Pioneer RM V2550BU - Manual (Page 81)

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INSTALLATION AND ASSEMBLY
7) Fix the screen frame.
Fix with a screw in one place only - the center of the lower edge of the system (see Fig. 3-4-48 and P53 [6])
Screw: Cross-recessed self-tapping screw (nominal diameter 4, length 12, cone point) (included
as accessory)
When there are 2 columns of screens
Screen frame fastener Fix with a screw in one of these places
Screen frame fastener
Screen frame fastener
Fix with a screw in one of these places
Fix with a screw in one of these places
When there are 3 columns of screens
When there are 4 columns of screens
(Fig. 3-4-48)