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Troubleshooting
The motor sounds rough and aspiration is very slow.
Probable Cause
The pipette has been set to the
slowest speed.
Motor has not been used for an
extended period.
After reassembly, the pipettor leaks or does not fill liquid.
Probable Cause
O-ring was not properly seated.
O-ring was damaged during
reassembly.
Cylinder was not screwed tightly
into the pipette body. (single
channel only)
Tubing was disconnected from
tip fitting or cylinder.
Pipette does not eject pipette tip properly.
Probable Cause
During reassembly of the collet
and ejector sleeve, the metal
ejector trigger tab was not
correctly positioned behind the
plastic tab of the ejector sleeve.
(Single channel only)
30
Recommended Solution
Verify speed setting, the slowest speed
setting normally causes the motor to run
slowly and louder than usual.
Cycle the unit (fill and dispense) five to
seven times to re-lube the piston.
Recommended Solution
Disassemble the pipette and reseat the
O-ring. (See Section F.1 and/or F.2 for
pipette disassembly/reassembly).
Replace the O-ring. (See Section E.2.2,
Pipette Cleaning and Autoclaving
(Relubrication step) and Section E.2.3,
Pipette Reassembly).
Securely screw the cylinder into the
pipette body, finger-tightened.
Disassemble the pipette and reattach
the tube. If tube fits poorly, it may have
stretched and needs to be replaced or
trimmed of stretched section.
Recommended Solution
Reassemble the collet and ejector sleeve
with the correct orientation of the ejector
trigger tab to the ejector sleeve tab. (See
Section F.1.3, Pipette Reassembly).
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