• 38422 Webb Dr Westland , MI 48185
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Repair Information
Third-Party Fanuc Servo Amplifier & CNC Control Repair | NC Servo Technology
NC Servo Technology - Westland, Michigan 734-326-6666
NC Servo Technology Independent industrial repair facility

Independent Repair Shop. Not Fanuc.

Third-Party Repair of Fanuc Servo Amplifiers & CNC Controls

Independent third-party repair of Fanuc CNC machining-center hardware: Alpha and Beta series servo amplifiers, spindle drives, Power Supply Modules, and System CNC control boards. Backed by a 19,000+ unit in-house inventory we pull aftermarket and donor parts from. NC Servo is not affiliated with FANUC Corporation. Working on this kind of hardware since 1975.

Get a Repair Quote All Drive Services
Fanuc CNC focus Servo amps, spindle drives, and CNC system boards from machining-center applications.
Alpha and Beta series Both Fanuc amplifier lines covered, current and earlier generations.
One-year warranty Standard on parts and workmanship for Fanuc repairs and rebuilt units.

CNC Machining Centers

Fanuc lives on the CNC side of the shop floor

Fanuc hardware shows up almost entirely on CNC machining centers, lathes, and mills. The repair work splits into two halves: the servo amplifier and spindle drive side that moves the machine, and the CNC system control side that runs the program. We work on both, separately or together.

  • Servo amps and spindle drives drive the axes and the spindle on the machine.
  • CNC system control boards (CPU, I/O, power supply, display) run the part program and the operator interface.
  • Power Supply Modules feed the rest of the rack with regulated DC bus voltage.
  • Most Fanuc shop work covers a mix of these on machines from the late 1980s to current production.
Electronics test bench for servo drives and electronic controls

Service Coverage

What NC Servo does with Fanuc hardware

NC Servo opens each Fanuc unit on the electronics bench, finds what failed, and rebuilds it at the component level using replacement parts from inventory or pulled off donor units. Both servo amps and CNC control boards run through the same shop.

Alpha & Beta servo amps

Alpha series (Alpha, Alpha-i, Alpha-iA, Alpha-iB) and Beta series (Beta, Beta-i, Beta-iB) servo amplifiers. Power-stage diagnostics, gate-driver work, and encoder-interface checks.

Spindle drives & Power Supply Modules

Fanuc spindle drives and PSM units that feed the amp rack. Bus capacitor replacement, rectifier work, and output regulation under load.

System CNC control boards

CPU, I/O, power-supply, and display-interface boards from System 6, 11, 15, 16, 18, 21, and 30i / 31i / 32i CNCs.

Fanuc Series

Fanuc product families on the bench

We are a small repair shop, not a Fanuc distributor. The series below are simply the ones that come through the door often enough to be familiar. If your part number is not on this list, send it anyway. We work on what we can.

Alpha series Alpha, Alpha-i, Alpha-iA, and Alpha-iB servo amplifiers used on most current and recent CNC machining centers.
Beta series Beta, Beta-i, and Beta-iB smaller-frame servo amplifiers used on auxiliary axes and lighter CNC applications.
PSM & spindle drives Power Supply Modules feeding the amp rack, plus Alpha-i spindle drives that run the main spindle.
System CNC boards System 6, 11, 15, 16, 18, 21, and 30i/31i/32i family control boards, plus Power Mate hardware.

Common Faults

What usually shows up on a Fanuc unit

Fanuc throws a fault code when something is wrong. A code or alarm number plus the part number is often enough to start the diagnosis. The categories below cover the kinds of trouble that show up on Fanuc hardware.

Servo amp alarms Over-current trips, IGBT shorts, regenerative-resistor faults, or gate-driver failures on Alpha and Beta amplifiers.
Power Supply Modules Aged bus capacitors, rectifier failures, low DC bus output, or PSM alarms shutting the rack down.
Encoder & feedback Encoder signal errors, position-deviation alarms, serial-encoder communication faults, or feedback channel failures.
CNC control boards CPU board failures, I/O board faults, display interface problems, or System power supply issues on the CNC side.

Repair Path

From part number to ship-back

Most Fanuc jobs follow the same four steps. Lead time varies because some Fanuc repairs need parts pulled off a donor unit, so we only commit to timing once a tech has the unit on the bench.

Get in touch

Phone or email with the Fanuc part number, the alarm code if there is one, and a quick note on the symptom.

Bench review

Once the unit arrives, a tech opens it, inspects boards and the power stage, and runs it on the electronics bench to confirm the fault.

Cost & approval

We call back with the cost and a rough turnaround. Nothing happens without your sign-off.

Repair, test, ship

Failed components are replaced from inventory or off donors, the unit is checked under load on the bench, and the unit ships back.

Electronics test stand with instruments for servo drive verification

Bench Verification

Each Fanuc unit gets checked under load

Repaired Fanuc servo amps and spindle drives run on the electronics bench under load. CNC control boards get power-up checks and board-level signal verification. Either way, the unit gets exercised before it ships back.

  • DC bus and gate-driver rails verified across the supply voltages.
  • Replaced components checked under load on the bench, not just at idle.
  • Encoder and serial-feedback signals verified where the model supports it.
  • Repair backed by a 1-year warranty on parts and workmanship.

