Marantz 2220 B Output transistors location

Discussion in 'Marantz Audio' started by newguytom, Mar 10, 2018.

  1. newguytom

    newguytom Active Member

    Messages:
    153
    Hello AKer's. I picked up a 2220B off of CList today and here is what I found:
    No sound on any mode
    I pulled the output transistors for testing and they all check out as being OK.
    I use the manual to verify that the transistors are in the correct position
    I plug in and power on and the amp smokes and the fuse blows instantly
    Is the manual incorrect?

    My understanding is that the location should be:
    H001 H004
    NPN NPN
    D188 D188

    H002 H003
    PNP PNP
    A627 A627

    Is this correct? I am kicking myself for not paying close attention but my excitement got the better of me
     

     

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  2. Velox

    Velox Just a bug hunt, Ripley.. Subscriber

    Messages:
    28
    Location:
    Des Moines, Iowa
    Hi there, I just worked on a 2220b and have a photo I took of the output transistors after I remounted them:

    8a.jpg
     
  3. glen65

    glen65 Member

    Messages:
    4,382
    Location:
    Richland county, Ohio
    Here's a pic.. but you'll need to go through the amp board to see what else was damaged.
     

    Attached Files:

  4. newguytom

    newguytom Active Member

    Messages:
    153
    Awesome - thank you both! Thankfully I have a replacement set on hand. It seems that one of the freed itself from its mount post from the bottom of the board when I removed the heat sink for a cleaning. I haven't worked on a unit in far too long and I am kin of rusty. Thank you for the assist glen65 and Velox. Fortunately, I already had intended to rebuild the board on account of a few bulging caps.
     

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