DataOverwriteSecurity Unit Type M19 (D3BS-03) (MP 501/601 Only)
SM 2-135 D255/D256/M281/M282
2.22.4 INSTALLATION PROCEDURE
1. Turn OFF the main power, and then remove the power plug and cables that are
connected.
2. Open the rear upper cover [A].
3. Insert a flathead screwdriver into [A] to release the hook on the inside of the controller
cover [B].