Hi.

With reference to the attached schematic, I would proceed by first connecting the stalk and measuring the voltage at pin 2 of the PIC, IC4, as the controls were manipulated. If you don't get any voltage there, or it doesn't change, check the output of IC3 pin 1, the LM258. Also check it actually IS a 258 smile

If there still isn't anything, check the input on pin 3 of IC3. If there's STILL nothing, your stalk or wiring is bad.

If you get a voltage at IC4 pin 2 that looks reasonable, it's possible that the PIC is faulty or damaged. D2 should protect the input from spikes, but it's not infallible. If this turns out to be the case let me know and I can swap it for another one.

Pca


Attachments
Tuner1A.pdf (910 downloads)
Description: PCATS tuner V1.0A schematic


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