Xerox Phaser 3450 Service Manual
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Xerox Phaser 3450 Service Manual

Xerox Phaser 3450 Service Manual

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SERVICE
LASER PRINTER
LASER PRINTER
Phaser 3450
Manual
CONTENTS

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Summary of Contents for Xerox Phaser 3450

  • Page 1: Table Of Contents

    LASER PRINTER Phaser 3450 SERVICE Manual LASER PRINTER CONTENTS 1. Precautions 2. Reference Information 3. Specifications 4. Summary of product 5. Disassembly and Reassembly 6. Alignment and Adjustments 7. Troubleshooting 8. Exploded Views and Parts List 9. Block Diagram 10. Connection Diagram...

  • Page 2: Precautions

    Precautions 1. Precautions The cautions in the below are items needed to keep in mind when maintaining and servicing. Please read carefully and keep the contents in mind to prevent accidents while servicing and prevent any damages to the damage. 1.1 Warning for safety.

  • Page 3: Caution For Safety

    Precautions 1.2 Caution for safety 1.2.1 Precaution related noxious material There is a possibility to get harm from noxious material if you ignore the below information. (1) Do not touch the damaged LCD. This PRINTER has LCD in control panel. Noxious liquid to human body exists in the LCD.
  • Page 4 Precautions 1.2.3 Precaution related handling the machine. If you ignore this information, you get hurt and machine could be damaged. (1) Do not install unit on uneven surfaces or slanted floors. Please confirm that unit is correctly balanced after installation. Machine may fall over when itis not bal- anced correctly.

  • Page 5: Esd Precautions

    Precautions 1.3 ESD Precautions Certain semiconductor devices can be easily damaged by static electricity. Such components are commonly called “Electrostatically Sensitive (ES) Devices”, or ESDs. Examples of typical ESDs are: integrated circuits, some field effect transistors, and semiconductor “chip” components. The techniques outlined below should be followed to help reduce the incidence of component damage caused by static electricity.

  • Page 6: Reference Information

    Reference Information 2. Reference Information This chapter describes the reference information for applying this training manual, and it is consist- ed of the tool list, the abbreviation table, the outline of model, and so on. 2.1 Tool for Troubleshooting The following tools are recommended for safe and smooth troubleshooting described in this service manual. DVM(Digital Volt Meter) Tweezers Standard : Indicates more than 3 digits.

  • Page 7: Acronyms And Abbreviations

    Reference Information 2.2 Acronyms and Abbreviations The table in the below explains abbreviations used in this service manual. The contents of this service manual are declared with abbreviations in many parts. Please refer to the table. Alternating Current Isopropy Alcohol ASIC Application Specific Integrated Circuit Images Per Minute...

  • Page 8: Selecting A Location

    Reference Information 2.3 Selecting a Location Select a level,stable place with adequate space for air circulation.Allow extra space for opening covers and trays. The area should be well-ventilated and away from direct sunlight or sources of heat,cold,and humidi- ty.Do not set the printer close to the edge of your desk or table. CLEARANCE SPACE •...

  • Page 9: Specifications

    Specifications 3. Specifications Product specifications are subject to change without notice.See below for product specifications. 3.1 General Specifications ITEM DESCRIPTION Print Method Non-impact Electro-photography Development system Non-Magnetic, Mono-Component Toner Transfer system Conductive roller transfer Fuser Unit(Toner fix) Pressure and Heating with Lamp Print Speed 24 PPM : A4 size , IDC 5% pattern 25 PPM : Letter size , IDC 5% pattern...

  • Page 10: Controller Specification

    Specifications 3.2 Controller Specification ITEM DESCRIPTION Processor(CPU) ARM946E-S (CLOCK SPEED 166Mhz) Memory FLASH ROM(PROGRAM) : 2MB flash RAM : 16MB (Expandable to 144MB) Option DIMM module : 16,32,64,128MB (SDRAM) 100Pin SDRAM DIMM (Samsung Printer Only) EEPROM(NVRAM) : 512byte Emulation PCL6 : win 3.1/95/98/ME/NT/2000/XP Postscript Level3 : win 95/98 PPD , win NT4.0 PPD , Mac PPD PCL5e : Linux Interface...

  • Page 11: Environmental Condition

    Specifications 3.5 Environmental Condition ITEM OPERATING STORAGE Temperature 10~30 oC(50-90 oF) -20~40 oC (-4~104 oF) Humidity 20~80%RH 10~80%RH 3.6 Paper Handling Specifications >> Input Paper Size PAPER PAPER SIZE 1ST CASSETTE 2ND CASSETTE MP TRAY DUPLEX 210 X 297 mm Letter 216 X 279 (8.5 X 11") Folio (Legal13")
  • Page 12 Specifications Service Manual...

  • Page 13: Summary Of Product

    Summary of product 4. Summary of Product This chapter describes the functions and operating principal of the main component. 4.1 System Layout Pick up Pick up Pick up Roller(MP) Roller(MP) Roller(MP) Regi Regi Regi Transfer Transfer ransfer Roller Roller Roller Roller Roller Roller...
  • Page 14 Summary of Product 4.1.1 Feeding It is consists of a basic cassette, an MP tray for supplying different types of media : envelope, label special paper, duplex unit, and parts related to paper transferring. 1) Separation method Separate it from the finger mounted to the cassette side guide and apply retard roller that uses a spring clutch.
  • Page 15 Summary of product 4.1.2 Transfer It consists of a PTL (Pre-transfer Lamp) and a transfer roller. A PTL sheds light on an OPC drum, lowers an electric potential of an OPC drum's surface, and improves the efficiency of the transfer. A transfer roller transfers toner on an OPC drum to the paper.
  • Page 16 Summary of Product 4.1.6 Toner Cartridge By using the electronic photo process, it creates a visual image. In the toner cartridge, the OPC unit and the developer unit are in a body. The OPC unit has OPC drum and charging roller, and the developer unit has toner, toner cartridge, supply roller, developing roller, and blade (Doctor blade) - Developing Method : Non magnetic 1 element contacting method - Toner : Non magnetic 1 element shatter type toner...

  • Page 17: Main Board

    Summary of product 4.2 Main Board Main controller part is organized with Asic (SPGPm) part, Memory part, and Engine interface part, and it is functions as a Bus control, I/O handling, Drivers, and PC interface by CPU. Memory access has program memory (supports 16bit operation) and working memory (supports 32bit operation). PTL CON.(CN15) ENGINE P AB CON.(CN18) DCU CON.(CN9)
  • Page 18 Summary of Product 4.2.1 ASIC (SPGPm) ARM946ES • 32-bit RISC embedded processor core • 16KB instruction cache and 16KB data cache • No Tightly Coupled Memory • Memory Protection Unit & CP15 control program (Dual bus architecture for bus traffic distribution •...
  • Page 19 Summary of product 4.2.1.1 SPGPm Internal Block Diagram ARM946E -S CORE EXTERNAL 16KB ICACHE DMA CONTROLLER 16KB DCACHE USB2.0 (4CH) CONTROLLER ADDR/ AHB BUS ARBITER DATA CONTROLLER DECODER SYSTEM SFR BUS INTERFACE INTERFACE SYSMAC CLOCK & RESET GENERATOR SYSTEM PLL (120MHz) HPVC 512x8...

