5-8 Service Guide
Power Supply Troubleshooting 8719ET/20ET/22ET
If the Green LED of the Preregulator (A15) Is Off or Blinking 8719ES/20ES/22ES
RF Network Analyzers
If the Green LED of the Preregulator (A15) Is Off or
Blinking
If the green LED is not on steadily, the line voltage is not enough to power the analyzer.
Check the Line Voltage, Selector Switch, and Fuse
Check the main power line cord, line fuse, line selector switch setting, and actual line
voltage to see that they are all correct. Figure 5-4 shows how to remove the line fuse, using
a small flat-blade screwdriver to pry out the fuse holder. Figure 5-2 shows the location of
the line voltage selector switch. Use a small flat-blade screwdriver to select the correct
switch position.
NOTE Refer to “Hardware, Preregulator” on page 13-83 for the correct line fuse
description and part number.
If the A15 green LED is still not on steadily, replace A15.
Figure 5-4 Removing the Line Fuse
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