Oki OKIPAGE4w User manual

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Service Guide OKIPAGE4w
Chapter 0 General Manual Information
OKIDATA OKIPAGE4w
LED Page Printer
Service Manual
Adobe Acrobat printable reference
copy of the OKIDATA Service Training Manual.
09/17/97
Note: This Adobe Acrobat version of the Okidata Service Training Manual was built with the pictures rendered
at 300 dpi, which is ideal for printing, but does not view on most displays well.
Okidata is a registered trademark, and OkiPage is a trademark of Oki Electric Industry Co., Ltd. HP, LaserJet and
PCL5e are trademarks of Hewlett-Packard Co. Adobe and Acrobat are trademarks of Adobe Systems Incorporated.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner
Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)

Table of Contents Page
Service Guide OKIPAGE4w
0 General Manual Information
Front Cover 1
Preface 2
1 Configuration
CONFIGURATION 3
Printer Configuration 4
Specification 5
Safety Standards - Certification Label 6
....Warning Label 7
2 Operation Description
OPERATION DESCRIPTION 8
Main Control Board 9
Power Supply Unit 10
High-Voltage Power Supply Board 11
Electro-Photographic Processor 12
Electro-Photographic Process 13
....Explanation of Each Operation - Hopping 14
....Printing and warm-up 15
....Charging 16
....Exposure 17
....Development 18
....Transfer 19
....Fusing 20
....Cleaning 21
Paper Jam Detection 22
Toner Low Detection 23
Cover Open 24
3 Parts Replacement
Parts Replacement 25
Precautions for Parts Replacement 26
Parts Layout 27
....Base Frame Unit 28
....Base Plate Unit 29
Replacing Parts 30
....Extend Plate 31
....LED Head and Head Spring 32
....Transfer Roller 33
....Upper Cover Assy 34
....High-Voltage Power Supply Board 35
....Top Cover Assy and Flat Cable Assy 36
....Paper Holder 37
....Side Plate M and Idle Gear 38
....Registration Roller 39
....Eject Roller Shaft and Eject Roller 40
....Fuser Assy 41
....Pressure Roller B (Back Up Roller) 42
....Separator Guide 43
....Pulse Motor (Main) 44
....Hopping Shaft Assy 45

Table of Contents Page
....Paper Sensor E, Paper Sensor Exit and Toner Sensor Assy 46
....Base Plate 47
4 Adjustment
Adjustment 48
....Adjustment Types and Functions 49
....Adjustment When Replacing a Part 50
5 Periodical Maintenance
Periodical Maintenance - Periodical Replacement Parts 51
Cleaning 52
6 Troubleshooting Procedures
Troubleshooting Procedures - Troubleshooting Tips 53
Check Points Before Correcting Image Problems 54
Notes When Correcting Image Problems 55
Preparation Before Troubleshooting 56
Troubleshooting 57
....Status Monitor Message List 58
....Status Message Troubleshooting 59
........The OKIPAGE 4w malfunctions after the power supply has
been turned on. 60
........[JAM error] - Paper input jam 61
........[JAM error] - Paper feed jam 62
........Paper exit jam 63
........Paper size error 64
........Fuser assy error 65
....Image Troubleshooting 66
........An image is light or blurred entirely. 67
........Dark background density 68
........Paper is blank. 69
........Vertical black band/stripe 70
........Cyclic defect 71
........Print voids. 72
........Poor fusing 73
........Vertical white band/stripe 74
........Figure 6-4 75
........Figure 6-5 76
7 Wiring Diagram
Wiring Diagram - Interconnect Signal Diagram 77
PCB Layout 78
8 Parts List
Cover Assy Upper 79
Base Frame Unit 80
Base Plate Unit 81
A Local Printing
Local Printing 82
B Parallel Interface
Parallel Interface - (1) Connector 83
Cable 84
Parallel I/F signals 85
Signal level 86
Interface circuit 87

