Denon AVR-3311CI Service Manual page 48

(3) PCB HDMI is detached from the chassis, and it puts it into the state turned inside out.
Please pave an insulation sheet that is larger than PCB HDMI under PCB.
b Connect the ground point of PCB to the chassis with a ground lead or the like.
PCB HDMI
Insulation sheet
(4) Connect the four extension jig cables.
PCB HDMI
PCB FRONT CNT
PCB SIDE CNT
PCB VIDEO
PCB INPUT
8 7 6
Insulation sheet
Ground lead
PCB VIDEO
4 3 5
PCB HDMI
1
2
PCB HDMI
9
10
11
48
Ground lead
Insulation sheet
Insulation sheet
PCB FRONT CNT