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Okuma CNC Replacement & Overhaul
Full module rebuild for control boards and drive units — replacing defective parts and every common wear item along the way, tested in two stages before it ships back.
Photo coming soon
What Is Okuma CNC Replacement & Overhaul?
A targeted repair fixes today's fault. An overhaul goes further: we open the module, replace the component that actually failed, and also replace the parts that are known to fail next — aging electrolytic capacitors, worn connectors, tired cooling fans — even though they haven't failed yet. The goal isn't just getting the unit working again; it's sending back a module that isn't going to be back on our bench in six months for a different reason.
This matters most on units that have been in service a long time, units that have already failed more than once, or units you want rebuilt and kept as a ready spare rather than repaired reactively after the next breakdown. Okuma itself runs an official Certified Exchange Parts program through its Mechanical and Electrical Exchange Divisions, refurbishing spindles, drives, boards and power supplies with OEM parts for customers who go through an authorized distributor. We are not part of that program — we're an independent alternative, offering a similar full-rebuild philosophy at component level, including on older generations that Okuma's own exchange stock may no longer cover.
We are an independent repair company. We are not an authorized Okuma dealer, distributor or service partner — we rebuild and repair Okuma CNC electronics on customer-owned equipment.
Overhaul is a deliberate choice, not our default. For a straightforward single-fault repair, see CNC Control Repair or Drive Units Repair instead — we'll tell you honestly which approach fits your situation and budget.
Diagnosis at a Glance
A quick way to check whether a full overhaul makes more sense for your unit than a single targeted repair, and what each option actually covers.
Signs You Need This Service
Any of these usually mean a full rebuild makes more sense than a single-fault repair.
- Same module has already failed more than once
- Unit has been in service for many years
- Want a rebuilt unit kept in-house as a ready spare
- Planning downtime around a scheduled overhaul, not a breakdown
- Module runs a mission-critical machine you can't afford surprises on
- Prefer to pay once rather than repeatedly over a few years
What We Rebuild
Full-module overhaul across the electronics that keep production running.
- OSP control boards and I/O modules
- VAC, MIV, MFU and BLD drive units
- Power supply modules
- Resolvers and feedback modules
- Operator panels and displays
- Communication and interface modules
Overhauls cover modules across every OSP generation — from legacy floppy-disk-era controls through the current OSP-P500. See our OSP controls guide for generation-specific detail.
What This Overhaul Covers
The parts we address as standard, beyond the fault that brought the unit in, so the module that ships back is genuinely ready for years of service, not just today.
Full Disassembly & Inspection
Every board and connection inspected, not just the area near the reported fault.
Preventive Capacitor Replacement
Every electrolytic capacitor replaced as standard, not just the ones that have already failed.
Connector & Interface Refresh
Worn connectors and interface points replaced before they become the next fault.
Cooling Fan Replacement
Fans replaced proactively — a seized fan is one of the most common causes of a repeat failure.
Two-Stage Load Testing
Safe low-power testing first, then full-load testing on dedicated test stands before shipment.
Final Calibration & Report
Calibrated and documented, so you know exactly what was replaced and why.
Our Two-Stage Testing Process
Stage one runs the rebuilt unit under safe, controlled conditions — galvanic isolation and limited supply power — to catch any gross fault before it's ever connected to a real motor or load. This is the same cautious first step used across the industry precisely because it protects both the unit and the equipment it will eventually run on.
Stage two is full-load testing on dedicated test stands, matched to the specific drive and feedback type — different encoder types need different test setups to genuinely simulate real operating conditions. Only once a unit passes both stages does it get calibrated, documented and shipped.
This two-stage approach takes longer than a single functional check, and that's deliberate. An overhaul is meant to be the last repair a module needs for a long time, not just the next one.
Photo coming soon
What Makes Our Overhaul Different
A few things that shape how we approach every full rebuild, whether it's a unit that already failed twice or a healthy spare being rebuilt ahead of time.
