Tenma 72-870 NTSC Video Pattern Generator video shifted to right.

We have one of these pattern generators (see link below) that has suddenly shifted the video from the composite output to the right about 10% of the screen size. The failure occurred rather suddenly and not over a period of time. I figure a timing problem, but there is no service info available from the manufacturer, nor was I able to locate any info using Google. The manufacturer did not even deign to respond to my inquiry. Can anyone help, or possibly supply me with a schematic?

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