The Technifor CN‑200SP gear box is a compact servo‑drive control unit used in engraving and marking machines, featuring a digital controller (UC200) and pneumatic/linear motion components. Common failure modes for this class include power supply degradation (voltage dips or brownouts), overheating of the drive board due to inadequate ventilation, loss of communication with the host PLC, and wear or blockage in the pneumatic cylinders that can cause stalled gear operation. Initial diagnostic steps: verify 24 V DC input voltage and check for proper grounding; inspect the PCB for burnt traces or swollen capacitors and confirm that all connectors are secure; review any error codes displayed on the control panel and cross‑reference with the user manual for fault codes related to motor overload, communication loss, or pneumatic pressure issues.[oss-gpt-20b]