CNC System Repair and Service

Comprehensive CNC Electronics Service

CNC (Computer Numerical Control) machines are the heart of modern industrial manufacturing. Their failure means production line downtime and significant financial losses. At EFIXLAB we specialize in fast diagnostics and effective repair of all electronic components of CNC systems.

What We Repair in CNC Systems

CNC Controllers

We repair numerical controllers from all leading manufacturers:

Siemens Sinumerik (840D, 828D, 808D) — mainboard repair, NCU modules, communication interfaces
Fanuc Series (0i, 16i, 18i, 21i, 30i, 31i, 32i) — CPU module regeneration, memory, I/O circuits
Heidenhain TNC (620, 640, iTNC 530) — processor board service, screens, communication modules
Mitsubishi (M70, M80, E80) — central unit repair, expansion cards
Mazak, Okuma OSP, Haas — diagnostics and regeneration of complete controllers
NUM, Bosch Rexroth IndraMotion — CNC control system service

Power Modules and Drives

The most common power module failures are blown IGBT transistors, damaged rectifier bridges, gate driver circuit failures, and filter capacitor problems. We repair:

Siemens Simodrive (611, 840D) — IGBT module replacement, capacitors, braking resistors
Fanuc Alpha/Beta Servo — power amplifier regeneration, power component replacement
Indramat/Bosch Rexroth — servo drive repair, inverters, power supply modules
Lenze, SEW Eurodrive — frequency converter service for CNC
Yaskawa Sigma — servo drive and absolute encoder repair

Mainboards and Processor Modules

CNC controller mainboards contain advanced microprocessor circuits, NVRAM memories with user programs, and communication interfaces. We repair:

Damage from surges and electrostatic discharges
Memory problems — backup battery replacement, data recovery
Communication port failures RS232, RS485, Ethernet
Damaged processors, FPGA circuits, Flash and RAM memory
Corrosion after flooding or moisture exposure

Operator Panels and HMI

Operator panels are the interface between the operator and the machine. We repair:

Keypad panels — membrane replacement, contact cleaning, backlight repair
Touchscreens — calibration, digitizer replacement, LCD matrix repair
Graphic panels — control board regeneration, LED/CCFL backlight replacement
MPG pulse generators — manual encoder repair, switch service

Power Supplies and Power Modules

Stable power is the foundation of reliable CNC operation. We repair power supplies:

24 V DC for controller logic and inputs/outputs
±15 V, +5 V for analog and digital circuits
High-voltage for servo drives (300–600 V DC)
UPS and energy buffering systems

Typical CNC System Failures

Alarm and Communication Errors

Controller alarms often result from electronic problems:

Alarm 401–404 (Fanuc) — encoder or cable damage
Alarm 20041 (Siemens) — communication module failure
Overload/Overheat — power module overheating, cooling problems
Battery Low — dead backup battery, risk of parameter loss
Servo Error — problems with amplifiers, encoders or wiring

Mechanical Failures Causing Electronic Damage

Tool collisions, axis jams can damage:

Servo drives through current overload
Encoders through mechanical impact
Limit switches and reference sensors

Cooling Problems

Fan failure or heatsink contamination leads to overheating:

Burnt IGBT power transistors
Electrolytic capacitor degradation
Temperature regulation circuit damage

Order Your Repair Today

CNC machine downtime is costly. Don\'t wait — contact us today to schedule diagnostics and repair of your CNC system.