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Kenwood KR-9050

Discussion in 'Electronic Repair' started by [email protected], Mar 6, 2007.

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  1. Guest

    Speaker relays not turning on. No DC offset from the outputs. Have no
    schematic. Anyone know which transistor(s) control these relays?

    Thanks
    Cindy
    Pearsons Electronics
    Spokane, WA.
     
  2. David Farber

    David Farber Guest

    Hi Cindy,

    The positive side of the speaker relay is fed through bridge diode D9, then
    to R52. The voltage coming out of D9 is not marked on the schematic. The
    other side, the actual switching side of the relay goes through quite the
    mess of circuitry. But I'm going to suggest checking the power switch.
    There's an extra pole on the switch that connects pins 6 and 7 of the tuner
    board which in turn goes to pin 8 of the tuner board. Then it connects the
    to the other side of the protection relay. My schematic is on microfiche and
    difficult to decipher but if memory serves me correctly, those intermittent
    power switches would shut off the relay and waste hours of troubleshooting
    time.

    Hope this helps. If it doesn't, can you please report what voltage is on the
    relay?
     
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