4240 new project

Discussion in 'Marantz Audio' started by wurlyman, May 15, 2018.

  1. wurlyman

    wurlyman Active Member

    Messages:
    254
    Location:
    Sacramento, CA
    Last week my ailing cousin gifted me with a non-working 4240 quad receiver. He said years ago his step son cranked it up and blew the left front channel. Today I opened it up and found a blown fuse on that amp. Now I want to start a restore on it but can't find a schematic with voltages on it. I've been here on AK and all through Hifi Engine. Anyone know of another source? it can be run as a two channel unit at 40 WPC. Drawbacks is it has no speaker relay protection and (unlike my 2325) all boards are hard wired. Bonus is it has the wooden case.

    I started today with just a complete cleaning, it was really filthy inside. Haven't De-oxed yet.
     

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  2. wlhd1610

    wlhd1610 Penny and her new friend Sponsor Subscriber

    Messages:
    2,422
    Location:
    Catskill NY
    Usually the original Marantz service manuals had the voltages highlighted in orange on the schematics.
    I have one in the shop and I can look in the morning.

    Bob
     
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  3. wurlyman

    wurlyman Active Member

    Messages:
    254
    Location:
    Sacramento, CA
    Thanks Bob, I'd appreciate that.
     
  4. wlhd1610

    wlhd1610 Penny and her new friend Sponsor Subscriber

    Messages:
    2,422
    Location:
    Catskill NY
    I looked and apparently Marantz didn't feel as generous in giving more detail in their quad unit schematics as far as voltage specs at various points as they did their 2 channel units.

    I do have a working 4240 here if that will help as you go through yours.

    Bob
     
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