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Schematic needed for a 25 year old radio

Discussion in 'Electronic Repair' started by Dan Street, Mar 5, 2006.

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  1. Dan Street

    Dan Street Guest

    If anyone knows how I can obtain a schematic for a Harman/Kardon Model

    receiver, I sure would appreciate your letting me know. It's a solid state

    stereo receiver with a 50 watt RMS per channel amplifier, manufactured
    around 1982.

    Thanks in advance for your help.
  2. tvguy

    tvguy Guest

    I have it. But before I send it to you let me know whats wrong with
    this unit and what you have checked on it already. I don`t like to
    give schematics out to people that don`t know how to use them. So the
    more you tell me that you know then the better it is for you.
  3. What is wrong with the unit? I have a .pdf scan of the manual but it does
    not have a schematic. If you need the alignments or block diagram only it
    might be useful.

  4. Dan Street

    Dan Street Guest

    Thanks Leonard,
    I inherited the Model HK 380i from our son and would like to restore it. He
    apparently had it worked on by someone who butchered it, but it seems to be
    a fine piece of equipment..

    I know the 4 power transistors and shorted/open and have ordered the NTE
    replacements. A dual 0.33 ohm, 3 watt resistor is missing in one channel
    (but present in the other channel... that's how I knew the value) and a
    couple of driver transistors are missing. I have no clue as to what kind
    they are. I've checked with Harman/Kardon and they don't have service
    manuals this old.

    Other than that, the FM/AM works up through the discriminator and operates
    the dial pointer, which indicates received signal strength.

    The maunal would be helpful with the block diagram. I appreciate your offer
    and would like to see the manual.

    Dan Street

  5. Boiler_81

    Boiler_81 Guest

  6. DaveM

    DaveM Guest

    Thanks for the download link, but no schematic.... and I know what I'm doing

    Dave M
    MasonDG44 at comcast dot net (Just substitute the appropriate characters in the

    Never take a laxative and a sleeping pill at the same time!!
  7. Mike Berger

    Mike Berger Guest

    I think Harmon Kardon pulled their schematics from their website one or
    two years ago. I'm sorry that I didn't download them all first, but
    it's rare for things to disappear from the Internet.
  8. DaveM

    DaveM Guest

    Yeah, really sad when they provided them at one time but for whatever reason,
    they decide to withhold significant information. But, I guess since it's their
    data, they can do with it as they wish.
    Still sad.

    Dave M
    MasonDG44 at comcast dot net (Just substitute the appropriate characters in the

    Never take a laxative and a sleeping pill at the same time!!
  9. They still provide online access to manuals and schematics to dealers and
    authorized servicers. This particular manual is avaialable on their site,
    which is impressive since most companies don't bother to go back and scan 20
    year old manuals. They must have missed the schematic, however, because it
    is not included. This may have been one of the models that had the
    schematic packaged with the unit, but it is not in the files for the OM nor
    the SM.

  10. Boiler_81

    Boiler_81 Guest

    Sorry, I did not really look at it. Many of the HK manuals do have the
    schematic included.
  11. Boiler_81

    Boiler_81 Guest

    HK did pull the main page. However, if you know you model number you can
    get the manual by replacing the hk3801 in the link I provided with the
    model you are looking for.

  12. H. W. Sams lists it as available as a photocopy. Their electronic
    index doesn't say if it was in one of the MHF series manuals as well.

    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
  13. Dan Street

    Dan Street Guest

    Five days ago I sent you an explanation of what is wrong with the unit and
    what I had already checked, as well as what I suspect is wrong, my
    qualifications and my need for a schematic.

    Since then, I have heard nothing from you.

    What kind of game are you playing, tvguy?

    Dan Street
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