Dell 5330 Service Manual - Page 40

Product spec and feature 3) Transfer The charging voltage, developing voltage and the transfer voltage are controlled by PWM (Pulse Width Modulation). The each output voltage is changeable due to the PWM duty. The transfer voltage admitted when the paper passes the transfer roller is decided by environment recognition. The resistance value of the transfer roller is changed due to the surrounding environment or the environment of the set, and the voltage value, which changes due to the environments, is changed through AD converter. The voltage value for impressing to the transfer roller is decided by the changed value. Each voltage value is controlled according to 3.3.4.2 Timing Chart. 4) Fusing The 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 AD converter, the temperature is decided. The AC power is controller by comparing the target temperature to the value from the thermistor. If the value from the thermistor is out of controlling range while controlling the fusing, the error stated in the below table occurs. 5) Lamp Method Error OPEN HEAT ERROR LOW HEAT ERROR OVER HEAT ERROR Description - When warming up, it has been lower than 90ଇ over 45 seconds - Standby It has been lower than 130ଇ over 10 seconds - Printing After first page, : It has been 30ଇ lower than the fixed fusing temperature over 7 seconds. 1. It has been higher than 230ଇ over 3 seconds 2. It has been higher than 220ଇ over 20 seconds 3. It has been 10ଇ higher than the fixed fusing temperature over 3 minutes. 6) LSU The LSU is consisted of the LD (Laser Diode) and the polygon motor control. When the printing signal occurs, it turns on the LD and drives the polygon motor. When the detector detects the beam, Hsync occurs. When the polygon motor speed becomes strady, Lready occurs. If two conditions are satisfied, the status are not satisfied, the error shown in below occurs Error Type Polygon Motor Error Hsync Error Description Whenthe polygon motor speed doesn't become steady The polygon motor speed is steady but the Hsync is not generated Remark Error display Error display 2-29 Service Manual