Instruction Manual peqPOWER 250 Volt Power Supply
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
1. Electrophoresis leads are not
connected to the power supply.
1. 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.
2. The electrophoresis unit(s), is
not connected.
2. Close the circuit by reconnecting the ca-
bles.
3. There is a broken circuit in
the electrophoresis cell
3. Press START/PAUSE to restart the run.
4. High resistance due to tape
left on a pre-cast gel
4. Correct the condition by making sure the
tape is removed from the pre-cast gel.
5. Incorrect buffer concentra-
tion, or incorrect buffer volumes
in the electrophoresis cell
5. Make sure 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”
6. High voltage application is
set to run on a very low current
6. Change current setting.
Operation stops
with alarm:
Display shows
“OVER VOLTAGE”
Circuit is interrupted
1. Verify that the running buffer is correct.
2. Verify the all cables are attached correctly
3. Turn the Power switch off and on again;
restart application.
4. 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
1. Check the electrophoresis system for im-
proper grounding.
2. Restart the power supply by turning the
Power switch off and on.
Operation stops
with alarm:
Display shows
“OVER TEMP”
Power supply is overheating
1. Turn off power supply. Check for sufficient
airflow around the power supply fan. After
cooling down, restart the power supply.
2. If you cannot restart the instrument, turn off
the power, disconnect the power cord from
the outlet, and contact Technical Service.
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