Mitsubishi Electric Repair
The MR-J2S servo line alone runs an enormous installed base of Mazak-era CNC machines and general automation — obsolete, but with predictable failures that repair cleanly. We also service MR-J3/J4, MDS CNC drives, GOT operator terminals, and FR-series VFDs.
Independent repair — not Mitsubishi Electric-affiliated
Mitsubishi Electric repair services
Mitsubishi Electric
$449Mitsubishi GOT Repair
GOT1000 support ends in 2027 and replacements mean rework — repair keeps your exact unit running. Flat $449.
3–5 business days in lab · Buy online now →
Mitsubishi Electric
Free evaluationMitsubishi Servo Amplifier Repair
MR-J2S amps run half the CNC world and fail the same way — a blown IPM. Free evaluation; typical repairs $450–$950.
3–5 business days in lab · Free evaluation →
Product families we service
MR-J2S servo amplifiers
The classic IPM failure — bread-and-butter repair
MR-J3 / MR-J4
Current and recent generations
MDS series CNC drives
Mazak and Mitsubishi CNC machines
GOT1000 / GOT2000 HMIs
GOT1000 OEM service ends 2027 — repair continues
FR-series VFDs
Small frames up to 25 HP
Categories: Servo Drives · HMI / Touchscreens · VFDs / AC Drives · CNC Electronics
What fails on Mitsubishi Electric hardware
Across the Mitsubishi Electric equipment that reaches our bench, a handful of faults account for most of it. Electronics age in fairly predictable ways, which is exactly why board-level repair works.
Mitsubishi GOT Repair
Backlight failure
What you see: Screen goes dark while the terminal continues running normally.
Why: Backlight assemblies wear out with hours in service. On a GOT the underlying display and video path typically remain fine, which is why a faint visible image is such a reliable diagnostic.
Mitsubishi Servo Amplifier Repair
Power module failure
What you see: Overcurrent alarms, or a drive that trips immediately when enabled.
Why: The power stage fails short, typically as a consequence of a shorted motor winding or a damaged motor cable rather than on its own. The downstream fault must be found or the repaired drive will fail again.
Before you ship a Mitsubishi Electric unit
- □Confirm the supply feeding the terminal is actually delivering its rated voltage under load — a failing panel supply mimics a dead HMI exactly.
- □Shine a bright light at an angle across a dark screen. If you can make out the application faintly, the LCD is alive and you have a backlight fault, which is a cheaper and faster repair.
- □If the unit boots but the touch is wrong only in one region, note where. Localized dead zones point at digitizer wear; whole-screen drift more often points at the controller.
- □Note the exact text of any boot or fatal error. The code narrows the fault far faster than "it will not start".
- □Back up your runtime application if you have a copy — we preserve what is on the unit, but a backup is cheap insurance on any repair.
Repair or replace?
Operator terminals are the clearest repair-over-replace case in a plant. Much of the installed base is discontinued with no drop-in successor, so replacing means specifying new hardware, re-developing or converting the application, re-testing it against live machinery, and retraining operators on a screen that behaves differently. The repaired terminal drops back into the same panel cutout running the same application. Even where a successor exists, the migration engineering usually costs several times the repair.
Mitsubishi Electric part numbers
Control Board Lab is an independent industrial electronics repair company. We are not affiliated with, endorsed by, or an authorized service center for Allen-Bradley®, Rockwell Automation®, Siemens®, FANUC®, Mitsubishi Electric®, Yaskawa®, ABB®, Schneider Electric®, Pro-face®, Omron®, or any other manufacturer named on this site. All trademarks belong to their respective owners and are used for identification only.
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Call (817) 799-7332 · 📱 Text us a photo of your unit · Email repairs@controlboardlab.com