Samsung ML-1440 Service Manual

Also see for ML-1440: Product guide User guide User guide

Troubleshooting4-3Samsung Electronics4-1-3 Self Diagnostic ModeIf Error code occurs due to malfunction of the printer, perform Self Diagnostic Mode to solve the problem.The printer works only in the self-test mode to solve the malfunction problem.To enter the self-test mode, turn the power on pressing the buttons of [Down], [Shift] and [Stop] at the same time.Release the button within 2 or 3 seconds if 78 shows in the DCU. If 00 shows in the DCU, press the button [Up] or [Shift]to select the self+test , and press the button of [Enter] to operate. To stop, press the button of [shift] and [Enter] together.00 Main Motor Operating SystemOnly the main motor is in operation.01 Main High Voltage On(THV-)-1400 voltage output by MHV terminal. Caution : High voltage probe should be used.02 Transfer High Voltage(-)On(THV-)-1000 voltage output by MHV terminal. Caution : High voltage probe should be used.03 Transfer High Voltage (+)Reference on (THV +)+800 voltage output by MHV terminal. Caution : High voltage probe should be used.04 DEV/supply High Voltage : DEV/Supply High Voltage Test.The left one of the three LEDs in the self-test panel is on when DEV high voltage Supply high voltage outputby each HV terminal(-500V). Press the [Up] button to switch the voltage. The middle and right one of the threeLEDs are on and -650 voltage output by DEV HV terminal. Caution : High voltage probe should be used.05 LSU Operating SystemThe scanning motor of LSU is in operation, the right LED of the three buttons on. Press the [Up] button toCheck LD. LD is functioning and the middle button is on. If the LD is normal, all LEDs are on.06 Pickup clutch onThe Solenoid in the printer is in operation. To stop the operation, Press the button [shift] and [Enter] together.07 Paper Empty(1st, SCF, MF) Sensor Test :If activate the Actuator of the PEMPTY/PWIDTH Sensor, the left and right of the three LEDs are on.Paper Empty Sensor (1st) ON/OFF 1st LED ON/OFFPaper Empty Sensor (SCF) ON/OFF 2nd LED ON/OFFPaper Empty Sensor (MP) ON/OFF 3rd LED ON/OFFIncrement DCU Code No. (08, Sensor TEST)08 Feed & Exit Sensor TestTest the Feed sensor and Discharge sensor in the same way as '06'.09 Cover Open Sensor TestThe same way as code '06'.10 Fuser TestIf the [Enter] button pressed, the right LED is on and temperature of the fuser is up to READY Mode. If the[Up] button pressed, the middle LED is on and temperature of the fuser is up to Printing Mode.If you press the button once more, the left LED is on and temperature of the fuser is up to overheat Mode.11 Hot Burn TestIf the [enter] button pressed, the printer is continuously printing without detection.Turn the power off to stop operation.12 Cleaning Mode Print ModePrint the paper to clean the OPC Drum in the Cartridge.