OKI PAGE 10ex Service manual

OKIPAGE 10ex
LED Page Printer

Maintenance Manual

ODA / OEL / INT

Rev.5 99. 11. 30

40718401TH Rev.5 1 / 197

CONTENTS

1. CONFIGURATION.................................................................................................. 5

1.1 System Configuration ..................................................................................... 5

1.2 Printer Configuration....................................................................................... 7

1.3 Optional Configuration .................................................................................... 8

1.4 Specification ................................................................................................... 10

1.5 Safety Standards ............................................................................................ 12

1.5.1 Certification Label................................................................................................... 12

1.5.2 Warning Label ........................................................................................................ 12

1.5.3 Warning/Caution Marking ....................................................................................... 13

2. OPERATION DESCRIPTION ................................................................................. 14

2.1 Main Control Board......................................................................................... 16

2.2 Power Supply/Sensor Board........................................................................... 17

2.3 Electrophotographic Process.......................................................................... 19

2.3.1 Electrophotographic Process Mechanism .............................................................. 19

2.3.2 Electrophotographic Process ................................................................................. 22

2.3.3 Process Operation Descriptions............................................................................. 25

2.3.4 Revision of LED Head Illumination ......................................................................... 35

2.4 Paper Jam Detection ...................................................................................... 39

2.5 Cover Open .................................................................................................... 41

2.6 Toner Low Detection....................................................................................... 42

3. PARTS REPLACEMENT........................................................................................ 44

3.1 Precautions for Parts Replacement................................................................ 44

3.2 Parts Layout.................................................................................................... 46

3.3 How to Change Parts...................................................................................... 49

3.3.1 Upper Cover Assy .................................................................................................. 50

3.3.2 IC Card Cover ........................................................................................................ 51

3.3.3 LED Head............................................................................................................... 52

3.3.4 Operator Panel Assy .............................................................................................. 53

3.3.5 Lower Base Unit ..................................................................................................... 54

3.3.6 Pulse Motor (Main/Drum) ....................................................................................... 55

3.3.7 Pulse Motor (Registration)...................................................................................... 56

3.3.8 Face Up Stacker Assy............................................................................................ 57

3.3.9 Eject Roller Assy .................................................................................................... 58

3.3.10 Motor Assy ............................................................................................................. 59

3.3.11 Hopping Roller Shaft Assy ..................................................................................... 60

3.3.12 Stacker Cover Assy ................................................................................................ 61

3.3.13 Registration Roller .................................................................................................. 62

3.3.14 Roller Transfer Assy............................................................................................... 63

3.3.15 Fusing Unit ............................................................................................................. 64

3.3.16 Back-up Roller........................................................................................................ 65

3.3.17 Sensor Plate (Inlet)................................................................................................. 66

3.3.18 Sensor Plate (Outlet) .............................................................................................. 67

3.3.19 Manual Feed Guide Assy ....................................................................................... 68

3.3.20 Sensor Plate (Paper Supply) .................................................................................. 69

3.3.21 M5B-PCB ............................................................................................................... 70

3.3.22 Transformer............................................................................................................ 71

3.3.23 Power Supply/Sensor Board and Contact Assy ..................................................... 72

3.3.24 Cassette Guide L Assy ........................................................................................... 73

3.3.25 Cassette Guide R Assy .......................................................................................... 74

3.3.26 Spacer Bearing (L/R).............................................................................................. 75

40718401TH Rev.5 2 /

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 .............................................................................. 98

6.5.3 Image Troubleshooting........................................................................................... 107

7. WIRING DIAGRAM................................................................................................ 118

7.1 Interconnect Signal Diagram .......................................................................... 118

7.2 PCB Layout and Connector Signal List .......................................................... 119

7.3 Resistance Check........................................................................................... 128

7.4 Short Plug Setting........................................................................................... 130

8. PARTS LIST ........................................................................................................... 131

APPENDIX A RS-232C SERIAL INTERFACE (OPTION) ......................................... 138

APPENDIX B CENTRONICS PARALLEL INTERFACE............................................ 143

APPENDIX C LOOP TEST (RS-232C INTERFACE) ................................................. 149

APPENDIX D DIAGNOSTICS TEST .......................................................................... 150

APPENDIX E MULTI PURPOSE FEEDER MAINTENANCE..................................... 158

1. OUTLINE ........................................................................................................ 158

1.1 Functions ................................................................................................................ 158

1.2 External View and Component Names .................................................................. 158

2. MECHANISM DESCRIPTION ........................................................................ 159

2.1 General Mechanism ............................................................................................... 159

2.2 Hopper Mechanism ................................................................................................ 159

3. PARTS REPLACEMENT................................................................................ 160

3.1 Precautions Concerning Parts Replacement ......................................................... 160

3.2 Parts Layout ........................................................................................................... 162

40718401TH Rev.5 3 /

3.3 Parts Replacement Methods .................................................................................. 163

3.3.1 Link ......................................................................................................... 164

3.3.2 Separator................................................................................................ 165

3.3.3 OLEV-11-PCB ........................................................................................ 166

3.3.4 Pulse Motor ............................................................................................ 167

3.3.5 Planet Gear ............................................................................................ 168

3.3.6 Roller-A and B ........................................................................................ 169

4. TROUBLESHOOTING.................................................................................... 170

4.1 Precautions Prior to the Troubleshooting ............................................................... 170

4.2 Preparations for the Troubleshooting ..................................................................... 170

4.3 Troubleshooting Method......................................................................................... 171

4.3.1 LCD Status Message List ....................................................................... 171

5. CONNECTION DIAGRAM.............................................................................. 173

5.1 Interconnection Diagram ........................................................................................ 173

5.2 PCB Layout ............................................................................................................ 174

6. PARTS LIST ................................................................................................... 175

APPENDIX F HIGH CAPACITY SECOND PAPER FEEDER.................................... 176

1. OUTLINE ........................................................................................................ 176

1.1 Functions ................................................................................................................ 176

1.2 External View and Component Names .................................................................. 176

2. MECHANISM DESCRIPTION ........................................................................ 177

2.1 General Mechanism ............................................................................................... 177

2.2 Hopper Mechanism ................................................................................................ 177

3. PARTS REPLACEMENT................................................................................ 178

3.1 Precautions Concerning Parts Replacement ......................................................... 178

3.2 Parts Layout ........................................................................................................... 180

3.3 Parts Replacement Methods .................................................................................. 181

3.3.1 Stepping Motor (Hopping) ...................................................................... 182

3.3.2 TQSB-2 PCB .......................................................................................... 184

3.3.3 Hopping Roller Shaft Assy and One-way Clutch Gear ........................... 184

4. TROUBLESHOOTING.................................................................................... 185

4.1 Precautions Prior to the Troubleshooting ............................................................... 185

4.2 Preparations for the Troubleshooting ..................................................................... 185

4.3 Troubleshooting Method......................................................................................... 186

4.3.1 LCD Status Message List ....................................................................... 186

5. CONNECTION DIAGRAM.............................................................................. 188

5.1 Interconnection Diagram ........................................................................................ 188

5.2 PCB Layout ............................................................................................................ 189

6. PARTS LIST ................................................................................................... 190

40718401TH Rev.5 4 /

1. CONFIGURATION

1.1 System Configuration

OKIPAGE 10ex 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.

40718401TH Rev.5 5 /

Paper

Cassette

*High Capacity
Second Paper

Feeder

Operator Panel

Paper Feeding Mechanism

(First Tray Unit)

Engine Unit

Face Up

Stacker

Face

*Multi Purpose

Feeder

Centronics

Electrophotographic

Processing Unit

Main Control Board

Down

Stacker

Power Supply

and Sensor Board

* : Optional

RS-232C

Memory*

Expansion Board
1 DRAM SIMM Socket
1 Flash SIMM Socket

or

RS-232C Serial*

Interface Board
1 DRAM SIMM Socket
1 Flash SIMM Socket

DRAM SIMM*

Flash SIMM*
(Flash memory)

Figure 1-1

40718401TH Rev.5 6 /

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.

Operator panel assy

Upper cover

Stacker assy

Optional board

Power supply/sensor board

Fusing unit

Toner-cartridge(Type 5)

(consumable)

Image drum unit(Type 5)

(consumable)

Legal/universal paper cassette

Main control board

Figure 1-2

40718401TH Rev.5 7 /

1.3 Optional Configuration

The options shown below are available for use with OKIPAGE 10ex. These are available separately from
the printer unit.

(1) High Capacity Second Paper Feeder

(2) Multi Purpose Feeder

(3) 1MB Memory Expausion Board

40718401TH Rev.5 8 /

(4) RS-232C Serial Interface Board

(5) 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.

(6) Flash SIMM

Flash SIMM is available with memory of 4MB and 8MB.

40718401TH Rev.5 9 /

1.4 Specification

(1) Type Desktop
(2) External dimensions Height 7.9” (200 mm)

(3) Weight Approx. 10 kg
(4) Developing method Dry electrophotography

Exposing method LED stationary head

(5) Paper used <Type>

Width 13.0” (330 mm)
Depth 15.6” (395 mm)

• 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

(Option) only]
– Monarch**
– 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 28lbs)

(6) Printing speed Continuous printing: 10 pages per minute with Letter size

paper. [Except Second Paper Feeder
(8.8PPM), Multi purpose Feeder (8.3ppm)]

Warm-up time:
First page print time: 12 seconds typical for the Letter size

(7) Paper feeding method Automatic feed or manual feed

40718401TH Rev.5 10 /

60 seconds typical at room temperature
[68˚F (20˚C), AC 120/230 V].

paper after warm-up.

(8) Paper delivery method Face down/face up
(9) Resolution 600 x 600 dots/inch

600 x 1200 dots/inch

(10)Power input 120 VAC + 5.5%, -15%

230 VAC ± 10%

(11)Power consumption Peak: Approx. 460W

Typical operation: Approx. 215W
Idle: Approx. 61W
Power save mode: Approx. 18W

(12)Temperature and humidity

In operation Power off mode During Storage Unit

Temperature

Humidity
Maximum wet bulb

temperature
Minimum difference

between wet and dry

50-90

(10-32)

20-80

77

(25)

35.6

(2)

32-110

(0-43)
10-90

80.4

(26.8)

35.6
(2)

14-110

(–10-43)

10-90

bulb temperatures

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

˚F

(˚C)

%RH

˚F

(˚C)

˚F

(˚C)

40718401TH Rev.5 11 /

1.5 Safety Standards

1.5.1 Certification Label
The safety certification label is affixed to the printer in the position described below.

INT AC : 230V model

ODA AC : 120V model ODA AC : 230V model

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.

