Kyocera FS-6950DN Service Manual
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Kyocera FS-6950DN Service Manual

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FS-6950DN
SERVICE
MANUAL
Published in January 2007
842F7115
2F7SM065
Rev.5

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Summary of Contents for Kyocera FS-6950DN

  • Page 1: Service Manual

    FS-6950DN SERVICE MANUAL Published in January 2007 842F7115 2F7SM065 Rev.5...
  • Page 2 CAUTION RISK OF EXPLOSION IF BATTERY IS REPLACED BY AN INCORRECT TYPE. DISPOSE OF USED BATTERIES ACCORDING TO THE INSTRUCTIONS. It may be illegal to dispose of this battery into the municipal waste stream. Check with your local solid waste officials for details in your area for proper disposal. ATTENTION IL Y A UN RISQUE D’EXPLOSION SI LA BATTERIE EST REMPLACEE PAR UN MODELE DE TYPE INCORRECT.

  • Page 3: Revision History

    Revision history Revision Date Replaced pages Remarks February 22, 2006 1-1-1, 1-1-2, 1-2-1, 1-3-6, 1-3-14, 1-4-4, 1-4-5, 1-4-11, 2-1-7, 2-4-2 August 4, 2006 1-2-3, 1-2-6, 1-2-8, 1-3-5, 1-3-6, 1-3-8, 1-4-6, 1-4-9, 1-5-1, 1-5-2, 1-5-25, 1-5-26, 1-5-28, 1-5-29, 1-6-5, 2-1-13, 2-2-1, 2-2-2, 2-3-3, 2-4-1 September 11, 2006 1-3-14, 1-5-12, 1-5-13 November 28, 2006...
  • Page 4 This page is intentionally left blank.

  • Page 5: Safety Precautions

    Safety precautions This booklet provides safety warnings and precautions for our service personnel to ensure the safety of their customers, their machines as well as themselves during maintenance activities. Service personnel are advised to read this booklet carefully to familiarize themselves with the warnings and precautions described here before engaging in maintenance activities.
  • Page 6 Safety warnings and precautions Various symbols are used to protect our service personnel and customers from physical danger and to prevent damage to their property. These symbols are described below: DANGER: High risk of serious bodily injury or death may result from insufficient attention to or incorrect compliance with warning messages using this symbol.

  • Page 7: Installation Precautions

    1.Installation Precautions WARNING • Do not use a power supply with a voltage other than that specified. Avoid multiple connections to one outlet: they may cause fire or electric shock. When using an extension cable, always check that it is adequate for the rated current....................•...

  • Page 8: Precautions For Maintenance

    2.Precautions for Maintenance WARNING • Always remove the power plug from the wall outlet before starting machine disassembly....• Always follow the procedures for maintenance described in the service manual and other related brochures............................• Under no circumstances attempt to bypass or disable safety features including safety mechanisms and protective circuits.
  • Page 9 • Do not remove the ozone filter, if any, from the copier except for routine replacement..... • Do not pull on the AC power cord or connector wires on high-voltage components when removing them; always hold the plug itself...................... •...
  • Page 10 This page is intentionally left blank.
  • Page 11 CONTENTS 1-1 Specifications 1-1-1 Specifications............................1-1-1 1-1-2 Parts names............................1-1-3 (1) Overall ...............................1-1-3 (2) Operation panel..........................1-1-4 1-1-3 Machine cross section ..........................1-1-5 1-2 Installation 1-2-1 Installation environment ..........................1-2-1 1-2-2 Unpacking and installation ........................1-2-2 (1) Installation procedure ........................1-2-2 1-2-3 Installing the expanding memory (optional) ..................1-2-10 1-2-4 Installing the memory card or hard disk (optional) ................1-2-11 1-2-5 Installing the network interface card (optional) ..................1-2-12 1-3 Maintenance Mode...
  • Page 12 (2) Detaching and refitting the fuser heater lamp M and S ..............1-5-16 (3) Detaching and refitting the heat roller .....................1-5-18 (4) Detaching and refitting the press roller....................1-5-19 (5) Detaching and refitting the fuser thermistor M, fuser thermistor S and thermal cutout ....1-5-20 1-5-8 PWBs ..............................1-5-22 (1) Detaching and refitting the engine PWB ..................1-5-22 (2) Detaching and refitting the main PWB ....................1-5-26...

