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Service Guide OKIPAGE 24DX/24DXn
Chapter 0 Introduction
Front Cover
Oki Data Service Guide
OKIPAGE 24DX & 24DXn
Adobe Acrobat printable reference copy of the OKIDATA Service Training Manual. 01/26/2000
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 24DX/24DXn
0 Introduction Preface 1 Configuration 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 2 Operation Description 2.0 Operation Description 2.1 Main Control Board (BOARD-FFF) 2.2 Power Supply Unit 2.3 Electro-photographic Process ....2.3.1 Electro-photographic process mechanism ....2.3.2 Electro-Photographic 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 2.7 Stacker-full Detection 2.8 Page Size Detection 3 Parts Replacement Parts Replacements ....3.1 Precautions for Parts Replacement ....3.2 Parts Layout ........Figure 3-1 ........Figure 3-2 ........Figure 3-3 ........Figure 3-4 ....3.3 How to Change Parts ........3.3.1 Face-up Stacker Assy ........3.3.2 Contact Assy ........3.3.3 DC Fan Motor ........3.3.4 OP Panel Assy ........3.3.5 Board - FFF ........3.3.6 Stacker Assy, Damper Arm, Cover Rear ........3.3.7 Sensor Stacker Full ........3.3.8 Cable cover (guide film) ........3.3.9 Damper ........3.3.10 Feeder Unit - Front ........3.3.11 Roller Assy - Regist ........3.3.12 Motor - Main ........3.3.13 Guide Assy - Eject ........3.3.14 Heat Assy ........3.3.15 Roller feed (C) ........3.3.16 Roller Assy - BK
1 2 3 4 5 6 7 8 9 10 11 12 13 15 16 18 17 19 14 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42
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........3.3.17 Roller Assy - Feed ........3.3.18 LED Head ........3.3.19 Paper cassette, ROLLER Assy - Feed, ROLLER Assy - Hopping ........3.3.20 Frame Assy - Separation ........3.3.21 Transfer Roller / TR Gear / TR Bearing ........3.3.22 EP lock shaft ........3.3.23 LEVER Assy - Out Sensor ........3.3.24 Toner sensor lever ........3.3.25 Paper sensor lever ........3.3.26 Inlet sensor lever ........3.3.27 Power supply unit ........3.3.28 Lever-Paper end & Lever-Paper near end ........3.3.29 Guide Assy - Cassette (L) ........3.3.30 Guide Assy - Cassette (R) ........3.3.31 Removing/Installing Duplex Unit ........3.3.32 Board-LEX ........3.3.33 Connector (IMSA-9714N-14A) ........3.3.34 Photo Sensor ........3.3.35 SOLENOID Assy ........3.3.36 Motor 4 Adjustment 4.0 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 LED Head Drive Time ........4.2.2 Destination setting ........4.2.3 Setting of LED head drive time 5 Periodic Maintenance 5.1 Periodic Maintenance 5.2 Cleaning ....5.2.1 Cleaning the LED Lens Array ....5.2.2 Cleaning the Plastic Film 6 Troubleshooting Procedures 6.1 Troubleshooting Tips 6.2 Check Points Before Correcting Image Problems 6.3 Notes When Correcting Image Problems 6.4 Preparation Before Troubleshooting 6.5 Troubleshooting Flowchart ....6.5.1 Status Monitor Message List ....6.5.2 LCD message troubleshooting ........(1) The printer does not work normally after being turned on. ........(2) Paper jams ............(2)-1 Paper input jam (1st tray) ............(2)-2 Paper input jam (front feeder)
43
44 45 46 47 47 47 48 49 50 50 51 52 53 53 54 55 56 57 58 59 61 62 63 63 63
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............(2)-3 Paper feed jam ............(2)-4 Paper exit jam ............(2)-5 Duplex INPUT JAM ............(2)-6 Duplex FEED JAM1 ............(2)-7 Duplex FEED JAM2 ............(2)-8 Duplex FEED JAM3 ........(3) Paper size error ........(4) Fuser unit error (ERROR 71), (ERROR 72), (ERROR 73) ........(5) I/F time-out between printer and optional tray (ERROR 81) ........(6) I/F time-out between printer and Duplex Unit (ERROR 83) ........(7) I/F time-out occurs between the printer and the operator panel (ERROR 80) ........(8) Message cannot be received through the parallel interface ........(9) Message cannot be received through the serial interface ........(10) Data cannot be received through the OKI HSP interface ........(11) Synchronous serial I/O error (ERROR 74) ....6.5.3 Image Troubleshooting ........(1) An image is light or blurred entirely ........(2) Dark background density ........(3) Black paper is output ........(4) Black belts or stripes in the vertical direction ........(5) Cyclic error ........(6) Print voids ........(7) Poor fusing ........(8) White belts or streaks in the vertical direction ........(9) Snowy print of high density pattern ........(10) Blotchy faded print ........Contents - Figure 6-5 ........Contents - Figure 6-6 7 Wiring Diagram 7.1 Interconnect Signal Diagram 7.2 PCB Layout ....7.2.1 Main Control Board (HBY PCB) ....7.2.2 Power Supply Board (120V/230V) ....7.2.3 Power supply board (High voltage) ....7.2.4 LEX-PCB ....7.2.5 Flash ROM module (BOARD-FSL or BOARD-FSL-2) 7.3 Resistance Check 7.4 Program Font/ROM Location 8 Parts List Figure 8-1 Printer Unit Figure 8-2 Frame - Main Unit Figure 8-3 Base Unit Figure 8-4 Duplex Unit A Centronics Parallel Interface
63 63 63 63 63 63 64 65 66 67 68 69 69 69 69 61 62 63 64 65 66 67 68 69 69 69 70 71 72 73 74 75
76 77 77 77
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Parallel Interface B RS-232C Serial Interface RS-232C Serial Interface C Duplex Unit Maintenance 1. OUTLINE ....1.1 Functions ....1.2 External View and Component Names 2.0 Mechanism Description ....2.1 General Mechanism ....2.2 JAM Release Mechanism ....2.3 Removing/Installing Duplex Unit 3.0 Parts Replacement ....3.1 Precautions Concerning Parts Replacement ....3.2 Parts Layout ....3.3 Parts Replacement Methods ........3.3.1 Board-LEX ........3.3.2 Connector (IMSA-9714N-14A) ........3.3.3 Photo Sensor ........3.3.4 SOLENOID Assy ........3.3.5 Motor 4.0 Troubleshooting ....4.1 Precautions Prior to the Troubleshooting ....4.2 Preparations for the Troubleshooting ....4.3 Troubleshooting Method ........4.3.1 LCD Status Message List ........4.3.2 Troubleshooting Flow 5.0 Connection Diagram ....5.1 Interconnection Diagram ....5.2 PCB Layout 6.0 Parts List Table 6-1 Duplex Unit D Second / Third Paper Feeder Maint (option) 1.0 Outline ....1.1 Functions ....1.2 Appearance and Parts Name 2.0 Description of operation ....2.1 Driving Mechanism ....2.2 Hopper Mechanism 3.0 Parts Replacement ....3.1 Precautions Concerning Parts Replacement ....3.2 Parts Layout ....3.3 Parts Replacement Methods ........3.3.1 Roller assy hopping, Roller assy feed ........3.3.2 Cover front assy ........3.3.3 Board-BBB ........3.3.4 Lever paper end, Lever paper near end ........3.3.5 Motor ........3.3.6 Connector (IMSA-9714N-14B), Connector (IMSA-9714N-14A) ........3.3.7 Frange pulley, pulley Idle, Mini pitch belt, Plate Earth shaft, Gear double, Tray switch assy
