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$1,157.00 USD
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FANUC A20B-2004-0800 is a servo amplifier gate driver board used inside compatible FANUC drive hardware. It interfaces the amplifier control section with the power-switching stage, providing gate-control signals for regulated servo motor power output.
This listing covers the internal PCB only, not a complete servo amplifier or CNC motherboard. Documented examples carry board code A350-2004-T804 and revision suffixes including /03B, /04B and /05B. Check the suffix printed on the original board before replacement.
A20B-2004-0800 Product Information
| Brand | FANUC |
| Model / MPN | A20B-2004-0800 |
| Alternate Format | A20B20040800 |
| Product Type | Servo amplifier gate driver board |
| Internal Board Code | A350-2004-T804 on documented versions |
| Documented Revisions | /03B, /04B and /05B |
| Primary Function | Gate-signal control and power-device interfacing |
| Application | Compatible FANUC servo amplifier hardware |
| Host Amplifier | Confirm the complete A06B model from the original drive |
| Supply Scope | PCB only; amplifier housing and power modules excluded |
| Country of Origin | Japan |
| Condition | New, refurbished, or used 90% new; subject to stock |
| Testing | 100% tested before shipping; test video available |
| Handling | Normally 1–3 business days |
| Shipping / ETA | DHL, UPS, or FedEx worldwide; typically 3–7 business days |
| Warranty | 1 year for new/refurbished; 3 months for used 90% new |
| Service / Packing | Free technical support; anti-static reinforced packing |
Servo Amplifier Gate-Drive Function
The A20B-2004-0800 distributes switching commands between the amplifier control circuitry and power-semiconductor stage. Correct gate-drive operation is essential for controlled current delivery to the servo motor. This PCB does not independently execute CNC programs or operate as a complete drive.
Revision and Amplifier Compatibility
Confirm the full marking, such as A20B-2004-0800/03B, rather than matching only the base number. Compare the A350 board code, connectors, component layout and complete A06B amplifier model. A20B-2004-0801, -0802, -0805 and -0806 should not be treated as interchangeable without configuration confirmation.
Testing and Installation
REACO CNC checks the board number, revision, substrate, connectors, capacitors, gate-drive components, solder joints and signs of overheating, followed by compatible amplifier testing where applicable. Qualified personnel must isolate power and allow the DC bus to discharge fully before service.
Related resources: FANUC circuit boards, FANUC servo drives and FANUC drive repair service.
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