OKI OKIPLATE 904PSIII, OKIPROOF 905PSIII Service manual

OKIPLATE 904PSIII

OKIPROOF 905PSIII

Maintenance Manual

1999. 3. 4 Rev. 2

40801701TH Rev.2 1 / 122

Rev.No. Date Corrected items Person in

No. Page Description of change change

2 1999.3.4 4.1.2 67 Revision of Table E1 Miyazaki

40801701TH Rev.2 2 / 122

2 /

Introduction

This manual, intended for maintenance personnel, describes the machine maintenance methods in its field. For handling and operating, see the “Users Manual”. The unit names are referred to as follows.

OKIPLATE 904PSIII .........................OP904

OKIPROOF905PSIII .........................OP905

*Difference of OP904 from OP905 is in

Controller Board (Board Same, only RAM Capacity Different); LED Head, Mechanism Control Board (Board and ROM Different),

and their print engine blocks are the same.

Note:

40801701TH Rev.2 3 /

• All or any part of the contents is not allowed to be reproduced without permission from the owner of copyright.

• The contents are subject to change due to improvements in the machine or the description in the manual itself without notice.

Contents

1. Configuration................................................................................................................... 7

1.1 System Configuration............................................................................................................................7

1.2 Printer Configuration .............................................................................................................................8

1.3 Specification..........................................................................................................................................9

1.4 Printer Indication .................................................................................................................................11

1.4.1 TÜF, CE Label ..............................................................................................................................11

1.4.2 Warning Label ...............................................................................................................................11

2. Operation Description ...................................................................................................12

2.1 Circuit Operation Description ..............................................................................................................14

2.1.1 Controller ......................................................................................................................................14

2.1.1.1 Hardware Configuration ..........................................................................................................14

2.1.1.2 Circuit Operation Description ..................................................................................................15

2.2 Power/Sensor Board ...........................................................................................................................16

2.3 Electrophotographic Process Mechanism...........................................................................................17

2.3.1 Operation Description of Each Process ........................................................................................19

2.4 Paper Jam Sensing.............................................................................................................................26

2.5 Cover Open State ...............................................................................................................................26

2.6 “Toner-low” Detection .........................................................................................................................27

2.7 Paper Size Sensing ............................................................................................................................27

3. Parts Replacement........................................................................................................28

3.1 Parts Replacing Precautions...............................................................................................................28

3.2 Parts layout .........................................................................................................................................30

3.3 Parts Replacing Methods ....................................................................................................................35

3.3.1 Face-up Stacker Assy...................................................................................................................36

3.3.2 Contact Assy.................................................................................................................................37

3.3.3 DC Fan Motor ...............................................................................................................................38

3.3.4 Operator Panel Assy.....................................................................................................................39

3.3.5 SRA-PCB .....................................................................................................................................40

3.3.6 Stacker Cover Assy, DC12V Fan Motor, Damper Arm .................................................................41

3.3.7 Damper .........................................................................................................................................43

3.3.8 Eject Roller Assy ...........................................................................................................................44

3.3.9 Separation Piece (Sticky)..............................................................................................................45

3.3.10 FF Roller Assy, Bearing F ...........................................................................................................48

3.3.11 Paper Feed Motor .......................................................................................................................49

3.3.12 Resister Roller Assy....................................................................................................................50

3.3.13 Main Motor, Resister Motor.........................................................................................................51

3.3.14 Fuser Assy ..................................................................................................................................53

3.3.15 Fusing guide ...............................................................................................................................54

3.3.16 Back-up Roller ............................................................................................................................55

3.3.17 Hopping Roller Assy ...................................................................................................................56

3.3.18 Power Supply..............................................................................................................................57

3.3.19 Paper End Lever .........................................................................................................................58

3.3.20 Detector Spring, LLSW-PCB (First Tray) ....................................................................................59

3.3.21 LED Head ...................................................................................................................................60

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Contents

3.3.22 Paper Cassette ...........................................................................................................................61

3.3.23 Transfer Roller, TR Gear, TR Bearing ........................................................................................62

3.3.24 Feeding Roller.............................................................................................................................63

3.3.25 Detector Spring, LLSW-PCB (Second Tray)...............................................................................64

4. Adjustment ....................................................................................................................65

4.1 LED Head Driving Time Set-up...........................................................................................................65

