Question about Sony UVW-1800P VCR

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Is the top and end sensor supposed to be off in servo check mode

Am running checks to hopefully correct no video output after a wrong tape got stuck in unit. Am in servo check mode and it's doing top/end sensor check and both sensors show being off, is this correct? and i presently have a tape in unit,
thank you for any help

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  • carlv Nov 10, 2008

    Okay thanks appreciate that. I removed the tape and both sensor's remain off

  • carlv Nov 10, 2008

    no voltage at ir led's

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  • Master
  • 10,594 Answers

If the tape is inside, both sensor should be OFF because both are photo diodes and will ON when receive Light.
Tape inside covers both sensors, so no light, no ON signal.

Posted on Nov 10, 2008

  • Shahid Electronics
    Shahid Electronics Nov 10, 2008

    No tape inside and sensors OFF, then check Infra Red LED mounted at center of both sensor to pass light when needed, this seems not working. Check volts on IR LED.




  • Shahid Electronics
    Shahid Electronics Nov 10, 2008

    I think IR diode supply will turn on when there is a tape inside the unit.
    Do you have dummy tape to check? Dummy tape is used to test loading and unloading of mechanism.



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with no tape in the unit, the tape top/end sensors will be "off".

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