"This error is a fusing thermistor error, it can mean:
The fusing lamp is not connected. Reconnecting it may solve the problem.
Thermistor is bent or gone bad. You may need to replace it.
Or, the thermistor position is incorrect.
To try and reset the code press:
Clear Mode, 107, Clear/Stop and hold for 5 seconds."
SC500Main motor/transport motor lock/Fusing motor error
SC501Drawer 1 lift motor malfunction
SC5022nd or 1st tray lift motor malfunction
SC503Drawer3(or 2nd) lift motor error
SC504Drawer 4 or 3rd lift motor malfunction
SC505LCC Tray malfunction
SC506Paper tray motor lock
SC507LCT main/feed motor lock
SC508Rear fence drive motor
SC509Drawer 3 LCT right fence error
SC510LCT lower limit error
SC511LCC motor lock
SC515Drawer left guide drive motor error, Tandem rear fence motor error
SC516Drawer 1 side guide motor error
SC520Paper tray error/Duplexer jogger drive motor error
SC521Duplexer jogger driver motor error 2
SC522Duplex-Side fence jogger HP error
SC524Duplex-End fence jogger HP error
SC530Bypass feed motor lock/fusing fan motor error
SC531Fuser/Duplexer reversing motor error
SC541Fuser thermistor open/ Hot Roller thermistor open
SC542Fuser Temperature warm-up error
SC543Fuser overheat error1
SC544Hot roller fusing lamp lower limit temperature detected
SC545Fuser lamp overheat error 2
SC546Fuser ready temperature malfunction
SC547Zero cross signal malfunction/ Fusing temperature does not increase
SC548Fusing installation error
SC550Fusing web end
SC551Pressure roller thermistor open
SC552Pressure roller warm up error
SC553Pressure roller overheat
SC554Pressure roller low temperature abnormal
SC555Pressure roller ready temperature abnormal
SC557Pressure roller temperature does not increase
SC558Zero cross signal abnormal
SC590Exhaust/Fusing fan motor error/used toner collection motor error
SC591Toner supply motor error
SC592Toner bank motor error
SC599Copy exit tray motor lock
SC500:Too much load on the drive mechanism
Some gears or other rotating parting has been jammed.
Developing unit is over toned.
Main motor or its driving board is defective.
Before replacing motors or sensors, first check the mechanical load.
SC 541:Fusing thermistor open:
Machine is plugged into low line voltage.
Fixing thermistor is defective or out of position.
Some loose connection
Power Supply board defective
SC590:Left exhaust fan motor error
Loose connection of the exhaust fan motor.
Too much dust in the fan causing too much load on the motor driver.
(e) 6XX: Communication errors
SC600Communication Error Between Main Control and Operation Panel Boards
SC634Key/ Card Counter Device Error
SC636Communication Error Between BICU & Paper Feed Control PWA
SC696Communication Error Between Engine Boad and Finisher
SC621:ADF connection error
An incorrect ADF is installed on the machines.
The connector of the ADF is removed while the machine is in the energy save mode.
(f) 7XX: Peripherals Problems
SC700RADF Original Pickup Malfunction
SC702RADF Feed Motor Lock
SC703RADF Transport Motor Lock
SC704RADF Original Exit Motor Lock
SC705RADF Bottom Plate Motor
SC721Sorter Bin Motor
SC722Finisher/Sorter Jogger Motor
SC727Finisher Stapler Rotation error
SC728Finisher paper stack height error
SC733Finisher Lower Tray lift Motor
SC760ADF Gate Abnormal
SC770Display Editor Abnormal
SC700:ADF pickup problem
Home sensor is defective
ADF board or pickup roller mechanism is defective.
SC733:Finisher lower tray lift motor
stack height sensor or lower tray limit sensor may cause this problem
(g) 8XX: Controller Errors
SC800Startup Without Video output End
SC804Startup Without Video Input End
SC818Watchdog Error, Software Malfunction
SC819Kernel Mismatch, Download Firmware again
SC820Self Diagnostic Error,Download Firmware again
SC855Wireless LAN card problem detected
SC857USB Interface Error Detected
SC868Incorrect Data is detected in the SD card
SC870Address Book Data stored on the hard disk was abnormal
SC 826:Self diagnostic error:
NVRAM on the controller board is defective and must be replaced.
SC855:Wireless LAN card error
Poor Connections between LAN card and the printer
Defective controller board.
Defective wireless LAN card.
Please note that this detail is just for information. Do not try to repair a machine if you are not a qualified technician. Technicians should also not take this information as a substitute of technician manuals.