The photo below shows the locations of the three thermopiles inside the machine with the fusing unit removed.

  1. Remove the rear cover. (Rear Cover)
  2. Open the front doors.
  3. Remove the fusing unit (x2).
  4. Remove the power switch cover (x4).
  5. Remove the ITB unit cover (x4).
  6. Disconnect the thermopile unit (x2).
  7. Rotate the levers up, disconnect the ITB cleaning unit, and then remove it (x1).
  8. At the back of the machine, to the left of the fusing motor [A] locate the screw holding the thermopile unit, and then remove it carefully to prevent it from falling into the machine (x1).
  9. At the front, disconnect the bracket [A] (x1).
  10. Pull the thermopile unit [B] forward until it is stopped by the frame of the ITB unit [C] on the right.
  11. Disconnect the ITB unit [A] (x2).
  12. Remove the lock plate [B] (x3).
  13. Pull the ITB out slightly. You do not need to remove it.
  14. Pull the thermopile unit out of the machine, and then set it on a flat, clean surface.
  15. On the front end of the unit, there are two thin seals, one at the top [A] and one at the bottom [B]

  16. Carefully, peel the top seal [A] and bottom seal [B] away from the plastic cover but do not detach them from the metal plate.

    • If new seals are available, the seals should be replaced.

  17. Disconnect the cover at the front [A] (x2).
  18. Disconnect the cover at the rear [B] (x3).
  19. To remove the cover, first slide it to the left [A] to disconnect the tab on the right, and then slide it to the right [B] to remove it.
  20. Disconnect the harnesses and the cover plate, and then turn the plate over (x3, x2).
  21. Remove a thermopile (x, x).

Re-installation

  1. At the front, make sure that the loose halves of the seals [A] are down so they will not be pinched by the cover when it is re-attached.
  2. Set the cover [B] on top of the unit.
  3. Fasten the cover at the front [A] and rear [B] (x5).

  4. Carefully, press the partially detached top seal [A] and bottom seal [B] onto the edge of the plastic cover.

    If new seals are available, you should replace the seals.


  5. The pins on the back of the thermopile unit [A] fit into the holes [B] on the post inside the machine.
  6. To set the unit, support the bottom of the unit [A] with your left hand as you slide it slowly into the machine.
  7. Using your right hand, align the hook and hole of the bracket [B] with the hole and boss on the machine [C]. This should align the pins at holes at the back.
  8. Slowly, push the unit into the machine until you feel the pins slide into the holes at the rear.
  9. At the back of the machine, make sure the unit and hole are aligned correctly, and then re-fasten the screw (x1).
  10. At the front, fasten the bracket (x1).