Canon LBP-860 Service Manual
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Canon LBP-860 Service Manual

Canon LBP-860 Service Manual

Laser beam printer
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LBP-860
SERVICE
MANUAL
Canon

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  • Page 1 LBP-860 SERVICE MANUAL Canon...
  • Page 2 PREFACE This Service contains basic information required for after-sales service of the LBP-860 Manual laser beam printer lhereinafter referred to as the “printer”). This information is vital to the service trchnirian in maintaining the high print quality and performance of the printer.

  • Page 3: Table Of Contents

    CONTENTS CHAPTER 1 GENERAL DESCRIPTION PARTS OF THE PRINTER ..l-8 FEATURES ......l - l OPERATION .
  • Page 4 B. Video Controller PCB..3-19 A. Laser/Scanner Unit ... 3-11 ELECTROSTATIC IMAGING/ C. DC Controller ..... 3-20 D. Pick-up Motor Driver PCB.. 3-21 DEVELOPING/CLEANING E. Sensor PCB......3-21 SYSTEM .
  • Page 5 VII. LOCATION OF ELECTRICAL VIILVARIABLE RESISTORS, LEDS, PARTS/FUNCTION....6-46 TEST PINS, JUMPERS, AND A. Switches ......6-46 SWITCHES ON PC BOARDS..

  • Page 6: Iii. A Safety Information

    CHAPTER 1 GENERAL DESCRIPTION PARTS OF THE PRINTER..1-S FEATURE3 ......l - l OPERATION..
  • Page 7 This non-impart (low-noise) printer USPS clectrophotographic, electronic, and laser technology 2. High print quality through use of fine toner and high resolution I600 dpil Toner having a particle size half that of conventional Canon loner and higher resolution (600 dpi) produce clearer images.
  • Page 8 CHAPTER 1 A. Construction l‘vw ~ Desktop pa@ printer ‘I-intinil. method Elcctropholoqaphy ,awr scanning syste”, <ascr Srmicondurtor laser icar,ninc system Rotaling six-faced prism mirror (Scanning mirror) jczmning piclr l<~i?Z”~t~l 600 dots/inch JwUral 600 rastc-r lines/inch ‘hotosrns~llvr mrdium OPC L’hargint( Roller rharging Exposurr Laser scanning roner...
  • Page 9 Plain paper, colurcd paprr. lahels. OHP film, rnvelopes l’lain pap”’ from 182 mm X 257 mm to 2 I6 mm X 356 mm (Canon- approvrd paprr, 60 g/m’ to 128 g/m”), and above type of paper I’laitr paper of A4. B5, Legal. Letler, or Executive (Canon-approved paper 60 g/ml to 90 g/m’)

  • Page 10: Specifications

    D. Video controller Standard: Enhanced PCL (PCL 5e) Emulahon: Optional PoslScript’M 2MB (Expandable to 66 Megabytes in total with optional RAM SIMM) 2MU (Expandable lo 8 Megabytes in total with optional ROM SIMM) See table 1-I and 1-2. See figure l-l. SlOlS KS-232C.
  • Page 11 CHAPTER 1 Table l-l *Scalable Fonts Pitch Point Stroke Font Symbol 1rIr‘ntation Typefact- Spacing Style ICPil Size Weight ‘L Medium Lipright Portrait C0llIier ioman- Fixed 1000 Scalable Portrait Bold Upright IO03 Courier ioman- Proportional Medium Italic Portrait Courier ioman- 1004 Portrait Courier ioman-...
  • Page 12 CHAPTER 1 Table l-2 *Fixed Fonts Symbol Stroke P i t c h P o i n t S p a r i n g Orientation Style Weight (CPJJ sixe U p r i g h t L a n d s c a p e Medium 1 6 .
  • Page 13 A. Handling the Laser/Scanner Unit The laser/scanner unit emits invisible lasrr beam. Never disassemble the unit; lhc reflected bram. although invisible. ran possibly damage your eyes. The unit rannot be adjusted in the field. The following label is altached to the cover of lhe unit: Figure 1-2...
  • Page 14 CHAPTER A. External View 1. Printer I: Upper cover 2: Face-down tray 3: Right rover 4: Control panel 5: Font card slot 6: Power switch 7: Cassette 8: Multi-purpose tray 9: Test print switch 10: Delivery cover 11: Power receptacle 12: Parallel interface connector 13: Serial interface connector Figure l-3...
  • Page 15 2. Paper feeder 1: Paper feeder 2: Cassette (500 sheets can be placed) Figure 1-6 3. Envelope feeder 1: Envelope side guide 2: Exlension tray 3: Weight Figure l-7...
  • Page 16 CHAPTER 1 B. Cross Sectional View 1. Printer Figure 1: Delivery rollers 9: Oblique rollers 2: Lasw/scanner unit 10: Cassette pick-up roller 3: EP-E cartridge 11: Developing cylinder 4: Control panel 12: Transfer charging roller 5: Multi-purpose tray 13: Photosensitive drum 6: Cassette 14: Primary charging roller 7: Mulli-purpose tray pick-up roller...
  • Page 17 CHAPTER 1 3. Envelope feeder Figure 1-9 l-11...
  • Page 18 CHAPTER 1 A. The Operator Panel You use the operalor panel to perform basic printer operations, make printer configuration changes your software application cannot control, identify available typefaces, and check the status of the printer. READY ALARM DATA ON LINE FORM FEED RESET MENU...
  • Page 19 CHAPTER 2. Indicator Lights The indicator lights provide status information about the printer. The lights have different meanings depending on whether they are on, off, or flashing. Figure l-11 Indicator light Mode Description READY The printer is ready to print. An error or attendance message appears in the display.
  • Page 20 CHAPTER 1 The paper input source indicators are: ~~~~ ENVELOPE FEEDER STANDARD CASSETTE LOWER CASSETTE (PAPER FEEDER UNIT) -~~ MUCKPURPOSE T R A Y Figure 1-12 Mode Description indicator light The optional Envelope Feeder is the input source. Envelope Flashing The optional Envelope Feeder is selected, but does not Feeder contain envelopes.
  • Page 21 CIIAPTER 1 3. Operation Keys You USC the operation keys to control the basic functions of the printer. .ON LINE key You use the ON LINE key to switch the printer between on-line and off-line. The printer must be on-line to receive information from your computer. To use any of the other keys on the operator panel, the printer must be off-line.
  • Page 22 CHAPTER 1 .TEST/FONT key You use the TEST/FONT key to print the Self Test or the Font List. When lhe printer is off-line, press the TEST/FONT key once to start the Self Test. Press and hold the TEST/FONT key to print the Font List. The Self Test and Font List are described later in this chapter.
  • Page 23 CHAPTER 1 mad? in the menu are marked with an asterisk but do not become active until the printer detects a job boundary or you reset the prinler. Press CONTINUE to set the printer off-line withoul performing a reset. *** Need to verify all of this *** 1-17...
  • Page 24 CHAFTER 1 B. Operator Panel Menus You (‘LIT, access the following menus though the operator panel: n PCL PRINT MENU PCL CONFlG MENU LIepending on the options installed in your prinler, other menus may display. 1. Accessing and Selecting Menu Items Follow these steps to access the menus and make selections: 1.
  • Page 25 CHAPTER1 3. Restoring the Default Settings There are several types of default settings: Factory default settings are those set for each menu item at the factory. The printer uses these settings until you change them. Temporary drfaull settings are those set by your application software for the current print job.
  • Page 26 FNT SRC and FNT NUMBER is a scalable font with proportional spacing. Point size is a measure of the vertical height of a character in l/72 of an inch. The LBP-860 adjusts the character’s horizontal spacing according to the point size you select. l-20...
  • Page 27 Landscape prints along lhe length of the page You can print in reverse portrait or reverse landscape orientations by making selections through your software application or using printer commands. The LBP-860 has a font rotation feature which makes all fonts available in all orientations. 1 - 21...
  • Page 28 CHAPTER 1 I’RIN’I MENU Fart “l-y option default Description Selects the number of lines to print on each page (5 through 128) as FORM LINES well as the amount of space between lines. The FORM menu item places the first line of lext at the top margin, the last line of text at the bottom margin.
  • Page 29 Options D. PCL CONFIG MENU The PCL CONFIG MENU controls certain conflguration settings for your LBP-860. You cannot override or change options in this menu through your software applicalion. The I/O oplion allows you to set up the communication parameters for the serial interface (if you arc using it).
  • Page 30 NOTE: When you set lhe density to a higher level. LANG ENGLISH The LBP-860 supports the English language. dhnmunications Menu Thhc I/O option allows you lo set up the communication parameters for the serial interface (if you arc {Ising it).
  • Page 31 CILAPTER 1 Allows you to choose active high (HI) or active low (LOW) for the POLARITY DTR signal Itne. DATA BITS 8 Determines the data bits used in transmission. Some minicomputer environments only support 7 bit printer data. Setting DATA BITS=7 allows the printer function correctly in environments where the eighth bit is not supported.
  • Page 32 RAM Size: Shows the total amount of installed printer memory, including added optional memory. The LBP-860 comes with 2MB of installed memory. If you install optional memory, you can use a self test to verify it is properly installed.
  • Page 33 CHAPTER F. Printing the PCL Font List Follow these steps to print Ihe Font Lisl: I. Press the ON LINE key to set the printer off-line. 2. Press and hold the TEST/FONT key (for approximately five seconds). The printer displays the FONT I’IIINTOUT message.
  • Page 34 CIIAPTER l-28...
  • Page 35 CHAPTER 1 l - 2 9...
  • Page 36 CHAPTER 1 Jkal Font List *** *** Nred Typeface is the name of the typeface. Pitch/Point indicates the specified pitch or point size of the font. The escape sequence contains a shaded box followed by v or h. This indicates where you must enter the point size (for example.

