Sharp AR-C265P Service Manual

SERVICE MANUAL

COLOR LED PRINTER

MODEL AR-C265P

CONTENTS

CHAPTER 1 CONFIGURATION ......................................... 1-1

CHAPTER 2 EXPLANATION OF OPERATION.................. 2-1

CHAPTER 3 INSTALLATION ............................................. 3-1

CHAPTER 4 REPLACEMENT OF PARTS ......................... 4-1

CHAPTER 5 MAINTENANCE MENUS ............................... 5-1

CHAPTER 6 PERIODICAL MAINTENANCE ...................... 6-1

CHAPTER 7 TROUBLESHOOTING PROCEDURES ........ 7-1

CHAPTER 8 CONNECTION DIAGRAMS........................... 8-1

SHARP CORPORATION

This document has been published to be used for after sales service only. The contents are subject to change without notice. Please Reorder: SM-ARC265P September 2006

INTRODUCTION

This manual explains the maintenance methods for the AR-C265P. The manual has been prepared for use by the maintenance personnel. For operating methods of the AR-C265P, refer to the corresponding user's manual.

Note!

• The contents of this manual are subject to changes without prior notice.

• Despite that exhaustive efforts were made in preparing the manual to make it accurate, it still may contain errors. Sharp will not hold itself liable for any damage that results or is claimed to have resulted from repair, adjustment, or modification of the printer conducted by the user using this manual.

• The parts employed in the printer are so delicate that they may be damaged if not treated properly. Sharp strongly recommends that the maintenance of the printer be undertaken by Sharp's registered maintenance personnel.

• Work after eliminating static electricity.

