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?

Posted by on

  • 1 more comment 
  • 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

×

2 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 682 Answers

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

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • 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

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

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

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

Jan 21, 2011 | Yamaha RX-V2700 Receiver

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.

Apr 25, 2010 | Yamaha HTR-5650 Receiver

1 Answer

Problem with sp cable (yamaha)


The speaker cables are the ones that clamp or tighen down on the back of the reciever. All the spkr wires have to have the positive and negative leads correct. Also not aven one little strand of wire can be touching another conductor or you will have this problem. Make sure all leads are correctly ran and hooked up positive to positive and negative to negative from the back of the reciever all the way to the speakers. This should solv your problem.

Jul 25, 2009 | Yamaha HTR-6030 Receiver

1 Answer

RX-V2600 shuts down


Try checking your speaker impedance. If you have 6 ohm or 8 ohm speakers make sure the impedence matches. On the front panel hold down button that says "straight effect" while pressing Stanby/On button, it will default to SP IMP 8 min, press straight effect again, if you have 6 ohm speakers, then press Standby again to exit setting. Also, double check your speaker wires to make sure they are all connected, and none are loose.

I hope this helps.

Mar 31, 2009 | Yamaha RX-V2600 Receiver

4 Answers

Receiver is shutting down.....


check the speaker wire that must be broken in between...

Feb 21, 2009 | Yamaha RX-V661 Receiver

1 Answer

Unit turns itself off after diplaying code "check SP wire"


My guess, guess, check CLOSELY the SPeaker wires - "Check SP wire" make sure all of the bare portion of the wire is into the terminal. No bare wire touching another bare wire both at the receiver and at the speakers. Also, if the wiring is not continuous, check all connections of speaker wire. Disconnect all but one, play it like that. If no problem, label that as good, disconnect another for several days, when one shuts Rec. off, check wires closely for that speaker.

Jan 23, 2009 | Yamaha HTR-5650 Receiver

9 Answers

My Yamaha HTR-6050 shuts off at random times and says "Check SP Cable"


That is a check the speaker wire error, caused by a short or perceived short. If you look at the back of the receiver you may see 1 strand of the wire loose, they are very hard to see sometimes. You may use banana plugs as it is painful to get everything hooked up without a few loose strands.

If there is still the issue check your speaker connections for the same issue. If they are in ceiling/wall speakers disconnect them all then plug them in one at a time to narrow it down.

If the issue persists perhaps one of your speaker wires has a short somewhere, could be a misplaced drywall screw from hanging a picture, or a carpet tack strip, or a pet deciding it was a nice chew toy.

If you are completely sure it is none of those then I would say it is a bad speaker or receiver. Try changing in and out known good speakers/receivers if you have access to them to see which one it is.

Good luck

Feb 03, 2008 | Yamaha HTR-6030 Receiver

7 Answers

"Check Speaker Wire" error on my Yamaha Receiver


found the source of the problem with "Check SP Wires"! to solve it is necessary to check each speaker connected to the device Yamaha on the rear panel (red and black) using the device for determining the number of ohms, which shall not be less than 4 ohms, in large passive speakers experienced in Amfitone AU-027, the result showed that left at 0.45 (7) ohms, and the right-hand column, as such, no.
The successful test ... and good music!

Mar 13, 2007 | Yamaha HTR-5790 Receiver

Not finding what you are looking for?
Yamaha RX-V740 Receiver Logo

1,993 people viewed this question

Ask a Question

Usually answered in minutes!

Top Yamaha Audio & Video Receivers Experts

Larry Stiles
Larry Stiles

Level 2 Expert

286 Answers

jonpoint

Level 1 Expert

4 Answers

Are you a Yamaha Audio and Video Receiver Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...