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LED Page Printers Service Manual
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Service Guide OL400
Chapter 0 About This Manual
OL400 / 800 / 820 / 830 / 840
LED Page Printers
Adobe Acrobat printable reference copy of the OKIDATA Service Training Manual. 09/17/97
Note: This Adobe Acrobat version of the Okidata Service Training Manual was built with the pictures rendered at 300 dpi, which is ideal for printing, but does not view on most displays well.
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Table of Contents
Page
Service Guide OL400
0 About This Manual Front Cover Copyright & Manual Revision Part Number 1 Product Specifications 1.1 Overview 1.2 Physical Specifications 1.3 Print Specifications 1.4 Paper Specifications 1.5 Power Requirements 1.8 Options 1.9 Consumables 1.10 Reliability Data 2 Principles of Operation 2.1 Printer Overview 2.2 Main Control Function ....2.2.02 Centronics Parallel Interface ....2.2.03 RS-232C Serial Interface ....2.2.04 Optional Font Card ....2.2.05 Optional RAM Board / IC Set 2.3 Printer Control Function ....2.3.02 Operation Panel ....2.3.03 Engine Board ....2.3.04 Power Supply Unit ....2.3.05 Fuser Unit ....2.3.06 Main Motor (Drum Motor) ....2.3.07 LED Head ....2.3.08 Resist Motor ....2.3.09 DC Fan 2.4 Mechanical Operation Description ....2.4.02 OL400 Printing Process ....2.4.03 Process Descriptions 2.5 Sensors And Switches ....2.5.01 Sensors and Switches ....2.5.02 Sensor Functions 3 Maintenance & Disassembly 3.1 Maintenance ....3.1.02 Maintenance Tools ....3.1.03 Maintenance Precautions 3.2 Disassembly/Assembly Procedures ....3.2.01 Upper Cover ....3.2.02 LED Head 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38
Table of Contents ....3.2.03 Interface Board ....3.2.04 RAM Board (Option) ....3.2.05 Main Controller Board ....3.2.06 Engine Controller Circuit Board (LLAB) ....3.2.07 Main Motor ....3.2.08 DC Fan Assembly ....3.2.09 Idle Gears "A" and "B", and the Reduction Gear ....3.2.10 Power Supply Unit ....3.2.11 Upper Unit ....3.2.12 Fusing Unit ....3.2.13 Backup Roller ....3.2.14 Transfer Charger Assembly ....3.2.15 Resist Roller Assembly ....3.2.16 Idle Gear C ....3.2.17 Paper Supply Unit ....3.2.18 Resist Motor ....3.2.19 Engine Connection Board ....3.2.20 Hopping Roller ....3.2.21 Separator ....3.2.22 Ozone Filter 3.3 Adjustments And Service Checks ....3.3.02 Actual Page Count ....3.3.03 Modified Page Count ....3.3.04 Vertical Print Start Position Adjustment ....3.3.05 Setting the LED Head Drive Time ....3.3.06 Voltage Adjustment (+5 vdc) ....3.3.07 Darkness Control 3.4 Cleaning 4 Failure & Repair Analysis 4.1 Overview 4.2 Troubleshooting Updates 4.3 Reporting Problems 4.4 Troubleshooting Tips 4.5 Fault Alarms ....4.5.02 Error Messages Table ....4.5.03 Output SamplesTitle of Section 4.6 Repair Analysis Procedures ....4.6.02 RAP Index ........RAP 01 Printer Does Not Initialize ........RAP 02: Paper Feed Jam Alarm ........RAP 03: Paper Jam Alarm ........RAP 04: Size Tray Error Alarm ........RAP 05: Engine Error - Fusing Problem Alarm ........RAP 06: Engine Error Alarm
Page 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81
Table of Contents ........RAP 07: Light or Blurred Images ........RAP 09: Blank Output ........RAP 10: Vertical Black Stripes ........RAP 11: Repeating Marks ........RAP 12: Blank Spots ........RAP 13: Vertical White Stripes ........RAP 14: Black Page ........RAP 15: Poor Fusing 4.7 Self-Tests A Reference Charts A.1 Overview A.2 Charts ....A.2.01 Main Controller Board (LBPE / LBPF) ....A.2.02 Engine Controller Board (LLAB) ....A.2.03 Operator Panel PCB (LLDC) ....A.2.04 Engine Connection PCB (LLCC) ....A.2.05 Centronics Parallel Interface PCB (LLCP / LLCQ) ....A.2.06 RS-232C Interface PCB (LLRS) ....A.2.07 Expansion RAM Board (optional) (RAMK / RAMH) ....A.2.08 Power Interconnect Board (LLIE) ....A.2.09 Power Supply Unit B Illustrated Parts Listing B.1 Illustrated Parts Listing ....B.1.02 Definitions of Terms ....B.1.03 Parts Ordering Information B.2 Charts ....B.2.01 Items 1 - 7 ....B.2.02 Items 8 - 16 ....B.2.03 Items 17 - 27, and 41 ....B.2.04 Items 28 - 35 ....B.2.05 Items 36 - 40
Page 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110
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Service Guide OL400
Chapter 0 About This Manual
This document may not be reproduced without written permission of the Okidataź Technical Training Group. Every effort has been made to ensure the accuracy of the information contained in this training course. Okidata is not responsible for errors beyond its control. © 1994 by Okidata All rights reserved. First Edition, March 1992 Second Edition May, 1994 Written and produced by the Okidata Technical Training Group Please address any comments on this publication to: Technical Training Group Okidata 532 Fellowship Road Mount Laurel, NJ 08054-3499 Fax Number: (609) 235-2600, ext. 7034 Okilink Login Name: Technical Training
Okidata is a registered trademark of Oki Electric Industry Company, Ltd.; marques deposee de Oki Electric Industry Company, Ltd.; marca registrada, Oki Electric Industry Company, Ltd. Microline is a registered trademark of Oki Electric Industry Company, Ltd. Centronics is a registered trademark of Centronics Inc. Diablo is a registered trademark of Xerox Corporation Epson is a registered trademark of Seiko Epson Corporation IBM is a registered trademark of International Business Machines, Inc. LaserJet and LaserJet+ are registered trademarks of Hewlett Packard Corporation Proprinter is a registered trademark of International Business Machines, Inc. Note: The OL400 Service Training course is part of the OL-Series Training Course and can not be purchased separately. Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
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Service Guide OL400
Chapter 0 About This Manual
Note: The OL400 Service Training course is part of the OL-Series Training Course and can not be purchased separately. THE OL400/800/820/830/840 VIDEO TRAINING KIT covers the following products: OL400 OL800 OL820 OL830 OL840 The following items are included in the kit: OL400 Service Handbook OL800/820 Service Handbook OL830 Service Handbook OL840 Service Handbook Service Training Video OL400/800/820 User's Documentation OL830 User's Documentation OL840 User's Documentation Price: $95.00 P/N 58226902 Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com) ($124.00 Canadian)
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Service Guide OL400
Chapter 1 Product Specifications
1.1
OVERVIEW