  • Page 13: Specifications

    2F7-1 1-1 Specifications 1-1-1 Specifications Printing method....... Semiconductor laser and electrophotography Printing speeds ....... Simplex: A3: 16 ppm A4: 32 ppm A5: 32 ppm Duplex: A3: 10 ppm A4: 23 ppm Paper sizes ........Paper cassette: A3, A4, A5, B4, B5, ledger, letter, legal, envelope C4, envelope C5, ISO B5, executive, oficio II, 8 kai, 16 kai, folio, and custom MP tray: A3, A4, A5, A6, B4, B5, B6, ledger, letter, legal, envelope monarch, envelope DL,...
  • Page 14 2F7-1 Weight (without toner container) ..19.5 kg/43 lbs Operating noise ......During printing: LpA = 50 dB (A) During standby: LpA = 40 dB (A) During sleep mode: Immeasurably low (In accordance with EN ISO7779 [Bystander position, sound pressure level at the front]) 1-1-2...
  • Page 15 1-1-2 Parts names (1) Overall Figure 1-1-1 Top cover 11. Waste toner box Paper stopper 12. Rear unit Top tray 13. USB memory connector Operation panel 14. USB interface connector Toner container 15. Network indicators Right side cover 16. Parallel interface connector Paper cassette 17.
  • Page 16 (2) Operation panel Ready PAR A4 PLAIN Figure 1-1-2 Message display Indicators Menu key OK key Cursor keys GO key Cancel key 1-1-4...
  • Page 17 1-1-3 Machine cross section Paper path Paper path (optional) Figure 1-1-3 Machine cross section Rear unit MP (Multi-Purpose) tray 10. Fuser unit MP tray paper feed unit 11. Transfer/separation section Toner container 12. Duplex paper conveying section Developer unit 13. Paper cassette Main charger unit 14.
  • Page 18 This page is intentionally left blank. 1-1-6...
  • Page 19 2F7-4 1-2 Installation 1-2-1 Installation environment ° ° Temperature: 10 to 32.5 C/50 to 90.5 Humidity: 15 - 80%RH Power supply: 120 V AC, 9.0 A 220 - 240 V AC, 5.0 A (Average) ± ± Power source frequency: 50 Hz 0.3%/60 Hz 0.3% Installation location...

  • Page 20: Unpacking And Installation

    1-2-2 Unpacking and installation (1) Installation procedure Start Unpacking. Attacihng the label. Installing the toner container and waste toner box. Adding paper to paper cassette. Connecting the printer cables. Connecting the power cord and toner installing. Printing a status page for test. Installing the software.
  • Page 21 2F7-4 Unpacking. Figure 1-2-2 Unpacking Printer Plastic bag Outer case 10. Installation guide etc. Bottom pad L 11. Plastic bag Bottom pad R 12. Toner container Machine cover 13. Power cord Top pad L 14. Waste toner box Top pad R 15.
  • Page 22 Attaching the label. 1. Attach the included language label sheet on the indicator as shown in the figure. Ready PAR A4 PLAIN Menu Language label sheet Figure 1-2-3 Installing the toner container and waste toner box. 1. Open the top cover. 2.
  • Page 23 3. Shake the new toner container at least 10 Toner container times as shown in the figure in order to dis- tribute the toner evenly inside the container. 4. Carefully remove the protective seal (orange colored). Protective seal REMOVE THIS TAG (orange colored) BEFORE ADDING TONER Figure 1-2-5...
  • Page 24 2F7-2 Adding paper to the paper cassette. 1. Pull out the paper cassette 2. Remove the two tapes and then remove the cassette cover. Tape 3. Push the bottom plate down until it locks. Tape Cassette cover Bottom plate Paper cassette Figure 1-2-8 4.
  • Page 25 5. Pull the release lever on the right side guide and slide to the desired paper size. Side guide Release lever Side guide Figure 1-2-10 6. Pull the release lever and slide the paper stopper to the desired paper size. If using A3 or Ledger paper, pull out the Lock lever extension paper cassettes pushing the lock...
  • Page 26 2F7-2 Connecting the printer cables. 1. Connect the printer cable (parallel, USB or network*) to the printer and the PC. *: Remove the cap. USB cable Network Parallel Network cable Parallel cable Figure 1-2-12 Connecting the power cord and toner installing. 1.
  • Page 27 Printing a status page for test. 1. Press the Menu key when [Ready] is dis- played. 2. Press key to display [Print Status Page]. 3. Press OK key to display [Print Status Page?]. 4. Press OK key. [Processing] will be displayed and the status page will be printed.
  • Page 28 1-2-3 Installing the expanding memory (optional) <Procedure> 1. Power off the printer and unplug the printer power cord. Right side cover 2. Open the right side cover 3. Remove the screw and open the inner cover. Inner cover Screw Figure 1-2-14 4.
  • Page 29 1-2-4 Installing the memory card or hard disk (optional) <Procedure> 1. Turn off the printer and disconnect the power cord and printer cable. 2. Remove the two screws and then open the option interface slot cover. 3. Install the memory card or hard disk into the memory card slot.
  • Page 30 1-2-5 Installing the network interface card (optional) <Procedure> 1. Turn off the printer and disconnect the power cord and printer cable. 2. Remove the two screws and then open the option interface slot cover. 3. Install the network interface card. 4.

  • Page 31: Maintenance Mode

    1-3 Maintenance Mode 1-3-1 Maintenance mode The printer is equipped with a maintenance function which can be used to maintain and service the machine. (1) Executing a maintenance item Message display Ready Press the MENU key. Print Menu Map Press the key several times until [Others >] is displayed.

  • Page 32: Toner Coverage

    2F7-4 Service items Description Printing a status page for service purpose Description Prints a status page for service purpose. The status page includes various printing settings >>Print and service cumulative. Status Page Purpose To acquire the current printing environmental parameters and cumulative information. Procedure Enter the service mode [>>Print Status Page].

