Does it have a 7 pin DIN plug? The 3404 should work. If it is playing, does it stop when you press the stand by on the remote?
And is your remote OK, the BM 2400 is known for bad caps in the remote receiver.
Location: Mexico city
Printing machine technician
Restored various 1960-70 items
Rock and Roll music
Collecting Vinyl
Restored Jukebox Wurlitzer 1050