Figure 30: Install The Chassis (1); Figure 31: Install The Chassis (2) - Owon SDS Series Service Manual

Pull the cable through the hole in the chassis as the figure below.
9. Fan
Remove the 4 screws marked in the figure below, lift off the fan.
Section 5: Maintenance

Figure 30: Install the chassis (1)

Figure 31: Install the chassis (2)

30