SMPS and Mainboard I've never seen cause print quality issues. The parts that could be causing both is the HVPS.
If the image is not being drawn, then this would be the toner cartridge, or the LSU. If the image is being drawn, then you know the problem is that the image is not being applied to the paper, so either the ITB is not working, or the fuser isn't working. The purpose of doing a jam test, is it tells you whether the image is being drawn or not. I've never seen this printer fail to print an image due to a mainboard issue. So I can't comment on the whole charge thing. I managed to find processor board on ebay (second-hand, cheap), hopefully this will solve the problem (this or that way)I'm not really sure what connector you are referring to. It's a pity circuit schematic is not available. and my manipulation charges that gate and temporarily enables printing. My theory is some control gate is floating.
The result was the same as with moving connector (and printing one page only.) Thank you for suggestion, I actually did that.
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