8
| LABNET ENDURO POWER SUPPLIES
11.0 Troubleshooting
Review the information in the table below to troubleshoot operating problems.
Problem
Possible Cause
Solution
LCD screen remains blank,
and the fan does not run
when the power is turned
on
AC power cord is not
connected.
Check AC power cord connections at both ends.
Use the correct cords.
The fuse has blown.
Replace the fuse.
Operation stops with
alarm: The screen displays
“
NO LOAD
”
Electrophoresis leads
are not connected to the
power supply or to the
electrophoresis unit(s).
Check the connections to the power supply
and your electrophoresis cell to make sure the
connection is intact.
Check the condition of the wires in your
electrophoresis unit.
Close the circuit by reconnecting the cables.
Press
START/PAUSE
to restart the run.
A broken circuit in the
electrophoresis cell.
Operation stops with
alarm: The screen displays
“
NO LOAD
”
High resistance due to
tape left on a pre-cast
gel, incorrect buffer
concentration, or
incorrect buffer volumes
in the electrophoresis
cell.
Correct the condition by making sure the tape
is removed from the pre-cast gel or buffers
are prepared correctly, and the recommended
volume of buffer is added to the electrophoresis
unit.
High voltage application
is set to run on a very
low current.
Disable “NO LOAD” alarm on the Display Screen.
Operation stops with
alarm: Display shows
“
OVER VOLTAGE
”
Circuit is interrupted.
Verify the running buffer is correct.
Verify all cables are attached correctly.
Turn the Power switch off and on again;
restart the application.
If you cannot restart the instrument, turn off
the power, disconnect the power cord from
the outlet, and contact Scientific Support.
Operation stops with
alarm: Display shows
“
LEAKAGE
”
Ground leak detected
during the run.
Check the electrophoresis system for improper
grounding.
Restart the power supply by turning the Power
switch off and on.
Operation stops with
alarm: Display shows
“
OVER TEMP
”
Power supply is
overheating.
Turn off the power supply. Check for sufficient
airflow around the power supply fan. After
cooling down, restart the power supply by
turning the Power switch to the On position.
If you cannot restart the instrument, turn off
the power, disconnect the power cord from
the outlet, and contact Scientific Support.
