Brother International IntelliFax-4750 Service Manual - Page 197
[ 5 ] Print-image related, the drum unit, main cover, and high-voltage power supply
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[ 5 ] Print-image related If the received or sent image has any problem, first make a copy with the facsimile equipment. If the copied image is normal, the problem may be due to the remote terminal; if it is abnormal, proceed to the following checks: Trouble (1) Completely blank Action to be taken At the scanner Check the following components: - CIS harness - Main PCB - CIS unit At the printer side l Clean the high-voltage contacts for the developer roller on the drum unit, main cover, and high-voltage power supply PCB. (Contacts ƒ in the illustration given on page VI-27) l Clean the grounding contacts on the drum unit, main cover, and high-voltage power supply PCB. (Contacts • in the illustration given on page VI-27) l Replace the toner cartridge. l Replace the drum unit. l Check the connection of the laser flat cable on the main PCB. l Replace the main PCB. l Replace the laser unit. l Replace the high-voltage power supply PCB. (2) All black At the scanner Check the following components: - CIS harness - CIS unit - Main PCB At the printer side l Clean the high-voltage contacts for the grid and charger on the drum unit, main cover, and high-voltage power supply PCB. (Contacts „ and , in the illustration given on page VI-27) l Clean the charger (corona wires) itself. l Check the connection of the laser flat cable on the main PCB. l Replace the drum unit. l Replace the high-voltage power supply PCB. l Replace the main PCB. VI - 20