Minolta 5400 Mark 1 - ZigZag artefacts

Yeah, that's what I noticed, huge variance between units. The 4 5400MK1 that I own all presents differents noise levels and patterns.

Archiloque said:

Meanwhile in my futile quest for the perfect scanner, I've received a 185 euros quote for the glass removal of the CCD sensor. I may go ahead with it, I just need to find a way to desolder it from its PCB as Eureca told me the procedure would be a lot riskier with a PCB. So, now, I need to get a desolder pump and hope for the best . I think i'll do it for completion sake.

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I know it's a crazy idea, but I'm always thinking about how to cool the sensor. A drop of 5-10C° can reduce the noise. I was thinking of a thin heat pipe or a peltier, but it's probably impossible to put it under the sensor without it moving out of place.
The PCB is screwed to a plate. Does this have a thermal conduction function or is it just a support frame?

If you remove the sensor, can you take some pictures?