40718401TH Rev.5 12 /

1.5.3 Warning/Caution Marking
The following warning and caution markings are made on the power supply/sensor board.

F3

CAUTION

ATTENTION ATENCÃO
CUIDADO CUIDÃDO

*

WARNING

AVERTISSEMENT
ADVERTENCIA
HEATSINK AND TRANSFORMER
PRESENT RISK OF ELECTRIC SHOCK
TEST BEFORE TOUCHING

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
O dissipador de calor e o núcleo do fransiormador apresentam risco de choque elétrico. Teste antes de
focar.

ENGLISH

Circuits maybe live after fuses open.

FRENCH

Il se peut que les circuits soient sous tension une fois que les fusibles ont éfé rerirés.

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.

* No fuse is mounted here for 200V series

40718401TH Rev.5 13 /

2. OPERATION DESCRIPTION

OKIPAGE 10ex 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 10ex block diagram is shown in Figure 2-1.

40718401TH Rev.5 14 /

1MB Memory Board

(Option)

RS232C Interface Board

or

(Option)

Main Control Board

Program & Font ROM

6MB Mask ROM

EEPROM

Centronics
parallel I/F

74LS07

+8V -8V 0V +5V +38V

Reset
circuit

For optional board

DATA

BUS

(32bit)

1 Chip CPU

Resident RAM

512K x 8 DRAM

(2MB)

Drum motor &

Registration motor

HEAT ON

drive circuit

FAN Driver

Multi-Purpose

Feeder (Option)

High Capacity
Second Paper

Feeder (Option)

Operation Panel

Drum Motor

MMRegistration Motor

FAN

FAN ALM

LED Head

Power Supply
Board

Inlet sensor 1

Inlet sensor 2

Paper sensor

Outlet sensor

Paper out sensor

Toner low sensor

Cover

open

switch

Low voltage

generation circuit

LSI

AC

transformer

Charge roller

Transfer roller

High voltage

generation

circuit

Fusing temperature

control circuit

Heater drive

circuit

Filter circuit AC IN

Developping

roller

Toner supply

roller

Cleaning

roller

Thermistor

Heater

Figure 2-1 OKIPAGE 10ex Block Diagram

40718401TH Rev.5 15 /

2.1 Main Control Board

The main control board consists of a single chip CPU, two program/font ROMs, four 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, 28.24-MHz clock, with
input frequency from a 7.06-MHz clock) which incorporates the RISC CPU and its peripheral
devices, and has the following functions:

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

(2) Program and Font ROMs

The Program and Font ROMs store the equipment program and various types of fonts. Mask ROM
is used as Program and Font ROMs. The mounting locations of these Program and Font ROMs vary
depending on the type of the ROMs.

(3) DRAM

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

The DRAM is a 2MB resident memory on the main control board that stores edited data, image data,
DLL data and macro data.

(4) EEPROM

1,024-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.

40718401TH Rev.5 16 /

2.2 Power Supply/Sensor Board

The power supply/sensor board consists of an AC filter circuit, a low voltage power supply circuit, a high
voltage power supply circuit, heater drive circuit, and photosensors.

(1) Low Voltage Power Supply Circuit

This circuit generates the following voltages.

Output voltage Use

+5 V

+38 V

+8 V
–8 V

+3.3V

(2) High Voltage Power Supply Circuit

This circuit generates the following voltages required for electrophotographic process from +5 V,
according to the control sequence from the main control board. When cover open state is detected,
+5 V supply is interrupted automatically to stop the supply of all high-voltage outputs.

Output Voltage Use Remarks

CH
DB
SB
TR
CB

-1.3 KV

-265 V/+300 V

-500 V/ 0 V
+500 V to +3.5 KV/-1100 V
+400 V/-1350 V

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

Voltage applied to charging roller
Voltage applied to developing roller
Voltage applied to toner supply roller
Voltage applied to transfer roller
Voltage applied to cleaning roller

Variable

(3) Photosensor

The photosensor mounted on this power supply/sensor board monitors the status of paper being
fed through the printer during printing.

40718401TH Rev.5 17 /

The sensor layout diagram is shown in Figure 2-2.

Heat roller

Transfer roller

Exit roller

Outlet sensor

Paper sensor

Inlet

Toner

sensor 2

sensor

Paper feeding direction

Hopping

roller

Paper end sensor

Inlet sensor 1

Registration roller

Figure 2-2

Sensor Function Sensing state

Inlet sensor 1

Detects the leading part of the paper and gives the monitor timing
for switching from hopping operation to feeding operation.

ON: Paper exists.

OFF: No paper exists.
Monitors paper feeding situation and paper size based on the
paper arrival time and running time.

Intel sensor 2

Detects the paper width.

ON: A4 or larger

OFF: Smaller than A4

Paper sensor

Outlet sensor

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.

ON: Paper exists.

OFF: No paper exists.

ON: Paper exists.

OFF: No paper exists.

Paper end sensor

Detects the end of the paper.

ON: Paper exists.

OFF: No paper exists.

Toner low sensor

40718401TH Rev.5 18 /

Detects the lack of toner.

- - - - -

2.3 Electrophotographic Process

2.3.1 Electrophotographic Process Mechanism
This mechanism actuates the printing of image data supplied by the main control board on the paper by

electrophotographic process.
The layout of the electrophotographic process mechanism is shown in Figure 2-3.

40718401TH Rev.5 19 /

Paper cassette Eject sensor lever

Eject roller assy Heat roller Charge roller Developing roller Toner cartridge

LED head Image drum unit

Back-up roller

Cleaning roller

Transfer roller Paper sensor

plate

Inlet

sensor

plate

Registration

roller

Hopping roller

40718401TH Rev.5 20 /

Figure 2-3

(1) Image Drum Unit

The image drum unit consists of a sensitive drum, a charger, and a developer. The unit forms a toner
image on the sensitive drum, using a electrostatic latent image formed by the LED head.

(2) Registration Motor

The registration motor is a pulse motor of 48 steps/rotation with two-phase excitement by the signal
from the main control board. It drives the hopping and registration rollers via two one-way clutches
according to the direction of rotation.

(3) Main (Drum) Motor

The main or drum motor is a pulse motor of 48 steps/rotation with two-phase excitement by the signal
from the main control board and is the main motor of this mechanism.

(4) LED Head

Image data for each dot line from the main control board is received by the shift register and latch
register. The 4992 LED's are driven to radiate the image data on the image drum.

(5) Fuser

The fuser consists of a heater, a heat roller, a thermistor and a thermostat.
The AC voltage from the power supply/sensor board is applied to the heater controlled by the

HEATON signal from the main control board. This AC voltage heats the heater. The main control
board monitors the heat roller temperature via the thermistor, and regulates the heater roller to keep
it at a designated temperature in the menu, depending on the thickness of the paper (tray 1&2:
light=165°C, medium light=170°C, medium=175°C, medium heavy and heavy=195°C; manual
feeding and power envelope feeder: light=175°C, medium light=180°C, medium=185°C, medium
heavy=190°C, heavy=195°C, transparency = 160°C) by connecting or disconnecting the AC
voltage supply to the heater.

When an abnormal rise of the heater roller temperature takes place, the thermostat of the heater
voltage supply circuit becomes active and forcibly cuts the AC voltage supply.

The temperature setting of the fuser can be changed through operator panel setting.

40718401TH Rev.5 21 /

2.3.2 Electrophotographic Process
The electrophotographic processing is outlined below. The electrophotographic printing process is

shown in Figure 2-4.
1 Charging

The surface of the image drum is charged uniformly with a negative charge by applying the negative
voltage to the charge roller.

2 Exposure

Light emitted from the LED head irradiates the negatively charged surface of the image drum. The
surface potential of the irradiated portion of the image drum surface becomes lower, forming the
electrostatic latent image associated with the print image.

3 Developing and toner recovery

When the negatively charged toner is brought into contact with the image drum, it is attracted to the
electrostatic latent image by static electricity, making the image visible.

At the same time, the residual toner on the image 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 of the paper 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 Temporary cleaning

Residual toner which remains on the image drum without being transferred is evened out by the
cleaning roller and is temporarily attracted to the cleaning roller by static electricity.

6 Fusing

The toner image transferred onto the paper is fused to the paper by heat and pressure.

An electrophotographic process timing chart is shown in Figure 2-5.

40718401TH Rev.5 22 /

Paper eject roller

(Face down)

Power supply

Paper eject roller

Paper eject

(Face up)

Cleaning roller

LED head

Image data

Registration roller Hopping roller

Heater roller

Power

supply

Doctor blade

Power supply

(Bias voltage)

Toner supply roller

Toner cartridge

Paper

eject

Fusing

Back-up roller Transfer roller

Charger roller

Charging

Cleaning

Paper hopping

Paper feed

Image

production

developing

Transfer

Cleaning

FusingPaper eject

Path of paper feeding

Direction of rotation of the image drum

Power supply

Outlet sensor

Inlet sensor

Developing

Developing roller

Paper sensor

Exposure

Transfer

Paper path selector

Paper

registration

Paper

supply

Paper tray

Figure 2-4

40718401TH Rev.5 23 /

Feed stopIN Sensor OFFFeed start

OUT Sensor OFF

PRDY-N

PRINT-N

DM-ON-N

RM-ON

INSNS

OUTSNS-N

Figure 2-5

40718401TH Rev.5 24 /

2.3.3 Process Operation Descriptions
(1) Hopping and Feeding

Hopping and feeding motions are actuated by a single registration motor in the mechanism as
shown below:

Registration motor

a

Idle gear

Registration roller

Hopping roller

b

Motor gear

Registration gear

Hopping gear

The registration motor turning in direction "a" drives the hopping roller. The registration motor
turning in direction "b" drives the registration roller. The registration and hopping gears have one­way bearing, so turning any of these gears in the reverse direction will not transmit the motion to the
corresponding roller.

40718401TH Rev.5 25 /

(a) Hopping

1 For hopping, the registration motor turns in direction "a" (clockwise direction) and drives

the hopping roller to advance the paper until the inlet sensor turns on (in this case, the
registration gear also turns, but the registration roller is prevented from turning by the one­way bearing).

2 After inlet sensor is turned on by the paper advance, the paper is further advanced to a

predetermined distance until the paper hits the registration roller (the skew of the paper
can thus be corrected).

Paper

a

Registration roller

Hopping roller

(b) Feeding

1 When hopping is completed, the registration motor turning in direction "b" (counter-

clockwise direction) drives the registration roller to advance the paper (in this case, the
hopping gear also turns, but the hopping roller is prevented from turning by the one-way
bearing).

2 The paper is further advanced in synchronization with the print data.

Image drum

Paper

b

Transfer roller

Registration roller

Hopping roller

40718401TH Rev.5 26 /

(2) Charging

Charging is actuated by the application of the DC voltage to the charge roller that is in contact with
the image drum surface.

