905-290C

Check Probe Battery Status

Navigate to MOD function and check probe battery voltage display. Normal voltage should be above 2.4V for most Heidenhain probes.

Battery voltage below 2.6V indicates replacement needed soon

Replace Probe Battery

Power down machine, remove probe from spindle, and replace battery following probe manufacturer's procedure. Ensure proper polarity.

Always power down machine before probe battery replacement

Test Probe Function

After battery replacement, use TOOL CALL T99 (or appropriate probe tool number) and test probe deflection in MOD function probe test menu.

Perform probe calibration cycle after battery replacement

Access Probe Machine Parameters

Enter MOD function, select machine parameters, navigate to probe parameters MP6500-MP6599 section.

Document current parameter values before making changes

Verify Probe Type Setting

Check MP6501 (probe type) matches installed probe model. Common values: 1=TS touch probe, 2=infrared probe, 3=switching probe.

Consult probe documentation for correct MP6501 value

Check Probe Interface Parameters

Verify MP6502 (probe input) and MP6503 (probe monitoring) settings match machine wiring configuration.

MP6502 typically set to input channel where probe receiver is connected

Test Probe Response

Use probe test function in MOD menu to verify probe deflection is properly detected by TNC control.

LED on probe should illuminate when deflected if battery and electronics are functioning

Check Receiver Power and LEDs

Inspect probe receiver unit for power LED and signal LEDs. Normal operation shows steady power LED and signal LED activation during probe deflection.

Receiver typically mounted near spindle or in electrical cabinet

Verify Receiver Connections

Check all cable connections between probe receiver and TNC control, including power supply and signal cables to input modules.

Power down machine before checking electrical connections

Test with Known Good Probe

If available, test system with a known working probe to isolate whether issue is probe or receiver related.

Swap probes between machines if multiple systems available

Check Input Signal at TNC

Use TNC diagnostic screens to monitor probe input signal status during manual probe deflection.

Input should change state immediately when probe is deflected

Check Probe Tool Data

Navigate to tool table and verify probe tool (typically T99) has proper length and radius values entered.

Probe tool should have negative length value in most cases

Verify Probe Calibration Cycle

Access probe calibration menu and check if calibration values exist. Look for probe radius and length compensation values.

Calibration values should be non-zero for properly calibrated probe

Perform New Probe Calibration

Execute probe calibration cycle using calibration ring or sphere. Follow TNC prompts for automatic calibration sequence.

Ensure calibration ring/sphere is properly secured before starting cycle

Save Calibration Data

After successful calibration, save probe data to ensure values are retained. Check tool table for updated probe compensation values.

Backup probe calibration data to external storage for future reference