HP Color LaserJet Enterprise CP4020 Service Manual - Page 381

Table 3-14 Control-panel messages (continued) Description Recommended action 50.3 FUSER ERROR High fuser temperature 50.4 FUSER ERROR Drive circuit fault 50.5 FUSER ERROR The incorrect fuser was installed. 50.7 FUSER ERROR Fuser pressure-release mechanism failure 50.8 FUSER ERROR Low fuser temperature. Reinstall the fuser. Check connector J50 between the fuser and the product. If either is damaged, replace the connector or fuser. See Fuser on page 85. If the error persists, replace the low-voltage power supply. See Low-voltage power supply (LVPS) on page 157. 1. Check the power source. Make sure the power source meets product requirements. 2. Reconnect the connector J150 on the DC controller PCA. 3. If the message persists, replace the lowvoltage power supply. See Low-voltage power supply (LVPS) on page 157. CAUTION: The fuser can be hot while the product is in use. Wait for the fuser to cool before handling it. 1. Open the right door. 2. Remove the incompatible fuser. 3. Install the correct fuser. 4. Close the right door. 1. Reconnect the fuser-pressure release sensor intermediate connector J60, and connector J128 on the DC controller PCA. 2. Run the sensor test in the sensor monitor mode to verify that the fuser pressure-release sensor is functioning properly. If it is not, replace the fuser pressure-release sensor. 3. Check the fuser pressure-release sensor flag. If it is damaged, replace the fuser. 4. Run the fuser pressure-release drive test in actuator drive mode to verify that the fuser motor is functioning properly. If it is not, replace the fuser motor. See Fuser motor on page 200. 5. If the message persists, replace the fuser. See Fuser on page 85. Remove the fuser and any residual paper. Check connector J50 between the fuser and the product. If either is damaged, replace the connector or fuser. See Fuser on page 85. ENWW Tools for troubleshooting 349