Table of Contents Page
Timing charts 88
C Maintenance Utility
Maintenance Utility - Outline Of Maintenance Utility 89
ROLE OF MAINTENANCE UTILITY 90
OUTLINE OF MAINTENANCE UTILITY FUNCTIONS 91
DETAIL OF EACH FUNCTION - Engine Menu Setting 92
....Engine Counter 93
....Exit 94
....Printer Status 95
....Test Print 96
....Option 97
....About 98
....Reload 99

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Service Guide OKIPAGE4w
Chapter 0 General Manual Information
PREFACE
This Service Manual describes the maintenance procedures for OKIPAGE 4w LED Page Printers.
This manual is written for use by service personnel. Refer to the customer documentation for handling
and operating procedures.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner
Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)

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Service Guide OKIPAGE4w
Chapter 1 Configuration
1. CONFIGURATION
1.1 System Configuration
The OKIPAGE 4w consists of a control block, a power supply unit, and an engine block. (See Figure 1-1.)
Figure 1-1
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner
Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)

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Service Guide OKIPAGE4w
Chapter 1 Configuration
Printer Configuration
The printer unit consists of the following five hardware components:
• Electro-Photographic Processor
• Paper Feeder
• Main Control Board
• High-Voltage Power Supply Board
• Power Supply Unit
Figure 1-2 is the configuration of the printer unit.

Figure 1-2
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner
Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)

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Service Guide OKIPAGE4w
Chapter 1 Configuration
Specification
(1) Type Desktop
(2) Outside dimensions Height 5.9" (150 mm) (excludes protruding Width 12.2" (310 mm) portion) Depth 7.5" (191 mm)
(3) Weight 1.71 lb (3.8 kg)
(4) Development method Dry non-magnetic development system Exposure method LED stationary head
(5) Paper used Type
• Standard paper
– Xerox 4200 (20 lbs)
• Application paper (manual face-up feed)
– Label
– Envelope
– OHP paper (Transparency)
Size 14" (355.6 mm) (Max.) x 8.5" (215.9 mm)
Thickness
– Automatic feed: 16 to 28 lbs (60 to 90 g/m 2 )
– Manual feed: Label, Envelope, OHP paper (transparency)
(6) Printing speed First print: 25 seconds (A4) (after warm-up) Continuous print: 4 sheets/minute
(A4) Warm-up time: 40 seconds (120 VAC for ODA, 230 VAC for OEL/INT)
(at room temperature 77 °F (25 °C))
(7) Paper feeding method Automatic paper feed or manual paper feed
(8) Paper delivery method Face down
(9) Resolution 300 dpi x 300 dpi, 600 dpi x 600 dpi (quasi)
(10) Power input 230 VAC +15%, -14% (for OEL/INT) 120 VAC +6%, -15% (for ODA)
(11) Power consumption Peak: 450W Typical operation: 100W Idle: 30W Power save mode: 5W
(12) Temperature and humidity

Caution: Temperature and humidity in storage are measured with the OKIPAGE 4w packed; they are
valid for one year.
(13) Noise During operation: 48 dB (A) or less Standby: 38 dB (A) or less
(14) Consumables Toner cartridge kit 1,000 (5% duty) Image drum cartridge 10,000 (at continuous printing)
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner
Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)

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Service Guide OKIPAGE4w
Chapter 1 Configuration
Safety Standards
Certification Label
The safety certification label is affixed to the following location of the OKIPAGE 4w:
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner
Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)

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Service Guide OKIPAGE4w
Chapter 1 Configuration
Warning Label
Warning labels are affixed to the locations that may cause bodily injury.
During maintenance, do work with enough care while following instructions on these warning labels.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner
Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)

