The Panasonic RX-D12 have on display error code U01 and doesn't work in any option.
I've found transistor Q308 but I haven't service documentation therefore apply to you If you could help me to identify type of this transistor (PNP or NPN and parameters).
Thank you very much for posting the ref of transistor and to propose the service manual.My Email address is:firstname.lastname@example.orgIt replaces the one I gave earlier.I would really enjoy getting the tech. manual.
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If it has been a while the laser lens is probably dirty and needs cleaning, you can buy a disc cleaning kit and load it in the machine. The other option is to dis-assemble the unit and use a Q-Tip and rubbing alcohol being careful to clean it gently. If this fails a new assembly will be needed but this would not be cost effective.
there is a flat connects the top panel which has all the controls with the other circutes in the stereo...
so you have to open it and care for the cd unit it damage easily then check the flat for loseness or cuts
it happened to me also and that works perfectly
Here is the link to the user manual if you need it;
although of course it doesn't list that error code and panasonic no longer support the model on their site except for the user manual. If you don't mind paying $19.50, then these guys have the service manual available which almost certainly will list the error codes and their solutions;
Sorry I had no luck finding that one for free.
My guess is that the lens needs cleaning, and that the error code simply means "bad disc" or something similar.
Best way to clean the lens is with a cotton bud/ Q-Tip moistened (not wet) with gin - nothing else works as well or as safely. This should be easy to do as you have direct access to the lens, just be gentle.
If you get no luck from that then the best i can suggest is to contact panasonic direct;
and see if they can tell you what the code means, if they do, and you need help solving the problem, please ask again.
Good luck, I hope this helps