The FANUC A16B-3200-0420 is a Main CPU PCB and Master PCB used in compatible FANUC Series 16i, 160i, and 160is Model B stand-alone CNC control units.

FANUC maintenance documentation identifies the exact board as the 16i/160i/160is Main CPU Board, with hardware identification code 3X0C. It forms the main hardware platform for the CPU card, memory modules, axis-control hardware, display-control card, communication interfaces, and other CNC functions installed in the control unit.

The term stand-alone refers to the FANUC control architecture in which the CNC basic unit is installed separately from the LCD or operator panel. It does not mean that the A16B-3200-0420 can operate independently without the corresponding CPU card, memory, system software, back panel, power supply, display interface, and machine data.

Depending on the original configuration, the board may support interfaces associated with:

• RS-232C serial communication
• FANUC I/O Link
• Serial spindle and position-coder signals
• Analog output and high-speed digital input
• LCD/MDI display communication
• Memory-card operation
• Servo-axis and CNC option cards

The exact available functions depend on the installed card configuration and board revision.

Organic search results commonly describe the A16B-3200-0420 as:

• FANUC 16i/160i Model B Main CPU Board
• FANUC 16i-B Master PCB
• FANUC 160i-B CNC Main Board
• FANUC Stand-Alone Main CPU PCB
• FANUC CNC Control Motherboard

The board may be suitable for replacing a confirmed fault associated with CNC startup failure, CPU alarms, failure to recognize installed cards, intermittent system operation, communication faults, memory-related errors, or physical damage to the PCB.

• Main-board startup and interface functions tested before shipment
  
• In stock and prepared for prompt dispatch
  
• Worldwide DHL, UPS, and FedEx shipping

Product Details

• Brand: FANUC
• Part Number: A16B-3200-0420
• Alternative Format: A16B32000420
• Official Product Type: Main CPU Board
• Alternative Product Name: Master PCB / CNC Main Board
• Primary CNC Family: Series 16i / 160i / 160is
• Control Generation: Model B
• Control Architecture: Stand-Alone Type
• Hardware Identification: 3X0C
• Board Structure: Configurable / Card-Dependent
• Product Series: A16B-3200
• Application: Compatible FANUC i-Series CNC Controls
• Category: FANUC Main Board / CNC CPU PCB
• Supply Configuration: Bare, partially populated, or fully populated, subject to stock
• Testing: Inspected and tested under an applicable FANUC CNC configuration

The main-board designation, Model B system families, hardware ID, and stand-alone control structure are documented in FANUC maintenance and parts information.

Documented Basic Units

FANUC documentation lists the following stand-alone basic units for the Series 16i/160i/160is Model B hardware structure:

• A02B-0281-B801: Basic Unit with One Slot
• A02B-0281-B803: Basic Unit with Three Slots

The A16B-3200-0420 should be matched with the original basic unit, back panel, slot arrangement, power supply, and installed card configuration.

Specification Revision Clarification

The original FANUC B-63525EN/02 documentation identifies:

• A16B-3200-0420: 16i/160i/160is Main CPU Board
• A16B-3200-0421: 18i/180i/180is Main CPU Board
• A16B-3200-0425: 21i/210i/210is Main CPU Board

A later FANUC specification-change sheet lists:

• A16B-3200-0427: Later 16i/160i/160is Main Board
• A16B-3200-0420: Old-specification board for selected 18i/180i/180is-MB5 configurations
• A16B-3200-0429: Later 18i/180i/180is Main Board
• A16B-3200-0421: Earlier 18i/180i/180is specification

This revision history means the exact A16B-3200-0420 application should be confirmed from the original CNC system rather than assuming every unit belongs to only one system designation.

Sales & Support

Each A16B-3200-0420 Main CPU PCB is inspected and tested under an applicable FANUC CNC configuration before delivery.

The installed CPU, memory, axis, and display-card configuration will be confirmed before shipment. REACO CNC provides PCB repair service, warranty coverage, testing-video support, data-backup guidance, configuration assistance, and technical support for FANUC CNC control systems.

Worldwide delivery is available through DHL, UPS, FedEx, and other express carriers.