Mitsubishi repair · Chicago and Illinois
Mitsubishi CNC, drive and EDM repair in Illinois
Mitsubishi controls run a lot of machines you might not think of as Mitsubishi: many Mazaks, some DMG Mori and Okamoto machines, and plenty of Asian builders. Mitsubishi also builds EDMs, lasers and PLCs. We repair all of it.
- Fastest response available
- Chicago-based
- Stocked repair vans
- Fanuc & Siemens
Fastest response available
Mitsubishi machine down?
Tell us the Mitsubishi model, the control and the alarm. The nearest tech with a stocked van takes the call.
- Talk straight to a tech, not a call center
- The nearest stocked van gets the job
- Fanuc and Siemens controls, and most of the shop floor
Quick answerLocalSpindle repairs Mitsubishi CNC equipment on site across Chicago and Illinois: MELDAS 300, 500 and 600 series and M70, M80 and M800 controls, MDS and MR-J servo and spindle drives, Mitsubishi wire and sinker EDMs, Mitsubishi lasers, and MELSEC PLCs. Call 773-962-0269.
Mitsubishi repair in Illinois
MELDAS, MELSEC and much more
Mitsubishi Electric shows up in Illinois shops in more ways than most people realize. Its CNC controls, from older MELDAS systems to the M70, M700, M80 and M800 series, run Mazak machines (under Mazatrol), many Mori Seiki and DMG Mori machines, and a range of Asian and American machine tools. Its MELSEC PLCs, FR-series VFDs, MR-J servo drives and MELFA robots run packaging lines, assembly cells and custom machines. Mitsubishi EDMs and lasers are common in toolrooms and fab shops.
LocalSpindle techs work on Mitsubishi CNC systems, drives, PLCs, VFDs and servo systems. Because the same company builds all of these, a tech who knows Mitsubishi can follow a problem from the control through the drive to the motor.
Mitsubishi CNC controls
Older MELDAS controls on 1990s and early 2000s machines often have aging power supplies, memory batteries, displays and boards. The M70 and M700 series brought newer hardware on 2000s and 2010s machines, and the M80 and M800 series are on newer machines. Common problems include drive and encoder alarms, battery and absolute position issues, and display and operator panel failures.
We back up parameters, programs and PLC data before working on a Mitsubishi control, and we look for the actual cause of an alarm before replacing expensive electronics.
Drives, motors and encoders
Mitsubishi’s MDS drives on CNC machines and MR-J servo drives in automation equipment are reliable, but they fail when motors, cables or encoders fail, when fans fail and drives overheat, and when mechanical problems overload the motor. We test motors, encoders and cables before replacing drives, and we check cooling and mechanical load.
MELSEC PLCs and automation
On packaging and assembly lines, Mitsubishi MELSEC FX, Q and iQ-R PLCs, GOT HMIs and FR-series VFDs are common, especially on equipment built by Japanese and Asian integrators. When a line stops, we go online with the PLC, find what the line is waiting for, and trace it to the device that’s failing. We back up programs before we touch them.
Where it lives
Mitsubishi systems we work on
| System | Found on | Typical calls |
|---|---|---|
| MELDAS 300 / 500 / 600 | 1990s and 2000s machines | Aging power supplies, screens, batteries and drive faults |
| M70 / M80 / M800 | Current machines from many builders | Servo and spindle alarms, encoder errors, data backup |
| MDS drives and HF/HG motors | Behind Mitsubishi controls | Overcurrent, encoder and power supply faults |
| Mitsubishi wire and sinker EDMs | Mold, die and precision shops | Threading, generator, filtration |
| MELSEC PLCs (FX, Q, iQ-R) | Machines and automation equipment | I/O failures, lost programs, communication |
Two jobs in one call
When a Mitsubishi control sits inside someone else's machine
On a Mazak or another builder’s machine, the Mitsubishi control is the platform and the builder writes its own screens and logic on top. A good diagnosis has to separate the two: is this a Mitsubishi drive fault, or a builder alarm about a switch the ladder is waiting on? We check both before we order anything.
On site
What we do on a Mitsubishi call
- Pull alarm history and drive diagnostics
- Back up parameters and ladder
- Check MDS drive power supplies and DC bus
- Test encoders and cables
- Service EDM filters, threading and generators
- Go online with MELSEC PLCs
Drive alarms
Mitsubishi drive alarms we see
Mitsubishi MDS drives log alarm numbers that point to the fault area.
| Alarm area | What it means | Where we look first |
|---|---|---|
| Overcurrent | The drive saw too much current | Motor and cable insulation, mechanical binding |
| Overvoltage / regen | DC bus voltage too high on deceleration | Regen resistor, power supply, decel settings |
| Encoder errors | Bad feedback from the motor | Encoder cable and connector, then the encoder |
| Power supply alarms | The power supply unit tripped | Incoming power, contactor, the unit itself |
| Overheat | The drive is too hot | Fans, filters, cabinet cooling |
Older MELDAS controls
Keeping MELDAS machines running
Plenty of Illinois machines still run MELDAS 300, 500 and 600 controls. They’re reliable, but they’re old. Screens, power supplies and batteries are the common failures. Before working on any old MELDAS control, we back up its parameters and programs, because those machines often have no other copy.
Parts for older MELDAS hardware are available from rebuilders and the exchange market. We’ll give you the price and lead time before ordering anything.
Newer M70 and M80 controls are straightforward to diagnose. Most of their failures are encoder cables, drive faults and data problems.
Example service call
M70 lathe with encoder alarms on the X axis
The call
A turning shop in Elgin saw intermittent encoder errors on the X axis of a lathe with a Mitsubishi M70 control.
What we did
- Phone. Intermittent encoder errors on one axis usually point to the cable or connector.
- On site. The encoder cable had worn through its jacket in the cable carrier and was getting coolant.
- Fix. Replaced the cable and rerouted it in the carrier.
- Check. Ran the axis through full travel for an hour.
The result. No more encoder errors.
A typical example of how these calls go, written to show our process. It isn’t a specific customer.
Fastest response available
Same trouble with your Mitsubishi?
Call with the Mitsubishi model and the alarm, and a tech will tell you what we’d check first.
- Talk straight to a tech, not a call center
- The nearest stocked van gets the job
- Fanuc and Siemens controls, and most of the shop floor
Yes. See our Mazak page for more on Mazatrol.
Yes, both wire and sinker.
Yes, FX, Q and iQ series.
No. We’re an independent Chicago-based repair company.
Keep reading
Services for Mitsubishi equipment
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Machine down?
Get your Mitsubishi back to cutting
Call with the Mitsubishi model, the alarm and what it was doing. The nearest tech with a stocked van takes it from there.
CNC machine repair, preventive maintenance and machine sales for machine shops and manufacturers across Illinois. Based in Chicago, with techs and stocked repair vans around the state.
Call: 773-962-0269
© 2026 LocalSpindle of Illinois CNC Repair and Maintenance. Less downtime, more cutting.
Chicago, Illinois · 773-962-0269