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Marantz model 5000 ground hum on line in, screeching on DIN

Discussion in 'Tape' started by Gertjan90, Nov 9, 2018 at 2:42 PM.

  1. Gertjan90

    Gertjan90 Member

    Messages:
    54
    Location:
    Belgium
    Hi guys,

    A week ago I pickup this neat looking little Marantz stack, with tuner and amp in excellent condition but the cassette deck not working.

    The model 5000 not only needed new belts, but I had to take the whole transport mechanism apart to clean off the harded old grease.
    Eventually I got everything working fine, but now this problem has popped up:

    There is an annoying hum from the speakers when I connect the deck to the amp with RCA connectors. Sounds a lot like ground hum. Both units have european plugs with ground so I can kind of see this..
    Playback and recording is good, no problems there.

    But: when I hook up the deck by the DIN connector, the hum is gone!
    Great! Playback works just fine, but when I try to record, all I get is this very high pitched screeching from both channels..
    The play/record switch has been very thouroughly cleaned btw.
    DIN to RCA cables just give me the ground hum again.

    So my question is twofold:

    - Is there any way to get rid of the ground hum other than to bypass the grounding on the plug?
    -What could be causing the high pitch noise ( and no signal) when I try to record over DIN?
    The DIN cable itself is an audio one, bought through the Philips audio forum a while ago.

    Any help is appreciated, thanks in advance.
     

     

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