Bump?

Is perhaps your replacement laser a "yintong-tidli-po.co" job?That may be the problem.

There are capacitor issues with this module,but they are surface mount jobbies,so need special kit and patience to replace.

Is it an early mark Ouverture?I don't recognise the pcb.

It may seem a daft question,but have you tried cleaning the laser lens.I was well "egged" tother day,when overlooking this!!!

Regards,

Nick

solderon29 wrote:

Is perhaps your replacement laser a "yintong-tidli-po.co" job?

Hi Nick! How did you guess?

Having replaced the laser which made absolutely no difference to it's performance, I figured the problem can't be the actual laser itself. Some CD's it works with, some it refuses to read. It doesn't matter if the CD's are original or CDR's but even after the laser change, the exact same CD's don't or do play. This led me to believe it must be a problem on the servo board.

Yes I did try cleaning the lens at the very beginning. I can only think that the power getting to the laser is weak or something.

Steve

You could email or message Die Bogener or Dillen

solderon29 wrote:

Is perhaps your replacement laser a "yintong-tidli-po.co" job?

Oh man, this really funny😁

joeyboygolf wrote:

You could email or message Die Bogener or Dillen

Will do Graham. Haven't seen Die Bogener around for ages!

If it is an smd cap issue as Nick suggested then I'm pretty much stuffed as I don't have the tools to replace those.

Nick, the PCB is from the suppliment to the service manual on this site which is a linear CD unit. The Ouvertures started out with a radial CD then changed to the linear unit which mine is. I think I've got that right!

The laser assembly in fact comprises the laser,it's control circuit,and both the radial and focus coils,in this mechanism.However,the capacitor issues on the main board are related to power supplies,so could be the culprits.I'll see if I can find the details.

Nick

There seem to have been several versions of the CDM12 mech Stonk.Certainly there is no "laser cap",or current to adjust as in earlier designs.With this version it's all carried out within the laser control chip,which is integral to the laser assembly,that you have replaced.It's interesting that the new laser is no better,but even if it's a "Arthur Daelee"(sorry,could'nt resist!) job it seems to work as well as the original.The caps that can cause probs are on the "b" side of the servo board,and have yellow labels marked 330uf and 100uf,c2000&20001.If the labels seem skewiff,and particularly if there appears to  be staining around the base,they are highly suspect.

Regards,

Nick

Nick, thanks very much! I'll pull it apart again and check it over to see if my nontech eyes can see anything suspicious. I'll take photos of both sides.

Much appreciated.🙂🤒