Waters Prep Series Installation And Maintenance Manual page 113

Autoinjector troubleshooting (Continued)
Symptom
Autocalibration failed
Carousel engages and
turns, but does not find
position 1
Detector troubleshooting
Before using the troubleshooting tables in this section, use those that appear
earlier in the chapter to identify the part of the system in which the problem
originates.
Possible cause
System not purged
before autocalibration
Solvent not properly
degassed
System pressure
fluctuating more than
50 psi
System pressure not at
400 +/− 50 psi
Syringe contains a gas
bubble (usually seen at
the top of the syringe)
Leaks at the fluid
tubing connection
Seal pack failure
Dirty or defective
carousel
Defective carousel
reader
Corrective action
Purge system and
repeat autocalibration.
Sparge solvent.
Allow pressure to
stabilize, then repeat
autocalibration.
Set pump flow to
achieve 400 +/– 50 psi.
Remove bubble.
Check for leakage at the
connections with the
corner of a tissue, and
tighten connection
slightly if the tissue is
moistened.
Disassemble ferrule
connection, rinse,
reassemble, check for
leak.
Replace ferrule and
screw.
Replace seal pack.
Try another carousel;
clean carousel.
Call Waters Technical
Service.
Troubleshooting 3-29