  • Page 37: Chapter 2 Operation And Timing

    I l l . CHAPTER 2 OPERATION AND TIMING 1. This chapter describes ihe printer functions. the relationships between mechanisms and circuits, and the timing of operations. Mechanical linkages are indicated by black and ( 11[1c 1. the ilow of control signals by solid arrows ( ___) 1, and the flow of white lines...

  • Page 38: Functions

    Functions Printer functions can be divided into five groups: the system interface, the overall control system. the image-formation system, the laser/scanner unit, and the paper pick-up/feed system. To external device (computer, etc.) - - - - _ _ _ _ _ _ _ _ _ _ _ _ _ _ - _ - - _ r - - - - - SYSTEM INTERFACE -----------______---------_-,...

  • Page 39: 2-L B. Outline Of The Electrical V. System

    CHAPTER 2 B. Outline of the Electrical System The operations of this printer are controlled by the microprocessor located on the DC controller I’CU. When the power is turned on and the printer goes into standby, the microprocessor outputs signals to drive the laser diode, motors. and solenoids in response to print commands and image data from the exlernal device.

  • Page 40: Dc Controller Input Signals

    CHAPTER 2 C. DC Controller Input Signals DC controller PCB ‘SNS “H” when the delivery paper sensor detects paper or when the delivery caver IS open Therm&or Pick-up motor dwer PC6 __------ *I) “L” when paper IS detected. cassette paper ‘2) “Y when detected ?&“SO,...

  • Page 41: Dc Controller Input/Output Signals

    CHAPTER 2 D. DC Controller Input/Output Signals (l/2) DC controller Laser/scanner unit 5206.1 ,’ “L” to switch the laser ON forcibly. /LON _’ “L” to watch the laser ON according to the NDATA signal. /ENBL The laser switches ON when the /ENBL N DATA ,”...
  • Page 42 CHAPTER 2 DC Controller Input/Output Signals (2/2) COntrOller Power supply .._-__-_______~ “L’ to swtch the fixing roller heater ON. IFSRD “L’ to deenerg,ze the relay OFF and cut power to the fixing roller heater. _---___l Output the thermistor voltage value THOUT connector PCB I :...

  • Page 43: Basic Sequence Of Operations

    CHAPTER 2 E. Basic Sequence of Operations A4 paper ‘IXvo consrcutivc prints on (Cassette feed) Figure 2-6 Table 2-l Purpose I’uind Remark To warm up Front powr’r--ON unlil tlw fixing the fLving roller to During this period, thr [WAIT roller trmpt~r~tr~re I-pachrs 172°C put the printu in the standby printer checks the car- pl-r”“l)

  • Page 44: Outline

    CHAPTERS The DC controller controls the APCOU’I signal to set the APCIN signal to the specified value to stabilize the intensity of the laser beam. (Control of laser beam A. Outline intensity: APC control) The modulated laser beam is formed by External device a collimator lens and a cylindrical lens into a parallel beam that strikes the scanning...

  • Page 45: Scanning Exposure

    CHAPTER 2 B. Scanning Exposure across the drum and return to its original The simplest example of exposure of the position, the drum surface ratates about 43 photosensitive drum by the Laser beam is )_trn (600 raster lines/inch). Successive to imagine that both the drum and beam horizontal scans are therefore separated by are stationary.
  • Page 46 CHAPTER 2 signal is called lhe UNBLANKING signal (UBL) a n d i s p r o d u c e d b y t h e D C controller. The UBL signal is sent to the laser driver as the FORCIBLE LASER ON signal (/LON) to cause it lo switch the laser diode ON when the /LON signal is ‘T’.

  • Page 47: Laser Control Circuit

    CHAPTER 2 Control Circuit C. Laser 1. Outline Laser driver PC6 DC controller _____-._.-.-_- ~‘-__‘-_-‘-.-. r--‘-- J207-17 ’ ND0 J207-2&/BD i._._._._._._._._._.. Figure 2- 12 The CPU adjusts the value of the This circuil switches the laser diode (LD) APCOUT signal by changing the APCOR ON and OFF at a constant intensity in response lo the /VDO signal from the video signal for coarse adjustment, and the...
  • Page 48 CHAPTER 2 output externally) to “H” and sets the 2. Control of laser beam intensity (APC FORCIBLE LASER ON signal (/LON) to control] “L”. The CPU performs aulomalic power control (AI’C) of the laser diode to make the laser The CPU then changes the APCOS diode light.
  • Page 49 CHAPTER 2 3. laser diode emission control ‘Em Laser diode emission is controlled by VIDEO u& signal (/VDOJ, which is sent from the video M S K -Tlr controller and processes the paper size data. The paper size data is input to the CPU from the cassette size sensing switches for cassette feed and by the paper size command from the video controller for...

  • Page 50: Scanner Drive

    CHAPTER 2 speed. D. Scanner Drive The scanner driver drives the scanner 1. Outline motor when it is receiving the SCANNER MOTOR DRIVE signal (/SCNON) from the DC controller. 2. Scanner motor rotation control Figure 2-15 shows the scanner motor control circuit.
  • Page 51 CHAPTER 2 the scanner motor. to turn signal “L” When the scanner motor turns and reaches the prescribed speed, the CPU sets the SCANNEK MOTOR READY signal (/SCNRDY) to “L”. The CPU notifies a scanner error to the video controller in the following cases: a.
  • Page 52 CHAFf-ER 2 The primary charging roller uniformly applies a negative charge to the surface of the photosensitive drum. To form the latent image on the photosensitive drum, the A. Outline laser beam modulated by the /VDO signal The image formation system is the main illuminates the photosensitive drum part of the printer, and it consists of the surface.
  • Page 53 tZ.HAPTER 2 the primary charging roller prior to generation of a new latent image. The cartridge has a toner sensor that detects whether there is enough toner or whether a cartridge is installed. If the level of toner in the cartridge becomes lower than the prescribed level.

