The Dukane 4A3085A is a dual‑patient nurse call patient station featuring two ¼” call‑cord jacks and an integrated wall speaker intercom. Common failure points on this model include burned or frayed call‑cord contacts, a defective power supply module, and a failed speaker driver that can cause intermittent or no audio output. First‑check diagnostics: verify the unit’s 24 V DC input with a multimeter; inspect the call‑cord jack pins for corrosion or broken leads; test the speaker circuit by applying a known signal to the intercom and listening for continuity. If those pass, review any error codes displayed on the station’s LED indicator and perform a visual inspection of the PCB for burnt components or loose solder joints.[oss-gpt-20b]