1 Digital Printing R & D 1 group JAN, 2007 Education of new LBP KESTREL-II (ML-4050N)

2 Agenda I.General Specification II.Process III.Disassembly IV.Troubleshooting

3 Ⅰ. General SpecificationObjectives I.Understanding the General specifications of ML-405x. II.Comprehension of the feature of major elements.

4 Ⅰ. General Specification General Size(WxDxH) Power Consumption Noise Feature Avg Operation Sleep mode Operating Standby 396x453x353mm 650 W 13 W 56 dBA 35 dBA Printer Weight Gross: 22.4 kg Net : 17.3 kg

5 Ⅰ. General Specification Print FPOT Printing Type Sleep mode Stand by Warm-up Time Up to 38 ppm(A4); 40 ppm (LTR) Duplex : Up to 26 ipm(A4); 27 ipm(LTR) 49 seconds 9 seconds 40 seconds Single cartridge 20,000 Pages (for starter, 10,000 Pages) Laser ResolutionUp to 1200 x 1200 dpi effective output Print Speed Toner Cartridge

6 Ⅰ. General Specification Paper Handling 100 sheets 250 sheets (Face Down) 500 sheets Optional CassetteN/A Capacity (20 lb) MP Tray Tray1 or Optional Tray2,3,4 Output Capacity 100 sheets (Face Up) Printing from the MP Tray to Rear output tray provides the straight paper path for printing special materials like envelopes, labels, postcards, transparencies, etc.

7 Ⅰ. General Specification Softwore & H/W Emulation 64 MB (Max. 512 MB) 256 MB optional memory available(2 Slot) PCL6, PostScript3, IBM ProPrinter, EPSON Fonts1 bitmap, 45 scalable, 136 PS3 fonts Random Access Memory (RAM) Interface IEEE 1284 Bidirectional Parallel Standard USB Interface Standard (USB 2.0) Network Interface (10/100 Base TX, b Wireless LAN) Serial Interface Interface SwitchingAutomatic (Parallel, USB, Network) OS Compatibility Windows 95/98/Me/NT4.0/2000/XP/2003, Various Linux OS including Red Hat, Caldera, Debian, Mandrake, Slackware, SuSE, and Turbo Linux, Mac 8.6~9.2/10.1~10.4

8 Ⅰ. General Specification Options Memory DIMM 10/100 Base TX, b Wireless LAN Serial Interface Card 256 MB (2 slot) (Use only the Samsung-approved DIMM) Hard DiskStoring or spooling a print job to the Hard Disk Network Card or Serial Interface Card Optional Paper Tray (Tray2,3,4) 500 Sheets of paper (Increasing the paper handling capacity) Duplex Unit Automatically printing on both sides of a sheet of paper (letter, legal, folio,and A4)

9 ML-356xML-455x ML-405x Processor SAMSUNG 400 MHzMarvell 500 MHz SAMSUNG 400 MHz SPEE D SIMPLEX Up to 35 ppm (LTR)Up to 45 ppm (LTR) Up to 40 ppm (LTR) DUPLEX Up to 24 ipm (LTR)Up to 30 ipm (LTR) Up to 27 ipm (LTR) TONER pages (6,000 pages) 20,000 pages (10,000 pages) 20,000 pages (10,000 pages) Optional Tray One additional TrayThree additional Tray Memory (Max.) 32 MB (Max. 288 MB)128 MB (Max. 512 MB) 64 MB (Max. 512 MB) Ⅰ. General Specification

10 Ⅰ. General SpecificationReview ML-405x is Mono Laser Printer and its print speed is up to 40ppm(Letter).