  • Page 20: Reset Circuit

    Summary of Product 4.2.2. Memory part >> Flash Memory It stores the System Program. • Capacity : 2M Byte • Access Time : 70 nsec >>SDRAM It is used as Swath buffer, System working memory area, etc. when printing. It stores the font list, compressed into flash memory, on DRAM and uses it as PCL font.
  • Page 21 Summary of product 4.2.6. Sensor input circuit 4.2.6.1. Paper Empty Sensing The Paper empty sensor (Photo Interrupter) on the engine board informs the state of paper to CPU whether it is empty or not by operation of the actuator. When cassette is empty, it detects the fact by reading the D24 Bit of CPU, and then displays the fact on the LCD panel. 4.2.6.2.
  • Page 22 Summary of Product 4.3 SMPS & HVPS board The SMPS and HVPS are in one united board. The SMPS part supplies the DC power to the system. It takes either 110V or 220V and outputs the +3.3V and +24V to supply the power to the main board. The HVPS part creates the high voltage of THV/MHV/Supply/Dev and supplies it to the developer part for making the best condition to display the image.
  • Page 23 Summary of product 4.3.1. HVPS(High Voltage Power Supply) 1) Transfer high voltage (THV (+)) - Function : It is a voltage that transfers toner on an OPC Drum to paper. - Output voltage : MAX +4.2 KV +/- 5% (Duty is changeable, Not loading) - 1.6KV +/- 15% (When cleaning, 200MOhm - It transfers toners with (+) polarity of transfer roller to an OPC Drum.
  • Page 24 Summary of Product 4.3.2 SMPS(Switching Mode Power Supply) It is the power source for the whole system. It is an independent module so it is possible to use for common use. It is mounted at the bottom of the set. It consists of the SMPS part, which supplies the DC power for driving the system, and the AC heater control part, which supplies the power for fuser.

  • Page 25: Fuser Ac Power Control

    Summary of product >>Feature • Insulating resistance : over 50MΩ(at DC 500V) • Insulating revisiting pressure Must be no problem within 1min. (at 1500Vzc, 10mA) • Leaking voltage : under 3.5mA • Running voltage : under 50A peak (at 25°C, Cold start) Under 60A peak (in other conditions) •...
  • Page 26 Summary of Product 4.4 Engine F/W 4.4.1 Feeding If feeding from a cassette, the drive of the pickup roller is controlled by controlling the solenoid. The on/off of the solenoid is controlled by controlling the general output port or the external output port. If feeding from a manual feeder, decide to insert the paper according to the operation of the manual sensor, and by driving the main motor, insert the paper in front of the feed sensor.
  • Page 27 Summary of product 4.4.4 Fusing The temperature change of the heat roller’s surface is changed to the resistance value through the thermistor. By con- verting the voltage value, which impressed to the resistance, to the digital value through the AD converter, the temperature is decided.
  • Page 28 Summary of Product Service Manual 4-16...

  • Page 29: Disassembly And Reassembly

    Disassembly and Reassembly 5. Disassembly and Reassembly 5.1 General Precautions on Disassembly When you disassemble and reassemble compo- Releasing Plastic Latches nents, you must use extreme caution. The close proximity of cables to moving parts makes proper Many of the parts are held in place with plastic routing a must.

  • Page 30: Transfer Roller

    Disassembly and Reassembly 5.2 Transfer Roller 1. Open the Open Cover. 2. Hold the lever at both ends of the roller, then remove the roller. Transfer Roller Open Cover Holder <Cautions When Replacing a Transfer Roller> * Do not grab the transfer roller shown in picture (A). It may cause a malfunction due to a foreign object.
  • Page 31 Disassembly and Reassembly 5.3 MPF Ass’y 1. Open the MPF Ass’y. 3. Remove the Tray Links from the MP Cover Tray Link MPF Ass’y 2. Remove two springs from the Knock Up Plate 4. Push the MP Cover and remove it as shown Ass’y.
  • Page 32 Disassembly and Reassembly 5.4 Retard Ass’y 1. Remove two screws. Then lift the Roller Ass’y, as Notice: When you reassemble the Retard shown below. Roller ass’y make sure that the let and of the Retard roller fits into the Retard shaft. Retard Ass’y Service Manual...
  • Page 33 Disassembly and Reassembly 5.5 RH Cover 1. Pull the Cassette out of the printer. Cassette 2. Remove two screws and take out the Right Side. RH Cover Service Manual...

  • Page 34: Main Pba

    Disassembly and Reassembly 5.6 Main PBA 1. Before you remove the Main PBA you should 4. Remove two screws and take out the Dummy remove: Bracket. - RH Cover (Refer to the 5.5) 2. Unplug all the connectors, as shown below. Dummy Bracket 3.
  • Page 35 Disassembly and Reassembly 5.7 Main Drive Ass’y 1. Before you remove the Right Side Ass'y, you should 5. Remove six screws and take out the Main Drive remove: Ass’y. - RH Cover (Refer to the 5.5) 2. Unplug the two Connectors after you remove the two scres and take out the Cover Joint PBA.

  • Page 36: Connector Pba

    Disassembly and Reassembly 5.8 Connector PBA 1. Before you remove the Connector PBA, you should 3. The connectors are located as shown below. remove: - RH Cover (Refer to the 5.5) 2. Unplug all of the connectors from the Connector MP Solenoid Clutch PBA and take it out.
  • Page 37 Disassembly and Reassembly 5.9 Solenoid 1. Before you remove the Connector PBA, you should 4. Remove two screws and take out the Main remove: Solenoid. - RH Cover (Refer to the 5.5) - Main Drive Ass’y (Refer to the 5.7) 2.
  • Page 38 Disassembly and Reassembly 5.10 LH Cover 1. Pull the Cassette out of the printer. 3. Remove two screws and take out the LH Cover Cassette LH Cover 2. Remove two screws and take out the Right Side. Rear Cover Service Manual 5-10...
  • Page 39 Disassembly and Reassembly 5.11 DC Fan 1. Before you remove the DC Fan, you should remove: 3. Remove one screw for taking out the Stopper, - RH Cover (Refer to the 5.5) and then take out the DC Fan. - LH Cover (Refer to the 5.10) DC Fan Stopper 2.