CONTENTS

CHAPTER 1 CONFIGURATION

I. SYSTEM CONFIGURATION .............1-1

II. PRINTER CONFIGURATION ............1-2

III. COMPOSITION OF OPTIONAL

ITEMS................................................1-3

IV. SPECIFICATIONS .............................1-4

V. INTERFACE SPECIFICATIONS........1-8

CHAPTER 2 EXPLANATION OF OPERATION

I. ELECTROPHOTOGRAPHIC

PROCESSING MECHANISM ............2-1

CHAPTER 3 INSTALLATION

I. CAUTIONS, AND DO’S AND

DON’TS..............................................3-1

II. UNPACKING METHOD .....................3-2

III. PRINTER INSTALLATION

INSTRUCTIONS ................................3-3

IV. LISTING OF COMPONENT UNITS

AND ACCESSORIES ........................3-4

V. ASSEMBLING METHOD...................3-5

A. Assembly of printer main body .....3-5

A. Parallel interface specifications

(N/A) .............................................1-8

B. USB interface specifications.........1-8

C. Network interface specifications...1-9

II. PRINTING PROCESS .......................2-6

B. Connection of power cable .........3-11

C. Installation of optional items .......3-14

D. Confirmation of recognition

of optional items .........................3-22

VI. MENU MAP PRINT..........................3-23

VII. CONNECTION METHODS..............3-24

VIII. CONFIRMATION OF PAPER

USED BY THE USER ......................3-25

CHAPTER 4 REPLACEMENT OF PARTS

I. PRECAUTIONS ON THE

REPLACEMENT OF PARTS............. 4-1

A. Maintenance tools........................ 4-2

II. PART REPLACEMENT

METHODS......................................... 4-3

A. Left side cover.............................. 4-3

B. Right side cover ........................... 4-4

C. Face-up tray................................. 4-5

D. Rear cover.................................... 4-6

E. LED assy /LED assy springs ........ 4-7

F. Control PCB ................................. 4-8

G. Print engine controller PCB.......... 4-9

H. Top cover assembly ................... 4-11

I. Top cover ................................... 4-12

J. Controller panel assy .................4-13

K. Board PRP/Top cover handle.... 4-14

L. Low-voltage power supply/

low-voltage fan/hopping

motor/fuser motor ......................4-15

M. Guide eject assy/color register

assy/board-PRY ........................ 4-16

N. Fan (fuser)/belt motor /high-voltage

power supply board/cover-open

switch ......................................... 4-18

O. MPT assy ................................... 4-19

P. Feeder unit/board-RSF /MPT

hopping roller/frame assy

separator/cover front ................. 4-20

Q. Board-PRZ lift-up motor /

solenoid/paper-end sensor ........ 4-21

R. Feed roller .................................. 4-23

S. Shaft eject assy(FU) /shaft

eject assy(FD)/eject sensor ....... 4-24

T. Fuser Unit................................... 4-25

U. Belt Unit...................................... 4-26

III. LUBRICATING POINTS.................. 4-27

CHAPTER 5 MAINTENANCE MENUS

I. SYSTEM MAINTENANCE MENU

(FOR MAINTENANCE

PERSONNEL) ................................... 5-1

II. MAINTENANCE UTILITY .................. 5-3

III. FUNCTIONS OF USER’S

MAINTENANCE MENU..................... 5-6

A. Maintenance menu (For end

users) ........................................... 5-6

B. Self-diagnostic mode.................... 5-7

IV. SETUP AFTER REPLACEMENT

OF PARTS....................................... 5-40

CHAPTER 6 PERIODICAL MAINTENANCE

I. RECOMMENDED REPLACEMENT

PARTS............................................... 6-1

II. CLEANING ........................................ 6-1

III. CLEANING OF LED LENS

ARRAY .............................................. 6-1

A. Precautions on the replacement

of engine control PCB ................ 5-40

B. Setup of EEPROM after

replacement of SP1/TBH

PCB............................................ 5-42

C. Setup of destination ...................5-44

V. ABOUT THE MANUAL SETUP

OF PRINT DENSITY

ADJUSTMENT ................................ 5-45

IV. CLEANING OF PICKUP

ROLLERS.......................................... 6-3

V. INTERNAL CLEANING OF

PRINTER........................................... 6-4

iii

CHAPTER 7 TROUBLESHOOTING PROCEDURES

I. PRECAUTIONS PRIOR TO

REPAIR..............................................7-1

II. ITEMS TO BE CHECKED PRIOR

TO TAKING ACTION ON

ABNORMAL IMAGES........................7-1

III. PRECAUTIONS WHEN TAKING

ACTION ON ABNORMAL

IMAGES.............................................7-1

IV. PREPARATIONS FOR

TROUBLESHOOTING.......................7-1

CHAPTER 8 CONNECTION DIAGRAMS

I. CHECK OF RESISTANCE

VALUES.............................................8-1

V. TROUBLESHOOTING METHOD ......7-1

A. LCD message list .........................7-2

B. Preparing for troubleshooting .....7-18

C. Image problem troubleshooting ..7-57 D. Actions after forced initialization

of HDD/Flash .............................7-65

E. Network Troubleshooting............7-66

VI. CHECK OF FUSES .........................7-67

II. COMPONENT LAYOUT ....................8-5

CHAPTER 1

CONFIGURATION

I. SYSTEM CONFIGURATION............. 1-1

II. PRINTER CONFIGURATION............ 1-2

III. COMPOSITION OF OPTIONAL

ITEMS................................................ 1-3

IV. SPECIFICATIONS............................. 1-4

V. INTERFACE SPECIFICATIONS .......1-8

A. Parallel interface specifications

(N/A)............................................. 1-8

B. USB interface specifications ........ 1-8

C. Network interface specifications... 1-9

I. SYSTEM CONFIGURATION

CHAPTER 1 CONFIGURATION

DUPLEX PCB 2nd TRAYPCB

IN1 IN2 WR

Front sensor PCB

1st

Paper feed

P. E

BELT

IDUP

HOP

solenoid

sensor

Belt unit

PUPCB

FLASH

Color

8Mbit

registration

PCB right

Belt unit

Color

registration

fuse-cut

20MHz

Color drift, density,

thermistor signal

Density

PCB left

Junction PCB

5V,24V, 0VL,0VP

EXIT

sensor

Fuser fuse-cut,

UP&LOW thermistor/frame

thermistor

Low-voltage PCB

Inlet

Unit

Fuser

FUSER

AC-SW

RFID

HDDLAN USB

CPU

CUPCB

FAN

CIF2

ASIC

ROM

Flash

CC1

K LED HEAD

Y LED HEAD

EEP

ROM

RAM

Option

ASIC

C LED HEAD

M LED HEAD

LEISUS

command I/F

DCON I/F LSYNC

Operator panel PCB

ARMORED CPU

EXIT

fuse-cut,

Belt unit

EEPROM

fuse-cut

C toner

M toner

Toner sensor PCB

Y toner

K toner

sensor

Cover-

Belt

Fuser

FAN heater control,

others

High-voltage I/F,

fan control, cover-open

open

sensor

thermi-

stor

fan

Environment

sensor

High-voltage PCB

ID UP/

DOWN

Low-

voltage

Y-ID M-ID C-ID

K-ID

FAN

1-1

CHAPTER 1 CONFIGURATION

II. PRINTER CONFIGURATION

The internal part of the AR-C265P printer is composed of the following sections:

