Asus AP140R - Manual (Page 18)

18 Chapter 2: Hardware Setup
2.1 Opening the Chassis
The chassis is a 1U form factor designed for easy assembly and
disassembly, making the installation of internal components very
convenient. At the top of the chassis is a rotating lock that secures
the cover to the chassis.
Rotating Lock
Unlock the Cover
To unlock the cover, turn the rotating
lock clockwise until the triangle mark
points to OPEN.
OPEN
Triangle Mark
CLOSE
Slide the Cover
Slide the top cover toward the front for about an inch, then lift it up from
the chassis. The top cover of the chassis has locking tabs at the rear
end that connect to the inner side of the back panel. Make sure to
disengage the locking tabs before lifting up the cover.