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Seduction C4S voltage readings

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Here are a few voltage readings from my troubled Seduction C4S board. Referring to #13 in the manual, which puts a colored circle beside each of the MJE 350 (rectangular black) transistors, I measured to the center pin (which connects to the wire to a Seduction terminal). Results: Black 139 VDC, Yellow 74.4 VDC, Blue 63.3 VDC, Red 77.8 VDC. I also measured each end of the four 237 ohms resistors, getting 141 VDC in each of the 8 measurements, and the two 75K ohms resistors, getting 138 VDC at the inside ends and 0 VDC at the ends closest to the end of the C4S board. I also tried to measure the wire going into a hole at the end of the C4S board, and got a scary snap and spark, but no damage done as far as I can tell, to multitester or C4S board.

Is there a circuit diagram for the C4S board? None with the manual, and I'm unsure what good one would do me, but maybe it would help.

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