  • Page 33: Service Information

    2F7-4 Service items Description Toner coverage Toner coverage (%) Number of pages printed coverted in reference to A4 or Letter size. Toner Coverage /12.1( Toner Coverage(%) Average)/165868.2 / 3.5( Toner Coverage(%) Last Page) Toner coverage (%) of the page printed most previously. Service information Service information [XXXXXXXX/XXXXXXXX][XXXXXXX][XXXXXXXX][01/00]...
  • Page 34 Service items Description /00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/ /00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/ /00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/ /00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/ /00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/ /00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/ /00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/ /00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/ /00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/ /00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/ /00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/ /00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/ /00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/ /00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/ /00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/ /00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/ /00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/ /00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/ /00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/ /00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/ /00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/ /00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/ /00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/00000000/ /8088808880808000/8088808880808000/8088808880808000/8088808880808000 /8088808880808000/8088808880808000/8088808880808000/8088808880808000 /8088808880808000/8088808880808000/8088808880808000/8088808880808000 /8088808880808000/8088808880808000/8088808880808000/8088808880808000 /8088808880808000/8088808880808000/8088808880808000/8088808880808000 /8088808880808000/8088808880808000/8088808880808000/8088808880808000 /8088808880808000/8088808880808000/8088808880808000/8088808880808000 /8088808880808000/8088808880808000/8088808880808000/8088808880808000 /00000000/00000000/00000000000000000000000000000000/00000000000000000000000000000000/0000/00/00 DN:SPL9200007 SN:SPL9200010 Detail of service information Items Description Engine ROM information...
  • Page 35 1 = 0: Overseas, 1: Domestic (Japan) [First byte/Second byte bit 2, 3 (Not used) (displayed in OEM model bit 4 = 0: Kyocera, 1: OEM only)] bit 5 = 0: For Europe, 1: For US bit 6 = 0: Non MICR mode, 1: MICR mode...
  • Page 36 2F7-2 Service items Description Items Description Paper source position counter /Duplex Unit life counter /Drum unit Maintenance kit life counter Unit version /Paper feeder 1/Paper feeder 2/Paper feeder 3/Paper feeder 4/ Unit EEPROM error bit0: Paper feeder 1 bit1: Paper feeder 2 bit2: Paper feeder 3 bit3: Duplex bit4 to 6: Reserved...
  • Page 37 Service items Description Items Description LSU luminous power distribu- APC PWB table information (1 byte)/actual data (32 bytes) tion information × × DRT correction coefficient 4 bytes 23 groups Engine parameter Hexadecimal, 128 bytes (256 digits) Toner container information Drum serial number Machine serial number NOTE: Code conversion...
  • Page 38 2F7-4 Service items Description Printing an event log (EVENT LOG) Description >>Print Prints the history of paper misfeeds and self-diagnostic errors including up to 16 items from Event Log the latest occurrence of such an error. (If the number of errors exceeds 16, errors will be deleted sequentially from the oldest one.) Purpose To allow machine malfunction analysis based on the frequency of paper misfeeds and self...
  • Page 39 [First byte/Second byte (dis- bit 2, 3 (Not used) played in OEM mode only)] bit 4 = 0: Kyocera, 1: OEM bit 5 = 0: For Europe, 1: For US bit 6 = 0: Non MICR mode, 1: MICR mode...
  • Page 40 Service items Description Items Description (10) (a) Cause of paper jam cont. 10: Paper does not arrive at the registration sensor. (MP tray) [42] 10: Paper does not arrive at the registration sensor. (Cassette 1) [31] 10: Paper does not arrive at the registration sensor. (Cassette 2) [31] 10: Paper does not arrive at the registration sensor.
  • Page 41 Service items Description Items Description (10) (b) Detail of jam location cont. Printer (Face down tray) (Face down tray) (Face down tray) (MP tray) (Inside the printer) (Inside the printer) (Inside the printer) (Fuser) (Fuser) (Fuser) (Rear unit) (Rear unit) (Rear unit) (Duplex conveying) (Duplex conveying)
  • Page 42 Service items Description Items Description (10) (c) Detail of paper source (Hexadecimal) cont. 00: MP tray 01: Paper cassette 1 (printer) 02: Paper cassette 2 (paper feeder 1) 03: Paper cassette 3 (paper feeder 2) 04: Paper cassette 4 (paper feeder 3) 05: Paper cassette 5 (paper feeder 4) 06 to 09: Reserved (d) Detail of paper size (Hexadecimal)
  • Page 43 2F7-4 Service items Description Items Description (11) Service Call (Self Count. Service Code diagnostic error) Remembers 1 to 8 of occur- The total page count at the Self diagnostic error code rence of self diagnostics time of the self diagnostics error.
  • Page 44 2F7-3 Service items Description Setting the paper feed operation (printer driver priority mode) Description >>Paper Feed With printer driver priority mode, when selecting the specific paper feed location (a paper cassette or MP tray) with the printer driver (it is not automatic selection), paper is fed from the selected location.
  • Page 45 Service items Description Initializing the developer unit (toner install mode) Description The new developer unit is shipped from the factory with no toner contained. The developer >>Developer can be automatically replete with toner when a toner container is installed onto it and the printer is turned on.
  • Page 46 Service items Description Drum surface refreshing Description Rotates the drum approximately 3 minutes with toner lightly on the overall drum using the >>Drum high-voltage output control of the engine PWB. The cleaning blade in the drum unit scrapes toner off the drum surface to clean it. Purpose To clean the drum surface when image failure occurs due to the drum.

