The Granville‑Phillips 332102 is an ionization gauge controller that interfaces with vacuum gauges to provide pressure readings from 10⁻⁹ Torr up to 10⁻³ Torr and supplies power to the gauge via a dedicated module. Common failure points for this model include degraded power supply modules (high‑voltage output drift), faulty signal conditioning circuitry, and connector corrosion leading to intermittent communication with the gauge. First‑check diagnostics: verify that the controller’s main power input is within spec and that the high‑voltage output remains stable; inspect all gauge‑to‑controller cables for signs of wear or oxidation; and review any error codes displayed on the unit’s front panel, correlating them with the manual’s fault table.[oss-gpt-20b]