Buy now the A20B-2101-0234 — Atlantechdrives provides this FANUC Servo Amplifier Power Circuit Board, the internal power PCB used inside the FANUC A06B-6107-H001 6-Axis Servo Amplifier for R-J3iC and R-30iA robot controllers. A critical replacement board for keeping FANUC industrial robots running in automotive, aerospace, and general manufacturing environments worldwide. Express delivery available.
What Is the A20B-2101-0234?
The A20B-2101-0234 is a Servo Amplifier Power Circuit Board manufactured by FANUC Ltd. (Japan). It is one of the two internal power PCBs housed inside the FANUC A06B-6107-H001 6-Axis Servo Amplifier — the other being the A20B-2101-0224. Together these two power boards work alongside the A16B-3200-0610 control circuit board to form the complete internal PCB assembly of the A06B-6107-H001 servo amplifier unit. The A06B-6107-H001 is a 6-axis servo amplifier rated for 3-phase 200–240 VAC input at 5.6 kW total output power, with a maximum combined output current of 125 A. It is designed to drive the six servo axes of high-payload FANUC robots including the R-2000iB/200T, M-900iA/260L, M-900iA/350, M-410iB, and M-900iA/600, when controlled by FANUC R-J3iC or R-30iA robot controllers. The A20B-2101-0234 handles the high-voltage power conversion and distribution functions within the amplifier, converting the rectified DC bus voltage into regulated drive signals for the servo axis output stages. Failures of this board — often caused by capacitor degradation, IGBT driver faults, or transient overcurrent events — result in servo alarms and loss of robot motion on one or more axes. Because the A06B-6107-H001 is discontinued by FANUC and replacement units command high prices, sourcing the individual internal PCB is the most cost-effective repair strategy for maintenance teams.
Key Technical Specifications
- Part Number: A20B-2101-0234
- Board Type: Servo Amplifier Power Circuit Board (internal PCB)
- Parent Unit: FANUC A06B-6107-H001 6-Axis Servo Amplifier
- Compatible Controllers: FANUC R-J3iC, FANUC R-30iA
- Input Voltage (parent unit): 3-phase 200–240 VAC
- Single-phase Control Power: 200–240 VAC
- Total Output Power (parent unit): 5.6 kW
- Maximum Output Current (parent unit): 125 A combined
- Communication Interface: Optical fiber (FSSB — FANUC Serial Servo Bus)
- Companion Boards in Same Unit: A20B-2101-0224 (power board 2), A16B-3200-0610 (control board)
- Manufacturer: FANUC Ltd., Oshino-mura, Yamanashi, Japan
- Status: Discontinued — available as surplus/replacement part
Compatible Robot Models and Applications
The A06B-6107-H001 servo amplifier — and therefore the A20B-2101-0234 power board — is specifically designed for use with FANUC’s high-payload robot models: the R-2000iB/200T (200 kg payload spot welding and handling), M-900iA/260L (260 kg payload heavy transfer), M-900iA/350 (350 kg payload palletising), M-410iB (high-speed palletising), and M-900iA/600 (600 kg payload, one of the highest-payload robots in FANUC’s range). These robots are deployed in automotive body-in-white lines, tier-1 automotive supplier plants, heavy forging and casting facilities, and large-scale logistics and palletising operations globally. When the A20B-2101-0234 fails in a production environment, the robot typically generates a servo alarm on one or more axes and enters an emergency stop state, halting the entire production cell. Given that FANUC robots of this generation have installed base lifespans exceeding 20 years in many plants, the demand for replacement internal PCBs remains strong long after the parent amplifier unit has been discontinued by the manufacturer.
Maintenance Tips
Before replacing the A20B-2101-0234, always discharge the DC bus capacitors in the A06B-6107-H001 amplifier fully before touching any internal PCB — the DC bus can retain dangerous voltages for several minutes after main power is removed. Use a calibrated voltmeter to verify that bus voltage has dropped below 30 VDC before opening the amplifier enclosure. When removing the A20B-2101-0234, document the connector positions with photographs before disconnecting — the board uses multiple keyed connectors but mislabelling during reinstallation is a common field error that causes further faults. Inspect the companion A20B-2101-0224 board and the A16B-3200-0610 control board for signs of thermal damage or electrolyte leakage from capacitors simultaneously — if one board has failed from age-related capacitor degradation, the others are likely at similar end-of-life. After installing a replacement A20B-2101-0234, perform a controlled power-up with the robot in emergency stop before releasing to automatic mode, and monitor all six servo axis currents during the first motion cycle to confirm stable operation across all axes.
Frequently Asked Questions
Q: Can I replace only the A20B-2101-0234 board instead of the entire A06B-6107-H001 amplifier unit?
A: Yes. Replacing the individual internal PCB is the standard cost-effective repair approach for the A06B-6107-H001. The complete amplifier unit commands a significantly higher price than the individual board. Provided the IGBT power modules and other hardware components of the amplifier are intact, replacing the A20B-2101-0234 restores full amplifier function. Always verify the fault is isolated to this board before purchasing.
Q: What FANUC alarm codes typically indicate a failure of the A20B-2101-0234 power board?
A: Failures of the servo amplifier power board typically generate FANUC servo alarms in the 4xx or 9xx range on the R-30iA teach pendant, commonly SV-001 (servo not ready), SV-043 (DCAL), SV-044 (HVAL — overvoltage on DC bus), or SV-045 (HCAL — overcurrent). A fault specific to the power board may also be indicated by the amplifier’s 7-segment LED display showing codes such as «8» (DC bus overvoltage) or «A» (overcurrent). Consult the FANUC R-30iA Maintenance Manual (B-83195EN) for the full alarm code reference.
Q: Is the A20B-2101-0234 the same board as the A20B-2101-0224?
A: No. Both are power circuit boards installed inside the A06B-6107-H001, but they are different PCB variants assigned to different axis groups within the 6-axis amplifier. Both boards must be present and functional for the amplifier to operate correctly. Replacing one without inspecting the other is not recommended if the root cause of the failure is DC bus surge or capacitor degradation, as both boards are subject to the same stress conditions.
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