In this episode Shahriar repairs his Faxitron MX-20 digital x-ray system. Although the machine has been producing beautiful images for years, recently it has been outputting out-of-focus images intermittently.
The principle of x-ray focusing and beam-spot generation is presented along with potential electronic methods of achieving focus. The teardown of the unit reveals the main x-ray tube controller PCB which houses the focus control high-voltage modules. Since the problem is intermittent, a reed switch is also suspected. The high-voltage module is measured and appears fully functional. Replacing the reed switch corrects the out-of-focus images. Several x-ray images showcases the sharpness of the unit after the repair.

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