Okidata OKIPAGE 8z, OKIPAGE 8w Lite MAINTENANCE MANUAL
OKIPAGE
8w Lite
(OEL)
OKIPAGE
8z
(ODA/INT)
LED Page Printer
Maintenance Manual
OEL/ODA/INT
2000-09-18 Rev.1
41701301TH Rev.1 1 / 104
Document Revision History
Rev.No. Date
No.
Corrected items
Page Description of change
Person in
charge
1 2000-09-18 ISSUE CNT K.Yamamoto
41701301TH Rev.1 2 /
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.
41701301TH Rev.1 3 /
CONTENTS
1. CONFIGURATION ......................................................................................... 6
1.1 System Configuration ............................................................................... 6
1.2 Printer Configuration................................................................................. 7
1.3 Specification ............................................................................................. 8
1.4 Safety Standards ...................................................................................... 10
1.4.1 Certification Label............................................................................................... 10
1.4.2 Warning Label .................................................................................................... 10
2. OPERATION DESCRIPTION......................................................................... 11
2.1 Main Control Board................................................................................... 12
2.2 Power Supply Unit .................................................................................... 13
2.3 High-Voltage Power Supply Board ........................................................... 13
2.4 Electro-Photographic Processor............................................................... 15
2.5 Electro-Photographic Process .................................................................. 18
2.5.1 Explanation of Each Process Operation............................................................. 20
2.6 Paper Jam Detection ................................................................................ 25
2.7 Toner Low Detection................................................................................. 27
2.8 Cover Open .............................................................................................. 28
2.9 Detecting I/D Unit existence ..................................................................... 28
3. PARTS REPLACEMENT ............................................................................... 31
3.1 Precautions for Parts Replacement.......................................................... 31
3.2 Parts Layout.............................................................................................. 33
3.3 Replacing Parts ........................................................................................ 36
3.3.1 Hopper Plate....................................................................................................... 36
3.3.2 LED Head and Head Spring ............................................................................... 37
3.3.3 Transfer Roller.................................................................................................... 38
3.3.4 How to remove Cover Upper Assy ..................................................................... 39
3.3.5 Upper Cover Assy .............................................................................................. 40
3.3.6 High-Voltage Power Supply Board (P3H)........................................................... 41
3.3.7 Top Cover Assy and Flat Cable Assy................................................................. 42
3.3.8 Paper Holder ...................................................................................................... 43
3.3.9 Side Plate M and Idle Gear ................................................................................ 44
3.3.10 Heat Assy ........................................................................................................... 45
3.3.11 Drive Shaft E (Eject) and Eject Roller................................................................. 46
3.3.12 Pressure Roller B (Back Up Roller).................................................................... 47
3.3.13 Separator Guide ................................................................................................. 48
3.3.14 Pulse Motor (Main) ............................................................................................. 50
3.3.15 Hopping Shaft Assy ............................................................................................ 51
3.3.16 Regist Roller ....................................................................................................... 52
3.3.17 Paper Sensor E, Paper Sensor Exit and Toner Sensor Assy............................. 53
3.3.18 Base Plate .......................................................................................................... 54
4. ADJUSTMENT ............................................................................................... 55
4.1 Adjustment Types and Functions ............................................................. 55
4.1.1 Printer Driver ...................................................................................................... 55
4.1.2 Engine Maintenance Utility................................................................................. 55
4.2 Adjustment When Replacing a Part.......................................................... 56
