OKIPAGE 8p /8 LED Page Printer Maintenance Manual ODA/OEL/INT Rev. 2 1997,11,12 All specifications are subject to change without notice. XXXXXXXXTH...
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PREFACE This Maintenance Manual describes the field maintenance methods for LED Page Printers. This manual is written for use by service persons. Please note that you should refer to the Printer Handbook for the handling and operating methods of the equipment.
CONFIGURATION System Configuration The OKIPAGE 8p/8w consists of a control block, a power supply unit, and an engine block. (See Figure 1-1.) ENGINE UNIT Paper Feed Mechanism Hopper Plate Electro-photographic Processor Main High-Voltage Power Supply Board Sub High-Voltage Main Control Board...
Printer Configuration The printer unit consists of the following five hardware components: • Electro-Photographic Processor • Paper Feeder • Main Control Board • High-Voltage Power Supply Board (two Boards) • Power Supply Unit Figure 1-2 is the configuration of the printer unit. Upper Cover Assy EP Unit (Type 6) Top Cover Assy...
Specification (1) Type Desktop (2) Outside dimensions Height 5.9” (150 mm) (excludes protruding Width 12.2” (310 mm) portion) Depth 7.5” (191 mm) (3) Weight 3.8 kg (4) Development method Dry non-magnetic development system Exposure method LED stationary head (5) Paper used <Type>...
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In storage –10 to +43 ˚C 10 to 90% RH (relative humidity) No condensation is permissible. Caution: Temperature and humidity in storage are measured with the OKIPAGE 8p/8w being packed; they are valid for one year. (13) Noise During operation:...
Warning Label Warning labels are affixed to the locations that may cause bodily injury. During maintenance, do work with enough care while following instructions on these warning labels. For OEL For OEL, OKI-INT For Korea For China, TAIWAN 1 - 6...
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OPERATION DESCRIPTION The OKIPAGE 8p/8w consists of a main control board, a high-voltage power supply board, a power supply unit, and an electro-photographic processor. The OKIPAGE 8p/8w receives print data from a higher-level interface and sequentially stores it in memory. The OKIPAGE 8p/8w decodes and edits the received data while storing print data from the interface in memory.
LED head, a main motor, and an electromagnetic clutch. (1) One-chip CPU • OKIPAGE 8p The one-chip CPU is a custom CPU (32-bit internal bus, 16-bit external bus, 28-MHz clock). This CPU has the functions listed in the table below.
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(2) Program ROM Program ROM contains a program for the equipment. EPROM is used as program ROM. When mask ROM in the one-chip CPU explained in (1) above is valid, the EPROM is not mounted. (For details on short wiring setting, see Section 7.2.) (3) DRAM DRAM is used as resident memory.
Power Supply Unit The power supply unit supplies +5 V and +26 V to the main control board according to 230 VAC / 120 VAC. Output voltage Application +5 V Used to generate a logic circuit and a high voltage. +26V Used to drive the motor and electromagnetic clutch.
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(2) Sensors The high-voltage power supply board consists of the high-voltage power supply circuit that supplies power to the electro-photographic processor system and the photosensor that detects a paper feeding system and toners. Figure 2-2 shows the sensor layout drawing. Exit roller Outlet sensor Heat roller...
Electro-Photographic Processor The electro-photographic processor prints out the image data to be sent from the main control board on sheets of paper. Figure 2-3 shows the layout drawing of the electro-photographic processor. (1) Image drum unit The image drum unit makes a toner adhere to the formed electrostatic latent image with static electricity.
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(3) Pulse motor (Main) This pulse motor of 48 steps/rotation is two-phase excited by the signal from the main control board; it performs feeding control by switching normal rotation to reverse rotation or vice versa and turning on/off the electromagnetic clutch. The relationship between the main motor, electromagnetic clutch, resist gear, drum gear, hopping roller is shown in the table below and on the subsequent pages.
Electro-Photographic Process (1) Electro-photographic process The electro-photographic process is outlined below. 1 Charging The surface of the OPC drum is charged negatively and uniformly by applying the DC voltage to the CH roller. 2 Exposure Light emitted from the LED head irradiates the negatively charged surface of the OPC drum.
2.5.1 Explanation of Each Process Operation (1) Hopping As shown in the figure below, the clutch for hopping is turned on/off according to current ON/ OFF to a coil. When the clutch is OFF Spring for resetting Clutch plate Hopping gear Coil Magnetic substance plate...
