RAM_WRITE_READ_EXTERNAL_SRAM
External SRAM Write/Read Test Error
Fanuc · Alpha i series AC Servo Motor
What does RAM_WRITE_READ_EXTERNAL_SRAM mean?
An error was detected during the RAM write/read test for external SRAM at power-up. This indicates a potential hardware failure within the servo amplifier module's memory, which can prevent the system from booting correctly.
Common Causes
- Hardware failure in the external SRAM of the servo amplifier module
Repair Steps & Checklist
Click steps to track your progress.
- 1
Turn the power off, then back on
- 2
If this alarm recurs, replace the servo amplifier module
Verified technical data. Last updated: March 2026
Related Faults
Source: Fanuc Alpha i series AC Servo Motor