4.2.1 Setting LED Head Drive Time ............................................................................ 56
4.2.2 Uploading and Downloading EEPROM Data ..................................................... 57
41701301TH Rev.1 4 /
5. PERIODICAL MAINTENANCE58
5.1 Periodical Replacement Parts .................................................................. 58
5.2 Cleaning.................................................................................................... 58
5.2.1 Cleaning the LED Lens Array ............................................................................. 58
6. TROUBLESHOOTING PROCEDURES......................................................... 60
6.1 Troubleshooting Tips ................................................................................ 60
6.2 Check Points Before Correcting Image Problems .................................... 60
6.3 Notes When Correcting Image Problems ................................................. 60
6.4 Preparation Before Troubleshooting......................................................... 60
6.5 Troubleshooting........................................................................................ 61
6.5.1 Status Monitor Message List .............................................................................. 61
6.5.2 Status Message Troubleshooting....................................................................... 65
6.5.3 Image Troubleshooting....................................................................................... 71
7. WIRING DIAGRAM ....................................................................................... 80
7.1 Interconnect Signal Diagram .................................................................... 80
7.2 PCB Layout............................................................................................... 81
7.2.1 Main Control Board (U8S PCB).......................................................................... 81
7.2.2 High-Voltage Power Supply Board..................................................................... 82
8. PARTS LIST................................................................................................... 83
APPENDIX A LOCAL PRINTING/ DEMO PAGE PRINTING.............................. 90
APPENDIX B PARALLEL INTERFACE.............................................................. 91
APPENDIX C UNIVERSAL SERIAL BUS (USB) ................................................ 94
APPENDIX D MAINTENANCE UTILITY MANUAL............................................. 96
41701301TH Rev.1 5 /
1. CONFIGURATION
1.1 System Configuration
The OKIPAGE 8w Lite/8z 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
Figure 1-1
41701301TH Rev.1 6 /
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 (P3H)
Heat Assy
Main Control Board (U8S)
High-voltage Power
Supply Board (P6L)
Figure 1-2
41701301TH Rev.1 7 /
1.3 Specification
(1) Type Desktop
(2) Outside dimensions Height 6.72” (170 mm)
(excludes protruding Width 12.74” (324 mm)
portion) Depth 7.90” (207 mm)
(3) Weight 4.2 kg (with Image Drum Cartridge and Toner Cartridge)
(4) Development method Dry non-magnetic development system
Exposure method LED stationary head
(5) Paper <Type>
• Standard paper
– Xerox 4200 (20 lbs)
• Application paper (manual face-up feed)
– Label
– Envelope (24 to 28lb)
– OHP paper (Transparency)
<Size>
14" (355.6 mm) × 8.5" (215.9 mm) (Max.)
5" (127mm) × 3" (76.2mm) (Min.)
<Thickness>
– Automatic feed: 16 to 28 lbs (60 to 105 g/m
2
)
– 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)
(Without cleaning period of time at each
8th pages.)
Warm-up time: 35 seconds (at room temperature 77 ˚F
(25 ˚C))
(7) Paper feeding method Automatic paper feed or manual paper feed
(8) Paper delivery method Face up
(9) Resolution 300 × 300, 300 × 1,200 dpi
(10)Power input 120 VAC +55%, -15% (for ODA)
230 VAC ±10% (for OEL / ODA / INT)
(11)Power consumption Peak : Approx. 430W
Typical operation : Approx. 150W
Idle : Approx. 45W
Power save mode : Approx. 4.5W
41701301TH Rev.1 8 /
(12)Temperature and humidity
During operation
In storage
Caution:
Temperature and humidity in storage are measured with the OKIPAGE 8w Lite/
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
8z being packed; they are valid for one year.
(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)
41701301TH Rev.1 9 /
1.4 Safety Standards
1.4.1 Certification Label
The safety certification label is affixed to the following location of the OKIPAGE 8w Lite/8z.
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.
41701301TH Rev.1 10 /
2. OPERATION DESCRIPTION
The OKIPAGE 8w Lite/8z consists of a main control board, two high-voltage power supply board,
a power supply unit, and an electro-photographic processor. The OKIPAGE 8w Lite/8z receives
print data from a higher-level interface and sequentially stores it in memory. The OKIPAGE 8w
Lite/8z 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 electrophotographic 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 8w Lite/8z.
PLUNGER LED HEAD
Motor
M
Parallel
I/F
USB
I/F
CN3
CN6
HEADCN2
LVC
161284
ML60851
+5V+26V
CN7
CN1
0V5V
0VP0V
Motor Driver
MTD2007F
CPU
×
8/500S)
(n
(Address : 10)
OSC
16MHz
RST
DRAM Bus
(Data : 8)
EEPROM
4kb
Serial I/F
DRAM
2MB
HC244
CN5CN4
High Voltage Power Unit
Power Supply Unit
AC(120V/230V)
Heater
(Halogen Lamp)
Figure 2-1 Block Diagram
41701301TH Rev.1 11 /
P3H
High Voltage Power Unit
P6L
ID Unit
2.1 Main Control Board
The main control board consists of a one-chip CPU (include 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.