  • Page 40: Rear Cover

    Disassembly and Reassembly 5.12 Rear Cover 1. Open the Rear Cover, and then take out the 2. Remove the Rear Cover in the direction of Stopper. arrow. Rear Cover Tie Stopper Service Manual 5-12...

  • Page 41: Top Cover

    Disassembly and Reassembly 5.13 Top Cover 1. Before you remove the Top Cover, you should 4. Unlatch both ends of the Top Cover. remove: - RH Cover (Refer to the 5.5) - LH Cover (Refer to the 5.10) 2. Open the MPF Ass’y, the Rear Cover, the Open Cover.

  • Page 42: Open Cover

    Disassembly and Reassembly 5.14 Open Cover 1. Before you remove the Open Cover, you should 4. Release the lock as shown below and lift up the remove: Sensor Cap. - Top Cover (Refer to the 5.13) 2. Remove two screws and take out the Stopper. Stopper Micro Switch PBA Sensor Cap...
  • Page 43 Disassembly and Reassembly 5.16 Fuser Ass’y 1. Before you remove the Fuser Ass’y, you should 4. Remove one screw, and then take out the remove: Thermistor from the Fuser Ass’y. - Rear Cover (Refer to the 5.12) Thermistor 2. Remove four screws and take out the Fuser Ass’y.
  • Page 44 Disassembly and Reassembly 6. Remove three screws and take out the Gear 8. Take out the Heat Roller as shown below. bracket. Heat Roller Gear Bracket Bushing Fuser Gear 7. Remove two screws and divide the Fuser into 9. Take out the Pressure Roller as shown below. two parts.
  • Page 45 Disassembly and Reassembly 5.17 Exit Drive 1. Before you remove the Exit Driver, you should 3. Take out the Cover-Motor-BLDC after remove remove: tow screws and take out the Exit Driver Ass’y - Top Cover (Refer to the 5.13) after remove three screws. 2.

  • Page 46: Exit Roller

    Disassembly and Reassembly 5.18 Exit Roller 1. Before you remove the Exit Roller, you should 4 Take out the Exit Gear as shown below. remove: - Top Cover (Refer to the 5.13) 2. Take the Actuator out. Bearing Actuator Exit Gear 5.
  • Page 47 Disassembly and Reassembly 5.19 LSU 1. Before you remove the LSU, you should remove: 4. Remove three screws and take out the LSU. - RH Cover (Refer to the 5.5) - LH Cover (Refer to the 5.10) - Top Cover (Refer to the 5.5) 2.
  • Page 48 Disassembly and Reassembly 5.20 Toner Sensor Board 1. Before you remove the Toner Sensor Board, you 4. Remove 3 screws and take out the LSU Lower should remove: Cover. - Top Cover (Refer to the 5.13) - LSU (Refer to the 5.19) LSU Lower Cover 2.
  • Page 49 Disassembly and Reassembly 5.21 REGI Ass’y 1. Before you remove the REGI Ass’y, you should 5. Remove one screw and take out the Regi. remove: Sensor. - Top Cover (Refer to the 5.13) REGI Sensor 2. Unplug the Harness, Remove 3 screws. Sensor Holder 6.
  • Page 50 Disassembly and Reassembly 5.22 MP Pick-up Ass’y 1. Before you remove the MP Pick-up Ass’y, you should 4. Pull and remove the lock equipment, then rotate remove: the Bearing as shown below. - MPF Ass’y (Refer to the 5.3) - Main Drive Ass’y (Refer to the 5.7) Bearing - Top Cover (Refer to the 5.13) - Inner Cover (Refer to the 5.15)
  • Page 51 Disassembly and Reassembly 6. First lift the left side of the Shaft and then 7. Push the idles toward the ends of shaft then remove the Shaft. take out the Housing as shown below. Idle Idle Housing Service Manual 5-23...
  • Page 52 Disassembly and Reassembly 5.23 Pick-up Ass’y 1. Before you remove the Pick-up Unit, you should 4. Remove two springs from the Pick-up Ass’y. remove: - RH Cover (Refer to the 5.5) - Main Drive Ass’y (Refer to the 5.7) 2. Remove E-Ring and take The Gear-Pick-up Cam out.
  • Page 53 Disassembly and Reassembly 6. Remove the locking equipment rotate the Feed 8. Remove the Feed Ass’y as shown below. Roller Shaft’s in the direction of the arrow and slide the bearing off as shown below. Pick Up Roller Feed Roller 9.

  • Page 54: Engine Shield

    Disassembly and Reassembly 5.24 Engine Shield 1. Remove the Guide-Front-Dup.( Refer to the 5.23.5) 4. Unplug all of the connectors from the Engine PBA. Then take out the Engine Shield Ass’y. 2. Remove the Actuator as shown below. Actuator Power Shield Notice: Be careful not to get burnt when sep- arating an Engine PBA.
  • Page 55 Disassembly and Reassembly 5.25 Engine PBA 1. Before you remove the Engine Shield, you should 5. Remove four screws and take the Engine Board remove: out of the Duplex Unit. - Engine Shield (Refer to the 5.25) Engine PBA 5.26 Holder Pad Ass’y 1.

  • Page 56: Alignment And Adjustments

    Alignment & Adjustments 6. Alignment and Adjustments This chapter describes the main functions for service, such as the product maintenance method, the test output related to maintenance and repair, DCU using method, Jam removing method, and so on. It includes the contents of manual. 6.1 How to use EDC (Engine Diagnostic Control) Mode 6.1.1 EDC Setup •...
  • Page 57 Alignment & Adjustments 6.1.2 How to use EDC (Engine Diagnostic Control) Mode Interface Test Test Pattern Print Motor/Fan Test Tray3 Interface Pattern Print Main Motor Laser Motor Duplex Forward Duplex Reverse Tray3 Motor Fan Test HVPS Test Sensor Test Solenoid Test Dev Bias Test Tray1 Sensor Tray1 Solenoid Test...
  • Page 58 Alignment & Adjustments 6.1.2.1 Interface Test (Main controller and Tray3 controller) - This Function is used to check the communication state between the main controller and the tray 3 controller. 1. Press the "Menu Key", until finding "Interface Test" message on the panel. 2.
  • Page 59 Alignment & Adjustments 6.1.2.3 Motor & Fan Test - These Functions are used to check the present state (normal or not) of the motors and fan. 1. Press the "Menu Key", until finding "Motor/Fan Test" is displayed on the panel. 2.
  • Page 60 Alignment & Adjustments 6.1.2.4 Solenoid & Clutch Test - These Functions are used to check the present state (normal or not) of the solenoids and clutches. 1. Press the "Menu Key", until finding "Solenoid Test" is displayed on the panel. 2.
  • Page 61 Alignment & Adjustments 6.1.2.5 Sensor Test - These Functions are considered to check the present state (normal or not) of the Sensors. 1. Press the "Menu Key", until finding "Sensors Test" message on the panel. 2. Press the "Select Key", when it's found. 3.
  • Page 62 Alignment & Adjustments 6.1.2.6 HVPS Test Item : High Voltage Power Supply - These Functions are used to check whether the control for HVPS is normal or not. 1. Press the "Menu Key", until finding "Developing Test" is displayed on the panel. 2.

