Oki OKICOLOR 8 User manual
OKICOLOR 8
Color LED Page Printer
Maintenance Manual
1999.7.14 Rev. 1
41057610TH Rev. 1 2 /
PREFACE
This maintenance manual provides procedures and techniques for the troubleshooting, maintenance, and
repair of OKICOLOR 8.
This manual is written for maintenance personnel, but it should always be accompanied with the
OKICOLOR 8 User’s Manual for procedures for handling and operating the OKICOLOR 8.
For repairing each component of OKICOLOR 8, see the Troubleshooting manual.
[Notices]
The contents of this manual are subject to change without prior notice.
Although reasonable efforts have been taken in the preparation of this manual to assure its accuracy, this
manual may still contain some errors and omissions. OKI will not be liable for any damage caused or
alleged to be caused, by the customer or any other person using this maintenance manual to repair,
modify, or alter the OKICOLOR 8 in any manner.
[Warning]
Many parts of OKICOLOR 8 are very sensitive and can be easily damaged by improper
servicing. We strongly suggest that OKICOLOR 8 be serviced by OKI’s authorized technical service
engineers.
41057610TH Rev. 1 3 /
CONTENTS
1.SPECIFICATIONS............................................................................................6
1.1 Basic System Configuration.............................................................................................6
1.2 Printer Specifications.......................................................................................................7
1.3 Option Specifications.......................................................................................................8
1.4 Basic Specifications........................................................................................................9
2.OPERATION...................................................................................................12
2.1 Main Control Board (PCE PCB)....................................................................................13
2.2 Engine Control Board (PX4 PCB)..................................................................................16
2.3 Power/Units....................................................................................................................17
2.4 Mechanical Processes...................................................................................................18
2.4.1 Electrophotographic processing mechanism....................................................19
2.4.2 Paper running process.....................................................................................25
2.5 Sensors..........................................................................................................................34
2.5.1 Paper related sensors......................................................................................34
2.5.2 Other sensors...................................................................................................35
2.6 Correction of Color Deviation.........................................................................................36
2.7 Transfer Control according to Environmental Changes
(Room Temperatures and Relative Humidities).............................................................36
2.8 Form Jam Detection.......................................................................................................37
2.9 Cover Opening...............................................................................................................37
2.10Toner Low Detection......................................................................................................38
2.11Page Size Detection......................................................................................................39
2.12Power-on Processing.....................................................................................................40
2.12.1Self-diagnostic test...........................................................................................40
3.PARTS REPLACEMENT................................................................................41
3.1 Precautions for Parts Replacement...............................................................................41
3.2 Parts Layout...................................................................................................................43
3.3 How to Change Parts.....................................................................................................47
3.3.1 Cover Assy Rear..............................................................................................48
3.3.2 Motor-Fan (80-25)............................................................................................49
3.3.3 Paper Eject Assy..............................................................................................50
3.3.4 Cover Assy Stacker, Guide Eject FD Assy.......................................................51
3.3.5 Frame Assy Upper............................................................................................52
3.3.6 Plate Support Assy...........................................................................................53
3.3.7 Limiter 2way (L), (R) / Plate Guide (L) , (R)......................................................54
3.3.8 Cover55
3.3.9 PCB Assy : PCE...............................................................................................56
3.3.10Motor Fan (CU).................................................................................................57
3.3.11PXF PCB/PX4 PCB..........................................................................................58
3.3.12Gear Heat Assy................................................................................................59
3.3.13Main Motor (A), (B) Assy..................................................................................60
3.3.14Gear One-way (Z30).........................................................................................61
3.3.15Motor Assy BT..................................................................................................62
3.3.16Power Supply Unit, Holder Inlet, Sheet Insulation............................................63
