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Yamaha DSP A-1000 input selector switch not working properly

Hello, my aging A-1000 still works good except when playing DVD movies. It appears to be a lose contact at the input selector switch. If I giggle with the input selector switch the sound comes back for a while. But it repeats the problem by "no sound from right speaker to static sound" and it is annoying especially watching movies. I recently made the DVD input in the back of the unit to LD (because A-1000 was made pre-DVD era, I have been using TV/DBS as a DVD source.) It now works better than before, but still the problem comes back. The strange thing is this rarely happens when playing music CD thourgh the same DVD player (effect off). Would you agree that it is the input selector switch that is the problem? If so, where can I get a replacement switch? Thanks.

yamaha a-1000

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  • ferova Jun 14, 2008

    when I press the input selector switch, it starts moving back and forth not getting to the input entry I want. I have to do it manually. Eventhough some times the input selector switch continues to be unstable. What can I do to fix this problem?

  • Anonymous Jan 11, 2009

    Same problem no solution so far


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  • 38 Answers

I did not post that....and why would fixya be asking the poster of a problem for a solution?????
Bug? Pls delete these posts moderator.

Posted on Mar 10, 2008

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SOURCE: Yamaha DSP A-1000 input selector switch not working properly

flying yeti.... yup... it's definitely your input switch. im from yamaha service before at saudi arabia. that is a normal trouble specially in high humidity places. you can only get a replacement at yamaha service though. their newer model are better they dont use contact switches nomore.

Posted on Mar 18, 2008

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Hi. my YAMAHA DSP-A1000, works well only the input selector does not to select. its all static noise and does not seem to lock onto an mode. i have to use the tape 2 monitor to hear music.

The INPUT SELECTOR is defective. Order part number VT148000; it costs $51.04. As of 14 Jan 2011, the part is on backorder until the later part of Feb 2011.

Register online to order the part yourself, or you can place your order by phone at the Yamaha Parts Department at (714) 522-9011 or (888) 892-6242, Monday - Friday, 7:30 am - 5:00 pm PDT.

I hope this post also clarifies the problem from the posts above.

IMPORTANT: After installing the new Input Selector switch, place the knob at 1230 position (between LD and DAT/Tape 1) BEFORE turning the unit ON. The Yamaha Tech said this procedure ensures the input source is properly programmed and aligned.


Dec 12, 2010 | Yamaha DSP-A1000 5-Channel Amplifier

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I have a Yamaha Natural Sound Stereo Receiver RX-750 (purchased maybe around 1992-1993?). The input selector switch doesn't seem to be working properly. No matter which input I select, the sound is fuzzy...

Hi cfipp
You could fix this problem with a quick squirt of CRC 2-26 into the function selector switch connected to the knob you are wriggling. This will sort out the problem. If you need further advice, feel free to ask me. I will help you. 
regards robotek

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Yamaha dsp a1000 left channel cuts out sometimes in surround mode, sterio works fine

The easiest way is to buy the new part online and replace it - cost about $50US.

However, if you're up to it, this problem is fixable without the need to buy any parts. The selector switch has four sets of spring contacts which need to be bent slightly to increase the pressure on the pads against which they press, but it's a tedious job and not for the faint-hearted.

Here's what you need to do:

Open the case (6 screws) and also free up the front panel (9 screws).

You'll see that the switch consists of a PCB, an aluminium box and a motor. Remove the two screws holding it to the front bulkhead. take oyr the small "L" shaped circuit board that overlays it. A plastic pop-in holds the bottom of the switch PCB and the switch assembly can then be removed entirely.

Next you will need to remove the aluminium switch box from the PCB. Firstly de-solder all the connections which hold it in place. Now pull it clear.

Here is the MOST critical part of the job: inside the switch box you'll see four circular plastic wafers - these contain the contacts you need to fix and you'll need to bend the tangs which hold the shaft assembly onto the housing and then the tags which are holding the wafers in place. Your difficulty will be making sure that the wafers go back on the shaft with the rightr alignment and that the wafers go back in the same order.

Take some digital pictures while the wafers are still on the shaft with the orientation of the KNOB included - if you mess this up (I did) the job becomes horrible! Also, mark each wafer with a number 1-4 because there are three different kinds Once you are comfortable that you can replace the wafers in the proper rotary configration with respect to the shaft, remove them individually and pop out the gray plastic cores and bend the spring contacts upwards so that they will go back pressing more firmly against the pads. Now reassemble, and good luck!

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Yamaha DSP A-1000 input selector switch not working properly

As that unit is well over 5+ years old, I seriously doubt the part is available any longer. I doubt that you will even find a used part, and even if you do, it will probably be as bad as your switch. As I have worked on audio for over40 years, I would use LPS 2. It is a lubricant. Do not try this with WD40 or similar. Just spray the LPS on the wafers, or through any open holes in the switch. You just need a little. If you just squeeze the button, you will see just a little bit of foam. That is all you need. No more; no less. Rotate the switch from from left to right and back again multiple times. Try that. BTW, no manufacture uses these mechanical switches any more.The controls are now called Rotary Encoders, which basically are inputs to a display microprocessor IC(a computer within the new product) which in turn controls the inputs of a switching IC. It's the same as your old switch, just electronic, and much more complicated. If you need more information, or would like to inquire about repairing your unit, please visit my website at You may contact me there. Thank you.

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