Fanuc Amplifier Modules
Fanuc manuals refer to servo and spindle drives as amplifiers and give each amplifier type its own module name. A typical Alpha series stack pairs a power supply module with a spindle amplifier module and one or more servo amplifier modules. The power supply module feeds main power and control power to the other modules from the three-phase input.
Some Beta series machines use a single SVPM unit in place of separate modules. Each module carries an A06B part number on its label. The module name and that part number give a repair shop the starting point for a quote.
Fanuc Drive and Amplifier Repair Shops
CNC Electronics Inc
Charlottesville, VA
Brands: Fanuc
CNC Service Group
Medina, OH
Brands: Fanuc
Global Electronic Services
Buford, GA
Brands: Fanuc, Haas, Okuma
Lakeside CNC Electronics
Addison, IL
Brands: Fanuc
Machine Tool Science
Gaffney, SC
Brands: DMG Mori, Fanuc, Haas, Mazak, Okuma
Northline Industrial
Redford, MI
Brands: Fanuc, Makino, Okuma
Repair Zone
Bay City, MI
Brands: Fanuc
T.I.E. Industrial (FanucWorld)
La Vergne, TN
Brands: Fanuc, Okuma
Tri Star CNC Services, LLC
McHenry, IL
Brands: Fanuc
Compare Fanuc Drive and Amplifier Repair Shops
This table lists turnaround, warranty, and evaluation terms from each shop's published information.
| Shop | Repair type | Turnaround (business days) | Warranty (months) | Free evaluation | Rush service |
|---|---|---|---|---|---|
| CNC Electronics Inc | Ship-in repair | Not listed | 12 | Not listed | Not listed |
| Global Electronic Services | Ship-in repair | 3-5 | 24 | Yes | Yes |
| Lakeside CNC Electronics | Ship-in repair | 2-3 | 12 | Yes | Yes |
| Northline Industrial | Ship-in and on-site | Not listed | 12 | Yes | Not listed |
| Repair Zone | Ship-in repair | Not listed | 12 | Not listed | Yes |
| T.I.E. Industrial (FanucWorld) | Ship-in repair | Not listed | 12 | Not listed | Not listed |
| Tri Star CNC Services, LLC | Ship-in and on-site | Not listed | 12 | Not listed | Not listed |
Common Amplifier Failures
IGBT failure in Alpha i servo amplifiers ranks among the most common faults on high-cycle machining centers. Spindle amplifiers on high-cycle spindle applications see the same IGBT and gate driver failures. On SPM-2.2i through SPM-11i units an IPM alarm points to excessive load or overcurrent detected by the power module.
An amplifier alarm does not always start with a fault inside the amplifier and can point back to the motor or cable. The SPM alarm list names a power lead shorted to ground and a motor winding shorted to ground among the causes. A ground check on the motor and the power cable belongs ahead of any amplifier repair or exchange.
Reading Fanuc Amplifier Alarms
A Fanuc amplifier shows its alarm code on the LED display of the module in the electrical cabinet. The CNC screen shows the same fault with an alarm number and a short description. Alarm 607 on a 0i Mate-MC typically points to a missing AC phase at the power supply module and not to the servo amplifiers.
On Alpha servo amplifier modules the alarm number points to one axis with alarm 8 for the L axis and alarm 9 for the M axis. The axis letter narrows the check down to one motor and one cable on a two-axis or three-axis module. Mechanical binding on the axis can trigger the same alarms and deserves a check ahead of any work on the amplifier.
Component-Level Amplifier Repair
Component-level repair replaces the failed parts on the amplifier in place of a full module swap. On Alpha i and Beta i amplifiers the repair targets individual IGBTs, gate drivers, and power supply module capacitors. Some shops diagnose and document the root cause ahead of the repair.
Full functional testing of the amplifier follows the component repair at some shops. Component-level repair on a spindle amplifier module aims to restore full spindle performance and cycle rates. Test methods and warranty terms differ from shop to shop and belong on the list of questions for a repair quote.
Spares and Shipping
The control and the amplifiers on a Fanuc machine work as one system and depend on each other. Repair specialists recommend spare servo and spindle amplifiers in the same inventory plan as the spare control boards. A repaired and tested spare offers more certainty than a salvage pull with no test record.
Fanuc amplifier stacks carry high DC bus voltage and need full isolation and a full discharge ahead of removal or diagnosis. Photos of the alarm screen and a list of the alarm codes taken ahead of any reset give the repair shop the fault history. Each shop sets its own shipping and packing instructions for amplifier modules.