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(2) Printing and warm-up At warm-up Triple gear Transfer gear Regist gear Idle gear Planetary gear a" Hopping gear Gear A Pulse motor (main) Rotate the pulse motor (main) in the a direction. The planetary gear rotates in the a’ direction, dislocating its position in the a”...
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(3) Charging Charging is performed by applying DC voltage to the charge roller that is in contact with the surface of the OPC drum. High- voltage Charge roller power supply OPC drum (4) Exposure Light emitted from the LED head irradiates the negatively charged surface of the OPC drum. The surface potential of the irradiated surface attenuates to form the electrostatic latent image corresponding to the image signal.
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(5) Development The electrostatic latent image on the surface of the OPC drum is changed to a visible toner image by applying a toner to it. Development is performed in the contact part between the OPC drum and developing roller. 1 The sponge roller negatively charges a toner and applies it to the developing roller.
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(6) Transfer The transfer roller is composed of conductive sponge material. This roller is set so that the surface of the OPC drum and sheets of paper will adhere closely. A sheet of paper is placed on the surface of the OPC drum and the positive charge opposite to the negative charge of a toner is applied from the reverse side by the transfer roller.
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(7) Fusing The transferred unfused toner image is fused to a sheet of paper because heat and pressure are applied when it passes between the heat roller and back-up roller. The Teflon-coated heat roller contains a 400 W heater (Halogen lamp) that heats the heat roller.
Paper Jam Detection The OKIPAGE 8p/8w monitors the paper status when the power supply is on and during printing. In the following cases, the OKIPAGE 8p/8w interrupts the printing process as a paper jam. Printing can be recovered by opening the cover, removing the jammed paper, and closing the cover.
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Normal rotation Pulse motor (main) Reverse rotation Electromagnetic clutch Manual feed sensor Paper sensor Outlet sensor Warm-up Paper feed Printing Operation mode Timing Chart for Paper Feed (Tray Feed) 2 - 20...
Toner Low Detection • Hardware configuration of toner sensor The figure below shows the hardware configuration of the toner sensor. Image drum unit Agitation bar (iron) Magnet Toner sensor lever Hardware Configuration of Toner Sensor • Toner detection method (1) Toner sensor monitoring conditions are shown in the figure below. Toner sensor Magnet draw-in Caution: The toner sensor is not monitored when the drum is inactive.
(2) The basic rotation cycle of the toner sensor is as follows: T time Basic rotation cycle of toner sensor 2.5 sec. Toner low time t1 > 0.6 sec. Toner full time 0.6 sec. > t1 > 0.14 sec. Cover Open Opening the stacker cover turns off the microswitch on the high-voltage power supply board to suspend +5 V supply to the high voltage power supply.
Detecting ID existence In this model, a micro switch may be activated, applying a high voltage to the machine under a state where the cover is slightly opened. In this case, there is a fear that, when a user insert his hand through the opening, he may be shocked unless an ID has been installed.
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Normal printing Abnormal toner sensor waveform Normal printing OKIPAGE 8p/8w ID not Installed / Toner Sensor Error Draft for specification 1. Toner sensor error/ID not Installed state should not be stored in the EEPROM. 2. A shift to ID not Installed and Toner Sensor Error shall be made at cover open or close.
PARTS REPLACEMENT This chapter explains how to replace parts, assemblies, and units in the field. The replacement procedures to be explained here include dismounting, not mounting. When mounting parts, assemblies, and units, reverse the dismounting steps. Precautions for Parts Replacement (1) Be sure to dismount the AC cord and interface cable before replacing parts.
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[Maintenance Tools] Table 3-1 lists the maintenance tools necessary for parts replacement. Table 3-1 Maintenance Tools Maintenance Tools Q'ty Remarks No. 1-100 Philips 2~2.5 mm screw screwdriver No. 2-100 Philips 3~5 mm screw screwdriver No. 3-100 Philips screwdriver No. 5-200 screwdriver Digital multimeter (tester) Pliers Handy cleaner...
Parts Layout This section explains the layout of main parts. [Upper Cover Assy] Spur gear (A) Guide side (R) Guide side (L) Hopper plate Upper cover Figure 3-1 3 - 3...
