HP LaserJet 4100 Service Manual - Page 534

Table 37. Printer messages (continued) Control panel message Explanation Recommended action CHECK INPUT DEVICE alternates with PAPER PATH OPEN PLEASE CLOSE IT The optional input tray 1. Check the doors and paper cannot feed print media to guides and close any that are the printer because a door open. or paper guide is open. 2. If doors and trays are closed, check tabs and sensor levers in the tray for proper operation. Replace any defective tabs or sensors. 3. Replace the PCA controller in the feeder. CHECK OUTPUT DEVICE The optional output device 1. Ensure the optional output alternates with is not properly connected device is fully seated and CLOSE OUTPUT to the printer. properly installed. DELIVERY PATH 2. Check any doors on the output device and verify they are closed. CHECKING PAPER PATH The engine is checking for Wait for the printer to finish possible jams or print checking (up to 30 seconds). media that was not cleared from the printer. CLOSE TOP COVER The top cover is open and 1. Close the top cover. must be closed for printing 2. If the message persists, check to continue. SW101 for proper operation. (See page 263 for the sensor location.) Make sure wires are connected. 3. Replace SW101. 4. If the new switch does not solve the error, the wiring or the engine controller board might be defective. DISK DEVICE FAILURE The EIO disk had a critical 1. Reseat the EIO disk. failure or fatal error. 2. Remove the EIO disk and replace it with a new one. DISK FILE OPERATION The requested operation 1. Check the file name and the FAILED could not be performed (for directory name. example, attempting to 2. Reseat the EIO disk. download a file to a 3. Retry the operation. nonexistent directory). EN Chapter 7 Troubleshooting 195