A heat sink or condenser can retain a considerable electrical charge after the machine has been turned off and remained idle for hours and even days.

  • Warnings are printed on the front of the boards [A] near components that can retain residual charge.
  • Some of the soldered contacts on the backs of the boards [B] are extremely sharp and can cut or puncture your fingers, as well as cause an electric shock.

  • To avoid electrical shocks, handle boards by their edges and never touch any component on the board with your bare hand or a tool, especially one of the heat sinks or capacitors.
  • Always keep the rear covers on the machine. Never leave the covers off during machine testing, or while the machine is idle during servicing.


  • Turn the machine off and allow it to cool for at least 10 min. before you remove the AC drive board.
  • Avoid touching the heat shield of the board.
  • The tube fuses on the board are the ceramic type. You cannot visually inspect a fuse to determine if it has blown.

 

  1. Remove the rear cover
  2. The AC drive board extends from rear to front along the bottom left side of the machine.
  3. At the lower left corner, disconnect:
    [A] Harnesses (x2)
    [B] Noise filter (x2)
  4. At the bottom, disconnect harnesses [A] (x1,x3).

  5. Disconnect the back of the drive board [B] (x8).

    • Be sure to note which connectors are connected and which are not. The anti-condensation heaters may or may not be connected, depending on ambient temperature and humidity at the work site.

  6. Disconnect the back of the drive board (x2).
  7. At the front, pull out the paper trays.
  8. Remove the cover (x2).
  9. Disconnect the front end of the drive board [A] (x2).
  10. Remove the AC drive board [B].
  11. Disconnect the drive board shield cover (x8).
  12. Remove the cover [A].
  13. Disconnect the top of the cover at [B] (x2).
  14. Disconnect the top and bottom of the cover at [A] and [B] (x2).
  15. Remove the cover.
  16. Disconnect the board (x10,x6).
  17. Remove the board. The rated voltage of the board is marked in the upper right corner.