Hoefer HE-PLUS System - Manual (Page 21)

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p11
Troubleshooting Guide
Problem Cause Solution
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 cords.
The fuse has blown. Replace the fuse.
Operation stops with
alarm: The screen
displays “NO LOAD”. Electrophoresis tank
is not connected to
the power supply
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 RUN/PAUSE to
restart the run.
Buffer concentration
incorrect. Replace buffer.
Operation stops with
alarm: Display shows
“OVER VOLTAGE”. Circuit is interrupted. Verify that the running buffer is correct.
Verify the all connections 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.
Turn power off then check the gel tank for
buffer leakage.
LID alarm. Cover of gel tank not
in correct place. Turn off power supply. Place the lid so the
magnet is pressed against the power supply
and restart.
If you cannot restart the instrument, turn off
the power, disconnect the power cord from the
outlet, and contact Technical Service.