  • Page 63: Paper Path

    Alignment & Adjustments 6.2 Paper Path Toner Cartridge Toner Cartridge Toner Cartridge 솔레노이드 솔레노이드 Fuser Fuser Fuser R1 : OPC Drum R7 : Feed Roller S1: Paper Empty(Cassette) Sensor R2 : Transfer Roller R8 : Pick-UP Roller S2: Paper Empty(MPF) Sensor R3 : Regi Roller R9 : Heat Roller S3: Regi Sensor...
  • Page 64 Alignment & Adjustments <Jam 2> <Jam Duplex 1> <Jam Duplex 2> • Simplex 1) A paper is fed from a cassette or MPF by a printing order. 2) The fed paper passes a paper feeding sensor. - If the sensor does not operate after feeding the paper, the Jam0 occurs. 3) The paper passes a paper exit sensor, and it comes out from a machine.

  • Page 65: Clearing Paper Jams

    Alignment & Adjustments 6.2.1 Clearing Paper Jams When a paper jam occurs,the display on the control panel shows the message indicating the corresponding location of the paper jam. 6.2.1.1 Tips for Avoiding Paper Jams By selecting the correct paper types, most paper jams can be avoided. If a paper jam occurs, follow the steps outlined in •...
  • Page 66 Alignment & Adjustments • In the Optional Tray2 1. Pull the optional Tray2 out of the printer. 3. If you cannot find the jammed paper in the Tray2,pull the Tray1 half way out of the printer,and remove the paper. 2. If you see the jammed paper,remove the paper from 4.
  • Page 67 Alignment & Adjustments 6.2.1.3 Around the Toner Cartridge (Jam1) 1. Open and close the top cover,and the jammed paper 4. Gently pull the jammed paper towards you to remove it should exit the printer. from the printer. If not,continue to Step 2. 2.
  • Page 68 Alignment & Adjustments 6.2.1.4 In the Paper Exit Area (Jam 2) 1. If a long portion of the paper is visible,pull it straight out. 3. Loosen the paper if it is caught in the feed rollers. Then If not,continue to Step 2. gently pull the paper out.
  • Page 69 Alignment & Adjustments 6.2.1.5 In the Duplex Area • Duplex Jam 1 1. Open the rear output tray. 3. Close the rear output cover. 2. Remove the jammed paper. 4. Open and close the top cover.Printing can be resumed. • Duplex Jam 2 1.

  • Page 70: Sample Pattern

    Alignment & Adjustments 6.3 Sample Pattern This product has the several sample patterns for maintenance. With the sample patterns, check the existence of the abnor- mality. The patterns help to regularly maintain the product. 6.3.1 Printing a Demo Page Print a demo page to make sure that the printer is operating correctly. 1.
  • Page 71 Alignment & Adjustments 6.3.3 Checking the toner cartridge count Information about the 'toner cartridge count' can be checked by printing the Configuration Sheet. 6.3.3.1 Remaining Toner : xx% - Contents : Shows the remaining amount of toner. - Description : It starts with 100%, and it reduces every 5% unit until it becomes 0%. (A message "Low Toner"...
  • Page 72 Alignment & Adjustments 6.3.3.5 A checking method of a toner remaining amount (1) Check a configuration sheet. (2) Check by using a key of a set. (Setup-maintenance-remain toner) (3) Check with a network : Check on a Webthru (Setup Menu-remaining toner) Caution (1) Please be careful not to damage a toner sensor part when assembling and...

  • Page 73: Consumables And Replacement Parts

    Alignment & Adjustments 6.4 Consumables and Replacement Parts The cycle period outlined below is a general guideline for maintenance. The example list is for an average usage of 50 transmitted and received documents per day. Environmental conditions and actual use will vary these factors. The cycle period given below is for reference only.

  • Page 74: Periodic Defective Image

    Alignment & Adjustments 6.5 Periodic Defective Image If the delinquent image regularly occurs in the printed-paper, it is due to delinquent or damaged roller. Refer to the table in below and check the condition of the roller. Roller Defective image Typical defect OPC Drum 95 mm...
  • Page 75 Alignment & Adjustments Service Manual 6-20...

  • Page 76: Troubleshooting

    TROUBLESHOOTING 7. Troubleshooting 7.1 The cause and solution of Bad image 7.1.1 Vertical Black Line and Band 1. Straight thin black vertical line occurs in the printing. • Description 2. Dark black vertical band occur in the printing. Check and Cause Solution Digital Printer 1.

  • Page 77: Horizontal Black Band

    TROUBLESHOOTING 7.1.3 Horizontal Black Band 1. Dark or blurry horizontal stripes occur in the printing periodically. • Description (They may not occur periodically.) Check and Cause Solution Digital Printer 1. Bad contacts of the voltage terminals to 1. Clean each voltage terminal of the Charge, Digital Printer toner cartridge.

  • Page 78: Light Image

    TROUBLESHOOTING 7.1.5 Light Image • Description The printed image is light, with no ghost. Check and Cause Solution Digital Printer 1. Develop roller is stained when the toner 1. Check if the Toner Save mode is off. Digital Printer of toner cartridge is almost consumed. Digital Printer Digital Printer 2.

  • Page 79: Uneven Density

    TROUBLESHOOTING 7.1.7 Uneven Density • Description Print density is uneven between left and right. Check and Cause Solution 1. The pressure force on the left and right 1. Replace both the left and right Spring springs of the transfer roller is not even, Holder.
  • Page 80 TROUBLESHOOTING 7.1.9 Ghost (1) • Description Ghost occurs at 95 mm intervals of the OPC drum in the whole printing. Check and Cause Solution Digital Printer 1. Bad contacts caused by contamination 1. Clean the terminals when contaminated by Digital Printer from toner particles between high voltage toner particles.
  • Page 81 TROUBLESHOOTING 7.1.11 Ghost (3) : Fuser • Description Ghost occurs at 82 or 92 mm intervals. Check and Cause Solution Digital Printer Digital Printer The temperature of the fuser is maintained 1. Disassemble the fuser and remove the high. contaminated toner particles on the roller Digital Printer and clean the foreign matter between Digital Printer...
  • Page 82 TROUBLESHOOTING 7.1.13 Satins on Back of Page • Description The back of the page is stained at 57 or 92 mm intervals. Check and Cause Solution Digital Printer Digital Printer 1. 57mm : Transfer roller is contaminated. 1. Perform the OPC Cleaning Mode Print 2 or 3 times.

