FANUC A350-2101-T058 Circuit Board A35O-21O1-TO58

A350-2101-T058 | FANUC A350 PCB Fabrication Number — Alpha-i Drive Board Family / CNC Industrial Automation

A350 Fabrication Numbers and A20B Commercial Numbers — The Same Board, Two References

FANUC's parts system uses two parallel numbering conventions for the same physical PCB:

Commercial order numbers (A20B-2101-xxxx): The numbers used on purchase orders, maintenance documentation, and commercial spare part listings. This is the number found in FANUC maintenance manuals, spare parts lists, and service documentation.

PCB fabrication numbers (A350-2101-Txxx): The internal drawing reference numbers printed on the board itself. This is FANUC's manufacturing reference — the number that identifies the specific PCB design at the circuit board fabrication level.

The A350-2101-T058 fabrication number corresponds to a board in the A20B-2101 commercial series. Examples of confirmed pairs:

• A20B-2101-0560 ↔ A350-2101-T566
• A20B-2101-0392 ↔ A350-2101-T396

The A350-2101-T058 is the fabrication label for its corresponding A20B-2101 board in the Alpha-i drive board family.

Key Product Information

The A20B-2101 Drive Board Family

The A20B-2101 series — whose fabrication numbers appear in the A350-2101-Txxx range — covers FANUC's drive control and power PCBs for the Alpha-i generation:

Alpha-i aiSV servo drive boards: Including dual-channel HRV control boards that run the current control loops for two servo axes simultaneously. These are the control intelligence inside the SVM2-series twin-axis servo modules.

Alpha-i spindle amplifier control boards: Managing spindle motor speed regulation, orientation, and current control in the aiSP spindle drive modules.

Power supply module boards: Including PCBs for the PSM (αi PS series) that provide the DC bus for all connected servo and spindle modules.

βi series drive boards: Including compact servo amplifier boards for the βi-series servo drives used in economy CNC configurations.

The A350-2101-T058 serves one specific function within this family. The fabrication number on the board label is the authoritative identification for sourcing the correct replacement.

Application Scenarios

Drive module PCB identification from board label: A maintenance technician removes a failed PCB from an Alpha-i drive module. The board label reads A350-2101-T058. Using this fabrication number, the technician identifies the correct replacement from the drive module's spare parts list and orders the replacement board.

Spare parts stocking: A facility maintains drive PCB spares identified by their A350 fabrication numbers from their board labels. The A350-2101-T058 is stocked alongside other Alpha-i drive boards as part of a planned maintenance inventory.

FAQ

Q1: How do I find the A20B commercial order number that corresponds to A350-2101-T058?

Cross-reference the A350-2101-T058 against the spare parts list in the FANUC Alpha-i series maintenance manual for the specific drive module in which this board is installed. The spare parts list maps each PCB slot to its fabrication number and, in most cases, its corresponding commercial order number. FANUC technical support can also confirm the correspondence between a fabrication number and its commercial order number.

Q2: Can I order the A350-2101-T058 using either the fabrication number or the commercial order number?

Most FANUC spare parts suppliers stock boards under the commercial A20B order number. When contacting a supplier, provide the A350-2101-T058 fabrication number and they will cross-reference to the applicable commercial order number for fulfilment. Some suppliers list parts under both numbering systems; always confirm the board matches the installed unit before finalising the order.

Q3: Are there different revisions of the A350-2101-T058?

Like commercial-numbered boards, fabrication-numbered boards can have revision characters appended — for example, A350-2101-T058/01A. The revision suffix identifies hardware updates within the same PCB design. Later revisions are typically backward compatible. When ordering, provide the full fabrication number including any visible revision suffix from the board label.

Q4: What precautions apply when replacing the A350-2101-T058 in an Alpha-i drive module?

Before opening any Alpha-i drive module, confirm the DC bus has discharged to a safe voltage — the capacitor charge is visible on the charge indicator LED or measurable with a calibrated DC voltmeter. The PCB should be handled with ESD precautions: grounded wrist strap, ESD-safe work surface, and antistatic packaging for transport. Power parameters for the drive are stored in the CNC, not in the PCB, so no parameter re-entry is needed after board replacement.

Q5: Is the A350-2101-T058 fabrication board the same physical PCB as the A20B-2101 commercial board?

Yes. The A350-2101-T058 and its corresponding A20B-2101 commercial board are identical physical PCBs. The fabrication number is printed on the board during manufacturing. The commercial order number is used externally for purchasing and documentation. Both references identify the same board — the difference is which context (workshop vs. purchasing) the number is used in.