On Mon, 3 Sep 2007 02:00:52 -0400, Tinkerman007 <tinkerman007@YAHOO.COM>
wrote:

>Then I also took many close-up pictures so I could later continue to
>analyze the circuit and even decode the circuit diagram...

>This is only the beginning, because I can provide my photos to the list
>for a joint effort of reverse engineering project to get the schematic so
>we can easily repair these expensive units (remember, 350$...ouch!).

Folks, when I say photos I mean REAL CLOSE-UP PHOTOS where you can zoom
down to the level of a thin track or read a miniature resistor's value, on
both sides of both boards...:-) at the convenience of your PC, not inside
the van at a dark night...and with the power of about 1000 list members,
surely there would be a few knowledgeable ones that could help too.

But I really don't think we need to completely reverse engineer the
circuit - more like analyze it's outputs as well as some internal signals
during normal operation so we could quickly analyze if it's working OK, as
well as some of the external interface circuitry that can get damaged and
need replacement (such as that famous power transistor driving the ICV).
Anyone have a digital storage scope withing access?...:-)
Personally, I have a DVM and frequency counter, and maybe could use an
analog audio recorder as a crude signal analysis device by viewing the
waveform on my PC (BTDT...).

But first, I need a place to put the files. Maybe on Gerry.vanagon.com?

And like I said, I need to know first off if the ICV should buzz with
ignition ON but the motor NOT running (i.e. no ignition pulses coming in),
because then I could check the ISCU on my test bench with all the meters I
want, and not be limited to in-van testing.
Any takers?