I can do that...but it might take me awhile to get to it (we're talking months here). You can build a simple RPM simulator with a 555 timer chip and a handful of other parts. It can even be variable. Let me know if you want the pointer to a schematic. 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?... > |
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