[Base Frame Unit] LED head Flat cable assy Head spring Top cover assy Pressure roller (B) (Back up roller) Heat assy Paper guide (R) Transfer roller Paper guide (L) Registration roller Side plate M Idle gear heat Paper Hopper holder spring Drive shaft E (eject) Tension plate...
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[Base Plate Unit](OKIPAGE 8p) Power supply unit Main control board High Voltage Power Supply board P6L Base plate assy Figure 3-3-1 3 - 5...
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[Base Plate Unit](OKIPAGE 8w) Power supply unit Main control board High Voltage Power Supply board P6L Base plate assy Figure 3-3-2 3 - 6...
Replacing Parts This section explains how to replace parts and assemblies. 3.3.1 Hopper Plate (1) Remove two claws and dismount hopper plate 1. 3 - 7...
3.3.2 LED Head and Head Spring (1) Open top cover assy 1. (2) Dismount the left clamp and LED head 2. Then, dismount flat cable assy 3. (3) Dismount two head springs 4. 3 - 8...
3.3.3 Transfer Roller (1) Open top cover assy 1 and dismount EP unit (Type 6) 2. (2) Remove the right claw. Then, dismount transfer roller 3, two regist bearings 4, and gear Label 3 - 9...
3.3.4 Upper Cover Assy (1) Turn off the power switch and unplug the AC cord from the AC socket. (2) Disconnect interface cable 1. (3) Open top cover assy 2 and dismount EP unit (Type 6) 3. (4) Move paper guide (L) 4 and paper guide (R) 5 on the rear of the printer to the center. (5) Remove two front claws of upper cover assy 6 and lift upper cover assy 6.
3.3.5 High-Voltage Power Supply Board (P2H/ P6L) (1) Dismount upper cover assy. (See Section 3.3.4.) (2) Remove three screws 1 and remove the cover 2 and draw out high-voltage power supply board 3. (3) Disconnect all the cables 4 from high-voltage power supply board 3 and dismount high- voltage power supply board 3.
3.3.6 Top Cover Assy and Flat Cable Assy (1) Dismount the upper cover assy. (See Section 3.3.4.) (2) Dismount the LED head. (See Section 3.3.2.) (3) Press the left clamp outward and dismount the engagement and top cover assy 1. (Tension spring 2 also comes off at the same time.) (4) Disconnect connector CN6 and dismount flat cable assy 3.
3.3.7 Paper Holder (1) Dismount the upper cover assy. (See Section 3.3.4.) (2) Dismount paper holder 1. (3) Unlock and dismount paper guide (L) 2 and paper guide (R) 3. (4) Remove the claw and dismount hopper spring 4. (5) Remove the claw and dismount stopper spring 5. 3 - 13...
3.3.8 Side Plate M and Idle Gear Perform parts replacement while making the base frame assy stand so that side plate M will face upward. (1) Dismount the upper cover assy. (See Section 3.3.4.) (2) Remove two screws 1 and two claws, then dismount plate side M2. (3) Dismount earth plate 3, two idle gears P 4, idle gear M5, idle gear 3R6, idle gear 2R7, idle gear heat 8, idle gear R 9 and Gear R 0.
3.3.9 Heat Assy This section explains how to dismount the heat assy and parts in the assy. <Dismounting the heat assy> (1) Dismount the upper cover assy. (See Section 3.3.4.) (2) Dismount the high-voltage power supply board. (See Section 3.3.5.) (3) Remove two screws 1, disconnect connector 2, and dismount heat assy 3.
3.3.10 Drive Shaft E (Eject) and Eject Roller (1) Dismount the upper cover assy. (See Section 3.3.4.) (2) Dismount top cover assy. (See Section 3.3.6.) (3) Remove two screws 1 from heat assy (Section3.3.9), life the heat assy, and dismount idle gear E (A) 2 and idle gear E (B) 3.
3.3.11 Pressure Roller B (Back Up Roller) (1) Dismount the upper cover assy. (See Section 3.3.4.) (2) Dismount the high-voltage power supply board. (See Section 3.3.5.) (3) Dismount the heat assy. (See Section 3.3.9.) (4) Dismount the engagement with the left ground, then pressure roller B1. (Two bearing BUs 2 and two bias springs 3 also come off at the same time.) 3 - 19...
