Brother International HL-720 Service Manual - Page 72
Image distortion, Blurred at either side, Scanner LD
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I-12 Image distortion Possible cause Scanner Scanner LD emission failure Scanner motor rotation failure Scanner connection failure Step 1 2 Check Is the scanner unit secured to the frame normally? Is there any play? Is laser portion of the laser scanner motor defective? 3 Is the scanner harness connected normally? Is it coming loose? Result Yes Yes Remedy Secure the unit normally with the screws. Replace the scanner unit. Yes Connect the harness tightly. I-13 Blurred at either side Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Possible cause Leaning of the printer Drum unit Step Check 1 Is the printer placed horizontally? 2 Is the problem happened just after replacing the drum unit with a new one? Result No Yes Remedy Place the printer on a flat table. Shake the drum unit horizontally with care.