Oki OKIPAGE 4W PLUS User manual

All specifications are subject to change without notice.
OKIPAGE 4w
LED Page Printer
Maintenance Manual
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PREFACE
This Maintenance Manual describes the field maintenance methods for LED Page Printers.
This manual is written for use by service persons. Please note that you should refer to the Printer
Handbook for the handling and operating methods of the equipment.

CONTENTS
1. CONFIGURATION..................................................................................... 1 - 1
1.1 System Configuration ........................................................................ 1 - 1
1.2. Printer Configuration.......................................................................... 1 - 2
1.3 Specification ...................................................................................... 1 - 3
1.4 Safety Standards ............................................................................... 1 - 5
1.4.1 Certification Label.................................................................................... 1 - 5
1.4.2 Warning Label .........................................................................................1 - 5
2. OPERATION DESCRIPTION .................................................................... 2 - 1
2.1 Main Control Board............................................................................ 2 - 3
2.2 Power Supply Unit ............................................................................. 2 - 4
2.3 High-Voltage Power Supply Board .................................................... 2 - 4
2.4 Electro-Photographic Processor........................................................ 2 - 6
2.5 Electro-Photographic Process ........................................................... 2 - 10
2.5.1 Explanation of Each Process Operation.................................................. 2 - 12
2.6 Paper Jam Detection ......................................................................... 2 - 18
2.7 Toner Low Detection.......................................................................... 2 - 20
2.8 Cover Open ....................................................................................... 2 - 21
3. PARTS REPLACEMENT........................................................................... 3 - 1
3.1 Precautions for Parts Replacement................................................... 3 - 1
3.2 Parts Layout....................................................................................... 3 - 3
3.3 Replacing Parts ................................................................................. 3 - 6
3.3.1 Extend Plate ............................................................................................ 3 - 6
3.3.2 LED Head and Head Spring.................................................................... 3 - 7
3.3.3 Transfer Roller.........................................................................................3 - 8
3.3.4 Upper Cover Assy ................................................................................... 3 - 9
3.3.5 High-Voltage Power Supply Board .......................................................... 3 - 10
3.3.6 Top Cover Assy and Flat Cable Assy...................................................... 3 - 11
3.3.7 Paper Holder ........................................................................................... 3 - 12
3.3.8 Side Plate M and Idle Gear ..................................................................... 3 - 13
3.3.9 Registration Roller ................................................................................... 3 - 14
3.3.10 Drive Shaft E (Eject) and Eject Roller ..................................................... 3 - 15
3.3.11 Heat Assy ................................................................................................ 3 - 16
3.3.12 Pressure Roller B (Back Up Roller)......................................................... 3 - 19
3.3.13 Separator Guide ...................................................................................... 3 - 20
3.3.14 Pulse Motor (Main) .................................................................................. 3 - 22
3.3.15 Hopping Shaft Assy ................................................................................. 3 - 23
3.3.16 Paper Sensor E, Paper Sensor Exit and Toner Sensor Assy ................. 3 - 24
3.3.17 Base Plate ............................................................................................... 3 - 25

4. ADJUSTMENT........................................................................................... 4 - 1
4.1 Adjustment Types and Functions ...................................................... 4 - 1
4.1.1 Printer Driver ........................................................................................... 4 - 1
4.1.2 Engine Maintenance Utility ...................................................................... 4 - 2
4.2 Adjustment When Replacing a Part................................................... 4 - 2
4.2.1 Setting LED Head Drive Time ................................................................. 4 - 2
4.2.2 Setting the LED Head Dot Count ............................................................ 4 - 3
4.2.3 Uploading and Downloading EEPROM Data .......................................... 4 - 4
5. PERIODICAL MAINTENANCE ................................................................. 5 - 1
5.1 Periodical Replacement Parts ........................................................... 5 - 1
5.2 Cleaning............................................................................................. 5 - 1
5.2.1 Cleaning of LED Lens Array .................................................................... 5 - 1
6. TROUBLESHOOTING PROCEDURES .................................................... 6 - 1
6.1 Troubleshooting Tips ......................................................................... 6 - 1
6.2 Check Points Before Correcting Image Problems ............................. 6 - 1
6.3 Notes When Correcting Image Problems .......................................... 6 - 1
6.4 Preparation Before Troubleshooting.................................................. 6 - 1
6.5 Troubleshooting................................................................................. 6 - 2
6.5.1 Status Monitor Message List ................................................................... 6 - 2
6.5.2 Status Message Troubleshooting............................................................ 6 - 6
6.5.3 Image Troubleshooting............................................................................ 6 - 13
7. WIRING DIAGRAM................................................................................... 7 - 1
7.1 Interconnect Signal Diagram ............................................................. 7 - 1
7.2 PCB Layout........................................................................................ 7 - 2
8. PARTS LIST .............................................................................................. 8 - 1
APPENDIX A LOCAL PRINTING ............................................................... A - 1
APPENDIX B PARALLEL INTERFACE ..................................................... B - 1
APPENDIX C MAINTENANCE UTILITY..................................................... C - 1

