HB600‑24B is a Signet Systems Inc. automatic switching‑mode battery charger rated at 24 V, 19 A (≈600 W) used on Gen‑ie/Skyjack/JLG scissor lifts. Common failure modes include input power supply faults or blown fuses, degradation of the internal DC‑DC regulator or output capacitors leading to over‑charging protection trips, and failure of the charger’s LED status indicators due to burned‑out LEDs or damaged circuitry. First‑check diagnostics: verify 120/240 V AC input voltage and continuity of the main power fuse; inspect the output terminals for correct voltage under load and check for any error codes on the display panel; visually examine the internal board for burnt components, swollen electrolytics, or loose connections before proceeding to component replacement.[oss-gpt-20b]