If "Mech. Er." appears in the mini system display, the unit has, in some way jammed (1) or more CD's in the CD tray. The loading mechanism has locked onto the CD or CD tray table. Unfortunately, if this is the case, you will need to consult an authorized Yamaha service center for assistance. Please contact your local authorized Yamaha service center by dialing (800) 492-6242, menu selection (1), and then (4) for service. Your local service center will need to do an evaluation on your unit to see if there are any operational problems.
Do you need an additional help?