Fanuc alarm 935: SRAM ECC ERROR
system alarm · Fanuc 0i-D
What it means
Uncorrectable ECC error in SRAM for part-program storage (0i-D/0i-F/30i generation)
Likely causes
- SRAM cell degradation
- battery-backed memory end-of-life
- main board memory interface fault
Triage note: ECC errors are rarely battery-related unlike 910/911; plan a main board exchange and restore from SRAM backup image
Replacement parts
We supply the following units for this alarm — tested, warranty-backed:
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A20B-8200-0740
Main CPU Board (0i-D) · Primary suspect
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A98L-0031-0012
Lithium Battery 3V (SRAM backup) · Check if others ruled out
Need the part urgently?
Send us alarm 935 with your machine details — typical RFQ turnaround is 24–48h.