Wrecked and blown up 4400 - Resurrection

Discussion in 'Marantz Audio' started by Jailtime, Nov 15, 2017.

  1. Jailtime

    Jailtime Standin' on a corner Subscriber

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    I won this 4400 a few months ago, seller said everything worked, just needed some TLC. Sure looked nice in the pictures, working scope and all. That's until it was poorly packed and damaged in transit, 1" total of bubble wrap surrounded with air pillows don't cut it for a 4400. I noticed a bent corner on the faceplate, and a couple crooked feet. Did a quick internal inspection, didn't see anything too amiss.

    I powered it up on my DBT, none of the dial lights came on, and soon after, R812 on the power supply let out the magic smoke. Found the damage to the chassis upon disassembly, the area around the volume pot is crushed in about 1/16". I'd assume something is shorting out in there to cause R812 to burn up. That's as far as I've come, further diagnosis is in the near future.

    Always wanted a black faceplate 4400, I'll have the opportunity now since the original faceplate is warped badly. I'll have to pull the front part of the chassis to straighten it. Figure out why magic smoke is escaping, fix that, then on to restoration. It's a tall order to take on this mess, I haven't done a resto for over 3 years now. Stay tuned for fun and games!
     

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  2. tonebells

    tonebells AK Subscriber Subscriber

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    I hate when that happens!

    Tony
     
  3. Steven Tate

    Steven Tate AK Subscriber Subscriber

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    Looks nice inside. So much room! <:eek:>. Good luck straightening it out.
     
  4. rBuckner

    rBuckner Luv 2 Restore Subscriber

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    Ugh, hate that damage thing! I have a 4400 on hand and I have one waiting for me to restore. Not looking forward to it as it's a lot of work. You'll love replacing the speaker relay. :no:
     
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  5. catrafter

    catrafter Marantz Specialist Subscriber

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    Kyle, if anyone can get it going, you can!

    Tom
     
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  6. bktheking

    bktheking Gitter Done!

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    What a stupid design.
     
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  7. Jailtime

    Jailtime Standin' on a corner Subscriber

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    Yeah, I did a 4400 around 5 years ago. The relays were definitely the worst part of it. This was supposed to be a "take it easy" kind of winter project, now it's a total tear down to straighten the chassis.
     
  8. Makis

    Makis New Member

    Messages:
    35
    When I got mine I wanted to do the restoration myself.A simple look in the interior when I took the case out convinced me that I am no way qualified to make it happen.Even the fuse that needed replacement was tricky to replace,so no. Out of curiocity,how much would a full restoration with no major damages cost in the USA? Here in Greece I will pay around 200€ for recaping,cleaning etc
     
  9. tranguru

    tranguru Active Member

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    200 euro seems reasonable to me - the unit is complex and requires a lot of work and good parts are expensive.
     

     

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  10. Jailtime

    Jailtime Standin' on a corner Subscriber

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    She's alive! I tore it all down, straightened the chassis, and stuck it back together enough that things wouldn't short out. Replaced the smoked R812, checked around the P800 board for any other damage, none found. That DBT saved my bacon.

    Brought it up on my DBT again (of course), first without the amps connected, all was well, even have some dial lights back. Connected the amps, and got the lovely sound of relays engaging. Now I can really dig in!
     

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  11. jstang

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

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    Good job dude!

    What a shame that imbatard shipped it that way....

    You can restore the relays by drilling a small hole in the cover and spraying deoxit in at the contracts, work the speaker switches....then seal the drill hole.

    But keep that between just us....
     
  12. Jailtime

    Jailtime Standin' on a corner Subscriber

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    I'm probably gonna do it that way. I replaced relays on a 4400 before, I'd rather not do it again.
     
  13. jstang

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

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    Relays on a 4400 are about the same amount of fun as a colonoscopy.....
     
  14. tarior

    tarior Dirty pool, old man? Subscriber

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    I'd rather have the colonscopy. At least they give ya' some good drugs.:D:D
     
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  15. tranguru

    tranguru Active Member

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    Great Job!
     
  16. zebulon1

    zebulon1 Getting behind on work. I need help? Subscriber

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    The receiver remains in great cosmetic shape for this long until a butt head packs it with pillows. WTF!
    It makes me cry!
    There is no excuse!
     
  17. Jailtime

    Jailtime Standin' on a corner Subscriber

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    Rebuilt the P800 power supply board today, all tested well and dialed in 35V. 3 of the 16 caps were completely dried out and corroded, the legs fell out when I removed them from the board. Replaced small transistors with KSC2690 and KSC945C, the large Sanyo 2SD331s were replaced with MJE15032G. Deoxed and polished all the pins as well.
     

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  18. jstang

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

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    You know this already....but...

    That board is the 4400s weak link....guess they just plain ran out of space.

    No way to avoid rebuilding it....

    If you extend the leads of the high wattage resistor .... Helps get heat away from the rest of the components.
     
  19. rBuckner

    rBuckner Luv 2 Restore Subscriber

    Messages:
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    Lookin' good! You might consider upgrading the dual rectifier diodes with MUR1620CTG/CTRG as the polarity requires.
     
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  20. Jailtime

    Jailtime Standin' on a corner Subscriber

    Messages:
    11,348
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    Thanks for the tips, nice to have those reminders when I've forgotten everything over the last 5 years.

    Rebuilt the phono board, got that sneaky little VD1212 this time, series 1N4148s took it's place. Transistors all replaced with KSC1845. Also recapped the AM tuner and phase converter board today.
     

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