81 81 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137
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........3.3.8 Roller feed ........3.3.9 Bracket sub roller ........3.3.10 Frame side (L) assy ........3.3.11 Frame side (R) assy 4.0 Troubleshooting ....4.1 Precautions Prior to the Troubleshooting ....4.2 Preparations for the Troubleshooting ....4.3 Troubleshooting Method ........4.3.1 LCD Status Message List ........4.3.2 Troubleshooting Flow 5.0 Connection Diagram ....5.1 Interconnection Diagram ....5.2 PCB Layout 6.0 Parts List E Multi Feeder Maint. (option) 1.0 Outline ....1.1 Functions ....1.2 External View and Component Names 2.0 Mechanism Description ....2.1 General Mechanism ....2.2 Hopper Mechanism 3.0 Parts Replacement ....3.1 Precautions Concerning Parts Replacement ....3.2 Parts Layout ....3.3 Parts Replacement Methods ........3.3.1 Separator ........3.3.2 AOLE-PCB ........3.3.3 Square-shaped connector ........3.3.4 Hopping Motor ........3.3.5 Planet gear ........3.3.6 Roller B ........3.3.7 Roller A ........3.3.8 Mini pitch belt & Feed roller 4.0 Troubleshooting ....4.1 Precautions Prior to the Troubleshooting ....4.2 Preparations for the Troubleshooting ....4.3 Troubleshooting Method ........4.3.1 LCD Status Message List ........4.3.2 Troubleshooting Flow 5.0 Connection Diagram ....5.1 Interconnection Diagram ....5.2 PCB Layout 6.0 Parts List
138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 177 179
Page: 1
Service Guide OKIPAGE 24DX/24DXn
Chapter 0 Introduction
Preface
This maintenance manual describes the field maintenance methods for OKIPAGE 24DX & 24DXn. This manual is written for use by maintenance personnel. Note, however, that the user should refer to the USER'S MANUAL for methods of handling and operating 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)
Page: 2
Service Guide OKIPAGE 24DX/24DXn
Chapter 1 Configuration
Configuration System Configuration Printer Configuration Optional Configuration Specification Safety Standards
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)
Page: 3
Service Guide OKIPAGE 24DX/24DXn
Chapter 1 Configuration
1.1 System Configuration
The OKIPAGE 24DX & 24DXn consists of control and engine blocks as the standard configuration (See Figure 1-1). In addition, the following options are also available.
Figure 1-1
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)
Page: 4
Service Guide OKIPAGE 24DX/24DXn
Chapter 1 Configuration
1.2 Printer Configuration
The printer unit consists of the following hardware components:
l l l l l
Electro-Photographic Processor Paper Feeder Controller Operator panel Power supply unit
Figure 1-2 is the configuration of the printer unit.
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)
Page: 5
Service Guide OKIPAGE 24DX/24DXn
Chapter 1 Configuration
1.3 Optional Configuration
The options below are available for use with OKIPAGE 24DX / OKIPAGE 24DXn. They are sold separately from the printer unit. 1 Multi Feeder
2
Second / Third Paper Feeder
4
D-RAM SIMM module (72 pin SIMM, 16 MB/32MB, EDO SIMM type)
(See 7.2 (1) for where to install).
5
Flash ROM module (72 pin SIMM, (See 7.2 (1) for where to install). 4MB/8MB)
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)
Page: 6
Service Guide OKIPAGE 24DX/24DXn
Chapter 1 Configuration
1.4 Specification
(1) (2)
Type: Outside dimensions (excludes protruding portion) Weight
Desktop Height: 13.0" (331 mm) Width: 14.4" (366 mm) Depth: 18.2" (462 mm) 47 lbs. (21.3 kg)
(3) (4)
Development method Dry electrophotography Exposure method LED stationary head Paper used l Standard paper - Xerox 4200 (20 lbs) l Application paper (manual face-up feed) - Label - Envelope - OHP paper (Transparency) l Standard sizes - Letter - Legal - Executive - Envelope (with Duplex printing) - A4 - A5 (without Duplex printing) - B5 (without Duplex printing) - A6 (without Duplex printing)
l Applicable sizes -Width: 3.4" to 8.5" (86 to 216 mm) - Length: 5.5" to 14" (140 to 355.6 mm)
(5)
2 Automatic feed: 16 to 28 lbs (60 to 105 g/m ) - Manual feed: Label, OHP paper (transparency), Envelope, 16~36 lb. (6) Printing speed: First print: 8 seconds Continuous print: 24 sheets/min. [at duplex print: 12 sheets/min] o o Warm-up time: 90 seconds (at room temperature 77 F (25 C) and rated voltage (120 VAC)
(7) (8)
Paper feeding method Automatic feed or manual feed Paper delivery method Face down/face up
(9)
Resolution
600 dpi x 600 dpi (default) 600 x 1200 dots/inch 120 VAC +5.5%, -15% 230 VAC +10% Peak: Approx. 820W Typical operation: Approx. 350W Idle: Approx. 95W Power save mode: Approx. 25W
(10) Power input
(11) Power consumption
(12) Temperature and humidity In operation 50 - 90 (10-32) 20 - 80 77 (25) 35.6 (2) Power off mode 32-110 (0-43) 10-90 80.4 (26.8) 35.6 (2) During Storage 14-110 (-10 - 43) 10-90 ------------Unit F o ( C) % RH o F o ( C) o F o ( C)
o
Temperature Humidity Maximum wet bulb temperature Minimum difference of wet and dry bulb temperature
Notes: 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: 55 dBA or less At standby: 45 dBA or less Power save mode: 43 dBA or less
Toner cartridge kit - 6,000 (5% duty) Image drum cartridge - 30,000 (at 5% density, continuous printing); 19,000 pages (3 page/job) (Simplex printing*) * Simplex printing 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)
Page: 7
Service Guide OKIPAGE 24DX/24DXn
Chapter 1 Configuration
1.5 Safety Standards 1.5.1 Certification Label 1.5.2 Warning Label
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 24DX/24DXn
Chapter 1 Configuration
1.5.1 Certification Label
The safety certification label is affixed to th eprinter in the position below.
