4-8
Diagnostic Tests and Troubleshooting
Change in reference
spectrum
Mobile phase contains
gas or is contaminated
Prepare fresh mobile
phase and degas
thoroughly.
Air bubbles trapped in
flow cell
Reseat and check
alignment of flow cell.
Flush the flow cell (see
page 3-4
), or apply
slight backpressure of
207 to 345 kPa (2 to
3 bar, 30 to 50 psi) on
the detector waste
outlet. For example,
connect a 1- to 2-foot
(30- to 60-cm) length of
0.009-inch (0.23-mm)
ID tubing connected to
the detector waste
outlet.
Continuous audible
tone
Detector failure
Power the PDA detector
off and on again.
Detector not
responding to console
Bad or disconnected
cable
Inspect cable
connections, tighten
connectors, or replace
cable.
Configuration problem
Check Ethernet
configuration. For
details, see Empower
online Help.
Lamp light flashes
green and power light
constant green
The detector is
initializing.
No corrective action
required. Wait until
initialization completes
(both lights constant
green).
PDA detector troubleshooting (Continued)
Symptom
Possible cause
Corrective action
Summary of Contents for 2998
Page 12: ...xii Table of Contents...
Page 26: ...1 14 2998 PDA Detector Optics Principles...
Page 62: ...3 12 Maintaining the Detector...
Page 82: ...5 10 Spectral Contrast Theory...
Page 96: ...A 14 Safety Advisories...