Power

supply

Charge roller

Image drum

The charge roller is composed of two layers, a conductive layer and a surface protective layer, both
having elasticity to secure good contact with the image drum. When the DC voltage applied by the
power supply exceeds the threshold value, charging begins. The applied voltage is proportional to
the charge potential, with offset of approximately –550V.

charge potential

[V]

-750

-1300-550 [V]

applied voltage

40718401TH Rev.5 27 /

(3) Exposure

Light emitted by the LED head irradiates the image drum surface with a negative charge. The
surface potential of the irradiated portion of the image drum drops, forming an electrostatic latent
image associated with the image signal.

LED head

Charge roller

Power
supply

Paper

Image drum

LED head

Image drum

The image drum is coated with an underlayer (UL), a carrier generation layer (CGL), and carrier
transfer layer (CTL) on aluminum base. The organic photo conductor layer (OPC), comprising CTL
and CGL, is about 20 µm thick.

20

30mm

Image drum

CTL
CGL

UL

Base

µ

m

40718401TH Rev.5 28 /

The image roller surface is charged to about –750 V by the contact charge of the charge roller.
When the light from the LED head irradiates the image drum surface, the light energy generates

positive and negative carriers in the CGL. The positive carriers are moved to the CTL by an electrical
field acting on the image drum. Likewise, the negative carriers flow into the aluminum layer (ground).

The positive carriers moved to the CTL combine with the negative charges on the image drum
surface accumulated by the contact charge of the charge roller, lowering the potential on the image
drum surface. The resultant drop in the potential of the irradiated portion of the image drum surface
forms an electrostatic latent image on it. The irradiated portion of the image drum surface is kept
to about –100 V.

(V)

–750

Image drum

surface potential

–100

0

Charged part

Light
from
LED

Part

irradiated

by

LED

Charged

part

40718401TH Rev.5 29 /

(4) Developing

Toner is attracted to the electrostatic latent image on the image drum surface, converting it into a
visible toner image. Developing takes place through the contact between the image drum and the
developing roller.

1 As the toner supply roller rotates while rubbing on the developing roller, a friction charge is

generated between the developing roller and the toner, allowing the toner to be attracted to the
developing roller (the developing roller surface is charged positive and the toner, negative).

Doctor blade

Charge roller

Developing roller

Image drum

Toner supply roller

2 The toner attracted to the developing roller is scraped off by the doctor blade, forming a thin coat

of toner on the developing roller surface.

3 Toner is attracted to the exposed portion (low-potential part) of the image drum at the contact

of the image drum and the developing roller, making the electrostatic latent image visible.

-300V
Developing roller

+–+–+–+–+–+–+–+–+–+–+–+–+–+–+–+–+–+–+–+–+–+–+

+++++++++++++++++++++++

-750V -100V -750V -750V

–

Toner

Image drum

Exposed

part

An illustration of activities at the contact point of the image drum surface and
the developing roller (arrow marks denote the direction of the electrical field).

40718401TH Rev.5 30 /

Exposed

part

-100V

Note:

The bias voltage required during the developing process is supplied to the toner supply roller and the
developing roller, as shown below. –500 VDC is supplied to the toner supply roller, –265 VDC to the
developing roller.

Connected and bias supplied
when the cover is closed.

Developing roller

Base

Image drum

Toner supply roller

40718401TH Rev.5 31 /

(5) Transfer

The transfer roller is composed of conductive sponge material, and is designed to get the image
drum surface and the paper in a close contact.

Paper is placed over the image drum surface, and the positive charge, opposite in polarity to that
of the toner, is applied to the paper from the reverse side.

The application of a high positive voltage from the power supply to the transfer roller causes the
positive charge inducement on the transfer roller surface, transferring the charge to the paper as it
contacts the transfer roller. The toner with negative charge is attracted to the image drum surface,
and it is transferred to the upper side of the paper due to the positive charge on the reverse side of
the paper.

Image drum

Transfer roller

Paper

Power
supply

40718401TH Rev.5 32 /

(6) Fusing

When the transfer is completed, the toner image is fused to the paper by heat and pressure as the
paper with unfused toner image passes between the heater roller and the back-up roller. The heater
roller with Teflon coating incorporates a 400W heater (Halogen lamp), which generates heat.

A thermistor which is in contact with the heater roller regulates the temperature of the heater roller
to a designated temperature in the menu, depending on the thickness of the paper (tray 1&2:
light=165°C, medium light=170°C, medium=175°C, medium heavy and heavy=195°C/manual
feeding and power envelope feeder: light=175°C, medium light=180°C, medium=185°C, midium
heavy=190°C, heavy=195°C, transparency = 160°C). A safety thermostat cuts voltage supply to
the heater off by opening the thermostat in the event of abnormal temperature rises.

The back-up roller is held under a pressure of 3.76 kg applied by the pressure spring on each side.

Separation claw

Heater

Heater roller

Thermistor

Back-up roller

Pressure Spring

40718401TH Rev.5 33 /

(7) Cleaning

When the transfer is completed, the residual toner left on the image drum is attracted to the cleaning
roller temporarily by static electricity, and the image drum surface is cleaned.

Image drum

Cleaning roller

Power
supply

+DC

Transfer roller

(8) Cleaning of rollers

The charge, transfer and cleaning rollers are cleaned for the following cases:

• Warming up when the power is turned on.

• Warming up after the opening and closing of the cover.

• When the number of sheets accumulated reaches 10 or more, and the printout operation ends.
Changes in bias voltage applied to each roller move the attaching toner off the roller to the image

drum and return it to the developer.

40718401TH Rev.5 34 /

2.3.4 Revision of LED Head Illumination
An LED correcting head, which is capable of correcting the illumination of the LED for each dot, is being

used in this printer. LED illumination correction function of 16 steps is carried out by using an EEPROM
which is installed in the LSI that maintains the LED illumination correction values, and an LED correction
drivers (MSM6731BWAF or MSM6732BWAF) together as a pair.

The LED correcting head consists of the correction control LSI (MSM6730WAF), LED drivers
(MSM6731BWAF or MSM6732BWAF), and an LED array. The block diagram of the LED correcting
head is shown below.

From

CPU

STRB1-N
STRB2-N
STRB3-N
STRB4-N

LOADI

CLOCKI

DATAI0
DATAI1
DATAI2
DATAI3

MSM6730

WAF

LED Array

LED LED LED LED LED LED LED

EEPROM

Correction

Values

MSM6731BWAF

LED Driver

MSM6732BWAF

LED Driver

MSM6731BWAF

Printing and correction data combined signal line
Correction data signal line

LED Driver

MSM6732BWAF

LED Driver

The existing LED head receives the printing data from the CPU directly at its LED drivers. With the LED
correcting head, a correction control LSI (MSM6730WAF) is connected between the CPU and LED
drivers, so the printing data is input to the LED drivers through the correction control LSI. In order to
maintain compatibility with the existing LED head, the printing operation of the LED correcting head is
carried out through identical sequence.

The LED correcting head is a 600 dpi head, with the LED drivers located on both sides of the LED array
with a 300 dpi pitch spacing. The printing and correction data obtained from the CPU through four signal
lines are sent to the LED array.

40718401TH Rev.5 35 /

The printing operation timing chart is shown below.

Normal Mode Printing Timing Chart

CLOCKI

LOADI

DATAI3~0

STRB1I-N

STRB2I-N

STRB3I-N

STRB4I-N

First line printing data sent Second line printing data sent

First line printing

The printing operation is carried out in normal mode. Under ordinary circumstances such as when the
power is turned on or when LOADI signal level is low, the normal mode is enabled.

The printing operation is carried out in the following sequence. First, the printing data DATAI3 through
DATAI0 are stored, sequentially shifted, in the shift registers of the LED drivers, by the printing data
synchronous clock, CLOCKI. Then the printing data stored in shift registers are latched by the high level
pulse of LOADI. The latched printing data turns the LEDs on by STRB1I-N through STRB4I-N and
actuates printing.

40718401TH Rev.5 36 /

The mode setting timing chart during illumination correction is shown below.

Illumination Correction Mode Setting Timing Chart

100ns min

CLOCKI

LOADI

DATAI0

STRB1I-N

STRB2I-N

STRB3I-N

STRB4I-N

50ns

min

D4 D3 D2 D1 D0

Mode setting Mode enabled

50ns

min

200ns min 100ns min

Mode set

The mode setting is carried out in the following manner. LOADI is fixed at high level, and DATAI0 which

comes up following this is 4-data latched with the timing of the fall of CLOCKI. The illumination correction
mode is selected based on the latched 4-data combination. Then the mode becomes valid at the fifth
fall of CLOCKI.

The period during which the illumination correction mode is valid is from the fall of the fifth CLOCKI and

while the level of LOADI is high. When the level of LOADI becomes low, the illumination correction mode
is terminated, and the head returns to the normal mode, which is mode with which the printing is normally
carried out.

40718401TH Rev.5 37 /

The LED driver (MSM6731BWAF) corrects the LED illumination by controlling the LED current. The LED
illumination can be set in 16 steps, with 7 steps in the direction of illumination increase in relation to the
standard value, and 8 steps in the direction of decrease. For this reason, the LED correction data is a
4-bit data for each dot.

The relationship between the LED correction data and LED current correction steps with the LED driver
(MSM6731BWAF) used in an LED head is shown below.

LED Correction Data

msb b3

1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1

Correction Data

b2

0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0

b1

0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0

lsb b0

0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1

Correction

Step

+16%
+14%
+12%
+10%

+8%
+6%
+4%
+2%

0%

-2%

-4%

-6%

-8%

-10%

-12%

-14%

Correction

Mode

Correction by

increasing

illumination

No correction

Correction by

decreasing

illumination

40718401TH Rev.5 38 /

2.4 Paper Jam Detection

The paper jam detection function monitors the paper condition when the power is turned on and during
printing. When any of the following conditions arises, this function interrupts the printing process. If any
of the following errors is encountered, printing can be recovered by removing the jammed paper (by
opening the upper cover, removing the jammed paper and closing the upper cover).

Error Cause of error

Paper input jam

Paper feed jam

Paper exit jam

Paper size error

Main (drum) motor

• The paper is in contact with the inlet sensor when the power is turned on.

• After hopping operation is attempted three times, the leading edge of the paper does not reach
the inlet sensor.

• The paper is in contact with the paper sensor when the power is turned on.

• The leading edge of the paper does not reach the paper sensor within a predetermined feeding
distance since the paper has reached the inlet sensor.

• The trailing edge of the paper does not pass over the paper sensor within a predetermined
feeding distance after the same has passed over the inlet sensor.

• The leading edge of paper does not reach the outlet sensor within a predetermined feeding
distance after the paper has reached the paper sensor.

• The paper is in contact with the outlet sensor when the power is turned on.

