41316401TH Rev.4 129 /No. Failure Flowchart No.1 Printer Malfunction after Turn-on 12 Jam Error PaperLoading Jam (1st tray) 2-1Paper Loading Jam (Multipurpose tray) 2-2Paper Feed Jam 2-3Paper Exit Jam2-4 2-4DUPLEX Jam 2-53 Paper Size Error 34 I/D Up-and-Down Operation Error 45 Fuser Unit Error 56 Motor Fan Error 6Note: When replacing the engine board (71K PWB), uninstall the EEPROM chip on the board andinstall it on the new board.(2) CU Assy troubleshootingThe CU Assy does not operate.Is the error message displayed?YES Follow the message procedure for handling the error.• NO Are the upper and lower lines of LCD on the operator panel black?NO Check the power supply voltage. 3.3V, 5V3.3V: Vacant ICOP 20pin5V: Vacant PANEL 5pinNO Replace the power supply voltageYES Check the PU board and the operator panel board.• YES Is ROM DIMM A mounted properly?NO Insert the program IDMM into the ROM DIMM A properly. When the printer isnot recovered from the error, replace the CU board.• YES Replace the CU board. Demount the EEPROM from the board and mount it on a newboard.6.5.2 Preparation for troubleshooting(1) Display on operation panelThe failure status of the printer is provided on the LCD (liquid crystal display) of the operatorpanel.Perform appropriate troubleshooting according to messages on the LCD.
