Firetrol PC1061N is an industrial battery charger used to power emergency lighting and signaling systems; it features a micro‑processor controlled charging stage that delivers a regulated DC output to lead‑acid batteries. Common failure modes include a dead or degraded charge controller IC, blown or corroded fuses on the input side, failed relay contacts in the charging circuit, and worn battery terminals or wiring connections. First‑check steps: verify the AC supply voltage and polarity at the charger inlet; inspect all fuses and relays for continuity and signs of overheating; visually examine the battery terminals and wiring for corrosion or loose connections before proceeding to microcontroller diagnostics.[oss-gpt-20b]