The Dukane nurse call station is a patient‑side intercom unit that interfaces with the central master or duty stations via wired voice and tone signals, typically using 2‑conductor or 4‑wire cabling. Common failure modes include loss of audio due to degraded speaker or microphone contacts, failure of the call button or cancel switch, and power supply issues such as a faulty DC regulator or blown fuse in the unit’s internal board. Visual symptoms often show dim or non‑illuminating status LEDs, erratic call indicator lights, or intermittent call placement that requires a reset.

First‑check diagnostics: verify 12 VDC (or specified) input at the unit’s power connector; inspect all wiring for continuity and proper termination to the master station; check the condition of the pushbutton contacts and speaker/microphone assemblies with a multimeter or oscilloscope. If the unit powers but shows no audio, review any error codes displayed on the LED panel and confirm that the associated master or duty station is correctly configured to accept calls from this patient station.[oss-gpt-20b]