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If the machine is out of mechanical alignment, the VCR blanks the picture rather than show it with poor quality. Those can be somewhat challenging to align, since you can't even see the picture until you're fairly close to optimum. You might try adjusting the 2 guide posts a little at a time, and seeing if the picture pops in. Or, you might have bad play heads if the machine has seen heavy use. As a last resort, you might try a dry type head cleaner, which actually laps off the top layer of the heads - but no more than 10 or 20 seconds using this type of cleaner.
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