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FANUC Servo Amplifier Repair Services

FANUC Servo Amplifier/Drive Repairs

Nationwide FANUC Servo Repair Services

Tri Star CNC Services provides quick and affordable repair on servo amp component-level parts when a servo amplifier (also called a servo drive) fails. We offer servo amp repairs, refurbished servo amp replacements and field service across the country. If you discover issues with your servo amplifier, call us right away to discuss your options.

Trust Tri Star CNC Services to expertly repair, restore or replace:

  • AC Analog
  • FANUC Alpha, Alpha i series & Alpha is series
  • FANUC AC Digital Series (S, C & D)
  • FANUC DC and DCM Series
  • Beta, Beta i, Beta is series
Free Phone Support Contact Tri Star
⚠ Troubleshooting alarm codes? See our FANUC servo alarm code list.


We provide free phone support to help you determine whether your servo amplifier is malfunctioning and needs repair. Our technicians have extensive experience repairing and refurbishing FANUC Servo drives. We maintain a well-stocked inventory of parts necessary for overhauling these devices, so you won't have to wait long before we return a working, fully refurbished part.

Refurbished FANUC servo amplifiers

Buy A Used FANUC Servo Drive

We work with a wide variety of parts for FANUC-GE and FANUC-CNC parts, shipped fast nationwide. If your FANUC servo drive cannot be repaired, we offer great prices on refurbished FANUC servo amplifiers. All units are thoroughly cleaned and load tested before they are sent back. If you are experiencing any issues with your CNC machining and suspect an issue with electronic components, contact us today.

Search FANUC Parts Number:

Browse FANUC Parts Database

Common FANUC servo parts numbers for repairs or replacements:

FANUC CNC parts alarm codes

Servo Amp Alarms

Spindle Amplifier Alarms

Power Supply Alarms

SVPM Alarms

Overtravel Alarms

Overheat Alarms

System Alarms

Servo amplifier failure can occur for a number of reasons. The list of possible problems can be overwhelming - even the most detailed explanation in a manual can be intimidating. If you’re having trouble diagnosing or navigating your machine’s symptoms, Tri Star CNC provides free over-the-phone guidance from experts to help you through it.

FANUC Servo Amplifier Repair

How Does Tri Star CNC’s Repair Process Work?

  1. Contact us online or call us at 815-578-9145 for FREE troubleshooting assistance.
  2. Once the problem is diagnosed, fill out an RMA form for repairs. New customers will also need to submit a new customer form and credit application.
  3. Ship the part out to Tri Star.
  4. Tri Star receives, repairs, cleans and ships back the part, typically in 3 to 5 days.

Tri Star CNC representatives will remain in touch with you, providing updates throughout the entire process.

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Symptoms of a malfunctioning servo amplifier

Since servo amplifiers are so important in FANUC machinery, you'll usually notice when they are malfunctioning. If maintained, an axis’s control, motor and drive work together with precision and accuracy. When they fail, axes frequently exhibit these errors, among others:

If you notice these issues, call Tri Star CNC for FREE phone support troubleshooting.


How a Servo Drive Works

A servo drive takes the command signal sent from a control panel and amplifies the low-power signal up to a level that powers the movement of a servo motor. As the servo motor is activated, a sensor reports the status of the motor to the servo drive via a feedback signal. The control compares what the motor is doing with the command it received and alters the voltage frequency going to the motor in order to correct any deviation from the original command.

For more specific information regarding the operation of servo drives, consult our guide on how servo drives work or contact our experienced professionals at Tri Star CNC at 815-578-9145.

What is a FANUC servo amplifier?

A FANUC servo amplifier is a CNC machine part. It takes the command signal from a control panel and amplifies the low-power signal up to a level that powers the movement of a servo motor.

How do you test a FANUC servo drive?

Set the meter to ohms and test T1 to T2, T2 to T3 and T1 to T3. The range should be between 0.3 and 2.0 ohms with the average being 0.8 ohms. If you get a zero, there is a short between the two phases. If you get an exceptionally high or infinite reading, there is an opening between the two phases. For free over-the-phone FANUC servo drive troubleshooting, call Tri Star CNC Services, LLC at 815-578-9145.

What are signs that your servo amplifier is broken?

Signs that your servo amplifier is broken include:

  • Erratic rotation and vibration
  • Failure of detection circuits
  • Blown fuses
  • Occurrence of OVC and HC alarms

What is the cost of FANUC servo amplifier repair?

The average cost of FANUC servo amplifier repair is $1,788.82 with the maximum repair cost being $9,725.00 and the minimum repair cost being $679.00. Search our parts database to get an up-to-date repair pricing quote for your part.

What is the cost of FANUC servo amplifier exchange?

The average FANUC servo amplifier exchange cost is $2,161.77 with the maximum exchange cost being $10,265.00 and the minimum exchange cost being $879.00. Search our parts database to get an up-to-date exchange pricing quote for your part.


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