  • Page 83: The Cause And Solution Of The Bad Discharge

    TROUBLESHOOTING 7.2 The cause and solution of the bad discharge 7.2.1 Wrong Print Position • Description Printing begins at wrong position on the paper. Check and Cause Solution Wrong sense time caused by defective feed sensor Replace the defective actuator actuator.
  • Page 84 TROUBLESHOOTING 7.2.3 JAM 1 1. Recording paper is jammed in front of or inside the fuser. • Description 2. Recording paper is stuck in the discharge roller and in the fuser just after passing through the Actuator-Feed. Check and Cause Solution 1.
  • Page 85 TROUBLESHOOTING 7.2.5 JAM Duplex 1 • Description A message 'Jam duplex 1' is displayed in a LCD window. Check and Cause Solution 1. It is a case when a paper can- 1. Replace a SMPS or main PBA not operate a duplex sensor. 2.
  • Page 86 TROUBLESHOOTING 7.2.7 Multi-Feeding • Description Multiple sheets of paper are fed at once. Check and Cause Solution 1. Solenoid malfunction(the solenoid does not work 1. Replace the solenoid if necessary. properly): Perform EDC Mode. 2. Replace the Main PBA. 2. Pad-Friction is contaminated with foreign matter.(oil..) 3.

  • Page 87: Paper Rolled On The Opc Drum

    TROUBLESHOOTING 7.2.9 Paper rolled on the OPC Drum • Description Paper is rolled up in the OPC. Check and Cause Solution 1. Paper is too much thin. 1. Recommend to use normal paper. 2. The face of paper is curled. 2.

  • Page 88: The Cause And Solution Of The Malfunction

    TROUBLESHOOTING 7.3 The cause and solution of the malfunction 7.3.1 Fuser Error • Description A message "Open fuser/Over heat/Low heat' is displayed in a LCD panel. Check and Cause Solution 1. Check whether a thermostat, AC wire, and heat 1. Replace the fuser if a thermostat is open. lamp are open or not.

  • Page 89: Paper Empty

    TROUBLESHOOTING 7.3.3 Not function of the gear of the fuser due to melting away • Description The motor breaks away from its place due to gear melting away. Check and Cause Solution 1. Check the Heat Lamp. 1. Replace the Fuser. 2.

  • Page 90: Paper Empty Without Indication

    TROUBLESHOOTING 7.3.5 Paper Empty without indication • Description The paper lamp on the operator panel does not come on when the paper cassette is empty. Check and Cause Solution 1. Bending or deformation of the actuator of the paper sen- 1.
  • Page 91 TROUBLESHOOTING 7.3.7 No error message when the cover is open • Description The ERROR message does not come on even when the printer cover is open Check and Cause Solution 1. Check the connector and circuit of the cover switch 1.

  • Page 92: Defective Motor Operation

    TROUBLESHOOTING 7.3.8 Defective motor operation • Description Main motor is not driving when printing, and paper does not feed into the printer, resulting 'Jam 0'. Check and Cause Solution 1. The Motor harness or Motor PCB may be defective. 1. Check the motor harness, replace it, if defective. 2.

  • Page 93: Vertical Line Getting Curved

    TROUBLESHOOTING 7.3.10 Vertical Line Getting Curved • Description When printing, vertical line gets curved. Check and Cause Solution 1. If the supply of +24v is unstable in the Main Control board 1. Replace LSU. linking with LSU, check drive by EDC Mode: LSU Check. 2.
  • Page 94 TROUBLESHOOTING 7.4 Toner Cartridge Service It is not guaranteed for the default caused by using other toner cartridge other than the cartridge supplied by the Samsung Electronic or caused by non-licensed refill production. 7.4.1 Precautions on Safe-keeping of Toner Cartridge Excessive exposure to direct light more than a few minutes may cause damage to the cartridge.

  • Page 95: Low Toner

    TROUBLESHOOTING 7.4.4 Error message (LCD window) related in a toner sensor It explains a message related in toner sensor in a LCD. 7.4.4.1 Invalid Toner - Contents: It is displayed when a supplier is different between a developer and a set. If this message is shown up, a printing process cannot operate.
  • Page 96 TROUBLESHOOTING 7.4.5 Signs and Measures at Poor toner cartridge Fault Signs Cause & Check Solution Light image and • The printed image 1. If the image is light or unclean 1. All of 1, 2, 3 above- partially blank is light or unclean and untidy printed image - If it become better by shaking, image...
  • Page 97 TROUBLESHOOTING Fault Signs Cause & Check Solution 1. If light or dark periodical black White Black spot • Light or dark black 1. In case of 1 above - dots occur, this is because the dots on the image Run OPC Cleaning Mode Print toner cartridge rollers are cont- occur periodically.
  • Page 98 TROUBLESHOOTING Fault Signs Cause & Check Solution Ghost & Image • The printed image 1. The printed image is too light 1. All of 1, 2, 3 above Contamination is too light or dark, or dark, or partially contami- (1)Remove toner and foreign sub- or partially contami- nated black.

  • Page 99: The Cause And Solutions Of Bad Environment Of The Software

    TROUBLESHOOTING 7.5 The cause and solutions of bad environment of the software 7.5.1 The printer is not working (1) • Description While Power turned on, the printer is not working in the printing mode. Check and Cause Solution 1. Run Self-Test Mode: Turn the power on while pressing 1.Check the power of the printer and perform the Self- the test printing button for 2 or 3 seconds before printing Test.
  • Page 100 TROUBLESHOOTING 7.5.2 The printer is not working (2) After receiving the printing order, no response at all or the low speed of printing • Description occurs due to wrong setup of the environment rather than malfunction of the printer itself. Check and Cause Solution 1.

  • Page 101: Abnormal Printing

    TROUBLESHOOTING 7.5.3 Abnormal Printing The printing is not working properly even when the cable has no problem. (even after the cable is replaced) • Description If the printer won't work at all or the strange fonts are repeated, the printer driver may be defec- tive or wrong setup in the CMOS Setup.

  • Page 102: Spool Error

    TROUBLESHOOTING 7.5.4 SPOOL Error To spool which stands for "simultaneous peripheral operations online" a computer document or task list (or "job") is to read it in and store it, usually on a hard disk or larger storage medium so • Description that it can be printed or otherwise processed at a more convenient time (for example, when a printer is finished printing its current document).
  • Page 103 TROUBLESHOOTING Service Manual 7-28...

