Brother International HL-1260 Service Manual - Page 84

I-5 Polka dots Possible cause Step Check Result Remedy Failure in static- 1 Is there any dirt on the static-charge eliminator? Yes Clean the static-charge charge eliminator eliminator. Static-charge 2 Is there continuity between the static-charge eliminator eliminator and the chassis? grounding failure Yes Ensure the grounding of the static-charge eliminator. Dirt on the transfer roller 3 Does print quality improve when the transfer roller is replaced? Yes Clean the transfer roller [Use dry lint-free paper (producing little paper dust) to clean the transfer roller. Never use solvents] and, if the dirt remains, replace the transfer roller assy. I-6 Dirt on back of paper Possible cause Step Check Result Remedy Dirt on the PF guide 1 Is there any dirt on the back of the paper feed Yes Clean the PF guide or the guide and the jam remove cover near the static- jam remove cover. charge eliminator? 2 Open the toner cartridge lid in the printer, pull No Go to Step 6. - out the EP-ED cartridge and remove the paper in the printer. Is there already dirt on the back of the sheet thus removed? Dirt on the transfer roller 3 Is there any dirt on the transfer roller? Transfer input signal error 4 Does the voltage at the 6 pin (HVT1) of the connector P6 on the main PCB change from 9V to 0V for about 0.8 seconds? Dirt on power supply terminal Failure in the transfer highvoltage circuit 5 Clean the transfer roller right end bearing, the check continuity between the transfer roller power supply spring and the terminal of the high-voltage transfer unit. Is there continuity? Dirt the fixing guide 6 Is there any dirt on the fixing unit inlet guide? Fixing roller 7 Are the upper and lower rollers of the fixing grounding failure unit securely connected to the chassis via the Fixing unit failure diode? Yes Clean the transfer roller and, if the dirt remains, replace the transfer roller assy. No Replace the main PCB assy or the harness. No Clean the contact to assure the continuity. Yes Replace the high-voltage power supply PCB assy. Yes Clean the fixing unit inlet guide. No Ensure the grounding. Yes Replace the fixing unit. VI - 7