Oki OKIPAGE 8z How to use

OKIPAGE 8z
LED Page Printer
Service Handbook
Oki Data
2000.6.30

PREFACE
This Service Handbook describes the field maintenance procedures for the OKIPAGE 8z.
This manual is written for use by service persons. Please note that you should refer to the Printer
User's Manual for operating procedures.

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 - 3
2.2 Power Supply Unit ............................................................................. 2 - 5
2.3 High-Voltage Power Supply Board .................................................... 2 - 5
2.4 Electro-Photographic Processor........................................................ 2 - 7
2.5 Electro-Photographic Process ........................................................... 2 - 11
2.5.1 Explanation of Each Process Operation.................................................. 2 - 13
2.6 Paper Jam Detection ......................................................................... 2 - 19
2.7 Toner Low Detection.......................................................................... 2 - 21
2.8 Cover Open ....................................................................................... 2 - 22
2.9 Detecting ID existence....................................................................... 2 - 23
3. PARTS REPLACEMENT........................................................................... 3 - 1
3.1 Precautions for Parts Replacement................................................... 3 - 1
3.2 Parts Layout....................................................................................... 3 - 3
3.3 Replacing Parts ................................................................................. 3 - 7
3.3.1 Hopper Plate ........................................................................................... 3 - 7
3.3.2 LED Head and Head Spring.................................................................... 3 - 8
3.3.3 Transfer Roller.........................................................................................3 - 9
3.3.4 Upper Cover Assy ...................................................................................3 - 10
3.3.5 High-Voltage Power Supply Board (P2H/ P6L) ....................................... 3 - 11
3.3.6 Top Cover Assy and Flat Cable Assy...................................................... 3 - 12
3.3.7 Paper Holder ...........................................................................................3 - 13
3.3.8 Side Plate M and Idle Gear .....................................................................3 - 14
3.3.9 Heat Assy ................................................................................................ 3 - 15
3.3.10 Drive Shaft E (Eject) and Eject Roller ..................................................... 3 - 18
3.3.11 Pressure Roller B (Back Up Roller)......................................................... 3 - 19
3.3.12 Separator Guide ...................................................................................... 3 - 20
3.3.13 Pulse Motor (Main) .................................................................................. 3 - 23
3.3.14 Hopping Shaft Assy ................................................................................. 3 - 24
3.3.15 Resist Roller ............................................................................................ 3 - 25
3.3.16 Paper Sensor E, Paper Sensor Exit and Toner Sensor Assy ................. 3 - 26
3.3.17 Base Plate ............................................................................................... 3 - 27

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
7.1(b)Interconnect Signal Diagram (OKIPAGE 8z)................................7 - 2
7.2.1 Main Control board (NMA PCB)(OKIPAGE 8p) ...................................... 7 - 3
7.2.2Main Control board (NMA PCB)(OKIPAGE 8z)......................................7 - 4
7.2.3 High-Voltage Power Sapply Board .......................................................... 7 - 5
8. PARTS LIST .............................................................................................. 8 - 1
APPENDIX A LOCAL PRINTING.............................................................. A - 1
APPENDIX B PARALLEL INTERFACE ................................................... B - 1
APPENDIX C MAINTENANCE UTILITY....................................................C - 1
APPENDIX D USB INTERFACE ...............................................................D - 1

1. CONFIGURATION

1 - 1
Electro-photographic
Processor
Paper Feed Mechanism
ENGINE UNIT
Hopper
Plate
Main High-Voltage
Power Supply Board
Sub High-Voltage
PowerSupply Board
Power Supply Unit
Main Control Board
,
,
4MB Memory
Expansion Board
Figure 1-1
1. CONFIGURATION
1.1 System Configuration
TheOKIPAGE8zconsists ofa controlblock,a powersupplyunit, andan engineblock. (See
Figure 1-1.)

1 - 2
EP Unit (Type 6)
Upper Cover Assy
Top Cover Assy
Heat Assy
Main Control Board
High-voltage Power
Supply Board (P6L)
High-voltage Power
Supply Board (P2H)
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.

