CDM12.1/05 versus CDM12.1/15 ... Does anyone know the differences?

Hi everyone, i have a little problem with a 90s Philips system (FW41/21), the CD system don't read and tried to change the CD system (Original part CDM12.1/05) with a new replacement CDM12.1/15 but don't work and the CD doesn't read (Screen show "No Disc").

Someone do know what are the differences between these systems ?... or where i can find information about ?.

Thanks a lot.
 
as far as I know they are interchangeable. But you need to adjust the (very small !!) potentiometer on the back of the laserunit in order to let it read the CD. It is a hell of a job to get it right but if you do this meticulously it will work. Best to drill a hole in the back of the casing (just right after the potentioneter) and use a small screwdriver to adjust it bit by bit. I have done this recently in a Meridian CD player (with a 12.4 unit) and that went well.
 
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