Agilent Technologies 83640B - Page 60

d. YO UNLOCK: consider the following, in the order
listed.
i. A6: go to A6.9000.
ii. A5: go to A5.9000.
iii. A13: go to A13.9000.
iv. A26: go to RF.2690.
e. HET UNLOCK: go to RF.2490.
4. The microprocessor may cause the fault, go to
A15.9000.
If these alternatives do not x the problem, use
the instrument block diagram (located behind the
\Troubleshooting Block Diagrams" tab) to troubleshoot
this problem.
ILT.2680
If the problem occurs only at < 2 GHz, it is most likely
the low band (A24). Go to RF. 2490. Otherwise, the
following table shows the three basic types of pulse
problems and their most likely causes:
Failure Mode Most Likely Fault
Rise and Fall Time Amp/Filter (RF.2990) or, for
Opt. 006, pulse mod switched
lter (RF.4290)
Leveling Pulse (A9.9000);
or ALC (A10.9000)
On/O Ratio Dual/modulator (RF.3890) or,
for Opt. 006, pulse mod switched
lter (RF.4290);
Amp/multiplier (RF.2890);
YO (RF.2690);
or poor connections
If these alternatives do not x the problem, use
the instrument block diagram (located behind the
\Troubleshooting Block Diagrams" tab) to troubleshoot
this problem.
1a-48 Instrument Level Troubleshooting Agilent 8360