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VI - 19
Trouble Action to be taken
(3) Light At the scanner
Check the following components:
- CIS unit
- Main PCB
At the printer side
l Replace the toner cartridge with a new one and print 4 to 5
pages. If the problem persists, proceed to the next step.
l Remove the toner cartridge and start printing. If printing
takes place, clean the toner sensor or replace the toner
sensor PCB.
l 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)
l 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)
l Clean the grounding contacts on the drum unit, gear drive
unit, and main cover. (Contacts • and ‚ in the illustration
given on page VI-23)
l Check the connection of the main–high-voltage flat cable.
l Replace the drum unit.
l Replace the high-voltage power supply PCB.
l Replace the main PCB.
(4) Dark At the scanner
Check the following components:
- CIS unit
- Main PCB
At the printer side
l Slide the wire cleaner tab to clean the corona wire inside the
drum unit.
l 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)
l Replace the drum unit.