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Service Guide OKIPAGE 24DX/24DXn
Chapter 1 Configuration
1.5.2 Warning Label
The warning label is affixed to the portion which may cause an injury to human body. Follow the instructions on warning labels during maintenance.
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)
Page: 10
Service Guide OKIPAGE 24DX/24DXn
Chapter 2 Operation Description
2.0 Operation Description
OKIPAGE 24DX & 24DXn consists of a main control board, power supply unit (120V/230V), power supply unit (high voltage) and operator panel and an electro-photographic process mechanism. The control board receives data through a host I/F, decodes and edits the data, and stores the edited data in a memory. After completing edition of one page of data, it references the font memory and generates bit data on the same memory. At the same time, it transfers the bit image data to an LED head in units of one dot line. The electro-photographic process mechanism prints data on paper. The operator panel is used for operations and status display. Fig. 2-1 shows an OKIPAGE24DX / OKIPAGE 24DXn block diagram.
Figure 2-1 OKIPAGE 24DX block diagram
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Service Guide OKIPAGE 24DX/24DXn
Chapter 2 Operation Description
2.1 Main Control Board (BOARD-FFF)
The main control board consists of a one-chip CPU, LSI, program/font ROM's, DRAM's, EEPROM, host interface circuit, and a mechanism driving circuit. (1) One-chip CPU The one-chip CPU is a custom CPU (32-bit internal bus, 32-bit external bus, 120-MHz clock) that incorporates an RISC CPU and its peripheral devices, and has the following functions. Built-in Device Chip select controller Bus controller DRAM controller DMA controller Serial interface controller Parallel interface controller Timer Function Control peripheral LSI, ROM, DRAM and I/O device.
Transfer of data Host I/F to RAM Control of RS232C serial interface. Control of Centronics parallel interface. Generates various control timings for monitoring paper feeding and a paper size. Inputting of various signals Outputting of various control signals Inputs and outputs the sensor signals and motor signals, etc. Also performs I/O for EEPROM. Control of Main Motor. Executes the image data process for printing.
Serial I/O port
I/O port
Motor driver controller Image processing circuit
(2) Program/font ROM's
l
l
PCL ROM The program/font ROM's store the HP LJ5 emulation program and various types of font. MASK ROM is used as the program/font ROM's. PS ROM The program/font ROM's store the Adobe PostScript Level 2 program and its fonts.
(3) DRAM 16-Megabyte DRAM (64 Mbit DRAM x 2) is mounted as resident memory to be used for storing the program and providing various buffers. This DRAM is expandable up to 128 Mbytes by adding expansion memory (SIMMs). This DRAM provides the areas shown in the following table.
Memory area System area Raster buffer Receive buffer Page buffer
Use Working area used for the program Stores converted bit image data Stores temporarily the data received from the host interface Adds print information to the analyzed receive data and stored the resulted data. Stores soft fonts and macro data. Stores bit map fonts generated by the font rasterizer based on scalable font information.
Memory capacity setting MENU Expansion RAM Fixed Fixed Enable Expandable Enable Expandable ---Expandable
DLL/macro buffer Font cache buffer
---Enable
Expandable Expandable
(4) EEPROM EEPROM has a 16-kbit capacity and stores the following data.
l l l
Menu data Various counter data (page counter, drum counter, fuser counter, etc.) Adjustment parameters (LED head drive time, print start position, etc.)
(5) LSI (LZ9FF22) Function Control of serial interface between controller and 2nd tray, 3rd tray, Multi purpose feeder Control of serial interface between controller and Duplex unit Motor drive controler Control of Hopping motor I/O Port Inputting of various sensor signals Outputting if various control signals (6) Host interface This printer has the following interfaces to the host.
l l l
Built in device Serial I/O port
Centronics bidirectional parallel interface RS232C interface OKI HSP interface (Option)
The single effective interface or the automatic interface select mode can be selected using the menu. If the busy state of the printer continues for a long time period, the buffer near-full control releases the busy status at constant intervals even if the host side is busy so not to cause the interface time-out at the host side. (a) Centronics bidirectional parallel interface This is an interface conforming to IEEE-1284 and provides either of unidirectional and bidirectional communications according to each of the following communication modes.
l
Compatibility mode Unidirectional communications from the host to the printer. Nibble mode
l
This mode transmits 4-bit wide data from the printer to the host. In this mode, each 1-byte data is transferred in the form of two nibbles using ERROR, BUSY, FAULT, and SELECT signal leads. This mode can provide the bidirectional operation in combination with the compatibility mode.
l
ECP mode This mode provides the asynchronous bidirectional interface and transmits and receives 1-byte data using eight data signal leads under the semi-duplex control by the host.
When the power is turned on, the compatibility mode is automatically selected. The change to another mode from the compatibility mode is made through negotiation. (When the BI DIRECTION is set to ENABLE in the menu, this change can be performed.) (For the electrical/physical characteristics of this interface, see APPENDIX B) (b) RS232C serial interface The following protocol is supported for the serial interface conforming to EIA RS232C.
l l l
READY/BUSY (DTR HI or DTR LO) X-ON/X-OFF RBST X-ON
(For the electrical/ physical characteristics of the interface, see APPENDIX B) (c) OKI HSP interface (Option) This interface (slot) is an OKI unique universal interface that provides the platform to connect option boards (including those supplied by third party venders) such as the LAN connection expansion board and SCSI expansion board. Any expansion boards compatible with this interface can be mounted on the Control board in the piggyback board without modifying the program at the printer side. The conceptual diagram of the OKI HSP interface is shown in Figure 2-2. (For the electrical/physical characteristics of the OKI HSP interface, see the OKI HSP interface technical manual.)
