Brother International HL-1260 Service Manual - Page 86

I-11 Dropout Possible cause Step Check Paper failure 1 Is recommended paper used? Result Remedy No Use recommended paper. Paper soaked 2 EP-ED cartridge 3 Transfer roller 4 failure Transfer input 5 signal error Dirt on power 6 supply terminal Failure in the transfer highvoltage circuit Is paper soaked? Yes Store the paper in packing paper to keep it from soaking. Does printed image improve when the EP-ED Yes Replace the EP-ED cartridge. cartridge is replaced? Is there any dirt on the transfer roller or is it deformed? Yes Clean or replace the transfer roller assy. Do the pins 7 and 8 of the connector No P6 on the main PCB have the following value respectively when a sheet of paper is fed from the MP tray? P6-7 pin (HVT2) --- Change in voltage from 15V approx. to 0V about 1 second after a sheet of paper is fed. P6-8 pin (HVT3) --- Change in voltage from 9V approx. to 0V when the voltage at the pin 7 changes from 0V to 15V. Replace the main PCB assy or the harness. Clean the transfer roller right end bearing, the No Clean the contact to assure check continuity between the transfer roller the continuity. power supply spring and the terminal of the high-voltage transfer unit. Is there continuity? Yes Replace the high-voltage power supply PCB assy. I-12 White vertical streaks Possible cause Step Check Result Remedy Toner bias 1 Do white vertical stripes appear like a band? Yes Rock the cartridge, set it again in the printer and check again the print quality. Drum damage 2 Does print quality improve when the EP-ED cartridge is replaced? Yes Replace the EP-ED cartridge. Transfer roller failure 3 Is the transfer roller damaged or deformed? Yes Replace the transfer roller assy. Dirt on the reflecting mirror 4 Is the problem solved when the scanner unit Yes Clean the reflecting mirror is replaced? with a cleaning tip or replace the scanner unit. VI - 9