there are two options to answer my question.
option 1: find service manual
what I need is a diagramm specifying the internals of my Pioneer DVD-ROM-Drive, something like a manual for service-technicians in PDF or other printable format.
Where can I get one?; who can send me one?; Can I get it for free or do I have to buy it?; How much will it be?
option 2: tell me how to repair
I have one of these PC-housings with a front door. When I was copying a CD-ROM I closed the door, because I did not want the crawling kid to interact with the drives while they did their work.
I forgot that after copying NERO ejects the original CD-ROM without prior warning. There I had the slot-in-mechanism trying to eject the CD-ROM into the door of the housing.
I then very carefully pulled down the door, pushed the CD-ROM slightly into the DVD-slot and fully opened the door.
Since then the drive does not pull in CD-ROMs or DVDs by itself but makes a noise that sounds like
and then spills out the medium.
Pushing the media in by hand with a special move I can trick the mechanism and make it pull in CD-ROMs and DVDs. But then ít will only log in DVDs not CD-ROMs!
So I can watch movies on the PC, but not read CD-ROMs. I wonder, how the drive disinguishs between DVDs and CD-ROMs (Are DVDs heavier?).
I opened the drive (guarantee-time is over) to see, whether there might be any obvious reason for the behaviour, and there was a little transparent plastic part falling out. I could not determine where it came from.
I someone is interested in helping me I can try to "photograph" the interior of the drive and the piece of plasic with my scanner and put the pictures on the web.