4.1.1 Outline of Set-up Procedure .........................................................................................................66

4.1.2 Driving Time Set-up ......................................................................................................................67

4.2 Fuser Counter Reset (only OP905) ....................................................................................................69

5. Routine Maintenance ....................................................................................................70

5.1 Routine Replacement Parts ................................................................................................................70

5.2 Cleaning..............................................................................................................................................70

5.2.1 LED Lens Array Clearning ...........................................................................................................70

6. Troubleshooting Produre...............................................................................................72

6.1 Prior to Repairing ................................................................................................................................72

6.2 Check Points prior to Handling Imperfect Image ................................................................................72

6.3 Precautions on Handling Imperfect Image..........................................................................................72

6.4 Preparation for Troubleshooting .........................................................................................................73

6.5 Troubleshooting Methods ...................................................................................................................73

6.5.1 LCD Status Message List .............................................................................................................73

6.5.2 LCD Message Troubleshooting ....................................................................................................77

6.5.3 Imperfect Image Troubleshooting .................................................................................................85

6.5.4 Manual Feed Hopper Assy Opening/Closing Troubleshooting .....................................................94

7. Connection Diagram .....................................................................................................95

7.1 Connection Diagram ...........................................................................................................................95

7.2 Board Layout.......................................................................................................................................99

8. Interface Specification.................................................................................................104

8.1 Interface Specification.......................................................................................................................104

8.1.1 Centronics Interface Specification ..............................................................................................104

8.1.2 Centronics Interface Connector and Cable.................................................................................104

8.1.3 Centronics Interface Level ..........................................................................................................104

8.1.4 Centronics Interface Circuit.........................................................................................................105

8.2 RS232C Interface Specification ........................................................................................................107

8.2.1 RS232C Interface General..........................................................................................................107

8.2.2 RS232C Interface Connector and Cable ....................................................................................107

8.2.3 RS232C Interface Level..............................................................................................................107

8.2.4 RS232C Interface Circuit ............................................................................................................108

8.2.5 RS232 Interface Signal ...............................................................................................................108

8.3 RS422A Interface Specification ........................................................................................................109

8.3.1 RS422A Interface General..........................................................................................................109

8.3.2 RS422A Interface Connector and Cable.....................................................................................109

8.3.3 RS422A Interface Signal.............................................................................................................110

8.4 AppleTalk® Interface Specification ....................................................................................................111

8.4.1 AppleTalk® Interface General.....................................................................................................111

8.4.2 AppleTalk® Interface and Connector...........................................................................................111

8.4.3 AppleTalk® Interface Level ..........................................................................................................111

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Contents

8.4.4 AppleTalk® Interface Circuit ........................................................................................................111

8.4.5 AppleTalk® Interface Signal ........................................................................................................112

8.5 Parallel Interface Specification..........................................................................................................113

8.5.1 Electrical Conditions ...................................................................................................................113

8.5.2 Timing Chart ...............................................................................................................................114

9. Component Parts List..................................................................................................115

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1. Configuration

Controller Block

Centronics

RS232C

Appletalk

RS422A

Ethertalk

Main Control Board

1750MB HDD

Expansion RAM

Board

16MB

Operator

Panel

Engine Block

136 Roman Fonts

EtherTalk

Board

100/10

Base-TX

Engine Control Board

OP905 : Engine

(A3/1200dpi/10ppm)

OP904 : Engine

(A3/600dpi/12ppm)

First Tray

Front Feeder

Second Tray

Power Supply

AC IN

1.1 System Configuration

This unit consists of a control block and an engine block as standard. (See Figure 1-1.)

1. Configuration

Figure 1-1

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1.2 Printer Configuration

The internal part of the printer consists of the following parts.

• Electrophotographic Processor

• Paper Feeder

• Control Block

• Operator Panel

• Power-supply Unit

Figure 1-2 shows the printer unit configuration. Only in ML905, the LED head and the circled cover parts differ from those of others.