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Service Guide OKIPAGE4w
Chapter 2 Operation Description
OPERATION DESCRIPTION
The OKIPAGE 4w consists of a main control board, a high-voltage power supply board, a power supply
unit, and an electro-photographic processor. The OKIPAGE 4w receives print data from a higher-level
interface and sequentially stores it in memory. The OKIPAGE 4w decodes and edits the received data
while storing print data from the interface in memory. It sequentially transfers the edited data to the LED
head for each dot line. The electro-photographic processor then prints the data on sheets of paper.
The display of the higher-level host is used for device operation and status display.
Figure 2-1 is the block diagram of the OKIPAGE 4w.
Figure 2-1 Block Diagram
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner
Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)

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Service Guide OKIPAGE4w
Chapter 2 Operation Description
Main Control Board
The main control board consists of a one-chip CPU, a program ROM, a DRAM, an EEPROM, a host
interface circuit, and a mechanism driving circuit. The mechanism driving circuit consists of an LED
head, a main motor, and an electromagnetic clutch.
(1) One-chip CPU
The one-chip CPU is a custom CPU (8-bit internal bus, 8-bit external bus, 10-MHz clock) incorporating
mask ROM and CPU peripheral devices. This CPU has the functions listed in the table below.
(2) Program ROM
Program ROM contains a program for the equipment. EPROM is used as program ROM. When mask
ROM in the one-chip CPU explained in (1) above is valid, the EPROM is not mounted. (For details on
short wiring setting, see Section 7.2.)
(3) DRAM
DRAM is used as resident memory.
(4) EEPROM
EEPROM holds the following data:
• Menu data
• Counter value
• Adjustment value
(5) Parallel interface
The parallel interface receives parallel data from the host; it conforms to the IEEE1284 specification.

Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner
Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)

Page: 10
Service Guide OKIPAGE4w
Chapter 2 Operation Description
Power Supply Unit
The power supply unit supplies +5 V and +24 V to the main control board from 230 VAC /120 VAC.
The power supply unit also contains a heater drive circuit.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner
Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)

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Service Guide OKIPAGE4w
Chapter 2 Operation Description
High-Voltage Power Supply Board
(1) High-Voltage power supply circuit
The high-voltage power supply circuit generates the following voltages required for the
electro-photographic processor from +5 V according to the control sequence from the main control
board. When the cover is open, +5 V supply is automatically interrupted to stop high-voltage output.
Caution: The TR voltage varies with medium and transfer roller impedance.
(2) Sensors
The high-voltage power supply board consists of the high-voltage power supply circuit that supplies
power to the electro-photographic processor system and the photosensor that detects a paper feeding
system and toners.
Figure 2-2 shows the sensor layout drawing.

Figure 2-2
Sensor Function Sensing State
Manual feed
sensor Monitors whether paper was inserted into the manual feed sensor section. ON: Paper exists. OFF: No paper exists.
Paper sensor Detects the leading edge of the paper.
Monitors paper feeding. ON: Paper exists. OFF: No paper exists.
Outlet sensor Monitors paper feeding and the paper size
according to the paper sensor arrival and
passing time.
ON: Paper exists.
OFF: No paper exists.
Toner sensor Detects the low toner status. ON (long): Toner low
OFF (short): Toner high
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner
Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)

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Service Guide OKIPAGE4w
Chapter 2 Operation Description
Electro-Photographic Processor
The electro-photographic processor prints out the image data sent from the main control board on sheets
of paper. Figure 2-3 shows the layout of the electro-photographic processor.
(1) Image drum unit
The image drum unit makes toner adhere to the electrostatic latent image with static electricity. This
electrostatic latent image is formed by light from the LED heads.
(2) Electromagnetic clutch
The electromagnetic clutch controls the rotation of the hopping roller according to signals from the
control board.
(3) Pulse motor (Main)
This pulse motor of 48 steps/rotation is two-phase controlled by the signal from the main control board; it
controls feeding by changing rotation direction and turning on/off the electromagnetic clutch. The
relationship between the main motor, electromagnetic clutch, regist gear, drum gear, and hopping roller
is shown in the table below and on the subsequent pages.