Originally Posted by
guitar9199
+1 on this.
I had an issue with a Sharp "Locking Up" where the customer would have to reboot the device, so after troubleshooting we thought the main controller was shot. Swapped it for a different Sharp copier as a loaner, and within 2 days it started doing the exact same thing!!
Brought a line tester, and the AC voltage would fluctuate to as high as 120 VAC, but would drop down as low as 113 VAC. Also saw a 6-8% drop in current under a 15 amp load, and 5% under 20 amp.
Surge protectors are great to help protect against spikes...but they don't do diddly-squat for "Sags".
Good luck.
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