• Electrophotographic processing section

• Paper paths

• Control sections (CU sect./PU sect.)

• Operator panel

• Power supply sections (High-voltage sect./low-voltage sect.)

1-2

Air flow

III. COMPOSITION OF OPTIONAL ITEMS

The following optional items are available for the printer:

(1) Second tray

AR-C265PFU

(530 sheet paper tray)

(2) Duplex Unit

AR-C265PADU

CHAPTER 1 CONFIGURATION

(3) Expansion Memory

AR-C265SM1 (256 MB) AR-C265SM2 (512 MB)

For long printing, it is recommended to add an expansion memory.

Hard disk

(4)

AR-C265HD (40 GB hard drive)

1-3

CHAPTER 1 CONFIGURATION

IV. SPECIFICATIONS

Division

External

dimensions

Print width

Engine speed

(A4)

First print

time(A4)

Resolution

CPU

RAM

ROM

Power

consumption

Operating

environment

(Temperature)

Operating

environment

(Humidity)

Item

Width

Depth With duplex

Without duplex

Height

Mass With duplex

Without duplex

Print width

Monochrome

Color

OHP Color

OHP color/ monochrome

Monochrome

Color

Warm-up time

Low-noise mode

LED head

Max. input resolution

Output resolution

Gradation

Econo-mode

Core

I-cache

D-cache

Clock

Bus width

Resident

Option

Program + font

Power input

Power-save mode

Idle

Normal operation

Peak

When operating

When not operating

When stored

(For max. 1 yr.)

When transported

(For max. 1 mo.)

When transported

(For max. 1 mo.)

When operating

When not operating

When stored

When transported

AR-C265P

32/26ppm

435mm

621mm

563.5,mm

340mm

Approx.29kg

Approx.26kg

32ppm

26ppm

9ppm*1

10ppm

8sec

9sec

45sec

Not applicable

600dpi

600x1200dpi

True 600x1200dpi

True 600x600dpi

600x600x4 level

Toner-saving by reducing lightness

PowerPC750CXR

32KB,

32KB (Internal L2 : 256KB)

500MHz

64bit

256 MB

256/512MB DIMM

Total capacit: 64MB

(120V)110~127VAC , (230V)220~240VAC

15W or less

100W (Average)

490W

1200W

10°C~32°C, 17°C~27°C(Full-color print quality guarantee temperature)

0°C~43°C, Power off

-10°C~43°C, With drum and toner

-29°C~50°C, With drum, but no toner

-29°C~50°C, With drum and toner

20%~80%, 50%~70%(Full-color print quality guarantee humidity)

Max. wet-bulb temp. : 25°C

10%~90%, Max. wet-bulb temp. : 26.8°C, with power off

10%~90%, Max. wet-bulb temp. : 35°C

10%~90%, Max. wet-bulb temp. : 40°C

1-4

CHAPTER 1 CONFIGURATION

Division

Service life

Operation noise

Paper handling

Paper size

Min. paper size

Item

Printer life

Print duty

(M=L/12, A=L/12/5)

MTBF

(2.3% duty)

MPBF

MTTR

Starter toner

Toner life

(5% duty)

(Attached)

Standard

With 1st

new drum

Image drum life

Transfer belt life

Fuser unit life

In operation

(ISO7779Front) In one-side print

On standby (ISO7779Front)

Power-save mode

Paper capacity(1st tray)

Paper capacity(2nd tray)

Paper capacity (Manual/auto)

Delivery

Duplex

Legal/universal or

A4-size cassette/universal cassette

Automatic front feeder

or manual feeder

Two-sided

1st tray

2nd tray

Manual & auto (MPT)

Two-sided

AR-C265P

32/26ppm

420,000 pages, 5 years

Max. 50,000 pages / mo.

