Brother DCP-1000, Service Manual, Page: 149 / 222

6-22
Trouble Action to be taken
(3) Light 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
in the illustration given on page 6-28)
Clean the high-voltage contacts for the developer roller on the
drum unit, main cover, and high-voltage power supply PCB.
(Contacts in the illustration given on page 6-28)
Clean the grounding contacts on the drum unit, gear drive unit,
and main cover. (Contacts and in the illustration given on
page 6-28)
Check the connection of the high-voltage power flat cable on the
main PCB and high-voltage power supply PCB.
Replace the drum unit.
Replace the high-voltage power supply PCB.
Replace the main PCB.
Replace the laser unit.
(4) Dark 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 in the illustration given on page 6-28)
Replace the toner cartridge.
Replace the drum unit.
Replace the high-voltage power supply PCB.
Replace the main PCB.