11 Ⅱ. ProcessObjectives I. Understanding the basic structures and operating principle of each parts II.Studying the printing process and electronic photo process III.Comprehension of System Layout

12 Ⅱ. Process Paper Input (Cassette) Develop Unit Fuser Unit Transfer Roller LSU (Laser Scan Unit) System Layout 6 MP Tray 7 Duplex Unit

13 Ⅱ. Process Printing Process

14 Ⅱ. Process Electronic Photo Process

15 Ⅱ. Process System Layout Feeding Method : Cassette Type Feeding Standard : Center Loading Feeding Capacity : Cassette 500 Sheets(75g/ ㎡, 20lb Paper Standard) Paper Detecting Sensor : Photo Sensor Paper Size Sensor : Yes 1. Cassette (Main and Optional Tray) Main and Optional Tray

16 Ⅱ. Process System Layout Feeding Standard : Center Loading Feeding Capacity : 100 Sheets (75g/ ㎡, 20lb Paper Standard) Transparency (50 typical) Labels (25 typical) Envelopes (up to 10) 1. Cassette MP Tray

17 Ⅱ. Process System Layout The life span: Print over 150,000 sheets (in 15~30 ℃ ) 2. Transfer Ass’y

18 Ⅱ. Process System Layout It is a power delivery unit by gearing 3. Driver Ass’y By driving the motor, it supplies the power to the feeding unit, the fusing unit, and the distributing unit. Two motors(Main motor & Deve motor) used for driving gears. A solenoid used for change paper direction for duplexing.

19 Ⅱ. Process System Layout Pressure roller and Heat roller heated by E-coil 4. Fuser Ass’y Two Thermostat – Temperature-Intercepting Device Thermistor – Temperature Detecting Sensor

20 Ⅱ. Process System Layout The fuser is consisted of the Heat Roller with E-coil, Pressure Roller, Thermistor, and Thermostat. 4. Fuser Ass’y Engine Fuser Error When warming up, it has been lower than 60 ℃ over 35 seconds. Engine Fuser Over Heat Error It has been higher than 230 ℃ over 10 seconds. ErrorPhenomenon - Standby : It has been lower than 130 ℃ over 10 seconds - Printing Up to 2 consecutive pages : : It has been lower than 155 ℃ over 7 seconds. From 3 consecutive pages : : It has been 25 ℃ lower than the fixed fusing temperature over 7 seconds. Engine Fuser Low Heat Error

21 Ⅱ. Process System Layout Consisted of LD(Laser Diode) and Polygon Motor Control. 5. LSU(Laser Scan Unit) LSU NOT READY When the polygon motor speed doesn’t become standby. ErrorPhenomenon HSYNC ERROR The polygon motor speed is standby but the Hsync is not generated

22 Ⅱ. Process System Layout 6. Toner Cartridge Developing Method: Non-magnetic 1 element non-contacting method Toner: Non magnetic 1 element shatter type toner (Averag Dia. 0.8 ㎛ ) OPCD/RS/RTURBINE AGITATOR CLEANING BLADE C/R Dr.BLADE CLEANING ROLLER HANDLE Used Toner Capa. : 368 CC New Toner Capa. : 1400 CC 200 ㎛ OPC D/R The life span of toner cartridge : 10,000 Sheets or 20,000 Sheets (N/N, Simplex,ISO 5% Coverage Pattern)

23 Ⅱ. Process System Layout 6. Toner Cartridge OPC Cleaning: Collect the toner by using Cleaning Blade Management of disusable toner: Collect the toner by using Cleaning Blade OPC Drum protecting Shutter : Yes

24 Ⅱ. Process System Layout 7. Duplex Unit Automatically print on both sides of a sheet of paper with an optional duplex unit Supports the following paper sizes : Letter, Legal, Oficio, Folio, and A4

25 Ⅱ. Process System Layout 8. Optional Paper Tray Increase the paper handling capacity by installing optional Tray2,3 and 4 Holds 500 sheets of paper (Cassette is same as printer Tray1 cassette)

26 Review I.What is the function of paper- sensor? II.How long is life of Transfer-Roller? III.What is the function of Thermistor and Thermostat. Ⅱ. Process

27 Ⅲ. DisassemblyObjectives I.Practicing the skill of decomposition and assembly. II. Understanding the basic structures of major part (Engine, Scan).