(7) RAM module
l
Pin layout
l
Basic specification 72 pins Standard SIMM (32 bits buss width) [Note: EDO SIMM type] 60ns, 70ns, 80ns, 100ns 16 or 32 MB None
- Type: - Access time: - Capacity: - Parity:
(8) Flash ROM module
l
Pin layout
l
Basic specification 72 pins SIMM (32 bits buss width) 90ns 4 or 8 MB
- Type: - Access time: - Capacity:
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 24DX/24DXn
Chapter 2 Operation Description
2.2 Power Supply Unit
The power supply unit 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 Use
+5 V +30 V +8 V -8 V +3.8 V
Logic circuit supply voltage Motor and fan drive voltage and source voltage for high-voltage supply Reset circuit, RS232C Line voltage RS232C Line voltage LED HEAD supply voltage
(2) High voltage power supply circuit This circuit generates the following voltages necessary for electro-photographic processing from +30 V according to the control sequence from the control board. When cover open state is detected, +30 V supply is automatically interrupted to stop the supply of all the high-voltage outputs.
Output Voltage Use Remarks
Sub-CH CH DB SB TR CB (3) Photosensor
-15 uA -1.30 KV -220 V+300 V -450 V +4 KV/-1.3 kV +450 V-1350V
Voltage applied to Sub charging roller Voltage applied to charging roller Voltage applied to developing roller Voltage applied to toner supply roller Voltage applied to transfer roller Voltage applied to cleaning roller
Variable + Only
The photosensor mounted on this power supply unit supervises the paper running state during printing.
Figure 2-3 shows the sensor layout diagram.
Sensor
Function
Sensing state
Inlet sensor
Inlet sensor 2
Detects the leading part of the paper and ON: Paper exists gives the supervision timing for switching OFF: No paper exists from hopping operation to feeding operation. Supervises the paper running state and the paper size according to the paper reach time and running time. Detects the form width. ON: A4 or larger OFF: A4 or smaller Detects the leading part of the paper. Supervises the paper running state. ON: Paper exists OFF: NO paper exists
Paper sensor
Outlet sensor
Supervises the paper feed and size ON: Paper exists according to the time of arrival to the sensor OFF: No paper exists and the time of passage of paper. Detects the lack of toner. ON long: Toner low exists OFF short: No Toner low exists
Toner low sensor
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)
Page: 13
Service Guide OKIPAGE 24DX/24DXn
Chapter 2 Operation Description
2.3 Electro-photographic Process 2.3.1 Electro-photographic process mechanism 2.3.2 Electro-photographic process 2.3.3 Process operation descriptions 2.3.4 Revision of LED Head Illumination
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)
Page: 14
Service Guide OKIPAGE 24DX/24DXn
Chapter 2 Operation Description
2.3.1 Electro-photographic process mechanism
This mechanism prints image data from the control board on the paper by electro-photographic process. The Figure 2-4 shows the layout of the electro-photographic process mechanism.
(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) Hopping motor This motor is a pulse motor of 48 steps/rotation that is two-phase excited by the signal from the control board. It drives the hopping roller of the first tray and the front feed roller via two one-way clutches according to the direction of rotation. (3) Motor-Main
This motor is a pulse motor of 72 steps/rotation that is two-phase excited by the signal from the control board and is the main motor of this mechanism. (4) Clutch (for Registration) Switches the transfer of power to Roller Registration if necessary depending on the power Motor-Main and instructions from the control PCB. (5) Clutch (for Feed Roller) Switches the transfer of power to Feed Roller if necessary depending on the power from Motor-Main and instructions from the control PCB. (6) LED head Image data for each dot line from the control board is received by the shift register and latch register. The 4992 LEDs are driven to radiate the image data to the image drum. (7) Fuser The fuser consists of a heater, a heat roller, a thermistor and a thermostat. An AC voltage from the power supply board is applied to the heater under the control of the HEATON signal from the control board. This AC voltage heats the heater. The control board supervises the heat roller temperature via the thermistor, and regulates the heater roller at a predetermined temperature (185 °C : Normal paper, MEDIA TYPE = MEDIUM) by connecting or disconnecting the AC voltage supply to the heater. If the heater roller temperature rises abnormally, the thermostat of the heater voltage supply circuit is activated to cut the AC voltage supply forcibly. (8) Duplex Unit Duplex Unit is a unit, which is installed on the printer unit for controlling both-sided printing from the printer unit, intended for automatically reversing paper of which one side have been already printed on and re-feeding them to the unit for printing other side.
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)
Page: 15
Service Guide OKIPAGE 24DX/24DXn
Chapter 2 Operation Description
2.3.2 Electro-Photographic process
The electro-photographic processing is outlined below. Figure 2-5 shows the electro-photographic printing process. 1 Charging The surface of the image drum is uniformly charged with negative charges by applying a 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 part of the image drum surface is lowered, so that an electrostatic latent image associated with the print image is formed. 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 and a positive charge, opposite in polarity to the toner, is applied to the reverse side of the paper from the transfer roller, the toner is attracted by the positive charge and is transferred to the paper. As a result, the toner image formed on the image drum is transferred to the paper. 5 Temporary cleaning Residual toner that remains on the image drum without being transferred is made uniform by the cleaning roller and is temporarily attracted to the cleaning roller by static electricity. 6 Fusing The toner image transferred to the paper is fused under heat and pressure. Figure 2-6 shows an electro-photographic process timing chart.
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Page: 16
Service Guide OKIPAGE 24DX/24DXn
Chapter 2 Operation Description
2.3.3 Process operation descriptions
(1) Hopping Hoppings from the first tray and the front feeder are effected by a single hopping motor in the mechanism shown below.
Turning the Hopping motor in direction a (CW) drives the 1st Hopping Roller. Turning the Hopping motor in direction b (CCW) drives the Front Hopping Roller. Gear C and Hopping roller built-in one way bearing, so that turning each of these gears in reverse direction will not be transmitted to the corresponding roller.
