Hi, We are having a problem with our ACAS 570 that results in the cells on the microscope stage coming in and out of focus while in the kinetics image scan mode. It seems to oscillate in and out of focus (one complete cycle) about every 120 secs. Although the problem was first noticed while assaying viable cells, it has been confirmed with fluorescence of non-viable cells so the fluorescence should have remained stable. I believe it may be the end coder - a little gizmo inside the fine focus housing (actually it's the gizmo to which the fine focus knob is attached). The part we have has the following on a label: SOFTPOT USDigital (206) 576-0514 S1-100MT (an older one that we had replaced earlier says, SP-100 and gives an address for USDigital in Los Alamitos, CA, but they are apparently out of business) Can anyone suggest a source for this 'end coder'? Thanks for any help. Ray ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Raymond B. Hester, Ph.D. Flow Cytometry Lab CSAB 357, Biotechnical Services The University of South Alabama Mobile, AL 36688-0002 Email: rhester@jaguar1.usouthal.edu Voice: (334) 460-6029 FAX: (334) 460-6073 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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