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Discussion in 'Electronic Repair' started by Vince, May 15, 2009.

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  1. Vince

    Vince Guest

    I'm working on a CTC 187 chassis, without the yoke hooked up, I turn it on
    and the 140 volts through the flyback to the horozontal output stays up
    witch is normal, then hook up the yoke, and turn it on it drops down to
    about 70 volts and very little high voltage,. after a little while the
    raster will come on about half the screen and the sound won't come on until
    I take the CRT board off the picture tube. The picture tube is good, I
    hooked another chassis to it and it worked fine, what other than the
    flyback could cause this?
    Thank you for any advice you can give me.
  2. mark

    mark Guest

    Either substitute the yoke which you probably don't have another or
    how about getting the yoke checked if you have an inductance meter and a
    schematic which would tell you the inductances of the horizontal and
    vertical windings.
  3. Franc Zabkar

    Franc Zabkar Guest

    I don't know about your chassis, but I have seen other sets where an
    open B+ capacitor causes the B+ rail to drop under load. You may want
    to check what the other secondary rails are doing. An open bulk cap on
    the primary side may also produce such a symptom, although in this
    case I would think that the secondary rails would also drop in similar

    - Franc Zabkar
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