Question about Yamaha RX-V740 Receiver

2 Answers

Check SP wires

Getting check sp wires and protection circuit shuts down reciever..checked and ohmed out all sp wires.. all ok. Reconnected still shuts dowm same note ..check sp wires. next steps?

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  • Anonymous Mar 13, 2014

    Check sp wire

  • Anonymous Mar 18, 2014

    shuts off by itself

  • Anonymous Mar 23, 2014

    i checked my relays fueses ok when i start the engine i check the red wire going to the steering no cutent i checkedfor broken wires checked plugs in for bent pins no luck

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  • Master
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If you checked wire carefully in high ohm reading and confirm no internal short circuit.-please follow me:-1-disconnect all speakers cables from receiver and check if it is fine-try to connect your speakers one by one until you find the bad one.if it is still shut down you will have a problem inside receiver itself and needs service center to fix.
-it maybe speaker check it also one by one with good known cable.

Posted on Jul 16, 2008

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  • Master
  • 4,234 Answers

There is an internal short that is being detected. This is probably a defective output transistor that is somewhat sensitive to heat. This should be a straightforward repair with a parts cost in the $20 range. Add in the local labor rate for the total cost.

Dan

Posted on Jul 16, 2008

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Kenwood kdc-mp142 why does it shut down when


Have you checked your speaker wiring as it could be you have some wires crossed ie: negative feeding the positive side causing the shut down & check the Ohms if at high volume you are trying to drag to many Ohms it will also cause the built in amp to shut down to protect the system dont keep incresing the volume as the strain will do damage

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Pioneer vsx 515 overload and shuts down what can i do to fix this problem.


hi,
First of all remove all the speaker connections from the amplifier. After that power the amplifier and check the overload (protect) show or not . if not, then any of the speaker is damaged or you have to check the impedence of your receiver and speakers. It will be written on the rear side of both receiver and speakers in ohms. PIONEER recommend to connect 8 ohms speakers in to this AV receiver. If you are using 6 ohms speakers you have to do some setting in the AV receiver.For that do the following

1. With the receiver in standby, press STANDBY/ON while holding down the SPEAKER IMPEDANCE button.( Each time you do this, you switch between the impedance settings: )


SP 6 OHM - Use this setting if your speakers are rated at 6 Ohms

SP 8 OHM - Use this setting if your speakers are rated at 8 Ohms or more


You are not able to connect speakers with impedence bellow 6 Ohms with this receiver. Becuse the AV receivers impedence range is 6 - 16 Ohms.
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

Jul 27, 2011 | Pioneer VSX-515 Receiver

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I have the Harman Kardon AVS 235 reciever and once it gets to a certain volume (which is not too loud) it shuts down and goes into protective mode. All speaker wires are fine and no bare wires touching.


dust inside the receiver? prolly not too much.

how about ohmage? ensure that the speakers are the proper ohmage OR higher (at least prolly 8 ohms, 8? ) and ensure that you do not have multiple speakers hooked up to any channel, as two 8 ohm speakers in parallel on the same circuit would reduce the ohmage to 4 ohms.

also ensure that you do not have any fried vioce coils in any of your speakers (woofers, mids or tweeters). a fried voice coil could reduce the ohmage as well. if necesarry, use a multimeter to test each speakers ohmage, an 8 ohm speaker should not test any lower than 6 ohms at rest with a multimeter.

if its not an ohmage issue, and all speaker wires are verified fine, then it is the amp itself- prolly an integrated circuit chip, which are usually not repairable by the user.

Mar 09, 2011 | Harman Kardon AVR 235 Receiver

2 Answers

Receiver shuts off says check sp cable


The reciever is telling you that their is a problem with the speaker cable. I sugges pinpointing which speaker cable it is by turning the system off then unplug all the speaker cables and then plug one in at a time, waiting inbetween allowing enough time for the system to pick up the bad sp cable. Then once you find the correct cable check it from the reciever to the speaker for any signs of breakage, shorts, or damage. Check the speaker connections from wire to speaker and from the wire to the reciever. If all that fails then check the speaker itself, try swaping another one in the position to see if the problem is solved. Hope this works.

Mar 06, 2011 | Yamaha RX-V2700 Receiver

1 Answer

Receiver shuts off. says check sp cable


Hi,
sp stands for Speaker.
What it is asking you to do is check for any type of short circuit on the connections to the speakers. This could be at either end. It is, in effect telling you that there is a wiring fault in that area and it has detected it because there is not enough electrical resistance in the circuit. hence, a short circuit. Wires touching each other. Examine the back of the receiver with a good flashlight and examine the connectors on each speaker. Note: it may also be responding to a broken cable.
I hope this helps,
Good Luck,
Mark

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1 Answer

Receiver shuts off intermittently, when you turn it back on it says "check SF wires". What are SF wires?


It's "check SP wires". It means (do I have to say it?) Check the Speaker Wires for short circuits.

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I get my receiver to about 65% volume and it turns off


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I hope this helps.

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