• The paper does not pass over the outlet sensor within a predetermined feeding distance after
the leading edge of the paper has reached the outlet sensor.

• The paper size check for manual feeding finds that the paper size is free size.

• The size of the paper is monitored by the inlet sensor 1. The paper is not detected by the inlet
sensor 1 within predetermined feeding distance.

• The inlet sensor 2 detects that the size of the loaded paper is A4 or larger, or smaller than A4.
The detected paper size differs from the paper size set by command or menu.

• The paper size check for manual feeding finds that the paper size is free size.

Registration motor

Paper end sensor

Inlet sensor

Paper sensor

Outlet sensor

Jam Monitor

Top to top

Top to bottom

Top to bottom

Bottom to bottom

Checking for
paper form

Hopping

Monitoring

paper

input jam

Paper

feed

Paper size check

(paper width)

Monitoring

paper feed jam

Paper size check

(Paper length)

Monitoring

paper feed jam

Paper Feed Timing Chart

Paper

feed

Monitoring

paper

feed jam

Monitoring

paper exit jam

40718401TH Rev.5 39 /

Paper Feed Check List

Type of error Monitor Standard value

Plus

Error

Minus

Paper feed error

Paper feed jam
Paper feed jam

Paper size error

Paper exit jam

Paper feed jam

Note:

Paper Length List

Hopping start
In sensor on
Write sensor on
In sensor on
Out sensor on
In sensor off

to

In sensor on

to

Write sensor on

to

Out sensor on

to

Out sensor on

to

Out sensor off

to

Write sensor Off

Depends on the paper length
Depends on the paper length

Hyphen "-" in the table represents "not checked."

Type Paper length

A4
A5
B5

LETTER
LEGAL 13
LEGAL 14

EXEC

A6

Monarch

COM-9

COM-10

DL
C5

Free

297.0

210.0

257.0

279.4

330.2

355.6

266.7

148.0

190.5

225.4

241.3

220.0

229.0

110.1~355.6

72.0

20.0

140.5

22.2

Check range

Min Max

252.0

165.0

212.0

234.4

285.2

310.6

221.7

103.0

145.5

180.4

196.3

175.0

184.0

65.0

36.0

22.0

25.0

45.0

45.0

22.0

342.0

255.0

302.0

324.4

375.2

400.6

311.7

193.0

235.5

270.4

286.3

265.0

274.0

400.6

Unit : mm

–
–
–

45.0

45.0
–

Unit : mm

40718401TH Rev.5 40 /

2.5 Cover Open

When the stacker cover is opened, the cover open microswitch on the power supply/sensor board is
turned off to cut +5V supply to the high voltage power supply circuit. This results in the interruption of all
high-voltage outputs. At the same time, the CVOPN signal is sent to the main control board to notify that
the microswitch is off, and the main control board carries out the cover open process.

40718401TH Rev.5 41 /

2.6 Toner Low Detection

Toner Sensor

Sensor Plate

Stirring Gear Section

Stirring Bar

Sensor Plate

Stirring Bar

• Device
The Toner Low Detection device consists of a stirring gear which rotates at a constant rate, a stirring
bar and a magnet on the stirring bar. The stirring bar rotation is driven by the link to the gouged portion
in the stirring gear.

Magnet Gouged

Stirring Bar Stirring Gear

• Operation
Toner Low is detected by monitoring the time interval of the encounter of the magnet set on
the sensor plate and the magnet on the stirring bar.

portion

Operation during Toner Full state

• The stirring bar rotates due to the mechanical
transmission of energy originating from the inter­locking with the stirring gear.

• Even when the magnet on the stirring bar reaches
the maximum height, the stirring bar is pushed by
the stirring gear, since the other side is being
dipped in the toner.

Operation during Toner Low state

• When the stirring bar reaches the maximum height,
it falls to the minimum height due to its own weight,
since there is no resistance provided by the toner
on the other side. Because of this, the time interval
during which it is in encounter with the magnet of
the sensor plate becomes longer. By monitoring
this time interval, Toner Low state can be de­tected.

40718401TH Rev.5 42 /

TONER FULL state

TNRSNS-N

TONER LOW state

TNRSNS-N

• When the Toner Low state is detected 2 times consecutively, Toner Low is established.

160 ms < t1 < 0.8 sec

t1

2.63 sec.

t1 > 0.8 sec.

t1

2.63 sec.

• When the Toner Full state is detected 2 times consecutively, Toner Low is cancelled.

• When there is no change with the toner sensor for 2 cycles (2.63 sec. x 2) or more, then the Toner
Sensor Alarm is activated.

• The toner sensor is not monitored while the main (drum) motor is in a halt.

40718401TH Rev.5 43 /

3. PARTS REPLACEMENT

The section explains the procedures for replacement of parts, assemblies, and units in the field. Only
the disassembly procedures are explained here. For reassembly, reverse the disassembly procedure.

3.1 Precautions for Parts Replacement

(1) Before starting to replace parts, remove the AC cord and interface cable.

(a) Remove the AC cord in the following sequence:

i) Turn off (“o”) the power switch of the printer
ii) Disconnect the AC inlet plug of the AC cord from the AC receptacle.
iii) Disconnect the AC cord and interface cable from the printer.

(b) Reconnect the printer in the following procedure.

i) Connect the AC cord and interface cable to the printer.
ii) Connect the AC inlet plug to the AC receptacle.
iii) Turn on (“l”) the power switch of the printer.

Disconnect

OFF

ON

(2) Do not disassemble the printer as long as it is operating normally.
(3) Do not remove parts which do not have to be touched; try to keep the disassembly to a minimum.
(4) Use specified service tools.
(5) When disassembling, follow the laid out sequences. Parts may be damaged if these sequences are

not followed.

(6) Since screws, collars and other small parts are likely to be lost, they should temporarily be attached

to the original positions during disassembly.

(7) When handling IC’s such as microprocessors, ROMs and RAMs, or circuit boards, do not wear

gloves that are likely to generate static electricity.

Reconnect

(8) Do not place printed circuit boards directly on the equipment or floor.

40718401TH Rev.5 44 /

[Service Tools]
The tools required for field replacement of printed circuit boards, assemblies and units are listed in Table

3-1.

Table 3-1 Service Tools

No. Q' ty Application RemarksService Tools

1

2

3

4

5

6

7

8

No. 1-100 Philips screwdriver

No. 2-100 Philips screwdriver

No. 3-100 screwdriver

No. 5-200 screwdriver

Digital multimeter

Pliers

Handy cleaner

LED Head cleaner

1

2~2.5 mm screws

1

3~5 mm screws

1

1

1

1

1

1

Cleans LED head

40718401TH Rev.5 45 /

3.2 Parts Layout

This section explains the layout of main components of the equipment.
[Lower base unit]

Eject roller assy

Diselectrification bar

Spacer bearing L

Stacker cover assy

Back-up roller

View A

Transfer roller

Registration roller

Pulse motor
(main/drum)

Pulse motor
(registration)

Spacer bearing R

Fusing unit

Stacker cover assy

Lower base unit

LED head

View A

Manual feed guide assy

Toner cartridge (Type 5)

(consumable)

Hopping roller shaft

Hopping roller rubber

Image drum unit (Type 5)

(consumable)

Figure 3-1

40718401TH Rev.5 46 /

[Upper cover unit]

Upper cover

Figure 3-2

40718401TH Rev.5 47 /

[Base unit]

Transformer

Operator panel assy

Power supply/
sensor board

Face up stacker assy

Cassette guide(L)

DC fan assy

Main control board

Cassette guide (R)

Paper cassette

Figure 3-3

40718401TH Rev.5 48 /

3.3 How to Change Parts

This section explains how to change parts and assemblies listed in the disassembly diagram below.
In the parts replacement procedure, those parts marked with the part number inside ● with white letters

are RSPL parts.

Printer unit Upper cover assy

(3.3.1)
IC card cover

(3.3.2)
LED head

(3.3.3)
Transfer roller

(3.3.14)

1

2

Hopping roller shaft assy
(3.3.11)

Stacker cover assy
(3.3.12)

Registration roller
(3.3.13)

Power supply/sensor board and contact assy
(3.3.23)

Operator panel assy
(3.3.4)

Manual feed guide assy
(3.3.19)

Fusing unit
(3.3.15)

Back up roller
(3.3.16)

Face up stacker assy
(3.3.8)

Lower base unit
(3.3.5)

Transformer
(3.3.22)

Cassette guide (L)
(3.3.24)

Cassette guide (R)
(3.3.25)

Pulse motor (main/drum)
(3.3.6)

Pulse motor (registration)
(3.3.7)

Eject roller assy
(3.3.9)

Motor assy
(3.3.10)

Sensor plate (inlet)
(3.3.17)

Sensor plate (outlet)
(3.3.18)

Sensor plate (paper supply)
(3.3.20)

M5B-PCB
(3.3.21)

Spacer bearing (L/R)
(3.3.26)

To

To

1

2

40718401TH Rev.5 49 /

3.3.1 Upper Cover Assy
(1) With the power switch turned off, unplug the AC power cord from the outlet.
(2) Disconnect the interface cable 1.
(3) Press the knobs 2 on left and right sides and open the stacker cover assy 3.
(4) Take out the image drum unit 4.
(5) Remove two screws 5, and open the manual feed guide assy 6. Lift the front side of the upper

cover 7 up and unlock the latches at two locations on the back side. Lift and remove the upper cover
assy 7.

Notes : 1.

2.

When removing or reinstalling the upper cover, be careful not to get the motor cables
tangled or caught.

When reinstalling the screws 5, be sure to direct the screws into preexisting threads.

5

7

1

4

3

2

2

6

40718401TH Rev.5 50 /

3.3.2 IC Card Cover
(1) Open the IC card cover 1, press it from both sides at the hinges in the directions of arrows shown

below and remove it.

1

40718401TH Rev.5 51 /

3.3.3 LED Head
(1) Press the knobs on left and right sides and open the stacker cover assy 1.
(2) Open the hook section on the left side of the stacker cover and remove the LED head 2.

Note:

• Be sure not to touch directly or push on the SLA part of the LED head.

• Do not remove the LED cable 3 from the connector.

• Remove connector 4 and cable 3 together as an assembly from the LED head.

• After mounting the new LED head and resinstalling the cable, set drive time of the LED
head according to the marking on the LED head (see 4.2.1).

SLA

(Seltoc Lens Array)

4

3

SLA

1

2

40718401TH Rev.5 52 /

3.3.4 Operator Panel Assy
(1) Unlock two latches on the upper cover from the rear side, lift the operator panel assy 1 from the

back and remove it.

(2) Remove the Sumi card (operator panel) 2 from the connector (CN1) 3.

Note :

You can remove the operator panel assy while the upper cover installed on the unit. However,
it is much easier to remove the panel assy after removal of upper cover.

