McIntosh MCD500 main display problem

Hi,
My McIntosh MCD500 SACD main display always doesn't show anything and CD function bottons don't work at the same time but the smaller display to show volume level is normal. After pushing stanby botton several times, the main display and CD function bottons become normal.
Does anyone know what the problem is?
 
Hello!
Unfortunately, the problem could not be fixed. The essence of it is that the disk drive board does not start. But it was not possible to find out how to fix the problem. Replacing worn capacitors in the power supply circuits did not give results.