TroubleAction to be taken
(3) LightAt the scanner
Check the following components:
- CIS unit
- Main PCB
At the printer side
lReplace the toner cartridge with a new one and print 4 to 5
pages. If the problem persists, proceed to the next step.
lRemove 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.
lClean 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 VI-27)
lClean 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-27)
lClean the grounding contacts on the drum unit and main
cover. (Contacts ? in the illustration given on page VI-27)
lCheck the connection of the main PCB and high-voltage
power supply PCB.
lReplace the drum unit.
lReplace the high-voltage power supply PCB.
lReplace the engine PCB.
lReplace the main PCB.
lReplace the laser unit.
(4) DarkAt the scanner
Check the following components:
- CIS unit
- Main PCB
At the printer side
lSlide the wire cleaner to clean the corona wire inside the
drum unit.
lClean 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)
lReplace the toner cartridge.
lReplace the drum unit.
lReplace the high-voltage power supply PCB.
lReplace the main PCB.
lReplace the engine PCB.
VI - 21 |
ACEC
BROTHER
