Brother FAX-8650P service manual

	Trouble	Action to be taken
(3) Light	At the scanner
	Check the following components:
	-	CIS 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 sensor or replace the toner
		sensor PCB.
	•	Clean the high-voltage contacts for the transfer roller on the
		drum unit, main cover, and high-voltage power supply PCB.
		(Contacts ƒ in the illustration given on page VI-23)
	•	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 VI-23)
	•	Clean the grounding contacts on the drum unit, gear drive
		unit, and main cover. (Contacts • and ‚ in the illustration
		given on page VI-23)
	•	Check the connection of the main–high-voltage flat cable.
	•	Replace the drum unit.
	•	Replace the high-voltage power supply PCB.
	•	Replace the main PCB.
(4) Dark	At the scanner
	Check the following components:
		-	CIS unit
		-	Main PCB
	At the printer side
	•	Slide the wire cleaner tab to clean the corona wire inside the
		drum unit.
	•	Clean the high-voltage contacts for the grid and corona wire
		on the drum unit, main cover, and high-voltage power supply
		PCB. (Contacts … and † in the illustration given on page
		VI-23)
	•	Replace the drum unit.

VI - 19