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AF360FGZii post-mortem | by eight cent
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AF360FGZii post-mortem

What killed this flashgun was likely the zoom position sensor. It's a linear potentiometer, just a contact sliding over a resistive surface. Any imperfection (corrosion, incomplete contact, dead spot on resistor, etc) can cause the flash to be unable to tell when it has zoomed to its home position, causing the motor to keep spinning and grinding along the 2nd worm gear, which is the one that is allowed to "give" a little because of the hinged sled.

 

My flash made the grinding noise intermittently ever since it was new, and eventually got to the point where it was no longer usable because the motor kept spinning and it couldn't complete its power-on sequence.

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Taken on April 28, 2019