(A39) and the sampler (A6). This path includes two
hard lines (W54, W51), a low pass lter (FL2), and
an attenuator (AT3). The most likely failure is a poor
connection. Correct the faulty connection or replace the
faulty part (W54, FL2, W51, AT3). Isolate and replace the
faulty component and go to the Troubleshooting Foldout,
block 1 (located just prior to the \Special Cases" tab).
To check for excessive loss in a cable or lter, connect
the component input to a known-good signal for the
frequency bands in question (see the block diagram
located behind the \Troubleshooting Block Diagrams" tab)
and test the output. Over the frequency range of 2.0 to
8.0 GHz, the loss for a coaxial cable should be

2.0 dB;
the loss for a lter should be

4.0 dB.
ILT.2030
The most likely cause of this failure is A26, the YIG
oscillator (go to RF.2690). If replacing A26 does not
resolve the problem, it is possible (but less likely) that
A13, the YO driver assembly could be the cause.Goto
A13.9000 to replace A13.
1a-26 Instrument Level Troubleshooting Agilent 8360
To Next Page
Loading...
Need help?
General