OP905

1. Configuration

OP905

Figure 1-2

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1.3 Specification

(1) Type Desk Top Type

(2) External Dimensions Height 317mm

(Excluding protrusion) Width 498mm

Depth 430

(3) Weight 30kg (OP904), 28kg (OP905)

(4) Development Method Dry Electrophotography

Exposure Method LED Head Method

(5) Paper

1. Configuration

Type Size Thickness Texture

Plain Paper

Thick Paper

Special Paper

105 x 148mm to 328 x 453mm 148 x 210mm to 328 x 453mm

148 x 210mm to 328 x 453mm

105 x 148mm to 328 x 453mm

297 x 488mm

to 340 x 505mm

20lb to 28lb

28lb to 32lb

Appointment paper Vertical

Vertical

Paper Feed Method

First Tray

Second Tray

Front Feeder

Remark

Use Face-up Stacker.

(6) Printing Speed First Printing 16 sec

Consecutive Printing 12 copies/min. (A4 Horizontal) Warm-up Time 2 min

(AC230V, Ambient Temperature 25°C)

(7) Paper Feed Method Automatic Paper Feed Method, Manual Feed Method (8) Paper Delivery Method Face-down, Face-up

(9) Resolution 600 x 600 dot/inch (OKIPLATE 904PSIII)

1200 x 1200 dot/inch (OKIPLATE 904PSIII)

(10) Power Input AC230V

(11) Power Consumption Maximum Average

During operation 1100W or less Approx. 400W Heater off 45W

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(12) Temperature, Humidity

Temperature Humidity

During operation

10 to 32°C 20 to 80%RH (Relative Humidity)

In storage -23 to 43°C 10 to 90%RH (Relative Humidity) No condensation detected.

1. Configuration

Note:

In storage, a packaged condition is required and the period shall not exceed one year.

(13) Noise During operation 53dB(A) or less

In standby time 45dB(A) or less

(14) Consumables Life Toner Cartridge Approx. 5,000 copies

(A4 5% duty consecutive printing. Except for the life of the first toner cartridge to be set to a new drum.)

Drum Cartridge Approx. 10,000 copies

(A4 consecutive printing)

40801701TH Rev.2 10 /

1.4 Printer Indication

1.4.1 TÜF, CE Label

The following parts of the printer are labeled TÜF, CE.

Such as

1. Configuration

1.4.2 Warning Label

Warning indications are given at the places hazardous to human bodies. Pay attention to the warnings and take precautions carefully while at work.

40801701TH Rev.2 11 /

2. Operation Description

This unit consists of a control board, a power/sensor board, an operator panel, and an electrophotographic process mechanism. Print data is received from the host interface. They are decrypted and edited before sequential storing in memory. When editing one page of data is finished, font memory referring is performed and bit images are generated in the same memory. Concurrently, the bit images are from time to time transferred to the LED head by dot line and printed on paper by the electrophotographic process mechanism.

The operator panel operates the device and displays the status.

Figure 2-1 shows the block diagram of the device.

40801701TH Rev.2 12 /

SIMM SIMM

ABT373x2 ABT373x2

(Even) (Odd)

Regident DRAM

(16Mbitx8)

(904/905)

(Even) (Odd)

CODE ROM

512K word x 16

x 2

CODE ROM

512K word x 16

x 2

F244x3

F158x3

FCT16543

F245x3

F373x3

F244x2

F244x4

FONT ROM

ATC1284x2

EEPROM

3.5" HDD

(EIDE)

RS232C I/F

Centro I/F

12PPM PRINT UNIT

A3 / 600dpi :OP904

A3 / 1200dpi :OP905

AppleTalk/RS422I/F

100Base-TX

10Base-TX

Address BUS

Data BUS

Command ROM

Address Generation

DRAM Controller,

Refresh, Access

Sequencer

NEC G/A 240pin

uPD65806GN-136-LMU

LS374

85C30

SCSI

NEC G/A 240pin

uPD68806GN-136-LMU

I/O Access Controller

Engine I/F(VIDEOI/F)

Operator Panel,

Command I/F

Operator Panel

Mechanism

Control

POWER UNIT

First Tray 250 sheets

Second Tray 250 sheets

Peripheral Data BUS

NIC Controller

MPD70236

ROM 1MByte

RAM 512KByte

Dualport

RAM

Z80181

ROM 512Kbit

RAM 256Kbit

Am29040-50KC

(Clock 50MHz)

Redident SIMM

16M Byte x 2 (905)

8M Byte x 2

2. Operation Description

Figure 2-1 Block Diagram

40801701TH Rev.2 13 /

2. Operation Description

2.1 Circuit Operation Description

2.1.1 Controller

The main control board of the OP900’s controller is a printer controller designed for a postscript. The controller has a high-performance RISC processor Am29040, 32-megabyte RAM (64 megabytes for OP905), ROM, a RS-232C port, an AppleTalk TM port, a parallel transmission port, a printer unit interface port, and 512-byte EEPROM.