28 Ⅲ. Disassembly General Precautions on Disassembly

29 Ⅲ. Disassembly Open the Open Cover. Hold the lever at both ends of the roller, then remove the roller 1. Transfer Roller 1 2

30 Ⅲ. Disassembly Open the MPF Ass’y Remove the Tray Link from the MP Cover 2. MPF Ass’y 1 2 Remove two springs from the Knock Up Plate Ass’y 3 Push the MP Cover and remove it, as shown below 4

31 Ⅲ. Disassembly Unplug the connector and remove the three screws. Remove the Photo Interrupter and the MP Actuator. 3. Holder Pad Ass’y 1 2

32 Ⅲ. Disassembly Remove the lock as shown below and take out the Roller-Idle Ass’y 4. Roller Idle Ass’y 1

33 Ⅲ. Disassembly Remove four screws. Then lift the Idle Unit, as shown below 5. Feed2 Idle Ass’y 1

34 Ⅲ. Disassembly Pull the Cassette out of the Printer. Remove two screws and take out the right side, as shown below. 6. Cover Right 1 2

35 Ⅲ. Disassembly Unplug the all Connectors, as shown below. 7. Main PBA 1 Remove two screws and take out the Dummy Bracket 2 Remove six screws and take out the Main PBA 3

36 Ⅲ. Disassembly Unplug the two Connectors from the Main Motor Ass’y and the Connector PBA 8. Main Drive Ass’y 1 Take out the FEED-GEAR 2 Remove five screws and take out the Main Drive Ass’y 3 When separating the Main Motor, just remove four screws, and then remove the Main Motor 4

37 Ⅲ. Disassembly Unplug the Connector from the Deve Motor Ass’y. 9. Deve Drive Ass’y 1 Remove four screws and take out the DEVE Drive Ass’y 2 When separating the DEVE Motor, just remove four screws, and then remove the Deve Motor 3

38 Ⅲ. Disassembly Unplug the all Connectors from the Connector PBA and take it out. 10. Connector PBA 1 The Connectors are located, as shown below 2 We don’t use “Clutch” Connector.

39 Ⅲ. Disassembly Unplug the MP Solenoid Harness and the Main Solenoid Harness from the Connector PBA. 11. Solenoid 1 Remove one screw and take out the MP Solenoid. 2 Remove one screw and take out the Main Solenoid. 3

40 Ⅲ. Disassembly Pull the Cassette out of the printer. 12. Cover Left 1 Open the Open Cover and remove two screws and take out the left side. 2 Take out the Cover Left. 3

41 Ⅲ. Disassembly Open the Rear Cover, and then take out the Stopper. 13. Rear Cover 1 Remove the Rear Cover in the direction of arrow. 2

42 Ⅲ. Disassembly Open the MPF Ass’y, the Rear Cover, the Open Cover. 14. Top Cover 1 Unplug the Connector after you remove the three screws from the Main PBA 2 Unlatch both ends of the Top Cover. 3 Unlatch the hook and take out the Top Cover. 4

43 Ⅲ. Disassembly Remove two screws and take out the Stopper 15. Open Cover 1 Take out the Open Cover, as shown below. 2

44 Ⅲ. Disassembly Remove two screws and take out the Inner Cover. 16. Inner Cover 1

45 Ⅲ. Disassembly Remove two screws and pull the Locking Lever. Then take out the Fuser Ass’y. 17. Fuser Ass’y 1 2 Remove two screws and take the Thermostat out of the Fuser Ass’y. 3 Remove tow screws securing the Electrode L, R and remove it. 4 Remove tow screws securing the Fuser Upper unit and remove it, as shown below.

46 Ⅲ. Disassembly 5 Remove two screws securing the Release Lever L, R and remove it, as shown below 6 Remove two screws and take out the Gear Bracket. 7 Take out the Heat Roller Ass’y. 5 Remove two screws securing the Release Lever L, R and remove it. 8 Remove the screws securing the Thermistor and remove it, as shown below.