1.1.01 General Information The OL400 is a desktop, page printer, using a stationary LED head and dry electrophotography as its exposure and development method. The printer has a resolution of 300 x 300 dots per inch and a continuous print speed of 4 letter-sized sheets per minute. A 512K page memory is standard on the OL400; this can be expanded to 1.5 or 2.5 megabyte with an optional RAM printed circuit board and a memory expansion chip set. Twenty-five resident fonts are included in the OL400 and five optional font cards are currently available. Downloadable fonts can also be used with this printer. The printer can be purchased with either a Centronics parallel interface or an RS-232C serial interface. The OL400's consumables consist of the toner kit, which include a toner cartridge, lens cleaner, and a fuser cleaner pad and the image drum kit which includes the drum cartridge and ozone filter. A letter-size paper tray is included with the printer, and legal, and envelope trays are also available. Paper feeding can be done automatically or manually. The printer will print on a variety of paper types, labels, envelopes, and transparencies. Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
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Service Guide OL400
Chapter 1 Product Specifications
1.2
PHYSICAL SPECIFICATIONS
1.2.01 Outside Dimensions Width: 17.72" Height:5.24" Length: 17.72" 1.2.02 Printer Weight 24 lbs. 1.2.03 LED Array Number of LED Elements - 2560
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Service Guide OL400
Chapter 1 Product Specifications
1.3
PRINT SPECIFICATIONS
1.3.01 Print Specifications Development method: Dry electrophotography Exposure method: LED stationary head 1.3.02 Print Speed First print: 28 seconds maximum (letter size) Continuous print: 4 sheets/minute. (letter size) Warm-up time: 40 seconds maximum [at room temperature 77oF (25oC) and rated voltage (120 VAC)] 1.3.03 Symbol Sets Thirty-nine symbol sets are available with the OL400. 1.3.04 Available Fonts There are twenty-five resident fonts in the OL400. 1.3.05 Paper Feed Method Automatic feed Manual Feed 1.3.06 Paper Delivery Method Face down/face up 1.3.07 Resolution 300 x 300 dots/inch Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
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Service Guide OL400
Chapter 1 Product Specifications
1.4
PAPER SPECIFICATIONS
1.4.01 Paper Types Letter Size: 8.5" x 11" Feed: Automatic or Manual Weight:Minimum 16 lbs Maximum 24 lbs Recommended 20 lbs Legal Size: 8.5" x 14" Feed: Automatic (with optional paper tray) or Manual Weight:Minimum 16 lbs Maximum 24 lbs Recommended 20 lbs Envelope Size:Minimum 3.5" x 7.5" Maximum 7.2" x 10.1" Feed: Automatic (with optional paper tray) or Manual Weight:Minimum 16 lbs Maximum 24 lbs Recommended 20 lbs Labels Manual feed / Face up delivery only Use labels designed specifically for laser/page printers. Transparencies Manual feed / Face up delivery only Must be able to withstand the heat of the fusing process.
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Service Guide OL400
Chapter 1 Product Specifications
1.5
POWER REQUIREMENTS
1.5.01 Input Power 120 VAC +5.5%, -15% 220/240 VAC +/-10% 1.5.02 Power Consumption Approximately 800 W maximum during operation 1.6 ENVIRONMENTAL CONDITIONS 1.6.01 Ambient Temperature and Relative Humidity While operating: 50° to 89° F 10° to 32° C 20 to 80% Relative Humidity While in storage: 14° to 122° F 10° to 50° C 1.6.02 Printer Noise Level During operation: 50 dB maximum At standby: 43 dB maximum 1.7 AGENCY APPROVALS FCC Class B UL 478 Ver.5 CSA 22.2 220
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Service Guide OL400
Chapter 1 Product Specifications
1.8
OPTIONS
1.8.01 RAM Expansion Board 1 megabyte (expands printer memory to 1.5 megabyte) Technician installed
1.8.02 RAM Expansion Chip Set Technician installed 1 megabyte memory expansion chip set used in conjunction with the RAM Expansion Board option. (expands printer memory to 2.5 megabyte)
1.8.03 Font ROM Cards Tax Courier Roman Prestige Elite Letter Gothic
1.8.04 Paper Trays Letter size Legal size Envelope
1.8.05 Interface Boards RS-232C Serial Interface Board Centronics Parallel Interface Board Technician installed Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
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Service Guide OL400
Chapter 1 Product Specifications
1.9
CONSUMABLES
Toner Cartridge Kit (P/N 52104201) One Toner Cartridge One Fuser Cleaner Pad One LED Head Cleaning Kit Image Drum Cartridge (P/N 56106601) One Image Drum Cartridge One Ozone Filter
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Service Guide OL400
Chapter 1 Product Specifications
1.10
RELIABILITY DATA
1.10.01 Printer Mean Time Between Failure (MTBF) Approximately 18,000 pages 1.10.02 Printer Mean Time To Repair (MTTR) Approximately 20 minutes 1.10.03 Estimated Printer Life Approximately 180,000 pages (5 years) 1.10.04 Printer Duty Cycle Approximately 3,000 pages @ 5% print density Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
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Service Guide OL400
Chapter 2 Principles of Operation
2.1
PRINTER OVERVIEW
2.1.01 General Information This section describes the operation of the printer in the order listed below. Main Control Function Printer Control Function Mechanical Operation Sensors and Switches { { { { } } } }
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Service Guide OL400
Chapter 2 Principles of Operation
2.2
MAIN CONTROL FUNCTION
2.2.01 General Information The main control function controls the reception of data from the host interface, processes command signals, processes the image signals, controls the printer unit, outputs data, and controls the operation panel. The main control function consists of the items listed below. CPU 80186-8 Font ROM (512 kbytes) Page buffer (512 kbytes) DRAM controller chip (MSM73V007) Print controller chip (MSM75HJ014) Font controller chip (MSM60791) Programmable I/O (82C55A-2GS) Interface Control Centronics Parallel Interface Board RS-232C Serial Interface Board Optional Font Card Optional RAM
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Service Guide OL400
Chapter 2 Principles of Operation
2.2.02 Centronics Parallel Interface The following operations are carried out during SELECT mode once the STB-N signal is received from the host interface. The BUSY-P signal is sent to the host interface. Simultaneously with fetching data to the Q4 IC at the last transition of the STB signal, the RXIPT-P signal is sent to the CPU to inform it of receipt of data. The CPU reads data received from the Q4 IC by the RD-N signal, and turns off the BUSY signal to the host interface. Upon turning off the BUSY signal, the ACK-N signal is sent to the host interface to acknowledge reception processing.
