2215B repair and recap

Discussion in 'Marantz Audio' started by cortico, May 5, 2018.

  1. cortico

    cortico Active Member

    Messages:
    284
    Location:
    New York
    Hi guys,
    My friend asked me to take a look at his receiver, he complained about having distortion and low volume on the right channel on a otherwise super clean and good looking receiver.

    Besides the bad channel there is a momentary hum when amp is powered up, it seems like a power supply cap charging up. There is some cap sleeve shrinking on Power supply (C807, C805).

    After troubleshooting I realized the channel issue was caused by a dirty selector switch, it’s good now and sounding great! Simple fix :D

    The bias voltage sets up well and stays stable at 20mv using the loops on the emitter resistors.

    I believe the wrong lamp where installed at some point and the heat melted the housing. I have replaced those with the correct spec since a have a few spares for my 2270.

    I will move forward and replace power supply caps with nichicon FG. I believe the big 3300uf filter on PS and 2200uf capacitors on the main amp can increase a bit, is there any other strategic where is recommend to upgrade?

    I have 2 Mundorf M-lytic AG 4700uf 40v in my parts drawer, I ordered the wrong size for my 1060. I would love to use them on the 2215b. It would be perfect for the power supply 3300uf location but original voltage rating is 55V... any thoughts?

    This is exciting!
    Here are a few pics:
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    Last edited: May 15, 2018 at 10:21 AM
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  2. Steven Tate

    Steven Tate AK Subscriber Subscriber

    Messages:
    2,536
    Location:
    N. Richland Hills, TX
    I’m not an expert, but generally speaking, a drop in voltage rating is not recommended. The 4700 uF rating is probably OK, but I wouldn’t put a 40V cap where a 55 was before. I hope you keep posting on the progress. I love to learn from other folks’ experience. :thumbsup:

    Steve
     
  3. paul_ral

    paul_ral Active Member

    Messages:
    212
    I use Nichicon PW and United Chemicon in power source, Wima, Nichicon KL and Muse ES in path signal Elna Silmic II and Nichicon FG, MUSE or KA for the others, according to their size. If it is possible raise capacitors one step in voltage.
     
  4. mbz

    mbz AK Subscriber Subscriber

    Messages:
    1,750
    Location:
    Melbourne, Victoria
    The service manual has guiding voltage of 53Vdc, so a 40V cap would be a bad idea, yeah the AG's would have been nice.
    I like Nichicon KW's for the small amps, 6800/63V? or 4700/63V. However plenty of others, use UCC for larger amps, don't like Nichi KG as much.
     
  5. cortico

    cortico Active Member

    Messages:
    284
    Location:
    New York
    You got to love these, super easy to work on!
    I have ended up using a mix of Nichicon FG, KG for power supply filter and Elna SilmicII... sounds sweet!!
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  6. Steven Tate

    Steven Tate AK Subscriber Subscriber

    Messages:
    2,536
    Location:
    N. Richland Hills, TX
    Nice work! Paired with the right speakers, that should sound sweet.
     
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  7. mbz

    mbz AK Subscriber Subscriber

    Messages:
    1,750
    Location:
    Melbourne, Victoria
    That looks easy, currently working on a Yamaha CX-1... Got a 2215B in the shed, you have inspired me, to be paired with some budget altecs (106dB)
     
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  8. Fairlane

    Fairlane AK Subscriber Subscriber

    Messages:
    1,622
    Location:
    West San Jose CA
    Nice work. The 2215b is a fine sounding unit that fly's under the radar I think.
    Had one here for a while and regret selling it...
     
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  9. cortico

    cortico Active Member

    Messages:
    284
    Location:
    New York
    Thanks! On power supply, I replaced H806, H807 and H808 with UF4005 diodes, all resistors measured within tolerance.

    This may be normal but let me ask, before recap I notice a momentary buzz when the amp is powered on, it still does it after recap. It looks like in rush current charging the capacitors takes about 2-3 seconds and fades off. Any ideas?

    Can’t get the stereo light to work as it should, I tried adjusting the potentiometer R310 on the tuner board with no success...
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    Last edited: May 14, 2018 at 9:42 PM
  10. catrafter

    catrafter Marantz Specialist Subscriber

    Messages:
    6,035
    Location:
    Montana
    This thread might help with your stereo lamp problem.

    Tom
     
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  11. rBuckner

    rBuckner Luv 2 Restore Subscriber

    Messages:
    9,547
    Location:
    Prescott, Arizona
    Nice work Nuno!! The momentary buzz is normal on these. I'm not sure if it's the main filter cap or something in the power supply.
     
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  12. EastPoint

    EastPoint Factory Code No. 4200 Subscriber

    Messages:
    4,382
    Location:
    Milwaukee, WI
    I just rebuilt a 2215B. The turn-on buzz is normal. Don't forget to replace the tantalum caps on the amp board. They're those little blue blobs. I had issues with the stereo on mine too, and fixed it via the thread that catrafter suggested.
     
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  13. cortico

    cortico Active Member

    Messages:
    284
    Location:
    New York
    Ok, still trying to bring the stereo light up. adjusting R302 on tuner board has no effect.

    The other inputs have good stereo sound and separation but on the tunner it’s mono only...
     

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