Next 400 DPI Service Manual

•

I

I

•

SERVICE

MANUAL

.

MAR.

1988

•

•

•

PREFACE

This Service Manual contains basic

info

rmation required

for

after-sales service

of

the

LBP-UX laser

beam

pnnter

. This

information

is

vital

to

the

serviceman

1n

ma1ntaming

the

h1gh

printmg

quality

and per-

fo

rmance

of

the

pnnte

r.

This manual

is

made

based on

the

OEM standard

manual.

Th1s

manual

consists

of

the

following

chapters :

Chapter

1 :

General

DesGr

ipton

Features. specifications. and

operation

Chapter

2: Operation and

Timing

A

description

of

the

principles

of

operation

of

the

electrical and mechanical systems.

the1r

functions. and

timing

of

operations

Chapter 3:

The

Mechan1cal

System

Explanation

of

mechanical operation. disassembly. reassembly. and

adjustment

procedures

Chapter 4 :

Installation
ReqUirements

for

a suitable

location

and

insta

llat

ion

procedures. plus

storage and handling

of

EP-S

cartridges

Chapter

5: Maintenance and Servicing

Parts

replacement

schedule. tools. lubricants. and solvents

Chapter

6:

Troubleshooting
Reference

values and adjustments;

troubleshooting

procedures

Appendix

:

Gen

eral

timing

chart. general

circuit

diagram.

PC

B ci

rcuit

diagrams. etc .

•

•

•

CONTENTS

CHAPTER 1 GENERAL DESCRIPTION

I.

FEATU

.RES

......................

1-1

IV.

PARTS

OF THE PRINTER

..........

1-5

II.

SPECIFICATIONS

.............

.

..

1-2

V.

OPERATION

..................

..

. 1-7

Ill.

SAFETY

INFORMATION

..........

1-4

CHAPTER 2 OPERATION

AND

TIMING

I.

BASIC

OPERATION

...............

2-1

Ill

.

IMAGE

FORMATION

SYSTEM

2-14

A.

Functions

. .

.................

2-1

A.

Introduction

. . . . . . . . . . . . . . . .

2-14

B.

Outline

of

the

Electrical

B.

Printing

Process

. . . . . . . . . . . . 2-1 9

System

...................

. . 2-2

C.

Operation ..........

.

.......

2-21

C.

DC

Controller

Input

D.

High-Voltage

Power

Signals

. ....

.................

2-3

Supply

.................

.... 2-23

D. DC

Controller

Output

IV. PICK-UP

/FEED

SYSTEM

........

.

2-23

Signals

......................

2-4

A.

Outline

.................

.

.. 2-23

E.

Basic

Sequence

of

B.

Cassette/Manual

Feed

.....

. 2-

24

Operations

..............

.

...

2-6

C.

Fixing

Roller

Heater

II.

LASER/SCANNER

.............

.

..

2-8

Controller

.....

.............

2-25

A.

Laser

System

.............

.

..

2-8

D.

Paper

Jam

Detection

........

2-27

B.

Scanner

Drive

...........

.

..

2-12

V.

POWER

SUPPLIES

..............

2-28

A.

Outline

....................

2-

28

B.

Protective

System

. .

........

2-

28

CHAPTER 3 THE

MECHANICAL

SYSTEM

I.

II.

Ill.

IV

.

V.

EXTERNALS

.....................

3-1

A.

Covers

and

Panels

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

B. Fan

..........

.

..............

3-3

C.

Ozone

Filter

.................

3-3

D. AC

Controller

Unit

...........

3·4

DRIVE

SYSTEM

..................

3-6

A.

Main

Motor

Unit

.............

3-6

PAPER

TRANSPORT

SYSTEM ...

..

3-7

A.

Pick-Up

Roller

Unit

...........

3-7

B.

Feed

Guide

Unit

. . . . . . . . . . . . 3-1 0

EXPOSURE

SYSTEM

.........

...

3-11

A.

Laser

and

Scanner

Unit

......

3-11

ELECTROSTATIC

IMAGE

/
DEVELOPING/CLEANING
SYSTEM

.......................

3-14

A.

EP

-S

Cartridge

.............

.

3-14

B.

Transfer

Corona

Unit

........

3-15

VI.

FIXING

SYSTEM

...

. . ...........

3-17

A.

