Installation guide

Troubleshooting
Getting Started with Troubleshooting
1-3
Getting Started with Troubleshooting
Determine the starting point in Table 1-1 to begin troubleshooting.
• Problems should be worked on in the order they are presented in this table.
• Overviews of Self-Test, Frequency Synthesis, RF Path, Analog Modulation, and Digital Modulation are
found in this chapter. The information in these overviews may help the reader better understand how the
signal generator operates and the function of each assembly. Each overview is also intended to be used to
troubleshoot the signal generator.
Troubleshooting Aids
•semi-rigidcable-extenderprobe
The Agilent E8251-20088 semi-rigid cable-extender probe is used for measuring signals from connectors
that are located inside the A19 Daughterboard card-cage.
• ribbon cable extender
The ribbon cable extender needs to be assembled by the user. It consists of two connector plugs (part
number 1252-1010) and approximately eight inches of ribbon cable (part number 8120-2226). The ribbon
cable contains 26 wires; six of these wires, on either the right or the left side, need to be stripped off before
being connected to the plugs.
Table 1-1
If able to run self-test... Go to this section...
Run Self-Test “Self-Test Failures and Related Troubleshooting” on page 1-19
and refer to the procedure “To Run Self-Test” on page 1-20.
If unable to run self-test,
check...
Go to this section...
Power Supply Failures
A12 CPU Power-on Failures
Front Panel Display
or Keyboard Operations
“ILT-1 Power Supply Failure and Self-Test” on page 1-4
“ILT-2 A12 CPU Power-On Test” on page 1-5
“ILT3 Front Panel Display Troubleshooting” on page 1-9
If other conditions occur... Go to this section...
Unlocked Conditions
Unleveled Conditions
Adjustment Problems
Performance Test Problems
“Troubleshooting Unlocks” on page 1-68
“Troubleshooting Unlevels and the RF Path” on page 1-73
“Troubleshooting Adjustment Problems” on page 1-85
“Troubleshooting Performance Test Problems” on page 1-91