4-4
Troubleshooting
Understanding power surges
Power surges, line spikes, and transient energy sources can impede
instrument operation. Ensure that the instrument’s electrical supply is
adequately protected from these conditions and properly grounded.
Understanding the status LED
The status LED on the instrument’s front panel has a twofold purpose:
to indicate overall status and to indicate when the instrument is
powered-on or powered-off. When the instrument is working properly,
the status LED is green.
Conducting analytical troubleshooting
Analytical problems like bad reproducibility or carryover can occur in any
HPLC system. You may have to try several procedures to find the cause. First
determine whether the instrument or the rest of the system is causing the
problem by doing the following:
•
Replace the valve by a manual injection valve to discriminate between
valve problems and other problems.
•
Do a number of full loop injections. If the results are fine, the fault is in
the instrument; if not, check the rest of the HPLC system.
External influences like temperature or light sensitivity can cause problems
with analyses. Verify that the application was operating properly before the
problem arose and that the system underwent no changes.
LED mode and color
Indicates
Off
The instrument is off.
Steady green
The instrument initialized without
error.
Flashing red
An error stopped the instrument.
Tip:
The console log has error
information. Use the Control menu to
reset.
See also:
The 2707 Autosampler
online Help.
