Samsung ML-4600/XET Service Manual

4-2 Samsung ElectronicsTroubleshooting4-3 DCU Control4-3-1 DCU SetupDCU is used to diagnose the printer malfunctions. To use DCU, open and remove the Printer’s exit cover infront, and remove the bottom cover from left. Connect the DCU harness wire (10 pin-to-4 pin) to CN9 (4 pins)on the control board.4-3-2 Status CodeConnect the DCU to the printer and turn power on. The DCU display Status Code in the 7 segment LEDs.There are two kinds of Status Codes; Normal and Error. And their codes mean the printer operating status.NORMAL STATUS CODEThese codes mean paper location on the paper path when the printer is printing, or warming up.61 Warm up The printer warms up when the printer is turned on or the cover is closed, orwake from sleep mode.00~05 Ready(paper type) The printer is in printable state. The paper type is sensed afterone page printing.(Only 00 display because the paper type is setted Legalafter one page printing.)00: Legal , 01: Letter , 02: A4 , 03: EXEC , 04: B5 , 05: Folio20 Print Start The code is displayed when engine controller is received ‘PRINT’ commandfrom the video controller.30 Feed Sensor On It means that paper is passing the feed sensor.50 Paper out It means that paper passed the exit sensor.69 Sleep Mode It means that the printer fuser is turned off, and the power consumption isminimized.ERROR STATUS CODEIf the printer stops printing by any malfunction, the DCU displays its error status code.60,62,68 Fuser Error These codes mean the fuser error status. Heat lamp, thermistor, thermostatopen or thermistor short. The ‘Low Temperature Error’ is checked when theprinter is printing.60: Open Fuser Error62: Low Heat Error68: Over Heat Error64 Cover Open The printer cover open or no toner cartridge in the machine.70 No Paper The paper is not loaded in the printer paper tray.71 Paper Jam 0 Displays when the paper leading edge stops between the pick-up unit andthe feed sensor.72 Paper Jam 1 Displays when the paper leading edge stops between the feed sensor andthe exit sensor.73 Paper Jam 2 Displays when the paper leading edge stops after the exit sensor.95 LSU Not Ready The LSU scanner motor is not ready or ‘Hsync’ signal is not output.