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Thanks, lots of info in there that possibly relates directly to the OP's issue.

This is caused by a flaw in the drum of one of the print cartridges. Hard to say which one though. The drum will discharge to the belt through a pinhole in the opc coating and that discharge causes...

I totally agree with your logic, but I have seen stranger things. It only takes a few seconds to check. Run a q-tip back and forth in the laser slot. see what comes out on the q-tip.

Another...

You will wear out feed components more quickly and possibly shorten fuser life, but I wouldn't think developer/toner would be affected by continuous use of heavier stock.

It sure looks like the symptoms created by dirty Laser Slit Glass. Like Phil suggested, have you vacuumed out the machine and cleaned the laser?

I agree. Maybe it is just discharge to prepare for next image cycle.

55mm doesn't correspond to any roller in the machine except maybe the fuser film which is 57mm. Hard to imagine the fuser film causing what you are seeing. Does this happen when printing an engine...

Curious if the imaging unit/toners in the machine when it was making the random bands were OEM or Rebuilt?

We see problems with the drums arcing to the transfer belt quite often when customers use...

I guess now we know each other a little bit better.

Wow Phil......

Those fuser cleaning units are not typically re-buildable once they start squealing. The bushings and bearings can be replaced but the cleaning rollers are not available. The...

Don't forget about the fuser. The cleaning roller bearings and bushings wear out and can make all kinds of noise. I personally had pretty good luck just removing the cleaning unit all together. This...

Its interesting that the problem repeats so regularly. Is 2 1/2 inches apart the exact measurement or an estimate. The exact measurement in millimeters would help in troubleshooting this.

I think you are on the right track. I notice Cyan in the center of the top band of black. I would try a cyan cartridge also. Not sure if this machine is using oem or rebuilt cartridges. Often,...

This ^^^^^^^ was exactly what I needed to fix mine! I'm in Tech Support for over 160 techs in the field for my company. Mine was printing only black. Engine test, Demo Page, Supply Status page, print...