This controller is designed so as to connect to an OKI A3 engine and has an OKI standard printer interface.

In this controller, PostScript is used to print images read in a “Text,” a “Graphics,” and a scanner. All the print files which the controller handles are generated by PostScript programs. PostScript enables graphics image processes, general program flow control, and data structures.

2.1.1.1 Hardware Configuration

The OP904 and OP905 controllers consist of the following circuit blocks in rough.

(1) RISC Processor (2) RAM (3) Program ROM (4) Font ROM (5) Printer Interface (6) Communication Interface (7) Operator Panel Interface

40801701TH Rev.2 14 /

2.1.1.2 Circuit Operation Description

(1) CPU Peripherals

Element Used : AMD-made Am29040-50KC CPU Operation Clock : 50MHz Timer : Timer with built-in CPU is used.

(2) Memory Peripherals

(a) RAM

Element Used : Equivalent to HM514400ZP-8 Access : Operation in “High Speed Page” Mode

RAS Inactive only in performing Miss Hit or Refresh.

Refresh Control : CAS before RAS

1024 Refresh/Approx. 10.49mS Controlling by G/A #1 3 wait (in Miss Hit) 0 wait (in Burust Access)

2. Operation Description

OP905 and OP904 have eight banks of tatal 64-megabyte storage and four banks of total 32megabyte storage, at eight megabytes per bank unit, respectively.

(b) Program ROM

Element Used : Equivalent to 27C852-12

Access time 120nS or less is required. 0 wait (in Burust Access) 0 wait or 1+1 wait (except for Burust)

A 32-bit width or one word is generated with two units because the program ROM is 16-bit wide.

Element Used OP904 : 32M-MASK x 2 + 8M-MASK x 2

OP905 : 32M-MASK x 2 + 8M-MASK x 2

(d) Resident EEPROM

Element Used : Equivalent to X2404(Xicor) Capacity : 8bit x 256word x 2page

EEPROM is used for data memorizing as fixed memory. Batteries are not required. Menu set-up values and other data are borne in memory.

40801701TH Rev.2 15 /

2. Operation Description

Sensor

Inlet Sensor 1

Inlet Sensor 2

Inlet Sensor 3

Paper Sensor

Outlet Sensor

Paper End Sensor

Toner Sensor

Functions

When paper is loaded, the leading part of paper is detected to obtain a supervision timing for switching from a hopping operation to a feeding operation. Also paper feeding and its size are monitored accordong to paper arrival and running time.

Paper Width Check

The leading part of paper is detected. Paper feeding is monitored.

Paper feeding and its size are monitored based on paper arrival and running time.

The paper end is detected.

Toner-low is detected.

Sensing State

ON : Paper exists. OFF : No paper exists.

ON : A4 size or larger OFF : A4 size or smaller

ON : B4 size or larger OFF : B4 size or smaller

ON : Paper exists. OFF : No paper exists.

ON LONG : Toner is low. ON SHORT : Toner exists.

2.2 Power/Sensor Board

This board consists of an AC filter circuit, a low voltage power supply circuit which supplies power to the control system, a high voltage power supply circuit which supplies power to the electrophotographic process system, a heater driver circuit, and a photosensor for the paper feed system and toner detection use.

Figure 2-2 shows the sensor layout.

Paper Feeding Direction

Eject Roller

Outlet Sensor

Heat Roller

Transfer Roller

Paper Sensor

Toner Sensor

Inlet Sensor 3

Paper End Sensor

Inlet Sensor 2

Resist Roller

Inlet Sensor 1

Hopping Roller

Figure 2-2 Sensor Layout

40801701TH Rev.2 16 /

2.3 Electrophotographic Process Mechanism

(1) Electrophotographic Process

The following is the outline of the electrophotographic process.

1 Charging

Applying DC voltage to the CH roller charges the surface of the OPC drum evenly in negative.

2 Exposure

Light from the LED head is directed onto the surface of the negatively charged OPC drum. The emitted parts of the drum surface attenuates in the surface potential and electrostatic latent images are generated according to image signals.

