HP Laserjet 5SI/MX printing very grey

Dec 12, 2021
I am the proud owner of an HP Laserjet 5Si/MX. Until a few months ago it produced beautiful copy, but now the output tends towards light and grey - image attached. I have replaced the transfer roller (which helped a bit), the cartridge (re-manufactured), and the high-voltage supply board. So far nothing has restored it to full functionality. The toner has no tendency to rub off, so I doubt if there is a fuser problem.

What should I try next?

Your thoughts and advice will be greatly appreciated.

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