Fagor alarm 4187: ERROR 821: Image capturing sensor (CCD) error
CNC 8055 SERCOS drive error (DDS) · Fagor DDS drives
What it means
The CCD/LED scanning unit inside the encoder or scale reader head reports self-test failure.
Likely causes
- LED illumination end-of-life (years of duty)
- CCD die cracked by shock/vibration
- internal condensation/corrosion in head housing
Triage note: Heads are sealed units - no field CCD repair. Order complete scale or head per series documentation; record distance-coded vs single-mark variant before ordering.
Replacement parts
We supply the following units for this alarm — tested, warranty-backed:
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S2OX/S2X series (match travel)
Linear scale assembly with new scanning head · Primary suspect
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SP-1024-R-C5-IP66
Rotary encoder (if fault on rotary feedback) · Common cause
Need the part urgently?
Send us alarm 4187 with your machine details — typical RFQ turnaround is 24–48h.