Mitsubishi · Drives
MR-J2S-100A — MELSERVO-J2-Super servo amplifier: fault codes, repair & supply
The MR-J2S-100A is a Mitsubishi MELSERVO-J2-Super general-purpose servo amplifier, a legacy product still found on many machines. Star Automations sources and supplies the MR-J2S-100A and repairs failed units at component level, so you can choose between a replacement and getting your existing unit restored. This is a discontinued OEM line. We source it from global surplus, and advance payment secures your delivery slot. Most quotes come back the same day — send the part number or the fault code on WhatsApp.
Common MELSERVO MR-J2S fault codes and what we usually find
Fault code wording can differ by firmware and manual revision — always confirm against the manual for your exact unit. The causes below are typical findings, not a diagnosis of your specific unit.
| Code | Meaning | Typical cause |
|---|---|---|
| 10 | Undervoltage | Low or dropped supply, loose terminal |
| 12 | Memory error 1 (RAM) | Failed control board |
| 13 | Clock error | Failed control board |
| 15 | Memory error 2 (EEP-ROM) | Failed control board or write fault |
| 16 | Encoder error 1 | Encoder cable, connector or encoder fault |
| 17 | Board error | Failed control board or power stage |
| 19 | Memory error 3 (flash ROM) | Failed control board |
| 1A | Motor combination error | Wrong motor or amplifier pairing |
| 20 | Encoder error 2 | Encoder cable or encoder failure |
| 24 | Main circuit error (ground fault) | Motor winding or cable short to ground |
| 25 | Absolute position erase | Encoder battery low or cable break |
| 30 | Regenerative error | Failed regenerative resistor or transistor |
| 31 | Overspeed | Tuning, encoder or command problem |
| 32 | Overcurrent | Failed power stage or motor short |
| 33 | Overvoltage | Failed regeneration, high supply |
| 45 | Main circuit device overheat | Blocked airflow, failed fan |
| 46 | Servo motor overheat | Overload, motor thermistor or cable |
| 50 | Overload 1 | Sustained overload, brake dragging |
| 51 | Overload 2 | Peak load, mechanical jam |
| 52 | Error excessive | Axis blocked, tuning or encoder problem |
| 8E | Communication error | Cable or CNC link fault |
| 88 | Watchdog | Failed control board |
When a MR-J2S-100A needs attention
- Alarm shown on the amplifier display at power-on
- Alarm 16 or 20 after cable or motor work
- Overheat or fan noise
- Burnt smell or damaged power stage
- Axis tripping under load
Replace or repair your MR-J2S-100A
Source a replacement
Send the part number. We check sourcing from global surplus and the OEM channel and reply the same day with availability, condition and price. Advance or verified escrow applies.
Repair your existing unit
If sourcing takes longer or you want to keep your configuration, we repair at component level — power stage, gate-drive, control and supply sections — and test before dispatch.
What people look up for the MR-J2S-100A
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MR-J2S-100A — common questions
Can you supply the MR-J2S-100A in India?
Can a faulty MR-J2S-100A be repaired instead of replaced?
My MR-J2S-100A shows 10 (undervoltage). What should I do?
Is the exact part number important?
Need the MR-J2S-100A now?
Send the part number or fault code — we reply the same day. Serving Chennai, Puducherry, Bengaluru, Hyderabad, Delhi and pan-India.