47 Ⅲ. Disassembly Unplug the Exit Solenoid Hamess from the Main PBA. 18. Exit Solenoid Ass’y 1 Remove three screws and take out the Exit Solenoid Ass’y. 2 Remove two screws and take out the Exit Solenoid. 3

48 Ⅲ. Disassembly Take out the Actuator. 19. Exit Roller 1 Remove Exit Roller and Bearing. 2 Remove the Exit Gear, as shown below. 3 Remove the Duplex Exit Roller as same method. 4 Release the Duplex Exit Gear, as shown below. 5

49 Ⅲ. Disassembly Remove the Cover-Frame Exit and unplug the Connector from the main PBA. 20. LSU 1 Remove three screws and take out the LSU. 2

50 Ⅲ. Disassembly Unplug the two Connectors from the Toner Sensor PBA. 21. DC Fan 1 Remove the screw for taking out the Stopper, and then take out the DC Fan. 2

51 Ⅲ. Disassembly Unplug the all Connectors from the Toner Sensor PBA. 22. Toner Sensor PBA 1 Remove two screw and taking out the Toner Sensor PBA. 2 Remove the screw securing the Cover Open PBA and remove it. Then unplug the Connector from the Main PBA. 3 Remove three screw and taking out the LSU Lower Cover. 4

52 Ⅲ. Disassembly Remove four screws. 23. REGI Ass’y 1 Release the lock as shown below and lift up the Gear Cap. 2 Take out the REGI Ass’y. 3 Unplug the Harness, remove the screw and take out the PTL PBA. 4

53 Ⅲ. Disassembly First of all remove two screws. Lift up the MP Pick Up Shaft for taking out the MP Pick UP Rack. 24. MP Pick UP Ass’y 1 Remove the locking equipment rotate the Bearing in the direction of arrow. 2 Remove the screw securing the Bracket and remove the Gear Ass’y, as shown below. 3

54 Ⅲ. Disassembly Side the Cam to The right by pulling on the MP Pick Up Shaft. 4 Fist lift the side of the Shaft and then remove the Shaft. 5 Push the Idle toward the ends of Shaft then take out the Housing, as shown below. 6

55 Ⅲ. Disassembly Remove the Gear-Pick Up Cam. 25. Pick Up & Feed2 Ass’y 1 Take out Feed Gear and remove the locking equipment rotate the Bearing in the direction of arrow. 2 Release the Pick Up Gear and remove the locking equipment rotate the Bearing in direction of arrow, as shown below. 3 Feed Gear

56 Ⅲ. Disassembly Remove four screws securing the Bottom Cross Bar and remove it. 4 Remove the Actuator as shown below. 5 Remeov four screws securing the Guide-P-Front. Than take out the Pick Up Unit. 6

57 Ⅲ. Disassembly Remove two screws securing the Guide-M-Support and remove it. 7 Remove the Pickup Roller Ass’y, as shown blow. 8 9 Remove the Feed1 Roller, as shown blow.

58 Ⅲ. Disassembly Remove four screws securing the Feed2 Unit and remove it. 10 Remove the Roller Unit, as shown below. 11

59 Ⅲ. Disassembly Remove six screws and slightly lift the Engine Shield. 26. Engine Shield 1 Remove the Duplex Guide L, R. 2 Unplug the all Connectors from the Engine PBA. Then take out the Engine Shield Ass’y. 3 Remove four screws and take out the Engine PBA out of the Shield. 4

60 Review I.Can you disassemble and assemble ML-405x? Ⅲ. Disassembly

61 Objectives I.Building ability to deal with various problems raised in the field by reviewing troubleshooting. II.Check the solution of each problem. III.Check the difference of each Jam. Ⅳ. Trouble Shooting

62 1.Replace the toner cartridge and test again 2.Replace the toner cartridge and test again 3.Replace the transfer roller and test again Ⅳ. Trouble Shooting Printing Problems – Causes and Solutions 1. Vertical Black Line and Band Description: 1. Straight thin black vertical lines occur in the prnting 2. Dark black vertical bands occurrs in the printing Check and CauseSolution 1.Damaged developer roller, deformed Doctor-blade or cleaning blade in the toner cartridge. 2.Scratched surface of the charge roller in the toner cartridge. 3.Depression or deformation of the surface of the transfer roller.

