The Chadwick‑Helmuth 135M‑10B Strobex is a handheld, self‑contained strobe lamp that operates from 28 VDC and uses a locking oscillator to flash at up to 1,000 RPM for blade‑track monitoring on turbomachinery. Common failure modes include loss of high‑intensity output due to LED burnout or internal diode failure, oscillator lock‑out or drift caused by capacitor degradation, and power supply voltage sag from the onboard regulator or battery depletion. First‑check diagnostics: verify 28 VDC input and regulator output with a multimeter; inspect the strobe head for visible LED damage or overheating; review any stored error codes on the unit’s display (if available) and perform an oscillator frequency test using a tachometer or oscilloscope.[oss-gpt-20b]