Very good information with clear drawings. Thanks!
Text excerpt from page 123 (click to view)
3-3-1. Switching Regulator and Line Filter Replacement (DMS-8800B/8400B)
3. Removing the harness (1) Loosen the four screws of the power bracket (2). (2) Remove the power bracket (2) in the direction of the allow in numerical (1 then 2) order, and hook it onto the screw inside the console. (3) Remove the seven screws, and remove the harness of the switching regulator. n Be sure not to drop the cover and short plate inside of the console or to lose the short plate.
Loosen these screws 1 Cover Power bracket
2
Harness
Loosen these screws
Short plate
Switching regulator
4. Removing the switching regulator and line filter Remove the two screws, and remove the switching regulator from the power bracket (2). n The switching power supply (24 V) and power supply attaching board at the very bottom of the DMS-8800J and 8400J differ in shape in the figure, but can be removed using the same procedure.
