Oki OKIPAGE 12i Series User manual

40718301TH Rev.6 1 / 210
OKIPAGE12i
LED Page Printer
Maintenance Manual
Rev.6 2000-03-27
ODA / OEL / INT

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CONTENTS
1. CONFIGURATION.................................................................................................. 5
1.1 System Configuration ..................................................................................... 5
1.2 Printer Configuration....................................................................................... 7
1.3 Optional Configuration.................................................................................... 8
1.4 Specification ................................................................................................... 11
1.5 Safety Standards ............................................................................................ 13
1.5.1 Certification Label................................................................................................... 13
1.5.2 Warning Label ........................................................................................................ 13
1.5.3 Warning/Caution Marking....................................................................................... 14
2. OPERATION DESCRIPTION ................................................................................. 15
2.1 Main Control Board......................................................................................... 17
2.2 Power Supply/Sensor Board........................................................................... 18
2.3 Electrophotographic Process.......................................................................... 20
2.3.1 Electrophotographic Process Mechanism .............................................................. 20
2.3.2 Electrophotographic Process ................................................................................. 23
2.3.3 Process Operation Descriptions............................................................................. 26
2.3.4 Revision of LED Head Illumination36
2.4 Paper Jam Detection ...................................................................................... 40
2.5 Cover Open .................................................................................................... 42
2.6 Toner Low Detection....................................................................................... 43
3. PARTS REPLACEMENT........................................................................................ 45
3.1 Precautions for Parts Replacement................................................................ 45
3.2 Parts Layout.................................................................................................... 47
3.3 How to Change Parts...................................................................................... 50
3.3.1 Upper Cover Assy .................................................................................................. 51
3.3.2 LED Head............................................................................................................... 52
3.3.3 Operator Panel Assy .............................................................................................. 53
3.3.4 Lower Base Unit ..................................................................................................... 54
3.3.5 Pulse Motor (Main/Drum) ....................................................................................... 55
3.3.6 Pulse Motor (Registration)...................................................................................... 56
3.3.7 Face Up Stacker Assy............................................................................................ 57
3.3.8 Eject Roller Assy .................................................................................................... 58
3.3.9 Motor Assy ............................................................................................................. 59
3.3.10 Hopping Roller Shaft Assy ..................................................................................... 60
3.3.11 Stacker Cover Assy................................................................................................ 61
3.3.12 Registration Roller.................................................................................................. 62
3.3.13 Roller Transfer Assy............................................................................................... 63
3.3.14 Fusing Unit ............................................................................................................. 64
3.3.15 Back-up Roller........................................................................................................ 65
3.3.16 Sensor Plate (Inlet)................................................................................................. 66
3.3.17 Sensor Plate (Outlet).............................................................................................. 67
3.3.18 Manual Feed Guide Assy ....................................................................................... 68
3.3.19 Sensor Plate (Paper Supply).................................................................................. 69
3.3.20 M5E-PCB ............................................................................................................... 70
3.3.21 Transformer............................................................................................................ 71
3.3.22 Power Supply/Sensor Board and Contact Assy ..................................................... 72
3.3.23 Cassette Guide L Assy........................................................................................... 73
3.3.24 Cassette Guide R Assy .......................................................................................... 74
3.3.25 Spacer Bearing (L/R).............................................................................................. 75

