Okidata OKIPAGE 8p, OKIPAGE 8w MAINTENANCE MANUAL
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OKIPAGE
8p /8
LED Page Printer
Maintenance Manual
ODA/OEL/INT
1998.11. 4 Rev.1
All specifications are subject to change without notice.
40909901TH
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 Option(OKIPAGE 8p Only) ................................................................ 1 - 3
1.4 Specification ...................................................................................... 1 - 4
1.5 Safety Standards ............................................................................... 1 - 6
1.5.1 Certification Label.................................................................................... 1 - 6
1.5.2 Warning Label ......................................................................................... 1 - 6
2. OPERATION DESCRIPTION .................................................................... 2 - 1
2.1 Main Control Board............................................................................ 2 - 4
2.2 Power Supply Unit ............................................................................. 2 - 6
2.3 High-Voltage Power Supply Board .................................................... 2 - 6
2.4 Electro-Photographic Processor........................................................ 2 - 8
2.5 Electro-Photographic Process ........................................................... 2 - 12
2.5.1 Explanation of Each Process Operation.................................................. 2 - 14
2.6 Paper Jam Detection ......................................................................... 2 - 20
2.7 Toner Low Detection.......................................................................... 2 - 22
2.8 Cover Open ....................................................................................... 2 - 23
2.9 Detecting I/D Unit existence .............................................................. 2 - 24
3. PARTS REPLACEMENT........................................................................... 3 - 1
3.1 Precautions for Parts Replacement................................................... 3 - 1
3.2 Parts Layout....................................................................................... 3 - 3
3.3 Replacing Parts ................................................................................. 3 - 9
3.3.1 Hopper Plate ........................................................................................... 3 - 9
3.3.2 LED Head and Head Spring.................................................................... 3 - 10
3.3.3 Transfer Roller......................................................................................... 3 - 11
3.3.4 How to remove Cover Upper Assy .......................................................... 3 - 12
3.3.5 Upper Cover Assy ................................................................................... 3 - 13
3.3.6 High-Voltage Power Supply Board (P2H) ............................................... 3 - 14
3.3.7 Top Cover Assy and Flat Cable Assy...................................................... 3 - 15
3.3.8 Paper Holder ...........................................................................................3 - 16
3.3.9 Side Plate M and Idle Gear ..................................................................... 3 - 17
3.3.10 Heat Assy ................................................................................................ 3 - 18
3.3.11 Drive Shaft E (Eject) and Eject Roller ..................................................... 3 - 19
3.3.12 Pressure Roller B (Back Up Roller)......................................................... 3 - 20
3.3.13 Separator Guide ...................................................................................... 3 - 21
3.3.14 Pulse Motor (Main) .................................................................................. 3 - 25
3.3.15 Hopping Shaft Assy ................................................................................. 3 - 26
3.3.16 Regist Roller ............................................................................................ 3 - 27
3.3.17 Paper Sensor E, Paper Sensor Exit and Toner Sensor Assy ................. 3 - 28
3.3.18 Base Plate ............................................................................................... 3 - 29
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 Uploading and Downloading EEPROM Data .......................................... 4 - 3
5. PERIODICAL MAINTENANCE ................................................................. 5 - 1
5.1 Periodical Replacement Parts ........................................................... 5 - 1
5.2 Cleaning............................................................................................. 5 - 1
5.2.1 Cleaning the 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 - 3
6.5.1 Status Monitor Message List ................................................................... 6 - 3
6.5.2 Status Message Troubleshooting ............................................................ 6 - 7
6.5.3 Image Troubleshooting ............................................................................ 6 - 13
7. WIRING DIAGRAM................................................................................... 7 - 1
7.1 (a)Interconnect Signal Diagram (OKIPAGE 8p) ................................ 7 - 1
(b)Interconnect Signal Diagram (OKIPAGE 8w)................................ 7 - 2
7.2 PCB Layout........................................................................................ 7 - 3
7.2.1 Main Control Board (NMA PCB) (OKIPAGE 8p) ..................................... 7 - 3
7.2.2 a) Main Control Board (HBY PCB) (OKIPAGE 8w EPROM type) ........... 7 - 4
b) Main Control Board (H63 PCB) (OKIPAGE 8w Mask ROM type)....... 7 - 5
7.2.3 High-Voltage Power Supply Board .......................................................... 7 - 6
8. PARTS LIST .............................................................................................. 8 - 1
APPENDIX A LOCAL PRINTING/ DEMO PAGE PRINTING ................... A - 1
APPENDIX B PARALLEL INTERFACE ................................................... B - 1
APPENDIX C MAINTENANCE UTILITY GUI MANUAL (OKIPAGE 8P).. C - 1
APPENDIX D MAINTENANCE UTILITY GUI MANUAL (OKIPAGE 8W). D - 1
1. CONFIGURATION
1. CONFIGURATION
1.1 System Configuration
The OKIPAGE 8p/8w consists of a control block, a power supply unit, and an engine block. (See
Figure 1-1.)