3.3.12 Separator Guide (1) Dismount the upper cover assy. (See Section 3.3.4.) (2) Dismount the high-voltage power supply board. (See Section 3.3.5.) (3) Remove four screws 1. (4) Dismount inlet 2 from base frame 3. <Dismounting inlet 2> Insert a screwdriver into the hole on the side of base frame 3, remove the inlet claw from base frame 8, and dismount inlet 2.
3.3.13 Pulse Motor (Main) (1) Dismount the upper cover assy. (See Section 3.3.4.) (2) Dismount the high-voltage power supply board. (See Section 3.3.5.) (3) Dismount side plate M. (See Section 3.3.8.) (4) Dismount the base frame. (See Section 3.3.12.) (5) Remove two screws 1 and dismount pulse motor (main) 2. 3 - 23...
3.3.14 Hopping Shaft Assy (1) Dismount the upper cover assy. (See Section 3.3.4.) (2) Dismount the high-voltage power supply board. (See Section 3.3.5.) (3) Dismount the base frame. (See Section 3.3.12.) (4) Dismount the paper holder assy. (See Section 3.3.7.) (5) Dismount the sheet guide.
3.3.15 Resist Roller (1) Dismount the upper cover assy. (See Section 3.3.4.) (2) Dismount Idle gear R 3 and Gear R 4. (3) Move resist roller 1 to the right and dismount it by lifting. (Two resist bearings 2 also come off at the same time.
3.3.16 Paper Sensor E, Paper Sensor Exit and Toner Sensor Assy (1) Dismount the upper cover assy. (See Section 3.3.4.) (2) Dismount the high-voltage power supply board. (See Section 3.3.5.) (3) Dismount the base frame. (See Section 3.3.12.) (4) Dismount the paper holder assy. (See Section 3.3.7.) (5) Dismount the sheet guide.
ADJUSTMENT This chapter explains adjustment necessary when a part is replaced. This adjustment is made by changing the parameters values set in EEPROM on the main control board. The printer driver or maintenance utility can be used to change these values. Only servicemen and maintenance personnel can use the maintenance utility.
4.1.2 Engine Maintenance Utility See Appendix D. Adjustment When Replacing a Part The table below lists the parts that requires adjustment when they are replaced. Part to be Replaced Adjustment Set the LED head drive time. LED head Set the LED head dot count. (OKIPAGE 8w only) EP unit Reset the drum counter.
4.2.2 Uploading and Downloading EEPROM Data When the main control board is replaced, EEPROM data must be reflected on a new main control board. Use “EEPROM Operations” in the option tab of the maintenance utility to reflect EEPROM data on the new main control board. (See Figure 4-4.) Reflect EEPROM data on the new main control board in the following procedures: (1) Check that the printer and PC are connected by the parallel I/F, then execute the maintenance utility.
PERIODICAL MAINTENANCE Periodical Replacement Parts Table 5-1 lists the part and unit to be replaced periodically. Table 5-1 Routine Replacement Parts Part to be Checked Part Name Replacement Time Remarks Simultaneously Toner cartridge (Type 6) When "Toner Low" is displayed. LED head Consumables EP unit (Type 6)
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(1) Set the LED head cleaner in the LED lens array, as shown in the figure below, and slide the cleaner left and right several time to clean the head. Caution: Do not press the LED head cleaner against the LED lens array. LED lens array LED head cleaner Figure 5-2...
The failure status of the OKIPAGE 4w Plus /4m is displayed on the status monitor of the PC. Take proper action according to the message displayed on the status monitor. (2) LED display The OKIPAGE 8p/8w is equipped with only one LED. This LED indicates one of the following statuss: Printer Status...
LED Functions Status Error (red) Ready (amber) Remark Manual Feed (amber) Ready Undefined Printing contents of buffer by pressing During suspending data pro- Undefined Flash 1 switch two seconds. cessing (in OFF-LINE) Clearing buffer by pressing switch five (Data is left in the buffer) seconds.
Troubleshooting If a trouble occurs in the OKIPAGE 8p8w, troubleshoot according to the following procedures: Trouble Perform detailed Troubleshoot according to Trouble indicated by troubleshooting according "Status Monitor Message List" the message displayed to the troubleshooting flow. (See Section 6.5.1.) on the status monitor.
