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Smudge marks on one side usually means either:
A. a toner cartridge (of the color of the smudges) is leaking, and/or
B. toner is loose in the printer (as a result) and is getting onto the paper.
A general cleaning is good for (B) - replacing the toner cartridge of that color is appropriate for (A).
Here's the procedure for cleaning:
It is usual, with all laser printer problems, to Open, Inspect, Clean (carefully), Close Up, and Try Again.
Open: Unplug the machine for safety. Get access to the internal workings, esp. those of the problem area. Remove cartridge(s) if necessary.
Inspect: look for anything wrong or odd in the problem area. Spilled toner? bent or broken parts? stuck sensor switch? tabs or tape not removed from toner cartridge(s)?
Clean (carefully): Take a dry white or light colored high-quality lint-free rag cloth, and wipe firmly all possible plastic or especially metal surfaces that could have toner/paper dust/fluff/anything on them. Carefully, to avoid touching, spraying, moistening, abrading, or exposing to direct light for longer than 1 minute out of 15 or more, the shiny, usually blue-green (but sometimes red-purple) photosensitive 'drum' or roller, which is easily damaged.
Close up: put everything back in, close covers, etc.
Try again: plug in, turn on.
- Let me know what you observe or find out. There may be more to do for the problem.
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