Connect with us

Yamaha integrated receiver SR-300 subwoofer not working

Discussion in 'Troubleshooting and Repair' started by Golffan, Nov 20, 2014.

  1. Golffan

    Golffan

    3
    0
    Nov 20, 2014
    Sub woover has stopped working. FM receiver and sound bar still sounds good. Any thoughts of what part has failed and how I can test the part appreciated. Nearest service shop is 100 miles away and wants $50.00 to check it. If I can't fix it myself I'll do without the Sub. Ideas appreciated.
     
  2. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

    8,393
    1,266
    Nov 28, 2011
    The service manual is available at http://elektrotanya.com/yamaha_ns-b380_ns-br300_ns-p705_sr-300.pdf/download.html

    Here's the subwoofer output circuitry. Click the image to enlarge it.

    SR-300 subwoofer output stage.png
    It's based around IC303, a TAS5342LDDV (data sheet at http://www.ti.com/general/docs/lit/getliterature.tsp?genericPartNumber=tas5342&fileType=pdf) which is available from Digi-Key for about USD 8 (if it turns out to be faulty) - see http://www.digikey.com/product-detail/en/TAS5342LDDV/296-34186-5-ND/1905184

    You should start by checking that the 12V and 26V supply rails are present, then check the DC levels at the output pins. There's a fair chance that replacing the IC will fix the problem, but it's an SMT device and replacing it is not for the inexperienced!
     
  3. Golffan

    Golffan

    3
    0
    Nov 20, 2014

    Thanks for your reply KrisBlueNZ.
    Looks too complicated for me to fix. Guess I'll do without the sub until the system has more problems then replace it.
     
  4. Golffan

    Golffan

    3
    0
    Nov 20, 2014
    KrisBlue,

    I will risk 8$ to try this part. Do you know if the part plugs in or has to be soldered in? I have a little experience in electronic repair.
     
  5. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

    8,393
    1,266
    Nov 28, 2011
    It has to be soldered in, and it's an SMT (surface mount technology) device with pretty closely spaced pins. Google SMT desoldering and SMT soldering to get some guidelines on how to remove the old one, and how to reinstall the new one. I suggest you practice on some broken piece of modern equipment that has SMT parts in it. It's easy to damage the circuit board.
     
  6. elebish

    elebish

    177
    12
    Aug 16, 2013
    Check speaker with one lead disconnected. Should read 4, 8, or 16 ohms if good. Also check all voltages at IC 303 and touch surface of IC with unit powered up to see if it is cold or hot. Cold would mean an open and hot above 150f would indicate a possible short. Replacing IC303 would require someone with experience at smt replacement. NOT for the faint of heart! Ed.
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-