Rear view

2

Unlock two latches with a tip of
screw driver. For the purpose,
insert a driver through faceup
paper outlet as shown.

1

3

40718401TH Rev.5 53 /

3.3.5 Lower Base Unit
(1) Remove the upper cover assy (see 3.3.1).
(2) Remove the operator panel assy (see 3.3.4).
(3) Remove the face up stacker assy (see 3.3.8).
(4) Remove the connecting cables 2 and 3 of the pulse motors from the connectors (DM, RM) of the

M5B-PCB 1.
(5) Remove the LED head cables 4 and 5 from the connectors (HEAD1, HEAD2).
(6) Open the manual feed guide assy, remove six screws 7, then remove the lower base unit 6.

7

7

7

7

1

5

6

4

2

3

40718401TH Rev.5 54 /

3.3.6 Pulse Motor (Main/Drum)
(1) Remove the upper cover assy (see 3.3.1).
(2) Remove the lower base unit (see 3.3.5).
(3) Remove two screws 1 and remove the pulse motor (main/drum) 2 from the motor bracket 3.

View A

3

1

View A

1

2

40718401TH Rev.5 55 /

3.3.7 Pulse Motor (Registration)
(1) Remove the upper cover assy (see 3.3.1).
(2) Remove the lower base unit (see 3.3.5).
(3) Remove two screws 1 and remove the pluse motor (registration) 2 from the motor bracket 3.

View A

3

1

View A

1

2

40718401TH Rev.5 56 /

3.3.8 Face Up Stacker Assy
(1) Remove the upper cover assy (see 3.3.1).
(2) Remove the operator panel assy (see 3.3.4).
(3) Remove the screw 1 and remove the Sumi card (operator panel cable) 2 off the latch section of

face up stacker 4. Remove both the shield plate 3 and face up stacker 4 together.

(4) Unlock the latches at two locations, and remove the face up stacker 4.

2

4

3

1

40718401TH Rev.5 57 /

3.3.9 Eject Roller Assy
(1) Remove the upper cover assy (see 3.3.1).
(2) Remove the operator panel assy (see 3.3.4).
(3) Remove the face up stacker assy (see 3.3.8).
(4) Remove the lower base unit (see 3.3.5).
(5) Disengage the eject roller assy 1 from the lower base 2 by pressing the latch section of the eject

roller assy 1 in the direction of the arrow shown below, and remove the eject roller assy 1.

1

LATCH

2

40718401TH Rev.5 58 /

3.3.10 Motor Assy
(1) Remove the upper cover assy (see 3.3.1).
(2) Remove the operator panel assy (see 3.3.4).
(3) Remove the face up stacker assy (see 3.3.8).
(4) Remove the lower base unit (see 3.3.5).
(5) Stand the lower base unit on its side as shown, and unlock two latches, then remove the motor assy

1.

1

40718401TH Rev.5 59 /

3.3.11 Hopping Roller Shaft Assy
(1) Remove the upper cover (see 3.3.1).
(2) Remove the operator panel assy (see 3.3.4).
(3) Remove the face up stacker assy (see 3.3.8).
(4) Remove the lower base unit (see 3.3.5).
(5) Remove the motor assy (see 3.3.10).
(6) With the lower base unit 1 standing on its side, remove the one-way clutch gear 2 and the bearing

(A) 3.

(7) Remove the hopping roller shaft assy 4 (the bearing (B) 5 comes off, so be careful not to lose it).

2

3

1

4

5

40718401TH Rev.5 60 /

3.3.12 Stacker Cover Assy
(1) Remove the upper cover assy (see 3.3.1).
(2) Remove the operator panel assy (see 3.3.4).
(3) Remove the face up stacker assy (see 3.3.8).
(4) Remove the reset lever R 1.
(5) Detach the reset spring 2 from the lower base unit 3, turn the reset lever L 4 in the direction of

arrow A until it stops, and remove it in the direction of arrow B .

(6) Unlock two latches of the lower base unit 3, then remove the stacker cover assy 5.

Note :

When reinstalling the reset lever L 4, fit it onto the guide of the lower base unit 3, turn it in the
direction of arrow C while pressing down the shaft of back up roller, and engage the reset lever
L 4.

5

A

4

1

C

A

2

3

B

4

40718401TH Rev.5 61 /

3.3.13 Registration Roller
(1) Remove the upper cover (see 3.3.1).
(2) Remove the operator panel assy (see 3.3.4).
(3) Remove the face up stacker assy (see 3.3.8).
(4) Remove the lower base unit (see 3.3.5).
(5) Remove the motor assy (see 3.3.10).
(6) With the lower base unit standing on its side, remove the one-way clutch gear 1.
(7) Press the registration roller 2 in the direction of arrow A and lift up the left side of it, then remove

the registration roller 2 and the bearing (registration) 3.

(8) Pull out the registration roller 2 in the direction of arrow B .

1

3

2

2

View A

View A

B

A

40718401TH Rev.5 62 /

3.3.14 Roller Transfer Assy
(1) With the power switch turned off, unplug the AC cord from the outlet.
(2) Open the stacker cover.
(3) Release the roller transfer assy 1 by unlocking the latch of the main unit (never apply excessive

force when unlocking the latch).

(4) Lift the right side of the roller transfer assy 1, and shift it to the right side, then pull it out from the

main unit (at this time, the bearings 2 of the left and right sides of the roller transfer assy 1 will also
come off).

2

1

1

Unlock

2

40718401TH Rev.5 63 /

3.3.15 Fusing Unit
(1) Remove the upper cover (see 3.3.1).
(2) Remove the operator panel assy (see 3.3.4).
(3) Remove the face up stacker assy (see 3.3.8).
(4) Remove the stacker cover assy (see 3.3.12).
(5) Remove four screws 1, lift and remove the fusing unit 2.
Caution: Fusing unit may be hot. Use care when handling.

Notes : 1.

2.

3.

When reinstalling or removing the fusing unit, tighten or loosen the screws while holding
the fusing unit assy 2 down with your hand (it is being pushed up by back up roller).

When reinstalling the screws 1, be sure to direct the screws into preexisting thread and
avoid damaging the threads.

Do not apply excessive torque when tightening the screws 1.

1

2

1

40718401TH Rev.5 64 /

3.3.16 Back-up Roller
(1) Remove the fusing unit assy (see 3.3.15).
(2) Lift the left side of the back-up roller 1, and pull it out to the left side (at this time, two bushings (back-

up) 2 and the bias springs (back-up) 3 will also come off).

2

1

3

2

3

40718401TH Rev.5 65 /

3.3.17 Sensor Plate (Inlet)
(1) Remove the upper cover (see 3.3.1).
(2) Remove the operator panel assy (see 3.3.4).
(3) Remove the face up stacker assy (see 3.3.8).
(4) Remove the lower base unit (see 3.3.5).
(5) Press the clamps of three sensor plates (inlet and paper) 1, and remove them by pressing them

upward from the bottom.

1

Sensor plate (paper)

1

Sensor plate (inlet)

1

Sensor plate (inlet)

40718401TH Rev.5 66 /

3.3.18 Sensor Plate (Outlet)
(1) Remove the upper cover assy (see 3.3.1).
(2) Remove the operator panel assy (see 3.3.4).
(3) Remove the eject roller assy (see 3.3.9).
(4) Remove the face up stacker assy (see 3.3.8).
(5) Remove the lower base unit (see 3.3.5).
(6) Remove the fusing unit assy (see 3.3.15).
(7) Press the clamps of the sensor plate (outlet) 1, and remove the sensor plate by pushing it up.

1

1

40718401TH Rev.5 67 /

3.3.19 Manual Feed Guide Assy
(1) Remove the upper cover assy (see 3.3.1).
(2) Open the manual feed guide assy 1, and release the engagement on both sides with the main unit

by carefully bending the manual feed guide assy 1.

Note :

When remounting, verify the proper the engagements as shown in the diagram.

Put the post into the groove.

Put the post into the groove.

1

40718401TH Rev.5 68 /

3.3.20 Sensor Plate (Paper Supply)
(1) Remove the upper cover assy (see 3.3.1).
(2) Remove the operator panel assy (see 3.3.4).
(3) Remove the face up stacker assy (see 3.3.8).
(4) Remove the lower base unit (see 3.3.5).
(5) Press the clamps of the sensor plate (paper supply) 1 to unlock the latch, and remove it from the

base plate 2.

1

1

View A

View A

2

40718401TH Rev.5 69 /

3.3.21 M5B-PCB
(1) Remove the upper cover assy (see 3.3.1).
(2) Remove the operator panel assy (see 3.3.4).
(3) Remove the face up stacker assy (see 3.3.8).
(4) Remove the lower base unit (see 3.3.5).
(5) Remove the connector (2NDTRAY) 6.
(6) Remove three screws 1.
(7) Move the M5B-PCB 2 in the direction of arrow to disconnect it from the power supply/sensor board

3.
(8) Remove the connector FAN, and disconnect the fan motor 4.
(9) Remove the M5B-PCB 2, together with the PCB guide plate (remove the fan motor 4 at the same

time).

(10)

Remove three screws 8 and remove the PCB guide plate 7 from the M5B-PCB 2.

Note :

When reinstalling the M5B-PCB 2 onto the guide plate 7, be careful not to bend the base plate
(it is desirable to place a block underneath it to prevent bending).

8

4

1

7

1

6

2

8

3

40718401TH Rev.5 70 /

3.3.22 Transformer
(1) Remove the upper cover assy (see 3.3.1).
(2) Remove the operator panel assy (see 3.3.4).
(3) Remove the face up stacker assy (see 3.3.8).
(4) Remove the connectors (CN1 and CN2).
(5) Remove two screws 1, and remove the transformer 2.

Note :

When reinstalling the transformer, be sure to lay the AC and transformer’s primary side cables
under the divider (see view A diagram below).

AC Inlet

Transformer

1

AC Switch

View A

2

View A

40718401TH Rev.5 71 /

3.3.23 Power Supply/Sensor Board and Contact Assy
(1) Remove the upper cover assy (see 3.3.1).

(2) Remove the lower base unit (see 3.3.5).
(3) Remove the M5B-PCB (See 3.3.21).
(4) Remove the transformer (see 3.3.22).
(5) Remove the AC inlet 1 from the base plate 2.
(6) Remove the screw 3 and remove the grounding (earth) wire 4.
(7) Remove three screws 5, and remove the power supply/sensor board 6 and contact assy 7

together.

(8) Unlock two latches 8, and remove contact assy 7 from the power supply/sensor board 6.

Notes : 1.

2.

3.

Be careful about the sensor (paper supply) when reinstalling the lower base.
Make sure that no excessive force is applied to the power supply switch.
When installing the power supply/sensor onto the base plate, be careful not to bend the

base plate (it is desirable to place a block underneath it to prevent bending).

