Hi Daniel,
Now let me see... So you say you are getting just DC on TP5? Have you got the scope in set for AC input? ;-) I doubt if the material type of the components you mentioned are you problem, but we'll cover that a bit later. First, you should note whether the MG LED is on, off or pulsing. However, in your case did we manage to get that blue wire back in place? Second we need to measure the astable comprising IC16 and IC21 and see if it is in oscillation. You know about oscillators, right? You present the output as positive feedback to the input with a gain greater than 1 and the whole thing starts to resonate. Only this circuit is current controlled by pin 16 of IC21. The output of the mux (IC19), the buffer IC13 at pin 7 and the long tail pair transistor are responsible for altering the current and changing the speed of the MG. That is a very loose description of how it works but it should give you some pointers. You should hook up your scope to pin 12 of IC21, IC16 pin 7 and the drain of FET Q1 and see what you have. You should have some nice slow running triangle waves if running.
Let us know,
Andy
--- In PolySix@yahoogroups.com, "Daniel A" <apophis93@...> wrote:
>
> Ok,
>
> Still at it with no solution yet on why my MG is working.
>
> I have a question in regards to the part list vs original board. R16, 39, 46 and 48 on the part list call for metal film. The two old boards that I have are a 367 and a 367A have carbon film at those locations. Is there a good reason why they should be changed to metal film for the new 367A's? I installed carbon film at these locations but could swap out. I have gone over every Res and Cap to check Value Polarity and continuity at this point and save those listed above and the 5 1/2 watt metal film Rs everything is to spec.
>
> Another is what are all the IC's that have a direct influence on the MG? My guess is these:IC1, 2, 20, 21 and 32. How about IC 13-16?
>
> Thanks!
> Daniel