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Table 6-1 Status Category Status Message Display Content Remedy Code Normal status Warming Up 18 00 Warming-up status Normal operation 00 10 Online (ready) status Online (Ready) Normal operation Power Save Mode 00 20 Power save status Normal operation 10 00 The toner amount of the toner cartridge is small.
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Table 6-1 (Cont'd) Status Category Status Message Display Content Remedy Code Paper size error Paper Size Error 30 00 Paper of improper size was fed. Check the paper. Also check whether more than one sheet of 2.52" (64 mm) L 15.77" (400.56 mm) paper were fed simultaneously.
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Table 6-1 (Cont'd) Status Status Category Category Status Message Status Message Display Content Display Content Remedy Remedy Code Code Device configuration error EEPROM Check Error 60 40 An error occurred during EEPROM check. Replace the main control board. (When replacing the main control board, also adjust EEPROM data.) (See Section 4.2.4.) Option RAM Check Error 60 60...
Some failures cannot be corrected according to the status message trouble list. Troubleshoot these failures according to the following troubleshooting flowcharts: Flowchart No. Item The OKIPAGE 8p/8w malfunctions after the power supply has been turned on. Jam error Paper input jam Paper feed jam...
The OKIPAGE 8p/8w malfunctions after the power supply has been turned on. • Turn the power supply off, then on again. • Is the LED lamp on? • No Is the AC cable connected correctly? • No Connect the AC cable correctly.
[JAM error] Paper input jam • Does a paper input jam occur when the power supply is turned on? • Yes Is the jammed paper on paper sensor E? • Yes Remove the jammed paper. • No Is paper sensor E (manual feed/paper) operating normally? •...
[JAM error] Paper feed jam • Does a paper feed jam occur when the power supply is turned on? • Yes Is the jammed paper on paper sensor E (paper/exit)? • Yes Remove the jammed paper. • No Is paper sensor E (exit/paper) operating normally? •...
Paper size error • Is the paper of the specified size being use? • No Use paper of the specified size. • Yes Is paper sensor E (paper) operating normally? • No Replace paper sensor E (paper) or clean the inlet sensor on the high-voltage power supply board.
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Heat assy error • Turn the power supply off, then on again. • Does the Halogen lamp of the heat assy go on? • No Is the Halogen lamp or thermostat disconnected? • Yes Replace the heat assy, Halogen lamp, or thermostat. •...
6.5.3 Image Troubleshooting This section explains how to troubleshoot when an image problem is output as a result of the printing. Figure 6-3 is an example of image problem output. Symptom Flowchart No. An image is light or blurred entirely. (Figure 6-3, A ) Dark background density (Figure 6-3, B ) A blank paper is output.
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An image is light or blurred entirely. • Is the toner low? (Is "Toner Low" being displayed?) • Yes Supply a toner. • No Is the specified paper being used? • No Use the specified paper. • Yes Is the lens of the LED head dirty? •...
Dark background density • Has the OPC drum being exposed to external light? • Yes Set the OPC drum in the OKIPAGE 8p/8w and wait for about 30 minutes. • No Is the heat roller of the heat assy dirty? •...
Vertical black belt/stripe • Replace the EP unit. • Has this error been recovered? • Yes Caution: After replacing the EP unit, reset the drum counter. (Refer to "Replacing the Drum Cartridge" in "User's Manual".) • No Replace the LED head. •...
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A blank paper is output. • Is the contact plate of the transfer roller in correct contact with the high-voltage power supply board? • No Contact the contact plate of the transfer roller correctly. • Yes Replace the transfer roller. •...
Poor fusing • Is the specified paper being used? • No Use the specified paper. (xerox 4200 (20 lbs)) • Yes Is the bias spring normal? (Tension: 3.25 kg) • No Replace the bias spring. • Yes Are the heater connector of the heat assy and the CN1 connector of the power supply unit connected correctly.
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Vertical white belt/spripe • Is the lens of the LED head dirty? • Yes Clean the LED head. • No Is the contact plate of the transfer roller in correct contact with the high-voltage power supply board? (See Figure 6-5 E .) •...
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Contents A : Toner Supply Roller B : Developing Roller C : Charge Roller D : Cleaning Roller E : Transfer Roller F : Heat Roller Figure 6-4 6 - 20...
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Contents A : Toner Supply Roller B : Developing Roller C : Charge Roller D : Cleaning Roller E : Ground (Drum) Figure 6-5 6 - 21...
