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Service Guide OKIPAGE 12i
Chapter 0 Introduction
Front Cover
OKIPAGE 12i // 12in
When it comes to office productivity and efficiency, the OKIPAGE® 12i Series provides tough, fast, reliable printing for power users and small workgroups. Adobe Acrobat printable reference copy of the OKIDATA Service Training Manual. 05/13/98 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 display well on most displays.
Table of Contents
Page
Service Guide OKIPAGE 12i
0 Introduction Introduction 1 Configuration 1.1 System Configuration 1.2 Printer Configuration 1.3 Optional Configuration 1.4 Specification 1.5 Safety Standards ....1.5.1 Certification Label ....1.5.2 Warning Label ....1.5.3 Warning/Caution Marking 2 Operation Description Operation Description 2.1 Main Control Board 2.2 Power Supply/Sensor Board 2.3 Electrophotographic Process ....2.3.1 Electrophotographic Process Mechanism ....2.3.2 Electrophotographic Process ....2.3.3 Process Operation Descriptions ....2.3.4 Revision of LED Head Illumination 2.4 Paper Jam Detection 2.5 Cover Open 2.6 Toner Low Detection 3 Parts Replacement 3.1 Precautions for Parts Replacement 3.2 Parts Layout - [Lower base unit] ........[Upper cover unit] ........[Base unit] 3.3 How to Change Parts ....3.3.1 Upper Cover Assy ....3.3.2 LED Head ....3.3.3 Operator Panel Assy ....3.3.4 Lower Base Unit ....3.3.5 Pulse Motor Main/Drum ....3.3.6 Pulse Motor (Registration) ....3.3.7 Face Up Stacker Assy ....3.3.8 Eject Roller Assy ....3.3.9 Motor Assy ....3.3.10 Hopping Roller Shaft Assy ....3.3.11 Stacker Cover Assy ....3.3.12 Registration Roller ....3.3.13 Roller Transfer Assy ....3.3.14 Fusing Unit ....3.3.15 Back-up Roller ....3.3.16 Sensor Plate (Inlet) ....3.3.17 Sensor Plate (Outlet) ....3.3.18 Manual Feed Guide Assy ....3.3.19 Sensor Plate (Paper Supply) ....3.3.20 Main Control Board M5E-PCB
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 39 40 41 42 43 44 45 46
Table of Contents
Page
....3.3.21 Transformer ....3.3.22 Power Supply/Sensor Board and Contact Assy ....3.3.23 Cassette Guide L Assy ....3.3.24 Cassette Guide R Assy ....3.3.25 Spacer Bearing (L/R) 4 Adjustment 4. Adjustment 4.1 Maintenance Modes and Functions ....4.1.1 User Maintenance Mode ....4.1.2 System Maintenance Mode ....4.1.3 Engine Maintenance Mode ....4.1.4 EEPROM Initialization 4.2 Adjustment When Replacing a Part ....4.2.1 Setting of LED Head Drive Time ....4.2.2 Uploading/Downloading EEPROM data 5 Periodical Maintenance 5.1 Periodical Replacement Parts 5.2 Cleaning ....5.2.1 Cleaning of LED Lens Array ....5.2.2 Cleaning Page Function 6 Troubleshooting Procedures 6.1 Troubleshooting Tips 6.2 Points to Check before Correcting Image Problems 6.3 Tips for Correcting Image Problems 6.4 Preparation for Troubleshooting 6.5 Troubleshooting Flow ....6.5.1 LCD Status Message/Problem List ....6.5.2 LCD Message Troubleshooting ........(1) The printer does not work normally after the power is turned on. ........(2) [JAM error] ............Paper input jam ............Paper feed jam ............Paper exit jam ........(3) Paper size error ........(4) Fusing unit error (ERROR 71) (ERROR 72) (ERROR 73) ........(5) SSIO error (ERROR 74) ........(6) Fan error (ERROR 70) ....6.5.3 Image Troubleshooting ........(1) Images are light or blurred entirely ........(2) Dark background density ........(3) Blank paper is output ........(4) Black vertical belts or stripes ........(5) Cyclical defect ........(6) Prints voids ........(7) Poor fusing ........(8) Vertical belts or streaks ........Figure 6-4 ........Figure 6-5
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 82 83 84 85 86 87 88 89 90 91
Table of Contents 7 Wiring Diagram 7.1 Interconnect Signal Diagram 7.2 PCB Layout and Connector Signal List 7.3 Resistance Check 7.4 Short Plug Setting 8 Parts List Lower Base Unit Upper Cover Unit Base Unit A RS-232C Serial Interface RS-232C Serial Interface B Centronics Parallel Centronics Parallel Interface C Loop Test (RS-232C Interface) Loop Test (RS-232C Interface) D Diagnostics Test 1. Maintenance Modes ....1.1 User Maintenance Mode ....1.2 System Maintenance Mode ....1.3 Engine Maintenance Mode ....1.4 User Factory Set Operation E Multi-Purpose Feeder Maintenance 1. PREFACE ....1.1 Functions ....1.2 External View and Component Names 2. MECHANISM DESCRIPTION - General Mechanism ....2.2 Hopper Mechanism 3. PARTS REPLACEMENT ....3.1 Precautions Concerning Parts Replacement ....3.2 Parts Layout ....3.3 Parts Replacement Methods ........3.3.1 Link ........3.3.2 Separator ........3.3.3 OLEV-11 PCB ........3.3.4 Pulse Motor ........3.3.5 Planet Gear ........3.3.6 Roller-A and B 4. TROUBLESHOOTING - Precautions Prior to the Troubleshooting ....4.2 Preparations for the Troubleshooting ....4.3 Troubleshooting Method ........4.3.1 LCD Status Message List 5. CONNECTION DIAGRAM - Interconnection Diagram ....5.2 PCB Layout 6. PARTS LIST F High Capacity Second Paper Feeder High Capacity Second Paper Feeder Maintenance ....1. OUTLINE - Functions ....1.2 External View and Component Names 2. MECHANISM DESCRIPTION - General Mechanism
Page
92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132
Table of Contents
Page
....2.2 Hopper Mechanism 3. PARTS REPLACEMENT ....3.1 Precautions Concerning Parts Replacement ....3.2 Parts Layout ....3.3 Parts Replacement Methods ........3.3.1 Stepping Motor (Hopping) ........3.3.2 TQSB-2 PCB ........3.3.3 Hopping Roller Shaft Assembly and One-way Clutch Gear 4. TROUBLESHOOTING - Precautions Prior to the Troubleshooting ....4.2 Preparations for the Troubleshooting ....4.3 Troubleshooting Method ........4.3.1 LCD Status Message List 5. CONNECTION DIAGRAM ....5.1 Interconnection Diagram ....5.2 PCB Layout 6. PARTS LIST ....2nd Tray ASSEMBLY ....SECTION 1 CABINET & CASSETTE ASSEMBLY ....SECTION 2 MECHANICAL ASSEMBLY ....2nd Tray Parts List G Network Option Board Maintenance 1) Connector 2) Cable 3) Signal 4) Appearance 5) Physical dimensions 6) List of protocols (7) TCP/IP 8) Netware 9) EtherTalk 10) OKI Original Port 11) Others 12) Setup 13) Troubleshooting
133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165
Page: 2
Service Guide OKIPAGE 12i
Chapter 0 Introduction
Introduction
This Service Handbook describes the field maintenance methods for OKIPAGE 12i Digital LED Printer. This manual is written for use by the maintenance personnel. Please note that you should refer to the Printer Handbook and Printer Setup for the handling and operating methods of the equipment.