ENGINE UNIT
Paper Feed Mechanism
Hopper
Plate
Electro-photographic
Processor
Main High-Voltage
Power Supply Board
Sub High-Voltage
PowerSupply Board
Power Supply Unit
Main Control Board
4MB Memory
Expansion Board
(OKIPAGE 8p Only)
Figure 1-1
1 - 1
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 (two Boards)
• Power Supply Unit
Figure 1-2 is the configuration of the printer unit.
Upper Cover Assy
I/D Unit (Type 6)
Top Cover Assy
High-voltage Power
Supply Board (P2H)
Heat Assy
Main Control Board
High-voltage Power
Supply Board (P6L)
1 - 2
1.3 Option(OKIPAGE 8p Only)
(1) 4MB N4A-PCB Option Memory Board
1 - 3
1.4 Specification
(1) Type Desktop
(2) Outside dimensions Height 6.7” (170 mm)
(excludes protruding Width 12.8” (324 mm)
portion) Depth 8.1” (207 mm)
(3) Weight 4.2 kg (8w) (with Image Drum Cartridge and Toner Cartridge)
(4) Development method Dry non-magnetic development system
Exposure method LED stationary head
(5) Paper used <Type>
4.3 kg (8p)
• Standard paper
– Xerox 4200 (20 lbs)
• Application paper (manual face-up feed)
– Label
– Envelope
– OHP paper (Transparency)
<Size>
14" (355.6 mm) x 8.5" (215.9 mm) (Max.)
5" (127mm) x 3" (76.2mm) (Min.)
<Thickness>
– Automatic feed: 16 to 28 lbs (60 to 105 g/m2)
– Manual feed: Label, Envelope, OHP paper (transpar-
ency), 16 to 32 lbs (60 to 120g/m2)
(6) Printing speed First print: 13 seconds (A4) (after warm-up)
Continuous print: 8.1 sheets/minute (Letter)
7.7 sheets/minute (A4)
Warm-up time: 35 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 up
(9) Resolution 600 dpi x 600 dpi (OP8w) 600 dpi x 1200 dpi (OP8p)
(10) Power input 230 VAC ±10% (for OEL/INT)
120 VAC +6%, -15% (for ODA)
(11) Power consumption OP8w OP8p
Peak: Approx. 450W 450W
Typical operation: Approx. 160W 180W
Idle: Approx. 32W 32W
Power save mode: Approx. 4W 6W
1 - 4
(12)Temperature and humidity
During operation
In storage
Caution:
Temperature and humidity in storage are measured with the OKIPAGE 8p/8w
being packed; they are valid for one year.
Temperature
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
(13)Noise During operation: Avg. 50 dB (A), slow (without peak sounds)
(conformity with ANSI) Standby: Background level
(14)Consumables Toner cartridge kit 1,500 (5% duty)
........
45g cartridge kit
Image drum cartridge 10,000 (at continuous printing)
1 - 5
1.5 Safety Standards
1.5.1 Certification Label
The safety certification label is affixed to the following location of the OKIPAGE 8p/ 8w
1.5.2 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.