3.3.17Sensor Assy Box Toner....................................................................................64
3.3.18Square-shaped Connector...............................................................................65
3.3.19Hopping Motor..................................................................................................66
3.3.20Gear One-way..................................................................................................67
3.3.21Feeder Unit Front.............................................................................................68
3.3.22Manual Feed Hopper Assy...............................................................................69
3.3.23Guide Paper Input Assy....................................................................................70
3.3.24Two Lever Input Sensors, Lever 2nd Feed Sensor..........................................71
3.3.25Roller Registration, Roller Assy Hopping.........................................................72
41057610TH Rev. 1 4 /
3.3.26Roller Hopping..................................................................................................73
3.3.27PXU PCB/PXM PCB, Lever Resist Sensor......................................................74
3.3.28Paper End Lever...............................................................................................75
3.3.29PCO PCB (Operator Panel)..............................................................................76
3.3.30Holder Gear Toner Assy...................................................................................77
3.3.31Plate Latch Lever (FD), Spring Latch Lever (FD).............................................78
3.3.32Belt Cassette Assy...........................................................................................79
3.3.33High Voltage Power Supply Unit, Bracket HV (BT) Assy.................................80
3.3.34Eraser Bracket Assy, Eraser Bracket (KCM) Assy...........................................81
3.3.35Shaft Link..........................................................................................................82
3.3.36Contact (BL-R) Assy, Contact (CL-R) Assy......................................................83
3.3.37Contact (BL-L) Assy, Contact (CL-L) Assy.......................................................84
3.3.38Contact SB Assy...............................................................................................85
3.3.39PXC PCB..........................................................................................................86
3.3.40Heat Unit Assy..................................................................................................87
3.3.41Oil Roller Assy..................................................................................................88
3.3.42Lever Lock Heat (L)/(R), Guide Side Heat, Spring Lock...................................89
3.3.43PXL PCB..........................................................................................................90
3.3.44Heat Unit Guide Assy.......................................................................................91
3.3.45Holder LED Assy, LED Head............................................................................92
4.ADJUSTMENTS.............................................................................................93
4.1 Maintenance Modes and Their Functions......................................................................93
4.1.1 User maintenance mode..................................................................................93
4.1.2 System maintenance mode..............................................................................95
4.1.3 Engine maintenance mode...............................................................................97
4.2 Adjustments after Parts Replacement.........................................................................100
4.2.1 Confirm the LED head driving time.................................................................100
4.2.2 Color deviation correction...............................................................................102
5.PERIODIC MAINTENANCE.........................................................................105
5.1 Periodically Replaced Parts.........................................................................................105
5.2 Cleaning.......................................................................................................................105
5.3 Cleaning the LED Lens Array......................................................................................105
5.4 Cleaning the Pickup Roller...........................................................................................105
6.TROUBLESHOOTING PROCEDURES.......................................................106
6.1 Troubleshooting Tips...................................................................................................106
6.2 Points to Check before Correcting Image Problems....................................................106
6.3 Tips for Correcting Image Problems............................................................................106
6.4 Preparation for Troubleshooting..................................................................................107
6.5 Troubleshooting Flow...................................................................................................107
6.5.1 LCD status message/trouble list.....................................................................107
6.5.2 LCD message troubleshooting.......................................................................116
6.5.3 Image troubleshooting....................................................................................128
7.WIRING DIAGRAM......................................................................................145
7.1 Resistance Check........................................................................................................145
7.2 Program/Font ROM Location.......................................................................................149
8.Parts List......................................................................................................153
41057610TH Rev. 1 5 /
