Servo Drive Repair
Precision servo drive and servo amplifier repair for all major CNC and automation brands — Fanuc, Siemens, Mitsubishi, Yaskawa, Bosch Rexroth and more.
India's trusted servo drive repair specialists. Our axis-level testing with real servo motors, 15,000+ schematic library, and dedicated servo test benches ensure every repaired drive delivers the exact positioning accuracy your machine demands — not approximate results from bench-only testing.
Servo drives are at the heart of precision motion control in CNC machines, robotics, and automated assembly lines. A faulty servo drive can halt an entire production cell and cost thousands per hour in lost output. Synchronics specialises in servo amplifier repair with sub-100ms fault diagnosis using dedicated servo test benches and motor simulators. We repair at the component level — amplifier boards, IGBT/MOSFET power stages, encoder interface circuits, and communication cards — and validate every repair by running the drive with a compatible servo motor under real axis conditions.
What is a Servo Drive?
A servo drive is a precision electronic amplifier that receives command signals from a motion controller and delivers precisely regulated current to a servo motor, enabling accurate control of position, velocity, and torque. Servo drives are essential in CNC machines, robotics, packaging equipment, and semiconductor manufacturing where positioning accuracy of ±0.001mm is required. Common servo drive failures include power stage IGBT faults, encoder feedback errors, and communication bus failures.
Also known as: servo amplifier, servo controller, motion drive
Diagnosis Guide
Common Servo Drive Problems We Fix
Experiencing any of these symptoms? Our engineers have diagnosed and repaired thousands of these faults.
Amplifier Board Failure
Drive shows alarm, no motor rotation, intermittent current spikes, erratic axis movement
IGBT/MOSFET degradation, gate driver IC failure, current sensor drift, thermal stress from prolonged overload
IGBT/MOSFET Blown
Overcurrent alarm at power-up, short circuit trip, fuse blown, no output to motor
Motor winding short, cable insulation failure, mechanical jam causing stall current, voltage transients
Encoder Interface Error
Axis runaway, position drift, feedback alarm, encoder communication fault, incorrect velocity reading
Encoder cable damage, RS-422/RS-485 transceiver failure, signal noise, connector corrosion, encoder supply failure
Communication Card Fault
CNC cannot detect servo axis, communication timeout, intermittent connection drops, ring break alarm
EtherCAT/SSCNET/FSSB transceiver IC failure, optical fibre connector damage, PCB trace crack from vibration
Axis Following Error
Position deviation alarm, axis vibration/oscillation, poor surface finish on machined parts, overshoot
Servo gain mismatch after component drift, encoder feedback degradation, mechanical coupling issue, amplifier response delay
Regenerative Circuit Failure
Overvoltage alarm during deceleration, drive trips when motor brakes, bus voltage spikes above limit
Braking transistor failure, regenerative resistor open circuit, bus voltage detection circuit fault
How It Works
Our Servo Drive Repair Process
A systematic, schematic-driven repair process — from receipt to dispatch.
Receive & Log
Servo drive is received, logged in our ERP system with full photographic documentation, and the reported fault and machine context are recorded for diagnostic reference.
Amplifier & Power Stage Diagnosis
Power stage is tested with isolated supply — IGBT/MOSFET gate characteristics, current sensor outputs, and PWM switching patterns are measured against schematic reference values.
Control & Encoder Interface Test
Control board functionality is verified — DSP/MCU operation, encoder interface communication, and feedback loop integrity are tested with encoder simulators and scope analysis.
Component-Level Repair
Failed components identified during diagnosis are replaced — IGBTs, MOSFETs, gate drivers, encoder transceivers, capacitors — using genuine or equivalent-spec parts.
Axis Test with Servo Motor
Repaired drive is connected to a compatible servo motor and tested under real axis conditions — torque response, velocity tracking, positioning accuracy, and encoder feedback are all validated.
QA Sign-Off & Dispatch
Final QA inspection with thermal imaging under load, test report generated, 6-month warranty certificate issued. Drive is professionally packed and dispatched.
Thorough Inspection
What We Inspect in Every Servo Drive
Every unit goes through a comprehensive inspection checklist before and after repair.
Power Amplifier Stage
Encoder Interface
Communication Module
Control Logic Board
Regenerative Circuit
Cooling System
The Synchronics Advantage
Why Choose Us for Servo Drive Repair
Axis Tuning Expertise
We do not just replace components — we tune the servo loop after every repair. Velocity gains, position loop bandwidth, and torque response are optimised to restore original machine performance.