  • Page 54: Printing Process

    CHAPTER 2 B. Printing Process The major part of the image formation system is contained in the cartridge. as shown in Figure 2-17. /‘, C Cartridge Laser beam /” Primary charging roll Transfer charging roller Static charge eliminator Figure 2- 17 Electrostatic latent image formation The cartridge used by the printer has a stage...
  • Page 55 CHAPTER 2 The primary charging roller consists of 1. Electrostatic latent image formation stage conductive rubber. In addition to DC bias, This stage has two steps, which together AC bias is applied to the primary charging produce a pattern oi elerlrical charges on roller to keep the potential on the drum the photosensitive drum.
  • Page 56 the laser beam have a higher potential 2. Development stage Development places particles of toner onto (are less negative1 than the negatively the areas of the drum that have been charged toner particles on the developing cleared of cylinder. When these areas approach the charge by the laser beam.
  • Page 57 CHAPTER 2 sets the charge on the drum to zero. In 3. Transfer stage In the transfer stage. the toner image is this case, the transfer voltage is made transferred from the drum surface to the negative to remove the negatively- paper.
  • Page 58 CHAPTER 2 5. Drum cleaning stage stage 4. Fixing In the transfer stage, not all the toner is The toner image transferred to the paper in transferred to the paper. Some remains on t h e t r a n s f e r s t a g e i s h e l d o n l y b y the photosensitive drum.
  • Page 59 CHAPTER 2 Reference: Toner projection development Arlually. both unexposed and exposed areas of the drum surface have a negative potential, but lo simplify the explanation, the drum potential is shown as positive when it is higher [less ncgalivr) than the developing cylinder potential, and negative when it is lower (more negative) than the developing cylinder potential.

  • Page 60: High-Voltage Power Supply

    CHAPTER 2 C. High-Voltage Power Supply 1. Outline In response lo an instruction from the microprocessor (MPU) on the DC controller PCF3, the high-voltage power supply applies a voltage comprising the DC voltage and the AC voltage to roller and developing cylinder and applies the positive or negalive DC primaly charging voltage lo the transfer charging roller.
  • Page 61 CHAPTER 2 b. Developing bias generation paper. When the DEVELOPING BIAS DC ON After completion of printing, a between- signal is sent from the DC controller via page and a negative biases are applied again to clean the transfer charging the serial line, a developing DC bias is roller.
  • Page 62 CIFAPTER 2 Note: The transfer high voltage is switched according to the printing sequence, as shown below. (A negaliw voltage is applied the transfer charging roller to clean it.) (A positive voltage is applied to the transfer charging roller to transfer toner from the surface of the drum to the paper.) l I[ : Between-page IA w e a k p o s i t i v e c h a r g e i s a p p l i e d t o t h e t r a n s f e r c h a r g i n g r o l l e r t o p r e v e n t...
  • Page 63 CHAPTER 2 This page intentionally left blank 2 - 26...
  • Page 64 CHAPTER 2 [SL70 1, SL702) energizes when the pick-up motor is running, the pick-up roller (urns and feeds a sheet of paper into the printer. Outline The paper stops at the resist paper sensor T h e p r e s e n c e o f p a p e r o n t h e m u l t i - (PS602).

  • Page 65: Paper Size Detection

    CHAFTER 2 The pick-up and delivery units have B. Paper Size Detection photointerrupters IPS602. PS20 1) to detect Loading the cassette in the printer feeder paper. If the print does not reach or clear actuates specific switches. From the each sensor within a preset time, the combination of actuated switches (Table 2.

  • Page 66: Cassette Feed

    CHAPTER 2 - Paper path hrom multi-purpose tray C. Cassette Feed Each pick-up roller and the oblique rollers of the pick-up unit are driven by the pick- up motor IM2). When the video controller sends the /PRNT signal to the printer, the pick-up motor starts rotating.

  • Page 67: Fixing And Delivery Unit

    CHAPTER 2 D. Fixing and Delivery Unit SURFACE TEMPERATURE signal (FSRTH) 1. Outline decreases. The upper/lower rollers of the fixing unit According to the voltage of the FSRTH and the delivery rollers are driven by the signal, the microprocessor (CPU) on the DC main motor (Ml).
  • Page 68 2. Fixing unit error detection Table 2-4 The CPU assumes a fixing unit error In the following cases, and informs the video E r r o r m e m o r y c a p a c i t o r (C202) charging detection If the voltage at pin 74 (AN161 of the CPU is 1.62 V or more (C202 is charged)
  • Page 69 3. Fixing roller heater start sequence When the power is switched ON, the CPU The sequence of operations from power-on reads the voltage of pin 74 (ANI6J. If the to standby is as follows: voltage is higher than the specified value, the CPU assumes a fixing unit error before power-ON and cuts the current to the The CPU turns the fixing roller heater...

  • Page 70: Paper Jam Detection

    CHAPTER 2 E Paper Jam Detection To detect the presence of paper and whether or not the paper has been fed correctly, the following paper sensors are provided: . Resist paper sensor IPS602) . Delivery paper sensor (PS201) The microprocessor (CPU) determines if a paper jam has occurred by checking whether paper is present at the sensor within the amount of time specified in the memory.
  • Page 71 CHAPTER 2 3. Delivery unit delay jam The microprocessor detects a delivery unit delay jam if the paper does no1 reach the delivery paper sensor (PS201) within the required time after the VERTICAL SYNC signal [/VSYNC) is rweived. /PRNT (Untt~ Seconds) STBY INTR PRINT...
  • Page 72 CHAPTER 2 standby state. B. Operation When the power is switched ON. the printer enters the WAIT state. When the prinler is ready for operation, the READY s i g n a l (/KDYl is sent from the DC controller to notify the video controller that the printer is ready.
  • Page 74 CHAPTER 2 b. Banding Coprocessor interface. The banding coprocessor is an Intel 8296 1 KU printer coprocessor that Parallel Port Interface integrates a graphics accelerator and A 256 byte FIFO is used to buffer compression processor necessary for printer data from the Host parallel port. JllO serves as the connector for the complex page description language (PDI,) c o n t r o l l e r s .
  • Page 75 ClMPTER 2 Figure 2-45 m. PCMCIA Interfxe 3. Connectors The following is a summary of the use for The PCMCIA Inlerfare (connector J 120) is supported by dedicated logic. This each connector: Generic Array Logic device (GALS) generates the control signals and Connector Use effects data transfers over the The Engine Interface...

  • Page 76: Outline

    CHAPTER 2 b. Displays the printer operating states D. Control Panel with LEDs. Outline Selects the printing environment, This control panel contains 10 LEDs, one VFD (vacuum tluorescent display), operating mode, utility, and paper 7 switches, and one beeper on the source with switches.

  • Page 77: Self-Test

    CHAPTER E. Self-test t h e R E A D Y i n d i c a t o r , ONLINE When the power is switched on, the printer indicator, and the paper pick-up mode executes the self-diagnosis program for the indicator light, and “00 READY AUTO”...

