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Auxiliary amplifier circuit board diagram

I have a JVC Hi-Fi THREE IN ONE MUSIC CENTRE MF-1845R that had a problem with its auxiliary amplifier. I took it to a local technician who stole the circuit board for the amplifier and improvised another that wasn't as strong as the original one. Can anyone help me with the circuit diagram since i have found a technician that i know and is willing to fix the problem as soon as he gets the specifications?Thank you in advance for the effort and kind heart of helping me

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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  • 1 Answer

SOURCE: Circuit Diagram of Yamaha RX-V490 requied.

I have the schematics in PDF file, but how can I send it to you?

Posted on May 28, 2007

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starlet4life
  • 89 Answers

SOURCE: RE JVC music centre, model

Usually its just a rubberband that gives up- take one from an old tapedeck etc...;)

Posted on Sep 29, 2008

SOURCE: technican't

One thing i had discovered is there s an interlock with the bottom cover. if the center is not grounded with the cover off, the unt will not completely turn on.

Posted on Oct 26, 2008

  • 357 Answers

SOURCE: Hello, sorry for my english,

Try searching somewhere like DiploDocs . com website for a service manual. It seems to me you know what you are doing, all you need is a service manual :-)

Best Of Luck

Posted on Sep 03, 2010

  • 1 Answer

SOURCE: Hello, I have found a Sansui

Hi!

I have the same deck. Did it come with rammophone or are you using your own grammophone?
I have it with original grammophone and I don't need a remote control, I don't even have it. You just turn on your grammophone and it is automatic, just place the needle on record and it should switch and play automatically. That is if you have connected the wires right (two wires for sound, one for automation, all in the same area).

If you have separate grammophone, I am assuming you just need to place two wires into the separate phono channels and it should work. There is just no automatic detection, so you have to swithc to mono manually: There is a button on the right, beside Volume control "tape to CD" or something.

To play the tape, just simply push the play button on the bottom, should work, or you could try tape to cd button off and see if it detects automatically when tape is inserted.


Currently I have it taken apart and there is tape detection system apparent. Its quite automated reciever, which sucks, because all kinds of problems appear and it is difficult to fix.

On my Sansui, the tape player starts winding slowly when pressed play button. And the tape motor seems to be on always, even when the tape is not used, and the motor is really loud. --Need to find a solution to this problem. And I hate it switch to radio/FM every time the record stops. Plus the original grammophone doesn't work correctly, it is supposed to take off the needle when record reaches an end, but it just pushes the neelde to the holder... over the record..... "screeeeech".

Posted on Dec 08, 2010

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OK......if you dont know "where to locate on the amp circuit board"....then you shouldn't be attempting to repair it yourself.

If you should accidentally short 2 solder pads together with a meter lead, you WILL cause very expensive damage to the amp.

The smoke you will smell will be coming from the amp and your wallet.

I would strongly suggest that you take it to a repair shop. Diagnosing and troubleshooting an amplifier is best left to the seasoned pro's. Not because I am bragging, it is because they are a complex thing, and there are no moving parts to watch and let your brain " figure it out ". It never changes the look, whether it is idling or running all out. You must understand transistor theory and implimentation.

As far as crackling and sputtering, it sounds like you have a pre driver problem, or a biasing issue. Neither of which should be too terribly expensive to fix, unless the amp is really old, ( +25 years ) then all the transistors become suspect, because, contrary to popular belief, they don't last forever.

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