I have a Marantz CDR 310 that's not keeping the changes. Have already replaced CR2032 battery, but still same results.

Check if your CD is compatible for 16x writing speed. Try Ashampoo Burning Studio free version.

'Drop back?' Try different blank CD's.

No! since the process has begun it most be finalized through the Marantz CDR 300.

program it 2 record the track u want. or burn from a computer or other exit sorce

Hello
I have the same problem, recorder will not erase old tracks.
Have you found anything out?

You'll need an external mixer for that.

CDR error means the trouble is in the laser eye,maybe the eye is faulty already or dirty. If the laser eye is dirty,then you need to clean it with a cotton buds.Open the unit then wipe the laser eye tenderly with the cotton buds or buy a DVD / CD cleaner kit.Just click this link;
http://electronics.bizrate.com/search__SEARCH_GO--GO__SEARCH_GO.x--36__SEARCH_GO.y--16__keyword--dvd+lens+cleaner__search_box--1__sfsk--1.html

Hope its help:

Regards;
VOTIT

There is no battery in these units. I will check the service manual tonight and try to get yu a detailed response.

Dan

Try the following link.The manual will be automatically downloaded once the link is clicked.

click here for the manual of Marantz CDR

Good luck.please do rate my answer if accepted.Also feel free to post further comments.

have a look on ebay for a cheap working donor recorder as spares are very expensive and very hard to get hold of.
i'm guessing your recorder either doesn't read discs, or it won't eject? which is very common and means either the servo board is faulty or the laser.

The following recorders i know off hand for a donor mechanism are:

MARANTZ DR-6050
PHILIPS CDR-775
PHILIPS CDR-770

if it proves to be just a faulty laser, all 3 of the above have the same laser unit.
if it proves to be a faulty servo board, all 3 have the same servo boards except if you fit one out of a philips model it will show 'PHILIPS CD RECORDER' on the display at power up but will still work nontheless.
obviously if a marantz is found it will show 'MARANTZ CD RECORDER' as normal.

hope this helps.