Heidenhain TNC 351 / TNC 355 CNC Control Service Manual 06/1992 PDF
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Official DR. JOHANNES HEIDENHAIN factory service manual (06/1992) for TNC 351 and TNC 355 contouring controls. 121-page technician guide with full error/fault messages, LE 351/355 logic unit schematics, connector pinouts, power supply, keyboard/display testing, encoder/handwheel diagnostics and buffer battery replacement.
Description
Heidenhain TNC 351 / TNC 355 CNC Control Service Manual 06/1992 – PDF DOWNLOAD
Description
This is the original HEIDENHAIN Service Manual for TNC 351 and TNC 355 (Issue 06/1992) β the complete factory-level technical reference for servicing these classic 1990s HEIDENHAIN CNC contouring controls used on milling, drilling, and boring machines worldwide. Although officially discontinued, thousands of TNC 351/355 systems remain in daily production in 2025, making this manual indispensable for machine tool rebuilders and CNC service engineers.
Covers board-level diagnostics and repair:
- Complete error message and fault message tables with causes
- Detailed description of Logic Unit LE 351/355 (processor & CLP boards)
- Full connector layout and pin assignments
- Grounding concept and external power supply requirements
- Power supply board testing and 24 V DC PLC supply
- Buffer battery replacement procedure
- Keyboard unit TE 351/355 testing and key matrix
- Display units BE 212/412 diagnostics
- Encoder, handwheel, and 3D touch probe troubleshooting
- Measuring system error diagnosis
Complete Table of Contents
- How to use the Service Manual
- Error Messages & Possible Causes
- Fault Messages and their Causes
- Logic Unit LE 351/355 (designation, hardware, connector layout, processor/CLP boards, grounding diagram)
- External Supply (NC & PLC power, power supply board testing, buffer battery)
- Keyboard Unit TE 351/355 (circuit diagram, testing, key matrix)
- Display Unit BE 212/412
- Measuring Systems (error messages, testing)
- Handwheel (overview & testing)
- 3D-Touch Probe Systems (overview & error messages)
Essential for anyone maintaining or repairing Heidenhain TNC 351/355-equipped machine tools.
File Details
- Manual name: Service Manual TNC 351/355
- Models covered: Heidenhain TNC 351, TNC 355 (LE 351/355 logic unit)
- Year: June 1992
- PDF quality: Good factory scan, fully searchable, clear schematics
- Number of pages: 121
