Brother MFC-9420CN User Manual page 149

8
Take all the toner cartridges out of the
machine.
9
Clean the surface of the laser unit with a
dry soft, lint-free cloth.
0
Open the laser glass cover.
A
Clean the surface of the laser glass with
a dry soft, lint-free cloth.
Troubleshooting and routine maintenance
WARNING
Do not use volatile liquids such as thinner
or benzene for cleaning the laser glass.
This might cause poor print quality.
B
Close the laser glass cover.
C
Put all the toner cartridges and the OPC
belt cartridge back in the machine. Do
not try to push or lock the new toner
cartridge in. It must rest loosely in the
guide rails.
D
Close the front cover and the inside
cover, and then close the scanner unit.
E
Plug the machine's power cord back into
the electrical socket first, and then plug
in the telephone line cord. Turn on the
machine's power switch.
C
C - 25