Average 4,000 pages / mo.

Not applicable

40,000 pages

20 minutes

Approx. 2,000

pages (Black)

Approx. 2,000

pages (Color)

Approx. 6,000

pages (Black)

Approx. 5,000 pages (Color)

Approx. 5,200

pages (Black)

Approx. 1,200

pages (Color)

Approx.

20,000 pages (With 3 pages / job)

Approx.27

,000 pages (When printed continuously) Drum counter automatically reset

60,000 pages (A4 size, with 3 pages / job), counter automatically reset

60,000 pages (A4 size), counter automatically reset

Legal/universal cassette: 300 sheets (70kg)

Legal/universal cassette (Optional): 530 sheets (70kg)

Standerd multi-purpose tray: 50 OHP sheets or 100 sheets of paper (70kg) or 10 envelopes

250 sheets (70kg) face-down/100 sheets (70kg)face-up in tray

1st cassette: Legal13/13.5/14, letter, executive, A4, A5, B5, A6

2nd

cassette: Legal13/13.5/14, letter, executive, A4, A5, B5

Reply-paid postcard (Max. 176gsm) (Multi-purpose tray)

Legal13/13.5/14, letter, executive

1200mm (When paper length exceeds 356, its width shall be from 210 to 215.9.)

Legal13/13.5/14, letter, executive

, A4, A5, B5, A6, C5, DL, Com-9,Com-10, Monarch, custom size, banners up to

Postcard, reply-paid postcard, Japanese-style envelope

, A4, A5 Custom size (Within permissible size and weight)

105x148mm:A6/(Models for Japan [100x148: Postcard size])

100x148: Postcard size

Approx.

55.6dBA

37dBA

Background level

Standard

148x210mm:A5

12,000 pages (With 1 page / job)

1-5

CHAPTER 1 CONFIGURATION

Division

Paper thickness

Operator panel

Status

switch/sensor

Communication

interface

Item

1st tray

2nd tray

Manual & auto (MPT)

Two-sided

LCD

LED (Color)

Switch

Paper out

Paper low

Toner low

Cover open

Fuser unit temp.

Paper size

Stacker full

Standard ( On PCB)

Option for OEM user

AR-C265P

32/26ppm

64~120gsm

64~176gsm

64-203gsm OHP sheets available

64~105gsm

16 characters in 2 line (Roman alphabet/Japanese kana)

No paper size indicated

Two

(Green x1, dark amber x1)

Six

Provided

Not provided

Provided (Y,M,C,K)

Provided

Not provided

• Hi-Speed USB

• Ethernet

• Bidirectional parallel I/F conforming to IEEE std

1284-1994 (OEM)

Emulation

Font

Input/output switch

Standard

Emulation switch

Bit-map type face

Scalable 1 type face

Scalable 2 type face

Scalable 3 type face

Rasterizer

Bar code

OCR

Japanse PCL font

Japanese PS font

Automatic

PCL (PCL5c, HP-GL)

/ PCL XL2.1

SIDM (IBM-PPR,

EPSON-FX)

PostScript3 (Clone)

Automatic

Agfa

1(Line printer)

Agfa micro-type 86

Not available

Agfa micro-type 136

Agfa UFST 4.0 (PCL)

USPS

OCR-A,B

Not available

1-6

CHAPTER 1 CONFIGURATION

Division

Optional Item

(Detachable)

Factory settings

Others

Note!

Item

RAM set

Tray mechanism

Cassette

Duplex print unit

Other

Japan

USB-IF logo

Windows logo

Operation with UPS

Operation with UPS (Uninterruptible power supply) is not guaranteed.

Expansion memories for AR-C265P

AR-C265P

32/26ppm

256,512 MB

2nd tray mechanism

Legal/universal (530 sheets)

Option

2.5" IDE HDD

User- installable (40 GB hard drive)

PCL+PS model

Available

Do not use UPS

! Note

1-7

CHAPTER 1 CONFIGURATION

V. INTERFACE SPECIFICATIONS

A. Parallel interface specifications (N/A)

B. USB interface specifications

Outline of USB interface

(1) Basic specifications

USB (Hi-Speed USB supported)

(2) Transmission mode

Full speed (Max. 12Mbps ± 0.25%) High speed (Max.480Mbps ± 0.05%)

(3) Power control

Self power device

USB interface connectors and cables

(1) Connector

• Printer side: B-receptacle (Female) Upstream port Product equivalent to UBR24-4K5C00 (Made by ACON)

Connector pin assignment

• Cable side: B-plug (Male)

(2) Cables

Cable length: Specification: USB2.0 type cables five meters long or shorter. Cables two meters long

or shorter are recommended. (Shielded cable lines shall be used.)