  • Page 78: Status/Error Message

    CHAPTER 2 F. Status/Error Message The following pages show the explanations and corrective actions of status and error messages which are shown in the Status indication display while the printer is operating. Figure 2-47 shows how messages appear on the Slatus indication display. Figure 2-47 If a warning message, operator call, or error occurs.
  • Page 79 l.Statu.9 messages operating normally. A status message shows printer operating state when the printer is Status indiration display Description Measure hhsagr ilrld In,b?r rirlrl HEADY Ready stale Note:You can specify a READY message in each operating mode. Thm is the default message.
  • Page 80 CHAPTER 2 2. Warning messages When a warning message is displayed, the operator should take the appropriate action, but does not need to stop the printer operation. Slatus indication display Description Measure NUrnbtY lkki Message kid Get a new toner carhidge. TONER LOW The toner level is low.
  • Page 81 CHAPTER 2 dication display Description Mea?.LX-e MPssa~e l,elli TONER LQW The toner level is low. Take the cartridge out. shake it as instructed in Section II1 of Chapter 4. reinstall it. and print. If this message is dlsplayed again, replace the cartridge, then press the ON LJNE key.
  • Page 82 CHAPTER 2 Upper cassette installation request Load the upper cassette, or NO UPPER CASS. Paper cannot be fed from the lower select another paper so”K.2. cassette because the upper cassette Is not loaded. Operator comment (User-defined operator call) .xXx is a messa@ XX..
  • Page 83 CZMPTER 2 4. Error messages If an error occurs and correct printing is not guaranteed, an error message Is displayed. When the ON LINE key is pressed (error skip), printing may be possible in some cases, but correct printing is not guaranteed. To print correctly, take the appropriate action and send the print data again.
  • Page 84 CHAFTER 2 Stalus indication display Description Measure ulllbrr 1,rldl ,vessaer lirld MEMOUY FULL Download overflow Take one of the following The pattern data memory overflowed l”eaS”rlZS: Press the ON LINE key to because there was too much pattern data (downloaded data) for forming receive data from the user-defined characters [character font) external device.
  • Page 85 CMAPTER 2 Description Line error Perform the following LINE EKROR Data from the external devxe was not procedure until the error is received correctly when the serial corrected. interface (RS-232C) was used. 1)Press the ON LINE key to Reference When this error occurs. all resume data reception.
  • Page 86 CHAPTER 2 Status Indication display Description Measure Nurnbrr nr,<, MesbagP na, WORK FULL Turn the power OFF and ON ! Translator working memory overflow again. If the error occurs The specified tranlator cannot find again. advice the customer enough working memory. to add an optional RAM SIMM.
  • Page 87 If this call occurs. turn the power OFF and ON again. If the call occurs again. report the code number, detailed number, and detail of the error occurrence to the service departments of Canon sales companies. a. Printer engine serviceman call 1 .
  • Page 88 CHAPTER 2 b. Controller serviceman call Description MfXlsUre Turn the power OFF and ON Internal ROM checksum err”r i The contents of the ROM on the video again. II” the err”r persists, replace the video controller conlroller are incorrect. PCB. 6F-63 S E K V I C E Internal RAM error Turn the power OFF and ON...
  • Page 89 CHAPTER 2 Status indiration display Description M~W%U-~ MessaRc ,,c,<3 ,mbrr liridl Turn the power OFF and ON 6F-94 S E R V I C E Extended ROM checksum err”r again. If the error cannot be Font data in the extended ROM SIMM corrected, replace the destroyed.
  • Page 90 CHAPTER 2 c. Engine/Controller communication serviceman call Description MeZ5LlIY2 R F - 8 0 SEHVlCE Command status timeout Turn the power OFF and ON The DC controller PCB does not send a again. If the error cannot be status to corrected, replace the video the video controller PCB wlthin controller PCB or DC...

  • Page 91: Outline

    CHAPTER 2 Outline The AC line voltage is supplied to the low-voltage power supply circuit in the power supply by turning the power switch (SWIOl) ON. The low-voltage power supply circuit generates +24 VDC and +5 VDC. The +24 VDC is supplied to the main motor.
  • Page 92 CHAPTER 2 receives a 1st Start command from the DC B. Pick-up/Feed System controller, it runs the pick-up motor The envelope feeder pick-up motor (M4) is forward for about 1.8 second, pauses for 0.1 a stepping motor that rotates forward or seconds, then runs the motor backward for backward and is controlled by the envelope about 2.3 seconds.
  • Page 93 CHAPTER 2 When it receives a 2nd Start command, the envelope feeder driver PCB runs the motor backward for about 2.8 seronds to feed the envelope again. Power-ON Figure 2-51 The upper separation roller is driven via a torque limiter by th? motor, which imparts a tur-ning moment in the direclion of Upper separation roller r o t a t i o n o f the p i c k - u p a n d l o w e r...
  • Page 94 CHAPTER 2 C. Paper Jam Detection Paper jam during pickup or leeding from the envelope feeder is detected in the same way as l’or a printer paper jam detection. See pa@ 2-33 fir details. 2 - 59...
  • Page 95 A. Outline of the Electrical System controller controls the paper feeder driver, outputting paper pick-up commands (1st Start and 2nd Start) at the appropriate timing to the peper feeder driver via the serial line. Figure 2- The paper feeder driver drives the solenoid and motor according to these commands. 53 shows the flow of signals between the feeder and the printer.

  • Page 96: Paper Jam Detection

    CHAPTER 2 B. Pick-up/Feed System C. Paper Jam Detection The paper feeder pick-up motor [M3) is a Paper jam during pick-up or feeding from stepping motor that rotates foward or the paper feeder is detected in the same backward and is controlled by the paper way as for printer paper jam detection.

  • Page 98: Paper Transport System

    CHAPTER 3 THE MECHANICAL SYSTEM This chapter describes mechanical operation as well as disassembly and reassembly procedures of Ihe printer. Note the following precautions during disassembly or reassembly. When you remove the EF-l? cartridge, cover the cartridge with a cloth or put it in a dark place to prevent light from affecting the drum inside the cartridge.
  • Page 100 CHAPTER Right cover Open the printer. the screw. then move the right Remove A. Covers and Panels cover in holding the rear side of the cover, and remove it. Kight cover I_& ‘4) c”“er (2) Upper rover unit (5) Control panel unit Right cover (3) Delivery cover S c r e w...
  • Page 101 CHAPTER 3 4) Kelease the hook holding the upper Upper cover unit cover with a flat-blade screwdriver and Remove the right cover. remove the upper cover unit. 2) Open the delivery cover. Figure 3-3 Figure 3-5 31 fbmove the three XTews. Left cover Open the multi-purpose tray.
  • Page 102 CHAPTER 3 Multi-purpose tray 4. Delivery cover I he c-asscttr. Remove the cassette. 1) Kemow Remove the upper cover unit. 2) Open thr deliwry cover. Remove the right cover. and then the 3) Kemovc thr hing? from the I/O panel. left cover.
  • Page 103 CHAPTER 3 8) Press both ends of the front cover and Exhaust Fan Exhaust fan remove the front cover. Remove the right cover, and lhen the upper cover unit. Perform step 1 to 5 on page 3-18, and remove the video controller unit. Remove the fan cover hook, and then fan cover.
  • Page 104 CHAPTER 3 2. Disassembly and reassembly C. Control Panel Unit 1) Remove the two screws, and then the 1. Removing the control panel unit control panel. from the printer Remove the urmer cover unit. 2) Kemove the two screws. a Control panel (Ij screws 0 Screws Figure 3-15...
  • Page 105 Main Motor Removing the main motor from the printer A. Drive Unit Remove the right cover. 1. Removing the drive unit from the Perform sieps 1 5 on page 3-18, and printer kfOrm steps remove the video controller unit. and 2 on page 3-14. Disconnect the connector.

