Oki MPS420b User Manual

Also see for MPS420b: Maintenance manual Material safety data sheet

Contents

Oki MPS420b User Manual Manual pdf 64 page image

Troubleshooting > 64PRINT QUALITY PROBLEMSBefore consulting a service representative regarding a print quality problem, check thetable below to see if there is a solution, or something you might have overlooked.SYMPTOM PROBLEM SOLUTIONBlank sheetsprinted.Image drum cartridge notproperly installed.Reinstall image drum cartridge.Empty or missing tonercartridge.Install new toner cartridge.Entire page printsfaintly.Empty toner cartridge. Pagesget fainter when toner is usedup.Install new toner cartridge.LED array is dirty. Clean LED array.Page has greybackground.Static electricity, generallyfrom dry environments,causes toner to stick tobackground.Change paper to a smoother laserbond or use a humidifier.Page prints allblack.Hardware problem. Contact service.Page hasrepetitive marks.Damaged image drumcartridge causes repetitivemarks every 1.6 inches (4.06cm) due to surface nicks andscratches.Generate a cleaning page, repetitivemarks may be temporary.Oblong area offaint printappears on eachpage.Drop out caused by usingpaper exposed to highhumidity.Change paper stocks, check paperstorage environment or use adehumidifier; check toner level.Vertical whitestreaking or faintareas on page.Toner is low and does notdistribute properly, or thedrum is worn out.Replace toner cartridge. Check drumand replace the drum, if necessary.Contact service.LED array is dirty. Clean LED array.Vertical blacklines.Hardware problem. Contact service.Fuzzy print. LED array is dirty. Clean LED array.Distorted print. Paper path, lamp assembly,or fusing unit problem.Generate cleaning page.Contact service.Faded print. Toner cartridge is notcorrectly installed.Toner low.Install toner cartridge correctly.Replace toner cartridge.Smeared orblotched print.Dirty rollers; toner droppedinside printer or image drumproblem.Replace image drum and toner.Contact service.Printed page islight/blurred.Is toner low? Replace toner cartridge.Is paper meant for laserprinters?Use recommended paper.LED array is dirty. Clean LED array.