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The audio out to the speakers stopped. Is there a resetable fuse or CB in the unit?

This unit has no output to the speakers. The headphone output is ok. The owner said that there may be a circuit breaker for speaker/amp protection built in, which may be bad. He didn't say if he hooked too many speakers to the unit and possibly damaged the amp due to too low an impedence load on it. Is a schematic & parts list available for it somewhere? I didn't think cheepo units like this had any built in protective devices.

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  • Anonymous Oct 20, 2008

    one of the speakers doesn't have a full sound and it has something to do with the speaker jack



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A good possibility is a bad solder joint on the circuit board likely to be close to the headphone jack. A circuit breaker is unlikely in this type of unit but if it had one it would likely affect the headphones too. I would look for a broken trace or cold solder joint near the headphone jack. The jack itself could also be bad.

Posted on May 07, 2009

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Just to let people know,if anybody still needs to know-:
it has been common practice in the a/v world (which includes boomboxes and other cass.players to include a swiched headphone jack.This is the reason your speakers switch off when you plug in h.p.'s.
If it is really an av model it will have more than one headphone jack.If this is the case,you most likely must use the #1 jack in order for the others to work.
Woody
dbldawgdan@aim.com

Posted on Apr 02, 2009

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One of the 3 fuses inside the vented back cover may have blown.

Posted on Mar 26, 2009

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Ask him for new headphones okay

Posted on Oct 16, 2008

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(I think) our bass player plugged from the output on a powered desk in to the input of our JBL MPro 18" sub (MP418SP) powered by crown Amplifiers. Now the fault light is constantly flashing and...


I'm assuming you mean he plugged an amp output (meant for a speaker) into the input of one of the Crown amps powering the sub-woofer. Right? Crown amps have good protection circuits and are high quality units. Some models have internal fuses but you didn't list a model here. If they are fused (or some kind of breaker) you should be able to see those by opening the top cover (amp off and unplugged). It is unclear if you tried to use the amp again after this incident.
Some Crown amps have protection circuits that will reset themselves after the fault is removed. In this case, you should remove both inputs and output (speaker) and power it up. If the amp doesn't light any protection lights or indicators, then turn it off and connect a known good speaker (not the subwoofer) and a source you can control. Set a low volume and see how it goes. You can really try either approach first depending on what's easier.

Jan 28, 2011 | Audio Players & Recorders

Tip

My Pioneer displays Overload


Overload is displayed when the amp draw is excessive, and can be caused by different faults.
when Overload is detected, the protection circuit will shut down the unit to prevent further damage.

The first thing to try is hard reset. Shut down the unit for about one hour to drain power completely.
This can fix minor problems that can cause overload, for example electrostatic charge accumulation on internal capacitors.

If that does not fix the problem, then you must find the fault.

Overload can be caused by shorted speakers, wrong impedance speakers, or by a contact on speakers wiring.
Check speakers connection and test different speakers with 6, or better 8 Ohms impedance.

Another test can be done by unplugging all speakers, and reconnecting and testing them one at a time, at a very low volume.

If the speakers are OK, then preamp, shorted input/output connectors, main power supply or faulty output transistors can draw too much amps causing overloading.

In that case it is recommendable contacting Pioneer at the number listed on the owners manual.

on Jun 22, 2009 | Pioneer VSX-D608 Receiver

1 Answer

My sony 771 won t play any sound -- not the speakers because doesn't come through headphones either. Just cleaned the lens for CDs last night, then this problem developed. Can see the amp bars moving, so...


The lit indication ("amp bars") proves that the aduio signal is getting through the unit's circuitry @ least to that point; lack of sound @ the spkr & headphones indicates the amplifier portion of the circuitry is either inoperative or disconnected from the load (i.e., either the speakers, or the headphones). A common cause of this type of problem cropping up unexpectedly is the headphone jack itself; in most products of this type, the audio path from the amplifier output to the speaker connection runs through the headphone jack, so the the speakers may be "turned off" when the headphones' plug is inserted into the jack. If the unit's owner uses headphones regularly, the most common problem to be found with the jack is loose solder connections to the printed circuit board's traces from the jacks' lead(s); in units with this problem whose owner's irregularly use the headphones, it's more common to find oxidization of the electrical contacts within the jack itself.

Dec 10, 2009 | Sony Audio Players & Recorders

1 Answer

MPA-101 Amplifier powers on, receives source signal, the fuse is not blown inside, but no sound comes out of the amplifier. The amp is pretty new, doesn't even have dust inside the unit.


Hello, is this a Radio Shack PA amp or Jamo amp? The unit is probably in "Protect" mode. Is this a PA system or a receiver...receivers have a protection circuit that will not let the speaker relay activate if the amplifier output section is shorted and sending voltage towards the speakers...so they won't fry!!The speaker relay should activate within 3 to 5 seconds if your output section is ok.

barneyluc

Oct 13, 2008 | Audio Players & Recorders

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Denon DRA-25/25L Stereo Receiver. On power up the display lights but no sound is produced by the unit. When working normally a click (relay?) is heard about 5secs after power up and normal speaker output...


Without looking at the schematics for this particular model, I'd surmise that the click is indeed a speaker protection relay. Generally this is fed by a number of different sense circuits that watch for power amp issues and/or excess speaker current and/or power supply output stability. Although the relays do indeed fail at times, generally it is not the relay that is at fault. If you have a scope and a schematic, you can check the various circuits that feed the relay for the exact cause. If not, you can do some experiments that might help deduce the problem: e.g. do headphones work when speakers do not, does the relay click on when no speakers are connected (or selected), etc. In my experience, it is most often the output transistor(s) in the power amp. But not always ;-)

Apr 15, 2008 | Denon Audio Players & Recorders

1 Answer

Onkyo 9555 protection circuit


Make shure your speaker wiring is solid hookup to amp and spekers (NO CROSSED WIRING). Also make shure speakers are not wired in parallel or the speaker impeadance will be to low and amp will kick out.Turn speakers off then hook up headphones and crank up volume then see if amp kicks out.If it does you have an internal overload and needs serviced. If it playes ok then you must have speaker problems or wiring.
GOOD LUCK
BIGREDl

Mar 26, 2008 | Audio Players & Recorders

1 Answer

80 watt impedance matching volume control


check your spekaer cabling first for any loose connection. if everything as usual then something is wrong with either your speaker system or the power output stage of your amp. you may call it a "circuit breaker" but it actually overload protection of the power amp so as not to damage speakers or amplifiers. have your speakers checked for burn coils. you can also try to remove or turn off speaker switch, turn on the power, level up the volume and see it the system still stays on and does not trip (as you called circuit breaker) if the unit remains on, then it must be your speakers. though it could also be a leakage in the power transistors of your output stage, it something a technical person have to do to check anyway.

redrivera

Mar 25, 2008 | Audio Players & Recorders

2 Answers

Nad c320


If your amp is under warranty, bring it to the nearest service center to have it fixed. But if not, and you know a little electronics, check for the bloated capacitor and/or a burnt resistor on the audio module and replace it. still not working, change the audio I.C. of the amp. If you don't know electronics, bring it to the electronics shop. Audio coming out of the headphone is different form the audio of the speakers. Sounds on your headphone is coming from the preamp circuit. That explains why the headphone audio is ok.




A Simple Thanks is Good Enough

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2 Answers

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1 Answer

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