Minolta PAGEPRO PS PLUS Manual page 245

Changing Cartridges
OK (LOCKED) NG (UNLOCKED)
Front cover lock release lever
READY
6-13
5. Gently close the front cover.
Do not slam the front cover
to avoid causing damage to
the printer.
6. Make sure that the front
cover is completely closed.
You will hear the sound of the
printer operating.
7. Wait until the sound of the
printer operation has stopped,
indicating that the printer is
ready.
Check that "READY" appears
on the message display.