Engine & EDC Training June 2008

2 I.Engine II.LSU Error III.Heat Error IV.EDC Mode Agenda

3 Engine F/W controls Paper Feeding, Development,Fixing the toner, Exposure. Engine F/W is Program which is independently moved System F/W. Paper Handling Engine Controller Feeding Part Developing Part LSU Part Fixing Part Sensors Part I. Engine

4 SCX-482x engine feature  Letter : up to 30ppm, A4: up to 28ppm  Support the SCF(Option)  FPOT : up to 8.5sec (Ready State)  BLDC Motor : 1, LSU Motor : 1  Include the Main Fuser Fan, LSU Fan, SMPS Fan.  Tray don ’ t have a paper size detection sensor.

5 I. 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 printer’path 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 starting’s temperature, Warm-up time is variable. 4. If the WarmUp Process end, printer’s status is changed to Ready Status. Figure1.Warm up Motor on, Environment RecognitionAnd CR Cleaning Fusering unit 130 ℃ On Engine Ready Feed Sensor/Exit Sensor/Duplex Sensor active? N Y JAM Warmup Warmup Power On Cover Open/Close Sleep Wakeup

6 I. 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 paper’s moving. 2.After Paper’s 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. Printer’s status change Printing to Ready. If the paper don’t get out of Feed Sensor or Exit Sensor, occurred the Paper Jam.

7 LSU Error MessageReason LSU Motor Fixed Speed Error LSU Motor ErrorWhen LSU Motor isn’t reached fixed speed within 20sec. Hsync Detection Error LSU Hsync ErrorWhen not detecting Hsync signal. II.Lsu Error

8 Heat Error MessageReason FUSER OPEN Open Heat ErrorTemperature isn’t reached within 20sec in warmup. LOW HEAT Low Heat Error Under 20 ℃ than target temperature, Maintain 10sec. OVER HEAT Over Heat Error While 220 ℃ over, Maintain 20sec. While 230 ℃ over, Maintain 3sec. III.ACRONYMS AND ABBREVIATIONS III.Heat Error

9 IV.EDC Mode EDC Mode is independently controled system f/w and diagnose printer ’ s each function. Printer ’ s 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, Clutch  Development(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.

10 IV.EDC Mode The EDC Mode Enter Sequence : Menu -> Stop -> Left -> Back -> OK -> Right

11 IV.EDC Mode 0. Cover Status : Front Cover 1. Sensor Status : Regi, Feed, Exit, Empty, Out-bin 2. Motor Status : Main Motor Nor, Slow 3. Fan Test : Fuser, LSU, SMPS Fan 4. Clutch/Sol : PickUp, Regi Clutch 5. Fuser Control : Temp Control(170 ℃ ), Fuser Temp(Cur ADC) 6. Lsu Control : LD Power, LSU Motor, LSU Ready, Hsync 7. Dev Control : THV Plus, THV MINUS, DEV Bias, MHV Bias

12 V.ACRONYMS AND ABBREVIATIONS DEV - Developing High Voltage EDC - Embedded Diagnostic Control F/W – Firmware HVPS – High Voltage Power Supply H/W - Hardware LD – Laser Diode LSU – Laser Scanning Unit MHV - Main High Voltage (Charge Voltage) OPC - Optical Photo Conductor SCF - Second Cassette Feeder THV - Transfer High Voltage