Copyright 1998, 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 OKIPAGE 12i
Chapter 1 Configuration
1.1 System Configuration
OKIPAGE 12i consists of control and engine blocks in the standard configuration, as shown in Figure 1-1. In addition, the options marked with asterisk (*) are available.
Figure 1-1
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Service Guide OKIPAGE 12i
Chapter 1 Configuration
1.2 Printer Configuration
The printer unit consists of the following hardware components:
l l l l l
Electrophotographic Processor Paper Feeder Controller Operator Panel Power Supply Unit
The printer unit configuration is shown in Figure 1-2.
Copyright 1998, 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 OKIPAGE 12i
Chapter 1 Configuration
1.3 Optional Configuration
The options shown below are available for use with OKIPAGE 12i. These are available separately from the printer unit. (1) High Capacity Second Paper Feeder
(2) Multi-Purpose Feeder
(3) 1 MB Memory Expansion Board
(4) RS-232C Serial Interface Board
(5) Network Interface Board
(6) DRAM SIMM Memory DRAM SIMM memory is available with memory of 1 MB (min.) to 32 MB (max.). The access time of SIMM memories are 60ns, 70ns, 80ns, and 100ns.
(7) Flash SIMM Flash SIMM is available with memory of 4 MB and 8 MB.
Copyright 1998, 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 OKIPAGE 12i
Chapter 1 Configuration
1.4 Specification
(1) (2)
Type: Outside dimensions
Desktop Height: 7.9" (200 mm) Width 13.6" (345 mm) Depth 15.7" (400mm) 22 lbs. (10 kg)
(3) (4) (5)
Weight
Development method Dry electrophotography LED stationary head Exposure method Paper used l Standard paper - Xerox 4200 (20 lbs) l Application paper (manual face-up feed) - Label - Envelope - OHP paper (Transparency) l Standard Letter Legal * [*Without Mutli-Purpose Feeder (Option)] Legal-13* Executive -COM-10** [**manual feed and Multi-Purpose Feeder (Option) only] Monarch** DL** C5** A4 B5 (JIS) A6
l Applicable sizes - Width: 3.87" x 8.5" (116 to 216 mm) - Length: 5.83" to 14" (148 to 355.6 mm)
2 - Automatic feed: 16 to 28 lbs (60 to 135 g/m ) - Manual feed: Label, OHP paper (transparency), Envelope (24 to 28 lbs.)
(6)
Printing speed:
First print: 12 seconds typical for the Letter size paper. [Except Second Paper Feeder (8.8PPM), Multi-Purpose Feeder (8.3ppm)]. o o Warm-up time: 55 seconds typical at room temperature [68 F (20 C), AC 120/230 V]. First page print time: 9 seconds typical for the Letter size paper after warm-up. Automatic feed or manual feed Face down/face up 600 dpi x 600 dpi (true) 600 x 1200 dots/inch graphics 120 VAC +/- 5%, -15% 230 VAC +/-10% Peak: Approx. 515W (120VAC); Approx. 520W (230VAC) Typical operation: Approx. 231W (120VAC); Approx. 250W (230VAC) Idle: Approx. 65W (120VAC); Approx. 56W (230VAC) Power save mode: Approx. 14W (120VAC); Approx. 14W (230VAC)
(7) (8) (9)
Paper feeding method: Paper delivery method Resolution
(10) Power input
(11) Power consumption
(12) Temperature and humidity In operation 50-90 (10-32) 20-80 77 (25) Power off mode During Storage 32-110 14-110 (0-43) (-10-43) 10-90 80.4 (26.8) 35.6 (2) 10-90 --------Unit o F o C %RH o F o C o F o C
Temperature Humidity Maximum wet bulb temperature
Minimum difference 35.6 between wet and (2) dry bulb temperatures
1. Storage conditions specified above apply to printers in packed condition. 2. Temperature and humidity must be in the range where no condensation occurs. (13) Noise During operation: 50 dB (A) or less Standby: 38 dB (A) or less Quite mode: Back ground level Toner cartridge kit - 2,000 (5% duty) ---- 45g cartridge kit Image drum cartridge - 20,000 (at continuous printing); 14,000 (3 page/job) without Power Save
(14) Consumables
Copyright 1998, 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 OKIPAGE 12i
Chapter 1 Configuration
1.5 Safety Standards 1.5.1 Certification Label 1.5.2 Warning Label 1.5.3 Warning/Caution Marking
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Service Guide OKIPAGE 12i
Chapter 1 Configuration
1.5.1 Certification Label
The safety certification label is affixed to the printer in the position described below.
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Service Guide OKIPAGE 12i
Chapter 1 Configuration
1.5.2 Warning Label
The warning labels are affixed to the sections which may cause bodily injury. Follow the instructions on warning labels during maintenance.
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Service Guide OKIPAGE 12i
Chapter 1 Configuration
1.5.3 Warning/Caution Marking
The following warning and caution markings are made on the power supply/sensor board.
* No fuse is mounted here for 200V series. ENGLISH - Heatsink and transformer core present risk of electric shock. Test before touching. FRENCH - Le dissipateur thermique et le noyau du transformateur présentent des risques de choc électrique. Testez avant de manipuler. SPANISH - Las disipadores de color el núcel del transformador pueden producir un choque eléctrico. Compruebe antes de tocar. PORTUGUESE - O dissipador de calor e o núcleo do fransiormador apresentam risco de choque elétrico. Teste antes de focar. ENGLISH - Circuits maybe live after fuses open. FRENCH - Il se peut que les circuits soient sous tension une fois que les fusibles ont éfé rerirés. SPANISH - Las circuitos pueden estar activos una vez que se hayan abierio los fusibles. PORTUGUESE - Os circuitos podem estar energizados após os fusiveis se queimarem.