1. CONFIGURATION

1 - 1
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.)
Electro-photographic
Processor
Paper Feed Mechanism
ENGINE UNI
T
Hopper
Plate
High-Voltage Power
Supply Board
Power Supply Unit
Main Control Board
Figure 1-1

1 - 2
1.2 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
Upper Cover Assy
EP Unit
Heat Assy
Top Cover Assy
Power Supply Unit
Main Control Board
High-Voltage Power
Supply Board

1 - 3
1.3 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 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/m2)
– Manual feed: Label,Envelope,OHPpaper(transpar-
ency)
(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 tempera-
ture 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

1 - 4
(12) Temperature and humidity
Temperature
During operation
In storage
10 to 32 ˚C
–10 to +43 ˚C
20 to 80% RH (relative humidity)
10 to 90% RH (relative humidity)
No condensation is permissible.
Humidity
C
aution: Temperature and humidity in storage are measured with the PN212
being 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 continuouts printing)

1 - 5
1.4 Safety Standards
1.4.1 Certification Label
The safety certification label is affixed to the following location of the OKIPAGE 4w:
1.4.2 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.
ODA
OEL
/OKI-INT

2. OPERATION DESCRIPTION

2 - 1
2. 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.

2 - 2
EEPROM
Parallel
I/F
LED head
Main motor
Electromagnetic
clutch
Sensors
TEMP
TR-VSEN
TR-ISEN
Reset circuit
10 MHz
MSM65917
(nX-8 core) Address
latch
EPROM
(52 KByte)
OE CS
A8 ~ A15
AD0 ~ AD7 A0 ~ A7
D0 ~ D3
A0 ~ A10
D0 ~ D7
D-RAM
(128 KByte)
Driver High-voltage power I/F
LED HEAT ON
5V
5V
OVL
CN
Parallel
I/F
Parallel
I/F
LED head
Main motor
Electromagnetic
clutch
LS07
Driver Main motor
Electromagnetic clutch
LED head
Driver
Driver AC output ON/OFF
Switching
power supply
<Power Supply Unit>
<Main Control Board>
<High-voltage Power Supply Board>
LED
Thermistor
EP cartridge
Heater (Halogen lamp)
AC (120 V/230 V)
Manual feed sensor Paper sensor Outlet sensor Toner sensor Cover open switch
LED
Sensors
TEMP
High-voltage
power I/F
TR-VSEN
TR-ISEN
HEAT ON
+24 V
+5 V
0VL
0VP
M
High voltage
power
supply
Figure 2-1 Block Diagram

2 - 3
2.1 Main Control Board
The main control board consists of a one-chip CPU, a program ROM, a DRAM, an EEPROM, a
hostinterfacecircuit, and amechanism driving circuit. Themechanism driving circuitconsists of
a 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)
incorporatingmask ROM and CPU peripheral devices. This CPU has the functions listed in
the table below.
Controls DRAM.
Built-in Device Function
DRAM controller
Transfers image data from Parallel I/F to DRAM, from DRAM to a video output port and
between CPU and DRAM.
Video output port
LED STB output port
Generates various control timings for monitoring paper feeding and a paper size.
Inputs the feedback signals from a high-voltage generation circuit and thermistor signal
.
DMA controller
Parallel interface controller
Timer
I/O port
A/D converter
Controls the parallel interface.
Controls LED head.
Inputs and outputs the sensor signals and motor signals, etc.
Also performs I/O for EEPROM.
(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.

2 - 4
2.2 Power Supply Unit
The power supply unit supplies +5 V and +24 V to the main control board according to 230 VAC
/120 VAC.
Used to generate a logic circuit and a high voltage.
Used to drive the motor and electromagnetic clutch.
Output voltage Application
+5 V
+24 V
The power supply unit also contains a heater drive circuit.
2.3 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
controlboard. Whenthecoverisopen,+5Vsupplyisautomaticallyinterruptedtostophigh-
voltage output.
Output Application
CH
DB
SB
CB
TR
Voltage
–1.35 KV
–300 V/+300 V
–450 V/ 0 V
+400 V
+500 V ~ +3.5 KV/–750 V
Voltage to be applied to a 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.
Caution: The TR voltage varies with medium and transfer roller impedance.