  • Page 104: Exploded Views And Parts List

    EXPLODED VIEW & PARTS LIST 8. Exploded Views and Parts List 8.1 Main Assembly ......... . page(8-2) 8.2 Base-Houshing Assembly .

  • Page 105: Main Assembly

    EXPLODED VIEW & PARTS LIST 8.1 Main Assembly 24-2 24-3 24-1 24-4 25-1 25-2 25-3 41-2 27-1 27-2 27-3 41-1 14-2 14-3 14-1 Service Manual...
  • Page 106 EXPLODED VIEW & PARTS LIST Main Assembly Parts List SA : Service Available O : Service available X : Service not available Description SEC.Code Q’ty Remark ELA HOU BASE-HOUSHING JC96-02695P ELA UNIT-COVER MP JC96-02679E COVER-M-MP JC63-00127E TRAY-M-EXTEND MP JC63-00128B ELA UNIT-KNOCK UP MP JC96-02680B PLATE-M-KNOCK UP MP JC61-00686B...
  • Page 107 EXPLODED VIEW & PARTS LIST Main Assembly Parts List SA : Service Available O : Service available X : Service not available Description SEC.Code Q’ty Remark ELA UNIT-HOLDER TR L JC96-01730A 25-1 PMO-BUSHING TR JC72-41142A 25-2 SPRING ETC-TR L HAWK JC61-00047A 25-3 PMO-TRANSFER HOLDER L...

  • Page 108: Base-Houshing Assembly

    EXPLODED VIEW & PARTS LIST 8.2 Base-Houshing Assembly 1-3-11 1-3-2 1-3-3 1-3-4 1-3-5 1-3-1 1-3-6 1-3-3 1-3-12 1-3-10 1-3-7 1-3-9 1-1-4 1-1-3 1-3-10 1-1-1 1-3-8 1-1-2 1-2-1 1-2-2 Dine Screw Service Manual...
  • Page 109 EXPLODED VIEW & PARTS LIST Base-Houshing Assembly Parts List SA : Service Available O : Service available X : Service not available Description SEC.Code Q’ty Remark ELA HOU BASE-HOUSHING JC96-02695P ELA UNIT-COVER TOP JC96-02696L AS-PBA LCD PNL_KB JC81-01731A 1-1-1 KEY-M-BUTTON JC64-00082A 1-1-2 PBA MAIN_LCD PANEL...

  • Page 110: Frame Assembly (0 ~ 37)

    EXPLODED VIEW & PARTS LIST 8.3 Frame Assembly (1) Service Manual...

  • Page 111: Frame Assembly (37 ~ 71)

    EXPLODED VIEW & PARTS LIST Frame Assembly (2) Service Manual...
  • Page 112 EXPLODED VIEW & PARTS LIST Frame Assembly Parts List SA : Service Available O : Service available X : Service not available Description SEC.Code Q’ty Remark ELA UNIT-FRAME BASE JC96-02627C 110V ELA UNIT-FRAME BASE JC96-02627D 220V FRAME-M-BASE JC61-00677A ELA UNIT-PICKUP MP JC96-02681A SHAFT-M-PICK UP MP JC66-00453A...
  • Page 113 EXPLODED VIEW & PARTS LIST Frame Assembly Parts List SA : Service Available O : Service available X : Service not available Description SEC.Code Q’ty Remark AS-ROLLER EXIT_DUPLEX JC81-01732A IPR-TERMINAL TR HAWK JC70-00132A CAP-M-WIRE PTL LOWER JC67-00036A PBA SUB-PTL2 JC92-01516A CBF HARNESS-THERMISTOR JC39-00255A TERMINAL-P_PTL...
  • Page 114 EXPLODED VIEW & PARTS LIST Frame Assembly Parts List SA : Service Available O : Service available X : Service not available Description SEC.Code Q’ty Remark CBF HARNESS-HVPS JC39-00247A CBF HARNESS-CONNECTOR JC39-00259A CBF HARNESS-SENSOR JC39-00261A ELA UNIT-PICK UP JC96-02683A 67-1 FRAME-M-PICKUP JC61-00641A 67-2...

  • Page 115: Fuser Assembly

    EXPLODED VIEW & PARTS LIST 8.4 Fuser Assembly 1-19 1-13 1-11 1-12 1-20 1-15 1-18 1-15 1-18 1-17 1-16 1-14 1-10 1-16 1-14 1-10 1-17 Service Manual 8-12...
  • Page 116 EXPLODED VIEW & PARTS LIST Fuser Unit Assembly Parts List SA : Service Available O : Service available X : Service not available Description SEC.Code Q’ty Remark ELA UNIT-FUSER JC81-01728A 110V ELA UNIT-FUSER JC81-01729A 220V ELA UNIT-UPPER FUSER JC96-02694A THERMISTOR-NTC 1404-001305 SCREW-MACHINE 6001-000131...
  • Page 117 EXPLODED VIEW & PARTS LIST Fuser Unit Assembly Parts List SA : Service Available O : Service available X : Service not available Description SEC.Code Q’ty Remark MEA UNIT-BRK GEAR FU JC97-01720A RING-E 6044-000231 BRACKET-P-FUSER JC61-00617A GEAR-IDLE 33 JC66-00425A GEAR-IDLE 23 JC66-00426A LAMP-HALOGEN 4713-001186...

  • Page 118: Main Driver Assembly

    EXPLODED VIEW & PARTS LIST 8.5 Main Driver Assembly Harness-Main Motor Main Driver Assembly Parts List SA : Service Available O : Service available X : Service not available Description SEC.Code Q’ty Remark ELA UNIT-MOTOR MAIN CARDINAL JC96-02725B MOTOR DC-BLDC CARDINAL JC31-00024A BRACKET-P-MAIN JC61-00622A...

  • Page 119: Exit Driver Assembly

    EXPLODED VIEW & PARTS LIST 8.6 Exit Driver Assembly Harness-Motor Exit Drive Assembly Parts List SA : Service Available O : Service available X : Service not available Description SEC.Code Q’ty Remark ELA UNIT-MOTOR EXIT CARDINAL JC96-02857A MOTOR-STEP-CARDINAL 2 JC31-00028C PMO-IMPELLER_DRV JC72-00825A BRACKET-P-EXIT...

  • Page 120: Regi Assembly

    EXPLODED VIEW & PARTS LIST 8.7 Regi Assembly Regi Assembly Parts List SA : Service Available O : Service available X : Service not available Description SEC.Code Q’ty Remark ELA UNIT-REGI JC96-02626A GUIDE-P_REGI LOWER JC61-00674A ROLLER-REGI LOWER L JC66-00450A SHAFT-REGI UPPER JC66-00446A ROLLER-M-REGI IDLE S JC66-00648A...

