Focus Problem on new OHP

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I recently upgraded my 3M 9700 to a 3M 9800 and I am getting focus problems. I can get the center of the screen to focus but the corners are out of focus and vice versa. I tried switching the lens and mirror arm with the 3M 9700's arm and it focuses fine. Therefore, I suspect it has to be something due to my lens or mirror.

Any suggestions?
 
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