Pioneer DRM-7000 Operating Instructions Manual page 23

Installation
6. Closing access doors
First check to make sure that all components have been
installed into place and all cables have been connected.
If this has been done, close the front and the rear access
doors, then the initialization of the changer mechanism will
begin.
When initialization has been completed, a message like that
shown below will be displayed on the LCD message window.
The first line of this message is used to indicate the status of
the disc changer mechanism, and the second line is used to
indicate the installed drive number and to indicate whether
or not a disc has been loaded into the drive in question.
Drive numbers are assigned in sequence from the lowermost
to the uppermost drive.
NOTE:
If the maximum number of drives appears on the LCD
message window is shorter than the number of drives
installed, open the rear access door and check the power
cables and the changer interface cables to all drives installed.
(See System administrator mode: Door submodes on p. 37
for information on how to open the rear access door.)
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