Servo Motor Pairing Test
Every repaired servo drive is tested with a compatible servo motor, not just on a bench supply. This validates real-world torque delivery, encoder feedback, and dynamic response under actual load conditions.
Schematic-Driven Approach
With access to 15,000+ servo drive schematics across Fanuc, Siemens, Yaskawa, and more, we diagnose faults scientifically rather than swapping boards — ensuring a proper root-cause repair every time.
Troubleshooting
Common Servo Drive Fault Codes We Fix
Seeing one of these error codes? We diagnose and repair the root cause.
General servo alarm — drive has detected a critical fault and stopped the axis
Power stage failure, control board fault, parameter corruption, safety circuit trip
Servo error / deviation — axis position deviates beyond allowable tolerance
Encoder feedback loss, mechanical binding, gain mismatch, motor cable fault
Overcurrent detected in output power stage
IGBT/MOSFET short, motor winding short, cable insulation failure, mechanical jam
Servo drive overheating — internal temperature exceeds safe threshold
Cooling fan failure, blocked heatsink, high ambient temperature, sustained overload
Encoder communication error — feedback signal lost or corrupted
Encoder cable break, RS-422 transceiver failure, connector corrosion, EMI interference
Communication error — CNC/controller cannot communicate with servo axis
Fibre optic fault, EtherCAT transceiver failure, FSSB/SSCNET card fault, cable break
Servo fault codes vary significantly by manufacturer (Fanuc, Siemens, Mitsubishi MR-J, Yaskawa Sigma, etc.). Contact us with your specific servo model and alarm code for expert diagnosis.
Industries Served
Where Servo Drives Are Used
CNC Machining
Spindle servo drives, axis servo amplifiers, tool changers
Packaging & Filling
Carton forming, label applicators, pick-and-place
Robotics & Automation
Industrial robot joint drives, SCARA, articulated arms
Semiconductor & Electronics
Wafer handling, wire bonding, SMT placement
Automotive Assembly
Welding robots, body-in-white, paint line servo systems
Printing & Converting
Web tension control, registration, die cutting servo axes
Trusted Brands
Brands We Service
Component-level repair for all major manufacturers
FAQ
Frequently Asked Questions
Yes. We repair Fanuc servo amplifiers from older 0-series, 10-series, 15-series through to current 30i/31i/32i series. Our team maintains a stock of legacy Fanuc components including hard-to-find IGBT modules and control boards for discontinued models.
Yes. Every repaired servo drive is connected to a compatible servo motor and tested under axis conditions — torque response, velocity tracking, and encoder feedback are all validated. This is critical because bench-only testing cannot reveal axis-level faults like following errors or tuning issues.
We repair communication interface cards for all major protocols — Fanuc FSSB, Mitsubishi SSCNET III, Siemens DRIVE-CLiQ, Beckhoff EtherCAT, and others. We have protocol analysers and test rigs to verify communication at the hardware level.
Absolutely. Many customers send us servo drives with vague symptoms like axis vibration or intermittent alarms. Our diagnostic process starts from fundamentals — power stage, control, encoder, communication — and systematically isolates the root cause regardless of the fault indication.
Yes. All repaired servo drives come with a 6-month written warranty. If the same fault recurs within the warranty period, we repair it free of charge. The warranty covers the repaired components and workmanship.
Servo Drive Repair Services Across India
Synchronics provides expert servo drive and servo amplifier repair services for CNC and automation industries across India — Vadodara, Ahmedabad, Mumbai, Pune, Chennai, Bangalore, Delhi, Kolkata, and all major manufacturing hubs. Our pan-India logistics network ensures your servo drive reaches our facility safely and is returned promptly after repair and axis-level testing.
Whether you have a Fanuc servo amplifier from a VMC, a Siemens S120 from a multi-axis gantry, or a Yaskawa Sigma from a packaging line, our team of 180+ engineers has the expertise, schematics, and test infrastructure to diagnose and repair it at the component level. We service all servo drive brands and test every repair with real servo motors to ensure your machine returns to full production performance.
Get Your Equipment
Back in Action — Fast
Send us your faulty industrial electronics. Our engineers will diagnose it and provide a detailed quote within 24 hours — with no obligation to proceed.
Free Evaluation
No obligation
48hr Turnaround
Fastest in India
6-Month Warranty
Every repair
No Fix, No Charge
Zero risk policy
Pan-India Pickup
Doorstep service