Marantz 500 Restoration, Here we go...

Discussion in 'Marantz Audio' started by Salbreth1, Feb 15, 2017.

  1. Salbreth1

    Salbreth1 AK Subscriber Subscriber

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    Hey guys,

    Its been a while but I'm starting a build on this guy and thought you might be interested. This unit was running when before I received it, but things are never that easy. When I powered it up there was an immediate smoke storm and it popped the 15 amp fuse. Challenge accepted.

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    bryans12v likes this.
  2. bryans12v

    bryans12v Marantz Junkie Subscriber

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  3. blhagstrom

    blhagstrom Mad Scientist, fixer. Subscriber

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    :lurk:
    Been there, done that, wishing you luck.
     
    Mag84ilfully likes this.
  4. Steven Tate

    Steven Tate AK Subscriber Subscriber

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    I'm glad it's you and not me, but this will be fun to watch. :lurk:
     
  5. Bert 1100

    Bert 1100 Well-Known Member

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    Planquiri !
  6. Richs_Trains

    Richs_Trains AK Subscriber Subscriber

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    :lurk: love these!
     
  7. rBuckner

    rBuckner Luv 2 Restore Subscriber

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    Bunch of rubberneckers! Say, move over and let me see..... :biggrin:
     
    KutzlerTrans and bryans12v like this.
  8. Steven Tate

    Steven Tate AK Subscriber Subscriber

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    Y
    You have to buy some popcorn first. :D
     
  9. Jailtime

    Jailtime Standin' on a corner

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    I'll pull up a chair for this one.
     
  10. tonebells

    tonebells AK Subscriber Subscriber

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    :lurk:I am in!
     
  11. airtime

    airtime Super Member

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    Hey,can I add my worthless two cents in here too! I think that amp needs fixing - eh?

    I'm not familiar with the 500 but it looks interesting.

    Buckle up boys because it's going to be a bumpy ride.
     
  12. Salbreth1

    Salbreth1 AK Subscriber Subscriber

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    Location:
    Bennington, VT
    There's a lot of popcorn in this room. Ill order more...

    So I discovered the problem. I assume the bottom cover was off before I got it because a wire was caught between the cover and chassis coming from the inrush relay to the 30w resistor. Took out the fuse but that's it. The resistor blew out the side but oddly enough, its still good. Something tell me the resistor was like this already.

    So I reattached things and brought it up slow. Lucky me, all is well. I went through the PITA adjustment procedure and everything regulated nicley! One driver board has a few different transistors on it and 2 caps replaced but everything else is original. Some of the traces on the replaced parts are a little rough. But this thing is gonna get the royal treatment and sing beautiful melodies once again. :music:


    Something tells me this resistor has seen better days.


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    Last edited: Apr 20, 2017
  13. Steven Tate

    Steven Tate AK Subscriber Subscriber

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    So, entering the first turn, the audio gods are smiling on you. Let's hope they stay happy. :D
     
  14. bryans12v

    bryans12v Marantz Junkie Subscriber

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  15. KutzlerTrans

    KutzlerTrans Jennie & I with Buddy and Barney. Subscriber

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    i am sure, Sal, that you will do a fantastic job on this bad machine:thumbsup:

    Think it will put your 300dc to shame??
     
  16. bluefan

    bluefan AK Subscriber Subscriber

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    Ahhhhhh... I think it just needs recapped... :) ....and DeOxit
    Give me my PoPcorn
     
  17. jstang

    jstang Honey,I can't hear you... Subscriber

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    It ain't easy..... I have one on the bench right now too.

    Jk
     
  18. Salbreth1

    Salbreth1 AK Subscriber Subscriber

    Messages:
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    Location:
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    The amp boards look good, everything is original. I plan to replace all the outputs as per the service bulliten. Looks like two were replaced on one channel as well as a driver.
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    Ds2000 likes this.
  19. Salbreth1

    Salbreth1 AK Subscriber Subscriber

    Messages:
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    Location:
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    So just got back to this and finished the relay board, mostly. All TO-92s, diodes and capacitors were replaced. The relay contacts are in great shape so I put a mirror back on them and soldered them back in. Somehow I deleted the 8200uf caps from my cart so I'm waiting for them... Amplifiers are next!

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    Attached Files:

  20. Salbreth1

    Salbreth1 AK Subscriber Subscriber

    Messages:
    377
    Location:
    Bennington, VT
    One channel stripped and cleaned. Pots flushed and lubed. The few resistors I'm leaving are dead on, but all the carbons are out as well as the emitter resistors.

    0308171346.jpg

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    MBuras likes this.

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