VWR International 250V, Instruction Manual

Page: 103 / 174

6/22/2012
Revision 1.0 11
Troubleshooting
Review the information in the table below to troubleshoot operating problems.
Problem Cause Solution
AC power cord is not connected Check AC power cord connections at both ends. Use
the correct cords.
The LCD screen
remains blank and the
fan does not run when
the power is turned on
The fuse has blown Replace the fuse
Electrophoresis leads are not
connected to the power supply or to
the electrophoresis unit(s), or
there is a broken circuit in the
electrophoresis cell
Check the connections to the power supply and on your
electrophoresis cell to make sure the connection is
intact; check condition of wires in electrophoresis unit.
Close the circuit by reconnecting the cables. Press
START/PAUSE to restart the run.
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, buffers are prepared
correctly, and the recommended volume of buffer is
added to the electrophoresis unit.
Operation stops with
alarm: The screen
displays “NO LOAD”
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 that the running buffer is correct.
• Verify the all cables are attached correctly
• Turn the Power switch off and on again; restart
application.
• If you cannot restart the instrument, turn off the
power, disconnect the power cord from the outlet, and
contact Technical Service.
Operation stops with
alarm: Display shows
“LEAKAGE”
Ground leak detected during 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 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 Technical Service.