USB interface signals

Shell

Signal name

Vbus

D-

D+

GND

Shield

Function

Power supply (+5V)

For data transfer

Signal ground

1-8

C. Network interface specifications

Outline of network interface

Basic specifications of network interface

CHAPTER 1 CONFIGURATION

Protocol family

TCP/IP

NetBEUI NetWare

Ether Talk

Network protocol Application IPv4, IPv6, TCP, UDP, ICMP, ICMPv6, ARP

NetBIOS SPX, IPX, SAP, RIP

ELAP, AARP, DDP, AEP, ZIP, RTMP, ATP, NBP

Network interface connectors and cables

(1) Connectors

100 BASE-TX / 10 BASE-T (Automatically switched, not usable simultaneously)

LPR, RAW, IPP, FTP

SMTP/POP3 HTTP HTTPS Telenet SNMPv1/v3 DHCP/BOOTP DNS UPnP Rendezvous SNTP

WINS, SMB Q-Server over IPX

Q-Server over IP R-Printer N-Printer

PAP

2) Cables RJ-45 connectorized non-shielded twisted-pair cable (Category 5 recommended)

Network interface signals

Pin No.

7 8

Signal name

TXD+

TXD-

RXD+

RXD-

Connector pin assignment

Direction

FROM PRINTER

TO PRINTER

Function

Transmitting data +

Transmitting data -

Receiving data +

Not in use

Receiving data -

Not in use Not in use

1-9

CHAPTER 2

EXPLANATION OF OPERATION

I. ELECTROPHOTOGRAPHIC

PROCESSING MECHANISM............ 2-1

II. PRINTING PROCESS....................... 2-6

CHAPTER 2 EXPLANATION OF OPERATION

I. ELECTROPHOTOGRAPHIC PROCESSING MECHANISM

(1) Electrophotographic process

The electrophotographic process is explained briefly below:

1. Charging A voltage is applied to the CH roller to electrically charge the surface of the OPC drum.

2. Exposure

The LED head radiates light onto the charged OPC drum in accordance with the image

signal. The electric charge of the radiated part of the OPC drum surface attenuates

depending on the intensity of the light, thus forming an electrostatic latent image on the OPC drum surface.

3. Development Charged toner adheres to the electrostatic latent image of the OPC drum by electrostatic

power, and forms a visible image on the OPC drum surface.

4. Transfer

Paper is placed over the OPC drum surface and an electric charge is applied to it from the back side by the transfer roller, so that the toner image is transferred to the paper.

5. Drum cleaning The drum cleaning blade removes toner remaining on the OPC drum after the transfer.

6. Removal of Electricity

7. Belt cleaning

The belt cleaning blade removes toner remaining on the belt.

8. Fuser Heat and pressure are applied to the toner image on the paper to promote its fusion.

1. Charging A voltage is applied to the charging roller, which is placed in contact with the OPC drum surface, to charge the OPC drum surface.

Charging roller

Power

Supply

Unit

OPC drum

2-1

CHAPTER 2 EXPLANATION OF OPERATION

2. Exposure The light emitted from the LED head is radiated onto the charged surface of the OPC drum. The charge of the radiated part of the OPC drum attenuates according to the intensity of the light, forming an electrostatic latent image on the OPC drum surface.

Charging roller

LED head

Power

Supply

Unit

OPC drum

Paper

LED head

OPC drum

3. Development Toner adheres to the electrostatic latent image on the drum surface, thereby turning the electrostatic latent image into a toner image.

1. The sponge roller allows the toner to stick to the development roller.

2-2

Charging roller

Sponge roller

OPC drum

Development roller

2. The electrostatic latent image on the OPC drum surface is turned into a visible image by the toner.

CHAPTER 2 EXPLANATION OF OPERATION

4. Transfer A sheet of paper is placed over the OPC drum surface, and an electric charge is given to the paper from its back side by the transfer roller. When a high voltage is applied to the transfer roller from the power source, the charge induced on the transfer roller moves on to the surface of the paper through the contact part between the transfer roller and the paper, the toner being attracted to the paper surface from the OPC drum surface.