(a) Hopping from the 1st Tray 1 Hopping Rotating the Hopping Motor in direction a (CW) drives the 1st Hopping Roller and the Sub Roller then pick up a sheet of paper in the 1st tray. The Main Motor is always driven in direction c (CCW) on printing. After the paper is fed approx. 30mm from the tray, the Clutch (Feed) drives the Align Roller to advance the paper until the Inlet Sensor turns on. 2 Aligning After turning on the Inlet Sensor, the paper fed by a predetermined length and choked up to the wedge space formed by the Registration Roller and the Pressure Roller to align the skew of the paper. 3 During the paper fed from the 1st tray, the built-in clutch of Gear C is idled and does not drive the Front Hopping Roller. 4 Feeding After aligning the paper, the Hopping Motor is turned off and stops hopping. Also the Clutch (Feed) is turned off and the Align Roller idles freely. Then the Clutch (Registration) is turned on and the Registration Roller starts to feed the paper. After the paper is fed, the 1st Hopping Roller idles freely by releasing built-in one way clutch, also the Sub
Roller idles freely by escaping the Planet Gear. 5 Printing starts after the paper turns off the Write Sensor.
(b) Hopping from the Front Feeder 1 Hopping The Front Feeder Plate is normally locked at the lower position by the Release Lever activating the Micro Switch. The top of the FF Cam which is attached to the end of the Front Hopping Shaft is normally located in the upper position (0 to 30 degree : home position). Rotating the Hopping Motor in direction b (CCW) drives the Front Hopping Shaft, the attached FF Cam and the Front Hopping Roller. When the FF Cam is rotated approx. 60 degrees, the Release Lever is pushed and the Front Feeder Plate lifts up allowing the Front Hopping Roller to pick up a sheet of paper. When the FF Cam is rotated approx. 180 degree, the Front Feeder Plate is pushed down and locked by the Release Lever again. When the FF Cam is rotated approx. 275 degrees the paper is fed until the Inlet Sensor turns off. 2 Aligning After turning on the Inlet Sensor, the paper is fed a predetermined length and choked up to the wedge space formed by the Registration Roller and the Pressure Roller to align the skew of the paper. 3 While the paper is fed from the Front Feeder Plate, the one way clutch of 1st Hopping Roller is idled and does not drive the 1st Hopping Roller and the Sub Roller. 4 Feeding After aligning the paper, the Hopping Motor is turned off and stops hopping. Then the Clutch (Registration) is turned on and the Registration Roller starts to feed the paper. After the paper is fed, the Front Hopping Roller drives the Front Hopping Shaft and the attached FF Cam with a small idle torque of the built-in one way clutch advancing to the Release Lever. The one way clutch is slipped and the FF Cam is stopped at the upper position (home position). The Front Hopping Roller idles until the paper clears the roller.
5 Printing starts after the paper turns off the Write Sensor.
(2) Feeding After finishing hopping, the pulse motor dedicated for driving the registration roller rotates to drive the registration roller. The registration roller advances the paper until it comes out of the registration roller. When the leading edge of the paper causes the paper sensor to turn on, the printing is started synchronously. Although Gear D is always rotating due to an all-time rotation of the main motor in direction c, the registration roller
would not rotate because the clutch (registration) is turned off. After completion of hopping, turn on the clutch (registration) to drive the registration roller. The registration roller will drive the paper until the paper has passed. (3) Charging Charging is effected by applying a DC minus voltage to the charge roller that is in contact with the image drum surface.
(4) Exposure Light emitted from the LED head radiates the image drum surface with negative charges. The surface potential of the charged part of the image drum drops, thereby forming an electrostatic latent image associated with the image signal.
(5) Developing Toner is attracted to the electrostatic latent image on the image drum surface to convert it into a visible toner image. Developing takes place at 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 part (low-potential part) of the image drum at the contact between the image drum and the developing roller, making the electrostatic latent image visible. (6) Transfer The transfer roller is composed of conductive sponge material and is designed to make the image drum surface and the paper closely into contact. Paper is placed over the image drum surface, and a positive charge, opposite in polarity to the toner, is applied to the paper from its reverse side. The application of a high positive voltage from the power supply to the transfer roller causes the positive charge induced to the transfer roller surface to be transferred to the paper at the contact between the transfer roller and the paper. As a results, toner charged negative that is attracted to the image drum surface is transferred to the upper side of the paper by the positive charge on the lower side of the paper.
(7) Fusing After the end of the transfer, the unfused toner image is fused on the paper under heat and pressure as it passes between the heater roller and the back-up roller. The heater roller with a Teflon coating incorporates a 750W heater (Halogen lamp), which heats the heat roller. A thermistor which is in contact with the heater roller regulates the heater roller at a predetermined temperature (about 180 ~ 200°C). A safety thermostat cuts off voltage supply to the heater by opening the thermostat in the event of abnormal temperature rises. The back-up roller is held under a pressure of 5 kg from the pressure spring at each side.
(8) Cleaning After the end of the transfer, residual toner on the image drum is attracted to the cleaning roller temporarily by static electricity to clean the image drum surface.
(9) Cleaning of rollers The charge roller, transfer roller and cleaning roller are cleaned in the following cases:
l l l
In warming up at power-on time In warming up after the cover is opened and closed When the number of accumulated sheets is 10 or more and the printout operation ends
Changes in bias voltage applied to each roller move adhesive toner from the roller to the image drum and return it to the developer. (10) Duplex Unit When the Duplex Unit receives an instruction for both-sided printing from the unit, the separator will be opened by the action of a solenoid within Duplex and the route will be shifted to the one into the Duplex after one-sided printing of papers, which are fed from the tray, are completed. At this time, as the roller (1) rotates in the direction of arrow A, a sheet is retracted in the rear of the cassette. And then, a given time later after the edge of the sheet passes through the IN SNS (DUP), the roller will reverse and the roller (1) rotates in the direction of arrow B and sending out the paper into the Duplex. After that, it passes though the roller (2) and (3), and is fed again into the unit, given another-sided printing and ejected.
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Service Guide OKIPAGE 24DX/24DXn
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 together as a pair. The LED correcting head consists of the correction control LSI , LED drivers , and an LED array. The block diagram of the LED correcting head is shown below. (1) Both sides wire-bonding head
In OKIPAGE 24DX/24DXn, the correction control of LED head is executed directly by the CPU. The procedure is as follows (i) LED head is set to the correction control read mode and all correction data stored in EEPROM within the correction control LSI are read by CPU, and stored temporarily in the memory. ii) Next LED head is set to the correction control direct mode and the correction data stored temporarily in the memory is transferred directly to the LED driver.
(i) Read of correction data
(ii) Transfer of correction data to head driver correction data
(2) One side wire-bonding head
(i) LED head is set to the correction control read mode and all correction data stored in EEPROM within the correction control LSI are read by CPU, and stored temporarily in the memory. (ii) Next, LED head is set to the correction control direct mode and the correction data stored temporarily in the memory is transferred directly to the LED driver. (i) Read of correction data
(ii) Transfer of correction data to head driver correction data
The LED driver 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 used in an LED head is shown below.