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Table 8-2 Base Frame Unit Part Name Part No. Q'ty Remarks Frame Unit Assy 40593201 High-Voltage Power Supply Board P2H 40607401 Paper Sensor E 3PP4083-1191P1 Separator Assy 40721301 Compression Spring S 4PP4083-1246P1 Toner Sensor Assy 3PA4083-1193G1 Pulse Motor 40496401 Ep Unit (Type 6) Consumable Toner Cartridge Unit (Type 6) Consumable...
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Paper Guide (L) 40249401 Paper Holder 1PP4083-1231P1 Paper Sensor Exit 3PP4083-1192P1 Hopper Spring 4PP4083-1247P1 Top Cover Assy 40592101 OKIPAGE 8p (OEL) Top Cover Assy 40592102 OKIPAGE 8w (OEL) Top Cover Assy 40592104 OKIPAGE 8w (ODA) Head Spring 4PP4083-6168P1 LED Head...
Table 8-4 Base Plate Unit Part Name Part No. Q'ty Remarks Base Plate Assy 40592201 Insulation Sheet A 40722501 Power Supply Unit 4YB4049-1853P1 120V Power Supply Unit 4YB4049-1854P1 230V Main Control Board 40681602 For OP 8w (HBY-) Main Control Board 40433802 For OP 8p (HBY-)
Appendix A LOCAL PRINTING (1) The following operation enables the OKIPAGE 8p/8w to print data by itselt. <Operation> With the cover open, turn on the AC switch and then close the cover. The following print patterns are printed. A - 1...
Appendix B PARALLEL INTERFACE (1) Connector • Printer side : 36-pin receptacle Type: 57RE-40360-730B-D29A (Daiichi Denshi) or equivalent • Cable side : 36-pin plug Type: 57-30360 (Daiichi Denshi) or equivalent (2) Cable • Cable length : 6 feet (1.8 m) max. (IEEE std 1284-1994 compliant is recommended for noise prevention.) B - 1...
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(3) Parallel I/F signals Pin No. Signal Name Direction Function (Compatible Mode) → PR DATA STROBE Parallel data sampling strobe DATA BIT - 1 DATA BIT - 2 DATA BIT - 3 ↔ PR DATA BIT - 4 Printer parallel input/output data DATA BIT - 5 DATA BIT - 6 DATA BIT - 7...
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(4) Signal level • LOW : 0 V to +0.8 V • HIGH : +2.4 V to 5.0 V (5) Interface circuit • 8p • 8w a) Receiving circuit a) Receiving circuit R = 3.3KΩ (1.0-KΩ STROBE) R = 3.3KΩ (1.0-KΩ STROBE) b) Sending circuit b) Sending circuit (Open Collector)
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6 7 4 5 2 3 6 7 4 5 2 3 . , - * + & ' . $ , - " * + c) Data sending timing (nibble mode) ACKNOWLEDGE BUSY DATA bit 3 DATA bit 7 FAULT DATA bit 0 DATA bit 4...
Appendix C MAINTENANCE UTILITY OUTLINE OF MAINTENANCE UTILITY The maintenance utility is an application program that operates on Microsoft Windows 3.1 or higher. The maintenance utility has the following functions: • Transmission of menu setting command to initialize and change setting values •...
DETAIL OF EACH FUNCTION Engine Menu Setting Engine Menu Setting is used to set, display, and change the following menu items: (See Figure D-1.) (1) Print Position Used to adjust the print start position. (2) LED Head Marking No. Used to adjust the exposure time of the LED head. (3) LED Head Width Used to specify the LED head dot count.
(4) Printer RAM Check Used to check printer RAM. (5) Printer Name Set Used to set a printer name, "OKIPAGE 8p" or "OKIPAGE 8w". (6) User Used to set a destination default (ODA, OEL, INTL, INTA). See Figure C-3. C - 3...
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About About is used to display the following information: Engine maintenance utility version information Printer version information and memory size information Printer device ID information See figure C-4. Reload Reload is used to reload menu setting values. Exit Clicking the Exit button terminates the maintenance utility. C - 4...
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<Engine Maintenance Driver GUI> Figure C-1 Main Menu Dialog Figure C-2 Test Print Dialog C - 5...
