Hi. Iseem to have a very common problem with a sony amp, where the centre channel cuts out after a few minutes. Have seen other posts (lots on the 5.1 sony systems) where users experience the same issue. Have checked the wiring and speaker connections, all seems fine. If the channel cuts out, a lights slap on the amp seems to fix it most of the times. Sometimes a second slap is required. Have had this occur when nothing is playing on the DVD, like when a movie is paused - you can hear the amp clicking. Have read people talk about cold soldering problems somewhere inside the amp - I don't feel comfortable fidling around inside the box.
Stereo Tech: Sounds like you definitly have a broken solder connection on the main PC board. A bad solder connection is tricky to find somtimes if one is not familiar with exactly what it looks like (kinda like mt st helens with a ring around the top) if you attempt this yourself DO NOT MAKE A SOLDER BRIDGE you will open pandoras box. Good luck
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Try replacing the center speaker with one of the left or right speaker and run it for sometime ( do not connect the center speaker to any other channel ). If the system does not cut off the center speaker connection this way indicates a short in your center speaker. But with the L/R speaker if the system still stops working you have a hardware problem and will need professional help to fix. 5.1 amps are complicated and difficult to access even for an experienced technician.
I have seen the audio relays cut out on these. Try tapping right on them lightly to isolate the problem . Andrews Electronics in santa clara will supply you the parts. Larry's electronics firstname.lastname@example.org
Probably not the way to go about hooking it up. running speakers in series is not very practical with PA gear. The connections get messy to make as you need adaptor leads, and it is something that is seldom ever done.. When you use bridge mode it uses left and right channel together to drive the one output, combining the power. Best bet is to run the EMX5000 in stereo mode, and connect 1 speaker to
each channel. You may have been trying to reel in extra power from
using bridge mode, but the power amp stages in the EMX will only ever
be able to deliver the same MAX power whether in bridge or stereo. the best way to get maximum power and sound pressure levels from the unit is to hook TWO speaker boxes to each channel, you get the combined increase in efficiency of the extra speakers and run the output stages at 4 ohms to get absolutely all the power available If you have any questions about it, feel free to ask me, happy to talk to you further about it.
If your amp looks like it's going to work as normal (ie the front display lights up as it should etc), but then the amp goes into protection mode when the anti-thud circuit times out, then I know what's likely to be wrong.
It's one of the power amplifier channels which has gone faulty.
I just found this out after having this problem with my AVR-1906.
I took the amp apart and de-soldered the suspected channel power transistors (centre channel in my case).....and hey-presto! it fired up as normal (obviously the centre channel would be out of service).
I have ordered the replacement transistors from Farnell (UK) at a miserly cost of around £2-£3 each.
Just waiting for them to arrive.
An alternative is, if you don't use all your channels, take the transistors from a known working but not needed channel and swap them over with the duff ones.
I have seen this a few times. Try resoldering the pins on the voltage regulators. If you are not comfortabel with that, bring the unit to a service shop and report the problem as intermittant. Have them resolder the regulators and the surround output amp chips. This should cost only a minimal labor amount. That may resolve the problem. If not, then we'll need to look into the surround processing circuitry.
Hi. I have a SONY STRDB930 receiver and the rear speakers started cutting in and out, with a clicking sound. Eventually, the centre channel followed suit. I turned the receiver over and removed the slotted panel on the bottom. This allows you to access the circuit board, where you will find the solder joints belonging to some blue relays that you can see down on the bottom if you shine a torch in from the top. Check these, as I found 4 of them appeared to have broken. The solder blobs should appear shiny, without any dark ring around the pin. If they look dodgy, re solder them. I did this, and it appears to have fixed the problem, at least for now. These relays are what is clicking, and they turn the speakers on and off. If the voltage supply to the coil of the relay is interupted, by a faulty solder joint, for example, the relay will cut out.I hope my solution is not too late for you, I have only just gone online recently.
Happened across this forum looking for some remote info. Had a similar problem with my 945...main speaker outputs started to click off & on, no rhyme or reason. Found that the solder joints on the speaker output relays were cold (poor soldering). Actually happend twice, two different relays. Took me a while to find it, reflowed the solder, that solved the problem, over two years ago now. Are you able to dig into the receiver? Do you have a (good) soldering iron and some solder? If not take it to elec. shop and tell them to look for cold joints on the relays.
I lean toward an overhating condition since the unit does not go into protection mode right away, and then returns.
My thoughts are as follows...
1) The receiver needs better ventilation
2) The speakers are below the rated minimum nominal impedance, causing the amplifier to strain and overheat
3) There is a problem within the amplifier that is causing this problem - this is not user repairable.
I'd try another pair of speakers which are rated at 8 ohm nominal impedance and give it a trial. At the same time, monitor the heat output from the unit (note that modern amplifier sections do run hot). If the unit runs extremely hot at a low volume and still shuts down on 8 ohm speakers, it's time for service or replacement depending on value.