Instruction Manual

46 Troubleshooting
Table 5-1 Troubleshooting Guide, General (Continued)
Symptom Possible Cause Recovery
A. Pump air pressure too low.
A. Set valve pressure to
40-80 psi.
(For encoded models, set the
fluid pressure to 40 psi instead
of the valve pressure.)
B. Speed Control too slow.
B. Make sure Speed Control is
greater than 1.
C. Stopcock jammed with cured
material.
C. Replace the stopcock.
4. Pump unable to
complete reset routine.
D. Stopcock Cylinder Adjustment
Screw too tight.
D. Loosen the Stopcock Cylinder
Adjustment Screw.
A. Air in chamber. A. Perform a priming sequence.
B. Fluid is slightly compressible
or stopcock is expanding.
B. Use a larger diameter needle.
5. Material drips or trails
slightly from the needle.
C. Stopcock cylinder adjustment
screw is improperly adjusted
(non-encoded version only).
C. Turn the stopcock cylinder
adjustment screw clockwise so
that the stopcock moves from
the refill position to the
dispense position more slowly.
Typically, it should be adjusted
so that it takes 2 seconds for
this motion.
A. Seals are worn out. A. Replace seals.
6. Fluid leaking from
prime port on side of
pump body.
B. Valve pressure or fluid
pressure set too high.
B. Lower valve pressure (non-
encoded models) or fluid
pressure (encoded models).
A. Piston is out of sensor range.
A. See “Feed Screw Jam
Recovery” in this section.
B. No power to motor.
B. See 2. No Power to Motor
above.
7. Pump not dispensing or
responding.
C. DP-3000 has reached its
Travel Limit.
C. See “DP-3000 Reaches Travel
Limit Recovery” in this section.
A. Priming port clogged. A. Clean pumping chamber.
8. No material comes
through priming port
when priming.
B. Valve or fluid pressure set too
low.
B. Set the valve pressure (non-
encoded models) or fluid
pressure (encoded models) to
40-80 psi.
9. Stopcock not actuating A. Air not hooked up
A. Ensure that the air is on and is
reaching the stopcock.
A. Lead screw malfunction.
A. Contact Asymtek Technical
Service Group for repair.
10. Inconsistent accuracy
and repeatability.
B. Lead screw bearing
malfunction.
B. Contact Asymtek Technical
Service Group for repair.
11. Needle moves during
dispensing.
A. Stopcock and needle
assembly is not assembled
correctly.
A. See “Preventing Needle
Movement” in the Operation
section.