Hoefer PR250 - Manual (Page 15)

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10. Troubleshooting
Problem Possible Causes Solution
Display does not light after No power Check the plug is correctly
switching power-on connected to both the
instrument and power supply.
Bad adapter Exchange adapter (24VDC 2A)
Switch failure Replace power switch
Other Contact Hoefer, Inc.
Uneven shaking of samples Sample containers are Place the sample containers
placed asymmetrically in a symmetrical pattern
The actual speed is different Broken sensor or poor Contact Hoefer, Inc.
from the displayed speed contact of the sensor module
“ERR” in the display Shaking speed can not Contact Hoefer, Inc.
be controlled
Start function on the Rheostat failure Contact Hoefer, Inc.
knob does not work