Agilent Technologies 8590L Service Manual page 240

Verify the ground reference detector
This service-diagnostic routine verifies the ground reference circuitry
on the A16 processor/video board.
Figure 4-8 Ground Reference Detector
Chapter 4
Verify the ground reference by pressing
• If the signal trace is at the bottom of the display, the ground
reference is functioning properly. See
• If the signal is not at the bottom of the display, the problem is
isolated to the A16 processor/video board assembly. Refer to
"Troubleshooting the A16 Processor/Video Board Assembly"
located in this chapter for further troubleshooting.
Troubleshooting the Analyzer
Using the Internal Service-Diagnostic Routines
.
GND REF
Figure 4-8.
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