(1) One-chip CPU (include a program ROM)
The one-chip CPU is a custom CPU (16-bit internal bus, 16-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
Parallel interface controller
Video output port
LED STB output port
Timer
I/O port
A/D converter
Controls DRAM.
Transfers image data from Parallel I/F and USB 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.
Inputs the feedback signals from a high-voltage generation circuit and thermistor signal.
(2) Program ROM
Program ROM contains a program for the equipment. The program ROM is included in the
CPU.
For details PCB Layout see Section 7.2.1.
(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) USB interface
USB interface receives serial data from the host.
41701301TH Rev.1 12 /
2.2 Power Supply Unit
The power supply unit supplies +5V and +26V to the main control board according to 120VAC/
230VAC.
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 +5V according to the control sequence from the main
control board. When the cover is open, +5V 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.
Remarks
P3H-PCB
P3H-PCB
P3H-PCB
P6L-PCB
P3H-PCB
Caution:
The TR voltage varies with medium and transfer roller impedance.
41701301TH Rev.1 13 /
(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.
: Paper exists.
ON
: No paper exists.
OFF
: Paper exists.
ON
: No paper exists.
OFF
: Paper exists.
ON
: No paper exists.
OFF
ON (long)
OFF (short)
: Toner low
: Toner High
41701301TH Rev.1 14 /
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.
Charge roller
(ø 9.000)
6.77
Heat roller
(ø 19.910)
Cleaning roller
(ø 9.000)
6.85
Exit roller
Outlet sensor
Developing roller
Feed roller
Manual printing
Manual feed sensor
LED head
Drum roller
(ø 16.000)
(ø 14.000)
Paper sensor
10
ON
OFF
23.18
17.23
10
OFF
12.72
32.00
20.32
64.60
Hopping roller
26.50
Transfer roller
10
OFF
ON
Single tray
(ø 15.000)
Tray printing
Figure 2-3 Layout Drawing of Electro-Photographic Processor
41701301TH Rev.1 15 /
(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.
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
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
41701301TH Rev.1 16 /
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 OKIPAGE8w Lite/8z Paper Feeding
41701301TH Rev.1 17 /
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 roller
by 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.
41701301TH Rev.1 18 /
41701301TH Rev.1 19 /
Control signal
LED head
Power
supply
Paper delivery
Paper eject
roller
Outlet sensor
Paper ejection Fusing Cleaning Transfer Development Paper feed Paper hopping
Paper feeding
Heat roller
Fusing
Back-up
roller
Charge
roller
Power
supply
Cleaning
roller
Exposure
Charging
Cleaning Development
Transfer
Power
supply
Transfer roller
Paper sensor
Developing
Feed roller
Power
supply
roller
Paper
supply
Hopping
roller
: OPC drum rotation direction
Toner
cartridge
Paper
holder
Manual feed
section
Manual feed
sensor
Figure 2-5 Flow for Electro-Photographic Process
: Paper feeding path
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
Hopping roller
When the clutch is ON
Hopping shaft
Hopping gear
Hopping gear
Coil
Spring for resetting
Clutch plate
Magnetic
substance plate
Pin
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.
41701301TH Rev.1 20 /
(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.
41701301TH Rev.1 21 /
(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
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.
High-
voltage
power
supply
Charge roller
OPC drum
LED head
Paper
LED head
Image drum
41701301TH Rev.1 22 /
(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.
(6) Transfer
The transfer roller is composed of conductive sponge material. This roller is set so that the
surface of the OPC drum and sheets of paper will adhere closely.
A sheet of paper is placed on the surface of the OPC drum and the positive charge opposite
to the negative charge of a toner is applied from the reverse side by the transfer roller.
When a high negative voltage is applied from the power supply to the transfer roller, the
positive charge induced on the surface of the transfer roller moves to the paper side at the
contact part between the transfer roller and the sheet of paper. The positive charge on the
lower side of the sheet of paper then causes the negatively charged toner adhering to the
surface of the OPC drum to move to the upper side of the sheet. This enables transfer to the
sheet of paper.