63 Ⅳ. Trouble Shooting Printing Problems – Causes and Solutions 2. Vertical White Line Description: White vertical voids in the image. Check and Cause 1.Clean the LSU window with recommended cleaner(IPA). Clean the window with a clean cotton swab. If dir is inside the LSU-replace LSU. 2.Replace the toner cartridge. 3.Clean the exposure window. 4.Open the front cover and check the ribs that correspond to the position of the voids. Remove if found. 5.If the problems are not solved, replaced the toner cartridge. 6.Replace the transfer roller. Solution 1.Contamination of the window or internal lenses of LSU mirror. 2.Foreign object inside the toner cartridge or low toner. 3.Foreign object, contamination or burr on the edge of the toner cartridge window. 4.Of the fuser is defective, void occur periodically at the top of a black image. 5.Contamination of the OPC Drum. 6.Depression or deformation of the surface of the transfer roller

64 Ⅳ. Trouble Shooting Printing Problems – Causes and Solutions 3. Horizontal Black Bands Description: Dark or blurry horizontal stripes occur in the printing periodically (These may occurs at regular intervals down the page.) Check and Cause 1.Clean all HV terminals in the cartridge and on the set frame. Ensure all toner or paper dust, particles are removed. 2.Clean the right Gear that has relatively small tooth gap on the OPC. 3.If the problems are not solved, replaced the toner cartridge. Solution 1.Bad contacts on the toner cartridge high voltage terminals. 2.The rollers in the toner cartridge may be contaminated. 1)Charge roller – 38.3 mm 2)Supply roller – 44.1 mm 3)Develop roller – 46.5 mm 4)Transfer roller – 55.9 mm

65 Ⅳ. Trouble Shooting Printing Problems – Causes and Solutions 4. Black/White Spot Description: 1. Dark or blurry spots occur periodically in the printing 2. White spots occur periodically in the printing Check and Cause 1.Print several OPC cleaning Mode Prints and then run the Self-test 2 or 3 times mm repetition: Examine the surface of the OPC drum and carefully clean with a soft, lint free cloth. If unsuccessful replace the cartridge mm repetition: Replace the toner cartridge. 3. The Transfer roller guarantees 150,000 sheets printing. If the roller’s life expired, replace it. Note:Cleaning the inside of the set to remove excess toner particles or paper dust will reduce the occurrence of this problem. Solution 1.If dark or blurry spots occur periodically, the rollers in the Developer may be contaminated with foreign matte or paper particles. (Charge roller: 38.3 mm interval OPC drum : 94.4 mm interval) 2. If faded areas or voids occur in al black image at interval 94.4 mm, or black spots occur elsewhere, the OPC drum surface is damaged. 3. If a black image is partically broken, the transfer voltage is abnormal or the transfer roller’s life has expired.

66 Ⅳ. Trouble Shooting Printing Problems – Causes and Solutions 5. Light Image Description: The printed image is light, with no ghost. Check and Cause 1.Ensure the Toner Save mode is off. Check set and driver settings. 2.Replace the toner cartridge and try to print out again. 3.Wait 30 minutes ager printer is powered in before you start printing. 4.Clean the cartridge and set contacts. Generally ceal dirt from inside of the set. 5.Replace the HVPS if the problem are not solved by the above four instructions. Solution 1.Toner Save mode enabled. 2.Develop roller is contaminated or the toner cartridge is almost empty. 3.Ambient temperature is below than 10 ℃ 4.Bad contact caused by dirty terminals on the toner cartridge or set. 5.Abnormal output from the HVPS.

