ZAPI Inc AU3503 Controller

The ZAPI AU3503 is a 24 V forklift controller/Interface Unit used in Hyster and other pallet‑truck models to manage motor drive, braking, and safety interlocks. Common failure modes for this class of controllers include burnt fuses or blown protection diodes on the power input board, degraded MOSFETs causing over‑temperature shutdowns, and faulty relay contacts that interrupt brake or horn circuits. Initial checks should verify 24 V supply continuity to the board, inspect the main power PCB for burn marks or cracked solder joints, and confirm all relays and fuses are intact; then review any diagnostic LEDs or error codes displayed on the unit’s panel.[oss-gpt-20b] Post Comment

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