ITT Industries 879‑1820‑004c is a control/joystick circuit board used in Genie scissor‑lift platforms; it typically interfaces with the lift’s drive and safety interlocks. Common failure modes for this board include burned or cracked surface‑mount components (especially voltage regulators, LEDs, and capacitors), damaged solder joints on the joystick input traces, and corrosion or disconnection of the 4‑wire connector to the lift controller. First‑check diagnostics: verify that the board receives proper power from the lift’s main supply (24 VDC/AC as specified); inspect for visible signs of component damage or overheating; confirm continuity and correct voltage at the joystick input pins and output signals to the drive; and review any error codes logged by the lift controller for related fault flags.[oss-gpt-20b]