SOURCE: code for sony receiver model str d565 protect mode
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SOURCE: sony str de415 ( protect
You can try tighting the ground screws that hold the circuit boards and heat sink to the chassis, But more times than not it will need a pair of output transistors replaced (and a few resistors). This is a job for a pro. A rough estimate is $100-$130.
Sorry for the bad news.
SOURCE: I have a problem with Sony STR-de697. the problem
AM and FM have mute circuit that no signal comes thru antenna (hope you installed external antenna ) no sound generates at all ? with computer terminolgy "garbage in ,garbage out"
Additonally , If this happens on CD,DVD or casette as well
What about speaker selector? A or B ,(based on your speaker wiring ) is properly selected or not?
SOURCE: Sony STR-D665 receiver display flashes "PROTECT"
The most common problem found on FixYa for Audio Video Receiver's is:
My
receiver say's "Protect" or turns on then off. What's wrong? Seven
times out of ten it is a shorted speaker or speaker wire. To
determine your exact problem, the first step is to disconnect all
speaker wires "at your receiver" Next: Turn the receiver back on. If
your receiver still says "protect" or turns off, it needs to be
serviced. If your receiver stays on; reconnect your speakers one at a time and power back
up after each speaker. You may find that after reconnecting all speaker
wires it works! Most commonly the small braids of wire from the + to the
- have touched and have caused the problem. In some instances, you
noticed the problem only when turning the volume up. either way, make
sure the exposed wires to your receiver are no longer than 1/2" long and
are completely under the screw down terminal or slide in.
When you've found the wire or speaker with the problem, your receiver
will go back into "protect" At this point, disconnect the wire from the
speaker at the speaker that may be causing the problem then test again.*
Note* Make sure speaker wires do Not touch each other as this Will
cause a short! If you turn the receiver back on and it stays on, you now
know the problem is in your speaker itself. To test your speaker, you
will need a multimeter. Set it to ohms resistance and touch the speaker
terminals, if there is a short internally the meter will read "1......"
If it's an analog meter, it will peg to the right. There's your problem.
Now, within any speaker there are quite a few possibilities as to what
could be causing the problem. Most common is a blown coil and the
speaker needs to be replaced. Some speakers have
internal crossovers (usually floor standing speakers) and may have a
shorted or burnt board (usually very visible brown burn marks on the
board) and can possibly be repaired if your handy with a soldering iron.
Now, if you disconnect the speaker wire at the speaker and it still
says "protect" Check your wire for the obvious cut or nail thru
the wire if possible. If your system has wiring that runs
behind walls, you may need to use your meter again. Disconnect the wire
at both ends, keep the ends separated, put your meter on ohms resistance
and touch probes to the + and - wires at one side. If the meter pegs to
the right or reads "1...." the wire is shorted and needs to be replaced
or repaired at the short. Hope this helps.
SOURCE: my sony STR-DE345 amp says "protect" and there is
The manual says it thinks there is a short circuit on the amplifier output side. If it still says Protect after disconnncting all the speakers wires there is an internal problem. Take it to a hands-on tech.
If the problem disappears, you had a short. Attach speakers one at a time to isolate the cause.
http://www.retrevo.com/support/Sony-STR-DE345-Receivers-manual/id/387bh943/t/2/
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