  • Page 47: Paper Misfeed Detection

    1-4 Troubleshooting 1-4-1 Paper misfeed detection (1) Paper misfeed indication When a paper misfeed occurs, the printer immediately stops printing and displays the paper misfeed message on the operation panel. To remove paper misfed in the printer, pull out the paper cassette, pull out the rear unit, remove the devel- oper unit or open the duplex cover.
  • Page 48 1-4-2 Self-diagnostic function (1) Self-diagnostic function This printer is equipped with self-diagnostic function. When a problem is detected, the printer stops printing and display an error message on the operation panel. An error message consists of a message prompting a contact to service personnel, total print count, and a four-digit error code indicating the type of the error.
  • Page 49 Remarks Code Contents Causes Check procedures/corrective measures 2000 Main motor error Defective harness Reinsert the connector. Also check for conti- MMOTRDYN signal does not go low between main nuity within the connector harness. If none, within 2 s after MMOTONN signal goes motor and engine remedy or replace the harness.
  • Page 50 2F7-5 Remarks Code Contents Causes Check procedures/corrective measures 4200 Laser output (pin photo sensor) error Defective harness Reinsert the connector. Also check for conti- The pin photo signal (PDN) is not output between PD PWB nuity within the connector harness. If none, within a specified time after the polygon (YC1) and main remedy or replace the harness.
  • Page 51 2F7-5 Remarks Code Contents Causes Check procedures/corrective measures 6030 Broken fuser thermistor M wire Poor contact in the Reinsert the connector (See page P.1-5-20). Input from fuser thermistor M is less than fuser thermistor M 1 (A/D value) for more than 3 s. connector termi- nals.
  • Page 52 2F7-5 Remarks Code Contents Causes Check procedures/corrective measures 7000 Toner motor lock error Lump of toner Replace the toner container. A motor over-current signal is detected inside toner con- continuously for 5 seconds since the tainer. toner motor is activated. Defective toner Replace the developer unit (See page P.1-5- replenishment...
  • Page 53 2F7-5 Remarks Code Contents Causes Check procedures/corrective measures F040 Main PWB - engine PWB communica- Defective harness Reinsert the connector. Also check for conti- tion error between engine nuity within the connector harness. If none, Communication between main PWB and PWB (YC12) and remedy or replace the harness.

  • Page 54: Image Formation Problems

    1-4-3 Image formation problems (1)Completely blank (2)All-black printout. (3)Dropouts. (4)Black dots. (5)Black horizontal printout. streaks. P.1-4-9 P.1-4-10 P.1-4-11 P.1-4-11 P.1-4-12 (6)Black vertical (7)Unsharpness. (8)Gray background. (9)Dirt on the top (10)Undulated print- streaks. edge or back of the ing at the left edge paper.
  • Page 55 (1) Completely blank printout. Print example Causes Check procedures/corrective measures No trans- Poor contact of engine Check the installation position of the engine PWB. PWB’s transfer bias out- Refer to figure 1-4-3 below. charging. put terminal and printer’s contact (spring). Printer bottom Contact (spring)
  • Page 56 2F7-2 (2) All-black printout. Print example Causes Check procedures/corrective measures No main Defective main charger Replace the main charger unit (See page P.1-5-12). charging. unit. Poor contact of engine Check the installation of the drum (main charger) unit. PWB’s main charger out- Refer to figure 1-4-5 below.
  • Page 57 2F7-1 (3) Dropouts. Print example Causes Check procedures/corrective measures Defective developing roller (developer If the defects occur at regular intervals of 39 mm/1 " (See 9/16 unit). page P.2-4-2), the problem may be the damaged developing roller (in the developer unit). Replace developer unit. If a developer unit which is known to work normally is available for check, replace the current developer unit in the printer with the normal one.
  • Page 58 (5) Black horizontal streaks. Print example Causes Check procedures/corrective measures Defective drum unit's ground. Defective drum unit's ground. The contact (spring) in the drum unit and its counter part, the drum grounding terminal in the printer, must be in a good contact. (See page P.1-4-9, refer to figure 1-4-3) Defective drum unit.
  • Page 59 (8) Gray background. Print example Causes Check procedures/corrective measures Print density setting. The print density may be set too high. Try adjusting the print density. For details refer to the printer's operation guide. Defective drum surface potential. If a drum unit which is known to work normally is available for check, replace the current drum unit in the printer with the nor- mal one.

  • Page 60: Electric Problems

    1-4-4 Electric problems Problem Causes Check procedures/corrective measures Defective waste toner sen- Replace the drum unit (See page P.1-5-11). Defective waste sor. toner box detecting. Defective connection Check the connection of connectors between drum PWB (YC1) between drum PWB (YC1) and connect-L PWB (YC3).
  • Page 61 Problem Causes Check procedures/corrective measures Broken power cord. Replace the power cord. Defective message The power cord is not Check the contact between the printer’s AC inlet and the AC displaying (LCD) [2]. plugged in properly. power outlet. No message appears on the message dis- No electricity at the AC Measure the AC input voltage.

