Samsung SCX-4720F Service Manual

Also see for SCX-4520: Product guide Solution guide User guide User manual User manual

Contents

TroubleshootingService Manual 7-27Samsung ElectronicsFault Signs Cause & Check SolutionGhost & ImageContamination• The printed imageis too light or dark,or partiallycontaminated black.• Totallycontaminated black.(Black imageprinted out)• The density ofprintouts is too darkand ghost occurs.1. The printed image is too lightor dark, or partiallycontaminated black.(a) Check if foreign substanceor toner are stuck to theterminals (point of contact)of the toner cartridge or set.(b) Check if the terminalassembly is normal.2. Totally contaminated black.(Black image printed out)(a) Check if foreignsubstances are stuck tothe terminal (point ofcontact) of the tonercartridge or set.(b) Check if the terminalassembly is normal.(Especially check thecharge roller terminal.)3. The printed image is dark andghost occurs.(a) Check if foreignsubstances are stuck tothe terminal (point ofcontact) of the tonercartridge or set.(b) Check if the terminalassembly is normal.(Especially check thedeveloper roller terminal.)1. All of Items 1, 2, 3(a) Clean the contacts on thetoner cartridge.(b) Clean the contact points onthe set.(c) If the terminal assembly isdamaged repair or replacethe terminals in the set orreplace the cartridge2. In Item 2This is particularly related toproblems with the charge rollercontact. Pay close attention tothe charge roller contacts.3. In Item 3This is particularly related toproblems with the developerbias voltage contact. Pay closeattention to the charge rollercontacts.