3 Development and Recovery of Residual Toner

Negatively charged toner contacts the OPC drum. With static, the toner is fixed on the electrostatic latent images on the drum and changed into its visible images. At the same time, residual toner on the drum is drawn to the developing roller with static.

2. Operation Description

4 Transfer

The toner is drawn on paper with static by laying the paper on the OPC drum surface and applying a positive charge opposite to the toner polarity to the back of the paper by the transfer roller.

5 Cleaning

The cleaning roller draws the residual toner on the OPC drum with static after the transfer and then returns it to the drum.

6 Fusing

Applying heat and pressure fuses post-transfer unfixed toner images on the paper.

40801701TH Rev.2 17 /

2. Operation Description

(2) Paper Feeding Motor

48-step/rotation pulse motor. Two-phase excited driving is made based on signals from the control board. The hopping roller for the first tray and the front feed roller are driven via two one-way clutches according to each motor rotating direction.

(3) Resister Roller

48-step/rotation pulse motor. Two-phase excited driving based on signals from the control board drives the resister roller.

(4) Drum Motor

96-step/rotation pulse motor. Two-phase excited driving based on signals from the cotrol board changes into motive power of the mechanism.

(5) LED Head

The shift/latch resister receives images by dot line from the control board and 76,800 (600dpi Head), 15,360 (1200dpi Head) of LEDs are driven to emit onto the image drum.

(6) Fuser

A heater, a heat roller, a thermistor, and a thermostat constitute the fuser. The power/sensor board supplies AC voltage to the heater based on signals (HRATON) from the control board to heat the heat roller, while the control board supervises the heat roller temperature via the thermistor and sets on/off the heater AC voltage supply to keep the even temperature. An extraordinary rise in temperature of the heat roller causes the thermostat in the heater voltage supply circuit on and cuts off the AC voltage supply by force.

40801701TH Rev.2 18 /

2.3.1 Operation Description of Each Process

• Hopping Hopping switches between the first tray and the front feeder paper feeding by the following mechanism:

Idle Gear A

One-way Clutch Gear B

2. Operation Description

Paper Feed Motor (Pulse Motor)

a b

Hopping Roller (Front Feeder)

FF Plate

Hopping Roller (First Tray)

(1) Paper Feeding from First Tray

Idle Gear B

Resister Roller

One-way Clutch Gear A

Figure A

1 Figure A shows that the paper feed motor rotates in the “a” direction (CW direction) to drive the

hopping roller and paper is fed until the inlet sensor is on. While the front feeder gear is also revolving then, the FF roller is not turned by the one-way bearing.

2 After the paper turns the inlet sensor on, feeding a certain quantity of further paper runs the paper

against the resister roller. (This corrects a skew of paper.)

40801701TH Rev.2 19 /

(2) Paper Feeding from Second Tray

Idle Roller

Planet Gear

Paper

Feeding Gear (One-way Clutch Gear)

Feeding Roller

Hopping Gear (One-way Clutch Gear)

Hopping Roller

Paper Feed Motor

Idle Gear

2. Operation Description

1 Hopping

The pulse motor rotates in the “a” direction (CW direction) to drive the hopping roller and feeding roller.

2 Feeding

When hopping is finished, the pulse motor rotates in the “b” direction (CCW direction) to drive the feeding roller. While the hopping gear is also revolving then, the hopping roller is not being turned by the one-way bearing.

40801701TH Rev.2 20 /

2. Operation Description

(3) Paper Feeding from Front Feeder

1 When the printer is turned on, the front feeder takes up a position to lower the FF plate.

(its home position).

2 Figure A shows that the one-way clutch gear B revolves via the idle gear to turn the FF roller and FF

cam when the paper feed motor rotates in the “b” direction (CCW direction).

3 Turning the FF cam releases the FF plate from the FF plate pressing release lever, then the FF

plate is raised by the spring. Paper on the FF plate is pressed against the FF roller. The FF roller feeds out the paper pressed. It continues until the inlet sensor is on, and a certain further quantity is moved forward to run the paper against the resister roller. (This corrects a skew of paper.)

4 While the FF roller feeds the paper, the FF cam turns and presses down the FF plate. When the FF

plate lowers in its full, the release lever lies on the FF plate to keep the plate uchanged even if the plate is disconnected from the FF cam.