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4. ADJUSTMENT........................................................................................................ 76
4.1 Maintenance Modes and Functions................................................................ 76
4.1.1 User Maintenance Mode ........................................................................................ 76
4.1.2 System Maintenance Mode.................................................................................... 76
4.1.3 Engine Maintenance Mode..................................................................................... 77
4.1.4 EEPROM initialization ............................................................................................ 78
4.2 Adjustment When Replacing a Part................................................................ 79
4.2.1 Setting of LED Head Drive Time ............................................................................ 79
4.2.2 Uploading/Downloading EEPROM data................................................................. 82
5. PERIODICAL MAINTENANCE .............................................................................. 83
5.1 Periodical Replacement Parts ........................................................................ 83
5.2 Cleaning.......................................................................................................... 83
5.2.1 Cleaning of LED Lens Array................................................................................... 83
5.2.2 Cleaning Page Function ......................................................................................... 85
6. TROUBLESHOOTING PROCEDURES ................................................................. 86
6.1 Troubleshooting Tips ...................................................................................... 86
6.2 Points to Check before Correcting Image Problems....................................... 86
6.3 Tips for Correcting Image Problems............................................................... 86
6.4 Preparation for Troubleshooting ..................................................................... 87
6.5 Troubleshooting Flow ..................................................................................... 88
6.5.1 LCD Status Message/Problem List ........................................................................ 88
6.5.2 LCD Message Troubleshooting.............................................................................. 99
6.5.3 Image Troubleshooting........................................................................................... 108
7. WIRING DIAGRAM................................................................................................ 119
7.1 Interconnect Signal Diagram .......................................................................... 119
7.2 PCB Layout and Connector Signal List .......................................................... 120
7.3 Resistance Check........................................................................................... 129
7.4 Short Plug Setting........................................................................................... 131
8. PARTS LIST ........................................................................................................... 132
APPENDIX A RS-232C SERIAL INTERFACE (OPTION) ......................................... 139
APPENDIX B CENTRONICS PARALLEL INTERFACE............................................ 144
APPENDIX C LOOP TEST (RS-232C INTERFACE) ................................................. 150
APPENDIX D DIAGNOSTICS TEST .......................................................................... 151
APPENDIX E MULTI PURPOSE FEEDER MAINTENANCE..................................... 159
1. OUTLINE ........................................................................................................ 159
1.1 Functions................................................................................................................ 159
1.2 External View and Component Names .................................................................. 159
2. MECHANISM DESCRIPTION ........................................................................ 160
2.1 General Mechanism ............................................................................................... 160
2.2 Hopper Mechanism ................................................................................................ 160
3. PARTS REPLACEMENT................................................................................ 161
3.1 Precautions Concerning Parts Replacement ......................................................... 161
3.2 Parts Layout ........................................................................................................... 163

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3.3 Parts Replacement Method164
3.3.1 Link ......................................................................................................... 165
3.3.2 Separator................................................................................................ 166
3.3.3 OLEV-11-PCB ........................................................................................ 167
3.3.4 Pulse Motor ............................................................................................ 168
3.3.5 Planet Gear ............................................................................................ 169
3.3.6 Roller-A and B ........................................................................................ 170
4. TROUBLESHOOTING.................................................................................... 171
4.1 Precautions Prior to the Troubleshooting ............................................................... 171
4.2 Preparations for the Troubleshooting ..................................................................... 171
4.3 Troubleshooting Method......................................................................................... 172
4.3.1 LCD Status Message List ....................................................................... 172
5. CONNECTION DIAGRAM.............................................................................. 174
5.1 Interconnection Diagram ........................................................................................ 174
5.2 PCB Layout ............................................................................................................ 175
6. PARTS LIST ................................................................................................... 176
APPENDIX F HIGH CAPACITY SECOND PAPER FEEDER.................................... 178
1. OUTLINE ........................................................................................................ 178
1.1 Functions................................................................................................................ 178
1.2 External View and Component Names .................................................................. 178
2. MECHANISM DESCRIPTION ........................................................................ 179
2.1 General Mechanism ............................................................................................... 179
2.2 Hopper Mechanism ................................................................................................ 179
3. PARTS REPLACEMENT................................................................................ 180
3.1 Precautions Concerning Parts Replacement ......................................................... 180
3.2 Parts Layout ........................................................................................................... 182
3.3 Parts Replacement Methods .................................................................................. 183
3.3.1 Stepping Motor (Hopping) ...................................................................... 184
3.3.2 TQSB-2 PCB .......................................................................................... 186
3.3.3 Hopping Roller Shaft Assy and One-way Clutch Gear ........................... 186
4. TROUBLESHOOTING.................................................................................... 187
4.1 Precautions Prior to the Troubleshooting ............................................................... 187
4.2 Preparations for the Troubleshooting ..................................................................... 187
4.3 Troubleshooting Method......................................................................................... 188
4.3.1 LCD Status Message List ....................................................................... 188
5. CONNECTION DIAGRAM.............................................................................. 190
5.1 Interconnection Diagram ........................................................................................ 190
5.2 PCB Layout ............................................................................................................ 191
6. PARTS LIST ................................................................................................... 192
APPENDIX G NETWORK INTERFACE (OPTION).................................................... 199

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1. CONFIGURATION
1.1 System Configuration
OKIPAGE 12i consists of control and engine blocks in the standard configuration, as shown in Figure
1-1.
In addition, the options marked with asterisk(*) are available.

