Sorry to dig up an old thread, but did you ever manage to find the service manual/schematics for the transistor version of the GM751?

Did you ever fix your problem? I have a Sakata DPM-48 with the exact problem you described here.

Has there been any advancement with this in regard's to EMU's key scanners? I have an Emulator 3 with a bad R6500-1 that I'm searching for solutions to repair.

Yes, I've replaced those caps, and it did not fix my problem. I suggest you go for it! I would also recommend following the calibration procedure outlined in the service manual with special attention to the DAC voltage calibration.

I'm currently restoring a Polaris from the ground up. I received it with no voices working, all oscillator and filter chips removed. I've got it up and running again, but voice 1 and 6 are giving me massive detune problems. I've swapped the CEMs around between the working and non-working voices, as ...

I see the images talked about before, and now I don't know what to think... I have a Stix 305, and it only runs on +(-. Center positive will not work!

Well, it is a weird machine...

Old thread, but I'm posting in case anyone else googles their way here like I did looking for info on the PSU polarity for the Stix-305... As stated earlier in the thread INCORRECTLY. The polarity of the PSU is CENTER NEGATIVE! It is NOT -(+! The 305 is a little weird, and if you want to work with a...

unfortunately, i think any similar thread would be old news, thanks to ebay. so much for hunting.
i wonder if american fleamarkets are still worthwhile...

Checked out Rock Stop. They seem to have a few things, the most interesting being a roland JX-3P missing the programmer. Kinda sucks as they haven't got any speakers to test the gear on. that and it seems the guys there haven't a really good idea of what they've got. I asked one of the guys how thei...

maybe this thread is on its way out... however as i am in london this week, i decided to check these leads out. turnkey: the basement now is something called loopsomething-or-other, tables and mixers and such, or so the sales rep told me. i asked some kid working about the vintage gear they used to ...