  • Page 62: Mechanical Problems

    1-4-5 Mechanical problems Problem Causes/check procedures Corrective measures Check if the surfaces of the following rollers Clean with isopropyl alcohol. No primary paper feed. are dirty with paper powder: pickup roller, paper feed roller, and MP tray feed roller. Check if the pickup roller, paper feed roller Check visually and replace any deformed and MP tray feed roller are deformed.
  • Page 63 2F7-4 1-5 Assembly and Disassembly 1-5-1 Precautions for assembly and disassembly (1) Precautions Be sure to turn the power switch off and disconnect the power plug before starting disassembly. When handling PWBs, do not touch connectors with bare hands or damage the PWB. Do not touch any PWB containing ICs with bare hands or any object prone to static charge.

  • Page 64: Outer Covers

    2F7-2 1-5-2 Outer covers (1) Detaching and refitting the top cover Procedure 1. Open the top cover. Top cover 2. Remove the two screws. 3. Remove the one connector and then remove the top cover. Screw Screw Connector Figure 1-5-1 1-5-2...
  • Page 65 2F7-4 (2) Detaching and refitting the right cover and left cover Procedure 1. Remove the paper cassette. 2. Open the MP tray. 3. Open the rear unit. 4. Remove the top cover (See page P.1-5-2). 5. Unlatch the three latches and then remove the right cover.
  • Page 66 1-5-3 Paper feed section (1) Detaching and refitting the paper feed assembly (paper feed roller and pickup roller) Procedure 1. Remove the paper cassette. 2. Slide the paper feed roller pin. 3. While pressing the lever and then remove the paper feed roller assembly. 4.
  • Page 67 (2) Detaching and refitting the retard roller Procedure 1. Remove the paper cassette. 2. Push the bottom plate down until it locks. Paper cassette 3. Unlatch the two latches and then remove the retard guide. Bottom plate Latch Retard guide Latch Figure 1-5-5 4.
  • Page 68 (3) Detaching and refitting the registration upper and lower roller Procedure 1. Remove the developer unit (See page P.1-5- Spring 10). 2. Remove the spring. 3. Pull the registration upper roller. Registration upper roller Figure 1-5-7 4. Remove the registration upper roller from the bush.
  • Page 69 6. Remove the stopper. 7. Slide the bush. Stopper Bush Registration lower roller Figure 1-5-9 8. Remove the registration lower roller. 9. Remove the gear and three bushes from the Registration lower roller registration lower roller. Gear Bush Bush Bush 10.
  • Page 70 2F7-4 (4) Detaching and refitting the MP tray paper feed roller Procedure 1. Remove the paper cassette. 2. Open the top cover. 3. Remove the two holders from the main unit frame. MP tray Main unit frame Main unit frame Holder Holder MP tray...
  • Page 71 2F7-4 4. Remove the two holders from the main unit frame. 5. Remove the MP tray. MP tray MP tray MP tray Holder Holder Main unit frame Main unit frame Figure 1-5-12 6. Pull the MP tray paper feed roller holder. 7.

