The Valcom V‑2001A is a single‑zone, one‑way enhanced page control unit that integrates a built‑in tone generator and an internal power supply (±24 VDC) to provide up to 20 power units for self‑amplified speakers or horns. Common failure points in this class of paging controllers include the power supply section (voltage regulator, capacitors), the telephone interface circuitry (RJ45/phone jack contacts), and the tone generator ICs which can burn out under over‑current conditions. First‑check diagnostics: verify that the unit receives proper 24 VDC input and that the output voltage to speakers is within spec; inspect all wiring connections for corrosion or loose terminals; and review any stored error codes or LED status indicators on the front panel.[oss-gpt-20b]