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Chapter 2 Principles of Operation
2.2.03 RS-232C Serial Interface The 8251 Universal Synchronous/Asynchronous Receiver Transmitter is used as a controller. This serial I/F converts serial data received from the host I/F into parallel data for use by the CPU. It also converts parallel data from the CPU into serial data to be sent to the Host I/F. READY/BUSY or X-ON/X-OFF are used as the communication protocol between the Host I/F and OL400. These can be selected through the Menu. The baud rate, character length, parity check, stop bit, etc., are automatically written into the 82C51 from the menu, so hardware switches are not required.
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Service Guide OL400
Chapter 2 Principles of Operation
2.2.04 Optional Font Card In addition to the twenty-five resident fonts, an optional font IC card is available. The CD-N signal detects the option font card.
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Service Guide OL400
Chapter 2 Principles of Operation
2.2.05 Optional RAM Board / IC Set The expansion RAM board contains 1 Mbyte of memory and sockets for an additional 1 Mbyte. This RAM is in addition to the 512 Kbyte on the Main Control Board.
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Service Guide OL400
Chapter 2 Principles of Operation
2.3
PRINTER CONTROL FUNCTION
2.3.01 General Information The principle hardware components of the printer unit consist of the items listed below. Operation Panel Engine Board Power Supply Unit Fuser Unit Main Motor LED Head Resist Motor DC Fan
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Service Guide OL400
Chapter 2 Principles of Operation
2.3.02 Operation Panel The following components make up the operation panel. 4-bit MPU (LC6543C) LCD control driver (MSM6222B or HD44780) LCD display (16 characters per line) Operation panel sheet LEDs (for online mode indication) Operation buttons The LCD control driver (MSM622B or HD44780) converts 4-bit character codes received from the MPU into 8-bit character codes and retrieves the character pattern data (font) associated with the 8-bit character codes from the internal character generator for display on the LCD. Operation Panel Interface The operation panel is controlled by the operation panel interface located on the Main Control Board via the Engine Board.
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Service Guide OL400
Chapter 2 Principles of Operation
2.3.03 Engine Board The Engine Board is composed of the items listed below. MPU80C51, or MPU83C154 (8-bit CPU) LLAB Revision 11 The MPU 83C154 contains the printer control program in its internal ROM. Therefore, the external ROM (Q1) is not required on Revision 11. MSM73H019GS (80 pin LSI) EPROM (Printer Control Program) EPROM This 1-Kbit electrically erasable PROM (EEPROM) is loaded with the following data: Total number of sheets printed after installation Total number of sheets printed with the current drum Total number of sheets printed with the current fuser Setting of time required from the completion of printing to Stand-by Feed length needed to feed the paper to a printable position. Print starting line on paper (Top margin) LED head drive time. NOTE: The EEPROM preserves the above data while the supply voltage is off. The count of the total number of sheets printed after installation cannot be reset. The count of the total number of sheets printed with the drum currently in use should be taken as a rough measure of the useful life of the drum. It is reset to zero when the drum is replaced by holding down the RESET button and applying power to the printer.
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Chapter 2 Principles of Operation
2.3.04 Power Supply Unit The power supply unit generates the following voltages from the AC input voltage. Voltage +5vdc +12vdc -12vdc +38vdc +5Kvdc -6Kvdc -600vdc -550, -400vdc Purpose Logic Levels, LED Head Drive Voltage Interface Line Voltage Interface Line Voltage Motor/Fan Drive Voltage: High Voltage Source Transfer Charge Voltage Drum Charge Voltage Charge Grid Voltage Developer Bias Voltages
High Voltage Drive The high voltage circuit provides a charge voltage (about -6Kvdc), a transfer voltage (about +5 Kvdc), a grid voltage (about -600 vdc), and a developer bias voltages (about -550vdc and -400vdc). Of these voltages, the first two are generated from a high voltage power supply. The grid connects to the ground via a varistor on the medium-voltage generation circuit (LLAB-PCB). It is kept at about -680 vdc during charging.
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Service Guide OL400
Chapter 2 Principles of Operation
2.3.05 Fuser Unit The fuser unit heater is controlled by a thermistor, a comparator, an LSI, and a CPU to keep the heat roller surface temperature within a predetermined range (about 150 degrees). A thermostat within the fuser unit prevents abnormal temperature rises in the fuser unit if the thermistor fails. NOTE: The CPU checks for a blown or shorted wire in the thermistor at power-on , setting a fuser alarm if an error is detected. The CPU also sets a fuser alarm if the proper temperature is not attained within a specified period of time after power-on. Upon detecting a fuser alarm, the CPU will halt (after printing the current page).
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Chapter 2 Principles of Operation
2.3.06 Main Motor (Drum Motor) The main motor is driven by the motor drive IC (M54646). It is a two-phase motor, driven by the DM-PH1 and DM-PH2 signals.
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Chapter 2 Principles of Operation
2.3.07 LED Head Data on the 2,560 LEDs in the LED head is set in the shift register by the HD CLK signal. The data is loaded in the latch circuit by the HD LD signal. The on/off states of the LEDs are controlled by the signals STB1- STB4; 640 bits are turned on or off at a time.
