CNC Circuit Board & Electronics Repair
Component-level repair for CNC controller boards, servo amplifier boards, spindle drive electronics, and all CNC machine circuit boards. Free evaluation — repair or no charge — 2-year warranty.
CNC Circuit Boards We Repair
Component-level diagnosis and repair for every major board type found in CNC machinery
CNC Controller Boards
Main CPU and logic boards — the core of Fanuc, Siemens SINUMERIK, Mitsubishi M-Series, and Haas control units. Component-level repair restores full control system function.
Servo Amplifier Boards
Drive electronics for X, Y, Z, and rotary axis servo motors. Failed IGBTs, gate drivers, current sensing circuits, and power regulation components replaced at component level.
Spindle Drive Boards
Control electronics for CNC spindle drives. Power bridge failures, overcurrent protection, speed reference circuits, and spindle orientation board faults all diagnosed and repaired.
I/O Interface Boards
Digital and analog I/O boards for machine inputs, outputs, and signal conditioning. Blown optocouplers, relay driver circuits, and failed I/O expansion modules repaired.
Power Supply Boards
CNC-specific power supply boards including 24V logic supplies, servo bus supplies, and multi-rail PSUs. Failed capacitors, switching transistors, and voltage regulators replaced.
Axis Control Cards
Individual axis control PCBs for multi-axis machining centers. Interpolation circuitry, velocity loop, and position control electronics diagnosed and repaired.
Feedback Interface Boards
Encoder signal processing and feedback interface boards. Fanuc serial encoder interface, Heidenhain EnDat/1 Vpp, and resolver interface circuits repaired.
Display / HMI Boards
CNC operator panel display electronics, MDI keyboard interface boards, and machine control panel PCBs. Backlight drivers, video signal boards, and LCD controller circuits.
CNC Systems & Brands We Service
Controller-specific expertise for the industry's leading CNC platforms
CNC Series
The most widely deployed CNC control system in North America. Full board-level repair for all Fanuc CNC series — including discontinued models with long OEM lead times.
SINUMERIK
Component-level repair for the complete Siemens SINUMERIK CNC family. NCU boards, drive modules, and operator panel electronics for all SINUMERIK generations.
M-Series CNC
Repair for Mitsubishi CNC controller and servo amplifier boards across the M-Series lineup, including high-speed machining center variants.
All Haas Series
Full board repair for Haas CNC control systems including VMC, HMC, and lathe platforms. Power board, servo board, and I/O board repair for all Haas generations.
Mazatrol
Repair for Mazatrol conversational and EIA/ISO control electronics. PC-based Fusion and Smooth control board repairs accepted.
OSP Control
Board-level repair for Okuma OSP CNC systems. CPU boards, servo control cards, and I/O boards for OSP-U series and legacy OSP5000 platforms.
TNC Series
Repair for Heidenhain TNC contouring controls. Logic boards, position encoder interface cards, and main computer units for all TNC generations.
All Other CNC Brands
We also repair Fagor 8055 and 8070 series, Dynapath Delta and System 10/20, as well as Num, Bosch, and older Bandit/Anilam controls. If it's a CNC board, we evaluate it.
WinMax / MAX Series
Repair for Hurco MAX and WinMax control electronics. Servo interface boards, VMX axis boards, and control power supply modules accepted.
Common CNC Board Faults We Diagnose
These alarm codes and symptoms frequently indicate a repairable board-level failure
Servo Alarm / Amplifier Fault
Overcurrent, IGBT failure, or gate drive failure in the servo amplifier board. Often repairable at component level — replacing the servo amplifier module is rarely necessary.
Spindle Fault
Spindle drive board power stage failure or current feedback circuit fault. Blown IGBT modules, current sensors, or gate driver ICs identified and replaced.
E-Stop / Safety Circuit Failure
Hardwired safety relay board failure, E-stop monitoring circuit fault, or failed contactor feedback loop. Safety circuit diagnosis and component-level repair performed.
Communication Error
Fanuc FSSB fiber communication failure, Profibus DP interface fault, or serial bus error between the CNC control and servo/spindle drives. Interface board repairs accepted.
Power Supply Failure
CNC control power supply board failure — 5V, 12V, 24V rail collapse. Failed capacitors, switching transistors, and PWM controller ICs identified and replaced at component level.