Appendix A CENTRONICS PARALLEL INTERFACE.....................................173
Appendix B HIGH CAPACITY SECOND PAPER FEEDER............................177
1. OUTLINE................................................................................................177
1.1Functions.............................................................................................................177
1.2External View and Component Names................................................................177
2. MECHANISM DESCRIPTION................................................................178
2.1General Mechanicsm...........................................................................................178
2.2Hopper Mechanism.............................................................................................179
3. PARTS REPLACEMENT.......................................................................180
3.1Precautions Concerning Parts Replacement.......................................................180
3.2Parts Layout........................................................................................................182
3.3Parts Replacement Methods...............................................................................183
3.3.1Idle rollers.............................................................................................184
3.3.2AOLT-PCB...........................................................................................185
3.3.3Hopping motor......................................................................................186
3.3.4Feed roller............................................................................................187
3.3.5Hopping roller.......................................................................................188
3.3.6Side frame (L) assy..............................................................................189
3.3.7Side frame (R) assy..............................................................................190
4. TROUBLESHOOTING...........................................................................191
4.1Precautions Prior to the Troubleshooting............................................................191
4.2Preparations for the Troubleshooting..................................................................191
4.3Troubleshooting Method......................................................................................192
4.3.1LCD Status Message List.....................................................................192
4.3.2Troubleshooting Flow...........................................................................193
5. CONNECTION DIAGRAM.....................................................................194
5.1Interconnection Diagram.....................................................................................194
5.2PCB Layout.........................................................................................................195
6. PARTS LIST..........................................................................................196
41057610TH Rev. 1 6 /
MMMM M MM M
LED head Discharging indicators
Centronics
interface Controller Junction board Pulse motors
Engine controller
Low-voltage
power unit
Fixing unit
High-voltage
power unit Second tray
Belt unit
<Sensors, switches, and thermistors>
Paper width sensor
Form size detector (4 bits)
Form end sensor
FF form end
FF home switch
Form feed sensor 1
Form feed sensor 2
Write sensor
Ejection sensor
Toner Low (Y.M.C.K)
EP Up/Down (Y.M.C.K)
Waste toner sensor
Resist Up/Down
Cover open switch (High-voltage
interlock switch)
Heater temperature thermistor
Backup temperature thermistor
Environment temperature sensor
Environment humidity sensor
Oil Roller switch
Fixing unit interlock switch
Waste toner box switch
Y-EP unit M-EP unit C-EP unit B-EP unit
PSIMM
x2
interface
SIMM
x4
interface
CEPM EPYEPK EPBELTHEATERREGISTFF
Operator panel
1. SPECIFICATIONS
1.1 Basic System Configuration
The basic system configuration of OKICOLOR 8 is illustrated in Figure 1.1.
Figure 1.1
41057610TH Rev. 1 7 /
1.2 Printer Specifications
This printer unit is composed with the following hardware.
•Electro-photographric processor
•Paper feeder
•Controller (CU part / PU Part)
•Operator panel
•Power board (High voltage part / PU part)
Figure 1-2 show the printer unit configuration.
Figure 1.2
Face-up Stacker Assy
Stacker Cover Assy
Rear Cover
Side Cover (L) Assy
Base Unit Operator Panel Assy
I/F Cover Assy
41057610TH Rev. 1 8 /
1.3 Option Specifications
Options available for OKICOLOR 8 are as follows.
(1) 2nd-Feeder
(2) RAM SIMM module (72 pin SIMM, 4MB/8MB/16MB/32MB)
* Make sure to use a set of 2 of the same volume size modules.
41057610TH Rev. 1 9 /
1.4 Basic Specifications
(1) Dimensions
Width: 18.8" (478mm) Length: 24.5" (622mm) Height: 15.6" (396mm)
(2) Weight
Approx. 48kg (106lbs)
(3) Form
Type: Ordinary paper (Hammermill 24lbs) and OHP (Only 3M CG3710)
Recommended paper (for color printing)
Color laser paper (20lb to 24lbs)
Note: The printout color tones are dependent upon the whiteness of the print
paper
Sizes: Letter, Legal (13"or 14"), Executive, A4, A5, B5, and A6 (1st tray and front feeder)
Reams:1st tray 20lbs to 28lbs
2nd tray 20lbs to 28lbs
Front feeder 20lbs to 53lbs (110lbs index)
(4) Printing speed
8 pages per minute (5 pages per minute: Card Stock, Labels & OHP/ 34lbs ~44lbs)
(5) Resolution
600 dots per inch x 600 dots per inch
(6) Input voltage
120VAC +5.5%, -15%
230VAC ±10%
(7) Power consumption
Peak: Typical operation
Idle: Power-save mode
(8) Frequency
50Hz or 60Hz +2%, -2%
(9) Noise
Operating: 54dB (without 2nd tray), 55dB (with 2nd tray)
Standby: 45dB
Power-saving: 43dB
(10)Consumables and service life
Toner cartridge: Approx. 3000 pages (5% duty) (each of C, M, Y, and K)
(Approx. 2000 sheets for the first)
Image drum: Up to 13,000 pages (5% duty, continuous) (each of C, M, Y, and K)
Waste Toner Box:Up to 25,000 Sheets
(under typical printout conditions: Single images of 5% density,
equivalent to printout using 14 toner cartridges)
Oil Roller Unit: Up to 10,000 sheets (Life defined in the number of actually printed
paper sheets)
(11)Periodically-replaced parts
Heat Unit Assy: 60,000 pages
Belt Cassette Assy:50,000 pages
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