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Service Guide OKIPAGE 12i
Chapter 2 Operation Description
Operation Description
OKIPAGE 12i consists of a main control board, a power supply/sensor board, an operator panel, an electrophotographic process mechanism, and revision for illumination of LED head. The main control board receives data via the host I/F, it then decodes, edits and stores the data in memory. After completing the editing of a single page of data, it references the font memory and generates bit image data, which is transferred to the LED head in one dot line units. Through the electrophotographic process mechanism, the data is printed on the paper. The operator panel is used for operations and status display. OKIPAGE 12i block diagram is shown in Figure 2-1.
Figure 2-1 OKIPAGE 12i Block Diagram
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Service Guide OKIPAGE 12i
Chapter 2 Operation Description
2.1 Main Control Board
The main control board consists of a single chip CPU, two program/font ROMs, four DRAMs, an EEPROM, a host interface circuit, and a mechanism driving circuit.
(1) Single chip CPU
The single chip CPU is a custom CPU (32-bit internal bus, 32-bit external bus, 28.24-MHz clock, with input frequency from a 7.06-MHz clock) which incorporates the RISC CPU and its peripheral devices, and has the following functions:
Built-in Device Chip select controller Bus controller DRAM controller DMA controller Parallel interface controller Serial interface controller Video output port LED STB output port Timer
Function Control of ROM, DRAM and I/O device.
Transfer of image data from DRAM to video output port. Control of Centronics parallel interface. Control of RS-232C serial interface. Controls LED head.
Generation of various control timing Monitoring of paper running and paper size. Control of operator panel, EEPROM, and options. Input and output of sensor and motor signals.
Serial I/O port I/O Port
(2) Program and Font ROMs
The Program and Font ROMs store the equipment program and various types of fonts. Mask ROM is used as Program and Font ROMs. The mounting locations of these Program and Font ROMs vary depending on the type of the ROMs.
(3) DRAM
The DRAM is a 2MB resident memory on the main control board that stores edited data, image data, DLL data and macro data.
(4) EEPROM
1,024-bit Electrically Erasable PROM (EEPROM), is loaded with the following kinds of data:
l l l
Menu data Various counter data (page counter, drum counter) Adjusting parameters (LED head drive time, print start position, paper feed length)
(5) Parallel Interface
Parallel data is received from a host system via parallel interface which conforms to the IEEE 1284 specification.
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Service Guide OKIPAGE 12i
Chapter 2 Operation Description
2.2 Power Supply/Sensor Board
The power supply/sensor board consists of an AC filter circuit, a low voltage power supply circuit, a high voltage power supply circuit, heater drive circuit, and photosensors.
(1) Low Voltage Power Supply Circuit
This circuit generates the following voltages.
Output voltage Application
+5 V +38 V +8V -8V + 3.3 V
Logic circuit supply voltage. Motor and fan drive voltage and source voltage for high-voltage supply. RS-232C line voltage. RS-232C line voltage and PS board supply voltage. LED head supply voltage
(2) High Voltage Power Supply Circuit
This circuit generates the following voltages required for electrophotographic process from +5 V, according to the control sequence from the main control board. When cover open state is detected, +5 V supply is interrupted automatically to stop the supply of all high-voltage outputs.
Output Voltage Application
CH DB SB CB TR
-1.3 KV -265 V/+300 V -500 V/ 0 V +400 V/+3.5 KV +500 V to +3.5 KV/-1100 V
Voltage to be applied to charge roller. Voltage to be applied to a developing roller. Voltage to be applied to a sponge roller. Voltage to be applied to a cleaning roller. Voltage to be applied to a transfer roller. (Variable)
(3) Photosensor
The photosensor mounted on this power supply/sensor board monitors the status of paper being fed through the printer during printing.
The sensor layout diagram is shown in Figure 2-2 below.
Figure 2-2
Sensor
Function
Sensing State
Inlet sensor 1
Inlet sensor 2 Paper sensor
Detects the leading part of the paper and gives the ON: Paper exists. monitor timing for switching from hopping operation OFF: No paper exists. to feeding operation. Monitors paper feeding situation and paper size based on the paper arrival time and running time. Detects the paper width. ON: A4 or larger. OFF: Smaller than A4. Detects the leading portion of the paper. Monitors ON: Paper exists. paper feeding situation. OFF: No paper exists. Monitors paper feeding and size according to the time of arrival to and leaving past the sensor. Detects the lack of toner. ON: Paper exists. OFF: No paper exists. -----
Output sensor
Toner sensor
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Service Guide OKIPAGE 12i
Chapter 2 Operation Description
2.3 Electrophotographic Process 2.3.1 Electrophotographic Process Mechanism 2.3.2 Electrophotographic Process 2.3.3 Process Operation Descriptions 2.3.4 Revision of LED Head Illumination
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Service Guide OKIPAGE 12i
Chapter 2 Operation Description
2.3.1 Electrophotographic Process Mechanism
This mechanism actuates the printing of image data supplied by the main control board on the paper by electrophotographic process. The layout of the electrophotographic process mechanism is shown in Figure 2-3.
(1) Image Drum Unit
The image drum unit consists of a sensitive drum, a charger, and a developer. The unit forms a toner image on the sensitive drum, using a electrostatic latent image formed by the LED head.
(2) Registration Motor
The registration motor is a pulse motor of 48 steps/rotation with two-phase excitement by the signal from the main control board. It drives the hopping and registration rollers via two one-way clutches according to the direction of rotation.
(3) Main (Drum) Motor
The main or drum motor is a pulse motor of 48 steps/rotation with two-phase excitement by the signal from the main control board and is the main motor of this mechanism.
(4) LED Head
Image data for each dot line from the main control board is received by the shift register and latch register. The 4992 LED's are driven to radiate the image data on the image drum.
(5) Fuser
The fuser consists of a heater, a heat roller, a thermistor and a thermostat. The AC voltage from the power supply/sensor board is applied to the heater controlled by the HEATON signal from the main control board. This AC voltage heats the heater. The main control board monitors the heat roller temperature via the thermistor, and regulates the heater roller to keep it at a designated temperature in the menu, depending on the thickness of the paper (tray 1&2: light=165°C, medium light=170°C, medium=175°C, medium heavy and heavy=195°C; manual feeding and power envelope feeder: light=175°C, medium light=180°C, medium=185°C, medium heavy=190°C, heavy=195°C, transparency = 160°C) by connecting or disconnecting the AC voltage supply to the heater. When an abnormal rise of the heater roller temperature takes place, the thermostat of the heater voltage supply circuit becomes active and forcibly cuts the AC voltage supply. The temperature setting of the fuser can be changed through operator panel setting.
Copyright 1998, 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 OKIPAGE 12i
Chapter 2 Operation Description
2.3.2 Electrophotographic Process
The electrophotographic processing is outlined below. The electrophotographic printing process is shown in Figure 2-4 (see below).
