Agilent Technologies Portable Generator Agilent Technologies Portable Generator User Manual

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Chapter 5 Service
Troubleshooting Hints
103
5
Bias Supplies Problems
Check that the input to the voltage regulators of the bias supplies is at least
1 V greater than their output.
Circuit failures can cause heavy loads of the bias supplies which may pull down
the regulator output voltages.
Check the voltages of bias supplies as tabulated below.
Table 5-1. Bias Supplies Voltages
Some circuits produce their own local bias supplies from the main bias
supplies. Be sure to check that these local bias supplies are active. In particular,
the ADC (analog-to-digital converter), ac input, and front panel sections have
local bias supplies. Always check that the power supplies are free of ac
oscillations using an oscilloscope. Failure of bias supplies will cause many self-
test failures.
Bias Supply Minimum Maximum Check At
+5V Floating +4.75 V +5.25 V U10 pin 2
-5.1V Floating -4.75 V -5.25 V Anode of CR6
+15V Floating +14.25 V +15.75 V Anode of CR9
-15V Floating -14.25 V -15.75 V Cathode of CR10

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