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. 1

    Turn the power off, then back on

  2. 2

    If this alarm recurs, replace the servo amplifier module

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Verified technical data. Last updated: March 2026

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Source: Fanuc Alpha i series AC Servo Motor