1 Charging
The surface of the image drum is charged uniformly with a negative charge by applying the negative voltage to the charge roller.
2 Exposure
Light emitted from the LED head irradiates the negatively charged surface of the image drum. The surface potential of the irradiated portion of the image drum surface becomes lower, forming the electrostatic latent image associated with the print image.
3 Developing and toner recovery
When the negatively charged toner is brought into contact with the image drum, it is attracted to the electrostatic latent image by static electricity, making the image visible. At the same time, the residual toner on the image drum is attracted to the developing roller by static electricity.
4 Transfer
When paper is placed over the image drum surface, the positive charge which is opposite in polarity to that of the toner, is applied to the reverse side of the paper by the transfer roller. The toner is attracted by the positive charge and is transferred onto the paper. This results in the transfer of the toner image formed on the image drum onto the paper.
5 Temporary cleaning
Residual toner which remains on the image drum without being transferred is evened out by the cleaning roller and is temporarily attracted to the cleaning roller by static electricity.
6 Fusing
The toner image transferred onto the paper is fused to the paper by heat and pressure. An electrophotographic process timing chart is shown in Figure 2-5 (see last chart below).
Figure 2-4
Figure 2-5
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Service Guide OKIPAGE 12i
Chapter 2 Operation Description
2.3.3 Process Operation Descriptions
(1) Hopping and Feeding Hopping and feeding motions are actuated by a single registration motor in the mechanism as shown below:
The registration motor turning in direction "a" drives the hopping roller. The registration motor turning in direction "b" drives the registration roller. The registration and hopping gears have one-way bearing, so turning any of these gears in the reverse direction will not transmit the motion to the corresponding roller. (a) Hopping 1 For hopping, the registration motor turns in direction "a" (clockwise direction) and drives the hopping roller to advance the paper until the inlet sensor turns on (in this case, the registration gear also turns, but the registration roller is prevented from turning by the one-way bearing). 2 After inlet sensor is turned on by the paper advance, the paper is further advanced to a predetermined distance until the paper hits the registration roller (the skew of the paper can thus be corrected).
(b) Feeding 1 When hopping is completed, the registration motor turning in direction "b" (counter-clockwise direction) drives the registration roller to advance the paper (in this case, the hopping gear also turns, but the hopping roller is prevented from turning by the one-way bearing). 2 The paper is further advanced in synchronization with the print data.
(2) Charging Charging is actuated by the application of the DC voltage to the charge roller that is in contact with the image drum surface.
The charge roller is composed of two layers, a conductive layer and a surface protective layer, both having elasticity to secure good contact with the image drum. When the DC voltage applied by the power supply exceeds the threshold value, charging begins. The applied voltage is proportional to the charge potential, with offset of approximately -550V.
(3) Exposure Light emitted by the LED head irradiates the image drum surface with a negative charge. The surface potential of the irradiated portion of the image drum drops, forming an electrostatic latent image associated with the image signal.
The image drum is coated with an underlayer (UL), a carrier generation layer (CGL), and carrier transfer layer (CTL) on
aluminum base. The organic photo conductor layer (OPC), comprising CTL and CGL, is about 20 mm thick.
The image roller surface is charged to about -750 V by the contact charge of the charge roller. When the light from the LED head irradiates the image drum surface, the light energy generates positive and negative carriers in the CGL. The positive carriers are moved to the CTL by an electrical field acting on the image drum. Likewise, the negative carriers flow into the aluminum layer (ground). The positive carriers moved to the CTL combine with the negative charges on the image drum surface accumulated by the contact charge of the charge roller, lowering the potential on the image drum surface. The resultant drop in the potential of the irradiated portion of the image drum surface forms an electrostatic latent image on it. The irradiated portion of the image drum surface is kept to about -100 V.
(4) Developing Toner is attracted to the electrostatic latent image on the image drum surface, converting it into a visible toner image. Developing takes place through the contact between the image drum and the developing roller.
1 As the toner supply roller rotates while rubbing on the developing roller, a friction charge is generated between the developing roller and the toner, allowing the toner to be attracted to the developing roller (the developing roller surface is charged positive and the toner, negative).
2 The toner attracted to the developing roller is scraped off by the doctor blade, forming a thin coat of toner on the developing roller surface. 3 Toner is attracted to the exposed portion (low-potential part) of the image drum at the contact of the image drum and the developing roller, making the electrostatic latent image visible.
An illustration of activities at the contact point of the image drum surface and the developing roller (arrow marks denote the direction of the electrical field).
Note: The bias voltage required during the developing process is supplied to the toner supply roller and the developing
roller, as shown below. -500 VDC is supplied to the toner supply roller, -265 VDC to the developing roller.
(5) Transfer The transfer roller is composed of conductive sponge material, and is designed to get the image drum surface and the paper in a close contact. Paper is placed over the image drum surface, and the positive charge, opposite in polarity to that of the toner, is applied to the paper from the reverse side. The application of a high positive voltage from the power supply to the transfer roller causes the positive charge inducement on the transfer roller surface, transferring the charge to the paper as it contacts the transfer roller. The toner with negative charge is attracted to the image drum surface, and it is transferred to the upper side of the paper due to the positive charge on the reverse side of the paper.
(6) Fusing
When the transfer is completed, the toner image is fused to the paper by heat and pressure as the paper with unfused toner image passes between the heater roller and the back-up roller. The heater roller with Teflon coating incorporates a 400W heater (Halogen lamp), which generates heat. A thermistor which is in contact with the heater roller regulates the temperature of the heater roller to a designated temperature in the menu, depending on the thickness of the paper (tray 1&2: light=165°C, medium light=170°C, medium=175°C, medium heavy and heavy=195°C/manual feeding and power envelope feeder: light=175°C, medium light=180°C, medium=185°C, medium heavy=190°C, heavy=195°C, transparency = 160°C). A safety thermostat cuts voltage supply to the heater off by opening the thermostat in the event of abnormal temperature rises. The back-up roller is held under a pressure of 3.76 kg applied by the pressure spring on each side.
(7) Cleaning When the transfer is completed, the residual toner left on the image drum is attracted to the cleaning roller temporarily by static electricity, and the image drum surface is cleaned.
(8) Cleaning of rollers The charge, transfer and cleaning rollers are cleaned for the following cases:
l l l
Warming up when the power is turned on. Warming up after the opening and closing of the cover. When the number of sheets accumulated reaches 10 or more, and the printout operation ends.
Changes in bias voltage applied to each roller move the attaching toner off the roller to the image drum and return it to the developer.
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Service Guide OKIPAGE 12i
Chapter 2 Operation Description
2.3.4 Revision of LED Head Illumination
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. The LED correcting head consists of the correction control LSI (MSM6730WAF), LED drivers (MSM6731BWAF or MSM6732BWAF), and an LED array. The block diagram of the LED correcting head is shown below.
