Service Guide E8364-90038 4-7
PNA Series Microwave Network Analyzers Troubleshooting
E8362C, E8363C, E8364C Power Up Troubleshooting
Power Supply Check
NOTE There are no fuses to replace within the power supply. If you determine that the power
supply is the failed assembly, replace the power supply.
A catastrophic failure in the power supply can be determined by observing the line switch:
1. Ensure that the instrument is plugged in with the power switch in the standby position (power not
switched on). Verify that the line switch glows yellow. A line switch that glows yellow indicates that the
+15 VDC line (P15 STB) is providing enough voltage to light the LED. (The actual voltage may not be +15
VDC.)
2. Turn on the instrument power and verify that the line switch glows. When the line switch glows, it is an
indication that the power supply has received an “ON” command and that the +5.2 VDC supply can
supply enough current to light, at least, these lamps.
If these supply voltages are missing, it is likely that the problem is either a defective A4 power supply, or
another assembly is loading down the A4 power supply. Continue with “If All Supply Voltages Are Missing”
on page 4-9, to determine the cause of the problem.
If the line switch is lit correctly, the power supply has not suffered a catastrophic failure; however, the power
supply could still be at fault. Continue with the next section to measure the individual voltage supplies.
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