Quote: What else can affect the ability to dectect AC or DC power? I had Ian replace the LVX04 chip at the empeg meet in Cincy two years ago. That didn't fix the problem, so Mark replaced the power jack for me a couple weeks ago. Still no dice. Empeg seems to work quite well other than this.
Did you ever get this sorted out?
We've got an MK2 unit which we replaced both those parts in also and it did not fix the problem either. In addition to not sensing AC properly, this one also has trouble starting up on occasion. The display light will turn on and flash a couple times, but the player doesn't boot and the display remains blank except for the heating wires. The only solution is to pull the power and reapply.
The problem doesn't seem to be any of the resistors in the path. Does anyone know if these problems could be caused by the power control PIC?
Stu
The thing to do next would be to check for continuity (and also for shorts to GND or +5V) between the power jack's sensor pin and the 74LVX04 chip (pin 9). Then do the same checks again between the 74LVX04 (pin 8) and the SA1100 CPU (pin 53). The fault pretty much has to be on one of those two traces, if the power jack and 74LVX04 themselves are okay.
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