The existing LED head receives the printing data from the CPU directly at its LED drivers. With the LED correcting head, a correction control LSI (MSM6730WAF) is connected between the CPU and LED drivers, so the printing data is input to the LED drivers through the correction control LSI. In order to maintain compatibility with the existing LED head, the printing operation of the LED correcting head is carried out through identical sequence. The LED correcting head is a 600 dpi head, with the LED drivers located on both sides of the LED array with a 300 dpi pitch spacing. The printing and correction data obtained from the CPU through four signal lines are sent to the LED array. The printing operation timing chart is shown below.
The printing operation is carried out in normal mode. Under ordinary circumstances such as when the power is turned on or when LOADI signal level is low, the normal mode is enabled. The printing operation is carried out in the following sequence. First, the printing data DATA13 through DATA10 are stored, sequentially shifted, in the shift registers of the LED drivers, by the printing data synchronous clock, CLOCK. Then the printing data stored in shift registers are latched by the high level pulse of LOAD. The latched printing data turns the LEDs on by STRB11-N through STRB41-N and actuates printing. The mode setting timing chart during illumination correction is shown below.
The mode setting is carried out in the following manner. LOAD is fixed at high level, and DATA10 which comes up following this is 4-data latched with the timing of the fall of CLOCK. The illumination correction mode is selected based on the latched 4-data combination. Then the mode becomes valid at the fifth fall of CLOCKI. The period during which the illumination correction mode is valid is from the fall of the fifth CLOCK and while the level of LOAD is high. When the level of LOAD becomes low, the illumination correction mode is terminated, and the head returns to the normal mode, which is mode with which the printing is normally carried out. The LED driver (MSM6731BWAF) corrects the LED illumination by controlling the LED current. The LED illumination can be set in 16 steps, with 7 steps in the direction of illumination increase in relation to the standard value, and 8 steps in the direction of decrease. For this reason, the LED correction data is a 4-bit data for each dot. The relationship between the LED correction data and LED current correction steps with the LED driver (MSM6731BWAF) used in an LED head is shown below.
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Service Guide OKIPAGE 12i
Chapter 2 Operation Description
2.4 Paper Jam Detection
The paper jam detection function monitors the paper condition when the power is turned on and during printing. When any of the following conditions arises, this function interrupts the printing process. If any of the following errors is encountered, printing can be recovered by removing the jammed paper (by opening the upper cover, removing the jammed paper and closing the upper cover).
Error Cause of error
l l l l l
Paper input jam
Paper feed jam
Paper exit jam
l l l l l l l
Paper size error
The paper is in contact with the inlet sensor when the power is turned on. After hopping operation is attempted three times, the leading edge of the paper does not reach the inlet sensor. The paper is in contact with the paper sensor when the power is on. The leading edge of the paper does not reach the paper sensor within a predetermined feeding distance since the paper has reached the inlet sensor. The leading edge of paper does not reach the outlet sensor within a predetermined feeding distance after the paper has reached the paper sensor. The paper is in contact with the outlet sensor when the power is turned on. The paper does not pass over the outlet sensor within a predetermined feeding distance after the leading edge of the paper has reached the outlet sensor. The paper size check for manual feeding finds that the paper size is free size. The size of the paper is monitored by the inlet sensor 1. The paper is not detected by the inlet sensor 1 within predetermined feeding distance. The inlet sensor 2 detects that the size of the loaded paper is A4 or larger, or smaller than A4. The detected paper size differs from the paper size set by command or menu. The paper size check for manual feeding finds that the paper size is free size.
Paper Feed Timing Chart
Paper Feed Check List Type of error Monitor
Standard Value
Error Plus
Error Minus
Paper feed error Paper feed jam Paper feed jam Paper size error Paper exit jam Paper feed jam
Hopping start to In Sensor on In sensor on to Write sensor on Write sensor on to Out sensor on In sensor on to Out sensor on Out sensor on to Out sensor off In sensor off to Write sensor off
72.0 20.0 140.5 Depends on the paper length Depends on the paper length 22.2
36.0 22.0 25.0 45.0 45.0 22.0
45.0 45.0 -
Note: Hyphen "-" in the table represents "not checked". Paper Length List Type Paper length
Check range Min.
Check range Max.
A4 A5 B5 LETTER LEGAL 13 LEGAL 14 EXEC A6 Monarch COM-10 DL C5 Free
297.0 210.0 257.0 279.4 330.2 355.6 266.7 148.0 190.5 241.3 220.0 229.0 110.1-355.6
252.0 165.0 212.0 234.4 285.2 310.6 221.7 103.0 145.5 196.3 175.0 184.0 65.0
342.0 255.0 302.0 324.4 375.2 400.6 311.7 193.0 235.5 286.3 265.0 274.0 400.6
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Service Guide OKIPAGE 12i
Chapter 2 Operation Description
2.5 Cover Open
When the stacker cover is opened, the cover open microswitch on the power supply/sensor board is turned off to cut +5V supply to the high voltage power supply circuit. This results in the interruption of all high-voltage outputs. At the same time, the CVOPN signal is sent to the main control board to notify that the microswitch is off, and the main control board carries out the cover open process.
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Service Guide OKIPAGE 12i
Chapter 2 Operation Description
2.6 Toner Low Detection
l
Device
The Toner Low Detection device consists of a stirring gear which rotates at a constant rate, a stirring bar and a magnet on the stirring bar. The stirring bar rotation is driven by the link to the protrusion in the stirring gear.
l
Operation
Toner Low is detected by monitoring the time interval of the encounter of the magnet set on the sensor lever and the magnet on the stirring bar.
Operation during Toner Full state
l
The stirring bar is rotated due to the mechanical transmission of energy originating from the interlocking with the stirring gear. Even when the magnet on the stirring bar reaches the maximum height, the stirring bar is pushed by the stirring gear, since the other end is being dipped in the toner.
l
Operation during Toner Low state
l
When the stirring bar reaches the maximum height, it falls to the minimum height due to its own weight, since there is no resistance provided by the toner on the other side. Because of this, the time interval during which it is in encounter with the magnet of the sensor lever becomes longer. By monitoring this time interval, Toner Low can be detected.