  • Page 106: Paper Pick-Up Unit

    CHAPTER 3 8) &move the two screws, disconnect the two connectors, and pull the paper pick-up unit forward and out. Paper Pick-up Unit Removing the paper pick-up unit &IWJV~ the cassette. Kcrnc~ve lhr inner cover. Kemovr the upper rover unit. Kernwe he leli cover.
  • Page 107 b. Regist Paper Sensor and Cassette 3) Remove the pin in the projection on the Paper Sensor left end of the regist sensor holder and I) Kemove the cassette pick-up roller. push the projection. 2) Disconnect the connector. Then, take off two claws on the right side, and slide off the regisl sensor holder unit lo the left.

  • Page 108: Cassette Pick-Up Roller

    B. Cassette Pick-up Roller C. Multi-purpose Tray Pick-up Roller 1. Removing the cassette pick-up roller 1. Removing the multi-purpose tray I) ficrllovc IllP ~asselfe. I) Open the multi-purpose tray. 2) SlantI Ihr printrr on its right side. 2) Kenmve the inner cover. 3) 1’1111 orlt lhr casse(lr pick-up roller by 31 Push the sub-pad, hold the knob of the ils knob.

  • Page 109: Separation Pad

    CHAPTER 3 Separation Pad Paper Delivery Unit Removing the separation pad Removing the paper delivery unit lhr multi-purpose tray. upper cover unit. Opc‘n Remove the Hernovc the inner rover. Remove the left cover. Kemovc thr multi-purpose tray pick-up Remove the leaf spring. roller.

  • Page 110: A. Laser/Scanner Unit

    CHAPTER 3 Note: When removing the cable lrom the laser PCB, support the PCB with A. Laser/Scanner Unit your hand. ‘Ihe PCB can be broken 1. Configuration easily it flexed. 7‘1~ laser/scanmr unit sweeps a laser hram across the photosensitive drum. It is Remove the four screws and then the wn[i#~retl as shown below.

  • Page 111: Ep-E Cartridge

    CHAPTER 3 A. EP-E Cartridge 1. Configuration ‘II? El’-I? rartridgc combines a photosensitive drum primary charging roller, developing unit, and drum clraning unit in a single housing. During printing the drum rotates and an invisible rlcctrostatic latent image is formed on its surfaw and then developed into a visible image by Loner-.

  • Page 112: Transfer Charging Roller

    CHAPTER 3 Cleaning the photosensitive drum Transfer Charging Roller Oprn Ihr prinler a n d r e m o v e t h e Open the printer. cartridge. Hook the left side of the transfer Open lhr prot rctive shield. charging roller shaft with the supplied Lihrrally sprinkle t o n e r on a pirre o f green cleaning brush.

  • Page 113: Fixing Unit

    CHAPTER 3 Removing the fixing roller Open the delivery cover. Remove the two screws, lift the fixing A. Fixing Unit unit slightly. and pull it forward and 1. Configuration out. fixing unit fries the toner image onto the paper. I1 is configured as shown below, C2 Fixing unit 3 Screws Figure 3-35...
  • Page 114 CHAPTER 3 Remove the two screws. disconnect the 3. Disassembly and reassembly connector, and remove the left futing a. Fixing roller heater the two hooks holding the cover. I) liel~~~s~ contact cover. and remove the contact (‘ovw. Connector :I) Screws (3) Left fixing cover Figure 3-38 Figure 3-36...
  • Page 115 CfL4FTER 3 6) Rcmovr the Iwo srrews and then the Thermoswitch righi fixing covc~. Pull the fixing roller Kemove the wire cover. heater carc~fully out of the upper roller. Remove the two screws. Release the hook holding the thermoswitch, and remove the hermoswitrh unit, (2 Hook...
  • Page 116 CHAPTER 3 5) Remove the screw and then the thermistor. Figure 3-44 821 Ilcater wire cover Note for reassembly: Figure 3-42 When installing the thermistor, make sure that the sensing surface of the thermistor contacts the surface of the upper fixing 4) Remove the two springs and open the roller uniformly.

  • Page 117: Video Controller Unit

    CHAPTER 3 4) Remove the three screws and then the connecter cover. Controller Unit A. Video 1) Kcmove the right cover. 2) Remove the screw. and “pen the cover. Connector cover 0) Screws Figure 3-47 Screw 2: Cover 5) Remove the four screws and then the Figure 3-45 Disconnect lhe connector.

  • Page 118: Video Controller Pcb

    CHiUTER 3 B. Video Controller PCB 5) Disconnect the connector. (If an optional I) Kanove lhr right cover. hard disk drive is installed. lwo 2) Rcrnovr ihe four screws and then the connectors should be disconnected.) shield case. Then, remove the four screws and video controller PCB.

  • Page 119: Dc Controller Pcb

    CHAPTER 3 DC Controller PCB 4) IWease the two hooks securing the DC controller PCB to the PCB holder, and I’crlbrm slcps 1 a n d 5 o n p a g e 3-18, remove the DC controller PCB. and rcmovc lhc video controller unit. Disconnrc~l the c o n n e c t o r h-on1 the (0 Connwtors (21 DC controller PCB...

  • Page 120: Sensor Pcb

    CHAPTER 3 E. Sensor PCB I) Remove the pick-up motor driver PCH by performing steps 1 and 2 on this page. 2) Disconnect the three ronrvxAors. Figure 3-54 3) Kdease lhe three hooks, and remove Figure 3-53 thr cover. 0 Hooks 0 Cover Figure 3-56 3-21...

  • Page 121: Power Supply

    CHAPTER 3 Power Supply &move 1 he right cover. Remove the three screws and then the connertor cover. iI 1 Screws c2 Connector cover Figure 3-56 Figure 3-57 3) Remove the two screws. disconnect the t w o ronnectors. remcwe the rod, and pull the dower forward and out.

  • Page 122: High-Voltage Power Supply Pcb

    CHAPTER 3 G. High-voltage Power Supply PCB I) l?rmovc (hr cassellr. 2) Stand the prinler on its right side. 3) Iiernow Ihr two screw. release the Iwo hooks, a n d remove the high-voltage c’as?. 0) High-voltage power supply PCB Figure 3-60 3 - 23...
  • Page 123 Figure 3-62 c. Bottom cover Figure 3-6 1 1) Kemnve the right cover and lel’t cover. 2) Remove the rour screws and remove the bottom cover. 0 Bottom cover Q Screw Figure 3-63 3 - 24...
  • Page 124 CHAPTER 3 2. Removing the envelope feeder drive 2. Removing the envelope feeder pick- up motor 1) Remove the Remove lhe t-t&l, lefl. and bottom rovers. right. left, and bottom covers. Disconnect Ihe 2) Disconnect the connector. connectors and remove the screw. ‘0 Conncrlor Screw Connectors...
  • Page 125 CHAPTER 3 the lower separation Removing 4. Removing the envelope feeder pick- up roller roller, upper separation roller, and 1) &move the right, 1eA. and bottom covers. torque limiter Remove the right, left, and bottom covers. 2) Remove the E-rings Remove the screw holding the ground bushings.
  • Page 126 CHAl’l-ER 3 4) Remove the separation roller shalt from the guide. &move the upper separation Note 3 : W h e n a s s e m b l i n g , c h e c k t h e roller and torque limiter h-cm the shaft.
  • Page 127 CHAPTER 3 4) Remove the two screws and then remove drive unit. unit 1. Removing the drive 1) Release the two claws, and remove the ZZ Connectors 0 Cable tie @ Screws @ Drive unit Figure 3-76 0 Claws G) Front rover Figure 3-74 2) Remove the screw, release the two claws, and open the PCB cover.
  • Page 128 CWAFTER 3 2. Removing the paper feeder pick-up Removing the paper feeder driver motor 1) Kemove the drive unit. Remove the screw. release the two 2) Remove the four screws, the E-ring, the claws, and open lhe PCB cover. [See gear, and remove the plate.