For OEL, OKI-INT
1 - 6
For ODA, OEL, OKI-INT
For China, TAIWANFor Korea
2. OPERATION DESCRIPTION
2. OPERATION DESCRIPTION
The OKIPAGE 8p/8w consists of a main control board, two high-voltage power supply board, a
power supply unit, and an electro-photographic processor. The OKIPAGE 8p/8w receives print
data from a higher-level interface and sequentially stores it in memory. The OKIPAGE 8p/8w
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 8p/8w.
2 - 1
PLUNGER LED HEAD
Motor
2 - 2
Parallel
I/F
CENT
LS07
HEAD2HEAD1PJ
+5V+26V
POWER
MOTOR Main PCB NMA-
0V5V
Motor Driver
MTD2005F
CPU
(R3000)
Data Bus
Address Bus
OSC
7MHz
0VP0V
RST
EEPROM
Serial I/F
(x16)
LC26023A
1kb
OSC
10MHz
LSI
HIVOL
DRAM 2MB
M-ROM
4M x 16
Mask ROM 8MB
HC244
HIVOL2
Red
Amber
Amber
DRAM
1M x 16
0V
OPTION
O
P
T
I
O
N
PCB N4A-
DRAM
1M x 16
DRAM 4MB
Power Supply Unit
High Voltage Power Unit
P2H
Figure 2-1-1 Block Diagram (OKIPAGE 8p)
High Voltage Power Unit
P6L
ID Unit
PLUNGER LED HEAD
Motor
2 - 3
Parallel
I/F
CN4
LS07
+5V+26V
HEAD2HEAD1CN8
CN2
CN7
0V5V
0VP0V
Motor Driver
MTD2005F
CPU
(nX8)
PCB H63-ONLY
Internal
MASK ROM
62KB
OSC
16MHz
Serial I/F
DRAM Bus
(Data : 4)
(Address : 11)
RST
EEPROM
1kb
EPROM
64KB
LS373
PCB HBY-ONLY
DRAM
512kB
DRAM
1M x 4
HC125
CN10CN1
High Voltage Power Unit
Power Supply Unit
Figure 2-1-2 Block Diagram (OKIPAGE 8w)
P2H
High Voltage Power Unit
P6L
ID Unit
2.1 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
a LED head, a main motor, and an electromagnetic clutch.
Note: There are 2 type Main Control Boards for OP 8w EPROM is mounted on one board (HBY-
PCB) On the other board (H63-PCB), no EPROM is mounted. (the firmware is in the
masked CPU). The appearance of these PCB's are completely different each other.
(Refer Section 7.2.2).
(1) One-chip CPU
• OKIPAGE 8p
The one-chip CPU is a custom CPU (32-bit internal bus, 16-bit external bus, 28-MHz clock).
This CPU has the functions listed in the table below.
Built-in Device Function
DRAM controller
DMA controller
Parallel interface controller
Video output port
LED STB output port
Timer
I/O port
Controls DRAM.
Transfers image data from Parallel I/F to DRAM, from DRAM to a video output port and
between CPU and DRAM.
Controls the parallel interface.
Controls LED head.
Generates various control timings for monitoring paper feeding and a paper size.
Inputs and outputs the sensor signals and motor signals, etc.
Also performs I/O for EEPROM.
• OKIPAGE 8w
The one-chip CPU is a custom CPU (8-bit internal bus, 8-bit external bus, 16-MHz clock)
incorporating mask ROM and CPU peripheral devices. This CPU has the functions listed in
the table below.
Built-in Device Function
DRAM controller
DMA controller
Controls DRAM.
Transfers image data from Parallel I/F to DRAM, from DRAM to a video output port and
between CPU and DRAM.
Parallel interface controller
Video output port
LED STB output port
Timer
I/O port
A/D converter
Controls the parallel interface.
Controls LED head.
Generates various control timings for monitoring paper feeding and a paper size.
Inputs and outputs the sensor signals and motor signals, etc.
Also performs I/O for EEPROM.
Inputs the feedback signals from a high-voltage generation circuit and thermistor signal.
2 - 4
(2) • Program ROM (OKIPAGE 8w Only)
Program ROM contains a program for the equipment. EPROM is used as program ROM.
(EPROMtype PCB) For details PCB Layout see Section 7.2.2.
