On Wed, 5 Sep 2007 09:49:42 -0700, jon <jon@KENNEKE.COM> wrote:

>I can do that...but it might take me awhile to get to it (we're talking
>months here).

What, just to grab a working unit (if you have one...seems like you're
stuck like me, and that's why you started the whole project in the first
place...:-) and connect it to a 12VDC power supply and put a test
lamp?...:-)

>You can build a simple RPM simulator with a 555 timer chip and a handful
>of other parts.

Sure I could...:-)  but the whole point is to reduce amount of werk with
my limited time, and I was hoping no such signal is needed (someone said
here it wasn't needed but I wanted to verify so I won't beat around the
bush...).
And you can't be sure the 555 will create the right signal for this analog
computer (the hall sender doesn't crate square waves).

> It can even be variable.

Yeah, doing a wheelie with a 555 oscilator and the ISCU...

> Let me know if you want the pointer to a schematic.

Nah, that's OK, I can handle that...I simply don't want to introduce
another variable into the debug session.
BTW, I got me a few BD438's and will try them once I know what to expect.
BTW, did you see the pictures I posted? Do you still want me to send them
to you too?
Cheers.
TM
>
>Jon
>
>On Wed, 5 Sep 2007, T.M. wrote:
>
>> Volks, I repeat: I need the list's help to help me continue analyze the
>> circuit. As a bare minimum, I need:
>>
>> >8. Now I need the list's help: I need voltage measurements from a known
>> >good ISCU unit, to try and find where the problem hides. It's not very
>> >difficult - all you need to do is connect a low power 12V source (wal-
wart
>> >seems safer than 12V from a big battery) to pins 15 & 31 as described
>> >above, and tell me what you measure at all the other output pins.
Also, I
>> >need you to connect a low-power test light across the outputs (St1 and
>> >St2) and tell me if it lights or not (it should IMO) or even a small
>> >loudspeaker to know if it's a variable signal.
>> >** be very careful not to short any adjacent pins so as not to cause
>> >damage **
>>
>> This will also enable me to know I can continue analyzing on the bench
>> (without the engine RPM signal) and not inside the van which is much
less
>> convenient.
>> Any takers?...
>>