7

View A

1

5

5

5

View A

8

6

3

4

2

40718401TH Rev.5 72 /

3.3.24 Cassette Guide L Assy
(1) Remove the paper cassette.
(2) Remove the upper cover assy (see 3.3.1).
(3) Remove the lower base unit (see 3.3.5).
(4) Remove the M5B-PCB (see 3.3.21).
(5) Remove the transformer (see 3.3.22).
(6) Remove the power supply/sensor board (see 3.3.23).
(7) Remove two screws 1, and remove the guide rails 2.
(8) Remove the screw 3, and remove the cassette guide L 9 by shifting it in the direction of the arrow

as shown below.
(9) Remove cassette lock lever 4 and torsion spring 5.
(10)Remove cassette lock lever spring 8 then remove the sheet link (L) 6 and Pull block 7.

3

9

4

5

1

2

7

6

8

40718401TH Rev.5 73 /

3.3.25 Cassette Guide R Assy
(1) Remove the paper cassette.
(2) Remove the upper cover assy (see 3.3.1).
(3) Remove the lower base unit (see 3.3.5).
(4) Remove the M5B-PCB (see 3.3.21).
(5) Remove two screws 1, and remove the guide rails 2.
(6)

Remove the screw 3, and remove the cassette guide R 4 by shifting it in the direction of arrow.
(7) Remove the cassette lock lever 5 and torsion spring 6.
(8)

Remove the cassette lock lever spring 9, then remove the sheet link (R) 7 and link pull block 8.
(9) Remove two screws 0, and remove the square-shaped connector A.

3

8

9

2

7

5

6

4

A

1

0

1

40718401TH Rev.5 74 /

3.3.26 Spacer Bearing (L/R)
(1) Remove the back-up roller (see 3.3.16).
(2) Remove spacer bearing (L/R) with a tip of screw driver.

Spacer bearing L Spacer bearing R

40718401TH Rev.5 75 /

4. ADJUSTMENT

This chapter provides explanations concerning the adjustment necessary when replacing a part. The
adjustment is made by changing the parameter value set in EEPROM on the main control board. The
parameter can be set by the key operation from the operator panel. This printer has three kinds of
maintenance modes, and it is necessary to select one of the modes when replacing any parts.

4.1 Maintenance Modes and Functions

4.1.1 User Maintenance Mode
To enter into the user maintenance mode, turn the POWER switch on while holding the MENU key down.
Function
There are five functions as follows:

• Menu reset • Opepane menu disable

• Hex dump • X-adjust

• Drum counter reset • Y-adjust

• Recieve buffer • 2nd Tray

• Setting • Place page
Detailed descriptions of these functions are provided in Appendix D, DIAGNOSTICS TEST.

4.1.2 System Maintenance Mode

Note:

To enter into the system maintenance mode, turn the POWER switch on while holding the
down.

Function
There are six functions as follows:

• Page count display • Loop test

• Page count printing enable/disable • EEPROM reset

• Rolling ASCII continues printing • SIDM enable/ disable
Detailed descriptions of these functions are provided in Appendix D, DIAGNOSTICS TEST.

This mode is used only by maintenance personnel and it should not be released to the end­users.

Recover

key

40718401TH Rev.5 76 /

4.1.3 Engine Maintenance Mode

Note:

This mode is used only by maintenance personnel, and it should not be released to the end
users.

(1) To enter into the engine maintenance mode, turn the power on while holding ENTER and FORM

FEED keys down.
(2) Functions of this mode are selected by the menu.
(3) The way to exit out of this mode varies depending on the settings.
(4) There are following engine maintenance modes:

a) Head drive time setting

Sets the drive time of the LED head.

b) Head width setting

Sets the width of the LED head (39 or 40 chips).

c) Printing start position setting

Sets the starting position of printing.

d) Drum count total display

The total image drum rotation count of the printer, as counted by the engine section, is displayed
on the LCD.

e) Drum count display

The total image drum rotation count, as counted by the engine section, is displayed on the LCD.

f) Standard tray paper feeding quantity setting

Sets the amount of paper to be fed from the standard tray.

g) High Capacity Second Paper Feeder paper feeding quantity setting

Sets the amount of paper to be fed from High Capacity Second Paper Feeder.

h) High Capacity Second Paper Feeder downloading table selection

Selects the downloading table of High Capacity Second Paper Feeder.

i) Power Envelope Feeder paper feeding quantity setting

Sets the amount of paper to be fed from Power Envelope Feeder.

j) Power Envelope Feeder downloading table selection

Selects the downloading table of Power Envelope Feeder.

k) Engine Reset

All EEPROM areas used by the engine section are reset to factory default values.
The followings, however, are not reset:
After reset, the printer returns to normal operating mode.

• Menu Level-1

• Menu Level-2

• Operator Panel Menu Disable/Enable

• LED HEAD No.

• LED HEAD WID

• Page Print Disable/Enable

Note:

Please do re-set up LED Head type to "Type2D4" when the printer was done the engine reset

operation by manual or auto setting.

Because when it is done, the LED Head type is returned to the initial setting, which is "Type 1".

Application ROM (F/W Ver.1.01).

8174627N0011(MX23C2410MC-10-100 : IC3)
8174627N0012(MX23C2410MC-10-101 : IC2)

Note:

"Printing start position setting" is for shipping. Do not change its default value.

Detailed descriptions of these functions are porvided in Appendix D, DIAGNOSTICS TEST.

40718401TH Rev.5 77 /

4.1.4 EEPROM initialization
The corresponding are of the EEPROM is initialized for each event as shown Table 4-1.

EEPROM area

No Event

1

User maintenance
menu reset

System main-

2

tenance EEPROM
reset

Engine maintenance

3

engine reset

Firm revision check

4

error at power-on

Talbe 4-1 EEPROM Initial Setting Range

Menu level 1

Menu level 2

F/W revision area

Customer information

User maintenance area

Note1)

System maintenance area

Note1)

Engine maintenance area

Note1)

Drum counter

Fuser counter

Page counter

Note2) Note2)

Engine ID check

5

error at power-on

Customer setting

6

User information

7

error

: Represents initialization

Note1) Items of each maintenance menu which are subjects here are listed in the following table.
Note2) Only when the page counter is 500 sheets or less, it is reset to 0.

Talbe 4-1 Items of Each Maintenance Menu Targeted for EEPROM Reset

User maintenance menu area
Receiving buffer

Operator panel menu function
enable/disable

X/Y ADJUST

2ND feed destination
designating command
Left alignment based printing shift
Cleaning cycle

Transfer current
(Only Engine ID check error at
power on Event)

System maintenance menu area
SIDM emulation switch
enable/disable

Engine maintenance menu area
Adjusting head type
(excluding during engine reset in engine maintenance)
600 x 1200DPI strobe time relative value
(excluding during engine reset in engine maintenance)
Installed LED head identification
(excluding during engine reset in engine maintenance)

Print start position
Paper feed amount from each paper feed tray
Each optional tray motor controlling parameter
Engine test

40718401TH Rev.5 78 /

4.2 Adjustment When Replacing a Part

Adjustment is necessary when replacing any of the following parts.

Part Replaced Adjustment

LED Head
Image Drum Cartridge

Main Control Board

4.2.1 Setting of LED Head Drive Time

Note:

• Luminous Intensity Marking Label

When the luminous intensity marking of the replacement LED head (new part) is same as that
of the removed LED head (old part), do not reset the LED head drive time.

Set the LED head drive time.
Reset the image drum counter

(refer to User's manual).
EEPROM data Upload / Download

ex.
If there is a "TH" marking, it
means about manufacturing
location of Thailand.

Last 3 digits represent the
LED head marking number.

Luminous intensity marking

027

ı

154

40718401TH Rev.5 79 /

• Setting of LED Head Drive Time

Drive time of the LED head is set by setting the parameter of drive time of EEPROM according to
the luminous intensity marking on the LED head.

a. Corresponding table of luminous intensity marking and drive time parameter

Luminous intensity

marking on LED head

(~ 020)

(021)

(022 ~ 024)

(025)

(026)
027 ~ 028
029 ~ 030
031 ~ 032
033 ~ 035
036 ~ 037
038 ~ 040
041 ~ 043
044 ~ 046
047 ~ 049
050 ~ 052
053 ~ 057

Drive time parameter

32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17

Luminous intensity

marking on LED head

058 ~ 060
061 ~ 064
065 ~ 069
070 ~ 073
074 ~ 079
080 ~ 084
085 ~ 090
091 ~ 096
097 ~ 103

104 ~ 110
(111 ~ 118)
(119 ~ 126)

(127 ~ 135)

(136 ~ 144)
(145 ~ 154)

(155 ~)

Drive time parameter

16
15
14
13
12
11
10

9
8
7
6
5
4
3
2
1

*( ) marking of the luminous intensity marking on LED head depend on the darkness control
parameter.

b. Corresponding table of darkness setting and drive time parameter

Darkness setting

-2

-1
0

+1
+2

Drive time parameter

-4

-2
0

+3
+6

* The drive time parameter of the LED head depend on the setting of the darkness control.
ex. Luminous intensity marking on LED head : 027~028

Darkness setting : -2
Drive time parameter : 31 [27–(-4)]

The drive time parameter in the Table of Item B

The drive time parameter in the Table of Item A

40718401TH Rev.5 80 /

c. Setting

Example: Method for setting the parameter to 19 (for a case where the previous parameter setting

was 8).

Operation

Turn the POWER switch
on while holding the
FORM FEED and ENTER
keys down.

Press the MENU key

Press or key, until "19"
is displayed.

Press the ENTER key

LCD display after operation

ENG MNT

LED HEAD

No. 8 *

LED HEAD

No. 19

LED HEAD

No. 19 *

Displays previous
parameter No.

Parameter 19 is
set to EEPROM
(* is displayed on
LCD)

The printer is booted with
selected setting by pressing
ON LINE key.

XXX: HP4, Auto, Adobe PS or HEX

HEX DUMP

40718401TH Rev.5 81 /

ON-LINE

XXX

4.2.2 Uploading/Downloading EEPROM data
When the controller printed circuit board is replaced, the contents of the old EEPROM shall be copied

to the new EEPROM on the new board to preserve customer settings. For the purpose, use the EEPROM
operation on the Option of the Maintenance Utility. To copy follow the steps below.

