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'No Head' error for optical detectors

Question asked by PeeJay on Sep 19, 2013
Hello, 

Does anyone here experienced a 'No Head' issue when a detector is connected to a certain interface? We constantly experienced such error and our usual solution was only,
1. Press the 'preset' button on the mainframe
2. Find a matching interface to the error.
I cannot deduce who can be the source of this error. It could be the interface, or the detector. I was hoping anyone here has a step-by-step initial solution regarding this problem.

Thanks.

PS. most of our detectors are 81623A/B and 81624A/B models  

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