Chapter 5 5-17
Power Supply Troubleshooting
Error Messages
Error Messages
Three error messages are associated with the power supplies functional group. They are
shown here.
• POWER SUPPLY SHUT DOWN!
One or more supplies on the A8 post regulator assembly is shut down due to one of the
following conditions: overcurrent, overvoltage, or undervoltage. Refer to “If the Red
LED of the A15 Is ON” on page 5-8.
• POWER SUPPLY HOT
The temperature sensors on the A8 post regulator assembly detect an overtemperature
condition. The regulated power supplies on A8 have been shut down.
Check the temperature of the operating environment; it should not be greater than
+55 °C (131 °F). The fan should be operating and there should be at least 15 cm (6 in)
spacing behind and all around the analyzer to allow for proper ventilation.
• PROBE POWER SHUT DOWN!
The front panel RF probe biasing supplies are shut down due to excessive current draw.
These supplies are +15 VPP and −12.6 VPP, both supplied by the A8 post regulator.
+15 VPP is derived from the +15 V supply. −12.6 VPP is derived from the −12.6 V
supply.
Refer to Figure 5-7 and carefully measure the power supply voltages at the front panel
RF probe connectors.
Figure 5-7 Front Panel Probe Power Connector Voltages
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