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 LOAD signal level is low, the normal mode is enabled. The printing operation is carried out in the following sequence. First, the printing data DATA3 through DATA0 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 STRB1-N through STRB4-N and actuates printing.
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Service Guide OKIPAGE 24DX/24DXn
Chapter 2 Operation Description
2.4 Paper Jam Detection
The paper jam detection function supervises the paper state at power-on time and during printing. In the event that the following state occurs, this function interrupts the printing process. If any of the following errors is present, recovery printing will be performed by removing the jammed paper (namely by opening the upper cover, removing the jammed paper and closing the upper cover). Error Paper input jam Cause of Error
l l
At power-on time, the paper is placed at the inlet sensor. After hopping operation is attempted three times, the leading edge of the paper does not reach the inlet sensor.
Paper feed jam
l l
At power-on time, the paper is placed at the paper sensor. The leading edge of the paper does not reach the paper sensor within a predetermined distance after the paper has reached the inlet sensor. l The trailing edge of the paper does not pass over the paper sensor within a predetermined distance after the leading edge of the paper has passed over the paper sensor. l The leading edge of paper does not reach the outlet sensor within a predetermined distance after the paper has reached the paper sensor.
l l
Paper exit jam
At power-on time, the paper is placed on the outlet sensor. The paper does not pass over the outlet sensor within a predetermined after the leading edge of the paper has reached the outlet sensor. l The paper size check with the manual feed specified considers the reference size as free size.
l
Paper size error
The size of the paper is supervised by the inlet sensors 1. It is detected that the paper does not pass over the inlet sensor 1 within predetermined range of distance. l 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. l The paper size check with the manual feed specified considers the reference size as free size.
l l l
Duplex input jam remove the paper Duplex feed jam1
Informs that a jam occurs in feeding papers to the Duplex Unit. Remove the paper.
Informs that a jam occurs in retracting papers into the reverse roller within the Duplex Unit. l Remove the paper
l
Duplex feed jam2
Informs that a jam occurs in reversing papers in the reverse roller papers within the Duplex Unit. l Remove the paper
Duplex feed jam3
l
Informs that a jam occurs in impinge-feeding papers within the Duplex Unit. l Remove the paper
l
Duplex open jam
Informs that the 1st tray is pulled out in paper-remaining state when feeding papers within the Duplex Unit. l Remove the paper.
l
Error 83
Informs that an I/F time-out occurs between the printer and Duplex.
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Service Guide OKIPAGE 24DX/24DXn
Chapter 2 Operation Description
2.5 Cover Open
When the stacker cover is opened, the cover open microswitch on the Power Supply Unit (High voltage) is turned off to cut the supply of +30V to the high voltage power supply circuit. As a result, all high-voltage outputs are interrupted. At the same time, the CVOPN signal is sent to the control board to notify it of the off state of the microswitch, and the Main board performs the cover open processing.
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Service Guide OKIPAGE 24DX/24DXn
Chapter 2 Operation Description
2.6 Toner Low Detection
l
Composition
The device consists of the stirring gear which rotates at a constant rate, the stirring bar and the magnet on the stirring bar. The stirring bar rotates through the link on 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 rotates due to the interlocking with the stirring gear. Even when the magnet on the stirring bar reaches the maximum height, since the other side is being dipped in the toner, the stirring bar is pushed by the stirring gear.
l
Operating during toner low state
l
When the stirring bar reaches the maximum height, since there is no resistance provided by the toner on the other side, it falls to the minimum height due to its own weight. Because of this, the time interval during which it is in encounter with the magnet of the sensor lever becomes long. By monitoring this time interval, toner low can be detected.
l 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 (2.727 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.
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Service Guide OKIPAGE 24DX/24DXn
Chapter 2 Operation Description
2.7 Stacker-full Detection
The sensor (interlocked with the lever) at the paper outlet to the stacker detects a stacker-full state (about 250 sheets) and stops printing of the ensuing pages.
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Service Guide OKIPAGE 24DX/24DXn
Chapter 2 Operation Description
2.8 Page Size Detection
The four tab pieces are driven according to the setting position of the paper guide through the cam interlocked with the paper guide of the paper cassette. When the paper cassette is inserted into the printer, the state of the tab pieces is detected by the microswitch to recognize the paper size.
State of Microswitches SW2 SW3 Paper Size SW4
SW1
0 0 0 1 1 1 1 1
1 1 0 1 0 1 1 0
1 0 1 1 1 0 0 0
1 1 1 0 1 1 0 1
Letter Executive A4 Legal 14 Legal 13 B5 A5 A6 (Not available)
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Service Guide OKIPAGE 24DX/24DXn
Chapter 3 Parts Replacement
Parts Replacements
This section explains the procedures for replacement of parts, assemblies, and units in the field. Only the removal procedures are explained here. Reverse the procedure for the installation.
3.1 Precautions for Parts Replacement 3.2 Parts Layout 3.3. Replacing Parts
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Service Guide OKIPAGE 24DX/24DXn
Chapter 3 Parts Replacement
3.1 Precautions for Parts Replacement
(1) Be starting parts replacement, remove the AC cable and interface cable. (a) Remove the Ac cable in the following procedure: i) Turn off ("o") the power switch of the printer. ii) Disconnect the AC inlet plug of the AC cable from the AC receptacle. iii) Disconnect the AC cable and interface cable from the printer. (b) Reconnect the printer in the following procedures: i) Connect the AC cable and interface cable to the printer. ii) Connect the AC inlet plug to the AC receptacle. iii) Turn on ("I") the power switch of the printer.
(2) Do not try disassembly as long as the printer is operating normally. (3) Do not remove unnecessary parts: try to keep disassembly to a minimum. (4) Use specified service tools. (5) When disassembling, follow the determined sequence. Otherwise, parts may be damaged. (6) Since screws, collars and other small parts are likely to be lost, they should temporarily be attached to the original positions. (7) When handling ICs such as microprocessors, ROM and RAM, and 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.
[Maintenance Tools] Table 3-1 lists the maintenance tools necessary for parts replacement.
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Service Guide OKIPAGE 24DX/24DXn
Chapter 3 Parts Replacement
3.2 Parts Layout
This section explains the layout of main parts.
