Weko 7904 Sensor

Weko 7904 is an optical proximity sensor used in industrial automation for position detection and safety interlocks. Common failure points include degraded LED drive circuitry, photodiode contamination or damage, and PCB trace oxidation due to vibration or humidity. First‑check steps: verify the supply voltage and signal integrity at the input/output terminals; inspect the optical path for dust or scratches and clean with appropriate solvent; review any diagnostic codes or error logs from the host controller for indications of over‑temperature or short‑circuit conditions.[oss-gpt-20b]

Need your Weko repaired or tested?

We specialize in the repair and refurbishment of high-end industrial control electronics and power systems like this unit.

⚙️ Fast Diagnostics – Same-day evaluation available
🔁 Reliable Turnaround – Most jobs ship within 5–10 business days
🧰 Expert Technicians – Decades of board-level experience
✅ 1-Year Warranty – Every repair fully guaranteed

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