Samsung M3015 Series Service Manual

2. Product Specifications and Description2.2.6.3. FusingThe temperature change of the heat roller’s surface is changed to the resistance value through the use of a thermistor. TheMain Board uses the resistance value of a negative coefficient Thermistor and converts it to a voltage value through theuse of an AD converter, the temperature is decided based on the voltage value read. The AC power is controlled bycomparing the target temperature to the value from the thermistor. If the value from the thermistor is out of controllingrange, or does not change after a predetermined amount of time an error is displayed and the Fuser Power is cut off.An error occurs based on the bullets below:• Open Heat ErrorWhen the engine operates the warm-up process, if the temperature of the fixing unit is not higher than a specifiedtemperature, the engine defines Open Heat Error. When this error is detected, the engine stops all functions and keepsthe error state. Also, the engine informs the error status of the main system, so it can take appropriate action; and thenthe error message is displayed at LCD window or LED informing the error status of the user.• Low Heat ErrorWhen the engine is at stand-by, printing or warm-up mode, if the temperature of the fixing unit is lower than thespecified temperature at each state and the lower temperature state is maintained during the specified time, the enginedefines Low Heat Error. When this error is detected, the engine stops all functions and keeps it at the error state. Also,the engine informs the error status of the main system, so it can take appropriate action; and then the error messageis displayed at LCD window or LED informing the error status of the user.• Over Heat ErrorFor overall engine state, if the temperature of the fixing unit is higher than the specified temperature and the temperaturestate is detected for a specific duration, then the engine defines Over Heat Error. When this error is detected, the enginestops all functions and keeps it at the error state. Also, the engine informs the error status of the main system, so itcan take appropriate action; and then the error message is displayed at LCD window or LED informing the errorstatus of the user.2.2.6.4. LSULSU receives the image data from PVC or HPVC and make the latent image on OPC surface. It uses the single beam,LD. The errors related to LSU are as follows:• By LreadyWhen the printing is started, the engine drives the polygon motor of LSU. After the specified time is elapsed, if themotor is not in a ready status, the engine detects the error that the polygon motor is not in a ready status. If this errorhappens, the engine stops all functions and keeps it at the error state. Also, the engine informs the error status of themain system and the error message is displayed at LCD window to inform the error status of the user.• By HsyncWhen the polygon motor is ready, the LSU sends out the signal called Hsync and used to synchronize with each imageline. So, if the engine does not detect consecutively the signal for a fixed time, it defines the Hsync Error. If this errorhappens, the engine stops all functions and keeps it at the error state. Also, the engine informs the error status of themain system and then the error message is displayed at LCD window to inform the error status of the user. LSU ErrorRecovery: If the LReady or Hsync error happens, the paper is exited before the error code is initiated. The engine modeis changed to recovery mode and the engine informs the main system of the engine mode. And the engine checks theLSU error. If the error doesn’t happen, the printing job resumes.2-31 Copyright© 1995-2017 SAMSUNG. All rights reserved.