Diagnostics information 2-43Operator panel service checkInspect the operator panel cable for damage. Make sure the cable is plugged in securely. Run POST, and checkeach light for proper operation. See “Power–On Self Test (POST) sequence” on page 2-1.Paper feed service checksPaper jam error indication during POSTTouch screen operator panel service checkFRU ActionOperator panel DisplayOperator panelkeyboardController boardWarning: Do notreplace the engineboard and controllerboard at the sametime. Each boardcontains the printersettings. When eitherof these boards is new,it obtains the settingsfrom the other board.Settings are lost whenboth are new andreplaced at the sametime.Touchscreen displayIf the touchscreen display does not come on or indicator LED on the keyboard doesn’tilluminate, then open the controller board cage and locate the operator panel connector atJ34. Make sure the cable is properly connected to the controller board and the controllerboard has input voltage to it.With the printer on, verify the following on connector J34:• Pins 1, 3, 5, and 6: 3.3 v• Pin 10, 16, 17, and 18: 5 v• Pins 2, 9, and 15: GNDIf any are incorrect, then see “Controller board service check” on page 2-35.If these are approximately correct and the operator panel is not functioning:1. Turn the printer off.2. Remove the left and right covers,3. Tilt the operator panel keyboard and verify the UICC cable is properly connected to thekeyboard at connector J10.4. If the cable is properly connected at both ends, check the cable for continuity. If thecable fails, replace the UICC cable.5. Reconnect the UICC cable, and verify the display ribbon cables are properly connectedto J3 and J12 on the keyboard.6. Restart the printer. If the eight LEDs on the bottom of the keyboard card illuminate, butthe display fails to illuminate, replace the touchscreen display.7. If the eight LEDs fail to illuminate, replace the keyboard.Button keypadIf the touchscreen is ok, POR into Diagnostic mode, and perform the Button test under theHardware tests. If the buttons do not respond, then replace the keyboard.FRU ActionFuser (exit sensor) If the exit sensor flag, which is visible at the back of the fuser, is in any position other thanvertical, then the printer will display a paper jam. Make sure the flag is operating freely.Replace the fuser if the sensor is damaged.Input/duplex sensorManual feed sensor Make sure the input paper feed sensors are working properly. A stuck or incorrectly installedsensor causes a paper jam indication.
