HP d640 Installation And User Manual page 11

Step 2 Slip the hooks on the back of the tray over the tray base. Use
the six screws (M4 x 12) and washers to attach the tray to the
tray base. See Figure 6.
The tray has six drilled holes for the screws.
Tray
Washer
Screw
M4 x12
Side view
Tray
Tray base
Figure 6 Attaching the tray to the HCO
Tray base
Chapter 1: Introduction 7