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Figure 1-1
Power Supply
and Sensor Board
Electrophotographic
Processing Unit
Paper Feeding Mechanism
(First Tray Unit)
RS-232C Serial*
Interface Board
1 DRAM SIMM Socket
1 Flash SIMM Socket
Main Control Board
Operator Panel
Paper
Cassette
Face
Down
Stacker
Engine Unit
* : Optional
** : Optional (ODA/INT)
*High Capacity
Second Paper
Feeder
*Multi Purpose
Feeder
Centronics
Face Up
Stacker
or
Network**
Interface Board
1 DRAM SIMM Socket
1 Flash SIMM Socket
or Flash SIMM*
(Flash memory)
DRAM SIMM*
RS-232C
LAN
(10 BASE-T)
Memory*
Expansion Board
1 DRAM SIMM Socket
1 Flash SIMM Socket

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1.2 Printer Configuration
The printer unit consists of the following hardware components:
• Electrophotographic Processor
• Paper Feeder
• Controller
• Operator Panel
• Power Supply Unit
The printer unit configuration is shown in Figure 1-2.
Figure 1-2
Upper cover
Operator panel assy
Stacker assy
Optional board
Fusing unit
Power supply/sensor board
Main control board
Legal/universal paper cassette
Image drum unit(Type 5)
(consumable)
Toner-cartridge(Type 5)
(consumable)

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(3) 1MB Memory Expausion Board
1.3 Optional Configuration
Theoptionsshown below areavailableforuse with OKIPAGE12i. Theseareavailable separately from
the printer unit.
(1) High Capacity Second Paper Feeder
(2) Multi Purpose Feeder

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(5) Network Interface Board
(4) RS-232C Serial Interface Board
(6) DRAM SIMM Memory
DRAM SIMM memory is available with memory of 1MB (min.) to 32MB (max.). The access time of
SIMM memories are 60ns, 70ns, 80ns, and 100ns.

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(7) Flash memory SIMM

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1.4 Specification
(1) Type Desktop
(2) External dimensions Height 7.9” (200 mm)
Width 13.6” (345 mm)
Depth 15.7” (400 mm)
(3) Weight Approx. 10 kg
(4) Developing method Dry electrophotography
Exposing 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>
• Standard sizes
– Letter
– Legal* [* Without Multi Purpose Feeder (Option)]
– Legal-13*
– Executive
– COM-10** [** manual feed and Multi Purpose Feeder
– Monarch** (option) only]
– DL**
– C5**
– A4
– A5
– B5 (JIS)
– A6
• Applicable sizes
– Width: 3.87” to 8.5” (116 to 216 mm)
– Length: 5.83” to 14” (148 to 355.6 mm)
<Thickness>
– Automatic feed: 16 to 28 lbs (60 to 135 g/m2)
– Manual feed: Label, OHP paper (transparency)
Envelope (24 to 28 lbs)
(6) Printing speed Continuous printing: 12 pages per minute with Letter size
paper. [Except Second Paper Feeder
(8.8PPM), Multi purpose Feeder (8.3ppm)]
Warm-up time: 55 seconds typical at room temperature
[68˚F (20˚C), AC 120/230 V].
First page print time: 9 seconds typical for the Letter size
paper after warm-up.
(7) Paper feeding method Automatic feed or manual feed

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(8) Paper delivery method Face down/face up
(9) Resolution 600 ×600 dots/inch
600 ×1200 dots/inch
(10) Power input 120 VAC + 5.5%, -15%
230 VAC ±10%
120VAC 230VAC
(11)Power consumption Peak: Approx. 515W Approx. 520W
Typical operation: Approx. 231W Approx. 250W
Idle: Approx. 65W Approx. 56W
Power save mode: Approx. 14W Approx. 14W
(12)Temperature and humidity
1. Storage conditions specified above apply to printers in packed condition.
2. Temperature and humidity must be in the range where no condensation occurs.
(13) Noise During operation: 50 dB (A) or less
Standby: 38 dB (A) or less
Quiet mode: Back ground level
(14) Consumables Toner cartridge kit 2,000 (5% duty)
Image drum cartridge 20,000 (at continuouts printing)
14,000 (3 page/job) without Power Save
In operation Power off mode During Storage Unit
Temperature
Humidity
Maximum wet bulb
temperature
Minimum diference
between wet and dry
bulb temperatures
50-90
(10-32)
20-80
77
(25)
35.6
(2)
°F
(°C)
%RH
°F
(°C)
°F
(°C)
32-110
(0-43)
10-90
80.4
(26.8)
35.6
(2)
14-110
(–10-43)
10-90

