Fix Fault Technics

I did buy a Technics mini disc player recorder from E BAY but it rejects the disc every time I put a disc in to the machine , how can I fix this

My Technics MD player / recorder will not recognise some of my home recorded MD,s and shows "DISC ERROR" Recordings were made on the Technics equipment and until recently MD,s played OK.The same MD,s ... more

I have a Technics minidisc deck SJ-HD501 player and last night it recorded fine today it just comes up blank disc or disc error can any help me