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Fanuc alarm

SP9073 Spindle Motor Sensor Disconnected

The spindle amplifier lost the signal from the motor's speed sensor.

Stops the machineFanuc 0i, 16i/18i/21i and 30i/31i/32i controls

What it means

The spindle amplifier lost the signal from the motor's speed sensor. Spindle amplifier alarm 73.

Common causes

  • Sensor cable unplugged or damaged
  • Coolant in the sensor connector
  • Sensor gap out of adjustment or sensor failed

What to check first

  1. Check the sensor cable from the motor to the amplifier
  2. Look for coolant at the connectors

Lock out the machine before reaching into it. Never bypass a door switch or interlock to clear an alarm.

When to call a repair tech

Sensor gap setting and replacement are tech jobs.

Repair companies that work on Fanuc

See all Fanuc repair

Verified repair company

Allied MachineX

Emergency service

CNC, press brake and full machine repair across Illinois and Wisconsin

  • Plainfield, IL
  • Comes to your shop
DMG MoriDoosanFanucHaasHurcoMazakOkuma

Alignment & Laser Calibration · Control & Electronics Repair · Crash Recovery · Hydraulics & Lubrication · Machine Moving & Installation · Press Brake & Fab Equipment

(844) 763-1748 Website Details
Verified repair company

LocalSpindle of Illinois

Emergency service

On-site CNC and plant equipment repair across Illinois, with 30+ years of tech experience

  • Chicago, IL
  • Comes to your shop
  • In-house rebuild shop
DMG MoriDoosanFanucHaasHeidenhainHurcoMakinoMazak+3

Control & Electronics Repair · Crash Recovery · Hydraulics & Lubrication · Press Brake & Fab Equipment · Preventive Maintenance · Retrofits & Control Upgrades

(773) 692-0269 Website Details
Verified repair company

LocalSpindle of Wisconsin

Emergency service

Wisconsin-owned CNC repair with teams in Milwaukee, Madison and Green Bay

  • Milwaukee, WI
  • Comes to your shop
  • In-house rebuild shop
DMG MoriDoosanFanucHaasHardingeHeidenhainHurcoMakino+4

Control & Electronics Repair · Crash Recovery · Hydraulics & Lubrication · Press Brake & Fab Equipment · Preventive Maintenance · Retrofits & Control Upgrades

(414) 381-0127 Website Details

Quick answers

What does Fanuc alarm SP9073 mean?

The spindle amplifier lost the signal from the motor's speed sensor. Spindle amplifier alarm 73.

What causes Fanuc alarm SP9073?

Sensor cable unplugged or damaged. Coolant in the sensor connector. Sensor gap out of adjustment or sensor failed.

How do I fix Fanuc alarm SP9073?

Check the sensor cable from the motor to the amplifier. Look for coolant at the connectors. Sensor gap setting and replacement are tech jobs.

Alarm numbers and text can differ by control model, software version and machine builder. This page is a starting point from people who have worked on these machines, not a replacement for your machine builder's manual.

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