5 Feeding the paper by the resister roller turns the FF roller by rubbing against the paper. This

turning power drives the shaft and it continues until the FF cam touches the release lever to obtain a standby state for the next hopping. The one-way bearing is built into the FF roller boss. After the cam touches the release lever, the one-way bearing runs idle so as not to turn the shaft.

40801701TH Rev.2 21 /

• Feeding

2. Operation Description

OPC Drum

Paper Sensor

Transfer Roller

Pulse Motor

Paper

Resister Roller

Hoppin

Roller

1 After the hopping is finished, the resister motor rotates to drive the resister roller and paper is fed

until the paper sensor is on.

2 Further feeding is synchronized with printing data.

40801701TH Rev.2 22 /

2. Operation Description

Power

Supply

OPC Drum

Charging Roller

Power

Supply

OPC Drum

Charging Roller

OPC Drum

LED Head

Paper

(1) Charging

Charging is processed by applying DC voltage to the charging roller contacting the OPC drum surface.

(2) Exposure

Light from the LED head is directed onto the surface of the negatively charged OPC drum. The potential of the emitted parts of the OPC drum attenuates and electrostatic latent images are generated according to image signals.

40801701TH Rev.2 23 /

2. Operation Description

OPC Drum

Transfer Roller

Paper

Power Supply

(3) Development

Fixing toner on electrostatic latent images on the OPC drum surface changes the toner to its visible images. Development is processed in the contact parts between the OPC drum and the developing roller.

1 The sponge roller fixes toner on the developing roller. The toner is charged negatively then.

Developing Blade

Charging Roller

Developing Roller

OPC Drum

Sponge Roller

2 The toner on the developing roller is shaven by the developing blade to make a thin layer of the

toner on the surface of the developing roller.

3 Fixing the toner to the exposed parts of the OPC drum makes electrostatic latent images visible in

the contact parts between the OPC drum and the developing roller.

(4) Transfer

The transfer roller is made of a conductive sponge material and arranged so that paper and the OPC drum surface are well close together. A positive charge opposite to the toner polarity (negative) is applied to the back of paper by the transfer roller, laying the paper on the OPC drum surface. Applying high voltage from the power supply (positive) to the transfer roller moves a positive charge induced on the roller surface to the paper side in the contact parts of the transfer roller. A positive charge on the back of the paper moves the negative toner on the OPC drum surface to the upside of the paper. Transfering to the paper is performed by this.

40801701TH Rev.2 24 /

2. Operation Description

(5) Fusing

When passing between the heat roller and back-up roller, post-transfer unfixed toner images fuse on the paper with heat and pressure. A 800W of heater (halogen lamp) is inserted into the internal part of the teflon-coated heat roller to heat the heat roller. Also a thermistor moves over the surface of the heat roller and controls the temperature to keep it constant. In addition, thermostat, which is open for the duration of a temperature rise to break voltage supply to the heater, is attached for safety. The pressure springs on both sides press the back-up roller.

Separation claw

Heater

Pressure Spring

Heater roller

Thermistor

Back-up roller

(6) Cleaning

After the transfer, the cleaning roller draws the non-transferred residual toner on the OPC drum with static and then returns it to the OPC drum. Also the CH cleaner negatively charges positive toner on the charging roller to return the toner from the charging roller to the OPC drum.

OPC Drum

Cleaning Roller

Power supply

40801701TH Rev.2 25 /

+DC

Transfer Roller

2. Operation Description

2.4 Paper Jam Sensing

Paper states are monitored when power is turned on and while printing. If any one of the following events occurs, the print processing is suspended as a paper jam. Removing the jammed paper (Cover open/Remove/ Cover close) processes recovery printing.

Error Error Condition

Paper Input Jam "PAPER LOAD JAM"

Paper Feed Jam "PAPER FEED JAM"

Paper Outlet Jam "EJECTION JAM"

Paper Size Error "PAPER SIZE ERROR"

•

The leading part of paper does not reach Inlet Sensor after three times of hopping at paper loading.

•

Paper exists on Inlet Sensor or Paper Sensor when power is turned on.

•

The leading part of paper does not reach Paper Sensor within a certain time after passing Inlet Sensor.

•

The leading part of paper does not reach Ejection Sensor within a certain time after passing Paper Sensor.