Encoder Feedback Error
Encoder interface board failure causing position feedback loss. Fanuc Pulsecoder interface circuits, Heidenhain EnDat receiver ICs, and resolver interface boards repaired.
How CNC Board Repair Works
A straightforward 5-step process — from shipping your board to receiving it back repaired and tested
Ship & Receive
Pack your board carefully and ship to our Lewisville, TX facility. We confirm receipt within 24 hours.
Free Evaluation
Full component-level diagnostic within 24–48 hours of receipt. No charge, no obligation to proceed.
Written Quote
Receive a detailed quote: root cause found, components to be replaced, and exact repair cost. Your approval before any work starts.
Component Repair
Board repaired using quality components. Root cause fixed — not just alarm codes cleared or boards swapped arbitrarily.
Test & Return
Board fully tested on CNC-specific test fixtures. Ships with 2-year warranty documentation and tracking confirmation.
Why Repair Your CNC Board Instead of Replacing It?
For most CNC board failures, repair is dramatically cheaper, faster, and less disruptive than replacement
vs. New OEM Boards
New Fanuc circuit boards cost $3,000–$20,000+. Component-level repair is a fraction of OEM pricing — get a quote to know your exact price.
No Long Lead Times
Many Fanuc Series 0/16/18 and Siemens SINUMERIK 840D boards are discontinued or on 6–18 week OEM lead times. Repair gets your machine running in days, not months.
Machine Stays Calibrated
Repairing your existing board preserves stored parameters, pitch error compensation, and machine offsets. No re-homing cycles or backlash re-calibration required after reinstallation.
Frequently Asked Questions
Common questions about CNC circuit board repair
Can you repair Fanuc CNC circuit boards?
Yes. Fanuc is one of the most common CNC systems we repair. We perform component-level repair on Fanuc Series 0, 16, 18, 21, and 31i controller boards, servo amplifier boards, spindle drive boards, and power supply boards. Many of these boards are discontinued by Fanuc or on long lead times — repair is often the only practical option for getting a machine running quickly.
What happens to the machine parameters and firmware during repair?
In most cases, parameters stored in battery-backed SRAM on the controller board are preserved during repair. We take precautions to maintain battery power during the repair process. However, if the SRAM or flash storage is damaged as part of the failure, parameter backup from the machine before shipping is strongly recommended. Firmware versions are not changed unless specifically requested — the board is returned with the same firmware it arrived with.
Do you re-parameterize or re-commission the CNC after board repair?
No — re-parameterization is the machine owner's responsibility after the repaired board is reinstalled. Because we repair your original board rather than swapping it for a different unit, the machine parameters, tool offsets, and pitch error compensation data stored on the board are typically preserved. This is one of the key advantages of board repair over board replacement: your machine re-starts where it left off with minimal recommissioning effort.
How do I safely remove and ship a CNC board for repair?
Power down the CNC and wait at least 5 minutes for capacitors to discharge before opening the electrical cabinet. Note the board's connectors and orientation with photos before disconnecting anything. Handle the board only by its edges — avoid touching components directly. Place the board in an anti-static bag (available at any electronics supplier), then pack it between at least 2 inches of foam or bubble wrap on all sides. Ship via FedEx or UPS ground to our Lewisville, TX facility. Contact us for a shipping label if needed.
When is CNC board repair not feasible?
Repair is not possible when a board has suffered catastrophic physical damage — severe burning that destroys PCB traces, board delamination from a liquid intrusion event, or mechanical damage that breaks the substrate itself. In those cases, we will notify you during the free evaluation phase before any charges are incurred. We will also advise on alternative sourcing options if repair is not feasible.
Nationwide CNC Board Repair — Based in Lewisville, TX
Located in the Dallas-Fort Worth metro, Flexa Systems repairs CNC circuit boards for machine shops, job shops, and manufacturers across all 50 states. Ship your board to us, we repair and test it, and ship it back — typically within 48–72 hours of approval. Local drop-off available for DFW customers.
Ready to Get Your CNC Board Evaluated?
Free evaluation, no obligation. Repair or no charge guarantee. All major CNC brands accepted — Fanuc, Siemens, Mitsubishi, Haas, and more.