  • Page 130: I. Choosing A Location

    CHAPTER 4 INST&LATION This printer was carefully adjusted and strictly inspected before being packed. This makes sure that it works as intended, it must be installed correctly. The service engineer must choose a suitable location, install the printer according to the proper procedures, then fully check the II .
  • Page 131 CHAPTER 4 not install the printer in these places: the sun If the printer must go somewhere sunny, Make sure the requirements below are met the windows must have curtains keep to when installing the printer. The service the sun off. engineer should inspect the place lhe Near magnets or equipment that produces printer will go before delivery.
  • Page 132 CILWTER 4 )ImuamKdh ‘D BIPk3u3~%~Yt If the boxed prinler is brought into the warm from a cold storeroom or delivery truck, condense- lion will form on the printer surfaces. This will cause various problems, such as print defects. To stop this happening, make sure you leave the printer in its box to gradually warm up to room temperature before unpacking it.
  • Page 133 CHAPTERS Cartridge box Lower Styrofoam pad Lower Styrofoam pad , Spacer Protective sheet ’...
  • Page 134 CHAPTER 4 2. Unpacking and installing the cartridge Action Check Remarks Open the small box containing , See F@re 4-4. the cartridge and take the cartridge out. Take the cartridge out of its aluminum bag. Hold the cartridge as shown in See Figure 4-6.
  • Page 135 CHAPTER 4 3. Operation check Remarks Action Check Load lhr upper cassette with paper. Plug the power cord in and Check lhat the density of the test print is right. stitch the printer ON. When the READY indlratnr slops Ilashing, the printrr is standing by: Press Ihr ON LINE key to put the printer off lirw.

  • Page 136: Storage Of Sealed Cartridges

    CHAPTER 4 B. Storage of Unsealed Cartridges Each cartridge contains a photosensitive drum coated with an organic photocon- ductor (OPC) t h a t d e t e r i o r a t e s w h e n A cartridge is affected by its storage exposed to strong light.

  • Page 137: Handling Suggestions

    CHAPTER 4 C. Handling Suggestions 1) Before installing a new cartridge in the printer (or if blank spots appear on prints during use, because of uneven toner distribution) hold the carbidge horimntally and slowly rock it 45” each way about the drum axis.
  • Page 138 CNAPTER 4 6) Do not lurn a cartridge upside down or stand it on end. Always lay it down with its label up. 7) Never take a r&ridge apart Note: If the photosensitive drum gets expost-d to normal light of about 1500 lux for about 5 minutes.
  • Page 139 CHAPTER 5 MAINTENANCE AND SERVICING LISTOFTOOLS .....a 5-2 PAPERS REPLACEMENT SCHEDULE ..I..... S-1 LIST OF LUBRICANTS, CLEANERS ..,....,..
  • Page 140 CHAPTER The k~llowing is a lable of consumables which, over the warranty period of the printer, are expecled to need replacement once or more because of deterioration or damage. The life of the consumables is expressed in terms of the number of prints processed; replace them when they prove to be faulty.

  • Page 141: Standard Tools

    CHAPTER 5 A. Standard Tools the printer are listed below standard tools required for servicing Table 5-2 Remarks T o o l N o . Tool name i Tool case TKN-000 1 With clips. E-Z hook TKN-Ob69 Jumper wire 0.02 mm to 0.3 mm C K - 0 0 5 7 Tbirkness gauge For checking cassette spring...

  • Page 142: Special Tools

    CHAPTER 5 B. Special Tools addition lo Ihe standard tools, the following special tools arc required for servicing the printer. Table 5-3 To01 name Tool No. Shape Application/remarks RANK Printer driver Used for checking the operation trstw of the printer or checking a failure of Ihe lam diode.
  • Page 143 CHAPTER 5 Table 5-4 “. Material name Components Remarks Alcohol: ethyl CZH50H. Cleaning: plastic, Purchase locally (pure or (CH&CHOH rubber, external parts Flammable: keep away denatured) or from flame isopropyl [pure or denatured) MEK (methyl Cleaning: oil and CH,CO-C,II, Purchase locally rthyl ketone) toner stains Highly flammable: keep...
  • Page 144 CHAPTER 5 Printer Cartridge Tool/solvent Remarks P o i n t Photosensi- Toner Never clean the drum wth solvents. not touch or clean the drum unless absolutely necessary. Do not expose the drum to light. F i x i n g u n i t Point Remarks...

  • Page 145: Customer

    CHAPTER 5 The customer should do the following maintenance to maximize printer performance. Table 5-5 Customer maintenance Item Rock the cartridge to redistribute toner. If necessary r&w it. Cartridge Static charge When replacing the cartridge. clean the static charge eliminator rliminator with the green cleaning brush in the printer.
  • Page 146 CHAPTER 6 TROUBLESHOOTING INTRODUCTION..,....6- 1 VI. PAPER TRANSPORT TROUBLRSHOOTING ....6-42 EXPLANATION OF SPECIAL TOOL .
  • Page 147 4. Other points During winter, if the printer is brought into a warm room from a cold one [for instance, A. Initial Check a warehouse), condensation will occur 1. Operating environment inside the printer, causing various Check that: problems. The line voltage does no1 vary more than 10% from the voltage shown on For example: the rating plate.
  • Page 148 CHAPTER 6 Procedure Basic If an image defect or a malfunction occurs. perform the initial check, then follow the basic procedure below. 1. I f t h e p r i n t e r m a l f u n c t i o n s . r e a d section V on troubleshooting.
  • Page 149 CHAPTER 6 C. How to use the Troubleshooting Tables The lroubleshooting tables in this section have been created from general flowcharts. The way of using hese tables is described below, based on the following examples. Example: No AC Power Prcocedure P o s s i b l e rausc Step Check...
  • Page 150 CHAPTER 6 2. Description of control panel Printer Driver Tester Figure 6-2 TEST PRINT Permits the printer to print the pattern Figure 6-l specified by VIDEO SELECT. 1. Outline VIDEO SELECT The printer driver tester allows lhe printer Selects the test pattern to be printed: to operate without being connected to an black hnage, vertical lines, horizontal lines, interface to determine whether the printer...
  • Page 151 CHAPTER 6 which continues even when the PAPER SIZE [LED) tester is disconnected. Indicates the paper size of the cassette in This mode continues until the the paper pick-up unit specified by the PAPER FEED METHOD SELECT switch. printer is turned OFF. Table 6-l LASER POWER CHECK Permits the laser diode to emit light.
  • Page 152 CHAPTER 6 List of signals Table 6-2 Connertor contacl Funclion No. S i g n a l n a m e Jl-1 +24VA +24VA line (outputl J l - 2 T Serial Serial line (input) J l - 3 J l - 4 G N D Procedure the prinler power switch to OFF.
  • Page 153 CHAPTER 6 B. Mechanical Adjustment 1. Checking the nip width of the lower fixing roller The fiing unit does not allow adjustment A. Image Adjustment of the pressure (nip width). If the nip width If an image problem occurs, follow lhe is set incorrectly, a fixing problem may procedure below to perform a test print.
  • Page 154 CIMFTER 6 2. Installing the separation guide [Adjusting the gap between the separation guide and the lower separation roller) U n d e r n o r m a l c o n d i t i o n s . r e m o v e t h e separation guide along with the upper cover.