  • Page 121: Smps Assembly

    EXPLODED VIEW & PARTS LIST 8.8 SMPS Assembly 2-15 2-12 2-14 2-13 2-10 2-14 2-11 Service Manual 8-18...
  • Page 122 EXPLODED VIEW & PARTS LIST SMPS Assembly Parts List SA : Service Available O : Service available X : Service not available Description SEC.Code Q’ty Remark ELA HOU-SMPS_HVPS_V1(110V) JC96-02779A 110V ELA HOU-SMPS_HVPS_V2(220V) JC96-02777A 220V SMPS-V1_HVPS JC44-00052A 110V SMPS-V2_HVPS JC44-00053A 220V MEA UNIT-DUPLEX JC97-01714A GUIDE-M-LEFT, DUP...

  • Page 123: Cassette Assembly

    EXPLODED VIEW & PARTS LIST 8.9 Cassette Assembly Service Manual 8-20...
  • Page 124 EXPLODED VIEW & PARTS LIST Cassette Assembly Parts List SA : Service Available O : Service available X : Service not available Description SEC.Code Q’ty Remark ELA UNIT-CASSETTE(550) JC96-02687B FRAME-M-CASSETTE JC61-00642B GUIDE-M-HANDLE JC61-00655B LABEL(R)-CASSETTE JC68-01031A GUIDE-M-INNER CST JC61-00704A HOLDER-M-INDICATOR JC61-00639A INDICATOR-M-EMPTY JC64-00041B GUIDE-M-EXTENSION CST...

  • Page 125: Scf Assembly

    EXPLODED VIEW & PARTS LIST 8.10 SCF Assembly 35-2 35-3 35-1 18-3 18-4 18-5 18-2 18-1 10-1 10-2 18-6 10-3 10-5 10-4 Service Manual 8-22...
  • Page 126 EXPLODED VIEW & PARTS LIST SCF Assembly Parts List SA : Service Available O : Service available X : Service not available Description SEC.Code Q’ty Remark MEA UNIT-SECOND FEEDER JC96-02842B PMO-FRAME SCF JC61-00643B MEA UNIT-PICK UP JC96-02683A HOUSING-PICK UP JC61-00636A RUBBER-PICK UP JC73-00127A SPRING-PICK UP...
  • Page 127 EXPLODED VIEW & PARTS LIST SCF Assembly Parts List SA : Service Available O : Service available X : Service not available Description SEC.Code Q’ty Remark SCREW-TAPTITE 6003-000196 SCREW-TAPTITE 6003-000259 SCREW-MACHINE 6001-000131 RING-E 6044-000231 RING-E 6044-000125 Service Manual 8-24...

  • Page 128: Block Diagram

    BLOCKDIAGRAM 9. Block Diagram 100PI N DI M M 29L V160 16Mbit Flash M emory DA T A (16:31) Mask Font ROM Regulat or AD DR(1: 23) 1.8V U SB c loc k 12M H z(OSC) RCS(0:3) FS781 Sy s tem c l ock Fr eq ue nc y Sca lin g E MI 1 2M Hz( X- t al )
  • Page 129 BLOCKDIAGRAM Service Manual...

  • Page 130: Connection Diagram

    CONNECTION DIAGRAM 10. Connection Diagram Service Manual 10-1...
  • Page 131 CONNECTION DIAGRAM Service Manual 10-2...

  • Page 132: Circuit Description

    11. Circuit Description 11.1 Engine Specification 11.1.1 General Specification Item Specification & Descriptions Remark 1. Engine Phaser 3450 2. Type Desktop 3. Print Speed 24 PPM (A4 Size,5% Character Pattern) At Copy Mode 4. Resolution 1200 X 1200 DPI addressable 5.
  • Page 133 CIRCUIT DESCRIPTION Item Specification & Descriptions Remark 20.Reliability MPBF : 150,000 pages MTTR : 30 min. 21.Toner Cartridge SAMSUNG- Toner Cartridge 22.Expected Life Span 400,000 pages or 5 years (whichever comes first, A4, 5%) 23.Operating Environment Temperature : 10 ~ 32.5°c Humidity : 20 ~ 80% 24.Storage Environment...
  • Page 134 CIRCUIT DESCRIPTION 11.1.2 Quality Specification Item Specification & Descriptions Remark 1. Conditions Paper Core Media List 75g/m Environment Temperature : 15 ~ 25°C Temperature Humidity : 40 ~ 60% 2. Print Quality Optical Density -Avr. 1.30 (Temperature : 15 ~ 25°C) : After 1hr.
  • Page 135 CIRCUIT DESCRIPTION 11.1.3 Maintenance Item Specification & Descriptions Remark 1.Toner Saving -.Using the DRAFT printing -.62% 2.Density Adjustment Normal, Dark,Light 3.Power Save Time OFF,15,30,45,60 minutes selectable 4.Installing the Printer 1) Unpack the box. 2) Get the new image cartridge out of its bag. And then remove the plastic strip from the cartridge.

  • Page 136: System Configuration

    CIRCUIT DESCRIPTION 11.2 System Composition 11.2.1 System Configuration 11.2.1-1 Video Controller Board Video Controller Board receives image data from the Host Computer then convert into Bitmap (Binary) image or directly receive Bitmap image from the Host and connect to the input/output section to process data and print out the created image.

  • Page 137: Development Process

    CIRCUIT DESCRIPTION 11.2.2 Development Process 11.2.2.1 Paper Feed Paper feed unit is operated by the engine and solenoid rotates the feed roller to feed one sheet of paper. The paper then moves on to the set and hits the actuator of the feed sensor.
  • Page 138 CIRCUIT DESCRIPTION < Engine Operating Description > metering blade -650V -470V Develop Block HOST COMPUTER VIDEO CONTROLLER ENGINE CONTROLLER /HSYNC FACE DOWN H.V.P.S STACKER DEVELOPER FUSER PAPER PATH FEED EXIT FACE SENSOR SENSOR [ Fig1 ] System OPerating Structure Service Manual 11-7...

