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You could try a CD lens cleaning disc which will clean any dust off the laser lens. But it is possible the laser power can be low if it is an old player. this will stop the discs being read fence the fault No CD as it cant see the disc. This will mean either a new laser assembly or complete CD deck. Try the cleaning disc first and if that does not work take it to a service centre or just use it as a radio cassette in the garage.
Failure of this laser is quite common giving a no disc message in the HiFi's display. A defective laser can also be responsible for an intermittent no disc message and general playability problems with CD discs. Part number Optima 7 / 7B Laser Assembly
It could be many things but if you put the disc in and you can hear the noise it makes while its scanning the disc then its probably the laser is mis-aligned. If you cannot hear any noise at all and it comes up with error after a while then it could be the entire laser unit needs replacing. Good luck.
Silmilar problem on a MX-D501T At times the unit fails to recognise the music CD in the tray, or
recognises its presence and shows tracks & time play on screen but
doesn't initiate playing. The fault is erratic. Pushing 'play' on the
remote doesn't initiate either. Is this a faulty head or 'dry joints' somwhere?
Have it first cleaned by a cd disc cleaner or if you are familiar with cleaning the lens manually im sure that will work...or try inserting an original cd's,if it works with that find the solution to the settings of your device...
M-Error is a mechanical error and could have a multitude of causes.
just went through it with a TAD-5160 unit where it was a small slip gear moving a tin lever to ingage the transport sled to insert or eject the disk from and to the carusel. You may have to take the unit apart and asess the problem.