The Ranger PM6000 is a compact power‑quality logger designed for three‑phase monitoring of voltage, current, harmonics, flicker and waveform data. Common failure points in this class include the front‑panel LCD/display, internal power supply ICs (often a DC/DC converter or regulator), and the analog front‑end (current transformer inputs and voltage dividers). For initial troubleshooting, first verify that the unit receives proper 48 VDC from its external adapter and check for any visible arcing or burnt components on the PCB. Next, inspect all I/O connectors for loose contacts or corrosion, and confirm that the display is functioning by cycling the power‑on reset. Finally, review any stored error codes in the log file; a persistent “0xFF” code often indicates a failed ADC calibration or power‑supply dropout.[oss-gpt-20b]