Brother HL-3040CN Service Manual page 313

(3) Disconnect the Flat cable (CN7) of the High-voltage power supply PCB ASSY from the
HVPS control PCB ASSY.
Note:
- After disconnecting the flat cable(s), check that each cable is not damaged at its end
or short-circuited.
- When connecting the flat cable(s), do not insert it at an angle. After insertion, check
that the cable is not at an angle.
(4) Remove the two Spacer from the High-voltage power supply PCB ASSY.
Spacer
CN7
HVPS control PCB ASSY
Fig. 5-184
Fig. 5-185
5-139
Flat cable
High-voltage power supply PCb ASSY
Side frame R
High-voltage power
supply PCB ASSY
Confidential