HP Color LaserJet 8500 Service Manual - Page 404

Table 42. Unnumbered printer messages (continued) (INSTALL IMAGING DRUM OPEN FRONT DOOR, continued) 11 Check the drum cartridge on/off switch lever on the printer. Set the lever at the correct position if it is disconnected. Replace the lever if it is cracked. 12 Reconnect connector J209, and relay connectors J47 and J48 on the controller board. 13 Replace the controller board. INSTALL TRANSFER DRUM OPEN RIGHT DOOR Event log message: None Description: The printer has detected that the transfer drum is not installed. Action: 1 Install the transfer drum before attempting to print. Note: All doors must be closed for the printer to 2 detect the transfer drum. If the right upper cover 3 interlock is defeated, this error will occur unless the density sensor is covered with paper. Take the transfer drum out and reinstall it. Make sure that the transfer drum is installed. • If the transfer drum is not already installed, install the transfer drum. • If the transfer drum is already installed, turn the printer off, verify the transfer drum is in the correct position, and turn the printer on again. 4 Reconnect connector J1101 on the density sensor PCA, intermediate connectors J75 and J46, and connector J206 on the controller board. 5 Measure the voltage across connector J704-1 (+24 VAR) and GND on the density sensor PCA after the printer is turned on. If the voltage is not approximately 24 V, replace the density sensor PCA. 6 Replace the controller board. LANGUAGE = Event log message: None Description: Displayed during start up. The printer has recognized the key sequence for changing the control panel language. Action: No action is required. For more information on changing the printer control panel display language, see page 97. = Printer control panel display language 402 Chapter 7 - Troubleshooting EN