TA Triumph-Adler FAX 925 - Manual (Page 107)

English
Chapter 8 - Problem Solving 99
4. Remove the new toner cartridge from its package and gently shake
it from side to side to distribute the toner. Then carefully peel the
white plastic tape from the bottom of the toner cartridge.
CAUTION:
Be careful not to insert the toner cartridge backwards into the image drum
unit.
5. With the ridged sides facing up and the coloured 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.