[dshepp806]

Well, if he's running a electronic repair facility (post #1), I would assume he'd have access to function /signal generators galore.....now, to just get the required data as to inputs (which are reasonably simple waveforms.

However, should the digital side of this be the problem,..you've a different a different "fish to fry", as to test gear (he probably has what he needs there, as well......

Curious to hear what you find out.

All equipment aside, there are several here who know this circuit very, very intimately,..not to mention having repaired MANY over MANY years. (THAT surely speeds things up!).

I can tell you from my experience with these (limited, relative to the Pros...BTW), is that I've seen/repaired 2 with solder fractures...in one other case, it was the ignition coil driver circuitry...I watched (and helped) another tech with problematic fuel injection (again relating to the drivers)....as I recall, one would want to make sure your injectors are good to go, insofar as load Z.

Check #1: power (period), all of it, too.

Bright WHITE lights and HIGH MAG (just as you stated!)

The rest have been great reads here at Pelican University of other people's experience.....(great shares!) I DO, however, love it when the discussion dips into the circuits!!!

As rick-l noted, there are (somewhat) "common" failures of this board and his recco' is dead on (M.O., too).

In closing, I think there already exists (somewhere in the cybersea) a list of these inputs (it's not some great "secret"), for the record.

I hope your find is easy (and NOT of heavy digital failure).

BEST!

Doyle