Emerson-Rittenhouse RC 633 door chime unit

The Emerson‑Rittenhouse RC 633 is a wall‑mounted industrial door chime that produces audible alerts for door opening and closing, with selectable tone and volume settings via internal relays and coil assemblies. Common failure modes on this model include burnt or failed relay contacts, degraded capacitor function in the power supply section, and loose or corroded wiring connections to the door switch contacts. First‑check diagnostics should verify 12–24 V AC/DC input voltage, inspect the relay contacts for pitting or oxidation, and confirm continuity of the door switch leads; if those are sound, examine the internal capacitor values and replace any that show leakage or bulging.[oss-gpt-20b]

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