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Chapter 2 Principles of Operation
2.3.08 Resist Motor The resist motor is driven clockwise (Hopping), then counterclockwise (Paper Feed) by the motor drive IC (LB1731). It is four-phase motor, driven according to the RM-H1, RM-H2, and RM ON-P signals.
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Chapter 2 Principles of Operation
2.3.09 DC Fan The fan is controlled by the FAN ON-P signal from the LSI (MSM73H019). In order for the fan to operate, the signal FAN SENSE-N must be active. NOTE: The fuser and the fan are not driven when the cover is open (reset). If the fan fails to run, the fuser will turn off and an alarm is set. This prevents the next printout. If the signal Fan Sense-N becomes inactive while printing, both the heater and the fan come to a halt after the end of printout of the current page. A fan alarm is generated when the fan is not sensed at power-on time. The fan is driven for 1 minute after the fuser has been turned off. The fan speed is reduced if the next PRINT signal is not received within 1 minute.
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Service Guide OL400
Chapter 2 Principles of Operation
2.4
MECHANICAL OPERATION DESCRIPTION
2.4.01 Basic Principles of Electrophotography The printer turns on the LED head according to the data received from the controller. A charged photoconductive material is exposed to light, forming a latent image on the material. This latent image is developed by toner, with the resultant toner image being transferred to paper and fused for printing. The electrophotographic technology used in this printer is similar to that embodied in general copying machines. The technology comprises the following processes: Charging The surface of the photoconductive material is uniformly charged. Exposure The charged photoconductive material is exposed to light, forming a latent image associated with the print image on the photoconductive material. Developing Charged toner is attracted to the latent image by static electricity, making the image visible. Transfer The toner is attracted to the paper by a static charge. Cleaning Toner that remains on the photoconductive material is returned to the developer. Fusing The toner is fused to the paper using heat and pressure.
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Chapter 2 Principles of Operation
2.4.02 OL400 Printing Process The layout of the electrostatic printing process hardware is shown below.
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Chapter 2 Principles of Operation
2.4.03 Process Descriptions Hopping and Feeding Hopping and feeding are accomplished by the resist motor, hopping roller, and resist rollers. Turning the resist motor in the clockwise direction drives the hopping roller. Turning the resist motor in the counter-clockwise direction drives the feed rollers.
Hopping Hopping is loading paper from the tray. The resist motor turns the hopping roller to advance the paper until the inlet sensor turns on. After the paper has turned on the inlet sensor, the hopping roller advances the paper until it contacts the feed roller (a predetermined length).
Feeding Feeding is transporting the paper through the printer After the end of hopping, the resist motor reverses and the resist rollers transport the paper through the printer.
Charging -6 Kvdc is applied to the charge wire. This causes negative ions to be generated in the vicinity of the charge wire (corona discharge). The negative ions are discharged to the grid plate and the image drum surface. Since the drum surface is not conductive (in the dark), the negative charge (approximately -700 vdc) remains on the drum. To ensure that the drum surface is not charged with more than -700 vdc, a varistor is connected between the grid and ground. If the grid voltage
exceeds -700 vdc, the varistor shunts this excess voltage to ground.
Exposure Light emitted from the LED head is radiated to the image drum surface which is charged with negative ions. The areas of the drum that light is directed to become conductive. This allows the surface potential in these areas to drop from -700 vdc to approximately -100 vdc, thereby forming a latent image associated with the image signals.
Developing The toner supply roller and the development roller are supplied with bias voltages required during the developing process. -550 vdc is supplied to the toner supply roller, -400 vdc to the development roller. The toner supply roller is constructed of a porous material which absorbs toner. Since the development roller charge is more positive than the toner supply roller charge, toner is attracted from the toner supply roller to the development roller. The toner attracted to the development roller is scraped off by the doctor blade, forming a thin coat of toner on the development roller surface. Since the areas of the drum exposed to light (-100vdc) are charged more positive than the toner (-400 vdc), the toner is attracted to the exposed areas of the Image drum surface, making the latent image visible.
Transfer As paper passes by the image drum surface, a positive charge (+5Kvdc), is applied to the charge wire causing the paper to be charged positively through corona discharge. Since the paper is charged more positive than the toner (-100 vdc), the toner is attracted to the paper. ##### Cleaning Upon completion of transfer, residual toner on the image drum is scraped off by the cleaning blade. The residual toner is returned from the toner recovery unit to the developer unit for reuse.
Fusing The toner image is fused on the paper by passing it between the heated roller and the back-up roller. The heated roller is teflon coated and contains a 600 watt quartz lamp. The back-up roller and springs provides a pressure of 3 kg.
A thermistor regulates the heated roller temperature at a predetermined temperature (about 150° C). A thermostat cuts off voltage supply to the heater in the event of abnormal temperature rise. Paper Ejection Paper is ejected from the fuser unit by the back-up roller. If the face-up stacker is closed, paper is routed to the top of the printer for face-down delivery.
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Chapter 2 Principles of Operation
2.5
SENSORS AND SWITCHES Sensors & Switches Sensor Functions ( ( ) )
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Chapter 2 Principles of Operation
2.5.01 Sensors and Switches Inlet Sensor (Photosensor)
Outlet Sensor (Photosensor)
Paper Tray Identification Switches
Paper End Sensor (Photosensor)
Cover Open Switch
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Service Guide OL400
Chapter 2 Principles of Operation
2.5.02 Sensor Functions At Power-On The inlet and outlet sensors are checked for their on and off states at power on. Inlet sensor ON: Inlet jam error (Paper supply jam) Outlet sensor ON: Outlet jam error (Paper eject jam) The thermistor sensor circuit detects if the temperature of the fusing unit reaches the normal temperature within the specified time. When it does not reach the normal temperature within the specified time, the thermistor sensor turns OFF the heater and generates an alarm. During Hopping Whenever the inlet sensor fails to detect paper within a predetermined period of time after a feed command has been issued to the paper supply system (tray), the failure is counted. A hopping operation is then attempted up to three times, and if the paper still fails to feed properly, an inlet jam error is established. During Feeding If the leading part of the paper does not reach the outlet sensor within a predetermined period of time after the start of feeding by the resist motor, a feed jam error is established. Detection of Form Length Errors by the Inlet Sensor Any form length other than 11 or 14 inches will generate a form length error, causing an alarm to be set. To detect the form length, the processor counts the time from when the inlet sensor turns on until it turns off (after the start of the resist motor in the forward direction). Form length detection is not enabled for manually inserted paper or envelopes. Detection of Outlet Jams by the Outlet Sensor Since paper is fed through the printer at a fixed speed, the outlet sensor must remain on for a predetermined length of time. If the sensor remains on in excess of this time, the controller assumes that an exit jam has occurred and an alarm is generated. Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
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Chapter 3 Maintenance & Disassembly
3.1
MAINTENANCE
3.1.01 General Information This section lists the parts replacement, adjustment, cleaning, and lubrication procedures. Disassembly should not be performed unless absolutely necessary. NEVER perform disassembly on a malfunctioning unit until you have followed the failure analysis procedures in Section Four of this Service Handbook. Follow the procedures listed in Adjustments and Service Settings. Adjustments may be required when either consumables or parts are replaced. Failure to perform these procedures could result in unnecessary service calls. Cleaning procedures must be performed correctly if high print quality is to be achieved.