Figure 3-1 Figure 3-2 Figure 3-3
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Service Guide OKIPAGE 24DX/24DXn
Chapter 3 Parts Replacement
Figure 3-1
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Service Guide OKIPAGE 24DX/24DXn
Chapter 3 Parts Replacement
Figure 3-2
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Service Guide OKIPAGE 24DX/24DXn
Chapter 3 Parts Replacement
Figure 3-3
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Service Guide OKIPAGE 24DX/24DXn
Chapter 3 Parts Replacement
Figure 3-4
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Service Guide OKIPAGE 24DX/24DXn
Chapter 3 Parts Replacement
3.3 How to Change Parts
This section explains how to change parts and assemblies appearing in the disassembly diagram below.
3.3.1 Faceup Stacker Assy 3.3.2 Contact Assy 3.3.3 DC Fan Motor 3.3.4 OP Panel Assy 3.3.5 Board-FFF 3.3.6 Stacker Assy, Damper Arm, Cover Rear 3.3.7 Sensor Stacker Full 3.3.8 Cable cover (guide film) 3.3.9 Damper 3.3.10 Feeder Unit - Front 3.3.11 Roller Assy - Regist 3.3.12 Motor - Main 3.3.13 Guide Assy - Eject 3.3.14 Heat Assy 3.3.15 Roller feed (C) 3.3.16 Roller Assy - BK 3.3.17 Roller Assy - Feed 3.3.18 LED Head 3.3.19 Paper cassette, ROLLER Assy - Feed, ROLLER - Assy, Hopping 3.3.20 Frame Assy - Separation 3.3.21 Transfer Roller / TR Gear / TR Bearing 3.3.22 EP lock shaft 3.3.23 LEVER Assy - Out Sensor 3.3.24 Toner sensor lever 3.3.25 Paper sensor lever 3.3.26 Inlet sensor lever 3.3.27 Power supply unit 3.3.28 Lever - Paper end & Lever - Paper near end
3.3.29 Guide Assy - Cassette (L) 3.3.30 Guide Assy - Cassette (R) 3.3.31 Removing / Installing Duplex Unit 3.3.32 Board-LEX 3.3.33 Connector (IMSA-9714N-14A) 3.3.34 Photo Sensor 3.3.35 SOLENOID Assy 3.3.36 Motor
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Service Guide OKIPAGE 24DX/24DXn
Chapter 3 Parts Replacement
3.3.1 Face-up Stacker Assy
(1) Turn off the AC Power Switch and unplug the AC Power Cord from the outlet. (2) Disconnect the Interface Cable (1). (3) Open the face-up stacker assy (2), unhook the right and left projections, and then remove the face-up stacker assy (2).
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Service Guide OKIPAGE 24DX/24DXn
Chapter 3 Parts Replacement
3.3.2 Contact Assy
(1) Open the stacker assy (1) and unscrew 2 screws (2) to remove the cover assy-side (L)(3). (2) Unscrew 2 screws (4) and remove the plate (contact) (5) and contact Assy (6).
Note! Don't deform the electrode plates of the contact assy (6).
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Service Guide OKIPAGE 24DX/24DXn
Chapter 3 Parts Replacement
3.3.3 DC Fan Motor
(1) Remove the cover assy-side (L). [See 3.3.2 (1)] (2) Remove the DC fan motor (1) by pulling out the connector of DC fan motor (1).
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Service Guide OKIPAGE 24DX/24DXn
Chapter 3 Parts Replacement
3.3.4 OP Panel Assy
(1) Disconnect the Interface cable (1). (2) Open the stacker assy (2), unscrew 2 screws (3) and remove the cover assy-side (R) (4). (3) Remove 2 screws (5) and flexible cable (6) to remove the operator panel assy (7).
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Service Guide OKIPAGE 24DX/24DXn
Chapter 3 Parts Replacement
3.3.5 Board - FFF
(1) Remove the operator panel assy and cover assy-side (R). [See 3.3.4] (2) Unscrew 2 screws (1) and remove the cover assy-corner (R) (2). (3) Unscrew 16 screws (3) and remove plate-shield (4). (4) Unscrew 3 screws (5) and 2 screws (6), unplug all the connectors (7) , and remove Board-FFF (8).
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Service Guide OKIPAGE 24DX/24DXn
Chapter 3 Parts Replacement
3.3.6 Stacker Assy, Damper Arm, Cover Rear
(1) Remove the face-up stacker assy. [See 3.3.1] (2) Remove the cover assy-side (L). [See 3.3.2 (1)] (3) Remove the OP panel assy. [See 3.3.4] (4) Remove the Board-FFF. [See 3.3.5] (5) Loosen 2 screws, unlock the latches from both sides and remove the rear cover (11). (6) Unscrew 2 screws (1) and remove frame cover (2). (7) Unscrew 3 screws (3) and remove the plate assy-side (R) (4). (8) Remove the lever back up release (5) and unlock the engagement of the projection on the right side of gear at the right side of the stacker cover. (9) Remove a screw 6 and washer (7), and then remove the stacker assy (8). (At this time, the damper arm (9) can also be detached simultaneously.)
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Service Guide OKIPAGE 24DX/24DXn
Chapter 3 Parts Replacement
3.3.7 Sensor Stacker Full
(1) Turn the AC power switch off. Unplug the AC power cord from the outlet. (2) Remove the Stacker assy. [See 3.3.6] (3) Remove four screws (1). Remove stacker mount 2 by releasing the tabs at position (2A) . (4) Remove Sensor stacker full (3) by spreading the plastic tabs on each side of sensor Assy (3) and lifting switch from cover.
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Service Guide OKIPAGE 24DX/24DXn
Chapter 3 Parts Replacement
3.3.8 Cable cover (guide film)
(1) Turn the AC power switch off. Unplug the AC power cord from the outlet. (2) Remove the stacker Assy. [See 3.3.6] (3) Unscrew 2 screws (1) release tabs at portion (1A) . Remove cable cover 2, guide film (3).
Note: Use care when replacing cable cover. Do not pitch, crimp, or cut cables or protective sheet.
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Service Guide OKIPAGE 24DX/24DXn
Chapter 3 Parts Replacement
3.3.9 Damper
(1) Remove the damper arm. [See 3.3.6] (2) Unscrew 2 screws (1) and remove the two dampers (2).
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Service Guide OKIPAGE 24DX/24DXn
Chapter 3 Parts Replacement
3.3.10 Feeder Unit - Front
(1) Open the manual feed assy (1) and release both right and left parts by pulling out the engagements on the lower part. (2) Stand the manual feed assy (1) on end and unhook the engagements with both right and left manual feed hopper stays. (3) Remove the OP panel assy. [See 3.3.4] (4) Unscrew 5 screws (2) and remove the feeder unit-front (3).
