Note
If the fault is only in low band, the low band microcircuit
(A24) is also a possible cause (RF.2490).
These problems are very dicult to isolate, and require
patience. Often, the quickest and most economical way
to isolate a problem is to substitute modules.
After taking action go to the Troubleshooting Foldout,
block 1 (located just prior to the \Special Cases" tab).
ILT.2650
Perform a full user calibration:
1. Press
4
USER CAL
5
.
2.
Select
N
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
FullUsr Cal
.
If the problem still exists, continue. In general,
troubleshoot harmonics using the block diagram. Go from
the RF OUTPUT (J1) to each of the active RF devices
(A24, A26, A28, A29, A33, A38, A42, for models with
Option 006, and A32, for models capable of
>
26.5 GHz).
Use the ALC menus to help control the level during a
measurement. Pay attention to the bands in which the
1a-46 Instrument Level Troubleshooting Agilent 8360
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