TA Triumph-Adler LP 4024 - Manual (Page 226)

Installing Option Units
D-11
8
Push the sorter down. The levers of the attachment legs are in the
lock position.
9
Connect the sorter cable to the printer.
When removing the sorter, unlock the attachment legs by releasing
the levers as shown in the figure one by one, and then lift the sorter.
Sorter Cable