3.1.9 Removing the display board / switch board (See Fig.18 to 20) � Prior to performing the following procedure, remove the front panel assembly. (1) Pull out the VOLUME knob on the front panel. (2) Remove the six screws M attaching the switch board. Then, open the switch board in the direction of arrow, and remove the operation button. (3) Remove the ten screws N attaching the Display board and the two screws P of the LCD holder.