Each unit is opened, inspected, and rebuilt at the component level. Failed parts come from inventory or off donor units. Bench verification before ship.
N210
Power stage rebuild
IGBT modules, gate drivers, and DC bus capacitors replaced on Fanuc alpha / beta, Mitsubishi MR-J, and Yaskawa Sigma amplifiers.
N220
Control board work
Component-level board repair, firmware checks, and feedback-channel verification on encoder interfaces and serial loops.
N230
Cooling & power supply
Cooling-fan replacement, power-supply rebuild, and thermal-path inspection on cabinet-mounted hardware.
N240
Bench testing
Electronic test setup with dummy load and feedback emulation. Performance check before ship.
N250
Donor parts service
19,000+ unit in-house pool. Aftermarket parts and donor units for legacy CNC amplifier hardware.
N260
Repair scope
Hardware repair only. CNC parameters, ladder logic, and machine commissioning stay with the customer or integrator.
Failed IGBT modules, blown DC bus capacitors, and gate-driver damage. Often follows a power-event or cooling-fan failure on the cabinet.
Cooling & thermal
Cooling-fan failure, heatsink contamination, and thermal-stress damage on the power module after years of shop-air exposure.
Control electronics
Encoder-interface damage, communication-module failure, and capacitor aging on the control board.
Cabling and connectors
Damaged feedback cables, encoder connector wear, and contamination on encoder pins.
N500 Workflow
From part number to ship-back
Same four-step path through the shop whether the drive came off a Mazak machining center or a Fanuc-controlled grinder.
N510
Get in touch
Call or email with the part number, machine context, and a photo of the nameplate if it helps.
N520
Bench review
Tech inspects the drive, runs it on the test bench, and confirms what failed.
N530
Cost & approval
We call back with the cost and a rough turnaround. Nothing is started without your sign-off.
N540
Repair, test, ship
Failed components replaced from inventory or off donors, drive verified on the bench, and shipped back.
N600 Common questions
Common questions about CNC drive repair
Application-specific questions. For brand-specific FAQs, see the dedicated brand page above.
What types of CNC servo drives do you repair?
Servo drives and amplifiers from Fanuc (alpha / beta series), Siemens (SINAMICS S120 and 611D), Mitsubishi (MR-J series), Yaskawa (Sigma series), Allen-Bradley (Kinetix and Ultra), Indramat (DDS, EcoDrive), Kollmorgen, and Baldor. Coverage spans machining centers, lathes, grinders, and EDM machines.
What machine builders come through the bench?
Drives come through from Mazak, Okuma, Mori Seiki / DMG Mori, Haas, Doosan, Kitamura, Makino, and other CNC OEMs.
Do you provide CNC parameter setup or ladder logic work?
No. Hardware repair only. CNC parameters, ladder logic, machine geometry, and commissioning stay with the customer or integrator. Parameters stored externally must be reloaded after hardware repair.
Can you repair legacy CNC drives no longer supported?
Yes. Discontinued Indramat DDS, older Allen-Bradley Ultra series, and legacy Yaskawa drives come through routinely. The 19,000+ unit donor pool covers a lot of out-of-support hardware.
Do you provide on-site service?
No. Bench repair is the standard service: ship the drive to Westland, MI for rebuild and testing.
How long does a repair usually take?
Lead time varies job to job, partly because parts are often pulled from donor boards. Give us a call with the part number and the situation.
What is the warranty?
One year on parts and workmanship for repairs and rebuilt units. Standard exclusions apply for power surges, contamination, improper installation, and out-of-spec operation.
N700 More from NC Servo
Related repair coverage
Other industry pages and the brand pages most-tied to CNC machine drives.
Give us a call or send a part number with the machine context and the symptom. We'll check the donor pool, suggest a rebuilt match if we have one, and walk through repair or cross-brand options if we don't.