• Program & Font ROM (OKIPAGE 8p Only)
The Program & Font ROM store the various types of emulation program and fonts.
Mask ROM is used for a Program & Font ROM.
(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 Centronics
specification. IEEE-1284 B: – directional parallel is supported.
(6) RAM Board (OKIPAGE 8p option)
4MB (2MB DRAM x 2) of DRAM is resided on the RAM board.
2 - 5
2.2 Power Supply Unit
The power supply unit supplies +5 V and +26 V to the main control board according to 230 VAC /
120 VAC.
Output voltage Application
+5 V
+26V
Used to generate a logic circuit and a high voltage.
Used to drive the motor and electromagnetic clutch.
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
control board. When the cover is open, +5 V supply is automatically interrupted to stop highvoltage output.
Output Application
CH
–1.3 KV
DB
–265 V/+265 V
SB
–550 V/ 0 V
CB
+400 V/–1.35 KV
TR
+500 V ~ +3.5 KV/–750 V
Voltage
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.
P2H-PCB
P2H-PCB
P2H-PCB
P6L-PCB
P2H-PCB
Remarks
Caution:
The TR voltage varies with medium and transfer roller impedance.
2 - 6
(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.
Exit roller
Outlet sensor
Heat roller
Transfer roller
Paper sensor
Toner
sensor
assy
Manual feed sensor
Paper feeding direction
Feed roller
Hopping
roller
Figure 2-2
Sensor Function Sensing State
Manual feed
sensor
Paper sensor
Outlet sensor
Toner sensor
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.
ON: Paper exists.
OFF: No paper exists.
ON: Paper exists.
OFF: No paper exists.
ON: Paper exists.
OFF: No paper exists.
ON (long): Toner low
OFF (short): Toner High
2 - 7
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
The image drum unit makes a toner adhere to the formed electrostatic latent image with static
electricity. This electrostatic latent image is formed by the lights irradiated from LED heads.
(2) Electromagnetic clutch
The electromagnetic clutch controls the rotation of the hopping roller according to signals
from the control block.
2 - 8
Exit roller
Heat roller
(ø 19.910)
6.85
10
OFF
ON
26.50
Outlet sensor
Cleaning roller
(ø 9.000)
Charge roller
(ø 9.000)
6.77
LED head
Drum roller
(ø 16.000)
Developing roller
(ø 14.000)
17.23
12.72
23.18
20.32
64.60
Single tray
Transfer roller
(ø 15.000)
Hopping roller
OFF
32.00
10
Tray printing
10
ON
OFF
Manual feed sensor
Manual printing
Feed roller
Paper sensor
Figure 2-3 Layout Drawing of Electro-Photographic Processor
2 - 9
(3) Pulse motor (Main)
This pulse motor of 48 steps/rotation is two-phase excited by the signal from the main control
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, resist gear, drum gear, hopping roller is shown in the table
below and on the subsequent pages.
Main Motor Electromagnetic Clutch
Normal rotation
Reverse rotation
OFF
ON
OFF
Hopping Roller
Non-rotation
Rotation
Non-rotation
Regist Gear Drum Gear Operation
Non-rotation
Rotation
Rotation
Rotation
Rotation
Rotation
(4) LED head
The shift and latch registers receive image data from the main control board for each dot line.
4,992 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
from the main control board to heat the heat roller. The main control board monitors the heat
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.
Warm-up
Hopping
Prinitng
2 - 10
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
2
Roller to be driven by reverse
rotation of pulse motor (Main)
1
Motor to be driven by normal
rotation of pulse motor (main)
Roller control by pulse motor (main)
1
Normal rotation of pulse motor (main): Drum roller, transfer roller, cleaning roller, CH roller, developing roller, heat roller, exit roller rotation
2
Reverse rotation of pulse motor (main): 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 OKIPAGE8p/8w Paper Feeding
2 - 11
2.5 Electro-Photographic Process
(1) Electro-photographic process
The electro-photographic process is outlined below.
1 Charging
The surface of the OPC drum is charged negatively and uniformly by applying the DC
voltage to the CH roller.
2 Exposure
Light emitted from the LED head irradiates the negatively charged surface of the OPC
drum. The surface potential of the irradiated surface attenuates to form the electrostatic
latent image corresponding to the image signal.
