How to Fisher RS-90 fix AC hum

crwdns2935423:0crwdne2935423:0

crwdns2935425:01crwdne2935425:0

crwdns2935419:0crwdne2935419:0

crwdns2936315:0crwdne2936315:0

crwdns2936321:0crwdne2936321:0

crwdns2931653:01crwdne2931653:0

How to Fisher RS-90 fix AC hum: crwdns2935265:00crwdnd2935265:01crwdnd2935265:01crwdne2935265:0

My system emitted a very loud 50 Hz AC hum which made it impossible to hear music
It is caused by ground loops which occur if the receiver and the speakers have different ground levels
To equalize the ground levels at the back of the receiver is a screw to apply a ground cable. Fix a cable there

crwdns2944171:0crwdnd2944171:0crwdnd2944171:0crwdnd2944171:0crwdne2944171:0