8
TROUBLE SHOOTING
Many operating problems may be solved by carefully reading and following the instructions in this manual
accordingly. Some suggestions for troubleshooting are given below. Should these suggestions not resolve
the problem, contact us at Tel.: 0721/5606-0 for assistance. If troubleshooting service is required, please
include a full description of the problem.
Problem
Cause
Solution
No Display / lights
No AC power
Check if Mini power supply is unplugged,
or if there is an AC power source problem
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
Repeated fuse
broken
Hardware failure
Contact our service department
Operation stops
Electrophoresis leads are
not connected to the power
supply or to the
electrophoresis unit(s), or
there is a broken circuit in
the electrophoresis tank
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/STOP
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 tank
Correct the condition by making sure the tape is
removed from the pre-cast gel, that the buffers are
prepared correctly, and the recommended volume
of buffer is added to the electrophoresis unit.
Error Message
Cause
Solution
Current exceeds the
maximum output for the
power supply (>400 mA)
Check if the buffer concentration or molarity is
appropriate. Excessive buffer concentration or
molarity may increase conductivity. To clear the error
message, press the
START/STOP
button.
Voltage exceeds the
maximum output for the
power supply (>300 V)
Press
the
START/STOP
button
to clear the error
message. Contact our service department if the
problem persists.
Thermal limitation of the
power supply reached
(Output voltage <10 V)
(1) Check the connections
(2) If the
Er3
error message persists, the problem
may be caused by internal fan failure. Contact our
service department
No load is detected
(1) Check the connections
(2) Check the buffer condition / buffer level
Power exceeds the
maximum output (60 W)
Warning message for reference
ROTH Power Supply MINI
2907.1
1 unit
Carl Roth GmbH + Co. KG
Schoemperlenstraße 3-5 • 76185 Karlsruhe • P.O. Box 100121 • 76231 Karlsruhe
Phone: +49 (0) 721/ 5606-
0 • Fax: +49 (0) 721/ 5606-149 • [email protected] • www.carlroth.com
The company is a limited partnership with headquarters in Karlsruhe, reg. court Mannheim HRA 100055. Roth Chemie GmbH, with h eadquarters in Karlsruhe,
reg. court Mannheim HRB 100428, is the personally liable partner. M
anaging Director: André Houdelet. Sales tax identification number: DE 143621073.
ed 09/2021