3 Development and residual toner recovery
The negatively charged toner is brought into contact with the OPC drum, adhering to the
electrostatic latent image on the OPC drum by static electricity. This adhesion causes
the electrostatic latent image to change to a visible image.
At the same time, the residual toner on the OPC drum is attracted to the developing
rollerby static electricity.
4 Transfer
When paper is placed over the image drum surface, the positive charge which is
opposite in polarity to that of the toner, is applied to the reverse side by the transfer roller.
The toner is attracted by the positive charge and is transferred onto the paper. This
results in the transfer of the toner image formed on the image drum onto the paper.
5 Cleaning
The cleaning roller temporarily attracts the residual toner on the transferred OPC drum
with static electricity, then returns the toner to the OPC drum.
6 Fusing
The transferred unfused toner image is fused to a sheet of paper by applying heat and
pressure to the image.
Figure 2-5 is a flow for the electro-photographic process.
2 - 12
Paper
holder
section
Manual feed
Control signal
LED head
Power
supply
Exposure
Toner
cartridge
roller
Developing
Paper
supply
Transfer
Manual feed
roller
Hopping
Feed roller
Paper sensor
Transfer roller
sensor
: OPC drum rotation direction
: Paper feeding path
Power
supply
roller
Charge
Paper delivery
Charging
Power
supply
Cleaning Development
roller
Cleaning
Paper feeding
Outlet sensor
roller
Paper eject
Fusing
Power
supply
roller
Back-up
Heat roller
Figure 2-5 Flow for Electro-Photographic Process
Paper ejection Fusing Cleaning Transfer Development Paper feed Paper hopping
2 - 13
2.5.1 Explanation of Each Process Operation
(1) Hopping
As shown in the figure below, the clutch for hopping is turned on/off according to current ON/
OFF to a coil.
When the clutch is OFF
Coil
Hopping gear
Spring for resetting
Clutch plate
Magnetic
substance plate
Pin
Hopping roller
When the clutch is ON
Hopping shaft
Hopping gear
Engagement section
Clutch plate
When the clutch is on, the hopping gear engages with the clutch plate to rotate the hopping
roller.
When the clutch is off, the hopping gear is separated from the clutch plate by the spring for
resetting, disabling the rotation of the hopping roller.
2 - 14
(2) Printing and warm-up
At warm-up
Regist gear
Hopping gear
Triple gear
Transfer gear
Idle gear
Planetary gear
a"
a'
a
Gear A
Pulse motor (main)
Rotate the pulse motor (main) in the a direction. The planetary gear rotates in the a’ direction,
dislocating its position in the a” direction. This causes the planetary gear to be separated from
gear A. The hopping gear will not rotate. The triple gear and transfer gear rotate via the idle
gear to drive the EP unit.
At printing
Triple gear
Transfer gear
Regist gear
Idle gear
Planetary gear
b"
b'
b
Hopping gear
Gear A
Pulse motor (main)
The paper is further advanced in synchronization to the print data.
2 - 15
(3) Charging
Charging is performed by applying DC voltage to the charge roller that is in contact with the
surface of the OPC drum.
High-
voltage
power
supply
Charge roller
OPC drum
(4) Exposure
High-
voltage
power
supply
Light emitted from the LED head irradiates the negatively charged surface of the OPC drum.
The surface potential of the irradiated surface attenuates to form the electrostatic latent
image corresponding to the image signal.
LED head
Charge roller
LED head
OPC drum
2 - 16
Paper
Image drum
(5) Development
The electrostatic latent image on the surface of the OPC drum is changed to a visible toner
image by applying a toner to it. Development is performed in the contact part between the
OPC drum and developing roller.
1 The sponge roller negatively charges a toner and applies it to the developing roller.
Developing blade
Charge roller
Developing roller
OPC drum
Sponge roller
2 The toner applied to the developing roller is thin-coated by the developing blade.
3 A toner adheres to the exposure part of the OPC drum in the contact part between the
OPC drum and developing roller. This causes the electrostatic latent image to be
changed to a visible image.
2 - 17
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