Sony str-de525 system "protector" problem

If you want to connect output of Sony STR-DE525 to input of Pioneer CX-770. Then connect Video/Audio out (or Tape Rec Out) of Sony to CD/LD-VCR input of Pioneer.

Make sure none of the speaker wires are touching each other. If they are, it will short out the stereo which triggers protection mode and cuts out all of the sound.

try resoldering all open circuits then on power supply section check the electrolytic. capacitors. which are 80 volts, 10000microfarads also check regulators which 5&12volts (la7805&la7812) and I suppose things will workout

Do you hear any clicks? If not, the standby transformer or related circuitry is bad. If you hear 1 relay click...the audio output section is most likely the problem. The first click you hear is the main power relay...and should see display.. the second relay click is the protection circuit relay engaging to let audio to your speakers...if the second click is not heard (it should occur in 3 to 5 seconds) there are shorted output transistors or a shorted output IC trying to blow your speakers with 50 to 75 volts dc. The protection circuit monitors the speaker lines for voltage. They should always read milli-volts only...not even 1 volt.Anyway, good luck

Try disconnecting all the speakers from the back and turn the unit back on. If the "protector" display goes away, turn the unit back off and reconnect one speaker. Turn it back on and check for "protector". Repeat.

If you find that one of the speakers causes "protector" to appear, you either have a bad speaker cable or bad speaker. Try swapping each of those out to see what happens.

You most likey have a wire short on your center or rear surround speakers. The wire short will be between the + and - points of the speaker wire.

To find the problem speaker, disconnect one of the 3 speakers at a time from the back of the sony and see if the problem goes away. Once you identified the offending speaker, check both the sony side and speaker side for the short. The small wire strands are hard to see and it only takes one to trip the protection mode, so look carefully.

Hi,
Download service manual of STR-DE525 here and fix your receiver.
Must download all 4 files at web site.
Need further help, let me know.

nothing is connected at this time no speakers or in puts.....
posible component failure???? any common check points..this thing is pretty webbed with them

check/replace your speaker wires. If a wire came loose, it will go into "protect" mode and shut down, to protect from a short circuit.

Hi,
have you tried to get fuses from maplin electronics.