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Oki Data Corporation 4-11-22, Shibaura, Minato-ku, Tokyo 108, Japan Tel: (03) 5445-6162 Fax: (03) 5445-6189 XXXXXXXXTH...
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OKIPAGE8 p LED Page Printer Troubleshooting Manual with Component Parts List (ODA/OEL/INT) All specifications are subject to change without notice.
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CONTENTS OUTLINE..................... 1 TOOLS ......................1 CIRCUIT DESCRIPTION ................2 Outline ........................2 CPU and Memory ....................4 Reset Control ......................6 EEPROM Control ..................... 7 Centronics Parallel Interface ..................8 Front Operator Panel ....................9 LED Head Control ....................10 Motor and clutch control ..................
OUTLINE This manual has been written to provide guidance for troubleshooting of the OKIPAGE8p Printer (primarily for its printed circuit boards), on an assumption that the reader is knowledgeable of the printer. Read the maintenance manual for this printer if necessary. Note: High voltage power supply board and power supply unit containing a high voltage power supply is dangerous.
CIRCUIT DESCRIPTION Outline The circuit of OKIPAGE8p consists of a main control board, a main high voltage power supply board, a sub-high voltage power supply board and a power supply unit. The block diagram is shown in Fig. 3-1. The main control board controls the reception and transmission of data with a host I/f and processes command analysis, bit image development, raster buffer read.
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Motor PLUNGER LED HEAD HEAD1 HEAD2 MOTOR Main PCB NMA- Amber Amber EEPROM Motor Driver MTD2005F OPTION PCB N4A- DRAM 2MB Serial I/F DRAM (NKK3 or 5) 1M x 16 Parallel DRAM CENT Data Bus 1M x 16 (x16) Address Bus DRAM 4MB M-ROM LS07...
CPU and Memory (1) CPU (NKK3 or NKK5) CPU core RISC CPU (MIPS R3000) CPU clock 7.067 MHz, Internal CPU CLK 28.268 MHz Data bus width External 16 bits, Internal 32 bits (2) Program ROM ROM capacity 8M-bytes (Mask ROM) ROM type 64Mbits (4M x 16 bits) Access time...
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D00 to D15 Mask ROM A00 to A25 (4M x 16 bits) <Program> RAS0 RAS1 RAS2 DRAM RAS0 CAS0 (1M x 16 bits) CAS1 RD/WR Main CAS0, 1 control board Option CAS0, 1 WR RAS1, 2 board DRAM 4M Byte RAS1, 2 WR CAS0,1 Figure 3-2 Block Diagram of CPU &...
EEPROM Control The BR93LC46A on the main control board is an electrical erasable/programmable ROM of 64- bit x 16-bit configuration. Data input to and output from the ROM are bidirectionally transferred in units of 16 bits through I/O port (EEPRMDT-P) in serial transmission synchronized with a clock signal from the CPU.
Centronics Parallel Interface The CPU sets a BUSY-P signal to ON at the same time when it reads the parallel data (PDATA1- P to PDATA 8-P) from the parallel port at the fall of PSTB-N signal. Furthermore, it makes the store processing of received data into a receive buffer terminate within a certain fixed time and outputs an ACK-N signal, setting the BUSY-P signal to OFF.
Front Operator Panel Front operator panel have three LED lamps and a switch on the main control board which is connected to by the CPU. The light from the LED lamp can be seen on the Lens Cover through the LED Lens. Ready (Amber) Manual Feed (Amber) Error (Red)
LED Head Control An LED correcting head, which is capable of correcting the illumination of the LED for each dot, is being used in this printer. LED illumination correction function of 16 steps is carried out by using an EEPROM which is installed in the LSI that maintains the LED illumination correction values, and an LED correction drivers (MSM6731BWAF or MSM6732BWAF) together as a pair.
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Normal Mode Printing Timing Chart CLOCKI LOADI DATAI3~0 STRB1I-N STRB2I-N STRB3I-N STRB4I-N First line printing data sent Second line printing data sent First line printing The printing operation is carried out in the following sequence. First, the printing data DATAI3 through DATAI0 are stored, sequentially shifted, in the shift registers of the LED drivers, by the printing data synchronous clock, CLOCKI.
Motor and clutch control The electromagnetic clutch is driven by a control signal from the CPU and the drive circuit shown below. The main motor is driven by the control signals from the CPU and the driver IC. Main Motor Motor +26V OPEN...
