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| + | [title] Single beep - GFI test failure notes |
|---|---|
| + | [* black] A single-beep GFI test failure is most often a transient failure. Tracking down the actual failure has been elusive, but may be related to low line voltage (208v instead of 240v) or an issue with the -2.5v (negative 2.5v) regulator in the GFI circuit. |
| + | [* black] Most often this will clear itself if the temperature or ... or the planet alignment changes. Simply unplug the box for 2 seconds, plug it in again, and it will re-test. |
| + | [* black] More rarely, the 0.1uF (105) yellow tantalum capacitor attached to the large -2.5v regulator on the board needs to be replaced with a 1uF (106) capacitor. Observing the voltage on a scope, you may find a sawtooth voltage output there. That's the telltale sign of needing a 1uF capacitor instead of 0.1uF. |
| + | [* black] You may find the GFI test resistors have cracked - put some solder on the edge of each one and see if they break in half when the solder is melted. Simply replace with a matching value resistor. |