Surftronic 3 112/1518‑1283661 is the data‑logging recorder module for a Taylor‑Hobson Surtronic 3 surface profilometer, used to capture and store roughness measurements. Common failures on this unit include power supply dropout or voltage spikes causing the microcontroller to reset, loss of communication with the main controller (serial/USB), firmware corruption leading to “boot loop” or unresponsive status LEDs, and degradation of the internal flash memory or SD card slot due to humidity or dust ingress. First‑check diagnostics: verify 12 V/5 V supply rails with a multimeter; inspect the serial/USB interface for loose connectors and confirm proper baud rate settings in the host software; review any error codes displayed on the module’s LCD or status LEDs, and perform a quick firmware checksum or reflash if corruption is suspected.[oss-gpt-20b]