(1) Be sure to confirm that the printer and the PC are connected with a centronics I/F cable. Then

execute the Maintenance Utility. (Note: Printer driver shall be deinstalled.)
(2) Select the Option on the Maintenance Utility.
(3) Click the "UPLOAD EEPROM" button on the "EEPROM Operations".
(4) The contents of the EEPROM data is displayed on the "DIALOG" of the Maintenance Utility. The

contents of the old EEPROM is now copied into the memory of the PC.
(5) Replace the controller P.C.B. with a new one while it displays the above "DIALOG".
(6) After the replacement, click "Download EEPROM" on the "EEPROM Operations". EEPROM upload

has been completed.
In case of troubles such as centronics I/F failure, etc. EEPROM data may not be uploaded properly. In

such case, it is necessary to adjust the following settings manually after the replacement using the
Maintenance Utility.

• LED driver time (See 4.2.1)

• Factory setting (ODA/OEL/INT-A/INT-L)
The maintenance utility is designed to be used only by field engineer and it should not be released to

the end-users.

40718401TH Rev.5 82 /

5. PERIODICAL MAINTENANCE

5.1 Periodical Replacement Parts

The parts are to be replaced periodically as specified below:

Part name Condition for replacement Cleaning Remarks

• Toner cartridge(Type 5)

• Image drum cartridge
(Type 5)

About 20,000 sheets of paper have been printed.
See 1.4. (14)

5.2 Cleaning

Remove any toner or dust accumulated inside the printer. Clean in and around the printer with a piece
of cloth when necessary. Use the handy cleaner (service tool) to clean inside the printer.

Note:

5.2.1 Cleaning of LED Lens Array
Clean the LED lens array or replace the toner cartridge when white lines or stripes (void, light printing)

are generated vertically down the page, as shown below.

Note:

Do not touch the image drum, LED lens array, or LED head connector block.

The LED lens array must be cleaned with an LED head cleaner included in the replacement

toner kit.

• LED headAbout 2,000 sheets of paper have been printed.

Consumables
Consumables

White lines or stripes
(void, light printing)

40718401TH Rev.5 83 /

(1) Set the LED head cleaner to the LED lens array as shown in the figure, then slide the cleaner back

and forth horizontally several times to clean the head.

Note:

Gently press the LED head cleaner onto the LED lens array.

LED head clean pad

LED lens array

(2) Throw the cleaner pad away.

40718401TH Rev.5 84 /

5.2.2 Cleaning Page Function
There is a charge roller cleaning function with this printer, which can be executed by the user.
(1) While the printer is in off-line mode, press both and keys simultaneously for at least 2 seconds.

The printer enters the cleaning mode.

(2) The LCD displays "CLEANING" on the upper line, and on the lower line, "MANUAL LETTER

REQUEST" is displayed, scrolling one character width at a time from right to left "LETTER" on the
lower line may instead be "A4" depending on the printer designation. While the lower line scrolls
the message, the message on the upper line remains fixed in place.

When the above messages appear on the LCD, the user can verify that the printer has entered the
cleaning mode and that it is requesting insertion of a letter (or A4) size paper into the manual

feederslot.
(3) Insert a sheet of paper into the manual feeder slot.
(4) Toner attached to the image drum is transferred onto the inserted sheet, and the sheet is ejected

with the toner residues printed. While this process is going on, the LCD displays "PRINT

CLEANING" message.
(5) The printer returns to off-line mode.

40718401TH Rev.5 85 /

6. TROUBLESHOOTING PROCEDURES

6.1 Troubleshooting Tips

(1) Check the troubleshooting section in the Printer Handbook.
(2) Gather as much information about the situation as possible.
(3) Inspect the equipment under the conditions close to those in which the problem had occurred.

6.2 Points to Check before Correcting Image Problems

(1) Is the printer being run in proper ambient conditions?
(2) Are supplies (toner) and routine replacement part (image drum cartridge) being replaced properly?
(3) Is the printing paper normal (acceptable quality)?
(4) Is the image drum cartridge being loaded properly?

6.3 Tips for Correcting Image Problems

(1) Do not touch, or bring foreign matter into contact with the surface of the image drum.
(2) Do not expose the image drum to direct sunlight.
(3) Keep hands off the fuser unit as it heats up during operation.
(4) Do not expose the image drum to light for longer than 5 minutes at room temperature.

40718401TH Rev.5 86 /

6.4 Preparation for Troubleshooting

(1) Operator panel display

The failure status of the printer is displayed by the liquid crystal display (LCD) of the operator panel.

Take proper corrective action as directed by messages which are being displayed on the LCD.

<For ODA>

or

READY

<For OEL/INT>

Status message display

Ready LED display

A4 LTR OTHER

LGL ENV

MENU 1

Menu 2

ON LINE

OKIPAGE

Recover

PAPER SIZE

Print Menu

Press 2 seconds

Reset

TRAY TYPE

Print Fonts

ex

10

DIGITAL LED PRINTER

ENTER

Power Save

FORM FEED

Print Demo

®

®®

Adobe PostScript

: Off : Blinking

: On : Undefined

40718401TH Rev.5 87 /

6.5 Troubleshooting Flow

Should there be a problem with the printer, carry out troubleshooting according to the following procedure
flow:

Problems

Problems
indicated by LCD
message

Image problems
(and problems which
are not indicated by
LCD message)

6.5.1 LCD Status Message/Problem List
The status and problems which may be displayed by messages on the LCD are listed in Table 6-1.

Troubleshoot from the LCD
status message list.
See Section 6.5.1.

Carry out a detailed
troubleshooting with the
troubleshooting chart.
See Section 6.5.2.

Carry out a troubleshooting
with the troubleshooting chart.
See Section 6.5.3.

40718401TH Rev.5 88 /

Category LCD status message Problem or status Remedy

Controller errors – Normal operation cannot be ensured. Turn the power

off, then back on to restart.

– If normal operation is not recovered by this restart

procedure, replace the main control board.

ERROR On

aaaaaaaa

Code

(nn)

Error

1~3

D~F

4

5

6

7

8

9

A

B

C

Reserved

Address Error Exception

(Load command, command fetch)

Address Error Exception

(Store command)

Bus Error Exception

(Command fetch)

Bus Error Exception

(Load command, store command)

System Call Extension

Break Point Exception

Reserved Instruction Exception

Coprocessor Unusable Exception

Arithmetic Overflow Exception

An error occurred in the controller.

n = Exception Code

aaaaaaaa = Error Address

Table 6-1(1/9)

40718401TH Rev.5 89 /

Category LCD status message Problem or status Remedy

Controller errors

(continued)

– Turn the power off, then back on to recover from the

error.

– If normal operation is not recovered by this restart

procedure, use the following remedial actions.

ERROR nn

Code

(nn)

Error

10

20

30

40

50

51

60

61

70

71

An error was detected by program ROM check.

An error was detected by font ROM check.

An error was detected by resident RAM check.

An error was detected by EEPROM check.

An error was detected by optional software ROM

check.

An error was detected by Flash SIMM.

An error was detected by optional RAM check.

Data bus Error between Cos and Databus for

Option DRAMs.

A failure occurred with the Fan motor.

A failure occurred with the fuser (timeout error

etc.).

Remedy

Replace the main control board.

Replace the main control board.

Replace the main control board.

Replace the EEPROM or main control board.

Check the optional software ROM board for proper con-

nection or replace it.

Check the optional Flash SIMM for proper connection or

replace it.

– Check the optional RAM board for proper connection.

– Check the mounting position of short plugs and addi-

tional RAM chips (see Section 7.4).

– Replace the optional RAM board.

Check the optional DRAM SIMM for proper connection

or replace it.

– Check the fan motor for proper connection and for any

presence of foreign matter in the fan (see Section 6.5.-

2-

6

).

– Replace the fan or the main control board.

See Section 6.5.2 -

4

.

An error occurred in the controller.

Table 6-1 (2/9)

40718401TH Rev.5 90 /

Category LCD status message Problem or status Remedy

Controller errors

(continued)

ERROR nn

Code

(nn)

Error

72

73

74

77

80

81

90

91

F0

F1

F2

F3

F4

A failure occurred with the fuser (thermistor open

error).

A failure occurred with the fuser (thermistor short

error).

SSIO Error

A toner sensor fault has occurred when the

TOTAL DRAM COUNT is 30 or less.

I/F timeout occurred between the main control

board and the operator panel.

I/F timeout occurred between the main control

board and the optional tray (High Capacity Second

Paper Feeder, Power Envelope Feeder, etc.).

A watchdog timer timeout occurred.

CPU Error

Monitor error (double weight)

Monitor error (argument error)

Optional Timeout error

Optional status error

BG program error

Remedy

See Section 6.5.2 -

4

.

See Section 6.5.2 -

4

.

– Check the connection between the main control board

and the power supply/sensor board.

– Replace the main control board or power supply/sen-

sor board.

– Check the installing of Image drum unit.

– Replace the power supply/sensor board.

– Check the operator panel for proper connection.

– Replace the flexible cable, operator panel or main con-

trol board.

See Section 6.5.2 -

5

.

– Turn the power off, then back on again.

– Replace the main control board.

Note: When replacing the main control board,

be sure to install the EEPROM from the

old board onto the new board.

Table 6-1 (3/9)

40718401TH Rev.5 91 /

Category LCD status message Problem or status Remedy

Controller errors

(continued)

Interface errors

Cover open

Jam errors

ERROR nn

HOST I/F

ERROR

COVER

OPEN

COVER T2

OPEN

tray

INPUTJAM

Code

(nn)

Error

F5

F6

F7

System timer program error.

Defect in the cable of the front feeder paper

sensor and the 2-pin connector on the main

control board.

Poor connection of connectors.

IPT2 program error

IPT1 program error

Remedy

– Turn the power off, then back on again.

– Repair or replace the defective front feeder paper

sensor cable and 2-pin connector on the main control

board or reconnect the connectors.

– Replace the main control board.

– Turn the power off, then back on again.

– Replace the main control board.

– Press the operator panel

RECOVER

key to release the

error display.

When serial I/F board has been installed,

– Check the settings related serial I/F of the menu.

– Replace the serial I/F cable or main control board.

– Close the cover to release the error display.

– If the display does not change after this procedure, re-

place the power supply/sensor board.

– Close the cover to release the error display.

– Check the connection between the main control board

and TQSB-2-PCB.

– Replace the main control board, TQSB-2-PCB or con-

nector.

– Check the paper in the cassette. Open and then

close the cover. When the cover is closed, recovery

printing is performed and the error display is released.

– If this error occurs frequently, see Section 6.5.2.

2

-1.

An error occurred in the serial I/F.

This message is displayed when a parity error, a framing

error or an overrun error is detected. (When an error

occurred in serial I/F)

The upper cover was opened.

The High Capacity Second Paper Feeder option cover

was opened.

A jam occurred during paper hopping from the tray.

tray : TRAY1, TRAY2, FEEDER, MANUAL

Table 6-1 (4/9)

40718401TH Rev.5 92 /

Category LCD status message Problem or status Remedy

Jam errors

(continued)

Paper size error

Tray paper out

Size error

– Open the cover, remove the paper, then close the

cover. When the cover is closed, recovery printing is

performed and the error display is released.

