Minolta PAGEPRO PS PLUS Manual page 256

OK (LOCKED)
NG (UNLOCKED)
OK NG
(LOCKED) (UNLOCKED)
Changing Cartridges
21. Make sure that the button of
the fusing unit lock release
lever is pushed up as shown.
22. Close the rear cover until it
clicks, locking into place.
23. Make sure that the rear cover
lock release lever is pushed
up as shown.
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