OPC drum
Paper
Transfer roller
41701301TH Rev.1 23 /
High-voltage
power supply
g
(7) Fusing
The transferred unfused toner image is fused to a sheet of paper because heat and pressure
are applied when it passes between the heat roller and back-up roller.
The Teflon-coated heat roller contains a 400 W heater (Halogen lamp) that heats the heat
roller. The thermistor on the surface of the heat roller keeps the temperature of the heat roller
constant. A thermostat is also installed for safety. If temperature rises abnormally, this
thermostat opens to suspend voltage supply to the heater.
The back-up roller is pressurized to the heat roller by the pressure spring on each side.
Thermistor
Separation claw
Heater roller
Heater
Back-up roller
Pressure Sprin
(8) Cleaning
After transfer has terminated, the cleaning roller temporarily draws in the untransferred
residual toner adhering to the OPC drum with static electricity and then returns it to the OPC
drum.
Cleaning roller
OPC drum
High-voltage
power supply
Transfer roller
41701301TH Rev.1 24 /
2.6 Paper Jam Detection
The OKIPAGE 8w Lite/8z monitors the paper status when the power supply is on and during
printing. In the following cases, the OKIPAGE 8w Lite/8z interrupts the printing process as a paper
jam. Printing can be recovered by opening the cover, removing the jammed paper, and closing
the cover.
Error
Cause of Error
Paper inlet jam ••Only the manual feed sensor detects "Paper exists" when the power supply is on.
The leading part of the paper does not reach the paper sensor although hopping
operation was performed three time.
Paper feed jam • The leading part of the paper does not reach the outlet sensor within a fixed time after it
has passed the paper sensor.
Paper outlet jam • The trailing part of the paper does not pass the outlet sensor within L mm after the
leading part of the paper has passed the outlet sensor.
2.52" (64 mm) L 15.77" (400.6 mm)
<=<
=
Paper size error • The trailing part of the paper does not pass the paper sensor within L mm after the
leading part of the paper has passed the paper sensor.
2.52" (64 mm) L 15.77" (400.6 mm)
<=<
=
Paper Feed Check List
Type of Error
Supervisory Sensor
Reference Value
Error
Pluse Minus
Paper feed error
Paper feed jam1
Paper size error
Paper outlet jam
Paper feed jam 2
Electromagnetic clutch ON/
Paper sensor ON
Paper sensor ON/
Outlet sensor ON
Paper sensor ON/
Paper sensor OFF
Outlet sensor ON/
Outlet sensor OFF
Paper end sensor OFF/
Outlet sensor OFF
69.8
122.9
2.52" (64 mm) L
<=<
=
15.77" (400.56 mm)
2.52" (64 mm) L
<=<
=
15.77" (400.56 mm)
121.9
35
20.0
—
45.0
20.0
—
—
—
45.0
20.0
Unit: mm
41701301TH Rev.1 25 /
Pulse motor
(main)
Normal
rotation
OFF
Reverse
rotation
Electromagnetic
clutch
Manual feed
sensor
Paper sensor
Outlet sensor
Operation mode
OFF
ON
OFF
ON
OFF
ON
OFF
ON
Warm-up Paper feed Printing
Timing Chart for Paper Feed (Tray Feed)
41701301TH Rev.1 26 /
2.7 Toner Low Detection
Basic rotation cycle of toner sensor
T time
2.5 sec.
t1 > 0.64 sec.
0.64 sec. > t1 > 0.28 sec.
Toner low time
Toner full time
• Hardware configuration of toner sensor
The figure below shows the hardware configuration of the toner sensor.
Hardware Configuration of Toner Sensor
Image drum unit
Agitation bar (iron)
Magnet
Toner sensor lever
• Toner detection method
(1) Toner sensor monitoring conditions are shown in the figure below.
Toner sensor
Magnet draw-in
t1
T
Caution:
The toner sensor is not monitored when the drum is inactive.
(a) When the toner-low state continues twice, Toner Low occurs. (This state is monitored
at a cycle of 40 milliseconds.)
