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7-2
Troubleshooting 7
Mechanical Problems
Mechanical Problems
Problem Possible Cause Solution
Valve does not fit on to the 402. Valve axle not properly aligned Ensure that the flat on the axle
with the motor drive. is aligned with the drive slot on
the motor.
Valve moves during aspirate or Valve mounting screw not tight. Check that the mounting screws,
dispense. syringe and syringe mounting
screw are all tight.
Syringe does not move properly. Tubing blocked. Check that the inlet tubing or
transfer tubing is not blocked.
Valve sticks Instrument left unused. Remove the valve (see page 6-2).
Use the valve key, reference
F123674 to turn the valve axle
and turn the key to free the valve.
Do not try turning the axle with
your fingers, it is not possible to
apply the necessary torque.