  • Page 72: Developer Section

    1-5-4 Developer section (1) Detaching and refitting the developer unit Procedure 1. Open the top cover. Top cover 2. Open the MP tray. 3. Remove the developer unit. Developer unit 4. Check or replace the developer unit and refit all the removed parts. MP tray Figure 1-5-14 1-5-10...
  • Page 73 1-5-5 Drum section (1) Detaching and refitting the drum unit Procedure 1. Remove the developer unit (See page P.1-5- Left side cover 10). 2. Open the left side cover and then remove the waste toner box. 3. Unlock the drum unit lock and then remove the drum unit.
  • Page 74 2F7-3 (2) Detaching and refitting the main charger unit Procedure 1. Remove the drum unit (See page P.1-5-11). Main charger unit 2. Unlock the lock lever and then remove the main charger unit. 3. Check or replace the main charger unit and Lock lever refit all the removed parts.
  • Page 75 2F7-3 1-5-6 Transfer/separation section (1) Detaching and refitting the transfer roller and separation charger brush unit Procedure 1. Remove the developer unit (See page P.1-5- Paper chute guide 10). 2. Remove the drum unit (See page P.1-5-11). Hook 3. Slide the paper chute guide and unhook the Hook hooks.
  • Page 76 6. Release the six latches and then remove the separation charger brush unit. 7. Check or replace the transfer roller and sep- Separation charger aration charger brush unit and refit all the brush unit removed parts. CAUTION: Note the following, when refitting the separation charger brush unit.
  • Page 77 1-5-7 Fuser section (1) Detaching and refitting the fuser unit Procedure Flat-blade 1. Open the rear unit. screwdriver 2. Insert a flat-blade screwdriver to push the fuser lock (gray colored) on the rear unit and the fuser unit is separated from the rear unit Fuser unit (rails).
  • Page 78 (2) Detaching and refitting the fuser heater lamp M and S Procedure 1. Remove the fuser unit (See page P.1-5-15). Screw 2. Remove the two screws and then open the fuser unit. Screw Fuser unit Figure 1-5-21 3. Remove the two screws form the fuser Fuser heater lamp M heater lamp M and S.
  • Page 79 4. Remove the two screws form the fuser heater lamp M and S. Fuser heater lamp M 5. Remove the fuser heater lamp M and S. Screw 6. Check or replace the fuser heater lamp M Screw and S, and refit all the removed parts. Terminal Seat the fuser heater lamp M and S aligning Fuser heater...
  • Page 80 (3) Detaching and refitting the heat roller Procedure 1. Remove the fuser heater lamp M and S (See page P.1-5-16). Heat L bush 2. Remove the heat roller from the fuser upper frame. 3. Remove the heat R bush, heat L bush, heat Heat roller gear Z46 and heat roller ground plate from Heat R bush...
  • Page 81 (4) Detaching and refitting the press roller Procedure 1. Remove the fuser unit (See page P.1-5-15). 2. Open the fuser unit (See page P.1-5-16). 3. Remove the press roller from the fuser lower Bearing frame. 4. Remove the two bearings. Press roller 5.
  • Page 82 (5) Detaching and refitting the fuser thermistor M, fuser thermistor S and thermal cutout Procedure 1. Remove the fuser unit (See page P.1-5-15). 2. Turn the fuser unit bottom side up. Cord cover 3. Unlatch the two latches and then remove the cord cover.
  • Page 83 8. Remove the one screw (nut) and then remove the fuser thermistor M. Screw Fuser thermistor M Figure 1-5-28 9. Remove the two screws (nuts) and then remove the terminal and cord plate. Screw 10. Remove the thermal cutout Screw 11.
  • Page 84 1-5-8 PWBs (1) Detaching and refitting the engine PWB Bottom plate 1 Procedure Screw 1. Remove the fuser unit (See page P.1-5-10). 2. Remove the top cover (See page P.1-5-2). 3. Remove the left cover (See page P.1-5-3). 4. Remove the PSU fan motor (See page P.1- 5-28).
  • Page 85 10. Detach the joint. 11. Remove the eight screws and then remove Joint the DU base. DU base Screw Screw Screw Screw Screw Screw Screw Screw Figure 1-5-32 12. Remove the four snaps. 13. Remove the one tab. 14. Remove the one screw and then remove the grounding terminal.
  • Page 86 15. Remove the seven connectors (A). Engine PWB assembly 16. Remove the left wire guide. 17. Remove the three screws and then remove the engine PWB assembly. 18. Remove the two connectors (B) from the engine PWB. Screw Screw Connector (A) Connector (A) Connector (A) Connector (A)
  • Page 87 2F7-2 19. Remove the one connector. 20. Remove the two screws (A) and then remove the HV plate. 21. Remove the two screws (B) and then remove the engine R ground plate, engine L HV plate Screw (B) ground plate and shield plate. Screw (A) 22.
  • Page 88 2F7-2 (2) Detaching and refitting the main PWB Procedure 1. Remove the top cover (See page P.1-5-2). Connectors (six) 2. Remove the right and left cover (See page P.1-5-3). 3. Remove the six connectors from the main PWB. 4. Remove the one screw and then remove the Main PWB connect-R PWB.
  • Page 89 7. Remove the screw and then open the inner Inner cover cover. 8. Remove the connector. Screw Connector Figure 1-5-38 9. Remove the five screws and then remove the main PWB from the controller box. Screw 10. Check or replace the main PWB and refit all the removed parts.
  • Page 90 2F7-2 (3) Detaching and refitting the power source unit Procedure 1. Remove the top cover (See page P.1-5-2). 2. Remove the right and left cover (See page P.1-5-3). 3. Remove the one connector (YC11) form the connect-L PWB. 4. Remove the two hooks and then remove the Connector (YC11) PSU fan motor.
  • Page 91 2F7-2 5. Remove the eight screws and three ground- ing terminals. Screw Grounding Screw terminal Screw Grounding terminal Screw Screw Screw Grounding Screw terminal Screw Figure 1-5-41 6. Remove the AC inlet. PWB connector 7. Remove the one connector. 8. Remove the PWB connector between con- nect-L PWB and then remove the power source unit.
  • Page 92 1-5-9 Others (1) Detaching and refitting the paper feed drive unit Procedure 1. Remove the paper cassette. Right fan motor Clamp 2. Remove the developer unit (See page P.1-5- Hook 10). 3. Remove the top cover (See page P.1-5-2). Connectors 4.
  • Page 93 (2) Detaching and refitting the main drive unit Procedure 1. Remove the top cover (See page P.1-5-2). 2. Remove the right cover (See page P.1-5-3). 3. Remove the controller box (See page P.1-5- 26). 4. Remove five screws and then remove the main drive unit.
  • Page 94 (3) Detaching and refitting the laser scanner unit Procedure 1. Remove the top cover (See page P.1-5-2). Screw 2. Remove the right cover (See page P.1-5-3). Laser scanner unit 3. Remove the three connectors from the main Screw PWB. 4. Remove the four screws and then remove the laser scanner unit.

