The Druck DPI‑510 is a high‑accuracy programmable pressure controller/calibrator that delivers pressures from –1 bar to +210 bar (or 0–3000 psi) with ±0.025 % accuracy and offers dual range capability, barometric reference, and rate control via IEEE‑488/RS‑232 interfaces. Common failure modes include a dead or flickering LCD/LED display while the keypad remains responsive, loss of pressure regulation due to worn diaphragm seals or aging pressure transducers, and power supply board faults that cause intermittent operation or complete shutdown. First‑check diagnostics should verify the main 12 V/24 V DC supply voltage with a multimeter, inspect the internal power regulator for burn marks or capacitor leakage, and confirm that the display module’s backlight and driver ICs are receiving proper signals; additionally, review any error codes logged in the instrument’s memory via its serial interface.[oss-gpt-20b]