20 Most Recent Pioneer SX-315 - Page 3 Questions & Answers

what kind of noise do you hear? Most of these issues are created from feedback coming from other electrical devices. Move the speakers away from any electrical components, such as other speakers, TV, DVD Players, etc. and test again. This will help you eliminate those items as the cause of the noise. Let me know the results of this solution.

Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.

Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'nekkid'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

Check for loose speaker connections at the speaker as another possible root cause for intermittent shutdown.

Is the unidentified TV a sound source from the SX-315's perspective? Is it's audio output enabled whene the TV volume is down? Would the Cable Box be a BETTER source?

If the power to the outlet is still good, then I would suspect the power amp IC or output transistors are shorted, keeping the power from coming on. It's also possible that one or more of your speakers are bad feeding back to the receivers output connectors, especially if you were running speakers with a different power rating or impedance that your set is designed for. Hope this helps.

The unit is overheating, or at least thinks it is overheating.

Blow the dust out of the thing and see if that helps. If not, you have a thermistor that is bad or is going bad. Probably the thermistor nearest/on the audio amp transistor's heatsink.

hi,
First of all remove all the speaker connections from the amplifier. After that power the amplifier and check the protect show or not . if not, then any of the speaker is damaged. If then also it shows protect you have to check the amplifiers hardware.

AV receivers shows protect mode , when there is a hardware fault in side it. Its a warning that some thing is wrong.
Normally AV receivers show this when any of the output amplifier get some problem. there are six amplifiers in this AV receiver. May occur when the output diver transistors of any of the amplifier become shorted. if the output transistor get shorted this will lead to flow of current through the speakers. To prevent this there is a protection circuit for each channels. One combined output of this protection circuit is connected to the system control. when the any of the output amplifier fails, the protection circuit detects it and switch of the speaker and sent data to the system control. when the system control get this data it will give a warning to the customer through display that PROTECT.
You have to check the amplifier.
for that you need digital multimeter,soledring iron screwdrivers etc
open the amplifier , then power it on. connect the negative terminal of the multimeter any where in the chase( metal body of the amplifer). then connect the positive terminal to all the output transistors emitter pin one by one . the voltage should be bellow 0.5V. If any of the emitter of the transistor shows voltage more than 0.5V., then that amplifier stage is faulty. Remove the transistors and check it. if it is shot then replace with a new one.
after replacing the transistors do not power up the amplifier directly from the main. You have to put a bulb of 60 watts in serial.
You can do this easily remove the mains fuse. put the bulb in a holder. now you have to wire from the holder. connect one of it to the one end of the fuse holder and the other wire to the other end of the fuse holder. Why using a bulb is, if there is any further problem in the amplifier stage on which the transistors replaced, there is a possibility of the new transistor get damage. if we use a bulb in serial with its mains supply ,when any overload in the amplifier occur the bulb will drop the current, by lighting itself.
After connecting the bulb in serious power on the amplifier. watch the bulb. It should light for one or two second and go dim . if so check the display, is there is protect mode is on or not . if not and come back to normal operation ,then remove the power , remove the bulb insert fuse and check
connect the power and check.
If the bulb shows bright light then there is some component also faulty in the same amplifier. after removing the power you have to check again the amplifier stage of which the transistor is replaced, for any other faulty components.
ok

It's telling you it thinks the headphones are in. Remove them or troubleshoot why it thinks they're in.

Generally speaking, an amp protects itself from heat, shorts and overloads.

Overloads can be from excessive periods of high output and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced hands-on tech.

I found a website that allows a free download for that manual after you scroll down on the left. http://www.ps2netdrivers.net/manual/pioneer.sx-315/

I hope this helps

Overload = one of the speakers has a lower impedance than the amplifier can sustain, most likely it's shorted. Take them out one at a time till the message is gone and fix it if possible or replace it if not.

chances are the speakers are the problem. try disconnecting the speakers and turn up to the level where it cuts out,if it does not cut out chances are a defective speaker or speakers,usally midrange or tweeter

Turn it down to 1/4 while troubleshooting or you may destroy your speakers after you find that button, whatever it is.

Has it NEVER worked or did it suddenly start acting this way?

Do ALL sources act this way or only one(some)?

I'd look for a the Mute button or a Tape monitor incorrectly selected.

DVD audio straight in from its highest quality audio output. Use the stereo audio output to run straight to the TV for casual watching through TV speakers without the Pioneer involved.

A TV is just a glorified night-light, not a sound source - get its related audio from the Cable Box, ditto the highest quality

If this is only on ONE SOURCE doing this, it's trying to tell you the quality of the digital bitstream is marginal, meaning the connection is flaky.

The sequence of events is probably more like (cause) the digital signal degrades sufficiently to overcome correction; (effect) the PCM light drops out and sound is no longer decoded. Silence.

Consider the source, the media (as applicable) and its cable as suspects.

Get an RCA-to-Ipod headphone adapter and jack it into any available Line Level input on the receiver (CD, Aux...)