Pioneer RM-V2550 Manual page 76

INSTALLATION AND ASSEMBLY
9-screen assembly (work requires at least 3 persons)
1) Vertically connect screens 1, 4 and 7 (Fig. 3-4-39).
You should connect in the order 7+4, 74 +1.
Fix in a total of 4 places (left and right)
Alignment
Left/right alignment:
Forward/backward alignment:
Align so as to form a straight line
2) Mount the group consisting of the 3 vertically connected screens 1, 4 and 7 on the left-hand cabinet.
(as for RM-V2550S - see P50 [3])
Alignment
Align the left edge of the group of 3 vertically connected screens with the left edge of the cabinet
(Fig. 3-4-40).
Align so as to form a straight line
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Align so that the joints on the right sides of screens 1, 4 and 7
form a straight line (Fig. 3-4-39).
Align so that the screen surfaces (wrench surfaces) are at the
same height (Fig. 3-4-39).
Screen surfaces
(Fig. 3-4-39)
Cabinet
Screens
(Fig. 3-4-40)
Frames
Align so that screen surfaces lie
within the same plane