FANUC A20B-1005-0110 DPD/MDI Video Switcher PCB

Some FANUC boards are easy to define by where they sit in the machine: power, motion, memory, I/O.

The A20B-1005-0110 is different. Public listings identify it as a DPD/MDI Video Switcher PCB, part of the A20B-1005 series.

That clearly places it in the video or display-signal side of the control hardware, where the main requirement is correct signal-path matching rather than power-stage substitution.

For control systems that still rely on the original FANUC display architecture, a video switcher board is usually selected by exact board number and installed interface arrangement. The part name itself strongly suggests a switching role between DPD and MDI display-related sections, so this is the kind of board that should be matched by application context, not just by connector shape or board size. 

Technical Snapshot

Actual Applications

The A20B-2001-0850 is used in FANUC R-J2 Mate control systems where a 2-slot backplane PCB is required to support the controller board layout. In practical terms, it is typically applied during control cabinet repair, backplane replacement, or restoration of an existing R-J2 Mate controller when the original rack structure must remain unchanged.

This board is especially relevant in applications where the original control needs to keep the same board interconnection format, such as robot controller repair, legacy FANUC control refurbishment, and service work on installed R-J2 Mate systems.

Because it is a backplane rather than a logic processor board, its real-world value is highest when the goal is to preserve slot alignment and board-to-board connectivity inside the controller. 

FAQ

Q1. What type of board is the A20B-1005-0110?
It is a DPD/MDI Video Switcher PCB. Public product listings use that exact description, so it should be treated as a display-path board rather than a power board, CPU card, or memory module.

Q2. What does this board do in the system?
Based on its published name, this board belongs to the video switching path of the control. In practical terms, it is intended to manage or route video-related signals between the DPD and MDI sides of the control interface. 

Q3. What should be checked when selecting A20B-1005-0110?
The main checks are the exact part number, the installed display configuration, and whether the control uses the same DPD/MDI video-switching arrangement.

Since the public description is very specific, the safest match is based on the original board label and the installed display hardware path.

Q4. How should the “DPD/MDI Video Switcher” description be understood?
It should be read as the board’s primary functional identity. “Video switcher” indicates it is not just a passive PCB, while “DPD/MDI” indicates the signal environment it belongs to. When selecting a replacement, those terms matter more than the board’s appearance alone.

Q5. What is most important to confirm before replacement?
Before replacement, confirm the full board number, the display section it is connected to, and whether the original issue is actually in the switcher board rather than the monitor, keyboard/display unit, or wiring path.

Because this model sits in the display chain, accurate fault isolation matters before treating the video switcher as the failed part.