Sony DNW-A100 Maintenance Manual page 19

(15)Be sure that the distance between the intermediate rails
on both sides (left and right) satisfy the specifications.
Intermediate rails
A = A' = 416 mm
(16)Tighten the hexagon socket head cap screws (four
positions, total eight) attaching the outer rails to the
rack temporarily using the L-shaped hexagon wrench.
DNW-A100/A50/A45
DNW-A100P/A50P/A45P
A
A'
1-6. Rack Mounting
1-7