HP Color LaserJet Enterprise CM4540 Service Manual - Page 651
Clear jams, Table 3-15
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Table 3-15 Causes and solutions for residual media jams Cause Solution The sensor detecting a residual media jam is not working. One of the four sensors is reporting a residual jam. Test each sensor using the manual sensor test. See Manual sensor test on page 378 for information. If the sensor does not respond, replace the component indicated: ● TOP sensor (SR20): Replace the registration assembly. See Registration assembly on page 213. ● Fuser delivery sensor (SR5): Replace the sensor. ● Loop sensor 1 or 2 (SR14 and SR15): Replace the fuser. See Fuser on page 112. ● Duplex re-pickup sensor (SR22): Replace the registration assembly. See Registration assembly on page 213. If service was recently performed on the product, a sensor connector might be disconnected. Run the manual sensor tests to verify which sensor detects the media. See Manual sensor test on page 378 for information. Reconnect the corresponding sensor connector: ● TOP sensor: Connector (J74) and (J145) on the DC controller PCA ● Fuser delivery sensor: Connector (J48) and connector (J127) on the DC controller PCA ● Loop sensor 1 or 2: Connector (J162) on the DC controller PCA ● Duplex re-pickup sensor: Intermediate connector (J74) and connector (J145) on the DC controller PCA. Table 3-16 Causes and solutions for pickup delay jams 2 Cause Solution Poor contact of the pickup motor drive connector. Reconnect the connector (J37) of the pickup motor and connector (J260) of the DC controller PCA . The pickup motor is defective. Execute the pickup-motor driving test in the actuator-drive mode. If the motor is defective, replace the pickup motor. See Pickup motor on page 259. The pickup roller is worn or deformed. Replace the pickup roller. See Feed and separation rollers (Trays 2-5) on page 113. The tray 2 separation roller is worn or deformed. Replace the separation roller. See Feed and separation rollers (Trays 2-5) on page 113. Poor contact of the TOP sensor connector. Reconnect the intermediate connector (J74) of the TOP sensor and connector (J145) on the DC controller PCA. The TOP sensor (SR20) is defective. Run the manual sensor test to verify that the TOP sensor is functioning properly. See Manual sensor test on page 378 for information. If it is not, replace the registration assembly. See Registration assembly on page 213. Poor contact of the pickup solenoid drive connector. Reconnect the connector (J59) of the pickup solenoid and (J115) on the DC controller PCA. ENWW Clear jams 599
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