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    Moderated By: Maxxwire
    Agoraquest Forum Index Amp/Receiver/Speakers/Connections/Cables
      
    DA4ES Front left channel clipping off at low volume... Dashboard
    Replies: 3 | Views: 3,215
    Last Reply: November 18, 2009, 7:58 pm

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    Author DA4ES Front left channel clipping off at low volume...
    SCHAustin

    Rank: Sony Fan


    Joined: Nov 15, 2009
    Posts: 1
    From: Texas

      Posted: 2009-11-15 01:09

    Hello all...I have had a DA4ES for about 5 years now and have always loved the unit.  I recently upgraded to a new TV, so I had to reconfigure my receiver cabling, move its' position, etc.

    Upon hooking everything back together, I noticed the my front left speaker channel wasn't producing any sound unless I crank the volume WAY up (like to 10 db or so...). Once I get it to produce sound, I can then lower the volume to a normal level, but I have to do this every time I turn the receiver on these days.

    The speaker connection is fine, but I must have fried some resistor when I moved the unit.

    Anyone have any ideas of what might be the culprit?  Is there an easy fix/ part to replace that I can DIY?  I have a decent repair technician in town I can send the unit to, but I am hoping I might be able to fix it myself.

    TIA,

    SCHAustin


       


    jehill
    Premium Member

    Rank: Sony Senior Advisor


    Joined: Mar 13, 2003
    Posts: 14283
    From: Sewell, NJ

      Posted: 2009-11-15 18:39

    Welcome to Agorquest!  You  probably blew a left channel output transistor, which usually takes out a resistor that acts like a fuse.  The left channel output transistors are IC 502 and IC503.  Check R526 in the vicinity of the output transistors.  If the value is >> 33 ohms, one of the two transistors is shorted and must be replaced as well as the resistor.  Also check R524 and R525.  If the value of either is >> 10 ohms, the resistor needs to be replaced.  Its a good thing that these resistors are in the circuit as they mitigate the consequences of a shorted output transistor.


       
    The-Ish316

    Rank: Sony Fanatic


    Joined: Apr 09, 2003
    Posts: 333
    From: Connecticut

      Posted: 2009-11-15 23:00

    Wow, jehill. Seems that are pretty familiar with this stuff. You always amaze me with your know how. I sure hope I never need your help in this way, but very thankful to know that you're there for us.

    Curious though, rather than use resistors as fuse, why not use a fuse? It would be easier to replace, right.
    DenMar


          
    jehill
    Premium Member

    Rank: Sony Senior Advisor


    Joined: Mar 13, 2003
    Posts: 14283
    From: Sewell, NJ

      Posted: 2009-11-18 19:58

    The advantage of using resistors is that you can determining the current through the resistor by measuring the voltage drop across it and then applying ohm's law (I = E/R).  I looked at the schematic closer and see that the 33 ohm resistors are not identified as protective resistors.  Instead, they determine the bias applied to an output transistor pair.


       
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