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(2) Motor drive control Time T0 to T3 determines the motor speed, while the phase different direction between phase signals DMPH1-P and DMPH2-P determines the rotation direction. DMON-N signal control a motor coil current. According to the polarity of the phase signal, the coil current flow as follows: 1) +26V →...
Fuser Temperature Control For the temperature control by heater control, the variation in the resistance of the thermistor is A/D converted in LSI and the resultant digital value is read and transferred to the CPU. The CPU turns on or off the HTON-N signal according to the value of the signal received from LSI to keep the temperature at a constant level.
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Flowchart of Thermistor Circuit Check START HEATER OFF Short check timer(t16)set Time-out ? Short error TEMP ? Thermistor short error Thermistor error check timer (t2) set Thermistor disconnection check timer (t35) set Heater On Temperature > Tn To constant temperature control Thermistor error check timer (t2) within time...
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Temperature Controlled Temperature Time HEATER ON Temperature table THERMCMP-N Heater control mode Normal operation Fuser Error Check Paper Thickness light 145˚C: 150˚C: medium light 155˚C: medium 160˚C: medium heavy 165˚C: heavy - 16 -...
3.10 Sensor Control The CPU supervises the state of each sensor every 40 ms. HIVOL Main Control Board High Voltage Power Supply Board TNRSNS-N PSIN-N PSOUT-N WRSNS-N Sensor signal Shield Transparent - 17 -...
3.11 Cover Open When the cover is opened, a cover open microswitch is opened. This makes a CVOPN-N signal low, thereby the CPU detects that cover is open. Furthermore, opening the cover stops applying a +5V power to the high voltage power supply part, resulting in stopping all high voltage outputs. HIVOL Main Control Board High Voltage Power Supply Board...
3.12 Power Supply Part (1) Power supply unit An AC power from an inlet is input to Switching Reg. part .AC power is converted to a +26 VDC output and +5 VDC output. Power supply unit ACIN +26V Filter Circuit Switching Reg.
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Control Signals and High Voltage Outputs Control signal name Level Function Makes the part put out a power to TR. +3 to 5 µA +0.5 to 4 KV TR1PWM (PWM) H/L(PWM) Makes the part put out a -750V power to TR. TR2PWM H/L(PWM) Makes the part put out a -1300 KV power to CH.
TROUBLESHOOTING Troubleshooting Table High Voltage Power Supply Board Note: A malfunction of the power supply is not repaired by an agency. The abnormality to be treated here is that of sensors only. Flowchart Manual Feed Ready Failure PC Display Message Error(RED) (amber) (amber)
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Main Control Board Flowchart Manual Feed Ready Failure PC Display Message Error(RED) (amber) (amber) Initialization error B - 1 and not restored Program ROM Flash3 Flash3 Flash3 B - 2 E R R O R error Resident RAM Flash3 Flash3 Flash3 B - 3 E R R O R...
Troubleshooting Flowchart Paper input jams occur frequently. • Is PS4 (Write Sensor ) operating normally? • No Replace PS4. • Yes Is Pin1 of PJ connector in main control board operating normally? • No Replace TR501 or TR502 in main control board. •...
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The message “COVER OPEN” remains displayed on the PC display. • Is CVSW (Cover Open Switch) operating normally? • No Replace CVSW. • Yes Failure of CPU in main control board. The message “TONERLOW” remains displayed on the PC display. •...
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Initialization error and not restored • Replace ROM. • OK? • No Is the 7.065-MHz clock signal being put out to pin 3 of OCS1? • No Replace OSC1 (CST 7.065M). • Yes Failure of CPU Program ROM error • Replace ROM. Resident RAM error •...
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Data sent through the Parallel I/F cannot be received. • Is the signal at Pin 11 (BUSY-P) of CENT connector being at low level? • No Is the signal at Pin 13 (BUSY-P) of Q4 (74LS07) changed as shown below, at data reception? ON-LINE OFF-LINE BUSY-P...
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Drawing List Main Control Board (NMA PCB, Rev. 5) 40433801YA High Voltage Power Supply Board (P2H PCB, Rev.2) 40607401YA High Voltage Power Supply Board (P6L PCB, Rev.2) 40605601YA Option Board (N4A PCB, Rev.2) 40559001YA - 2 -...