Engine & EDC Training June 2008

Engine LSU ErrorHeat ErrorEDC ModeAgenda

Engine Engine F/W controls Paper Feeding, Development ,Fixing the toner, Exposure. Engine F/W is Program which is independently moved System F/W.PaperHandling

Engine ControllerFeeding PartDeveloping PartLSUPartFixing PartSensorsPart

Engine

SCX-482x engine feature

Letter : up to 30ppm, A4: up to 28ppmSupport the SCF(Option)FPOT : up to 8.5sec (Ready State)BLDC Motor : 1, LSU Motor : 1Include the Main Fuser Fan, LSU Fan, SMPS Fan.Tray dont have a paper size detection sensor.

Engine

Warm-up Process Procedure

1. Warm-up is occurred at three cases : Power On, Cover Open/Close, Sleep Wakeup

2. If Warm-up start, Feed Sensor and Exit sensor is judged that the sensor is active or inactive, if active, we judge that printerpath is having a paper. After JAM Warm-up that Remove the paper, carry out normal Warm-up.

3. As soon as Warm-up, Unit that Fixing the tonor is heated. If Current Temperature is 130, Move the Motor. Progress Environment recognition and the process for CR. For reference, before move the Motor, because we wait unit that fixing the toner is heated over 130. According to Warm-up startings temperature, Warm-up time is variable.

4. If the WarmUp Process end, printers status is changed to Ready Status.

Engine

Printing Process Procedure

1. If Printer is received the printing command from Driver, First of all, Start the LSU. And then We judge that Poligon Motor(LSU Motor) is reached fixed speed. If not reaching within the fixed time, LSU Error(PMotor Error) is occurred. If reaching within the fixed time, pick up the paper for papers moving. 2.After Papers pickup, if Feed Sensor is not detected the paper, Repick up the paper. For all that, if not detecting the paper, we occurred the Paper Jam0(Re-pickup twice)

3. Normally, if Feed Sensor is detecting the paper, send the Psync signal, expose the Video Data to OPC. And judge that Hsync signal(to detect Video Data according to each Line) is recevied. If Hsync is not received, printer will occurred LSU Error(HSync Error).

4. Normally, After detecting the Hsync Signal, progress the transfer process.

5. Finally, judge that the paper get out of Feed Sensor. Printers status change Printing to Ready. If the paper dont get out of Feed Sensor or Exit Sensor, occurred the Paper Jam.

LSU Error

Lsu Error

MessageReasonLSU Motor Fixed Speed ErrorLSU Motor ErrorWhen LSU Motor isnt reached fixed speed within 20sec.Hsync Detection ErrorLSU Hsync ErrorWhen not detecting Hsync signal.

ACRONYMS AND ABBREVIATIONS Heat Error

Heat Error

MessageReasonFUSER OPENOpen Heat ErrorTemperature isnt reached within 20sec in warmup.LOW HEATLow Heat ErrorUnder 20 than target temperature, Maintain 10sec.OVER HEATOver Heat ErrorWhile 220 over, Maintain 20sec. While 230 over, Maintain 3sec.

EDC ModeEDC Mode is independently controled system f/w and diagnose printers each function.Printers elements which is diagnosed.Sensor (Feed, Exit, Regi, Empty, Out bin) - To diagnose all sensor status.Feeding the Paper (Motor,Solenoid,Clutch) - To diagnose all Motor, Solenoid, ClutchDevelopment(DEV,MHV,THV) - To diagnose all High Voltage for the development.Exposure(LD,LSU) To diagnose LSU and related Units.Fixing the toner(Fuser unit) To diagnose the fuser unit.

EDC ModeThe EDC Mode Enter Sequence : Menu -> Stop -> Left -> Back -> OK -> Right

EDC Mode0. Cover Status : Front Cover1. Sensor Status : Regi, Feed, Exit, Empty, Out-bin2. Motor Status : Main Motor Nor, Slow3. Fan Test : Fuser, LSU, SMPS Fan4. Clutch/Sol : PickUp, Regi Clutch5. Fuser Control : Temp Control(170), Fuser Temp(Cur ADC)6. Lsu Control : LD Power, LSU Motor, LSU Ready, Hsync7. Dev Control : THV Plus, THV MINUS, DEV Bias, MHV Bias

ACRONYMS AND ABBREVIATIONS DEV - Developing High VoltageEDC - Embedded Diagnostic Control F/W FirmwareHVPS High Voltage Power SupplyH/W - HardwareLD Laser DiodeLSU Laser Scanning Unit MHV - Main High Voltage (Charge Voltage)OPC - Optical Photo ConductorSCF - Second Cassette FeederTHV - Transfer High Voltage