The Eltron Company P310 - Manual (Page 83)

Step 6. Remove the two screws holding the Encoder Head Assembly. Then, while
feeding the associated cables through the Rear Plate cutout, Remove the Encoder
Head (see Figure 5-27).
980264-001 Rev. B
5-27
CHAPTER 5
Figure 5-26. Pressure Roller Rod Removal.
Figure 5-27. Encoder Head Fasteners.