HP Color LaserJet Enterprise CP4020 Service Manual - Page 380

Table 3-14 Control-panel messages (continued) Description Recommended action 49.XXXX ERROR A firmware error has occurred. To continue turn off then on 50.1 FUSER ERROR 50.2 FUSER ERROR Low fuser temperature. Fuser warm-up failure This error can be caused by corrupted print jobs, software applications issues, nonproduct specific printer drivers, poor-quality USB or network cables, bad network connections or incorrect configurations, invalid firmware operations, or unsupported accessories. 1. Turn the product off and then on. 2. If the error returns, check the following items: ◦ The error might be caused by a network connectivity problem, such as a bad interface cable, a bad USB port, or an invalid network configuration setting. ◦ The error might be caused by the print job, such as an invalid printer driver, a problem with the software application, or a problem with the file you are printing. ◦ Upgrading the product firmware might help resolve the error. See the product user guide for more information. 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. 1. Reinstall the fuser. 2. Check the connector J50 between the fuser and the product. If either is damaged, replace the connector or fuser. See Fuser on page 85. 3. Reconnect the connectors J160 and J162 on the DC controller PCA and connector J25 on the power line between the low voltage power supply and fuser. 4. Replace the wire harness that connects the fuser. 5. Replace the fuser. See Fuser on page 85. 6. If the error persists, replace the lowvoltage power supply. See Low-voltage power supply (LVPS) on page 157. 348 Chapter 3 Solve problems ENWW