Appendix B
Troubleshooting
Observation
Possible cause
Recommended action
The 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 cord.
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), 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: 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.
PowerEase
®
90W Power Supply User Guide
13
Summary of Contents for PowerEase 90W
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