23
TROUBLESHOOTING
Always make certain that the power entry module
is set for the correct line voltage and the correct
fuse is installed. The selected line voltage can be
seen through the window on the power entry
module. Verify that the line cord is plugged all the
way into the power entry module and the power
button on the front panel is pressed in.
Power on Reset
If the instrument turns on with odd combinations of
LEDs on, garbled displays, or is unresponsive to
the keyboard, the memory contents may have been
corrupted, causing the instrument to "hang". To
remedy the situation, turn the unit off and hold
down the CLR key while turning the power back
on. This causes the unit to initialize the memory
and load the default setup.
Stuck Keys
If the center display is filled with a particular
number (like 4444), or one particular message (like
Err2), and the keyboard is unresponsive, check to
see if a key is stuck down. If so, gently flick the
stuck key back to the center of its hole.
No 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 you hold down the high voltage
key for at least half a second. It is designed to
take a fairly long keypress to avoid having the
high voltage turned on accidentally by
bumping into the switch.
2) Check the voltage limit and current trip levels
to see that they are not too low for your load.
If the HIGH VOLTAGE LED is ON but the output
voltage is zero or lower than expected, check the
following.
1) Check if the LIMIT LED is on. If so, the
current limit value could be too low or the load
could be drawing excessive current.
2) Make sure the voltage limit is as large or
larger than the desired output voltage.
3) Check the the REAR LED. If it is on, then the
high voltage is being programmed by the
analog set voltage input on the rear panel and
not by the front panel. If so, make sure the
rear panel switch is in the desired position.
Repeated Trips
Voltage Trips: This may occur if the load changes
too rapidly, causing the voltage to overshoot. Try
raising the voltage limit.
Current Trips: Disconnect the load and see if the
unit still trips. If it works with no load, there may
be a problem with the load. If it still trips, the unit
may be damaged. Please contact the factory for
further information.
Primary Trip: If repeated PTRP's occur, the
power supply may be damaged. Please contact the
factory for further information.
Rear Panel Voltage Set
If the output voltage is not correct, check the
REAR LED and rear panel switch to see that they
are in the SET mode. Also check that the voltage
limit is higher than the desired voltage.
Front Panel Test
Hold down the ENTER key while turning on the
unit to run the front panel test. After power is
turned on, one segment of one numerical digit
should be lit. By pressing the UP arrow key, step
through all 8 segments of this digit and the
following one. This verifies that all of the segment
drivers are functional. On the next UP keypress, all
segments and one of the single LED's should be lit.
By repeatedly pressing the UP key, all of the single
LED's can be turned on, one at a time. The keypad
can then be tested by pressing each key and
observing the key code on the display. The codes
increase from top to bottom and left to right. After
this test, turn the power off and restart the
instrument.
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