A20B-3300
Model: A20B-3300 series
Type: CNC CPU board, graphic display board, memory expansion module
Manufacturer: FANUC
Application: FANUC 0i, 16i, 18i, 21i, 30i CNC systems
Status: Most models discontinued, supplied with used and refurbished units
Description
Model: A20B-3300 seriesType: CNC CPU board, graphic display board, memory expansion moduleManufacturer: FANUCApplication: FANUC 0i, 16i, 18i, 21i, 30i CNC systemsStatus: Most models discontinued, supplied with used and refurbished units
Main Functions
CPU board: System operation, PMC logic, motion control, bus managementDisplay board: Interface processing, screen display, path simulationMemory board: Data storage, program cache, memory capacity expansion
General Specifications
Power supply: DC 5V, DC 24VOperating temperature: 0°C ~ 55°CHumidity: 5%-95% RH, non-condensingProtection: Overvoltage, overcurrent and static protection
Common Sub Models
A20B-3300-0020: Graphic display board for 16i/18i/21iA20B-3300-0084: CPU memory board with 8MB storageA20B-3300-0105: Standard main control CPU boardA20B-3300-0280: High-capacity memory expansion board
Safety Rules
Cut off power and wait 5 minutes before replacement
Wear anti-static wrist strap to avoid component damage
Forbid hot plug of connectors and cables
Do not modify internal circuit structure
Installation Steps
Fully power down the CNC system
Insert board into correct slot and fasten screws
Connect internal bus and power cables firmly
Check all connection status
Restart device and verify system operation
Maintenance
Clean dust regularly on board surface and portsCheck connectors for looseness and agingReplace backup battery periodically to prevent data lossKeep cabinet dry and dust-free
Troubleshooting
System boot failure: Check board installation and power supplyBlank screen: Inspect display board and signal lineProgram loss: Test battery voltage and memory moduleSystem lag: Verify memory board working condition
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