  • Page 95: Downloading Firmware

    1-6 Firmware 1-6-1 Downloading firmware The system firmware can be update by downloading new firmware. Downloading can be made either by directly sending the new firmware from PC via the parallel interface or using a memory card that contains the new firmware. Firmware file name example Software ID Compression...
  • Page 96 (1) Downloading the firmware from the parallel interface To download the system firmware using the parallel interface, use the procedure below. Note that you can’t download both the system and engine firmware at a time. 1. Turn printer and PC power off. 2.
  • Page 97 2F7-4 (2) Downloading the firmware from the memory card The procedure below provides how to download firmware from a memory card. Note that you can download both the system and engine firmware at a time. 1. Turn printer power off. 2.
  • Page 98 11. Confirm that the printer's power switch is set to off. 12. Insert the memory card into the printer's memory card slot. Memory card slot Memory card Figure 1-6-7 13. Turn printer power on. Power switch: On 14. When message display (1) is displayed to detect firmware in the memory card.
  • Page 99 2F7-2 (3) Downloading the firmware from the USB memory The procedure below provides how to download firmware from a memory card. Note that you can’t download both the system and engine firmware at a time. 1. Turn printer power off. 2.
  • Page 100 This page is intentionally left blank. 1-6-6...

  • Page 101: Paper Feed Section

    2-1 Mechanical Construction 2-1-1 Paper feed section Paper feed section consists of the paper feed unit that feeds paper from the paper cassette and the MP tray paper feed unit that feeds paper from the MP tray, and the paper feed conveying section that conveys the fed paper to the transfer/ separation section.
  • Page 102 (2) MP tray paper feed section The MP tray can contain about 100 pages. Feeding is performed by the rotation of the MP tray feed roller from the MP tray. Function of the MP tray friction pad prevents papers from multiple feeding. Figure 2-1-3 MP tray paper feed section MP tray paper feed roller Bottom plate...
  • Page 103 (3) Paper feed conveying section The conveying section consists of the parts shown in the following illustration and conveys papers from the paper cassette or the MP tray to the transfer/separation section when papers are fed. Paper by feeding or refeeding is conveyed by the middle feed roller to the position where the registration sensor is turned on, and then sent to the transfer/separation sec- tion by the upper registration roller and lower registration roller.
  • Page 104 2-1-2 Drum section (1) Drum section The drum unit includes a photoconductive drum, eraser lamp, cleaning blade and, a main charger unit. The drum unit is removable with the main charger unit. Figure 2-1-7 Drum section Drum Main charger case Charger roller cleaning roller Main charger roller Main high voltage output (DC + AC)

  • Page 105: Expose Section

    2-1-3 Expose section (1) Laser scanner unit The charged surface of the drum is then scanned by the laser beam from the laser scanner unit. The laser beam is dis- persed as the polygon motor revolves to reflect the laser beam over the drum. Various lenses and mirror are housed in the laser scanner unit, adjust the diameter of the laser beam, and focalize it at the drum surface.
  • Page 106 Laser scanner unit POLCLK Polygon YC10-1 POLRDYN motor YC12-1 POLONN YC12-2 PDMASKN YC12-4 Laser Pin-photo beam sensor YC12-2 Engine PWB PD PWB Main PWB Laser Drum diode APC PWB OUTPEN YC12-3 SAMPLEN1 YC14-2 VDATAP1 YC14-4 VDATAN1 YC14-5 BEAMSEN1A YC14-7 BEAMSEN1B YC14-8 Figure 2-1-10Laser scanner unit block diagram 2-1-6...

  • Page 107: Developing Section

    2F7-1 2-1-4 Developing section (1) Developer unit The developing section consists of the developer unit and the toner container. The developer unit consists of the develop- ing roller where a magnetic brush is formed, the doctor blade and the agitator A and B that agitate the toner. Also, the toner sensor checks whether or not toner remains in the developer unit.
  • Page 108 2-1-5 Transfer/separation section (1) Transfer/separation section The image developed by toner on the drum is transferred onto the paper because of the electrical attraction between the toner itself and the transfer roller. The transfer roller is negatively biased so that the positively charged toner is attracted onto the paper while it is pinched by the drum and the transfer roller.