1 - 3
1.3 Option
(1) 4MB Option Memory Board

1 - 4
1.4 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 105 g/m2)
– Manual feed: Label,Envelope,OHPpaper(transpar-
ency)
(6)Printing speedFirst print:13 seconds (A4) (after warm-up)
Continuous print: 4 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 down
(9)Resolution300 x 300, 300 x 1200 dpi
(10) Power input 230 VAC ±10% (for OEL/INT)
120 VAC +6%, -15% (for ODA)
(11) Power consumption Peak: Approx. 450W
Typical operation: Approx. 100W
Idle: Approx. 30W
Power save mode: Approx. 5W

1 - 5
(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
Caution: Temperature and humidity in storage are measured with the OKIPAGE 8z
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 1,500 (5% duty) ........ 45g cartridge kit
Image drum cartridge10,000 (at continuouts printing)

1 - 6
1.5 Safety Standards
1.5.1 Certification Label
The safety certification label is affixed to the following location of the OKIPAGE 8z:
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
For OEL, OKI-INT
For China, TAIWANFor Korea

2. OPERATION DESCRIPTION

2 - 1
2. OPERATION DESCRIPTION
The OKIPAGE 8zconsists of a main control board, a high-voltage power supply board, a
power supply unit, and an electro-photographic processor. The OKIPAGE 8zreceives print
data from a higher-level interface and sequentially stores it in memory. The OKIPAGE 8z
decodes and edits the received data while storing print data from the interface in memory. It
sequentiallytransferstheediteddatatotheLEDheadforeachdotline. Theelectro-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 8z.

2 - 2
Figure 2-1 Block Diagram (OKIPAGE 8z)
PLUNGER LED HEAD
Main Motor
PJ HEAD1HEAD2
5V 0V
0V
MOTOR
Motor Driver
MTD2005F EEPROM 1kb
CPU
(NKK 3 or 5) Serial i/f
Data Bus
(x 16)
Address Bus
CENT
LS07
+26V+5V0V0VP
POWER HIVOL HIVOL2
HC244
LSI
LC26023A
RST
OSC
7MHz
OSC
10MHz
OPTION
DRAM
2MB
Power Supply Unit High Voltage Power Unit
(Main) High Voltage Power Unit (Sub)
Parallel
i/f
Red
Amber
Amber
DRAM
1M x 16
RAM BOARD
(N4A PCB)
DRAM 4MB
OPTION BOARD

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
hostinterface circuit,and amechanism drivingcircuit. The mechanism drivingcircuit consistsof
a LED head, a main motor, and an electromagnetic clutch.
(1)One-chip CPU
• OKIPAGE 8z
The one-chip CPU is a custom CPU (8-bit internal bus, 8-bit external bus, 16-MHz clock)
incorporatingmask ROM and CPU peripheraldevices. This CPU has the functionslisted 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 - 4
(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 - 5
Used to generate a logic circuit and a high voltage.
Used to drive the motor and electromagnetic clutch.
Output voltage Application
+5 V
+26V
Output Application
CH
DB
SB
CB
TR
Voltage
–1.3 KV
–265 V/+265 V
–520 V/ 0 V
+400 V/–1.3 KV
+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.
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.
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.
Caution: The TR voltage varies with medium and transfer roller impedance.

2 - 6
Figure 2-2
(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 High
Exit roller
Outlet sensor
Heat roller
Transfer roller
Feed roller
Toner
sensor
assy Manual feed sensor
Paper sensor
Hopping
roller
Paper feeding direction

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
Theimagedrumunitmakesatoneradheretotheformedelectrostaticlatentimagewithstatic
electricity. Thiselectrostatic latent imageis formed bythe lights irradiatedfrom LEDheads.
(2) Electromagnetic clutch
The electromagnetic clutch controls the rotation of the hopping roller according to signals
from the control block.

2 - 8
Figure 2-3 Layout Drawing of Electro-Photographic Processor
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