  • Page 155: Electrical Adjustment

    CIiApTER 6 C. Electrical Adjustment Leadingedgeofpaper 1. Leading edge re&tration adjustment VR202 on The DC c&troller PCBhas been adjusted at the factory. Therefore, it does not require adjustment in the field during installation. However, when the DC controller PCB is replaced, the leading edge registration must be readjusted by using the following procedure.
  • Page 156 CHAPTER 6 J201 IWO2 IC201 J211 J210 TB201 J212 Figure 6 - 1 0...
  • Page 157 CHAPTER 6 This page intentionally left blank 6-11...
  • Page 158 CHAPTER 6 Laser malfunction diagnosis flowchart The laser beam is invisible. When a problem in the laser output occurs, use the laser diagnosis flowchart to determine whether the malfunction was caused with the laser/scanner unit or the DC controller PCB. Notes for the flowchart 1.
  • Page 159 CHAPTER 6 Switch the power ON. When the printer is ready, set the LASER POWER CHECK switch of the driver tester to “ON”. <*y. Set the meter range to 20 VDC. Contact the Set the meter range to 20 VDC. Contact the test leads against the following test leads against the following connector pins on the DC controller PCS:...

  • Page 160: Examples Of Image Defects

    CHAPTER 6 A. Examples of Image Defects I-1 Light l-2 Dark l-3 Completely l-4 All black blank l-5 Large dots l-6 Dtrl on back 01 l-7 Vertical black l-8 Irregular and vertically in streaks smudged vertical Ill%? bands l-9 Irregular and smudged l-10 Blank spots l-11 Solid vertical horizontal bands...

  • Page 161: Troubleshooting Image Defects

    CHAF’TER 6 B. Troubleshooting Image Defects jr-111 Does the print quality improve when the image density is adjusted? the EP-E cartridge is replaced? If the toner image is very Open the printer while a print is being YES made. and open the drum protective ) faint, go to step 7.
  • Page 162 CHAPTER 6 Possible cause Step Check Result Procedure _._______.- -___ High-voltage Perform a test print. About ftve seconds YES Check whether the high- after the main motor starts. does the power supply voltage contact is making voltage between 5210-9 (SLQ2) and good contact with the [Developing J21D-10 (GND) on the DC controller...
  • Page 163 CHAPZ’ER 6 Does the print qualtty improve when Clean the printer drum grounding contact and cartridge contact, then perform one test print. Does the print Iigh-voltage About one second after the main Check whether the hlgh- lower supply motor starts. does the voltage between voltage contact is making ‘CB (Primary 5210.6 (HVRSV and 5210.10 (GND)
  • Page 164 CHAPTER 6 Completely blank I - 3 Possible cause Step Check Result Procedure ._____ DC controller 1 About one second after the main Replace the DC controller PCB. motor starts. does the voltage between J210-6 WRST) and 5210-10 (GNDJ on the DC controller PCB change from about 5 VDC to 0 V? High-voltage Y E S...
  • Page 165 CHAPTER 6 I - 4 All black Procedure Possible cause Check esult 3tep EP-E cartridge Does the print quality improve when Replace the cartridge. the cartrld@ is replaced? High-voltage Perform a test print. About one second Replace the high-voltage power supply after the main motor starts.
  • Page 166 CHAPTER 6 I - 5 Large dots vertically in line Possible cause Step Check Procedure Statir charge the static charge eliminator dirty? eltminator Is the static charge eliminator grounded? Transfer roller. If it is not Is the transfer charging roller dirty? charging roller possible to clean Lt.
  • Page 167 I - 7 Vertical black streaks Check Result Procedure Possible Ca”sP step YES Replace the carlridge. IWE c a r t r i d g e 1 Open the upper cover while printing is performed. and open the protective shield of the rartridge. Are vertical Replace the fting unit.
  • Page 168 CIMPTER 6 Irregular smudged horizontal bands / I - 9 / Check Procedure the bands appear at regular Replace the cartrtdge. intervals? 6-22...
  • Page 169 CHAPTER 6 1 I - 10 Blank spots Is the recommended paper being used? Replace the paper. Instruct the customer to wrap and store the paper to prevent it from becomlng damp. Is the transfer charging roller dirty or YES Replace the deformed? KlllW.
  • Page 170 CHAPTER 6 1 I - 11 1 Solid vertical white lines Check Result Procedure Lark of toner Is there one or more straight vertical : YES Take out the cartridge, rock white streaks of uniform width? it as shown in Section III of Chapter 4 to distribute the toner evenly.
  • Page 171 CHAPTER 6 1 I - 12 Faulty registration Procedure P o s s i b l e cause Steps 1 Check __R”“lti Number of Is the multi-purpose tray or the Advise the user not to load sheets cassette overloaded? the tray or the cassette with excessive amount of paper.
  • Page 172 CHAPTER 6 I- 13 Poor fixing Possible I‘BUSP Sle Check Procedure rranster the transfer charging roller dirty? Clean the roller. If it is not zhargtng roller possible to clean, replace it. Thermistor Oblain Len test prints. Is the last Replace the thermistor. imaee lilhter than the first? Fixing rollers 3 Does Poor fixing occur in a vertical...
  • Page 173 CHAPTER 6 1 I - 14 Distortion I - 15 Missing BD signal Possible cause Step Check Procedure Result Connector Are connertors 5205 and 5206 on the Attach the connectors. DC controller PCB making good contact? Attach the connector. Is conneclor J731 on the BD PCB making good contact? Iasrr/scanner Y E S...
  • Page 174 CNAPTER 6 W h e n performing any of the corrective actions described below, exercise the following precautions: When measuring voltages at designated connector pins, first check the connector for faulty contacts. Remove the expansion ROM PCB, ROM SIMM, RAM SIMM. and font card from the printer.
  • Page 175 CHc’WTER 6 M - 2 No DC Power Check Possible cause Slep Result Procedure Does OVCKIl~~~llt the problem improve when the Y E S Determtne why the over- detection current detection circuit of power switch is turned OFF, then back rirruit the power supply activates.
  • Page 176 CHAPTER 6 / M - 5 Control panel LEDs do not light. Possible caust- Slep Check Procedure p a n e l Does the problem Improve when you Y E S Replace the control panel. Control replace Ihe control panel? Video Replace the video controller controller PCH...
  • Page 177 CItApTER 6 Printer detects a jam and stops even though a paper jam has not M - 7 OCClUTCd Conrwrt Ihe printer driver tester to Regist paper the printer. Is the REGIST SENSOR paper sensor arm is sensor LED of the tester ON’? damaged.
  • Page 178 CHAPTER 6 “11 PAPER OUT’ appears even though paper is loaded in M - 8 the selected paper source. Possible cause Check esult Procedure Has the upper cassette been selected? Proceed to step 5 and subsequent steps. Has the multi-purpose tray been Proceed to step 7 and selected? subsequent steps.
  • Page 179 CHAPTER 6 ~~etects a jam and stops even though a has not paper M - 7 Possible rnusr Operalion mistake _ ,‘. Sensor arm &gist paper paper sensor arm is sensor damaged. If it is replace it: if it is not, replace the regist paper sensor.
  • Page 180 CHAPTER 6 M-9 1 “12 PRINTER OPEN” appears even though the printer is closed. Check Result Procedure upper cover. Y E S Is the upper rover actuator dama.@d? Replace the Upper cover Replace the DC controller c o n t r o l l e r Is the voltage between connector J601-6 (DOPEN) and 5601.10 (GNDI on the pick-up motor driver PCB zero...
  • Page 181 CHAPTER 6 M- 11 “16 TONER LOW” indicator does not light properly. Possible cause Step Check Result Procedure Shake the cartridge following the EP-E c a r t r i d g e 1 The toner is insufficlent. instructions. and load it in to the Prepare a new cartridge.
  • Page 182 1 M - 13 1 Faulty Paper Feeder Pick-up Motor Procedure Check P i c k - u p nwtor 2 driwr PCB driver PCB. If the problem paper frrdrr is replaced? DC controller persists after replacing the PCB, replace the DC controller PCB.
  • Page 183 CHAPTER 6 M- 15 No Paper Pick-up from Upper Cassette Possible cause Step Check Result Procedure Video Place some paper in lhe upper Y E S Replace the video controller controller cassette and perform a test print by PCB. using the printer driver tester. Is the paper picked up from the cassette? ~~~.~ ~,.._...
  • Page 184 CHAPTER 6 M-16 I No Paper Pick-up from Multi-purpose Tray Possiblr CilUSC S1ep Check Result Procedure Vid?” Place some paper on lhe multi-purpose Y E S Replace the video controller rontrollcr lray and perform a test print by using PCB. the printer driver tester.
  • Page 185 CHAPTER 6 M-17 1 No Paper Pick-up from Lower Cassette Step Check R‘ZSUll Procedure f’ossiblr cause ~~~_ ~~~~~~ ~~_~ _ _ _ _ _ _ Y E S Replace the video controller Place some paper m the lower cassette Video rontroller and perform a test print by using the PCB.

