If SRVO-069 (Pulse Coder Alarm) appears, try these immediate actions:
These steps may resolve temporary encoder communication issues.
FANUC Alarm SRVO-069 (Pulse Coder Alarm) occurs when the system detects a fault in the encoder (pulse coder) feedback signal.
The pulse coder is responsible for:
When this feedback becomes invalid or lost, the robot stops to prevent positioning errors.
SRVO-069 indicates that the controller cannot properly read or interpret the encoder signal.
This typically means:
The encoder itself may be defective or degraded.
Common issues include:
Encoder failure often requires motor replacement.
Cable issues are one of the most frequent causes.
Common issues include:
Signal transmission can fail due to poor connections.
Common issues include:
The amplifier processes encoder data before sending it to the controller.
Common issues include:
External interference can disrupt encoder signals.
The following components are commonly required when resolving SRVO-069 alarms:
Browse available FANUC spare parts at inrobots.shop for fast replacement and global delivery.
Here’s a fast way to identify the root cause of SRVO-069:
Why it works:
Signal cables are often the most failure-prone component in industrial environments due to constant movement, bending stress, and electrical interference. Even if no visible damage is visible, internal wire breakage or shielding degradation can lead to intermittent feedback loss.
Next step:
If swapping the cables changes the alarm behavior, it’s recommended to replace the signal cable with a high-reliability industrial-grade cable to ensure stable encoder communication.
For a reliable solution, check out our FANUC Signal Cables designed for long-lasting performance in high-demand automation settings.
SRVO-069 is a critical feedback-related alarm:
Operating without stable encoder signals can result in position loss and unsafe robot motion.
These alarms are often related to encoder or feedback system issues.
It is the encoder that provides position feedback for each servo motor.
Common causes include encoder failure, cable damage, connection issues, or amplifier faults.
Only if the issue is temporary. Persistent alarms require immediate troubleshooting.
Yes, it directly affects position feedback and robot accuracy.
Explore the Full Guide: Industrial Robot Fault Codes Library → Fanuc Alarm Codes
Explore the complete guide for troubleshooting, repair strategies, and component replacement across industrial robot systems.
Key components commonly involved in fanuc alarm troubleshooting issues and replacements.
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