Fixing

Unit

.................

3-17

VII.

ELECTRICAL

COMPONENTS

.....

3-

20

A. DC

Controller

PCB

..........

3-20

B.

Driver

and

Sensor

PCB and

Low-Voltage

Power

Supply

(Sensor/Power

Supply

Unit)

. 3-

20

C.

High-Voltage

Power

Supply

. . 3-21

D.

Signal

Ground

PCB (HVT)

.... 3-2

2

E.

Cassette Size

Sensing

Switch

PCB

................

3-

22

CHAPTER 4 INSTALLATION

I.

CHOOSING A LOCATION

....

...

..

4-1

II.

UNPACKING

AND

INSTALLATION . 4-2

Ill.

STORAGE

AND

HANDLING

OF

EP

-S

CARTRIDGES

..........

.... .

4-5

A.

Storage

of

Sealed

EP-S

Cartridges

..............

4-5

B.

Storage

of

Unsealed

EP-S

Cartridges

..............

4-5

C.

Handling

Suggestions

........

4·5

CHAPTER

5

MAINTENANCE

AND

SERVICING

I.

PARTS

REPLACEMENT

SCHEDULE

5-1

IV

.

LIST

OF

LUBRICANTS

,

II.

CONSUMABLES

.....

...

.....

...

. 5-1

CLEANERS

........

.

..

.

..

. .

......

5-4

Ill.

LISTS OF

TOOLS

.................

5-2 V. SERVICE

CHECKPOINTS

...

.

..

.

...

5-5

•

VI.

MAINTENANCE

BY

CUSTOMER

...

5-7

A. St

andard

Tools

........

.

.....

5-2

B.

Spec

ial

Tools

................

5-3

CHAPTER

6

TROUBLESHOOTING

I.

INTRODUCTION

.....

............

6-1

V.

TROUBLESHOOTING

A.

Initial

Ch e

ck

.......

...

. .

.....

6-1

MALFUNCTIONS

.......

.

.......

6-

22

B.

Basic

Proc

e

dure

.............

6-1

VI.

PAPER

TRANSPORT

II.

EXPLANAT

I

ON

FOR

TROUBLESHOOTING

...........

. 6-

28

SPECIAL

TOOLS

.

................

6-2

A.

Print

Paper

Jams

......

.

....

6-

28

A.

Printer

Dr

i

ver

/

Laser

B.

Incomplete

Paper Feed

......

6-

30

Driver

Tester

.....

.

..........

6-2

VII

.

LOCATION

OF ELECTRICAL

B.

La

s

er

Po

w

er

Te

ster

......

.

..

. 6-4

PARTS/

FUNCT

I

ON

..............

6-31

Ill.

MEASUREMENT

AND

A.

Switches

,

Photointerrupters

.

ADJUSTMENT

..

.

...

.

.....

. .

.....

6-5

and

Solenoids

............

. . 6-

31

A.

Image

Adjustment

..

....

. . . . . 6-5

B.

Motor

and

Others

...........

6-

32

B.

Mechani

cal

Adjustments

.....

6-5

C.

PC

Boards

..................

6-

33

C. Elec

trical

Adjustments

. .

.....

6-6

D.

Connector

s

................

6-

34

IV

.

IMAGE

DEFECTS

...............

6-10

V

III.

VARIABLE

RESISTORS. LEOS.

A. E

xa

mple

s

of

Image

Defects

. .

6-10

TEST

PINS

.

JUMPERS

,

AND

B.

How

to

Use

t

he

SWITCHES

ON

PC

BOARDS

......

6-

35

Tro

uble

sho

ot

i

ng

Table

s

.....

6-11

A. DC

Co

ntro

ll

er

PCB

.........•

6-

35

C.

Troubleshoot

i

ng

Image

B.

HVT

PCB

.......

.

...........

6-36

Defe

ct s . . . . . . . . . . . . . . . . . . . .

6-1

2

C.

Dr

i

ver

and

Sensor

PCB

......

6-

37

•

APPENDIX

I.

GENERAL

TIMING

CHART

.......

A-1

V.

SAFETY

CIRCU IT

...............

A-1 1

II.

LIST

OF

SIGNALS

/

COMMANDS

..

A-3

VI.

HIGH

-

VOLTAGE

POWER

A. DC

Controller

.....

