E8257D/67D, E8663D PSG Signal Generators Service Guide
Troubleshooting
Getting Started with Troubleshooting
1-2
Handling of Electronic Components and ESD
CAUTION Many of the assemblies in this instrument are very susceptible to damage from ESD. Perform
troubleshooting procedures only at a static–safe workstation, and wear a grounding strap.
Always handle a printed circuit board assembly by its edges. This reduces the possibility of ESD damage
to components, and prevent contamination of exposed plating.
The possibility of unseen damage caused by ESD is present whenever components are transported, stored, or used.
The risk of ESD damage can be greatly reduced by close attention to how all components are handled.
• Perform work on all components at a static–safe workstation.
• Keep static–generating materials at least one meter away from all components.
• Store or transport components is static–shielding containers.
Getting Started with Troubleshooting
Referring to Table 1- 1:
• determine where to begin troubleshooting
• work on problems in the order they are presented in the table
• use the descriptions provided in this chapter that explain how the signal generator operates, and the function of
each assembly: the overall description (page 1- 83), the synthesis loop (page 1- 93), the RF path (page 1- 99), and
self–test (page 1- 121).
Running Self–Test
NOTE A bad assembly can cause other assemblies to fail. The internal failure tree will identify the most likely failed
assembly and report it as the “most independent failure.” Troubleshoot and replace that assembly before
troubleshooting and replacing other assemblies.
When you replace an assembly a good assembly will pass self–test without any adjustments.
1. On the instrument front panel, press the Utility hardkey.
2. Select the following softkeys:
Tab l e 1 - 1
If able to run self–test... Go to this section...
Run Self–Test “Running Self–Test” on page 1- 2 and refer to
“Self–Test Failures and Related Troubleshooting” on page 1- 6.
If unable to run self–test, check... Go to this section...
Power supply failures
A18 CPU turn–on failures
Front panel display or keyboard operations
“Power Supply Troubleshooting” on page 1- 14
“A18 CPU Turn–On Test” on page 1- 3
“Front–Panel Display Assembly Troubleshooting” on page 1- 10
If other conditions occur... Go to this section...
Unlocked Conditions
Unleveled Conditions
Adjustment Problems
Performance Test Problems
“Troubleshooting Unlocks” on page 1- 64
“Troubleshooting Unlevels” on page 1- 67
“Troubleshooting Adjustment Problems” on page 1- 72
“Troubleshooting Performance Test Problems” on page 1- 74
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