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Service Guide OKIPAGE 24DX/24DXn
Chapter 3 Parts Replacement
3.3.11 Roller Assy - Regist
(1) Remove the feeder unit-front. [See 3.3.10] (2) Remove an E-ring (3), gear assy-clutch (4), and four screws (1) in this order, and lift out the roller assy-registration (2).
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Service Guide OKIPAGE 24DX/24DXn
Chapter 3 Parts Replacement
3.3.12 Motor - Main
(1) Remove the stacker assy. [See 3.3.6] (2) Remove the feeder unit-front. [See 3.3.10] (At this point, the manual feed assy does not have to be removed.) (3) Remove the DC fan motor. [See 3.3.3] (4) Remove the contact assy. [See 3.3.2] (5) Remove the plate-FG (F) (1). (6) Remove the TR gear (2) and roller transfer (3). (Use Holder-TR Eject (16) for the removal.) (7) Unscrew 7 screws (4) and remove the main frame (5). (8) Unlock latches at two points of the lever back up release 6 and pull it out in right direction. (9) Unhook the EP lock spring (7) and remove the EP lock lever (8). (10) Take off the E ring (9) and remove the plate-FG (1st ) (10) and gear assy-clutch (11). (11) Unlock 2 latches to remove the motor assy-main (12) and idle gear (13). (12) Unscrew 2 screws (14) and remove the motor -main (15) .
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Service Guide OKIPAGE 24DX/24DXn
Chapter 3 Parts Replacement
3.3.13 Guide Assy - Eject
(1) Remove the lever back up release. [See 3.3.12(8)] (But the roller transfer/feeder unit front/plate-FG do not have to be removed) (2) Loosen 2 screws (1), unlock both side latches and remove the cover rear (2). [See 3.3.6(5)] (3) Unlock the latches on both sides of the guide assy-eject (3) and lift it out.
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Service Guide OKIPAGE 24DX/24DXn
Chapter 3 Parts Replacement
3.3.14 Heat Assy
(1) Remove the cover assy-side (L). [See 3.3.2 (1)] (2) Unplug the connectors (1), (2). (3) Unscrew 4 screws (3) and remove the heat assy (4) in the direction of the arrow by lifting the right side first.
Note !
l
As the heat assy (4) remains at high temperature soon after the power is turned off, start the work after it cools off sufficiently. Carry out a reset of the counter after the replacement. (See Section 4.2)
l
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Service Guide OKIPAGE 24DX/24DXn
Chapter 3 Parts Replacement
3.3.15 Roller feed (C)
(1) Remove the guide assy-eject. (See 3.3.13) (But roller transfer/feeder unit-front/plate-FG(F) do not have to be removed) (2) Remove the gear roller (C) (1) and bushing (2), bend (a) part of the plate-FG (BK) (3). Take off the carrier bearing (4) and remove the roller feed (c) (5) in the direction of the arrow.
Note ! Be careful not to deform (a) part of the plate-FG (BK) (3).
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Service Guide OKIPAGE 24DX/24DXn
Chapter 3 Parts Replacement
3.3.16 Roller Assy - BK
(1) Remove the heat Assy. [See 3.3.14] (2) Remove the lever back up release. [See 3.3.12 (8)] (3) Unlock the engagement with the plate-FG (BK) (1) and lift out the roller heat assy (2).
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Service Guide OKIPAGE 24DX/24DXn
Chapter 3 Parts Replacement
3.3.17 Roller Assy - Feed
(1) Remove the feeder unit -front. [See 3.3.10] (2) Remove the roller assy-feed (1) by unlocking a latch.
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Service Guide OKIPAGE 24DX/24DXn
Chapter 3 Parts Replacement
3.3.18 LED Head
(1) Remove the stacker assy (1). [See 3.3.6] (2) Unplug the PC connector (2) and 2 LED cables (3) from the LED head (4). (3) Open the hooks of the cover stacker 1 in the direction of the arrow and remove the LED head (4). (4) Pull out the head spring (5) from the post.
Note: Don't remove two LED cable (3) from the PC connector (2).
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Service Guide OKIPAGE 24DX/24DXn
Chapter 3 Parts Replacement
3.3.19 Paper cassette, ROLLER Assy - Feed, ROLLER Assy - Hopping
(1) Pull out the case assy-cassette (1) from the printer. (2) Remove the ROLLER Assy-Feed (2) and remove the ROLLER Assy-Hopping (3).
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Service Guide OKIPAGE 24DX/24DXn
Chapter 3 Parts Replacement
3.3.20 Frame Assy - Separation
(1) Turn the AC power switch off. Unplug the AC power cord from the outlet. (2) Pull out the case Assy-Cassette (1) from the printer. [See 3.3.19(1)] (3) Release two locks and remove frame assy-separation (2). (At this time, coil spring 3 is also removed. Be careful not to lose this spring.)
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Service Guide OKIPAGE 24DX/24DXn
Chapter 3 Parts Replacement
3.3.21 Transfer Roller / TR Gear / TR Bearing
(1) Open the stacker cover . (2) Unlock the lock by lifting the TR gear (1) to remove the TR gear (1) and roller transfer (2). (Use the Holder-TR Eject (5) for the removal.)
Note ! Don't place the removed roller transfer directly on the desk and so on. When placing it, lay a paper and the
like under it. (3) Remove right and left bearings (3) from the frame-main by sliding them inside while pushing them. At the same time, remove the 2 transfer springs (4).
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Service Guide OKIPAGE 24DX/24DXn
Chapter 3 Parts Replacement
3.3.22 EP lock shaft
(1) Turn the AC power switch off. Unplug the AC power cord from the outlet. (2) Remove Frame-Main [See 3.3.12 (7)]. (3) Remove screw (1). Turn EP lock lever (L) Assy (2) in the direction of arrow (A) . (4) Remove spring (3). (5) Drop EP lock shaft (4) down and turn in the direction of arrows (B) and remove it.
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Service Guide OKIPAGE 24DX/24DXn
Chapter 3 Parts Replacement
3.3.23 LEVER Assy - Out Sensor
(1) Turn the AC power switch off. Unplug the AC power cord from the outlet. (2) Remove the frame main [See 3.3.12(7)] (3) Press the clamp part of LEVER Assy- Out Sensor (1). Remove the LEVER Assy-Out Sensor (1) by pushing it upward from the lower side.
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