Yesterday I was running my amp at a very loud volume. After some time, it shut off and a message "Protect" was displayed. Now 24 hours later, it still won't turn back on - the unit also remains incredibly hot. Any ideas?
Audio Players & Recorders - Marantz - SR-7400 Receiver
Answers & Comments
Protect means that there's a short on one of the amplifiers - the fact that is extremely hot is not helping, it shows the short is still acting and doing more damage as we speak.
Put the volume at 0, close the amp , take out all the speakers and wait for it to cool down then start it again - if the message is still there then one of the amplifiers is shorted and must be replaced (this is a major failure - let it to a trained repairman). If the message isn't there then one of the speakers is shorted - close the amp and connect them one at the time till the message reappears then junk the respective speaker and replace it with a similar one (make sure the replacement speaker has the exact same impedance)
The unit will not turn on at all. It's hottest on the left side of the amp. It's now 36 hours. Should I take it to a dealer for repair? Or could it just be a blown fuse?
If the receiver doesn't start even without any speaker plugged in then the problem is in one of the amplifier units - the short overheats the cooler, this is why the left side is hot. As i said this is a major malfunction, a visit to a dealer is mandatory.