Samsung ML-1665 Service Manual

Also see for ml-1660: User guide

Contents

Product spec and featureService Manual 2-24 Samsung Electronics2.2.5.3 FusingThe temperature change of the heat roller’s surface is changed to the resistance value through the thermistor.By converting the voltage value, which impressed to the resistance, to the digital value through the ADconverter, the temperature is decided. The AC power is controller by comparing the target temperature tothe value from the thermistor. If the value from the thermistor is out of controlling range while controlling thefusing, the error stated in the below table occurs.• Open Heat ErrorWhen the engine operates the warm-up process, if the temperature of the fixing unit is not higher than aspecified temperature, the engine defines Open Heat Error. When this error is broken out, the engine stopsall functions and keeps the error state. Also, the engine informs the error status of the main system. 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 thanthe specified temperature at each state and the lower temperature state is maintained during the specifiedtime, the engine defines Low Heat Error. When this error is broken out, the engine stops all functions andkeeps it at the error state. Also the engine informs the error status of the main system. And then the errormessage is 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 thetemperature state is kept during the specified time, the engine defines Over Heat Error. When this error isbroken out, the engine stops all functions and keeps it at the error state. Also, the engine informs the errorstatus of the main system. And then the error message is displayed at LCD window or LED to inform theerror status of the user.2.2.5.4 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 LReady : When the printing is started, the engine drives the polygon motor of LSU. After the specifiedtime is elapsed, if the motor is not in a ready status, the engine detects the error that thepolygon motor is not in a ready status. If this error happens, the engine stops all functions andkeeps it at the error state. Also, the engine informs the error status of the main system and theerror message is displayed at LCD window to inform the error status of the user.• By Hsync : When the polygon motor is ready, the LSU sends out the signal called Hsync and used tosynchronize with each image line. So, if the engine does not detect consecutively the signal fora fixed time, it defines the Hsync Error. If this error happens, the engine stops all functions andkeeps it at the error state. Also, the engine informs the error status of the main system and thenthe error message is displayed at LCD window to inform the error status of the user.LSU Error Recovery: If the LReady or Hsync error happens, the paper exits out beforehand.The engine mode is changed to recovery mode and the engine informs the main system of theengine mode. And the engine checks the LSU error. If the error doesn’t happen, the printing jobwill be proceeding.