TONER FULL state
TONER LOW state
l l l
When the Toner Low state is detected 2 times consecutively, Toner Low is established. When the Toner Full state is detected 2 times consecutively, Toner Low is canceled. When there is no change with the toner sensor for 2 cycles (4.875 sec. x 2) or more, then the Toner Sensor Alarm is activated. The toner sensor is not monitored while the drum motor is in halt.
l
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Service Guide OKIPAGE 12i
Chapter 3 Parts Replacement
3.1 Precautions for Parts Replacement
The section explains the procedures for replacement of parts, assemblies, and units in the field. Only the disassembly procedures are explained here. For reassembly, reverse the steps of disassembly procedure. (1) Before starting the parts replacement, remove the AC power cord and interface cable. (a) Remove the AC power cord in the following sequence: i) Turn off ("o") the power switch of the printer. ii) Disconnect the AC inlet plug of the AC power cord from the AC receptacle. iii) Disconnect the AC power cord and interface cable from the printer. (b) Reconnect the printer in the following sequence. i) Connect the AC power cord and interface cable to the printer. ii) Connect the AC inlet plug to the AC receptacle. iii) Turn on ("l") the power switch of the printer.
(2) Do not try to disassemble as long as the printer is operating normally. (3) Do not remove parts which do not need to be touched; try to keep the disassembly to a minimum. (4) Use specified service tools. (5) When disassembling, follow the procedure in sequence laid out in this manual. Parts may be damaged if these sequences are not followed. (6) Since screws, collars and other small parts are likely to be lost, they should temporarily be attached to the original positions during disassembly. (7) When handling IC's such as microprocessors, ROM's and RAM's, or circuit boards, do not wear gloves that are likely to generate static electricity. (8) Do not place printed circuit boards directly on the equipment or floor.
[Service Tools]
The tools required for field replacement of printed circuit boards and units are listed in Table 3-1. Table 3-1 Service Tools
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Service Guide OKIPAGE 12i
Chapter 3 Parts Replacement
3.2 Parts Layout - [Lower base unit]
This section describes the layout of main parts of the equipment.
[Lower base unit]
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Service Guide OKIPAGE 12i
Chapter 3 Parts Replacement
[Upper cover unit]
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Service Guide OKIPAGE 12i
Chapter 3 Parts Replacement
[Base unit]
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Service Guide OKIPAGE 12i
Chapter 3 Parts Replacement
3.3 How to Change Parts
This section explains how to change parts and assemblies listed in the disassembly diagram below.
3.3.1 Upper cover 3.3.2 LED head 3.3.3 Operator Panel Assy 3.3.4 Lower Base Unit 3.3.5 Pulse Motor (Main/Drum) 3.3.6 Pulse Motor (Registration) 3.3.7 Face Up Stacker Assy 3.3.8 Eject Roller Assy 3.3.9 Motor Assy 3.3.10 Hopping Roller Shaft Assy 3.3.11 Stacker Cover Assy 3.3.12 Registration Roller 3.3.13 Roller Transfer Assy 3.3.14 Fusing Unit 3.3.15 Back-up Roller 3.3.16 Sensor Plate (Inlet) 3.3.17 Sensor Plate (Outlet) 3.3.18 Manual Feed Guide Assy 3.3.19 Sensor Plate (Paper Supply) 3.3.20 Main Control Board M5E-PCB 3.3.21 Transformer 3.3.22 Power supply/Sensor Board and Contact Assy 3.3.23 Cassette Guide L Assy 3.3.24 Cassette Guide R Assy 3.3.25 Spacer Bearing (L/R)
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Service Guide OKIPAGE 12i
Chapter 3 Parts Replacement
3.3.1 Upper Cover Assy
(1) With the power switch turned off, unplug the AC power cord from the outlet. (2) Disconnect the interface cable (1). (3) Press the knobs (2) on left and right sides and open the stacker cover assy (3). (4) Take out the image drum unit (4). (5) Remove two screws (5), and open the manual feed guide assy (6). Lift the front side of the upper cover (7) up and unlock the latches at two locations on the back side. Lift and remove the upper cover assy (7).
Notes:
1. When removing or reinstalling the upper cover, be careful not to get the motor cables tangled or caught. 2. When reinstalling the screws (5), be sure to direct the screws into preexisting threads.
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Service Guide OKIPAGE 12i
Chapter 3 Parts Replacement
3.3.2 LED Head
(1) Press the knobs on left and right sides and open the stacker cover assy (1). (2) Open the hook section on the left side of the stacker cover and remove the LED head (2).
Note:
l l l l
Be sure not to touch directly or push on the SLA part of the LED head. Do not remove the LED cable (3) from the connector. Remove connector (4) and cable (3) together as an assembly from the LED head. After mounting the new LED head and reinstalling the cable, set drive time of the LED head according to the marking on the LED head (see 4.2.1).
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Service Guide OKIPAGE 12i
Chapter 3 Parts Replacement
3.3.3 Operator Panel Assy
(1) Unlock two latches on the upper cover from the rear side, lift the operator panel assy (1) from the back and remove it. (2) Remove the Sumi card (operator panel) (2) from the connector (CN1) (3).
Note: You can remove the operator panel assy while the upper cover installed on the unit. However, it is much easier to
remove the panel assy after removal of upper cover.
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Service Guide OKIPAGE 12i
Chapter 3 Parts Replacement
3.3.4 Lower Base Unit
(1) Remove the upper cover (see 3.3.1). (2) Remove the operator panel assy (see 3.3.3). (3) Remove the face up stacker assy (see 3.3.7) (4) Remove the connecting cables (2) and (3) of the pulse motors from the connectors (DM, RM) of the M5E-PCB (1). (5) Remove the LED head cables (4) and (5) from the connectors (HEAD1, HEAD2). (6) Open the manual feed guide assy, remove six screws (7), then remove the lower base unit (6).
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Service Guide OKIPAGE 12i
Chapter 3 Parts Replacement
3.3.5 Pulse Motor Main/Drum
(1) Remove the upper cover (see 3.3.1). (2) Remove the lower base unit (see 3.3.4). (3) Remove two screws (1) and remove the pulse motor (main drum) (2) from the motor bracket (3).
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Service Guide OKIPAGE 12i
Chapter 3 Parts Replacement
3.3.6 Pulse Motor (Registration)
(1) Remove the upper cover (see 3.3.1). (2) Remove the lower base unit (see 3.3.4). (3) Remove two screws (1) and remove the pulse motor (registration) (2) from the motor bracket (3).
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Service Guide OKIPAGE 12i
Chapter 3 Parts Replacement
3.3.7 Face Up Stacker Assy
(1) Remove the upper cover (see 3.3.1). (2) Remove the operator panel assy (see 3.3.3). (3) Remove the screw (1) and remove the Sumi card (operator panel cable) (2) off the latch section of face up stacker (4). Remove both the shield plate (3) and face up stacker (4) together. (4) Unlock the latches at two locations, and remove the face up stacker (4).
