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7-17
6. PROBLEM SOLVING
Quick Guide to Problem Solving
You Notice
1. Uneven pressure
trace.
2. Pressure drops.
3. No flow out the
outlet check valve.
This May Mean
1. Bubble in
check valve.
2. Leaks in
system.
3. Dirty check
valve.
4. Bad check
valve.
Possible Cause
1. Solvent not properly
degassed.
2. Fittings are not tight.
3. Mobile phase not properly
filtered.
4. Particles from worn piston
seal caught in check valve.
5. Plugged inlet filter.
You Should
1. Check to be certain that mobile phase is
properly degassed.
2. Check connections for leaks by tightening
fittings.
3. Prime the system directly from the outlet
check valve.
4. Clean or replace the check valves. See
Section 5.4.
5. Clean or replace inlet filter. See Section
5.1.1.
1. Uneven pressure
trace.
2. Pressure drops.
3. Fluid between the
pump head and the
retainer.
1. Leaks in
system.
2. The piston
seal or
diaphragm is
worn.
1. Fittings not tight.
2. Long usage time since last
seal / diaphragm change.
3. Salt deposits on seal or
diaphragm (especially if
buffered aqueous mobile
phases are used).
1. Check all connections for leaks.
2. Replace piston seal & diaphragm. See
Sections 5.2 and 5.3.
3. Check the piston for salt deposits. Clean as
necessary. See Section 5.2.4.
Pump makes a loud
clanging or slapping
noise (intermittent
contact with cam).
Piston carrier is
catching in
piston guide.
1. Cap nut screws on the pump
head are loose.
2. Seal(s) are worn.
3. Piston guide is worn
1. Check cap nut screws on pump head.
Tighten if necessary.
2. Replace seals.
3. Replace piston guide and seals. See
Sections 5.2 and 5.3.
No power when pump
turned ON.
Blown fuses in
the power entry
module.
1. Power surge.
2. Internal short.
1. Replace only with the appropriate fuses (1A
for 100/110 Vac or 1/2A for 220/240 Vac).
2. Contact service technician if problem
persists.
Blue dye in mobile
phase.
Pulse damper
diaphragm has
burst.
Sudden pressure drop when
purging system.
Replace pulse damper. See Section 5.5.
Pump runs for 50
pump strokes, then
shuts down.
Lower pressure
limit is
activating.
1. Mobile phase is not properly
filtered.
2. Particles from worn seal
trapped in the system (e.g.,
tubing, filters, injection valve,
column inlet).
1. Check to be certain the low pressure limit is
set to 0 psi.
2. Only increase the low pressure limit after the
pump attains operating pressure.
3. Contact service technician.
1. Pump shuts down
after run is called
even with no
column connected.
2. Pump runs to
maximum pressure
and shuts down.
Clog in fluid
system.
1. Remove and clean both the inlet and
bulkhead filters. See Section 5.2.
2. If the problem persists, remove tubing from
system one piece at a time until you find the
clogged piece. Most clogs occur outside the
pump itself.
No power when pump
turned ON. Fan does
not run.
Blown fuses in
the power entry
module.
1. Power surge.
2. Internal short.
1. Replace only with the appropriate fuses (1A
for 100-120 Vac or 1/2A for 220-240 Vac).
2. Contact service technician if problem
persists.
Front panel appears
OK but pump motor
does not run.
Blown fuse on
the motor power
circuit board.
1. Power surge.
2. Internal short.
1. Replace only with the appropriate fuse .
2. Contact service technician if problem
persists.
PEEK fittings or
components leak.
You cannot
force PEEK
parts with
interference to
seal by brute
force tightening.
1. Film of fluid between
surfaces.
2. Salt crystals between
surfaces.
3. Scratches in mating surfaces.
1. Clean and dry mating surfaces.
2. If scratched, replace defective part.