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Chapter 3 Maintenance & Disassembly
3.1.02 Maintenance Tools The following tools are required to service the unit. #2 Phillips Screwdriver (with magnetic tip) Straight-slot Screwdriver Needle Nose Pliers (4 Inch) Digital Multimeter Shop Vacuum (with filter for toner) Cloth (soft and lint-free) All-purpose Cleaner Grease (Dow Corning BR2 or equivalent)
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Chapter 3 Maintenance & Disassembly
3.1.03 Maintenance Precautions DO NOT disassemble the unit if it is operating normally. Before starting disassembly and assembly, always power OFF the unit and detach the power cord. Detach the interface cable, if installed. Do not remove parts unnecessarily. Try to keep disassembly to a minimum. Use the recommended maintenance tools. When disassembling, follow the listed sequence. Failure to follow the correct sequence may result in damaged parts. Screws, collars and other small parts are easily lost. Temporarily attach these parts to their original positions. When handling circuit boards use extreme care. Integrated circuits (microprocessors, ROM, and RAM) can be destroyed by static electricity. Do not place printed circuit boards directly on conductive surfaces. Follow the recommended procedures when replacing assemblies and units. Clear the drum counter when a new drum cartridge is installed. 1. 2. 3. Power OFF the unit. Press and hold RESET while powering ON the unit. The drum counter will reset.
Clear the fuser counter when a new fusing unit is installed. Refer to Section 3.3, Adjustments in this Service Handbook.{ }
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Chapter 3 Maintenance & Disassembly
3.2
DISASSEMBLY/ASSEMBLY PROCEDURES
General Information This section contains the printer disassembly procedures. Only the removal procedures are explained. Reverse the procedure for the installation. This Service Handbook lists the disassembly procedures for major components of the unit. Okidata does NOT recommend disassembling a unit which is operating normally. If you decide to perform disassembly during this training, Okidata recommends that you perform only the disassembly procedures for RSPL items. All other procedures are provided to assist you in identifying parts. It is not likely that you will perform these procedures while servicing the product. Read all notes, cautions, and warnings. They contain important information regarding assembly/disassembly.
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Chapter 3 Maintenance & Disassembly
3.2.01 Upper Cover 1. Turn the power switch OFF and unplug the AC power cord from the outlet and the printer power receptacle at the rear of the printer. 2. Remove the paper tray (1), interface cable (2), and font card (3) (if installed). 3. Lift the operator panel assembly (4) at its bottom and detach it. 4. Pull on the locking collar and then detach the connecting cable (5) from connector J1 (6) of the operator panel PCB (7).
NOTE: 5. Please note that when assembling the operator panel board, you must install the connecting cable with the blue strip to the left. 6. Press the "OPEN" button (8) and raise the stacker cover (9). 7. Remove the two screws (10) and lift the front side of the upper cover (11). As you lift, you will disengage the upper cover from the lower cover at the back of the printer. NOTE: Installation
Open the stacker cover. Align the square slots of the upper cover with the claws of the lower cover. The claws are located on the back of the lower cover, at the left and right sides. Lower the upper cover into position. If the cover is not installed properly, paper jams will result.
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Chapter 3 Maintenance & Disassembly
3.2.02 LED Head 1. Perform this procedure: 3.2.01{ } 2. Push the two blue lock levers (1) toward the rear of the printer and open the LED holder (2). 3. Lift and remove the image drum cartridge (3). To protect the image drum cartridge, please place it back in the styrofoam shipping package. 4. Squeeze the LED head (4) and the LED holder together to ease the tension on the springs (5). Use a screwdriver to remove the two clamps (6) from the claws of the LED head. The claws are located on the top and bottom of the left and right sides of the holder. 5. Gradually remove the LED head, being careful to keep the springs in place.
NOTE: LED Head Replacement After replacing the LED head, set the LED head drive time as described in Section 3.3 of this Service Handbook.{ }
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Chapter 3 Maintenance & Disassembly
3.2.03 Interface Board This procedure may be used to remove both the parallel and serial interface boards. 1. Perform this procedure: 3.2.01{ } 2. Remove the three shield cover mounting screws (1) and detach the shield cover (2) by sliding it forward and lifting it. 3. Remove the interface board mounting screw (3) and the post (4). 4. Lift the interface board (5) to disconnect it from the control board (6) for removal.
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Chapter 3 Maintenance & Disassembly
3.2.04 RAM Board (Option) 1. Perform this procedures: 3.2.01{ } 2. Remove the three shield cover mounting screws (1) and detach the shield cover (2) by sliding it forward and lifting it. 3. Press the hook of the locking circuit board support (3) to unlock the RAM board (4). 4. Lift the RAM board to disconnect it from the main controller board (5) for removal.
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Chapter 3 Maintenance & Disassembly
3.2.05 Main Controller Board 1. Perform these procedures: 3.2.01{ } 3.2.03{ } 3.2.04{ } 2. Remove the three controller board mounting screws (1). 3. Lift the main controller board (2) to disconnect it from the engine control circuit board (3) and remove the main controller board.