  • Page 139: Development Section

    CIRCUIT DESCRIPTION < Engine Operating Description > 2.Charging 3.Exposure 4.Development 7.Fixing 8.Exit 1.Feeding EXIT FEED SENSOR SENSOR 6.Transfer 5.Pre-Transfer [ Fig 2 ] 11.2.2.4 Development Section From the contact surface where OPC drum and the Developer Roller rotate in opposite direction, Toner with it's (-) electric characteristics transfers to the exposed part (-150V) of the OPC drum due to the electric potential difference.
  • Page 140 CIRCUIT DESCRIPTION 11.2.2.6 Printing Section The toner on the surface of a paper, which passed the transfer section is at a low electric state. Therefore, it can easily spread. At this point, high temperature of 180°C and pressure of 4.5 Kg are applied to permanently stick the toner to the paper.
  • Page 141 CIRCUIT DESCRIPTION 11.2.3 Engine/SMPS Section SMPS(Switching Mode Power Supply) is the PWM(Pulse Width Modulation) method of power supply unit that supplies DC+3.3V, DC+5Vand DC+24V to the engine and DC+3.3V, DC+5V to the video controller and the assembly panel. It also supplies AC voltage to the heat lamp of the printing section.
  • Page 142 CIRCUIT DESCRIPTION 11.2.3.3 Circuit 1) AC Input and DC The current then flows into PC1(PHOTO COUPLER) to AC input unit is composed of FUSE, VARISTOR, NOISE bypass the IC1 feedback. Then, U1 turns on. Through CAPACITOR and LINE FILTER. DC unit is composed of such repetitious process, the current flowing through 2nd BRIDGE DIODE and ELECTRIC CAPACITOR.

  • Page 143: Sensor Input Circuit

    CIRCUIT DESCRIPTION 11.2.3.4 Sensor Input Circuit 1) Paper Empty Sensing 8) Cassette Sensing(micro switch) The Paper Empty Sensor(Photo Interrupter), which is By U27 K25pin, cassette detecting function checks located in the Engine Board informs the CPU the status whether tray2 is open or not. When Tray2 is open, LCD of paper volume through the operation of actuator fixed panel displays error status.
  • Page 144 CIRCUIT DESCRIPTION 11.2.3.5 Output Control Circuit 1) Main / Sub Fan Main Fan and Sub Fan are in-take-type. Main Fan is off in sleep mode, and Sub Fan operates when printing to control temperature of inside SMPS. Main Fan is controlled by TR of Q10 by receiving signal from U18 18pin, and Sub Fan becomes chopping by signal of U18 20pin and controlled by TR of Q12.
  • Page 145 CIRCUIT DESCRIPTION 11.2.4 Video Controller 11.2.4.1 Power On Reset Circuit Reset circuit initializes PPC(U26) and SPGPi(U27) when the power turns on and prevents unstable CPU operation until the power reaches standard level. This circuit is composed of R-C circuit, which decides the value of XC61FN3112MR(U20) Reset IC and Reset time.

  • Page 146: Memory Circuit

    CIRCUIT DESCRIPTION 11.2.4.5 Sensing Circuit 1) Cover Open Sensing Cover Open Sensor is located on the top right side of the Cover Open Board. When the front cover opens, it shuts off +24V(DC fan, Solenoid, Main Motor, LSU Polygon Motor and HVPS) supplied to each unit. B2 Bit of U4 senses cover open by sensing the developing section with B111 Bit of U18.
  • Page 147 CIRCUIT DESCRIPTION 11.2.4.11 PTL Circuit PTL circuit is located in the Video Controller Board and applies NPN type TR for drive 11.2.4.12 Panel Circuit Panel is consisted of 2*16 LCD(with back lite), 1 LED, and 6 keys. It has HT48C5A that is 8bit I/O control MCU, it supplies clock (7.37MHz), and it controls data with CPU by UART method.
  • Page 148 CIRCUIT DESCRIPTION 11.2.5 H.V.P.S. (High Voltage Power Supply) 11.2.5.1 Introduction HVPC applies DC+24V/ DC+5V, which is used to form image in the electric photo development process of OAequipments. It yields MHV, SUPPLY, DEV, and THV. 11.2.5.2 Electric Photo Process Electric photo process is widely used to the image creation features of copying machines, laser beam printers and facsimiles.
  • Page 149 CIRCUIT DESCRIPTION 11.3.1 Introduction HVPC applies DC+24V/ DC+5V, which is used to form image in the electric photo development process of OAequipments. It yields MHV, SUPPLY, DEV, and THV. Each high pressure output indicate the voltage required for the electric photo process. 11.3.2 Electric Photo Process Electric photo process is widely used to the image creation features of copying machines, laser beam printers and facsimiles.
  • Page 150 CIRCUIT DESCRIPTION 11.3.3 Composition HVPS is composed of electric charge printing section, BIAS printing section and transfer printing section. 1) Input section 2) Electric charge printing(ENABLE) section : MHV(MAIN HIGH VOLTAGE) 3) BIAS printing (ENABLE)section : DEV(DEVELOPMENT VOLTAGE)/SUPPLY(SUPPLY VOLTAGE) 4) Transfer ‘+’ printing (ENABLE)section : THV(+)(TRANSFER HIGH VOLTAGE(+)) 5) Transfer ‘-’...
  • Page 151 CIRCUIT DESCRIPTION 11.3.3.3 BLOCK-DIAGRAM of Transfer Printing Section THVPWM SWITCHING REGULATION CONTROL CONTROL TRANS CIRCUIT UNIT UNIT FEEDBACK SWITCHING THVEA REGULATION CONTROL TRANS CIRCUIT UNIT THVREAD FEEDBACK THV CIRCUIT Service Manual 11-20...
  • Page 152 CIRCUIT DESCRIPTION 11.4 High Pressure Printing 11.4.1 MHV (Electric Charge Printing Section) Charging output of ENABLE is 'MHV-PWM LOW ACTIVE', which is charging output controlling signal. When MHV-PWM signal is applied, regular voltage flows to OP-AMP non-inverting terminal via filter R401, C401, R402, and C402. It becomes HIGH or LOW in comparison with feedback voltage which flows to OP-AMP inverting terminal.
  • Page 153 CIRCUIT DESCRIPTION 11.4.2 DEV/SUPPLY DEV /SUPPLY have same circuit construction and same driving condition with MHV. Type 1 is a composition for driving DEV and Supply at the same type with one high trans, and type2 is a composition for driving each bias with two trans. Type 1 ZD501 24V1...
  • Page 154 CIRCUIT DESCRIPTION 11.4.3 THV(THV(+) / THV(-) Section) Transfer (+) output enable is 'THV-PWMLOW ACTIVE', transfer output controlling signal. When THV-PWMLOW signal is applied, Q201 turns on, and regular voltage flows to OP-AMP non-inverting terminal via filter R;204 C201, R205, and C202. It becomes HIGH or LOW in comparison with feedback voltage which flows to OP- AMP inverting terminal.
  • Page 155 CIRCUIT DESCRIPTION 11.4.4 Environment THV voltage recognizes the change in the transfer roller environment and then supplies optimum voltage for the environment to create optimum image. Analog data is converted to digital by the environment sensor of the transfer roller. According to such digital output stored in the program in the engine controller Rom, and with the consideration of the paper type printing environment, optimum transfer voltage is supplied.

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