Hi I bought my M1 plus one in 1993, it started distorting on some sounds so I brought it to a local music service place, He had fixed the problem but when I brought it home about 15 or so patches were not playing what they were supposed to be sounding like. I tried two different backups and it’s always the same patches and i know these backups are good since I’ve used them before. He said he had to solder wire across traces that were coming off the board. With the upgraded +1 from Invision I know they had to hot rod it and maybe he got something wrong.
What I need is the install instructions for the upgrade from Invision. Mine was a factory upgrade that was branded out of the box. Does anyone know where or have the instructions to install the upgrade or had a similar issue so we can confirm and possibly fix the issue I am having?
Thanks Kevin
I found this thread while deep-diving trying to find Invision Plus/One instructions myself. What I can say from my research is that the Plus/One installation involved cutting some traces on the main PCB, so it’s possible that your tech “repaired” these deliberately-broken traces and in the process messed up the Plus/One compatibility.
Unfortuantely, I don’t have much more information than that. It would be interesting to see pictures of your M1’s internals to see if there’s any clues for what the Plus/One installation process involved.
Crazy how there’s just no documentation about the Plus/One whatsoever - an occasional Reverb sale, a mention in an issue of SoundOnSound, some British YouTuber talking about it for twenty minutes without actually providing any actual information, and… that’s about it. Possibly the most obscure commercial upgrade of all time?
Unfortunately Kevin I don’t have an answer to your query but I do have a Plus 1 myself which has wiped itself out due to a dead battery. Could I trouble you if you could send me the stock sysex file to restore the sounds? I can’t seem to find it anywhere online and I don’t have the card to restore it - you’d be my Plus1 lifesaver if you have it! Thanks. Yuri.
Thanks so much for your offer to help Kelvin. Appreciate your generosity. I have managed to obtain the sysex, so I’m all good
Thanks again and wishing you the best in making music
You wouldn’t happen to have a photo of the motherboard KLM 1266 of your plus 1 ?
After I pull the back off I have 3 small yellow wires soldered onto pins on the back of the board and I don’t know if they were their before I took it to be serviced or it was done by the factory
As a matter of fact, I do! These are two photos I took when I first got it, and I see those 3 connecting wires. It’s never been sent in anywhere I believe (I got it used), so it should be the stock setup from the factory. I hope these are helpful.
Thanks
Well that rules out thinking they did this at the repair shop. They said they had to repair traces but I can’t find any evidence of repair or replacement.
Ok I found a YouTube video of someone upgrading their M1 to EX and they do the same thing as the Plus 1. He cut two traces and soldered on the 3 wires on the back. On the front he took the two wires from the upgraded card slot board under the main board and soldered the two wires onto a chip, pins 3 & 5.
I looked at mine and mine are on 3 & 4 but looked like 4 was previously on 5 since I saw residual solder on it. That wire had been previously disconnected when I opened it up after getting it back from being serviced.
You wouldn’t happen to have a photo of the front of the main board?