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1.5 Safety Standards
1.5.1 Certification Label
The safety certification label is affixed to the printer in the position described below.
1.5.2 Warning Label
The warning labels are affixed to the sections which may cause bodily injury.
Follow the instructions on warning labels during maintenance.
ODA AC : 120V model ODA AC : 230V model
INT AC : 230V model

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1.5.3 Warning/Caution Marking
The following warning and caution markings are made on the power supply/sensor board.
ENGLISH
Heatsink and transformer core present risk of electric shock. Test before touching.
FRENCH
Le dissipateur thermique et le noyau du transformateur présentent des risques de choc électrique.
Testez avant de manipuler.
SPANISH
Las disipadores de color el núcel del transformador pueden producir un choque eléctrico. Compruebe
antes de tocar.
PORTUGUESE
Odissipadorde calor eonúcleodo fransiormador apresentamriscodechoque elétrico.Testeantesde
focar.
ENGLISH
Circuits maybe live after fuses open.
FRENCH
Il se peut que les circuits soient sous tension une fois que les fusibles ont éférerirés.
SPANISH
Las circuitos pueden estar activos una vez que se hayan abierio los fusibles.
PORTUGUESE
Os circuitos podem estar energizados após os fusiveis se queimarem.
F3
* No fuse is mounted here for 200V series
*
WARNING
CAUTION
ATTENTION ATENCÃO
CUIDADO CUIDÃDO
AVERTISSEMENT
ADVERTENCIA
HEATSINK AND TRANSFORMER
PRESENT RISK OF ELECTRIC SHOCK
TEST BEFORE TOUCHING

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2. OPERATION DESCRIPTION
OKIPAGE 12i consists of a main control board, a power supply/sensor board, an operator panel, an
electrophotographic process mechanism, and revision for illumination of LED head.
The main control board receives data via the host I/F, it then decodes, edits and stores the data in
memory. After completing the editing of a single page of data, it references the font memory and
generates bit image data, which is transferred to the LED head in one dot line units.
Through the electrophotographic process mechanism, the data is printed on the paper.
The operator panel is used for operations and status display.
OKIPAGE 12i block diagram is shown in Figure 2-1.

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Figure 2-1 OKIPAGE 12i Block Diagram
1MB Memory Board
(Option) RS232C Interface Board (Option) Network Interface Board (Option: ODA/INT)
or
Program & Font ROM
16MB Mask ROM
(8MB
× 2)
Resident RAM
2MB
× 2 DRAM
(4MB)
For optional board
Main Control Board
Power Supply
Board
or
DATA
BUS
(32bit)
EEPROM
74LS07
Inlet sensor 1
Inlet sensor 2
Paper sensor
Outlet sensor
Paper out sensor
Toner low sensor
Reset
circuit
Centronics
parallel I/F
1 Chip CPU
Drum motor &
Registration motor
drive circuit
FAN Driver FAN ALM
HEAT ON
Low voltage
generation circuit
LSI
AC
transformer
High voltage
generation
circuit
Charge roller
Transfer roller
Developping
roller
Toner supply
roller
Cleaning
roller
FAN
LED Head
M
M
Registration Motor
Drum Motor
High Capacity
Second Paper
Feeder (Option)
Multi-Purpose
Feeder (Option)
Operation Panel
+8V -8V 0V +5V+30V
Cover
open
switch
Fusing temperature
control circuit
Heater drive
circuit
Filter circuit AC IN
Heater
Thermistor

