LabWrench

Hi, I'm hoping the wise folks here can lead me in some direction to correct the following problem. I have an older Beckman DU-640 that has an increasing frequency of the Light Path Failed message appearing when I start it up. I have checked the sample chamber and have done a wavelength calibration to no avail.  Are there any diagnostics that I can run to eliminate or narrow down the problem? Thanks.

Thanks, gr. I aligned (peaked) the Vis lamp and it was off by about 46%T. Upon re-starting everything passed. Hopefully that has solved the issue. If Light Path Fail re-appears I'll update this post. Thanks again!