Oki Data CONFIDENTIAL45487001TH Rev.1 6-58 /6. Troubleshooting procedure6.5.2.(10) Fuser unit error (Errors 167 to 177)(10-1) Error occurs immediately after the power is turned on.Check item Check work Actions to be takenat NG(10-1-1) Thermistor is defective Note)Upper thermistor,lower thermistor,side thermistor,heater thermistorCheck the respective thermistors if they areshorted or opened internally.Check the resistance value at the connectorpins in the bottom of the fuser unit.(Refer to section 9.1 Resistance value (fuserunit).)Replace thefuser unit.If any attempt ofusing new fuserunit as a trialis going to bemade, be sure touse the SystemMaintenanceMenu FUSEKEEP MODE.Installed conditionof fuser unit.Check if the fuser nit is pressed in until theconnector in the bottom of the fuser unit issurely connected.Re-set the fuserunit.Note! Service calls 171: Error and 175: Error can occur when the printer temperatureis below 0˚C. Turn on the power again after the printer temperature hasincreased.(10-2) Error occurs approx. 1 minute after the power is turned on.Check item Check work Actions to be takenat NG(10-2-1) Temperature increase of fuser unitThermostat, heater Heater of the fuser unit is controlled of itstemperature. Check if the fuser unit gets hotor not by touching it with hands.If the fuser unit temperature does not increaseand remains cold, check that the resistancebetween pin-1 and pin-4 and between pin-3and pin-2 is about 1 to 3Ω, between pin-2 andpin-4 is about 4 to 7Ω respectively. (Refer tosection 9.1 Resistance value (fuser unit).)Replace thefuser unit.If any attempt ofusing new fuserunit as a trialis going to bemade, be sure touse the SystemMaintenanceMenu FUSEKEEP MODE.(10-2-2) Temperature increase of fuser unitInstallation positionof the LowerthermistorThe Lower thermister must be installed whilecontacting with the fuser unit. Check if thelower thermister is installed in the far positionfrom the specified position or not causingdetection of the lower temperature than theactual temperature of fuser unit.Replace thefuser unit.If any attempt ofusing new fuserunit as a trialis going to bemade, be sure touse the SystemMaintenanceMenu FUSEKEEP MODE.
