A20B-8101-0010 Fanuc PCB Board A20B81010010 A2OB-8IOI-OOIO

A20B-8101-0010 | FANUC FS30i Power Supply Module — Series 30i / 31i / 32i CNC / Paired with Main Boards A20B-8101-0400/0401

FS30i — The Power Foundation

CNC-Shopping confirms consistently across multiple FS30i main board listings: "Mounted with FANUC FS30i Power supply module A20B-8101-0010." This appears for: the A20B-8101-0400 (30i-A / 31i-A5 Main PCB A4), the A20B-8101-0401 (30i/31i/32i Main PCB A5, without PC function), and the A16B-3200-0520 (31i-A5 Main CPU). All three are FS30i platform main boards — confirming A20B-8101-0010 as the standard power supply for the entire FS30i main board family.

The FANUC Series 30i/31i/32i represents FANUC's highest-capability CNC platform. A power supply failure halts the entire system. Maintaining a known-good A20B-8101-0010 as a spare is a straightforward risk management step for any facility running this CNC.

Key Product Information

Power Supply Failure — Symptoms

An A20B-8101-0010 fault may appear as:

No initialisation: No display, no CNC activity — complete system silence on power-on.

Intermittent resets: Correlating with operating temperature — marginal capacitors cause rail voltage drop as the unit warms.

Alarm-specific faults: One rail failing while others remain correct produces function-specific failures — memory errors, display failures, or communication faults depending on which rail is affected.

Application Scenarios

FS30i power supply failure: A FANUC 30i system fails to power up. Rail voltage measurement confirms A20B-8101-0010 output is out of specification. Replacement restores correct DC supply and CNC initialisation.

Planned maintenance: A Series 31i-A5 system undergoes scheduled power supply replacement. A20B-8101-0010 is replaced proactively to eliminate power supply-related production risk.

FAQ

Q1: Which FS30i main boards does A20B-8101-0010 supply?

A20B-8101-0400 (30i-A / 31i-A5 A4 type), A20B-8101-0401 (30i/31i/32i A5 type, without PC function), and A16B-3200-0520 (31i-A5 main CPU). All three are standard FS30i main boards, confirming A20B-8101-0010 as the universal FS30i power supply.

Q2: Where is A20B-8101-0010 physically installed in the 30i system?

The power supply installs in the CNC cabinet — separate from the LCD/MDI unit where the main boards mount. Power cables connect the A20B-8101-0010 in the cabinet to the main boards in the operator unit.

Q3: Does replacing A20B-8101-0010 require SRAM data backup?

No. The power supply module holds no CNC data. Replacing it does not affect parameters, programmes, or settings. Data backup is required when replacing main boards or memory modules — not the power supply.

Q4: What are early warning signs of A20B-8101-0010 degradation?

Capacitor ageing in the power supply produces increasing output ripple. Early symptoms include: intermittent CNC alarms clearing after cool-down, display instability at high ambient temperatures, and memory errors during warm conditions. These symptoms warrant proactive replacement before complete failure.

Q5: Is the A20B-8101-0010 also used in the 32i Series?

A20B-8101-0010 for "30i, 31i, 32i series" — all three are confirmed. The FS30i platform covers all three CNC variants, and the power supply module is common across them.