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1981 Delco radio repair

Discussion in 'Electronic Repair' started by billccm, May 23, 2007.

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  1. billccm

    billccm Guest

    Hello:
    A Delco radio from a 1981 Corvette came across my work bench. It must
    be the top of the line for it's time; it is electronic tuned, and auto
    reverse cassette. Unfortunately, all the stickers for model and serial
    numbers have fallen off the radio's case.
    The complaint is hiss, but no tuning, no display, no music.
    I applied 12Vdc, and the complaint is correct. The display is dark,
    and only a small hiss in the speakers.
    I actually repaired Delco car radios back in the late 1970s when I
    worked for a local service shop while in high school. I have forgotten
    much about these, but remember that for the most part, Delco radios
    were reliable, and generally simple to fix.
    With this radio, I am not sure where to start. A schematic wouyld be
    helpful, but I do not havethe model, and do not know where to get
    schematics.
    Any advice, and assisatnce is appreciated.
    Thanks,
    Bill
     
  2. Gary Tait

    Gary Tait Guest

    Check the 5V regulator on the ETR board. Also, you need to feed it
    continuous 12V on the separate two connector lead, on the orange wire.
     
  3. Tim

    Tim Guest

    It may be one of those "Corvette Special" radios as well. I believe
    quite a few years of 'vettes had those in them. I would look at the
    power supply for the front display and tuner. It is probably proprietary
    logic, but it may still a simple defect.

    - Tim -
     
  4. Art

    Art Guest

    Look for a DC-DC inverter circuit that has failed. If memory serves me the
    DC-DC developed supply voltages both for the tuning and display circuitry.
     
  5. Gary Tait

    Gary Tait Guest

    Tuning comes right from 5V or 12V. VFD displays would have a DC-DC
    convertor, and I don't think they had them back then. It wasn't till
    1985/6/7 or so when they went to VFD for their premium stereos, I think.
    Before that, they used LED.
     
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