Hach Company DU-640 ForumsSign in to Start a DiscussionStart a Discussion Wed Dec 10 2014Updated bydpkleessr COM/RS232 Mon Dec 02 2013Asked byASurya DU640 RS232 Thu Nov 07 2013Updated bydpkleessr manual Wed Aug 07 2013Updated bydpkleessr connecting water bath Thu Aug 01 2013Updated bydpkleessr BECKMAN DU 640 Spectrophotometer NOT START. FAN ONLY WORKS Sat Mar 13 2021Updated byinfo.antheo5650 monochromator error Thu Jul 11 2013Updated bycsc316 Service code Mon Aug 05 2013Updated bydpkleessr Mouse not working... Fri Nov 09 2012Updated byRic starting error for help Mon Jan 27 2014Updated bydpkleessr Light Path Fail Issue Page 2 of 3 123Ask a QuestionStart a Post: Hach Company - DU-640SubjectEnter a question about troubleshooting, PM, buying advice and moreā¦ Sign in to Submit your DiscussionSubmit your Discussion