The lazer unit won't raise up.

It sounds like buy your details, That i will compliment you on, Are to the point not like some other people asking questions on hear, That the lazer is shot, End not reading the info off of the disc any more, It is verry costly to have it repaired, Just look for a different one, I have got good used ones for friends of mine for $7 to $30 at the most, From thrift stores or privately, Hope this helps you out.

someone has to open the unit to see if something (a disc or something else) is jammed--mechanism could be jammed or out of alignment.

Often if the disc is jammed it can gently be moved to let the unit work again.

You have to take case/lid off and see what is jamming drawer. Its binding on something and putting a disc in when 3/4 open isn't going to fix it

Hi there, had a similar problem.
This unit is easy to open. the four screws on the sides and two i think on the back. When it is open you will have access to the discs in the machine. the last disc will probably be jammed between the facia and the caddy and will be impeding the carousel mechanism, once removed you should check the functions starting with eject, and again to cycle, load disc position 1 insert disc and check. this player i think rotated the disc on loading to a set position, would have to open one to check. hopefully the carousel is not out of sync and all is well.

get yourself a lazer cleaner and run that, it should work after that.

Unit is not recognizing disk because of defective or dusty lazer pickup. It may also have defective disk motor. Have serviced

how old is the player, it sounds like the lazer has gone down if it reads cds and not dvds

Make sure the disc is spinning. This might sound crazy but try turning the whole player upside down and see if it plays.

Try this link. It offers resistor changes which are designed to fix your problem of inability to play any CD R. on that model Nakamichi. jacknz0 http://home.cogeco.ca/~niteowl/Nak_MF51.jpg

check to see if tray is out of alignmnet ..also check to see if 5 or 7 pin flat ribbon cable form servo drive board to tray got dislodged from connector or is bent,cut etc...