(b) When the toner-full state continues twice, Toner Low is released. (This state is
monitored at a cycle of 40 milliseconds.)
(c) When the toner sensor does not change over two cycles (T × 2), the toner sensor alarm
state occurs.
(d) After the EP unit has been replaced (after the drum counter has been reset), Toner
Low is not detected when the drum counter indicates 1 to 100 counts.
(2) The basic rotation cycle of the toner sensor is as follows:
41701301TH Rev.1 27 /
2.8 Cover Open
Opening the stacker cover turns off the microswitch on the high-voltage power supply board to
suspend +5V supply to the high voltage power supply. This results in the stop of all high-voltage
outputs. At the same time, the CVOPN signal is issued to notify the main control board of the switch
status and cover open processing is executed.
2.9 Detecting I/D Unit existence
In this model, a micro switch may be activated, applying a high voltage to the machine under a
state where the cover is slightly opened. In this case, there is a fear that, when a user insert his
hand through the opening, he may be shocked unless an I/D Unit has been installed. (Safety
standard measures EN60950 : 1992)
Therefore, with mechanism, an interlock system for micro switch shall be added if a machine has
no mechanism with I/D Unit inside. Also, for control, I/D Unit existence detection shall be
implemented according to the following method.
<Conditions for judging I/D Unit existence>
If a toner sensor does not change for 1.2 cycle of toner sensor basic rotation cycle soon after
powering on or closing cover, no installed I/D Unit shall be judged, stopping Warming Up motion
to shift the machine mode to light malfunction. But this error can be recovered by cover open and
close operation after installing I/D Unit.
T time Remarks
I/D Unit existence detection time
3.04 sec. As the toner sensor monitors at intervals of 40 msec.
the fractional part should be rounded down.
The conditions for enabling this error should be as follows.
Valid condition In the case of 31 pages or more in total drum counter
Invalid condition
In the case of 30 pages or less in total drum counter, a significant malfunction
toner sensor error shall occur.
But when the toner sensor breaks down with 31 or more counted in total at the drum, I/D Unit not
Install will be displayed without fail at power on. Even in this case, the machine should be in
printable state so that printing can be guaranteed until the completion of toner repair. (See the
drawing in the next page)
41701301TH Rev.1 28 /
POWER ON
Abnormal toner sensor
waveform
Other cases
I/D Unit not Installed
displayed/informed
Cover open/close
Status_A Status_B
Abnormal toner sensor waveform
Abnormal toner sensor waveform
Normal Normal
Cover open/close
Cover open/close
Normal toner sensor waveform
Normal printing
Toner Sensor Error
displayed/informed
Abnormal toner sensor waveform
ON LINE
Normal printing
OKIPAGE 8w Lite/8z I/D Unit not Installed / Toner Sensor Error
Draft for specification
1. Toner sensor error/I/D Unit not Installed state should not be stored in the EEPROM.
2. A shift to I/D Unit not Installed and Toner Sensor Error shall be made at cover open or close.
41701301TH Rev.1 29 /
Manual
Light
Medium-
Light
Medium
Medium-
Heavy
Heavy OHP Light
Medium-
Light
Medium
Medium-
Heavy
Heavy OHP
Media Type
TrayFeeding Tray
Paper size Excutive
Letter
Legal 14
Legal 13
A4
JIS B5
A5
A6
Monarch
COM-10
DL
C5
COM-9
Domestic postcard
and envelop equivalent
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
6
6
6
8
8
8
8
8
8
8
8
8
Note1
An envelop will be forcefully set to 6 PPM for manual feeding, narrow
in width, thick paper regardless of feeding tray and media type.
Domestic postcard and envelop equivalent will be forcefully set to
manual. (An inquiry to own country is required)
An envelop will be forcefully set to 6 PPM for manual feeding, narrow
in width, thick paper regardless of feeding tray and media type.
(unit:PPM)
ing data,
OKIPAGE 8w Lite/8z printing speed
it shall be printed in OHP mode.
Note) Tray + OHP. In the driver, OHP setting shall not be able to be selected on GUI for media type in tray. In the case of send
41701301TH Rev.1 30 /
Loading...