Inventory & Parts Pool

A 19,000+ unit pool with Fanuc hardware in it

NC Servo's in-house inventory holds over 19,000 drives and valves accumulated since 1975, including a healthy share of Fanuc Alpha, Beta, PSM, and System control boards. That pool is where the shop pulls aftermarket parts and donor components for older CNC hardware.

  • Aftermarket and donor parts for Alpha, Beta, PSM, spindle drives, and System CNC boards.
  • If we have a rebuilt match for your part number, trade in your old unit for a discount on the rebuilt.
  • No match on the shelf? We can suggest a comparable Fanuc or cross-brand option, or repair yours.
  • Rebuilt units carry the same 1-year warranty as a fresh repair.
Organized warehouse shelves with drives and components at NC Servo Technology
Bench equipment used for verification

Repair Scope

What NC Servo handles, and what your team handles

NC Servo handles the Fanuc hardware itself: amplifier power stages, control boards, capacitors, gate drivers, encoder interfaces, and CNC board components. Most repaired units come back with the program intact; putting the unit back on the machine and running the part program stay with your team.

  • Power-stage repair, capacitor replacement, gate-driver work, and encoder-interface checks.
  • Most repaired Fanuc units ship back with parameters and CNC programs intact.
  • Final reinstallation, ladder logic verification, and machine setup stay on your side.
  • Repair backed by a 1-year warranty on parts and workmanship.

More on Fanuc Repair

Related pages and brands

Customers running Fanuc on a CNC machine often have other servo-drive brands on different lines. Pages below cover the broader drive hub and other CNC servo brands the shop services.

Servo drive repair hub

The full range of servo drive and amplifier repair NC Servo handles, across brands.

Allen-Bradley drives

Kinetix, PowerFlex, and 1336 servo drives. Cross-brand option on retrofit projects.

Indramat drives

SERCOS-era TDM, KDS, DDS hardware and current IndraDrive families.

Repair vs replace

When component-level repair makes sense versus buying new or rebuilt.

Fanuc unit down on the machining center?

Give us a call with the Fanuc part number, the alarm code, and a photo of the nameplate if it helps. We will check the shelf, and if we have a rebuilt match you can swap your old one for a discount. If we do not, we can suggest a comparable unit or repair the one you have.

Give Us a Call

FAQ

Common questions about Fanuc repair

A few things customers ask before sending a unit in. Anything not covered, give us a call at 734-326-6666.

Is NC Servo affiliated with FANUC Corporation?

No. NC Servo Technology is an independent, third-party repair facility and is not affiliated with, authorized by, or endorsed by FANUC Corporation. All Fanuc trademarks are the property of their respective owners.

Which Fanuc products do you cover?

Fanuc Alpha series servo amplifiers (Alpha, Alpha-i, Alpha-iA, Alpha-iB), Beta series servo amplifiers (Beta, Beta-i, Beta-iB), spindle drives, Power Supply Modules (PSM), and CNC system control boards from the System 6, 11, 15, 16, 18, 21, 30i, 31i, and 32i families. Send a part number to confirm coverage on anything not listed.

Do you repair Fanuc CNC control boards as well as servo amplifiers?

Yes. CPU boards, I/O boards, power supply boards, and display-interface boards from Fanuc System CNC families come through the bench separately from amplifiers. Component-level repair on each.

Can NC Servo recover CNC programs or ladder logic from a failed Fanuc unit?

Most failures are hardware, and the unit comes back working with its program intact. Corrupted programs are rare; if one is already corrupted before the unit reaches us, that's the one thing we can't recover.

How long does a Fanuc repair take?

It varies. NC Servo is a small independent shop, and lead time depends on the unit, what is wrong with it, and whether parts have to come off a donor unit. Give us a call once the unit ships in, and we can give a current estimate after a tech has looked at it.

What happens if the unit is beyond economic repair?

If the unit is not fixable, we will let you know and help source a replacement: a rebuilt match if we have one on the shelf, or a comparable Fanuc or cross-brand alternative.

What is the warranty on a Fanuc repair?

One year on parts and workmanship for repairs and rebuilt units. Standard exclusions apply for power surges, environmental damage, and software-driven faults.

NC Servo Technology is an independent, third-party repair facility and is not affiliated with, authorized by, or endorsed by FANUC Corporation or any related entities. Fanuc, FANUC, Alpha, Beta, Power Mate, and all other brand names, model numbers, and trademarks referenced on this page are the property of their respective owners and are used solely to identify equipment serviced by NC Servo Technology. NC Servo does not represent that any repair meets FANUC Corporation's proprietary specifications or factory standards. Final installation, parameter loading, system commissioning, and operational compliance remain the responsibility of the customer, OEM, or qualified integrator.

Fanuc Products We Service

93 models available

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FANUC A20B-0009-03201/10D

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FANUC A20B-0009-0150-09B

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FANUC A20B-0009-0150-08B

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FANUC A20B-0009-0150-05B

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FANUC A20B-0009-0150/10B

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FANUC A20B-0009-0150/09B

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FANUC A20B-0009-0150/06B

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FANUC A20B-0009-0140-07C

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View All Fanuc Products

All Fanuc Products

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