67 Ⅳ. Trouble Shooting Printing Problems – Causes and Solutions 6. Dark image or Black Description: The printed image is dark. Check and Cause 1.Check the state of the connector which connects the engine board and HVPS. 2.Clean the high voltage charge terminals. Note if 1 and 2 do not solve the problem persists replace the HVPS. 3. Replace the LSU or Main PBA. Solution 1.No charge voltage in the engine board. 2.Charge voltage fault due to bad contact between toner cartridge and set contacts. 3.VD0 signal of the Main PBA is low state.

68 Ⅳ. Trouble Shooting Printing Problems – Causes and Solutions 7. Uneven Density Description: Print Density is uneven between left and right. Check and Cause 1.Replace the left and right bush and spring assemblies. 2.Replace the toner cartridge and try to print out. 3.Gently shake the toner cartridge and try printing again. If the problem persists replace the toner cartridge. Solution 1.The pressure force in the left and right springs of the transfer roller is not even, the springs are damaged, the transfer roller is improperly installed, or the transfer roller bushing or holders are damaged. 2.The life of the Toner Cartridge has expired. 3.The toner level is not even in the toner cartridge roller due to the damaged blade or low toner.

69 Ⅳ. Trouble Shooting Printing Problems – Causes and Solutions 8. Background Description:Light dark background appears in whole area of the printing. Check and Cause 1.The toner cartridge is basically designed to print 10000/20000 sheets with 5% image. If it prints more than those sheets with 2% coverage, a background can occur. 2.The A/S is not guaranteed if using a recycled toner cartridge. Note: Try shaking the toner cartridge gently from side to side. If the problem persists, replace the toner cartridge. 3.Replace the toner cartridge when its life is expired. 4.Clean the transfer roller bushes. 5.Clean the high voltage charge terminals. If this does not reslove the problem replace the HVPS. Solution 1.Printing large quantities of low coverage(2%) pages or the printer has not been used for a long time. 2.Is a recycled toner cartridge be used? 3.Has the life span of the toner cartridge ended? 4.Is the movement(Up and Down) of the transfer roller smooth? 5.Is the HVPS normal?

70 Ⅳ. Trouble Shooting Printing Problems – Causes and Solutions 9. Ghost(1) Description: Ghost occur at 94.4mm intervals of the OPC drum in the whole Printing Check and Cause 1 and 2. Clean all HV contacts. If problem persist replace the HVPS. If problem still persists replace the Main PBA. 3.Replace the toner cartridge and try to print out 4.Check the transfer roller lifetime and replace it. 5.Wait about 30 minutes after power in before using printer. 6.Replace the toner cartridge and try to print out again. Solution 1.Bad contacts caused by contamination from toner particles between high voltage terminal in the main body and the electrode of the Toner cartridge. 2.Bad contacts caused by contamination from toner particles between high voltage terminal in the main body and the one in the HVPS board. 3.The life of toner cartridge is expired. 4.Transfer roller life(150,000 sheets) has expired. 5.Low ambient temperature(below10 ℃ ) 6.Damaged cleaning blade in the toner cartridge.

71 Ⅳ. Trouble Shooting Printing Problems – Causes and Solutions 10. Strain in the Face of the Page Description: The background on the face of the printed page strained. Check and Cause 1.Replace the toner cartridge. 2.If the transfer roller is contaminated, run PC Cleaning Mode Print 2 or 3 times and then perform Self-Test 2 or 3 time to remove contamination. Solution 1.Toner leakage due to improperly sealed toner cartridge. 2.If the transfer roller is contaminated, strain on the face of page will occur.

72 Ⅳ. Trouble Shooting Printing Problems – Causes and Solutions 11. Strains on Back of Page Description: The back of the page is strained at 55.9 or mm intervals. Check and Cause 1.Perform the OPC Cleaning Mode Print 2 or 3 times. Run Self- Test to remove the contamination form the transfer roller. Note: Replace the transfer roller if it is contaminated. 2. Disassemble the fuser and clean the Heat Roller and Pressure Roller. Check and clean the area between the Heat Roller and the Thermistor. (Caution: Take care not to deform the rollers) Solution mm: Transfer roller is contaminated mm: Pressure roller is contaminated.