Beyond the Reported Fault
We inspect and address the whole module, not just the area the symptom pointed to.
Preventive by Default
Capacitors, fans and connectors replaced as standard, not only once they've already failed.
Honest About Fit
If a simple targeted repair genuinely fits your situation better, we'll say so instead of upselling an overhaul.
OSP Controls We Overhaul
Board layouts and common wear points differ meaningfully between generations. Find your specific generation below.
OSP-3000
Legacy LC series — tape and floppy-disk era controls.
OSP-5000LB/LC series — floppy disk and bubble memory era.
OSP-7000Cadet/Crown/early LB — full-size CRT-era displays.
OSP-U100LU/MX-V/MC-V/MA-V — transitional floppy-to-CF generation.
OSP-E100Last pre-THINC generation — no USB or Ethernet.
OSP-P100First P-series — open-architecture Windows-based control.
OSP-P200THINC-OSP global rollout — API and networking introduced.
OSP-P300Shared database, touchscreen — most common current-era control.
OSP-P500Current generation — Digital Twin, dual-core processing.
Okuma Models We Support
Overhaul is control-generation-specific rather than machine-model-specific. Here are the model families we see most often.
LB & GENOS L
Lathes for shafts, gears and turned components.
GENOS M / MB & MAMachining centers for milled and prismatic parts.
MULTUS Mill-TurnMultitasking platforms machining complex parts in one setup.
MU-Series 5-AxisFive-axis centers for complex geometry and tight tolerances.
MCR Double-ColumnLarge-part machines for big, rigid workpieces.
MA-H HorizontalHorizontal centers built for long unattended runs.
Other Ways We Can Help
A full overhaul is one option among several — here's the rest of the site if a lighter-touch approach fits better.
CNC Control Repair
A focused repair for one specific fault, without a full module rebuild.
Drive Units Repair
Component-level repair for VAC, MIV, MFU and BLD servo and spindle drives.
Testing & Diagnostics
Not sure what's wrong yet? Start here with a proper diagnostic pass.
Every Component We Repair
Browse the complete catalog of boards, drives and modules we repair.
Spare Electronics
Tested, already-rebuilt spare units ready to ship when a fast swap beats a repair wait.
Industries We Serve
Automotive, aerospace, medical, defense and more — see how we support your sector.
Countries We Serve
See every country where we currently offer on-site technician visits.
All Services
Browse every repair and support service we offer, all in one place.
How This Overhaul Works
Three steps from a worn module to a fully rebuilt, tested one.
01
Send the Unit
Machine model, module details and history — including any previous repairs.
02
Full Rebuild
Disassembly, repair, and preventive replacement of known wear items.
03
Two-Stage Test & Return
Low-power then full-load testing, calibration, and shipped back documented.
Frequently Asked Questions
No. We are an independent repair company, not an authorized Okuma dealer, distributor or service partner, and not part of Okuma's own Certified Exchange Parts program. We rebuild and repair Okuma CNC electronics on customer-owned equipment.
A normal repair fixes the specific fault you sent the unit in for. An overhaul fixes that fault and also proactively replaces the parts most likely to fail next — capacitors, fans, connectors — even if they haven't failed yet. It costs more upfront but is meant to be the last repair the module needs for a long stretch.
Tell us the unit's age, history and how critical it is to your production, and we'll give you an honest recommendation. If a targeted repair genuinely fits better, we'll say so rather than push the more expensive option.
Yes — this is a common request from customers running mission-critical machines who want a rebuilt, tested spare on the shelf rather than waiting for a breakdown. Send us the working unit and we'll rebuild it the same way.
Longer than a targeted repair, since it includes full disassembly, preventive component replacement and two-stage testing. We'll give you a realistic timeline once we know the module and its condition.
Contact
Send us your module details — here's how to reach us directly.
Ready for a Full Rebuild? Tell Us About Your Unit
Module details, age and history — we'll tell you honestly whether an overhaul or a targeted repair fits your situation better.
