Brother HL-2600CN Service Manual page 186

1.2.5 Cleaning the Dustproof Glass in the Optical Unit 2
The dustproof glass in the optical unit 2 should be cleaned according to the periodic
maintenance cleaning cycle set out in Table 6-3.
<Tools to Prepare>
1) Cotton cloth (2 3 pieces)
2) Cotton swab (2 3 pieces)
<Cleaning Procedure>
1) Turn off the remote switch and power supply, and unplug the power code.
2) Open the paper exit unit cover 2 and the paper exit front cover 2.
3) Remove the toner cartridges and the OPC belt cartridge.
4) Remove the cover of the dust-proof glass from the optical unit 2.
5) Clean the surface of the dustproof glass with a cotton cloth and swab.
6) Replace the dustproof glass by aligning the marks on the optical unit 2 and the
dustproof glass, ensuring it is locked correctly into place and cannot move.
CAUTION
NEVER use alcohol or similar solvents for cleaning the dustproof glass, otherwise it
will be a cause of image failures.
Dustproof glass
SL2 Inner cover C
Laser WARNING label
Fig.6-12
VI-15