Dear Colleagues,

I have a Perkin Elmer Tri-Carb 2910 TR liquid scintillation machine (circa 1995) that is not advancing the tubes correctly. I can see in the back of the instrument that the pins which turn to move the cassette are misaligned, and therefore they cannot catch in the grooves of the cassettes. The pins in the front of the machine are aligned correctly. I have tried to manually align the back pins to no avail. Am I missing something? Is there an easy way to do this and I'm whacking my head against a wall for no reason?

Please help. The machine is no longer under a service contract and Perkin Elmer cannot help me. All other features of the machine work fine

Thank you-

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