  • Page 186: Malfunctions

    CHAPTER 6 M - 19 Poor Output from High-voltage Power Supply Result Procedure Possible cause Step Check Hi&volta@ Is any terminal of the high-voltage Clean the terminals of the rontart ronnertor dirty or rarbontzed? high-voltage contact. tigh-vottag? Does the problem improve when the Replace the high-voltage powrr supply high-voltage power supply PCB is...
  • Page 187 ClMPTER 6 M - 22 “5F-50 SERVICE” Message Possible rause step Check :‘ZSUll Procedure connector Conner1er Reattach the connectors 10 on the DC rontroller PCB and connectors 5741 and 5743 on the connector PCB making good contact? Broken Remove Lhe f&ng unit and measure Check the wiring from thermistor the resistance between connectors...
  • Page 188 1 M - 2 4 / “5F-52 SERVICE” Message Result ~ Procedure Possible cause Step Check C”““WtOr Is connector 5205 on the DC controller -------~co”“ect the connector. PCB making good contact? Power supply 2 Does the voltage between connectors ( Check whether +24 VDC is 5205-6 (24VA) and J205-4 IGND) on present between connectors the DC controller PCB become about...

  • Page 189: Print Paper Jams

    CHAPTER 6 A. Print Paper Jams Paper passes through two major sections in the printer: (11 the pick-up section and (2.1 the fixing and delivery section. The following explains how to troubleshoot jams in each of these serlions. Figure 6-10 Pick-up section 2: Fixing and delivery section 6 - 42...
  • Page 190 CHAPTER 6 Pick-up section Step I’ossiblr C h e c k C~USP ’ Print paper Is the paper curled or wrinkled? Replace the paper. Advise the customer on how to store the paper. Y E S Proceed to step 8. Does this problnn “CI‘UT with casscttc f e e d ?
  • Page 191 CEiApTER 6 Check Result Procedure step Possible cause Envelop? Are the proper envelopes being used in Advise the user to only use the envelope feeder ? the recommended envelooes. I I31 Numberof t Are there too many envelopes in lhe 1 ~~~~_____~ enVt?lopCs envelope feeder ?

  • Page 192: Incomplete Paper Feed

    CHAPTER 6 B. Incomplete Paper Feed T - l Sheets stuck together Check Result Procedure Possible CaUsC Step Paper Advise the user to only use Is the recommended paper being ~ ’ j used? the recommended -zmer. Separation the surface of the separation pad WOI”? Cassette T - 2...

  • Page 193: Switches

    C!HAFTER 6 Switches Figure 6- 11 6 - 46...
  • Page 194 CHAPTER 6 Table 6-5 Function Upper cassette size-sensing switch 1 Upper cassette size-sensing switch 2 Upper cassette size-sensing stitch 3 Lower cassette size-sensing switch 1 (paper feeder) Lower cassette size-sensing switch 2 (paper feeder) Lower cassette size-sensing switch 3 [paper feeder) 6 - 47...

  • Page 195: Sensors And Solenoids

    CHAPTER 6 B. Sensors Solenoids esgure 6-12 6 - 48...
  • Page 196 CHAPTER 6 Table 6-6 Symbol Name Symbol Function Photointerrupter PS201 Delivery paper senscn PS601 cassette papa- sensor Regist paper sensor PS602 PS701 Multi-purpose tray paper end sensor PS702 Multi-puqxse tray paper sensor PS651 Paper feeder paper sensor [paper feeder) PS931 Envelope feeder paper sensor (envelope feeder] ou ~ SL701...

  • Page 197: Motor And Others

    CHAPTER 6 Others C. Motors Figure 6- 6 - 50...
  • Page 198 CWAPTER 6 Table 6-7 Function Symbol Symbol Name Drives the photosensltive drum and feed rollers MOtOI Drives the paper pick-up rollers Drives the paper feeder pick-up rollers (paper feeder) Drives the envelope feeder pick-up rollers Ienvelope feeder) Drives the scanning mirror Fan motor Exhaust fan Heats the upper fixing roller...

  • Page 199: Pc Boards

    D. PC Boards Ngwe 6-14 6 - 52...
  • Page 200 CHAPTER 6 Table 6-8 Function Name umtro1kT PCB Controls the pnnting sequence High-vollage power supply PCB Applies high voltage to the primary and transfer rhaging rollers and the developing cylinder Pick-up motor driver PCL3 Drives the motors and the solenoids Sensor PC0 Relays signals between the sensors.

  • Page 201: Connectors

    CHAPTER E. Connectors 6-15 Figure 6 - 54...
  • Page 202 CHAPTER 6 Figure 6-16 6 - 55...
  • Page 203 CRAPTER 6 Variable resistors, LED indicators, test pins. jumpers. and switches that are made use of when servicing are listed below. Any variable resistors, test pins, etc., not listed below are for factory use only: they require special tools and measuring instruments, and must be set with high precision. Do not touch them when servicing.
  • Page 204 CHAPTER 6 B. High-voltage Power Supply PCB TB403 TB404 TB401 TB402 VR40 TB406 5401 Plgure 6-18 Table 6- 11 Function vFC401 For factory use 6 - 57...

  • Page 205: D. Paper Feeder Driver Pcb

    CHAPTER 6 Motor Driver PCB C. Pick-up Table 6-12 SW602 SW No. FUlICtiOn SW601 Door sensing stitch SW60 1 Test print switch J601 SW602 S W 6 0 3 Cassette size sensing switch sw6o4 (See page 2-28 .I SWfmFi J603 4 1 II J604 J605...

  • Page 206: Appendix

    APPENDIX GENERAL TIMING CHART..A - l SENSOR CIRCUIT....a.. A-11 LIST OF SIGNALS....A-3 VII. PAPER FEEDER DRIVER ..A- 12 GENERAL CIRCUIT..

  • Page 207: General Timing Chart

    Timing chart for two consecutive prints on A4 paper (Cassette feed) GENERAL TIMING CHART Power switch ON (Unit: Seconds) STBY Operation STBY INTR PRINT LSTR Exhaust fan (FMI) ( M l ) 7 Main motor 4k-.3 11 Registpapersensor(PS6G2) 12 Delivery paper sensor (PS201) ( A C ) 13 Primary voltage 1’...

  • Page 208: List Of Signal6

    APPENDlX II. LIST OF SIGNALS A. DC controller N8lUe Abbreviation APCIN AUTOMATIC POWER CONTROL INPUT signal (analog) APCOUT AUTOMATIC POWER CONTROL OUTPUT signal (analog) BEAM DETECTION (Horizontal sync pulse) signal / BDI BD 1NPLJT signal /CBSY COMMAND BUSY signal /CCLK CONTROLLER CLOCK signal /CMD COMMAND signal...
  • Page 209 APPENDIX NSUlle Abbreviation /VDO VIDEO signal VERTICAL SYNC REQUESI signal /VSREQ /VSYNC VERTICAL SYNC sinnal A - 4...

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