1# I hear clicking all the time and my music comes and goes. Disconnect the bundle of black wires and the clicking should go away. Then hook them up one at a time until the clicking comes back. Leave that one disconnected and hook all the others up. Play music and go to each speaker and push the DOOR switch. If the music does not mute that is the bad speaker.
2# My display is not working. Check the transformer for the proper voltage. See transformer table below, Each model is listed by the transformer model.
3# My doorbell does not work. Take the master out of the wall. Then locate the chime terminals and disconnect the orange and yellow wires from the terminals. Short the terminals together if the chime rings the problem is in the wires or the front door button.
4# I have a MCD "Single Disk Player". When I put a disk in it is says "CD ERROR". This could be a dirty Laser Lens. Have the lens cleaned by a technician. The CD cleaners does not alway work. If cleaning does not work the laser head could be out. In which case it is not repairable. The laser head is no longer available.