Discussion Category:  UHPLC Systems

Flashing Red Check Mark on UV Detector

What does the flashing red check mark on the UV detector indicate?  Would it be the monochrometer, power supply, or other problem?  I changed the Deuterium lamp and solvent to HPLC grade water.  The check mark stills flashes red.

Update: “A/Z/ OUT OF RANGE” error is displayed, but THF and HPLC grade water result in the same error.  A second freshly opened bottle of THF also showed the error, too.

Update:  I ended up changing out the lamp, which still showed the error after 72 hours equilibration.  Then, I thoroughly cleaned the monochrometer interior, lubricated the worm drive, cleaned all flow cell parts, and cleaned the fan area (because I was already elbow deep inside).  One or all of these cured the problem. . . for now.

Any advice will be greatly appreciated.

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