Circuit Board A20B-0007-0090 A2OB-OOO7-OO9O A20B00070090

FANUC A20B-0007-0090 System 6 Add Axis Board

A20B-0007-0090 is a legacy additional axis board for FANUC System 6 controls. It is consistently tied to System 6 / 6M applications, described as an add axis board, a 2-axis analog board, and a board using pulse coder input.

One specialist reference also notes that it can support a 3rd, 4th, or 5th axis depending on configuration, while another lists compatibility across 6A, 6B, 6M, 6MB, 6T, and 6TB controls.

That combination makes it a very specific control board: it belongs to the additional axis section of older FANUC System 6 platforms and is tied to analog axis control rather than to a digital servo, display, or memory function.

In practice, it is the kind of board selected when the installed system already uses the original System 6 axis-expansion structure and has to keep that layout intact.

Technical Data

Application Scenarios

This board is well suited to System 6 CNC repair, legacy axis-expansion replacement, and restoration of additional axis functionality in older FANUC machining or turning controls. It is especially relevant where the installed control still depends on analog axis architecture and pulse-coder based axis measurement inside the original System 6 hardware path.

Why Choose This Product

A20B-0007-0090 is a strong fit when the machine already uses a System 6 additional axis board and the replacement must preserve the original axis structure. The combination of analog axis control, pulse coder input, and System 6 compatibility makes it far more specific than a generic axis-control PCB.

Replacement Guide

Before replacement, confirm the exact board number, the installed control version within the System 6 family, and the machine’s axis configuration. It is also important to verify whether the added-axis section is using the same analog / pulse-coder arrangement, since that is central to how this board is applied.

FAQ

Q1. What type of board is A20B-0007-0090?
It is an additional axis board for FANUC System 6, described as a 2-axis analog add axis PCB with pulse coder input.

Q2. What does this board do in the system?
Its role is to support the additional axis section of the control. It extends axis capability inside System 6 hardware and is associated with analog axis control rather than memory, display, or machine I/O.

Q3. What should be checked when selecting A20B-0007-0090?
Check the part number, the System 6 control variant, and the axis configuration already installed. Compatibility across 6A, 6B, 6M, 6MB, 6T, and 6TB is noted, but the actual machine setup should still be confirmed before replacement.

Q4. How should the key specification be understood?
The important identifiers are System 6, add axis, 2 axis, and analog. These define the board’s control family, motion role, and control style.

The pulse coder note is also important because it points to the axis measuring method used with this board.

Q5. How should faults be diagnosed before replacing this board?
A practical diagnosis starts by separating an additional axis control fault from a motor, pulse coder, or analog drive fault.

If the issue is concentrated in the added-axis section and the System 6 main control remains otherwise stable, the add axis board becomes a stronger candidate.