Heidenhain TNC 155 controller

The Heidenhain TNC 155 is a CNC controller that drives up to four axes and displays program status on an integrated CRT or LCD panel. Common failures include loss of monitor illumination after an emergency stop (often due to a tripped main power relay or damaged power supply), RS‑232 interface faults when the original Amphenol connector is replaced or modified, and intermittent display glitches that can stem from loose board connections or a failing backlight driver. First‑check diagnostics: verify the controller’s 24 V DC power rail and ensure the main relay is not tripped; inspect all I/O connectors for continuity and correct pinout; review any displayed error codes on the monitor or via the diagnostic terminal before proceeding with component replacement.[oss-gpt-20b]

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We specialize in the repair and refurbishment of high-end industrial control electronics and power systems like this unit.

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