Yamaha RX-V673 Service Manual page 23

When checking the P.C.B.s:
• Place the P.C.B.s (with rear panel) upright. (Fig. 4)
• Connect the heatsink and rear panel to the chassis with a ground lead. (Fig. 4)
• Reconnect all cables (connectors) that have been disconnected.
• When connecting the flexible flat cable, be careful with polarity.
Rear panel
Ground lead
Heatsink
Fig. 4
RX-V673/HTR-6065/RX-A720
Ground lead
Chassis
Rubber sheet and cloth
23