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Need help with my Sherwood S-7450 Stereo Reciever.

Discussion in 'Repairing Electronics' started by itshere, Feb 4, 2017.

  1. itshere

    itshere New Member

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    Can someone please look at the video and tell me how to fix this?



    Its normally fine but recently one or both sides suddenly go very choppy and the sound is distorted and you have to tap on the back to get the sound back to its original state. The nob that I am regulating is the balance, originally its in the center, as soon as I turned it to the left, it happened.

    I tried with another amplifier and didnt have this issue so Its definitely the Sherwood at fault here but what exactly should be fix and how much would it cost approx?

    Thank you for your help!
     
  2. xaxxon

    xaxxon New Member

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    The first thing I would do is to clean the balance "pot" (potentiometer). You would have to remove the top cover and spray contact cleaner into the balance pot (behind the knob) while turning the knob rapidly from side to side. You could use a contact cleaner spray from Radio Shack or other same type store. It's about a $7 gamble that this will fix the problem.
     
  3. DerStrom8

    DerStrom8 Super Moderator Most Helpful Member

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    There is definitely a bad connection somewhere. Whether it be the wiper of the knob potentiometer, or the input jacks, or the cables, something is not making proper contact. What were you wiggling near the end of the video? That seemed to have a major impact on the sound. My personal guess is that you've got some cold cracked solder joints on the input jacks. Best way to fix it is open the thing up and re-flow the joints with a soldering iron. I would need to see photos of the inside though, where the jacks are soldered to the circuit board.
     
  4. dave

    Dave New Member

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  5. Mark G. Cooper Sr.

    Mark G. Cooper Sr. New Member

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    Greetings Itshere !

    I highly recommend cleaning all of the controls as suggested by xaxxon, I concur with him. The product that I have been successfully using for many years is 'Deoxit'. It is a very good cleaner and contact deoxidizer. Additionally I further recommend following a thorough cleaning with a product known as 'ProGold'. If you use these products in the order mentioned, it will be a very long term fix ! These products are a bit pricey but WELL worth their cost ! You don't need much of either product to get the job done either. I realize that you've long since fixed your issue with the Sherwood but keep these fine products in mind for any future needs. You will be glad you did !
    Best regards, Mark
     

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