I decided I would update this here as it makes more sense.
Following from my original post http://www.assemblergames.com/forums...ding-100-issue there has been a minor update/sidestep.
I was lucky enough to get my hands on another "faulty" Sega CD2 model 4102A that has a JVC optima 6 laser fiitted. This unit I will call unit 2. Unit 2 was absolutely filthy and after a minor clean up and new laser worked flawlessly.
Unit 1 is the original "faulty" Sega CD2 that I had and worked strangely. If I played a game the music would lag, I used Sonic CD as an example and here is what I got
-No intro music
-when starting game music wouldn't start until 4 secs (off timer) into game
Unit 2 works ok.
Ok both unit 1 and 2 have NEW lasers fitted.
I took the laser sled from unit 1 and put into unit 2 and had the same lagging problems. I put the unit 2 sled into unit 1 and it worked flawlessly leading me to come to the conclusion the sled is the issue.
From my original post I believed that the previous owner of unit 1 had fiddled with the pots (on the sled board not the laser) and since there are 4 it would be a bitch to wing it to get back into it's original position. I eye-balled the position of sled 2 and tried to reflect on unit 1 sled, that didn't work as I suspected (having set-up circuit boards for battery chargers for when I was working as an electrical fitter).
Is it of the opinion that I could take it to an appliance repairer and give them both units so they could use their osciliscope equipment and take readings from unit 2's sled and try and match them onto unit 1's sled? I don't have an oscilliscope and wouldn't now what I am looking for in a "cd player" setting.
It would be a shame if I binned unit 1 as it seems so close to working properly. I could of course sell it as a faulty unit.....
Unfortunately I am having less and less time to spend on console repairs these days after having our first child.
Any help appreciated.