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Service Guide OKIPAGE 12i
Chapter 3 Parts Replacement
3.3.8 Eject Roller Assy
(1) Remove the upper cover assy (see 3.3.1). (2) Remove the operator panel assy (see 3.3.3). (3) Remove the face up stacker assy (see 3.3.7). (4) Remove the lower base unit (see 3.3.4). (5) Disengage the eject roller assy (1) from the lower base (2) by pressing the latch section of the eject roller assy (1) in the direction of the arrow shown below, and remove the eject roller assy (1).
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Service Guide OKIPAGE 12i
Chapter 3 Parts Replacement
3.3.9 Motor Assy
(1) Remove the upper cover assy (see 3.3.1). (2) Remove the operator panel assy (see 3.3.3). (3) Remove the face up stacker assy (see 3.3.7). (4) Remove the lower base unit (see 3.3.4). (5) Stand the lower base unit on its side as shown, and unlock two latches, then remove the motor assy (1).
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Service Guide OKIPAGE 12i
Chapter 3 Parts Replacement
3.3.10 Hopping Roller Shaft Assy
(1) Remove the upper cover assy (see 3.3.1). (2) Remove the operator panel assy (see 3.3.3). (3) Remove the face up stacker assy (see 3.3.7). (4) Remove the lower base unit (see 3.3.4). (5) Remove the motor assy (see 3.3.9). (6) With the lower base unit (1) standing on its side, remove the one-way clutch gear (2) and the bearing (A) (3). (7) Remove the hopping roller shaft assy (4) (the bearing (B) (5) comes off, so be careful not to lose it).
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Service Guide OKIPAGE 12i
Chapter 3 Parts Replacement
3.3.11 Stacker Cover Assy
(1) Remove the upper cover assy (see 3.3.1). (2) Remove the operator panel assy (see 3.3.3). (3) Remove the face up stacker assy (see 3.3.7). (4) Remove the reset lever R (1). (5) Detach the reset spring (2) from the lower base unit (3), turn the reset lever L (4) in the direction of arrow (A) until it stops, and remove it in the direction of arrow (B). (6) Unlock two latches of the lower base unit (3), then remove the stacker cover assy (5).
Note: When reinstalling the reset level L (4), fit it onto the guide of the lower base unit (3), turn it in the direction of arrow
(C) while pressing down the shaft of back up roller, and engage the reset lever L (4).
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Service Guide OKIPAGE 12i
Chapter 3 Parts Replacement
3.3.12 Registration Roller
(1) Remove the upper cover (see 3.3.1). (2) Remove the operator panel assy (see 3.3.3). (3) Remove the face up stacker assy (see 3.3.7). (4) Remove the lower base unit (see 3.3.4). (5) Remove the motor assy (see 3.3.9). (6) With the lower base unit standing on its side, remove the one-way clutch gear (1). (7) Press the registration roller (2) in the direction of arrow (A) and lift up the left side of it, then remove the registration roller (2) and the bearing (registration) (3). (8) Pull out the registration roller (2) in the direction of arrow (B).
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Service Guide OKIPAGE 12i
Chapter 3 Parts Replacement
3.3.13 Roller Transfer Assy
(1) With the power switch turned off, unplug the AC cord from the outlet. (2) Open the stacker cover. (3) Release the roller transfer assy (1) by unlocking the latch of the main unit (never apply excessive force when unlocking the latch). (4) Lift the right side of the roller transfer assy (1), and shift it to the right side, then pull it out from the main unit (at this time, the bearings (2) of the left and right sides of the roller transfer assy (1) will also come off).
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Service Guide OKIPAGE 12i
Chapter 3 Parts Replacement
3.3.14 Fusing Unit
(1) Remove the upper cover assy (see 3.3.1). (2) Remove the operator panel assy (see 3.3.3). (3) Remove the face up stacker assy (see 3.3.7). (4) Remove the lower base unit (see 3.3.11). (5) Remove the four screws (1), lift and remove the fusing unit (2).
Caution: Fusing unit may be hot. Use care when handling. Notes:
1. When reinstalling or removing the fusing unit, tighten or loosen the screws while holding the fusing unit assy (2) down with your hand (it is being pushed up by back up roller). 2. When reinstalling the screws (1), be sure to direct the screws into preexisting thread and avoid damaging the threads. 3. Do not apply excessive torque when tightening the screws (1).
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Service Guide OKIPAGE 12i
Chapter 3 Parts Replacement
3.3.15 Back-up Roller
(1) Remove the fusing unit assy (see 3.3.14). (2) Lift the left side of the back-up roller (1), and pull it out to the left side (at this time, two bushings (back-up) (2) and the bias springs (back-up) (3) will also come off).
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Service Guide OKIPAGE 12i
Chapter 3 Parts Replacement
3.3.16 Sensor Plate (Inlet)
(1) Remove the upper cover (see 3.3.1). (2) Remove the operator panel assy (see 3.3.3). (3) Remove the face up stacker assy (see 3.3.7). (4) Remove the lower base unit (see 3.3.4). (5) Press the clamps of three sensor plates (inlet and paper) (1), and remove them by pressing them upward from the bottom.
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Service Guide OKIPAGE 12i
Chapter 3 Parts Replacement
3.3.17 Sensor Plate (Outlet)
(1) Remove the upper cover (see 3.3.1). (2) Remove the operator panel assy (see 3.3.3). (3) Remove the eject roller assy (see 3.3.8). (4) Remove the face up stacker assy (see 3.3.7). (5) Remove the lower base unit (see 3.3.4). (6) Remove the fusing unit assy (see 3.3.14). (7) Press the clamps of the sensor plate (outlet) (1), and remove the sensor plate by pushing it up.
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Service Guide OKIPAGE 12i
Chapter 3 Parts Replacement
3.3.18 Manual Feed Guide Assy
(1) Remove the upper cover (see 3.3.1). (2) Open the manual feed guide assy (1), and release the engagement on both sides with the main unit by carefully bending the manual feed guide assy (1).
Note: At the time of mounting, verify the proper the engagements as shown in the diagram.
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Service Guide OKIPAGE 12i
Chapter 3 Parts Replacement
3.3.19 Sensor Plate (Paper Supply)
(1) Remove the upper cover (see 3.3.1). (2) Remove the operator panel assy (see 3.3.3). (3) Remove the face up stacker assy (see 3.3.7). (4) Remove the lower base unit (see 3.3.4). (5) Press the clamps of the sensor plate (paper supply) (1) to unlock the latch, and remove it from the base plate (2).
