Brother HL-2700CN Service Manual page 196

Sequence of Assembling
1) Install the transfer unit PU into the printer.
2) Secure the transfer unit PU with the knob screw (2 pieces).
3) Close the paper exit unit.
4) After the replacement of the transfer unit, press the "GO" and "+" buttons
together to reset parts life. (With "PARTS RESET LIFE" menu, you can reset
parts life. This is not open to other than the service personnel in principal. You
may let users know as necessary.) In details, please refer to
"RESET PARTS LIFE".
<Cautions>
1) This work is one of periodic replacement jobs, but cannot be the customer. This
should be implemented upon request of customer or at periodic maintenance.
2) After the replacement, confirm the improvement of print quality failure by test
print.
Fig.6-25
VI-25
Transfer unit PU
Paper exit unit
Appendix 6.2
Knob screws