2 - 5
(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.
Sensor Function Sensing State
Manual feed
sensor ON: Paper exists. OFF: No paper exists
.
Monitors whether paper was inserted into the manual feed sensor
section.
Detects the leading part of the paper.
Monitors paper feeding.
Monitors paper feeding and the paper size according to the paper
sensor arrival and passing time.
Detects the low toner status.
Paper sensor
Outlet sensor
Toner sensor
ON: Paper exists.
OFF: No paper exists
.
ON: Paper exists.
OFF: No paper exists
.
ON (long): Toner low
OFF (short): Toner Hi
gh
Exit roller
Outlet sensor
Heat roller
Transfer roller
Feed roller
Toner
sensor
assy Manual feed sensor
Paper sensor
Hopping
roller
Paper feeding direction
Figure 2-2

2 - 6
2.4 Electro-Photographic Processor
The electro-photographic processor prints out the image data to be sent from the main control
board on sheets of paper. Figure 2-3 shows the layout drawing of the electro-photographic
processor.
(1) Image drum unit
Theimagedrumunitmakesatoneradheretotheformedelectrostaticlatentimagewithstatic
electricity. Thiselectrostatic latentimage isformed bythe lightsirradiated fromLED heads.
(2) Electromagnetic clutch
The electromagnetic clutch controls the rotation of the hopping roller according to signals
from the control block.

2 - 7
10
26.50 OFF
ON
64.60
20.32
Transfer roller (ø 15.000)
OFF
10
OFF
10
ON
Feed roller
12.72
23.18
17.23
6.85
6.77
Single tray
Hopping roller
32.00
Developing roller (ø 14.000)
Drum roller (ø 16.000)
LED head
Charge roller (ø 9.000) Cleaning roller
(ø 9.000)
Heat roller (ø 19.910)
Exit roller
Figure 2-3 Layout Drawing of Electro-Photographic Processor
Paper sensor
Manual feed sensor
Outlet sensor
Tray printing
Manual printing

2 - 8
(3) Pulse motor (Main)
Thispulsemotorof48steps/rotationistwo-phaseexcitedbythesignalfromthemaincontrol
board; it performs feeding control by switching normal rotation to reverse rotation or vice
versa and turning on/off the electromagnetic clutch. The relationship between the main
motor, electromagnetic clutch, regist gear, drum gear, hopping roller is shown in the table
below and on the subsequent pages.
Main Motor Electromagnetic Clutch
OFF
ON
Hopping Roller
Non-rotation
Rotation
Non-rotation
Regist Gear Drum Gear Operatio
n
Warm-u
p
Hopping
Prinitng
Non-rotation
Rotation
Rotation
Rotation
Rotation
Rotation
Normal rotation
Reverse rotation OFF
(4) LED head
Theshiftandlatchregistersreceiveimagedatafromthemaincontrolboardforeachdotline.
2,560 or 2,496 LEDs are driven to radiate the image drum.
(5) Heat Assy
The heat Assy consists of a heater, a heat roller, a thermistor, and a thermostat.
The power supply unit supplies AC voltage to the heater according to the HEATON signal
fromthemaincontrolboardtoheattheheatroller. Themaincontrolboardmonitorstheheat
roller temperature via the thermistor and keeps the temperature constant by turning on/off
the heater AC voltage supply.
If the heat roller temperature rises abnormally, the thermostat of the heater voltage supply
circuit functions to forcibly suspend the AC voltage supply.

2 - 9
Exit roller
Heat roller
Transfer roller
Cleaning roller
CH roller
Drum roller
Developing roller
Outlet
sensor
Paper sensor
Hopping roller
TRAY printing
Feed roller
Manual
feed
sensor
Manual printing
2Roller to be driven by reverse
rotation of pulse motor (Main) 1Motor to be driven by normal
rotation of pulse motor (main)
Roller control by pulse motor (main) 1 Normal rotation of pulse motor (main): 2 Reverse rotation of pulse motor (main):
Drum roller, transfer roller, cleaning roller, CH roller, developing roller, heat roller, exit roller rotation Drum roller, transfer roller, cleaning roller, CH roller, developing roller, heat roller, exit roller, feed roller, hopping roller rotation Hopping operation from the tray, however, is performed when the electromagnetic clutch is turned on.
Figure 2-4 Schematic Drawing of OKIPAGE 4w Paper Feeding