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I had an instance a year or so ago, in which a client suite had (4) M607 printers, and all were producing defects similar to what you describe. Conferred with my fellow technicians and managers and...

Tray 2 pickup assembly is likely shot. RM1-6268 is the part number.

Instructions for replacing:

https://www.laserpros.com/img/TechTips/tray-2-pick-up-assembly-removal-and-replacement.pdf

I had this exact same issue on a CP4525 about a year ago. Found something in the service manual that pointed towards replacing the registration roller assembly. I replaced it, and the behavior...

This can be done in service mode. See page 625 of the service manual for instructions for entering service mode and updating the page counts, serial number, and other parameters.

Windows 7 on my laptop and client PC (I mentioned Win7 in the original post). PCL5 driver on my laptop, cannot recall the driver on the client PC.

Where is this setting? I cannot find it anywhere in the properties or preferences in the installed printer on my laptop. And should composite black be on or off?

Nothing unusual font-wise. Common fonts like Times New Roman and Arial.

Another detail: my client converted an MS Word document (simple one page letter with a common font) to pdf, and THAT pdf...

Black PQ page is perfect. That would rule out laser assembly and black toner.

I have an HP Color 4600 with a very strange print quality issue. Black print near the right edge of the paper prints lightly, but only under this specific scenario: when printing all black documents...

I have an HP Color 2550n that displays a secondary error code which is not listed in the service manual:

31885

The 'attention' and 'ready' lights are lit when pressing the go and cancel...

A chocolate covered raisin in the document feeder of a Brother MFP.

Sometimes, just changing the pickup roller/separation pad resolves this problem (at least in my experience). I have had several instances where I changed the roller/pad, without changing any...