What causes FANUC alarm 913?

Machine system or function indicated by the alarm name has detected a fault. Control parameter or configuration error related to the alarm condition. Hardware component fault on the CNC or machine. Part program error or illegal operation for the indicated function. Machine interlock or safety condition not satisfied.

How do I fix FANUC alarm 913?

1. Note the alarm number and check the Fanuc alarm screen for any sub-code or additional details. 2. Identify the specific machine system or function from the alarm name. 3. Power cycle the machine to clear transient faults. 4. Consult the Fanuc parameter or operator manual for alarm 913 specific remedy. 5. Contact Fanuc service if the alarm persists after basic troubleshooting.

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FANUC Controller

System · Intermediate · 30-60 minutes

Alarm 913

Fanuc Alarm 913 - DRAM PARITY: BYTE 1

Alarm 913 DRAM PARITY: BYTE 1 indicates a hardware failure in the main CPU board's dynamic RAM (DRAM) memory chip responsible for byte 1 data storage. This is a critical hardware fault caused by defective DRAM chips, loose board connections, or electrical damage to the main PCB. The parity check circuit has detected data corruption in the memory subsystem.

FANUCSystemIntermediate30-60 minutes

913

Fanuc Alarm 913 - DRAM PARITY: BYTE 1

SYSTEM ALARM 913

Root Cause Summary

Alarm 913 DRAM PARITY: BYTE 1 indicates a hardware failure in the main CPU board's dynamic RAM (DRAM) memory chip responsible for byte 1 data storage. This is a critical hardware fault caused by defective DRAM chips, loose board connections, or electrical damage to the main PCB. The parity check circuit has detected data corruption in the memory subsystem.

Causes and Fixes

1
Power OFF the CNC completely. Wait 30 seconds, then power ON to clear transient memory states and verify if alarm persists immediately after boot.
If alarm reappears immediately on every power cycle, main CPU board replacement is required.
2
Access SYSTEM > MAINTENANCE > BOARD CHECK screen to view hardware diagnostic results. Record any additional error codes or memory test failures displayed.
3
Contact Fanuc service for main CPU board replacement. Provide control model (0i-MD, 31i-B5, etc.) and full serial number from SYSTEM > CNC ID screen for correct board identification.
DRAM is soldered to main board - individual chip replacement requires factory-level BGA rework and is not field-serviceable.
4
Before board replacement, backup all parameters using SYSTEM > PMC > I/O and parameter backup functions. Use CF card or memory card to save ladder, parameters, and macro programs.
All data will be lost during main board replacement - complete system backup is mandatory.

Service Recommendedmedium confidence

Call a technician if:

·DRAM replacement required
·CPU board replacement needed
·Persistent alarm after basic checks

Prevention

Maintain proper cabinet ventilation and clean air filters regularly
Ensure stable power supply voltages
Implement proper EMI shielding and grounding practices
Perform regular backup of parameters and programs

Common Mistakes

Using non-Fanuc DRAM modules
Not following proper ESD procedures when handling boards
Ignoring power supply voltage tolerances
Attempting to repair DRAM modules instead of replacing

Related Alarms

912 914 915 916

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Always verify with your machine manual or a certified technician before performing service procedures.