Linear 21600001C Circuit Board

Linear 21600001C is a discontinued PLC/add‑on control board from Linear Semiconductor used in industrial machine‑control and automation systems. Common failure points for this class of boards include burned or tripped protection fuses, damaged I/O driver chips, and degraded power‑regulation capacitors that can cause intermittent operation or complete loss of communication. Begin troubleshooting by verifying the 24 V DC supply to the board, inspecting all connectors for corrosion or loose pins, and checking the status LEDs or diagnostic outputs for error codes; if available, perform a continuity test on the I/O driver traces and replace any visibly damaged components before proceeding with deeper diagnostics.[oss-gpt-20b]

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