To prevent electrical shock caused by residual voltage, never touch the areas outlined in red on the front [A] and back side [B] of the board.

Residual charge of about 100 to 400V remains in the AC circuits on the PSU board for several months, even after the machine has been turned off and disconnected from the power source, or after the board has been removed from the machine.

The procedure to discharge residual voltage from the boards by unplugging the power cord from the power source and pressing the main power switch works only for the DC circuits. Residual charge remains in the AC circuits.

  • A bracket is not attached to a replacement for PSU-B. The board is removed directly from the machine.

  1. Remove the controller box cover (Removing the Controller Box Cover, Inner Cover)
  2. PSU-B is the upper board.
  3. Disconnect the boards (x7,x8)
  4. Remove the board.