Section 9: Troubleshooting
Model 2290-5 5 kV Power Supply User's Manual
9-2
2290-5-900-01 Rev. A/December 2013
Incorrect rear-panel output voltage
If the output voltage is not correct, check the REAR LED and rear panel VOLTAGE Switch to verify
the unit is in the SET mode. Also, check that the voltage limit is higher than the desired voltage.
Front-panel test
This test verifies that all segment drivers are functional. Hold down the
ENTER
button while turning
on the unit to run the front panel test. After power is turned on, one segment of one numerical digit
should be on. Press the up arrow button to step through all eight digit segments of the present digit
and the following digit. When the up arrow button is pressed again, all segments and one of the
single LEDs should be on. Repeatedly press the up arrow button to cycle through all single LEDs.
The buttons can then be tested by pressing each button and observing the button code on the
display. The codes increase from top to bottom and left to right. After this test, turn the power off and
then back on to restart the instrument.
Power-on reset
If the instrument turns on with unusual combinations of LEDs on, garbled displays, or is unresponsive
to the front panel buttons, the memory contents may have been corrupted, causing the instrument to
lock up. To remedy the situation, turn the unit off and hold down the
CLR
button while turning the
power back on. Doing so causes the unit to initialize the memory and load the default setup.
No high voltage
If the Model 2290-5 does not enable the high voltage, check to make sure that the HIGH VOLTAGE
LED is on. If the HIGH VOLTAGE LED is OFF, check the following:
1. Make certain that you hold down the high voltage button for at least one-half second. This button
requires a fairly long button press to avoid turning on the high voltage accidentally.
2. Check the voltage limit and current trip levels to verify that they are sufficiently high for the
expected output values.
If the HIGH VOLTAGE LED is ON, but the output voltage is zero or lower than expected, check the
following:
1. The LIMIT LED is on. If so, the current limit value could be too low, or the load could be drawing
excessive current.
2. The voltage limit is as large as or larger than the desired output voltage.
3. The REAR LED is on. If so, the high voltage is being programmed by the analog voltage applied
to the SET/MON input on the rear panel and not by the front panel. Make sure that the rear panel
VOLTAGE switch is in the desired position.
4. The Interlock is not engaged.
