We have a problem that is driving me mad. Every day at about the same time (4pm) one of our HP Laserjet 4015 (we have several) starts printing a black vertical line down the page. It starts off very faint and then gets darker with each page printed until it is absolutely jet black. It can be between 5mm- 15mm wide (it differs from day to day). Then suddenly, the line clears and everything prints cleanly again until about the same time the next day. This printer is used extensively throughout the day. We have changed the toner cartridge, the fuser and all the rollers but can’t see any logical reason for this problem. It just keeps happening.
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