Disklavier

hello

Hello everyone. For several days, my piano does not work with my silent. The message "pwm over" is written on the control box. what happens is simple, the disklavier reads the floppy disk because I see the seconds scrolled but no sound comes out, then it hangs with this message. I would like your help

thank you

Hello　stewenn 

 System power is normal but drive power is dead. 
Did something happen before it broke?
I guess the cause is one of the following.

The power supply unit fuse has blow.
The PEDAL solenoid thermo or keyboard solenoid's thermo is dead. 
The mute drive circuit is dead. 
The transistor array of the keyboard drive circuit is dead.
 It is difficult to pursue the cause if you are not an engineer.

Please check the error history in the test mode.