HP CM3530 - Color LaserJet MFP Laser - Page 427

7. Insert a piece of paper to activate the primary transfer-roller disengagement sensor.
Figure 7-13 Test the primary transfer-roller disengagement sensor (2 of 2)
8. Check the control-panel display for sensor response.
9. If no response, replace the sensor.
ENWW Tools for troubleshooting 397