Question about Yamaha P4500 Power Amplifier 2-Channel

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I have a Yamaha M-70 amp. The left channel cuts out. A rap on the case gives an instant signal to the speaker. I've tried swapping the inputs and also the speakes without any luck. Any ideas? Thanks.

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  • Yamaha Master
  • 5,056 Answers

There is a bad soldering joint somewhere. Take the top off and follow the speaker connections from where the left speaker connects. Keep an eye out. If you can get the bottom off, look at the PC board solder joints. If in doubt resolder them.

Posted on Nov 09, 2010

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Rear left channel makes my speaker pop cuts in and ou at certain settings


Swap left and right speakers. Does it stay with the speakers if so you have a blown or damaged speaker. If not then swap input cables only. If it stayed with the speaker you now know the amp has a bad channel and needs repair. If it swapped again you either have a bad cable or issue with your source unit.

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Yamaha rx-v2500 receiver how to hook up speakers


HI,

Follow these steps to connect a powered sub woofer to your receiver: You typically have two options when connecting a powered sub woofer. Input (1) on the rear of the sub woofer would be used when connecting the sub woofer to the receiver using speaker wires. You would then connect the main speakers to the opposite end, or output or the sub woofer to the main speakers. Option (2) would be using RCA line level output jacks, input (2) on the rear panel of the sub woofer directly to the single sub woofer output on the back of an AV receiver. blank.gif

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NAD 3130 one channel stopped working, tip what to do first?


May not be serious,first with good channel playing move all controls and switches on the amp,Dead spots can occur on controls especially if they are rarely used.balance controls,tape monitor switches etc so work them all.If fault doesn't clear try headphones,switched sockets can cause problems.next swap input signal leads,left to right. and if still no good try swapping over speakers left to right.STILL no sound? its the amp.Time for tools and a test meter.You can look for blown fuses but its never a good idea to replace a blown fuse without testing the circuit first.may cause further damage and put up the repair cost

Jun 04, 2014 | NAD Audio Players & Recorders

1 Answer

Yamaha ax440 left channel down


Check both your input(rca) and output connections on the inside of the amp for any looseness or damage, solder connections and so forth.. However I think your power/output transistor(s) are burnt in the left channel

Apr 08, 2013 | Audio Players & Recorders

2 Answers

Yamaha rx 530 center channel cuts out


Thanks for all the suggestions guys.

I've tried using the balance for left and right speakers, and when the receiver is acting up with the right speaker having a low volume, I tried moving the balance all the way over to the right speaker. The right speaker volume will not increase in volume but the left speaker will decrease in volume.

Just to clarify, the center and the rear speakers are balanced. The issue only happens sometimes when I first power on the receiver I will have no center channel. If I leave everything alone for a few mins, the center channel will come on.

So it seems to me that something one the receiver is going. The question is, can anyone suggest a physical repair for the receiver for these symptoms?

Thanks

Jul 20, 2012 | Yamaha RX-V530 Receiver

1 Answer

Hello ! I'm not sure how to connect my kef psw 2500 sub to my yamaha amp. I've got a subwoofer out on my amp but there's 4 inputs on the sub and I don't no which one to use ! Please help as getting...


Just for clarity, I need to explain what the four inputs are on the KEF subwoofer. There is a left and right RCA input which is the input signal to the subwoofer and there is a left and right RCA output which is the High Pass output from the subwoofer.

On the back of the Yamaha receiver, you said you have a subwoofer output. This output is most likely the mono subwoofer part of the home theater system and can be used if you like. The left right signal input into the KEF is summed into mono so if you only connect one channel you will basically reduce the signal level by 1/2 (-3dB) but it will work fine.

Alternatively, if your Yamaha receiver has monitor out and monitor in, you can run the monitor output signals to the subwoofer and you can then run the high pass outputs from the subwoofer back to the monitor in. This will give you the subwoofer and provide a smoother signal matching with your audio system.

It is not always easy to connect the subwoofer up to an integrated receiver/home cinema system using the high pass channels of the subwoofer as you don't always have access to the analog output and input of the front channels. In this case, just use the Subwoofer output or just the monitor out only.

I hope this solution is helpful.

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1 Answer

Yamaha m70 amp and c70 pre-amp right speaker stopped working


First, lets's determine if it's the amp or the preamp...

Swap the Left and Right channel cables between preamp and the amp with each other.

Did it stay on the right? = amp problem.

Now on the left? Preamp or source.

Plug any Line Level device (CD?) directly into the amp inputs. Work now? Preamp problem.

ALL sources? Preamp - toggle all controls, especially a Tape Monitor to possibly wipe of any built-up oxides in them.

May 31, 2010 | Audio Players & Recorders

1 Answer

Signal Light Problems Yamaha P2500


Stereo amplifier = two channel..A and B.
1. Make sure that your stereo audio mixer has an output from LEFT going to amp channel A and output RIGHT going to channel B.
2. Check that the "Pan" control on your audio mixer is set to the 12:00 position.
3. Inputs to mixer...make sure the music/microphone input channels "Pan" controls are also set for 12:00 as well.

Jun 11, 2009 | Yamaha P-2500 Amplifier

1 Answer

One channal does not work


swap your RCA's input to the amp. Does the channel that works switch to the other side? If so, then the problem is either your rca wire, or in your source unit. (try the wire first). If the same channel still is out, then problem in the amplifier or speakers. Move to swaping the speaker wires, right to left, and left to right... If problem same, then trouble is AMP, if problem moved, then trouble is speaker. If amp, remove amp, troubleshoot amp... (there are 3 basic parts to any amp... Power supply, input section, and amplifier section...) You know it's not the power supply because the sound is good on at least one channel, and most alll amps use one power supply for all channels, so if one channel sounds good, then you can rule out the power supply. Second, when an amplifier fails (usually, 90% of the time or more) it will result in a shorted output transistor or some other nasty condition that will blow a fuse, or toast a supply almost instantly, and again, your amp powers up, so odds are that the amplifier section of the amp might be ok. (no guarantee here, it's just the odds...I'd say it's like a 40/60 thing.... This leaves you to focus on the input section. First rule out the simple things... bad wiring, (rca, or speaker), bad speaker, bad source. Then rule out the simple things at the amp... broken rca input connectors (inside the amp at the PCB where the solder is) or outside the amp, where the jacks may have been crushed. Then rule out broken speaker terminals, where they can be cracked inside at the board where the solder is in the same way. After all this, you need your amp serviced by a qualified tech.

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1 Answer

Sharp sd nx10_out signal trouble


Try all of the spaekers on the channel you know works. If all are fine, swap the speaker lines to test them. Is the input a DVD player on RCA cables? A bad signal cable from a component can be a source for problem. Connect the speakers directly to the amp(if possible) bypassing the sub box. If all works without the box, suspect bad crossover or in the self-powered boxes a bad amp.

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