Component-level board work
Capacitors, IGBT modules, gate drivers, voltage regulators, and discrete components. Failed parts replaced individually rather than swapping the whole drive.
Servo Drive Repair Hub
Servo Drive & Amplifier Repair, Component-Level
Independent third-party repair of servo drives, servo amplifiers, motion controllers, and electronic control boards. Power-stage rebuild, IGBT module replacement, DC-bus capacitor service, and feedback-channel verification across 12+ brands. Working on this kind of hardware since 1975.
12+
Drive brands serviced
19,000+
Units in the donor pool
50+
Years on this hardware
1-yr
Warranty on repairs
Drive brands: jump to a dedicated page
Click a brand to skip straight to its repair coverage.
By Drive Type
What “drive repair” covers here
Servo drives, AC drives, and motion controllers all come through the same electronics bench. The work changes depending on what's inside, but every unit is opened, diagnosed, and rebuilt at the component level.
01
Servo drives
Closed-loop servo amplifiers driving servo motors with feedback (resolver, encoder, sin-cos). AKD, BRD, Kinetix, Alpha, IndraDrive families. Bench work: power stage, gate-driver, feedback channel.
02
AC drives & VFDs
Variable frequency drives controlling three-phase induction loads with V/f or vector control. ACS, PowerFlex, TOSVERT families. Bench work: IGBT modules, DC-bus capacitors, control board.
03
Motion controllers
Multi-axis controllers, I/O modules, and communication interfaces. Component-level board repair on controller boards, fieldbus interfaces, and encoder feedback circuits.
04
Amplifiers & power supplies
Linear and switching amplifiers, BRM-P2 power supplies, and Eurocard servo drives. Bench work: capacitor replacement, transistor service, and supply-rail rebuild on legacy DC servo amps.
In the Shop
Drives run under load on the electronics bench
Servo drives, AC drives, and motion controllers come apart at the component level: capacitors, IGBT modules, gate drivers, voltage regulators, and discrete board components. Donor parts come from a 19,000+ unit in-house pool accumulated since 1975.
Each repaired drive runs under representative load on the electronics bench before it ships. Power-stage performance, DC-bus behavior, I/O response, and feedback channel verified against documented procedures.
What NC Servo Does
Six lanes of drive work
Whether the drive is a 1980s Eurocard analog servo amp or a current ACS880 with fieldbus, the path through the electronics bench is the same.
Power-stage rebuild
Blown IGBT module replacement, gate-driver circuit verification, and DC-bus capacitor service on long-running ACS, PowerFlex, BRD, and Alpha frames.
Feedback & communication
Encoder, resolver, and sin-cos feedback channel verification. Fieldbus interface checks (PROFIBUS, EtherCAT, Modbus) and fiber-optic link testing on modular drives.
Donor parts service
19,000+ unit in-house pool. When the OEM no longer stocks parts for older drives, the shop pulls from donor units that come through.
Rebuilt swap-with-discount
If a rebuilt match is on the shelf, customers can trade in the failed drive for a discount on the rebuilt one already on hand.
Cross-brand sourcing
If your drive is beyond economic repair and not on the shelf, we suggest a comparable cross-brand option that drops in.
Where Drives Show Up
Industries the bench has seen
Servo drives and AC drives sit on every kind of automated machine. The shop has worked across these application contexts since 1975.
Machine tool & CNC
Fanuc Alpha and Beta amplifiers, Allen-Bradley Kinetix, and Indramat drives on machining centers and grinders.
Injection molding
Closed-loop servo drives on injection units, clamp servos, and ejector control on molding machines.
Robotics & automation
Multi-axis servo drives and motion controllers on robotic cells, pick-and-place lines, and indexers.
Steel mill & paper
High-power AC drives and DC drives on rolling mills, paper machines, and mill-duty applications.
Process & pumping
VFDs on pumps, fans, compressors, and process equipment in chemical, water, and oil-and-gas plants.
