Got a kp7220 that works great, but seems to be a little out of focus. Is this as good as these things got in 1982.

Got a kp7220 that works great, but seems to be a little out of focus. Is this as good as these things got in 1982. Or are there more adjustments I can make other than the ones on the back? Do I need parts? Don't know much about these things. But, I do know the kids absolutely love it. please help!

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