73 Ⅳ. Trouble Shooting Printing Problems – Causes and Solutions 12. Blank Page Print out(1) Description: Blank page is printed. Check and Cause 1.Check if the Ground-OPC or the OPC Groung Zender diode are defective or open circuit.(set inside left side). 2.Remove contamination of the terminals in the toner cartridge and the unit. Solution 1.Bad ground contacts in OPC and/or toner cartridge.

74 Ⅳ. Trouble Shooting Paper Feeding Problems – Causes and Solutions 1. Wrong Print Position Description: Printing begins at wrong position on the paper. Check and Cause 1.Replace the defective actuator. Solution 1.Wrong sensor timing caused by defective feed sensor actuator.

75 Ⅳ. Trouble Shooting Paper Feeding Problems – Causes and Solutions 2. Jam 0 Description: 1. Paper does not exit from the cassette. 2. Jam-0 occurs when the paper feeds into the printer Check and Cause 1.Replace the solenoid. 2.Repair/replace as required. 3.Clean with soft cloth dampened with IPA(Isopropyl Alcohol) or water. Replace if required. 4.Clean with soft cloth dampened with IPA(Isopropyl Alcohol) or water. Replace if required. 5.Ensure all rollers are clean and free to operate correctly. Solution 1.Check the Solenoid by using Tech Mode. 2.Check the cassette knock- up plate and springs. 3.Check the paper separator pad. 4.Check the pick-up roller for contamination and correct assembly. 5.If continuous clusters occur, check all rollers between pick-up and registration sensor.

76 Ⅳ. Trouble Shooting Paper Feeding Problems – Causes and Solutions 3. Jam 1 Description: 1. Paper is jammed in front of or inside the fuser. 2. Paper is stuck in the exit roller and in the fuser just after passing through the Actuator-Feed Check and Cause 1.Replace SMPS or main PBA. 2.Reassemble the Actuator- Feed and spring-Actuator if the movement is bad. Replace if necessary. Solution 1.If the recording paper is jammed in front of or inside the fuser. 2.If the recording paper is stuck in the exit roller and in the fuser just after passing through the Actuator-Feed, Feed Actuator may be defective.

77 Ⅳ. Trouble Shooting Paper Feeding Problems – Causes and Solutions 4. Jam 2 Description: 1. Recording paper is jammed in front of or inside the fuser. 2. Recording paper is stuck in the discharge roller and in the fuser just after passing through the Actuator-Feed. Check and Cause 1.If the paper is stuck in the fuser: disassemble the fuser and remove the jammed paper and clean the surface of the pressure roller with dry gauze. Check all ribs, claw and springs. Solution 1.If the paper is rolled in the Fuser Roller. -This occurs when a Guide claw is broken away, damaged or deformed. -It occurs when the Heat Roller or Pressure Roller is seriously contaminated with toner.

78 Ⅳ. Trouble Shooting Paper Feeding Problems – Causes and Solutions 5. Duplex Jam 1 Description: A Message ‘Duplex JAM 1’ is displayed in a LCD window. Check and CauseSolution 1.It is a case when a paper cannot enter the Duplex unit. 2.It is a case when a paper cannot reach to a duplex sensor due to a paper jam on a duplex path. 1.Check the Duplexer Connection. If is not connected properly, connect the Duplex to the Machine. 2.A case that a paper jam occurs on (A) after it is reversed: replace a 2 nd exit roller after checking its operation. 3.A case that a paper jam occurs on (B) after it is reversed: replace a duplex roller after checking its operation

