Marantz CD75 no audio?

I'm not getting any sound out from the CD player. The transport seems to be working OK inasmuch as the display indicates a CD playing as normal but there is no audio out from the analogue phono sockets or the headphone socket. There also appears to be no digital output from the digital phono socket. I connected that to the digital input on a Sony MD recorder. No sound was heard although the MD recorder doesn't indicate an error code which it would do if digital input was selected and nothing was connected.

What should I do next?