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I have a OKI C5400 with a Vista operating system. My problem is: the print quality isn't a good through Vista as it was when I had it on my old XP system. I have the up to date driver (the only one that OKI offers for this model) I have tried many different settings within the setup dialog for the printer with no luck. The pictures I print are grainy - course, they don't print fine, it is like I'm using a low dpi printer setting. Is there any specific settings I can try, any help would be great. Thanks.
Assuming that you are using the same paper and have not changed any of the consumables you should do the following: 1.Clean LED head with lens cleaner or soft tissue.
Remove the toner cartridge and give it a few shakes then reinstall it.
The Toner Could be low so Change toner cartridge.
4.Make sure that the paper is not damp as this will cause fading and poor quality printing and images.
The image drum may have been light contaminated so remove it from the printer and store it in a totally dark place for several hours then reinstall it.
If the image drum is dirty then wipe it very gently with soft tissues, being careful not to scratch it.
Open the top cover and check to be sure that each toner cartridge is fully seated and that each toner cartridge lock lever is pushed all the way back.
Press the top cover release latch and open, then close, the cover.
Check MEDIA MENU – TRAY1 MEDIA TYPE and set as required. Do the same for TRAY2 and MPT.
Check MEDIA MENU – TRAY1 MEDIA WEIGHT and set as required. Do the same for TRAY2 and MPT.
Possibly set the value of media weight in the menu to the next heaviest one.
Check PRINT MENU – RESOLUTION setting and set to 600 x 1200DPI
Check PRINT MENU – TONER SAVE MODE and make sure this is OFF
Check PRINT MENU – MONO PRINT SPEED and make sure this is set to MIXED SPEED
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It is unlikely to be the printer (not impossible but unlikely) have you checked the settings on your computer, make sure you have not selected print in greyscale in the print options.
The manuals are available here: ( http://www.c5400.co.uk/index.asp?printername=C5400&menumode=0&content=c5400downloads )
I'm not an expert on these but I'd guess either the high voltage unit or LED laser PSU are suffering from an intermittent problem. If you're lucky it's just a loose connector - but I'll bet you've already tried re-seating every connector you can find :)
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