79 Ⅳ. Trouble Shooting Paper Feeding Problems – Causes and Solutions 6. Duplex Jam 0 Description: A message ‘Duplex JAM 0’ is displayed in a LCD window. Check and CauseSolution 1.It is a case that a paper cannot pass a duplex sensor. 2.It is a case that a paper cannot reach to a registration sensor after it is passed a duplex sensor 1.A case that a leading edge of a paper is jammed on (A) check an operation of a guide front. If it is worn or defective, replace it 2.Check an operation of a feed roller and a registration roller. If they are worn or defective, replace them

80 Ⅳ. Trouble Shooting Paper Feeding Problems – Causes and Solutions 7. Multi-Feeding Description: Multiple sheets of paper are fed at once. Check and Cause 1.Adjust paper guides. 2.Replace the solenoids or PBA as appropriate. 3.Clean the friction pad rubber with a soft cloth dampened with IPA(Isopropyl Alchol) or water. 4.Use paper with a smother surface finish. Solution 1.Check that the paper size guides are set correctly(cassette tray). 2.Solenoid malfunction (Solenoid does not work properly). 3.Friction Pad is contaminated. 4.Paper has a rough surface texture.

81 Ⅳ. Trouble Shooting Paper Feeding Problems – Causes and Solutions 8. Paper rolled in the fuser Description: Paper rolled around fuser rollers or ‘Concertina’ jam Check and Cause 1.After disassembling the fuser, clean contamination from between the heat roller and the thermistor and also clean contamination from the pressure roller. Clean the surface of the rollers with IPA or water. 2.Check for damage or deformation of the print claws and the holder plate claws, and repair or replace as appropriate. Solution 1.Contamination of the pressure roller or heat roller. 2.Damaged or deformed ribs, claw or springs.

82 Ⅳ. Trouble Shooting Paper Feeding Problems – Causes and Solutions 9. Paper rolled on the OPC Drum Description: Paper is rolled up in the OPC. Check and Cause 1.Use paper that conforms to the printer specification. 2.Ensure paper is stored properly to prevent curl. Note: To remove paper roller in the OPC. - Remove the toner cartridge from the set, taking care not to touch the green surface. Use he gearwheel at the side to rotate the OPC drum and pull the paper from the cassette. - Clean fingerprints on the OPC gently with soft tissue, taking care not to scratch the surface. Solution 1.Paper is too thin. 2.The face of paper is curled.

83 1. Jam 0 Ⅳ. Trouble Shooting

84 2. Jam 1 Ⅳ. Trouble Shooting

85 3. Jam 2 Ⅳ. Trouble Shooting

86 4. Multi-feed JAM Ⅳ. Trouble Shooting

87 5. Over Heat Error Ⅳ. Trouble Shooting

88 6. Low Heat Error Ⅳ. Trouble Shooting

89 7. LSU Error Ⅳ. Trouble Shooting

90 Ⅳ. Trouble Shooting NoRollerPeriodPhenomenon 1OPC Drum 94.4 mm White and Black Spots 2Charge Roller38.3 mmBlack Spot and Periodic Band 3Supply Roller 44.1 mmPeriodic Band by little difference of density 4Developing Roller46.5 mmWhite Spot, Horizontal black band 5Transfer Roller55.9 mmGhost, Damaged Image by abnormal tranfer 6Heat Roller125.6 mmBlack Spots or Vertical Black Band 7Pressure Roller125.6 mmBackground Table. Periodic Images according to Rollers

91 Ⅳ. Trouble Shooting Consumable Part Following items should be replaced after specified number of print-outs No.PartsCodeFig.Yield (pages) 1Transfer Roller JC B 150,000 2Pick-up Roller JC A 150,000 3Fuser Roller JC A/B 150,000 4Holder PAD JC A 150,000 5Roller Idle JC A 150,000

92 Ⅳ. Trouble Shooting Sensor Review No.SensorComments 1Check Paper SensorPaper Margin 2Feed SensorJAM0, JAM1 3Exit SensorJAM2 4Duplex Feed SensorDuplex JAM1

93 Review I.Do you know differences of Jam 0, Jam1, and Jam 2? Ⅳ. Trouble Shooting

94 Ⅳ. Trouble Shooting