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Chapter 3 Maintenance & Disassembly
3.2.06 Engine Controller Circuit Board (LLAB) 1. Perform these procedures: 3.2.01{ } 3.2.03{ } 3.2.04{ } 3.2.05{ } 2. Disconnect the cables (1) from connectors J1, J2, and J5. 3. Open the LED holder to allow access to the engine board mounting screw (2) and remove the mounting screw. 4. Close the LED holder and raise the upper unit. 5. Remove the two remaining mounting screws (3). CAUTION: Be careful not to lose the plastic spacer (4) located between the shield frame and the engine controller board. When installing the engine controller board, be sure that the spacer is in place or the engine controller board will short against the shield frame. 6. Lift the engine controller board (5) to disconnect it from the interconnect board (6). 7. On the engine controller board, press the pawls (7) to unlock and remove the print board cover (8).
NOTE: Replacement When replacing an engine controller board, remove the EEPROM IC2 (9) and the Program PROM Q1 (10) from the old board and mount them on the new board. With LLAB Revision 11, Q1 is not installed because the program is masked in the CPU.
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Chapter 3 Maintenance & Disassembly
3.2.07 Main Motor 1. Perform these procedures: 3.2.01{ } 3.2.03{ } 3.2.04{ } 3.2.05{ } 3.2.06{ } 2. Remove the three mounting screws (1) and detach the shield frame (2). 3. Detach the interconnect board (3). NOTE: The traces which run the entire length of the board are to the front of the printer when the board is installed. 4. Working from the bottom of the printer, remove the motor cover (4) by releasing the two black claws (5). 5. Remove the two high voltage wires from the motor cover. 6. Shift the motor assembly to the left to remove it from the claws (6) of the lower unit. 7. Working on the motor assembly, remove the two mounting screws (7) to remove the main motor (8) from the motor assembly.
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Chapter 3 Maintenance & Disassembly
3.2.08 DC Fan Assembly 1. Perform these procedures: 3.2.01{ } 3.2.03{ } 3.2.04{ } 3.2.05{ } 3.2.06{ } 2. Detach the shield frame (3.2.07 step 6). 3. Remove the DC fan assembly (1).
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Chapter 3 Maintenance & Disassembly
3.2.09 Idle Gears "A" and "B", and the Reduction Gear 1. Perform these procedures: 3.2.01{ } 3.2.03{ } 3.2.04{ } 3.2.05{ } 3.2.06{ } 3.2.07{ } 2. Detach the gears in the following order: idle gear "B" (1), reduction gear (2) and idle gear "A" (3).
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Chapter 3 Maintenance & Disassembly
3.2.10 Power Supply Unit 1. Perform these procedures: 3.2.01{ } 3.2.03{ } 3.2.04{ } 3.2.05{ } 3.2.06{ } 3.2.07{ } 2. Disconnect the two high-voltage cables (1). NOTE: When installing, the cables are keyed for correct placement. The larger connector is to the front of the printer. 3. Remove the four mounting screws (2). 4. Raise the upper unit. 5. Slide the power supply unit (3) towards the front until it comes off the guide (4) of the lower unit. 6. Lift the power supply unit towards you to detach it from the rear claws (5) for removal.
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Chapter 3 Maintenance & Disassembly
3.2.11 Upper Unit 1. Perform these procedures: 3.2.01{ } 3.2.02{ } 3.2.03{ } 3.2.04{ } 3.2.05{ } 3.2.06{ } 3.2.07{ } 3.2.08{ } 3.2.10{ } 2. Place the face-up stacker assembly, located at the rear of the printer, down. Then, lift the upper unit. 3. Remove the paper eject roller assembly mounting screw (1). Slightly lift the paper eject roller assembly (2) at its left end and slide the left end backward using the right end as a pivot. Remove the assembly. 4. Remove the tension springs (3) using a needle nose pliers. 5. Loosen the two mounting screws (4). Lift the upper unit (5). 6. Slide the upper unit to the right and work it free of the right slot to remove it.
CAUTION: Be careful not to drop the fulcrum block (6) and the idle gear (7) when removing the upper unit. Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
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Chapter 3 Maintenance & Disassembly
3.2.12 Fusing Unit WARNING: Allow the printer to cool before servicing the fusing unit. 1. Perform these procedures: 3.2.01{ } 3.2.02{ } 3.2.03{ } 3.2.04{ } 3.2.05{ } 3.2.06{ } 3.2.07{ } 3.2.08{ } 3.2.10{ } 3.2.11{ }
2. Working on the upper unit, remove fuser cleaner pad (1) and the fulcrum block with idle gear (2). 3. Detach the cable (3) from the cable guide (4) of the upper unit. 4. Pass the connector (5) through the slot in the upper unit and work the cable from the upper unit guides. 5. Position the upper unit so its underside is facing you, with the fusing unit (6) at the top. 6. Push the fusing unit against the upper unit until the two lock plates (7) protrude from their slots.
7. Slide the fusing unit to the right until the lock plates disengage from the grooves of the upper unit. 8. Remove the fusing unit, being careful not to lose the springs (8).
CAUTION: Installation The four separator claws must move freely within their grooves or paper jams will result.
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Chapter 3 Maintenance & Disassembly
3.2.13 Backup Roller 1. Perform these procedures: 3.2.01{ } 3.2.02{ } 3.2.03{ } 3.2.04{ } 3.2.05{ } 3.2.06{ } 3.2.07{ } 3.2.08{ } 3.2.10{ } 3.2.11{ } 2. Remove the two mounting screws (1). 3. Use a straight slot screwdriver to detach the sheet guide (2). 4. Remove the backup roller (3).
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Chapter 3 Maintenance & Disassembly
3.2.14 Transfer Charger Assembly 1. Turn the power switch OFF and unplug the AC power cord from the outlet. 2. Press the OPEN button and raise the stacker cover. 3. Remove the image drum cartridge (1). (See 3.2.2) 4. Push the lock lever (2) towards the back of the printer to raise the upper unit (3). 5. Firmly push down and back on the sides of the transfer charger assembly (4) until the lower cover claws are disengaged from the square holes on each end of the transfer charger assembly. 6. Lift and remove the transfer charger assembly.
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Chapter 3 Maintenance & Disassembly
3.2.15 Resist Roller Assembly 1. Perform these procedures: 3.2.01{ } 3.2.02{ } 2. Using a standard screwdriver, release the claws (1) from both sides of the resist roller assembly (2). NOTE: The left claw can be accessed from the bottom of the printer. 3. Lift the resist roller assembly from the printer.
