Sindoh M611 - Manual (Page 246)

Maintenance and Troubleshoot
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4) Select correct settings for OHP, card stock or label paper
from the printer driver.
5) Check if paper is wet.
6) Do not use rough paper.
Trouble 2: Toner stains are on paper..
Troubleshooting:1) Check if paper is properly fed.
2) The drum cartridge may have a problem.
Replace the new drum cartridge.
3) The toner is on the roller.
Clean up the roller.
To prevent this problem, do not use paper smaller than the
image to be printed.
4) Set the correct paper size from the printer setting or driver.
5) Open and close the front cover.
The roller is automatically cleaned
Trouble 3: The toner is smeared on paper.
Troubleshooting: 1) Set paper weight to heavy and choose rough texture
from the printer setting.
2) Check paper from printer specifications.
3) Check if correct paper is set from the printer setting or driver.
4) Use different paper. Printer paper provides the best quality.
5) The toner cartridge may have a problem.
Replace the new toner cartridge.
Trouble 4: Vertical or horizontal line.
Troubleshooting: 1) The toner may be low.
Shake the cartridge to use the remaining toner.
2) The toner cartridge may have a problem.
Replace the new toner cartridge.