– If this error occurs frequently, see Section 6.5.2.

2

-2.

– Open the cover, remove the paper, then close the

cover. When the cover is closed, recovery printing is

performed and the error display is released.

– If this error occurs frequently, see Section 6.5.2.

2

-3.

– Check the paper in the tray or check to see if more than

one sheet of paper were being fed simultaneously.

– Set the designated paper in the tray.

– Open the cover, then close it to perform recovery

printing and release the error display.

– If this error occurs frequently, see Section 6.5.2.

3

.

Load paper in the tray.

Load the requested paper in the tray.

tray

FEED JAM

tray

EXIT JAM

tray

SIZE ERR

tray

PAPEROUT

tray

#PAPER

REQUEST

MANUAL

#REQUEST

A jam occurred during paper feeding after completion of

paper hopping from the tray.

tray : TRAY1, TRAY2, FEEDER

A jam occurred during paper ejecting.

tray : TRAY1, TRAY2, FEEDER, MANUAL

Paper of improper size is being fed from the tray.

tray : TRAY1, TRAY2, FEEDER, MANUAL

The tray has run out of paper.

tray : TRAY1, TRAY2, FEEDER

Loading of paper indicated by the first line message is

requested. The paper size may be one of the followings:

tray : TRAY1, TRAY2, FEEDER

Paper : LETTER, EXECUTIV, LEGAL 14, LEGAL 13, A4

SIZE, A5 SIZE, A6 SIZE, B5 SIZE, COM-9, COM

-10, MONARCH, DL ENV, C5 ENV

Manual loading of paper indicated by the first line message

is requested. The paper size one of the followings:

LETTER, EXECUTIV, LEGAL 14, LEGAL 13, A4 SIZE, A5

SIZE, A6 SIZE, B5 SIZE, FREE SIZE, COM-10, MONARCH,

DL ENV, C5 ENV

(The indicate rotate)

(The indicate rotate)

Table 6-1 (5/9)

40718401TH Rev.5 93 /

Category LCD status message Problem or status Remedy

Buffer overflow

Daily status

– Press the operator panel

RECOVER

key on the op-

erator panel to release the error display.

– Change the setting of the host or printer so that the

host can detect the busy status of the printer. Re-

send the data from the host to the printer.

– Replace the interface cable or main control board.

– Press the

RECOVER

key to release the error display.

– Install additional optional RAM board or reduce the

print data.

– Press the

RECOVER

key on the operator panel to re-

lease the error display.

– Simplify page data formatting.

Normal operation.

REC BUFF

OVERFLOW

MEMORY

OVERFLOW

PRINT

OVERRUN

OFF-LINE

emulate

ACTIVE

PRINTING

DATA

emulate

The receive buffer is overflowing.

The page buffer is overflowing because it received too much

data for printing on the page.

Macro buffer is overflowing.

The DLL buffer is overflowing.

The printer overrun because the print data is too complicated

to be printed.

The printer is in the off-line mode. The second line indicates

the emulation.

emulate : AUTO, PCL, PPR, FX, HEX

The printer is processing data.

The printer is printing a page.

The printer is processing data in the on-line mode.

Ready ON : The data that is not printed remains in the

buffer.

Ready flashing : The printer is receiving data or in printing

process.

emulate : AUTO, PCL, PPR, FX, HEX

Table 6-1 (6/9)

40718401TH Rev.5 94 /

Category LCD status message Problem or status Remedy

Daily status

(continued)

Normal operation.

PRINT

FONTS

PRINT

MENU

INITIAL-

IZING

FMLOADING

FM ERROR

PRINT

DEMO

All fonts of the printer are being printed during self-test.

The current menu setting is being printed.

Ready ON : Executed by command entry.

Ready flashing : Executed by key operation.

Message displayed when the power is turned on. When the

power is turned on, the LEDs are turned on for approximate-

ly 1 second, conducting a test to verify the conditions of the

LEDs and LCD.

Message displayed to indicate that the controller is undergo-

ing an initialization when the power is turned on.

This message is displayed after the turning on of the LEDs

as described above.

Indicates in Cold mode due to downloading to flash memory.

Indicates that an error occurs during downloading to flash

memory or deleting.

The demo page is being printed.

Ready LED on : Executed by command entry.

Ready LED blinking : Executed by key operation.

Table 6-1 (7/9)

40718401TH Rev.5 95 /

Category LCD status message Problem or status Remedy

Daily status

(continued)

Normal operation.

Replace the toner cartridge.

Replace the power supply/sensor board.

nnn/mmm

PRINT

CLEANING

CLEANING

MANUAL#

RESET

RESET

TO SAVE

TONERLOW

TONERSNS

When the number of copies being printed is two or more, the

number of copies being printed is displayed.

This massage is displayed together with another message

on the first line.

nnn : Current page

mmm : Total page

This message is displayed when the printer is performing

the cleaning print.

Manual loading of paper indicated by the second line mes-

sage is being reequested for cleaning. The paper size(#)

may be one of the following:

# : LETTER REQUEST, A4 SIZE REQUEST

The data which remained unprinted in the buffer is delet-

ed and the printer is initialized to user default settings.

The temporary DLLs, macros and user pattern are deleted.

This message is displayed when the printer cannot reset

automatically to exit from the menu because there are date

and DLL's and macros having temporary attributes when

the printer is changed from set mode to another mode.

Toner is running out.

This message is displayed together with another message on

the first line.

Normal operation can be continued.

A fault occurred with the toner sensor.

This message is displayed together with another message on

the first line.

Normal operation can be continued.

(The indicate rotate)

Table 6-1 (8/9)

40718401TH Rev.5 96 /

Category LCD status message Problem or status Remedy

Daily status

(continued)

Normal operation.

TONEREMP

TONEREMP

CHG CART

PWR SAVE

CHG DRUM

EEPROM

RESET'NG

ROM-SIMM

ERROR

Displays that the amount of toner is near empty (this sta-

tus will appear after 100 sheets from a TONER LOW indi-

cation).

It is indicated by being combined with other messages in

the first line.

Normal operation can be continued.

Displays that the amount of toner is near empty.

After 100 sheets from a TONER LOW indication, this sta-

tus will appear and the printing be stopped.

If pressing ON-LINE SW, other 31 sheets can be printed

and stopped. And from the next time on, the printing is

stopped each sheet.

The printer is in the power -saving mode.

This message is displayed together with another mes-

sage on the first line.

Informs drum life end. It can be temporarily released by

opening and closing the cover or pressing the “ON LINE”

switch, but basically, the drum must be replaced.

Indicates an error from the result of checking EEPROM ID

No. The printer will display this for a few seconds and re-

set the EEPROM to the factory default for a continuous

operation. It will occur with a new EEPROM.

Reformat error including CPCMCIA header of ROM-S-

IMM and byte sum.

It will be displayed for 2 seconds at power-on or just be-

fore a shift to ON LINE.

Table 6-1 (9/9)

40718401TH Rev.5 97 /

6.5.2 LCD Message Troubleshooting
If the problems cannot be corrected by using the LCD status message/problem list, follow the

troubleshooting flowcharts given here to deal with them.

No.

1.

2.

3.

4.

5.

6.

Trouble

The printer does not work normally after the power is turned on.

Flowchart number

1

Jam alarm

Paper input jam
Paper feed jam
Paper exit jam

Paper size error
Fusing unit error

2

2

2

3

4

SSIO (Synchronous Serial Input/Output) error I/F timeout
(no response) between the printer and an optional tray
(High Capacity Second Paper Feeder, Power Envelope Feeder).

Fan error

5

6

-1

-2

-3

40718401TH Rev.5 98 /

1 The printer does not work normally after the power is turned on.

• Turn the power off, then back on.

• Is all black message being displayed by the LCD display?

■■■■■■■■

■■■■■■■■

• No Is the AC cord being connected properly?

• No Connect the AC cord properly.

• Yes Is +5 V being applied between Pins 11 and 21 of POWER connector on the main control
board?

Pin 21 : 0 V
Pin 11 : +5 V

A

• No Is the connection between POWER connector on the main control
board and connector CN3 on the power supply/sensor board being
made properly?

No Correct the connection.

• Yes Go to 1-1.

• Yes Is +8 V being applied between Pins 23 and 24 (GND) of POWER connector?
Pin 23 : 0 V
Pin 24 : +8 V

• No Go to A

• Yes Is the flexible cable for the operator panel assy being connected to the PANEL connector

on the control board and the connector CN1 on the OLCC board properly?

• No Connect the flexible cable properly.

• Yes Replace the operator panel assy or flexible cable.

• Has the problem been solved?

• No Replace the main control board.

• Yes End

• Yes Is message being displayed by the LCD display?

INITIAL­IZING

• No Replace the main control board.

• Yes Is message being displayed by the LCD display?

ON-LINE

XXX

XXX: PCL, Auto, Adobe PS, HEX DUMP, PPR, FX

• No Take actions according to the LCD status message/problem list (see Section

6.5.1 for corrective actions).

• Yes End

40718401TH Rev.5 99 /

1-1

• Take the measurement of the following voltage readings at connector CN2 on the power supply/
sensor board:

Voltage between Pins 1 and 3: ... about 40 V AC
Voltage between Pins 5 and 6: ... about 9.2 V AC
Are the voltages within the normal range?

• Yes Is fuse F3 on the power supply/sensor board blown?

• No Replace the power supply/sensor board.

• Yes Replace fuse F3 (if it blows again, check the resistance of the registration and main/
drum motors. If it is faulty, replace motors or replace the power supply/sensor board or
main control board).

• No Is the AC input voltage output between Pins 1 and 2 of connector CN1 on the power
supply/sensor board normal?

• Yes Replace the AC transformer.

• No Is fuse F1 or F2 on the power supply/sensor board blown?

• Yes Replace blown fuse F1 or F2 (if is blows again, replace the power supply/sensor board).

ACIN

L
FG
N

Fuse Ratings

AC Input

Fuse

F1
F2

F3

• No Replace the power supply/sensor board.

Power supply/sensor board

CN1 CN2

F1

Filter

Circuit

F2

1

2

Thermal Fuse

120 V 230 V

125 V 6.3 A
125 V 1.6 A

125 V 3.15A

250 V 5 A

–

250 V 2.5A

AC Transformer

1, 2

3, 4

6

5

F3

±

8 Rectifying/
Smooting

Circuit

+38 V

Smoothing

Circuit

+5 V

Stabilizing

Circuit

+38 V

+8 V

-8 V

+5 V

0 V

CN3

17, 18
11, 12

9, 15, 16

24

22

Figure 6-1 Low-voltage Power Supply Block Diagram

40718401TH Rev.5 100 /