Brother HL-1850 Service Manual page 164

(2) Remove the two bind B M4x10 Taptite screws, one from the high-voltage PS PCB ASSY
and the other from the engine PCB ASSY.
(3) Shift the engine PCB ASSY slightly and remove the central connector, which connects the
engine PCB ASSY, and the high-voltage PS PCB ASSY.
(4) Remove the high-voltage PS PCB ASSY first by lifting up straight upward.
(5) Disconnect the 12 (twelve) connectors from the engine PCB to remove the engine PCB
ASSY.
Engine PCB ASSY
Main frame
NOTE:
When re-assembling the the engine PCB ASSY and the high-voltage PS PCB ASSY, fit the
engine PCB ASSY on the frame, then connect the both PCB ASSY with each other by the
central connector. And then fit the high-voltage PS PCB ASSY straight downward onto the
frame. Fix the both PCB ASSY with the two screws.
!
CAUTION:
•
Even if you want to remove only one of either the engine and high-voltage power supply
PCBs, ensure you remove all screws securing both PCBs and disconnect the central
connector while lifting both of them up. Failure to do so may damage the PCBs.
•
When re-assembling the engine PCB, ensure it is aligned with the positioning boss first.
Be careful the main motor harness is not caught between the engine PCB and the frame.
•
When re-assembling the engine PCB or high-voltage PS PCB, ensure the central
connector is connected correctly.
CHAPTER 4 DISASSEMBLY AND RE-ASSEMBLY
Screws
High-voltage PS PCB ASSY
Fig. 4-87
4-57