OPC drum

Paper

-+-

Transfer roller

-+-+-+-+-+-

Power

Supply

Transport belt

Unit

5. Drum cleaning Unfixed toner remaining on the OPC drum is removed by the drum cleaning blade and collected into the waste toner area of the toner cartridge.

Waste toner

Toner cartridge

Drum cleaning blade

ID unit

2-3

CHAPTER 2 EXPLANATION OF OPERATION

6. Removal of Electricity Electrically charge on the OPC drum surface decveases by exppsing the OPC drum surface after transfer to the light.

Board for the light of the removal of electricity

Light for the removal of electricity

Charging roller

OPC drum

7. Belt Cleaning Toner remaining on the transfer belt is scraped off by the belt cleaning blade and collected into the waste toner box of the transfer belt unit.

Transport belt

2-4

Belt waste toner box

Belt cleaning blade

CHAPTER 2 EXPLANATION OF OPERATION

8. Fuser The toner image which was transferred to the paper is applied heat and pressure as it passes between the heat roller and the backup roller, and it is therefore fused onto the paper. For the sake of safety, a thermostat is provided; it comes on to cut off the voltage supplied to the heater if the heat roller temperature rises above a certain preset temperature.

Thermostat

Thermistor

Halogen Lamp

Heat Roller

Backup Roller

Beit

Fusing Temperature Settings

Paper thickness

Thin

Thick

Paper Type Settings

Light

Medium

Heavy

U.Heavy

OHP

Paper

Pad

Thermistor

Temperature Settings

Medium temp

High temp

Medium temp

Low temp

2-5

CHAPTER 2 EXPLANATION OF OPERATION

II. PRINTING PROCESS

The paper fed from Tray 1 or Tray 2 is carried by the paper feed roller, register roller L and transport roller. When the paper is fed from the MPT, it is carried by the MPT paper feed roller and register roller U. Then, an unfixed toner image is created on the paper transported onto the belt sequentially through the electrophotographic process of KYMC. Thereafter, the image is fixed under heat and pressure as the paper goes through the fuser unit. After the image has been fixed, the paper is unloaded to the stacker either face-up or face-down stacker, according to the outputting method selected by opening or closing the face-up stacker. While the above refers to the one-sided print operation of the printer, its operation in two-sided print will be explained below. When two-sided print is conducted, the paper that has passed through the fuser unit following first one-sided print is directed into the Duplex unit by the separator DUP. After entering the paper reversal transport path, the paper is carried from there to the inside of the Duplex unit by the inverting operation of the reversal roller. Then, after passed through the Duplex unit by the transport roller that is located on the transport path inside the Duplex unit, the paper is fed along the paper feed route of the Duplex unit to eventually merge the same route that comes from the tray. From here on, the same operation as that of one-sided print of paper fed from the tray takes place.

Face-up stacker

Separator DUP

Reversal roller

Face-down stacker

Heat roller

Halogen lamp

Backup roller

Belt

Paper reversal transport path

Transport roller

Subroller

Transport belt

Subroller

MPT paper feed roller

MPT

Paper feed roller

Transport roller

2-6

Paper feed roller

CHAPTER 2 EXPLANATION OF OPERATION

(1) Paper fed from 1st Tray

1. As illustrated in Figure 2-1, when the solenoid is ON, the register motor rotates (Counterclockwise turn), transporting the paper until the IN1 sensor comes ON. (When the solenoid is ON, the paper feed roller is driven.)

2. After causing the IN1 sensor to come ON, the paper is further carried over a certain distance to finally hit register roller L. (This corrects skew of the paper.)

3. As shown in Figure 2-2, the solenoid is turned OFF and the paper is transported by register roller L. (When the solenoid is OFF, register roller L is driven.)

(Drive)

WR Sensor

Hopping Gear Assy

Solenoid Lever

(Solenoid ON)

Sub Roller

(Drive)

Hopping Roller

(Drive)

(2) Paper fed from MPT

1. As illustrated in Figure 2-3, when the solenoid is OFF, the register motor rotates (Clockwise turn), transporting the paper until the IN2 sensor comes ON. (As the register motor rotates clockwise, the MPT paper feed roller is driven.)

