Brother International DCP-1400 Service Manual - Page 160

Trouble (3) Light (4) Dark Action to be taken At the scanner Check the following components: - CCD unit - Main PCB At the printer side • Replace the toner cartridge with a new one and print 4 to 5 pages. If the problem persists, proceed to the next step. • Remove the toner cartridge and start printing. If printing takes place, clean the toner sensors (LED and light-receiver), check the sensor harnesses, and then replace the toner sensor PCBs. • Clean the high-voltage contacts for the transfer roller on the drum unit, main cover, and high-voltage power supply PCB. (Contacts 3 in the illustration given on page VI-28) • Clean the high-voltage contacts for the developer roller on the drum unit, main cover, and high-voltage power supply PCB. (Contacts 3 in the illustration given on page VI-28) • Clean the grounding contacts on the drum unit and main cover. (Contacts ® in the illustration given on page VI-28) • Check the connection of the main PCB and high-voltage power supply PCB. • Replace the drum unit. • Replace the high-voltage power supply PCB. • Replace the engine PCB. • Replace the main PCB. • Replace the laser unit. At the scanner Check the following components: - CCD unit - Main PCB At the printer side • Slide the wire cleaner to clean the corona wire inside the drum unit. • Clean the high-voltage contacts for the grid and charger on the drum unit, main cover, and high-voltage power supply PCB. (Contacts ® and 0 in the illustration given on page VI28) • Replace the toner cartridge. • Replace the drum unit. • Replace the high-voltage power supply PCB. • Replace the main PCB. • Replace the engine PCB. VI - 22