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Chapter 3 Maintenance & Disassembly
3.2.16 Idle Gear C 1. Perform this procedure: 3.2.01{ } 2. Push the lock lever towards the back of the printer to raise the upper unit. 3. Using a needle nose pliers and working from the left side of the printer, push the post (1) to the right. 4. Remove the post. 5. Remove idle gear C (2).
NOTE: The cutout (3) on the post should be positioned to the left side of the printer and on the top when installing.
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Chapter 3 Maintenance & Disassembly
3.2.17 Paper Supply Unit 1. Perform these procedures: 3.2.01{ } 3.2.02{ } 3.2.03{ } 3.2.04{ } 3.2.05{ } 2. Press the lock lever (1) backward and lift the upper unit (2). 3. Disconnect the cable (3) from connector J5 on the engine controller circuit board (4). 4. Remove the two mounting screws (5). 5. Lift the paper supply assembly (6) at its front until the frame of the unit comes off the guide pins, then move the unit towards you for removal.
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Chapter 3 Maintenance & Disassembly
3.2.18 Resist Motor 1. Perform these procedures: 3.2.01{ } 3.2.02{ } 3.2.03{ } 3.2.04{ } 3.2.05{ } 3.2.17{ } 2. Remove the two mounting screws (1). 3. Detach the resist motor (2).
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Chapter 3 Maintenance & Disassembly
3.2.19 Engine Connection Board 1. Perform these procedures: 3.2.01{ } 3.2.02{ } 3.2.03{ } 3.2.04{ } 3.2.05{ } 3.2.17{ }
2. Remove the two mounting screws. (1) 3. On the paper supply unit, press the pointed end of the nylon latch (2), push out the head (3), and remove the latch. 4. Detach the engine connection board (4).
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Chapter 3 Maintenance & Disassembly
3.2.20 Hopping Roller 1. Perform these procedures: 3.2.01{ } 3.2.02{ } 3.2.03{ } 3.2.04{ } 3.2.05{ } 3.2.15{ } 3.2.17{ } 2. Remove the two screws (1) and slide the upper plate assembly (2) until the claws (3) are unlocked. 3. Push the hopping roller shaft (4) to the left to unlock it. 4. Remove the hopping gear pin (5). 5. Remove the E-clips (6). 6. Remove the hopping roller pin (7). 7. Slide the hopping roller shaft to the right and remove the hopping roller (8).
NOTE: When installing, always mount the hopping roller shaft above the ground plate, which is on the left side of the printer.
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3.2.21 Separator 1. Perform these procedures: 3.2.01{ } 3.2.02{ } 3.2.03{ } 3.2.04{ } 3.2.05{ } 3.2.15{ } 3.2.17{ } 3.2.20{ } 2. Hold the separator (1) down and remove the escape lever (2) from the pins on the paper supply unit. Be careful not to lose the separator spring (3).
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Chapter 3 Maintenance & Disassembly
3.2.22 Ozone Filter NOTE: An ozone filter is provided with the image drum cartridge kit. The filter should be replaced when the image drum cartridge is replaced. Using a screwdriver, insert the blade under the lower portion of the fan cover (1) and twist the screwdriver to remove the fan cover. Remove the ozone filter (2) from the fan cover.
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Chapter 3 Maintenance & Disassembly
3.3
ADJUSTMENTS AND SERVICE CHECKS
3.3.01 General Information The first four adjustments (Actual Page Count, Modified Page Count, Vertical Print Start Position and LED Head Drive Time) are performed by changing addresses on the EEPROM located on the Engine Controller printed circuit board. Before performing these adjustments, setup the printer as listed below. 1. Remove the upper cover. 2. Raise the upper unit. 3. Remove the image drum cartridge. 4. Override the cover open interlock switch.
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3.3.02 Actual Page Count General Information The actual page counter counts the number of sheets printed by the printer. Procedure To display the value of the actual page counter, follow this procedure. 1. Power ON the printer while pressing Switch 1 on the Engine Controller Board. The LED (located on the Engine Controller Board) will flash once - then pause (the LED will continuously flash once - then pause) indicating that the printer is in Parameter 1 of the maintenance mode. 2. Press Switch 1 for five seconds. The LED will display the contents of the Parameter1 (Actual Page Counter) register as follows: a. b. The long flash indicates start of count. Short flashes indicate counter contents (most significant digit first). There will be a pause between digits. Upon completion of the count,a long flash will indicate start of count. This process will loop until you press Switch 1 for five seconds. This will cause modified page count to be displayed. (refer to 3.3.02)
c. d. the
Example Actual Page Counter = 235 pages
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3.3.03 Modified Page Count General Information The modified page counter combines the main motor revolution time and the number of printed sheets. Drum replacement is determined by the modified page count. Procedure To check the modified page count, follow this procedure. NOTE: To access the Modified Page Count, you must first view the Actual Page Count. 1. will 2. After viewing the Actual Page Count, press Switch 1 for five seconds. The LED display the contents of the Parameter 1 (Modified Page Count) register. To end this procedure, press Switch 1 for 1 second. The LED will perform one short flash to indicate Parameter 1 is selected.
Example Modified Page Counter = 142 The next step in this table is also the last step in the Actual Page Counter Table Switch 1 Action Press for 5 seconds None None None None Press for 1 second LED Display Description Long Flash Start of Modified Page Count On-Off-Pause 1st Digit = 1 On-Off-On-Off-On-Off-On-Pause 2nd Digit = 4 On-Off-On-Off-Pause 3rd Digit = 2 Long Flash Start of Count Flashes ON/OFF Parameter #1 - Selected
NOTE: The number "0" is represented by 10 flashes The Actual and Modified Page Counters CANNOT be changed.