2. After causing the IN2 sensor to come ON, the paper is further carried over a certain distance to finally hit register roller U. (This corrects skew of the paper.)

IN2 Sensor

Registration Roller L

(Stop)

IN1 Sensor

Solenoid Lever

(Solenoid OFF)

Registration Motor

(CCW)

Paper

WR Sensor

Sub Roller

(Stop)

(Drive)

Paper

Hopping Roller

(Stop)

Figure 2-1 Figure 2-2

IN2 Sensor

Registration Roller L

(Drive)

IN1 Sensor

Registration Motor

(CCW)

3. As shown in Figure 2-4, the register motor rotates (Counterclockwise turn) to let register roller U transport the paper. (As the register motor rotates counterclockwise, register roller U is driven.)

IN2 Sensor

Registration Roller U

(Stop)

WR Sensor WR Sensor

Hopping Gear Assy

Solenoid Lever

(Solenoid OFF)

MPT Hopping Roller

Paper Paper

Hopping Gear Assy Solenoid Lever

(Solenoid OFF)

Registration Motor

(CW)

Figure 2-3 Figure 2-4

IN2 Sensor

Registration Roller U

(Drive)

Registration Motor

(CCW)

2-7

CHAPTER 2 EXPLANATION OF OPERATION

(3) Transport belt

1. As the transport belt motor rotates in the direction of the arrow, the transport belt is driven. The belt unit consists of one transport roller placed immediately underneath each color drum, with a transport belt inserted in between them. As the specified voltage is applied, the transport belt and the transport rollers send the paper located on the transport belt to the fuser unit while transferring to it the toner image present on each color drum.

Drum

Carrier belt

KYMC

Carrier (transfer) roller

Figure 2-5

Carrier (transfer) belt motor

2-8

CHAPTER 2 EXPLANATION OF OPERATION

(4) Up/down-motions of ID units

1. The up/down-motions of the ID units take place driven by the lift-up motor.

2. Figure 2-6 shows the motions of the different ID units when the printer is operated for color print. As the lift-up motor rotates (Clockwise turn), the lift-up link slides to the left, causing the ID units to come down, as can be seen in Figure 2-6. Namely, the printer is readied for color print.

3. Figure 2-7 shows the motions of the different ID units when the printer is operated for monochrome print. As the lift-up motor rotates (Counterclockwise turn), the lift-up link slides to the right, causing the ID units to go up, except for the K-ID unit, as can be seen in Figure 2-7. Namely, the printer is readied for monochrome print.

ID Unit Operations During Color Printing

C-ID Unit down

C-ID Unit

M-ID Unit down Y-ID Unit down K-ID Unit down

M-ID Unit Y-ID Unit K-ID Unit

Lift uplink

Figure 2-6

ID Unit Operations During Monochrome Printing

C-ID Unit

C-ID Unit lift up M-ID Unit lift up Y-ID Unit lift up K-ID Unit down

Lift uplink

C-ID Motor

(CCW)

M-ID Unit Y-ID Unit

K-ID Unit

Figure 2-7

C-ID Motor

(CW)

2-9

CHAPTER 2 EXPLANATION OF OPERATION

(5) Fuser unit and paper output

1. As illustrated in Figure 2-8, the fuser unit and delivery roller are driven by the DC motor. As the fuser motor rotates (Counterclockwise turn), the heat roller is turned. This roller fixes a toner image by heat and pressure.

2. At the same time, the delivery roller rotates to output the paper.

Eject Roller

(Drive)

Fuser Unit

Heat Roller

(Drive)

Fuser Motor

(CCW)

Figure 2-8

(6) Cover-opening motion of color drift sensor and density sensor

1. As illustrated in Figure 2-9, when the fuser motor rotates (Clockwise turn), the coveropening gear rotates, causing the color drift sensor and density sensor cover to open.

2. As the fuser motor rotates in reverse (Counterclockwise turn), the engagement of the coveropening gear is freed, and the color drift sensor and density sensor cover now closes.

