Marantz SR7009/U1B Service Manual page 81

(3) Remove the DIGITAL PCB from the chassis and turn it over.
Place an insulation sheet larger than the PCB underneath the DIGITAL PCB.
Connect the earth of the PCB to the chassis using an earth wire, etc.
b
Insulation sheet
BN28B
BN27B
BN24C
BN26C
From AMP PCB
BN64C
BN23C
BN21B
PCB HOLDER
CN706
CN481
HDAM
CHASSIS-HDMI CONNECTOR
CHASSIS-COMPOSIT CONNECTOR
81
CUT
PCB INPUT
PCB VIDEO
PCB DIGITAL