Oki 87 - Manual (Page 108)

96 OKIOFFICE 87 User’s Guide
5 With the ridged side facing up and the gray lever on your right,
insert the toner cartridge into the image drum unit. Slide the left end
of the cartridge in first, then lower the right end into place.
Warning: Be careful not to insert the toner cartridge backwards
into the image drum unit.
6 Once the toner cartridge is in place, push the gray lever all the way
forward to secure it and release the toner.
7 Using the cleaning wipe provided in the package with your new
toner cartridge, gently wipe back and forth across the full length of
your fax machine’s LED array.