Hi Arron...
Don't ruin what might be a perfectly good CMI28 or CMI31. The world's short of 'em as it is!
Also, CMI28 is not your problem, from your description of things.
If you MUST replace that CMI28 pin (which pin is it?) why not just get another PCB mount ribbon cable socket from your local electronics store, or better yet, simply pull a single pin from another ribbon connector socket. They are 'L' shaped pins. You can then cut a slot in the original ribbon connector and remove what's left of the old broken pin. Just that pin. No sense in toasting the whole board.
The other thing to do is check which pin it is. The CMI 28 ribbon is fairly low priority as CMI ribbons go. Also not every pin is critical in that ribbon. They are MIDI/SMTE/SYNC in and out, and are absolutely not required to boot up a series III.
Absolutely certain the symptoms you're seeing aren't due to something wrong with the CMI28 or its connector. Like Peter says, sounds much more like the channel support card. And of that, I'd say give it a clean and make sure the critical signals are coming off it. It's not a very complex card, but it's very important as all the waveform buss timing and CC timing comes from this card.
The other general advice is to double-check the slot-keys in your backplane. They occasionally fall out and cause cards to mis-seat. It absolutely causes boot failures and blown fuses.
> Im not sure this will be successful though, as the double sided board might not survive the
> removal process.
You're probably right. And it won't fix your symptoms at all.
Good luck,
Joe
On Thu, Jul 8, 2010 at 3:24 AM, arroncx <aclague@synapse-consulting.com> wrote:
Thanks for the advice Peter : really appreciate it.
Im beginning to think that the channel support card is badly broken : there was a fair bit of corrosion on the solder, and it looks in a bad way. :(
Also, I found that a pin had broken off inside CMI 28 card, and so Im going to try and replace the ribbon cable terminator with one I have removed from an old CMI31 card. Im not sure this will be successful though, as the double sided board might not survive the removal process.
Anyway : enjoy your holiday, and l'll let you know how i get on :)
And thanks again for the advice .
Best wishes Arron
--- In Fairlight-CMI@yahoogroups.com, "horiprod" wrote:
>
> Hi Arron.
>
> The CMI does a real basic hardware check of channel cards through the motherboard. However, all the timing clocks for the channels come from the aptly named channel support card, CMI 32. If you can't substitute a known good replacement, check the master clock on this, and then the two delay chips which provide the timing signals. Sorry can't remember what they're called - still on holiday, and spent the evening in a canal side bar in East London drinking the finest wines known to humanity.....
>
> Regards,
>
> Peter Wielk
>
>
>
> --- In Fairlight-CMI@yahoogroups.com, "arroncx" wrote:
> >
> > HI there :
> >
> > I feel im getting closer, but still no full boot.
> >
> > On the startup screen, I always get "Cmi Channel Card Detected : None Detected"
> >
> > Does any one know how this detection proccess works , and where to start looking for the problem ? All the Cmi Cards have flashing lights on them, so they are at least getting power.
> >
> > Thanks,
> >
> > Arron
> >
>