2270 Very slow relay click

Discussion in 'Marantz Audio' started by Stratman, Jun 8, 2018.

  1. Stratman

    Stratman AK Subscriber Subscriber

    Messages:
    25
    I've just acquired a 2270. The relay clicks after about a minute. I hear a gradually building buzz from the relay until it engages. The audio sounds like a receiver that needs to be serviced but is mostly fine.

    The voltages on the power supply and amps are fine. Is there anything I should try to fix before I dive into recapping the power supply and changing the relay?
     

     

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  2. Jailtime

    Jailtime Standin' on a corner Subscriber

    Messages:
    11,371
    Location:
    Velva ND
    Power supply caps, a new relay, and relay driver transistors should do the trick. Install new differential pair transistors in the amps while you're at it.
     
    catrafter and wlhd1610 like this.
  3. mbz

    mbz AK Subscriber Subscriber

    Messages:
    1,825
    Location:
    Melbourne, Victoria
    C807(220uf/10V), R816(390k) perform the timing for the power ON mute.
    Check each are still OEM and not replaced with anything significantly larger.
    Maybe C807 is leaking->longer to charge up, it's a long shot. Once charged
    C807 should turn ON H809 and H810, consider replacing these transistors.
     
  4. sregor

    sregor AK Subscriber Subscriber

    Messages:
    3,359
    Location:
    Mass
    +1 on previous post. Also C806 (10 uF 50v) can be bad. Will cause low supply voltage for protection circuit only, and slow or no operation and can be the cause of the buzzing too. . Can also be a tired relay but I've not seen it in these. YMMV
     
  5. llwhtt

    llwhtt Super Member

    Messages:
    1,365
    Location:
    SoCal
    I vote for C806.

    Craig
     
  6. tranguru

    tranguru Active Member

    Messages:
    150
    Location:
    Brussels
    same here

    luck
    R
     

     

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