CP-642: What reset nozzles at start of nozzle centering?

Hi all,

Our (new/used) CP642 resets the nozzles heads first time I do a nozzle centering after power on. But we're getting errors st17 and st19 and while working on the sensors I noticed that it does not resets the heads before I start a nozzle center again. Even though it needs because some of them are rotated and not facing the sensors (st17 and st19). So I keep getting errors st17 and st19 until I manually place them in the right position. I checked the proper data in the book we have but I don't see what could cause it to do this. We have another CP642 that works fine and comparing proper data is not getting me anywhere.

What makes the machine reset the heads every time I start a nozzle centering?

Thanks

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