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Service Guide OKIPAGE 12i
Chapter 3 Parts Replacement
3.3.20 Main Control Board M5E-PCB
(1) Remove the upper cover (see 3.3.1). (2) Remove the operator panel assy (see 3.3.3). (3) Remove the face up stacker assy (see 3.3.7). (4) Remove the lower base unit (see 3.3.4). (5) Remove the connector (2NDTRAY) (6). (6) Remove the screws (1). (7) Move the M5E-PCB Main Control Board (2) in the direction of arrow to disconnect it from the power supply/sensor board (3). (8) Remove the connector FAN, and disconnect the fan motor (4). (9) Remove the M5E-PCB Main Control Board (2), together with the PCB guide plate (remove the fan motor (4) at the same time). (10) Remove three screws (8) and remove the PCB guide plate (7) from the M5E-PCB Main Control Board (2).
Note: When reinstalling the M5E-PCB (2) onto the guide plate (7), be careful not to bend the base plate (it is desirable to
place a block underneath it to prevent bending).
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Service Guide OKIPAGE 12i
Chapter 3 Parts Replacement
3.3.21 Transformer
(1) Remove the upper cover (see 3.3.1). (2) Remove the operator panel assy (see 3.3.3). (3) Remove the face up stacker assy (see 3.3.7). (4) Remove the connectors (CN1 and CN2). (5) Remove two screws (1), and remove the transformer (2).
Note: When reinstalling the transformer, be sure to lay the AC and transformer's primary side cables under the divider
(see view A diagram below).
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Service Guide OKIPAGE 12i
Chapter 3 Parts Replacement
3.3.22 Power Supply/Sensor Board and Contact Assy
(1) Remove the upper cover (see 3.3.1). (2) Remove the lower base unit (see 3.3.4). (3) Remove the M5E-PCB Main Control Board (see 3.3.20). (4) Remove the transformer (see 3.3.21). (5) Remove the AC inlet (1) from the base plate (2). (6) Remove the screw (3) and remove the grounding (earth) wire (4). (7) Remove three screws (5), and remove the power supply/sensor board (6) and contact assy (7) together. (8) Unlock two latches (8), and remove contact assy (7) from the power supply/sensor board.
Notes:
1. Be careful about the sensor (paper supply) when reinstalling the lower base. 2. Make sure that no excessive force is applied to the power supply switch. 3. When installing the power supply/sensor onto the base plate, be careful not to bend the base plate (it is desirable to place a block underneath it to prevent bending).
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Service Guide OKIPAGE 12i
Chapter 3 Parts Replacement
3.3.23 Cassette Guide L Assy
(1) Remove the paper cassette. (2) Remove the upper cover (see 3.3.1). (3) Remove the lower base unit (see 3.3.4). (4) Remove the Main Control M5E-PCB (see 3.3.20). (5) Remove the transformer (see 3.33.21). (6) Remove the power supply/sensor board (see 3.3.22). (7) Remove two screws (1), and remove the guide rails (2). (8) Remove the screw (3), and remove the cassette guide L (9) by shifting it in the direction of the arrow as shown below. (9) Remove cassette lock lever (4) and torsion spring (5). (10) Remove cassette lock lever spring (8) then remove the sheet link (L) (6) and Pull block (7).
Copyright 1998, 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 OKIPAGE 12i
Chapter 3 Parts Replacement
3.3.24 Cassette Guide R Assy
(1) Remove the paper cassette. (2) Remove the upper cover (see 3.3.1). (3) Remove the lower base unit (see 3.3.4). (4) Remove the Main Control M5E-PCB (see 3.3.20). (5) Remove the two screws (1), and remove the guide rails (2). (6) Remove the screw (3), and remove the cassette guide R (4) by shifting it in the direction of arrow. (7) Remove the cassette lock lever (5) and torsion spring (6). (8) Remove the cassette lock lever spring (9), then remove the sheet ink (R) (7) and link pull block (8). (9) Remove two screws (10), and remove the square-shaped connector (11).
Copyright 1998, 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 OKIPAGE 12i
Chapter 3 Parts Replacement
3.3.25 Spacer Bearing (L/R)
(1) Remove the back-up roller (see 3.3.15). (2) Remove spacer bearing (L/R) with a tip of screw driver.
Copyright 1998, 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 OKIPAGE 12i
Chapter 4 Adjustment
4. Adjustment
This chapter provides explanations concerning the adjustment necessary when replacing a part. The adjustment is made by changing the parameter value set in EEPROM on the main control board. The parameter can be set by the key operation from the operator panel. This printer has three kinds of maintenance modes, and it is necessary to select one of the modes when replacing any parts.
Copyright 1998, 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 OKIPAGE 12i
Chapter 4 Adjustment
4.1 Maintenance Modes and Functions 4.1.1 User Maintenance Mode 4.1.2 System Maintenance Mode 4.1.3 Engine Maintenance Mode 4.1.4 EEPROM Initialization
Copyright 1998, 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 OKIPAGE 12i
Chapter 4 Adjustment
4.1.1 User Maintenance Mode
To enter into the user maintenance mode, turn the POWER switch on while holding the MENU key down. Function There are five functions as follows:
l l l l l l l l l l l
Menu reset Opepane menu disable Hex dump X-adjust Drum counter reset Y-adjust Resource Save Receive buffer 2nd Tray Setting Place page
Detailed descriptions of these functions are provided in Appendix D, DIAGNOSTICS TEST.
Copyright 1998, 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 OKIPAGE 12i
Chapter 4 Adjustment
4.1.2 System Maintenance Mode
This mode is used only by maintenance personnel and it should not be released to the end-users. To enter into the system maintenance mode, turn the POWER switch on while holding the Recover key down.
Function
There are six functions as follows:
l l l l l l
Page count display Loop test Page count printing enable/disable EEPROM reset Rolling ASCII continues printing SIDM enable/ disable
Detailed descriptions of these functions are provided in Appendix D, DIAGNOSTICS TEST.
Copyright 1998, 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 OKIPAGE 12i
Chapter 4 Adjustment
4.1.3 Engine Maintenance Mode Note: This mode is used only by maintenance personnel, and it should not be released to the end users.
(1) To enter into the engine maintenance mode, turn the power on while holding ENTER and FORM FEED keys down. (2) Functions of this mode are selected by the menu. (3) The way to exit out of this mode varies depending on the settings. (4) There are following engine maintenance modes: a) Head drive time setting - Sets the drive time of the LED head. b) Adjusting head type c) 600 x 1200 DPI strobe time relative value. d) Installed LED head identification. e) Printing start position setting - Sets the starting position of printing. f) Drum count total display - The total image drum rotation count of the printer, as counted by the engine section, is displayed on the LCD. g) Drum count display - The total image drum rotation count, as counted by the engine section, is displayed on the LCD. h) Standard tray paper feeding quantity setting - Sets the amount of paper to be fed from the standard tray. i) High Capacity Second Paper Feeder paper feeding quantity setting - Sets the amount of paper to be fed from High Capacity Second Paper Feeder. j) High Capacity Second Paper Feeder downloading table selection - Selects the downloading table of High Ca