  • Page 109: Cleaning Section

    2-1-6 Cleaning section After the transferring process, the drum needs to be physically cleaned of toner which is residual after the development process. The cleaning blade is constantly pressed against the drum and scrapes the residual toner off to the cleaning roller.
  • Page 110 2-1-7 Fuser section (1) Fuser unit The fuse section consists of the following parts and fixes the toner that is transferred to the paper at the transfer/separa- tion section. The paper sent from the transfer/separation section is interleaved between the heat roller and the press roller. The heat roller is heated by the fuser heater lamp installed inside, and the toner is fused by heat and pressure and fixed onto the paper because the press roller is pressed by the fuser press spring.
  • Page 111 Fuser unit Power source LIVE Thermal cutout YC102-3 COMMON1 YC102-1 COMMON2 Fuser YC102-5 thermistor S Fuser thermistor THERM2 Fuser Fuser YC6-11 heater heater THERM1 YC6-9 lamp S lamp M Heat EXITPAP roller YC6-2 Paper exit sensor Engine PWB Figure 2-1-18Fuser section block diagram 2-1-11...
  • Page 112 2-1-8 Paper exit section/rear unit (1) Paper exit section/rear unit The paper exit section transports the paper which passed the fuser unit towards the top tray. The paper which passed through the fuser unit turns on the paper exit sensor which is driven by the fuser actuator in the fuser unit, and is led by the guide comprised of the rear cover and the frame, finally reaching the face down upper roller.
  • Page 113 2F7-1 Face down tray paper Connect-L full sensor FDPFULN YC4-1 AUTA1 YC9-2 AUTB3 YC9-3 AUTB1 YC9-4 AUTB3 YC9-5 Connect-R Switch back motor Engine Paper exit section Face up/down solenoid FDDRN YC6-12 FUDRN YC6-14 Duplex YC6-4 sensor Rear unit Fuser unit Figure 2-1-20Paper exit section/rear unit block diagram 2-1-13...

  • Page 114: Duplex Conveying Section

    2-1-9 Duplex conveying section (1) Duplex conveying section Figure 2-1-21Duplex conveying section DU roller Duplex jam sensor DU feed pulley (actuator) DU base DU roller DU lower guide DU feed pulley DU roller (10) Feed upper guide DU feed pulley Connect-R Engine PWB Duplex jam...

  • Page 115: Electrical Parts Layout

    2F7-2 2-2 Electrical Parts Layout 2-2-1 Electrical parts layout (1) Electrical parts layout Drum unit Fuser unit Developer unit Figure 2-2-1 Electrical parts layout Main PWB ............ Controls the software such as the print data processing and provides theinterface with computers. Engine PWB..........
  • Page 116 2F7-2 Connect-R PWB........... Interconnects the engine PWB and the electrical parts. Connect-L PWB ........... Interconnects the engine PWB and the electrical parts. Drum PWB ........... Relays wirings from electrical components on the drum unit. Drum indi- vidual information in EEPROM storage. Developer PWB ...........

  • Page 117: Power Source Unit

    2-3 Operation of the PWBs 2-3-1 Power source unit Power source unit MP tray paper feed sensor HANDSN ZCROSS Zero cross signal circuit SWSLEEPN Power switch Switching AC input regulator +5V1 circuit +24V1 Interlock Interlock Fuser switch 2 switch 1 heater +24V2 lamp M...
  • Page 118 YC102 Figure 2-3-2Power source unit silk-screen diagram Connector Pin No. Signal Voltage Description YC101 LIVE 120 V AC AC power input Connected 220 - 240 V AC to the AC NEUTRAL 120 V AC AC power input inlet 220 - 240 V AC YC102 COMMON1 120 V AC...

  • Page 119: Engine Pwb

    2F7-2 2-3-2 Engine PWB Right fan Fuser unit MP tray paper Duplex Developer Registration Middle feed Paper feed motor switch feed solenoid clutch solenoid clutch clutch clutch Connect-R PWB Operation Polygon panel PWB APC PWB PD PWB motor Switchback motor Main motor Drum motor Main PWB...
  • Page 120 YC11 Figure 2-3-4Engine PWB silk-screen diagram 2-3-4...
  • Page 121 Connector Signal Voltage Description SWFAN 0/5 V DC PSU fan motor: On/Off Connected SWSLEEPN 0/5 V DC Sleep mode: On/Off to the con- ZCROSS 0/5 V DC (pulse) Zero cross signal nect-L PWB HEATONN1 0/24 V DC Fuser heater lamp M: On/Off (YC8) HEATONN2 0/24 V DC...
  • Page 122 Connector Signal Voltage Description 5 V DC 5 V DC power source Connected LIFTSEN Not used to the lift +5V2 5 V DC 5 V DC power source sensor LMOTON Not used Connected DUDRN 0/24 V DC Duplex clutch: On/Off to the con- DLPDRN 0/24 V DC...
  • Page 123 Connector Signal Voltage Description YC15 +5V1 5 V DC 5 V DC power source Connected FANDRN 0/2.5/5 V DC Feed fan motor: Full speed/Half speed/Off to the feed fan motor 2-3-7...

  • Page 124: Main Pwb

    2-3-3 Main PWB CPUA [31: 0] ASIC PPC750CXr CPUDH [31:0] MA [12:0] MDQ [31:0] [15:0] [23: 2] MCSN [4:0] , MCKE[4:0], EXTBOEN Level shift Latch MRASN, MCASN, MWEN, MBA [1:0] , MDQS [3:0], RSTN DM [3:0], MCKP [6, 4:3, 1:0], Engine SDRAM SCLKN, SO, SI,...
  • Page 125 2F7-2 2-4 Appendixes (1) Wiring diagram 2-4-1...
  • Page 126 2F7-1 (2) Repetitive defects gauge First occurrence of defect 36 mm ( 1 " [Upper registration roller] 7/16 38.5 mm ( 1 " [Main charger roller] 39 mm ( 1 " [Developing roller] 9/16 52 mm ( 2 " [Lower registration roller] 1/16 55 mm ( 2 "...

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