Sensor Checks and Calibration
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      1. Cyklop Needham Knowledge Hub
      2. CIJ Printer Maintenance & Troubleshooting
      3. Sensor Checks and Calibration

      How do I test the photocell on a CM750 printer?

      Use this quick diagnostic method to confirm if your CM750’s product sensor (photocell) is working or needs replacing.

      Why test it?

      The photocell triggers the print based on product detection. If it’s faulty or misaligned, you’ll see missed prints, double prints, or no print at all.

      How to test the photocell

      1. Go to System > Diagnostics > Sensor Test

      2. Position a product or hand in front of the photocell

      3. Observe the screen – the signal should register ON/OFF

      4. If nothing changes:
         - Check alignment
         - Clean sensor lens
         - Inspect cable connection

      Fault signs

      • Continuous “ON” or “OFF” state

      • No response during triggering

      • Unstable print timing or misfires

      Fixes

      • Re-seat the connector

      • Replace the sensor

      • Reconfigure trigger settings (Trigger vs Gate)