I've a Samsung CLP-300; as of late there is a "no printing zone"
in the left hand side. Documents are hard to read because this
thin line leaves out certain letters; color prints - like photos - took terrible because it looks like someone draw a line of white-out top-to-bottom!
Samsung told me to take it apart and wipe all surfaces with 90% alcohol - I did - and had a hard-time getting to work at all after re-assembly!
Thankfully, it now working again - except for the strip.
This is a common problem with this printer. Each toner color has it's own roller. The tin blade on the inside edge of the roler gets plasticy buildup and needs to be cleaned.
Pull out the entire toner roller assembly for the color that is problmatic. Unscrew the tin blade from the roller assembly. Clean the inside edge of this blade (the part that scrapes on the roller) completely. NOTE: After cleaning mine with toilet paper & water I ran my fingernail along the edge to find that the waxy buildup was still there. I gently took my fingernail and scraped at it until it felt smooth -- no burrs.
NOTE: The edge of this blade is very sharp! Be careful. Don't run your finger along the edge.
Reinsall the tin plate maing sure that the foam sweeps (on the right and left of the blade) are not stuck under the tin blade. (If you do, it will dump large amounts of toner on your pages. Very messy).
Give her a whirl.
Check the imaging drum. There could be a defect that runs around the entire drum producing that white line (since it may not be holding a charge there to attract and hold the toner to be transferred to the page). Check your documentation if you don't know where to find the imaging drum.
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