Dell 1135N Service Manual

Also see for 1135N: Specifications User guide Specifications

Contents

Product specification and feature2-28Service Manual2.2.5.3 FusingThe temperature change of the heat roller’s surface is changed to the resistance value through thethermistor. The Heat Roller temperate (warmup) is measured by converting the resistance of the thermistorto a measurable DC voltage value. The AD converter changes it to a digital value so it knows when it hasreach its proper fusing temperature. The AC power to the fuser lamp is controller by comparing the targettemperature to the value from the thermistor. If the value from the thermistor is out of controlling range anerror will occur and power disabled. The table below lists the types of Fuser Errors that can occur:• Open Heat ErrorDuring warmup, if the Fuser Unit does not reach its proper operating temperature within a predeterminedtime an “Open Heat Error will occur. An error message will be displayed on the Control Panel alerting thecustomer. The engine stops all functions and keeps it at the error state until the issue is resoled by a qualifiedtechnician.• Low Heat ErrorAfter initial warmup had been achieved, if the Fuser Unit at any time does not reach its proper operatingtemperature within a predetermined time an “Low Heat Error will occur. An error message will be displayedon the Control Panel alerting the customer. The engine stops all functions and keeps it at the error state untilthe issue is resoled by a qualified technician.• Over Heat ErrorIf the Fuser Unit at any time exceeds the specified range [too hot] for proper operating temperature an “OverHeat Error will occur. An error message will be displayed on the Control Panel alerting the customer. Theengine stops all functions and keeps it at the error state until the issue is resoled by a qualified technician.2.2.5.4 LSULSU receives the image data from PVC or HPVC and makes 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 to the customer.• By Hsync : When the polygon motor is ready, the LSU sends out the signal called Hsync and it is 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 to the customer.LSU Error Recovery: If the LReady or Hsync error occurs, the paper is exited with no image onit. The engine mode is changed to recovery mode and the engine informs the main system ofthe engine mode. And the engine checks the LSU error. If the error doesn’t happen, the printingjob will be proceeding.