HP Color LaserJet 8500 Service Manual - Page 402

Table 42. Unnumbered printer messages (continued) (INSTALL , continued) INSTALL FUSER LOWER LEFT DOOR Description: The printer has detected that the fuser is not installed. 6 Make sure that the black toner cartridge is installed. • Install the black toner cartridge if it is not installed. • If the black toner cartridge is already installed, turn the printer off, reinstall the black toner cartridge, and turn the printer on again. 7 Reconnect connectors J641 and J644 on the main relay PCA, and connector J102 on the power supply. 8 Reconnect connector J227 on the controller board, and connector J647 on the main relay PCA. 9 Check electrical continuity between connector J644-1 (PBK) and J644-2 (PMP) when the door switch (SW644) is turned on. If there is no electrical continuity, replace the black toner cartridge on/off switch. 10 Check the upper (blue) lever (black toner cartridge lever) on the printer. Move the lever to the left. Replace the lever if it is cracked. 11 Replace the black toner cartridge if it is deformed or damaged. 12 Replace the remaining color toner sensor. 13 Replace the controller board. Event log message: None Action: 1 Install the fuser and verify that it is working correctly. 2 Reconnect connector J26 on the fuser. 3 Reconnect connector J222 on the controller board. 4 Replace the controller board. 400 Chapter 7 - Troubleshooting EN