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2.1 Main Control Board
The main control board consists of a single chip CPU, two program/font ROMs, two DRAMs, an
EEPROM, a host interface circuit, and a mechanism driving circuit.
(1) Single chip CPU
The single chip CPU is a custom CPU (32-bit internal bus, 32-bit external bus, 40.55-MHz clock
(20.75MHz×2)whichincorporatestheRISCCPUanditsperipheraldevices,andhasthefollowing
functions:
(2) Program and Font ROMs
TheProgramand FontROMsstorethe equipmentprogramandvarious typesoffonts. MaskROM
isusedasProgramandFontROMs. ThemountinglocationsoftheseProgramandFontROMsvary
depending on the type of the ROMs (for the mounting location see Section 7.4).
(3) DRAM
TheDRAMisa4MBresidentmemoryonthemaincontrolboardthatstoresediteddata,imagedata,
DLL data and macro data.
(4) EEPROM
4,096-bit Electrically Erasable PROM (EEPROM), is loaded with the following kinds of data:
•Menu data
•Various counter data (page counter, drum counter)
•Adjusting parameters (LED head drive time, print start position, paper feed length)
(5) Parallel Interface
Parallel data is received from a host system via parallel interface which conforms to the IEEE1284
specification.
Built-in device Function
Chip select controller
Bus controller
DRAM controller
DMA controller
Parallel interface controller
Serial interface controller
Video output port
LED STB output port
Timer
Serial I/O port
I/O port
Control of ROM, DRAM and I/O device
Transfer of image data from DRAM to video output port
Control of Centronics parallel interface
Control of RS-232C serial interface
Control of LED head
Generation of various control timing
Monitoring of paper running and paper size
Control of operator panel, EEPROM, and options
Input and output of sensor and motor signals

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2.2 Power Supply/Sensor Board
Thepowersupply/sensor boardconsistsofan ACfiltercircuit,a lowvoltagepowersupply circuit,ahigh
voltage power supply circuit, heater drive circuit, and photosensors.
(1) Low Voltage Power Supply Circuit
This circuit generates the following voltages.
(2) High Voltage Power Supply Circuit
This circuit generates the following voltages required for electrophotographic process from +5V,
accordingtothecontrolsequencefromthemaincontrolboard. Whencoveropenstateisdetected,
+5V supply is interrupted automatically to stop the supply of all high-voltage outputs.
Output voltage Use
+5 V
+30 V
+8 V
–8 V
+3.3V
Logic circuit supply voltage
Motor and fan drive voltage and source voltage for high-voltage supply
RS-232C line voltage
RS-232C line voltage and PS board supply voltage
LED head supply voltage
(3) Photosensor
The photosensor mounted on this power supply/sensor board monitors the status of paper being
fed through the printer during printing.
Output Voltage Use Remarks
CH
DB
SB
TR
CB
Voltage applied to charging roller
Voltage applied to developing roller
Voltage applied to toner supply roller
Voltage applied to transfer roller
Voltage applied to clearing roller Variable
-1.3 KV
-265 V/+300 V
-500 V/ 0 V
+500 V to +3.5 KV/-1100 V
+400 V/-1350 V

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Figure 2-2
The sensor layout diagram is shown in Figure 2-2.
Outlet sensor
Exit roller
Heat roller
Transfer roller
Paper sensor
Registration roller
Inlet sensor 1
Inlet
sensor 2
Toner
sensor Paper end sensor
Hopping
roller
Paper feeding direction
Sensor Function Sensing state
Inlet sensor 1
Intel sensor 2
Paper sensor
Outlet sensor
Paper end sensor
Toner low sensor
Detects the leading part of the paper and gives the monitor timing
for switching from hopping operation to feeding operation.
Monitors paper feeding situation and paper size based on the
paper arrival time and running time.
Detects the paper width.
Detects the leading portion of the paper.
Monitors the paper feeding situation.
Monitors the paper feeding and size according to the time of
arrival to and leaving past the sensor.
Detects the end of the paper.
Detects the lack of toner.
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
- - - - -
: Paper exists.
: No paper exists.
: A4 or larger
: Smaller than A4
: Paper exists.
: No paper exists.
: Paper exists.
: No paper exists.
: Paper exists.
: No paper exists.

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2.3 Electrophotographic Process
2.3.1 Electrophotographic Process Mechanism
Thismechanismactuatesthe printing of imagedatasuppliedbythe main control boardonthepaperby
electrophotographic process.
The layout of the electrophotographic process mechanism is shown in Figure 2-3.