GE A20B-0007-0750 | Control Board CNC System PCB

The GE A20B-0007-0750 manages critical functions within GE Fanuc CNC systems. This control board processes signals for axis positioning and spindle control. You can find it inside Series 15, 16, or 18 CNC controllers. The unit handles communication between the main processor and servo drives.

Processing and Electrical Specifications

Parameter	Specification
Brand	GE Fanuc (General Electric)
Model	A20B-0007-0750
Product Type	Control Board (PCB)
PCB Layers	6-layer FR4
Board Dimensions	210 mm x 150 mm
Weight	0.38 kg (0.84 lbs)
Component Count	312 discrete parts
Operating Voltage	5 VDC and ±15 VDC
Current Consumption	1.2 A typical
Processor Type	32-bit RISC (custom ASIC)
Clock Frequency	40 MHz

The GE A20B-0007-0750 operates from a 5 VDC logic supply and ±15 VDC analog rails. This control board consumes 1.2 amps during normal operation. You can rely on its six-layer FR4 construction for signal integrity. The board uses a custom 32-bit ASIC for high-speed motion calculations.

Physical Dimensions and Weight

Parameter	Specification
Weight	0.38 kg (0.84 lbs)
Length	210 mm
Width	150 mm
Thickness	1.6 mm (PCB)
Component Height	25 mm maximum
Copper Thickness	35 µm per layer
Mounting Holes	6 (M3 clearance)
Solder Mask	Green (both sides)

This control board weighs 0.38 kg for secure chassis mounting. The board measures 210 mm long by 150 mm wide. Its PCB thickness reaches 1.6 mm with six internal copper layers. You can mount the GE A20B-0007-0750 using six M3 screws through the designated holes.

Connectors and Interface Points

Four 50-pin ribbon cable headers connect to servo amplifier modules. Two 34-pin headers handle encoder feedback signals from the servos. You will find one 20-pin header for the CNC main CPU connection. The board includes a 3-pin power input connector for DC supplies. Additionally, six 2-pin test points provide access for oscilloscope probing.

Energy Storage and Component Layout

The GE A20B-0007-0750 stores moderate energy for local filtering. Twenty-four electrolytic capacitors provide 1,500 µF of total bulk storage. These capacitors smooth power supply ripple for the analog circuits. The board does not contain any battery for program retention. Instead, a separate memory board stores all CNC parameters.

Internal Components and Construction

A custom gate array handles all motion command generation and feedback processing. Twenty-four operational amplifiers condition analog signals for servo control. You will find 142 resistors, 98 capacitors, and 36 integrated circuits on the board. The GE A20B-0007-0750 includes eight precision potentiometers for factory calibration. A metal bracket provides EMI shielding over the processor section.

Diagnostic Indicators and Use

Eight red LEDs show status for axis enable, fault, and power conditions. You can observe these LEDs through a cutout in the CNC chassis. Transitioning to this board restores CNC axis control functionality. Use the GE A20B-0007-0750 in machining centers, lathes, or grinding machines. For best results, handle this board with proper ESD protection at all times.