•

Paper does not pass Inlet Sensor within the specified time.

•

Paper exists on Outlet Sensor when power is turned on.

•

Paper does not pass Outlet Sensor within the specified time.

•

Inlet Sensor and Outlet Sensor monitor the paper running time each and detect a size difference of 45mm or more between paper used and the tray-set paper.

•

A paper width detected by Paper Width Sensor is different from the trayset one. (Paper Width Sensor detection is applicable to the paper size B4 or larger, and A4 or smaller.)

2.5 Cover Open State

Opening the stacker cover turns the cover opening microswitch on the power/sensor board off and cuts off 38V supply to a high voltage supply to stop all high voltage lines output. Concurrently, CVOPN signals inform the control board of the switching state and cover open processing is performed.

40801701TH Rev.2 26 /

2. Operation Description

2.6 “Toner-low” Detection

When toner is low, the lever reaches the magnet position of the toner sensor soon. In a tonerful state, the lever moves almost as fast as the stirring roller turns.

Internal Stirring Roller of EP

Lever

Magnet

Toner Sensor

TNRSNS

On Off

Toner-low State : t>T/4 Tonerful State : t<T/4

Toner Replacing Alarm and Toner Life Alarm Detection Sequence

(1) Two consecutive toner-low states give a toner replacing alarm. (2) Processing 100 pages of printing at toner replacing alarming gives a toner life alarm. (3) Two consecutive tonerful states in toner replacing alarming cancel a toner replacing alarm.

Note:

If the drum motor is not rotating, the toner sensor monitoring is not executed.

2.7 Paper Size Sensing

T=6.1 sec

Four tab pieces are driven according to setting positions of the paper guide, through the cam linked with the paper guide of the paper cassette.

When the paper cassette is attached to the printer, the microswitch detects a state of tab pieces to recognize a paper size.

Microswitchin Prosess

Paper Size

SW1 SW2 SW3 SW4

Letter Executive A4 Legal 14 B5 Y A5 B4 A3 A3 Nobi A4 Y

40801701TH Rev.2 27 /

3. Parts Replacement

Disconnect

Reconnect

OFF

3. Parts Replacement

This section describes the procedure for replacing the parts, assemblies, and units in the field. Although the replacing procedure is for detaching, the reverse procedure must be used for attaching them.

3.1 Parts Replacing Precautions

(1) Never fail to disconnect the AC cable and the interface cable before replacing the parts.

(a) Detach the AC cable by using the following procedure.

1 Switch the POWER of the printer off to “O”. 2 Pull the AC inlet plug of the AC cable out of the AC receptacle. 3 Pull the AC cable and the interface cable out of the printer.

(b) To re-connect to the printer, use the following procedure.

1 Connect the AC cable and the interface cable to the printer. 2 Connect the AC inlet plug to the AC receptacle. 3 Switch the POWER of the printer on to “I”.

(2) Do not disassemble as long as the printer operates normally. (3) Disassemble at a minimum if necessary. (Any parts except the parts described in the replacing

procedure are not allowed to be detached.)

(4) Use the designated maintenance tools. (5) To disassemble, follow the procedure instructed. Disassembling in an incorrect order may damage

the parts.

(6) Small parts such as screws and collars likely to be lost shall be fixed to the original positions temporarily. (7) In handling ICs and boards such as microprocessors, ROM, RAM, do not use gloves apt to get static. (8) The print board shall not be put on any device and directly on the floor.

40801701TH Rev.2 28 /

[Maintenance Tools]

Table 3-1 shows tools necessary to replace the parts.

Table 3-1 Tools for Maintenance

No. Q' ty Use for RemarkService Tools

3. Parts Replacement

Driver No.1-100

Driver No.2-200

Driver No.3-300

Driver No. 5-200

Digital multimeter

Pliers

Handy Cleaner

LED Head cleaner

Drawing No: 4PB4083-2248P1

Jack-in Connector Pulling Tools

Drawing No: 4PP4076-5395P1

2~2.5 mm screws

3~5 mm screws

LED Head Cleaning

Jac-in Connector Pulling

40801701TH Rev.2 29 /

3.2 Parts layout

This section describes the layout of the main parts.

3. Parts Replacement

Figure 3-1

40801701TH Rev.2 30 /

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