Brother International HL-1260 Service Manual - Page 83
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I-3 Completely blank Possible cause Step Check Result Remedy EP-ED cartridge 1 Does printed image improve when the EP-ED Yes Replace the EP-ED cartridge. cartridge is replaced? Development input signal error 2 Do the pins 3, 4 and 5 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? P6-3 pin (DBAC) --- Change in voltage from 6V approx. to 0V just when a sheet of paper is fed from the registration unit. P6-4 pin (DBDC) --- Change in voltage from 9V approx. to 0V just when a sheet of paper is fed from the registration unit. P6-5 pin (DNSTY) --- Change in voltage to 2.5V just when a sheet of paper is fed. Replace the main PCB assy or the harness. Failure in power 3 Is there any dirt on the cartridge side supply terminal development terminal of the transfer unit and on the terminal of the high-voltage power supply development unit? (is there continuity between them?) No Clean the terminal to assure the continuity. LD failure Failure in 4 Does print quality improve when the scanner unit is improved? development high-voltage circuit Yes Replace the scanner unit or the harness. No Replace the high-voltage power supply PCB assy. I-4 All black Possible cause Step Check Result Remedy Beam detection 1 Is the printer hung up with the PRINT message Yes Replace the scanner unit or error remaining on the display even after a printing the harness. when only a copy is printed? EP-ED cartridge 2 Does printed image improve when the EP-ED cartridge is replaced? Yes Replace the EP-ED cartridge. Charging input signal error 3 Do the pins 1 and 2 of the connector P6 on the main PCB have the following value respectively when a sheet of paper is fed from the MP tray? P6-1 pin (HV1AC) --- Change in voltage from 6V approx. to 0V just when a sheet of paper is fed. P6-2 pin (HV1DC) --- Change in voltage from 9V approx. to 0V just when a sheet of paper is fed. No Replace the main PCB assy or the harness. Dirt on power supply terminal Failure in the charging highvoltage circuit LD failure 4 Is there any dirt on the cartridge side charging terminal of the transfer unit and on the terminal of the high-voltage power supply charging unit? (is there continuity between them?) No Clean the contact to assure the continuity Yes Replace the high-voltage power supply PCB assy and, if the problem is not resolved, replace the scanner unit or the harness. VI - 6