[TechAssist] JVC Model AV-20220 video switching problem, need schematic.

Hi, I need a schematic or a partial scan with the video switching 
circuitry. In tuner mode I get tuner audio but video from video 1 input. 
Video 1 mode is ok and video 2 mode is ok.
Thanks,
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Since 1972
Jim Myers
Telrad Electronics
Fort Wayne, Indiana

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