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3.3.04 Vertical Print Start Position Adjustment General Information The Vertical Print Start Position Adjustment is used to set the top of form position. Use this adjustment to correct print start variations between different OL400 printers, or to achieve a 4.6 mm vertical start position, the default value. A chart of the EEPROM addresses and print start positions is shown below. The Vertical Print Start Position is Parameter 9. Procedure 1. To change the Vertical Print Start Position, follow this procedure. 2. Power ON the printer while pressing Switch 1 on the Engine Control board. The LED will flash continuously, indicating that the printer is in Parameter 1 of the maintenance mode. 3. Press Switch 1 eight times to access Parameter 9. The LED will flash 9 times, indicating Parameter 9 has been selected. 4. Press Switch 1 once for 5 seconds. The contents of the Parameter 9 register will be displayed. 5. To modify the contents of the Parameter 9 register, press Switch 1 (momentarily) to step through the addresses (in accordance with the chart shown below). 6. To end the adjustment, press Switch 1 once for 5 seconds. The LED will flash 9 times, indicating Parameter 9. NOTE: Ten flashes represent the number zero. On the table below, Address 0 comes after Address 15 EEPROM Address / Print Start Position Table EEPROM Address 0 DEFAULT 1 Print Start Position (in mm) 0 +.5 EEPROM Address 8 9 Print Start Position (in mm) -4.0 -3.5
2 3 4 5 6 7
+1.0 +1.5 +2.0 +2.5 +3.0 +3.5
10 11 12 13 14 15
-3.0 -2.5 -2.0 -1.5 -1.0 -0.5
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3.3.05 Setting the LED Head Drive Time General Information This adjustment is necessary only when replacing the LED head. However, if the luminous energy ratings of the new and original LED heads are the same, adjustment is not necessary. The luminous energy rating is on the label on the LED head. Digits three and two (reading from the right) are the drive time rating. The LED Head Drive Time is Parameter 13. Procedure To change the LED Head Drive Time, follow this procedure. 1. Power ON the printer while pressing Switch 1 on the Engine Control board. The LED will flash continuously, indicating that the printer is in Parameter 1 of the maintenance mode. 2. Press Switch 1, twelve times to access Parameter 13. The LED will flash thirteen times, indicating Parameter 13 has been selected. 3. Press Switch 1 once for five seconds. The contents of the Parameter 13 register will be displayed. 4. To modify the contents of the Parameter 13 register, press Switch 1 (momentarily) to step through the addresses (in accordance with the chart shown below). 5. To end the adjustment, press Switch 1 once for five seconds. The LED will flash thirteen times, indicating Parameter 13. LED Drive Time Rating / Drive Time Setting Table Drive Time Rating displayed on LED Head 08 09 10 11 12 13 14 Drive Time Setting Value (Address) 5 4 3 2 1
15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36
0 15 14 13 12
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3.3.06 Voltage Adjustment (+5 vdc) Procedure 1. Remove the upper cover. 2. 3. 4. Remove the shield cover. Remove the main controller board. Use a digital voltmeter which has an input impedance of 10M Ohms and is capable of displaying to the second decimal place or farther. Check the voltage at CN1 of the interconnect board (1) between Pin 31, 5 vdc and Pin27, 0 vdc . The value should be +5.0 vdc (+/-0.1). 6. 7. If adjustment is required, remove the font guide. Change the output voltage by adjusting potentiometer RV1 on the power supply board (2).
5.
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Chapter 3 Maintenance & Disassembly
3.3.07 Darkness Control General Information The Darkness Control is adjusted from the Level 2 Menu. This adjustment changes the degree of character density. Procedure 1. Place the printer off-line. 2. Press and hold MENU more than 2 seconds. The first menu category will appear on the display. 3. Press MENU until "Darkness" appears on the display. 4. Press "+" to toggle through the values until the desired setting is reached. 5. Press ENTER/MENU RESET to store the new setting.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
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Service Guide OL400
Chapter 3 Maintenance & Disassembly
3.4
CLEANING
3.4.01 General Information Remove any dropped toner and dust. Clean inside and around the printer with a vacuum cleaner when necessary. CAUTION: Do not touch the image drum, the LED head, or the LED head connector block.
3.4.02 Cleaning the Static Charge Wire 1. Turn OFF the power supply switch, and press the "OPEN" button and raise the stacker cover. 2. Push the two lock levers backward and lift the LED holder. 3. Clean the static charge wire by moving the blue wire cleaner of the image drum cartridge to the left and right. 4. Place the blue wire cleaner in its original position (to the right).
3.4.03 Cleaning the Transfer Charge Wire CAUTION: Do not press strongly when cleaning or you will break the transfer wire. 1. Push the two lock levers backward to lift the LED holder, and take out the wire cleaner. 2. Close the LED holder. 3. Raise the upper unit. 4. Clean the transfer charger by pressing the wire cleaner to the transfer charger assembly. Slide it several times to the left and right, and clean the transfer wire. 5. Return the wire cleaner to its original position. 3.4.04 LED Lens Array 1. Clean the LED lens array when vertical white lines or "blank" spots appear on the output. 2. Place the LED lens cleaner pad against the LED lens array. 3. Slide the cleaner pad horizontally several times to clean the head. Use a clean area of the pad on each pass. 4. Discard the pad.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 67
Service Guide OL400
Chapter 4 Failure & Repair Analysis
4.1
OVERVIEW
4.1.01 Introduction This section is used to isolate problems to the assembly level. Application problems and detection of faulty components on the printed circuit boards are not addressed. When troubleshooting a defective unit, refer first to Section 4.4{ } of this Service Handbook. This section contains tips on preventing problems as well as a list of common problems. Next, refer to Section 4.5{ problems. }. This section lists the operator panel messages and sample output
Finally, refer to Section 4.6 { }. Repair Analysis Procedures (RAPs) will ask you questions or require you to make observations. The answers to these questions and the results of your observations determine your next course of action. Use the RAP Index to identify which RAP should be used to resolve the problem with the machine. If you encounter a situation that is not addressed by the documentation in this kit, please report the problem to Okidata. Refer to the Service Center Reference Guide for information on contacting Okidata. The following information is provided to detect and analyze failures. Okilink II, Faxable Facts, Technical Service Bulletins Troubleshooting Tips / Common Problems Fault Alarms Output Samples Repair Analysis Procedures* Tests Continuous Print Print Fonts Menu Print Serial Interface Loop Engine
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 68
Service Guide OL400
Chapter 4 Failure & Repair Analysis
4.2
TROUBLESHOOTING UPDATES
4.2.01 General Information Okidata distributes updated troubleshooting information in three ways. Okilink II Faxable Facts Technical Service Bulletins 4.2.02 Okilink II Okilink II is Okidata's Bulletin Board Service. This service is available to all Okidata Certified Service Technicians. Okilink II provides troubleshooting and service information. Technicians can download files, ask questions of Okidata's technical support personnel, and participate in round table discussions about Okidata products and services. Technical Service Bulletins, Recommended Spare Parts Lists,