Eject Roller

(Stop)

Heat Roller

(Stop)

Fuser Motor

(CW)

Cover Open Gear

2-10

Figure 2-9

Outline of color drift correction

The color drift correction is implemented reading the correction pattern that is printed on the belt with the sensor located inside the sensor shutter under the belt unit. This sensor is used to detect and correct the pattern.

Automatic start timing of color drift correction:

• At power-on

• When the cover is closed after it is opened briefly

• When 400 pages or more have been printed since previous execution A correction error may be issued due to an inadequate toner amount of the pattern generated, a sensor stained with toner, deficient opening/closing of the shutter, or for other reasons. However, even if an error is issued, it is not indicated on the operator panel. Therefore, forcible color drift correction will have to be performed in the self-diagnostic mode (page 4-21) to check the error indication.

CHAPTER 2 EXPLANATION OF OPERATION

Transport belt

Belt motor

Color drift sensor

Sensor shutter

Color drift sensor

Right color drift correction pattern

Left color drift correction pattern

Belt waste toner box

Belt cleaning blade

Color drift sensor

2-11

CHAPTER 2 EXPLANATION OF OPERATION

Error checking methods and remedial methods The color drift correction test function among the other self-diagnostic functions is employed to

check errors. (page 4-21)

Remedial methods against different errors

• CALIBRATION (L or R), DYNAMICRANGE (L or R) Check 1: If the above indication appears, check the connected state of the sensor cable

(FFC). If the connected state is found abnormal, restore it to the normal state.

Check 2: Check to see whether the sensor surface is stained with toner, paper dust or any

other foreign matter. If it is found stained, wipe it clean.

Check 3: Check to see whether the sensor shutter opens and closes normally, by the

MOTOR & CLUTCH TEST of the self-diagnostic function. If the shutter operates imperfectly, replace the shutter unit.

• BELT REFLX ERR Check 4: If this indication appears, check the cleaned state of the toner remaining on the

belt surface, in addition to making the above checks 1, 2 and 3. Take out the belt

unit, turn the drive gear located on the left rear side, and ensure that the belt

surface has been cleaned thoroughly.

If cleaning is not achieved perfectly and there still remains toner on the belt

surface after the drive gear has been turned, replace the belt unit.

• (Y or M or C) LEFT, (Y or M or C) RIGHT, (Y or M or C) HORIZONTAL Check 5: If the above indication appears, check to see whether the toner is running short,

based on an NG-issuing color.

Replace the toner cartridge, as needed.

2-12

Outline of density correction method

The density correction is implemented reading the correction pattern that is printed on the belt with the sensor located inside the sensor shutter under the belt unit. Automatic start timing of density correction:

• If the environment at power-on is greatly different from the one in which previous print was executed.

• If at least one or more of the four ID count values are close to those of a new product at power-on.

• When the ID count value exceeds 500 counts since previous execution.

A correction error may be issued due to an inadequate toner amount of the pattern generated, a sensor stained with toner, deficient opening/closing of the shutter, or for other reasons. However, even if an error is issued, it is not indicated on the operator panel. Therefore, forcible density correction will have to be performed in the self-diagnostic mode (page 4-22) to check the error indication.

CHAPTER 2 EXPLANATION OF OPERATION

Transport belt

Belt motor

Density sensor

Sensor shutter

Density sensor

Density correction pattern

Belt waste toner box

Belt cleaning blade

2-13

CHAPTER 2 EXPLANATION OF OPERATION

Error checking methods and remedial methods The density correction test function among the other self-diagnostic functions is employed to check

errors. (page 4-22) Remedial methods against different errors

• CALIBRATION ERR, DENS SENSOR ERR Check 1: If the above indication appears, check the connected state of the sensor cable.

If the connected state is found abnormal, restore it to the normal state.

Check 2: Check to see whether the sensor surface is stained with toner, paper dust or any

other foreign matter.

If it is found stained, wipe it clean.

• DENS SHUTTER ERR Check 3: Check to see whether the sensor shutter opens and closes normally, by the

MOTOR & CLUTCH TEST of the self-diagnostic function. If the shutter operates

imperfectly, replace the shutter unit.

• DENS ID ERR Check 4: Take out the ID unit and examine it to see if the drum surface has any abnormal

toner smudge.

Replace the LED head (Blurred focus), or replace the ID unit. To test-operate a new ID unit, use the Fuse Keep Mode of the maintenance

menu.

2-14

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