Packaging
Servo drives on filling, capping, labeling, and case-packing equipment across food, beverage, and consumer goods.
Printing & converting
Multi-axis servo drives on web-fed printing presses, laminators, and converting lines.
Power & energy
Drives on power generation, wind turbine pitch control, and energy distribution applications.
Coverage
Drive brands with dedicated repair pages
Each brand below has a dedicated page covering the specific models, common failures, and repair scope for that drive line. Send a model number for any brand that's not listed and we can confirm coverage.
Workflow
From model number to ship-back
Same four-step path through the shop whether the drive is a 1980s Eurocard servo amp or a current ACS880 with EtherCAT.
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01
Get in touch
Phone or email with the model number, frame size, kW or HP rating, and the fault code if the display still reads.
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02
Bench review
Tech opens the drive, inspects power stage and control boards, and runs it under load on the electronics bench.
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03
Cost & approval
We call back with the cost and a rough turnaround. Nothing is started without your sign-off.
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04
Repair, test, ship
Failed components replaced from inventory or off donors, the drive verified under load, and shipped back.
FAQ
Common questions about drive repair
Category-level questions. For brand-specific FAQs, see the dedicated brand page in the directory at the top of this page.
What is the difference between a servo drive, an AC drive, and a VFD?
A servo drive is a closed-loop amplifier that controls a servo motor with feedback (resolver, encoder, or sin-cos). An AC drive or VFD (variable frequency drive) controls three-phase induction loads with open-loop V/f or vector control. Both come through the bench, but the repair work is different: VFD work is mostly power-stage and DC-bus, servo-drive work adds feedback-channel diagnostics.
Can NC Servo recover programs or parameters from a failed drive?
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.
Do you only service the brands listed in the directory?
The brands in the directory each have a dedicated page, but the shop has touched many more drive brands over the years. Send a model number for anything not listed and we can confirm coverage.
What happens if my drive is beyond economic repair?
If the drive 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 cross-brand alternative.
Do you handle CANbus, PROFIBUS, and EtherCAT drives?
Yes. Drives with integrated digital protocol electronics come through the bench alongside legacy analog hardware. We have the equipment and experience to verify fieldbus interfaces, fiber-optic links, and feedback channels on modern drives.
What is the warranty?
One year on parts and workmanship for repairs and rebuilt units. Standard exclusions apply for line-side faults, improper installation, and out-of-spec operation. Verifying line voltage, supply protection, and load matching before powering up a repaired drive is recommended.
Do you sell rebuilt drives outright?
Yes. If we have a rebuilt match on the shelf, you can buy it outright or trade in your failed drive for a discount on the rebuilt one. Stock is hit or miss; give us a call with a specific model number.
More from NC Servo
Other repair hubs and resources
If your hardware is on the valve side, an industry-specific machine, or you want technical reading, the pages below cover those angles.
Valve repair hub
Servo and proportional valve repair across 20+ brands. Component-level rebuild, bench testing, donor parts pool.
Industrial valve repair
How heavy-industrial hydraulic valve work fits into the broader shop services.
Injection molding
Servo valve and drive repair specifically off injection molding machines.
Repair vs replace
When component-level repair makes sense versus buying new or rebuilt.
What is a servo drive?
Plain-language explanation of servo drives: what is inside, common architectures, and what gets done at the bench.
Servo valve failure causes
Contamination, hardened seals, blown coils, and the most common reasons servo valves fail.
How to test a servo valve
Bench testing workflow for closed-loop valve hardware: flow, null, leakage, and step response.
What is a servo valve?
Plain-English explainer on what's inside an electrohydraulic servo valve, useful context for drive-and-valve servo systems.
Send a model number, we'll check the shelf
Give us a call or send a model number with frame size and fault code. 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.
Get Your Free Quote
Fill out the form below and we'll get back to you within 24 hours with a detailed repair quote.