. . .

......

A-3

SUPPLY

..................

.

....

A-1 2

Ill.

GENERAL

CIRCUIT

DIAGRAM

....

A-5

VII

.

INTERFACE

CIRCUIT

.

...........

A-

13

IV

. DC

CONTROLLER

.............

..

A-6

•

•

CHAPTER 1

GENERAL DESCRIPTION

•

• I.

FEATURES

.

.'

....................

1-1

IV

. PARTS OF

THE

PRINTER

..........

1-5

II. SPECIFICATIONS

................

1-2

V. OPERATION

.....................

1-7

Ill

. SAFETY

INFORMATION

.......

.

..

1-4

•

•

•

I.

FEATURES

1.

2.

3.

4.

5.

6.

7.

8.

This

high-speed.

non-impact

(low-noise)

printer

is based

on

electrophotographic.

electronic.

and

laser

technology.

The pri

nter

produces

high-quality pri

nts

on

plain paper. and can

produce

a large

variety

of

charac-

ters and

graphics

.

The

pnnter

is

compact

and easy

to

carry.

This

makes

it

easy

to

move

the

printer

to

where

it

1s

needed

.

A

corona

unit.

developing

cylinder.

photosensitive

drum

. and

drum

cleaning

unit

are

combined

int

o

a

single

assembly

called an " EP-S

cartridge

" .

The

cartridge

can be replaced

by

the

customer

when

necessary

. High

printing

quality

is

maintained

by a simple

cleaning

procedure

.

The

printer

can be

opened

and

closed

with a simple

one-hand

action, so

any

paper jams

can be

cleared

easily.

Laser

beam

safety

is

designed into

the printer.

The

printer

is

approved

by

the

U.S.

Center

for

De-

vices

and

Radiological

Health (CD

RH)

.

The

power

supply

of

the

printer

will

operate

on

all

the

following

voltages

: 1

OOV/ 115V/220V/240V

(50/60Hz

).

The

scanning

pitch

(300

or

400

DPI) is selected and

the

printer

switched

ON/OFF

by

the

external

device

that

is

controlling

it.

1-1

•

•

•

II.

SPECIFICATIONS

1 Type

2.

Printing

method

3.

Printing speed

Cassette feed

4.

Time

for

first

print

5.

Warm-up

(WAIT)

time

6.

Opt

ical system
Laser
Scannmg

system

Scannmg p1tch

Honzontal
Vert1cal

7. Printing

system

Photosensitive

drum
Chargmg
Exposure

method
Development
Paper feed
Image

transfer
Separation
Fixing

method

Toner

supp

ly

8. Paper
Cassette feed
Manual feed

9 Cassette

1

0. Print delivery

1-2

Desk-top

page printer
Electrophotography
(

single-component

dry

toner)

8.1

prints

/min

(

A4

/Letter size)

~ge

l

I

I

1

OOV

/

115V

220V

i

240V

n

300

DPI

I

30s

or

less

25s

or

less

400

DPI

I

32s

or

less

I

27s

or

le

ss

Table

1-1

Note

: This table delineates

the

allowable time

from

when

a

Sig-

nal is received

by

the

printer

while

in

READY

state

at

an

ambient

temperature

of

20

°C until

an

A4

or

Letter sized

sheet is printed and delivered .

2

min

or

less {af

ter

power

on until

the

printer

warms

up at

an

ambient

temperature

of

20°C)

Semiconductor

las

er

Rotating

s1x-faced

prism

m1rror

300

or

400

dots

/in

300

or

400

rasters lines/in

OPC

Corona
Laser scanning system
Toner projection

development

system
Cassette {single cassettes ; manual feed)
Corona-assisted
Tangential ; (small

drum

radius /paper stiffness)

Heated roller

1

OOV

About

286W

115V

About

354W

220V

Abo

ut

962W

240V

About

1 1 OOW

Included

in replaceable EP-S

cart

ridge

Plain paper

of

A4

, Letter size

{60g

/m

2

-

80g

/m

2

paper)

Plain paper

from

1

OOmm

x

1

75mm

to

216mm

x

356mm

(

60g

t

m2 -

1

28g

im2 paper)

A4

/Letter selection (De

pth

:

16mm-

about

150

sheets

of

80g

1m

2

paper)
Face-up

•

•

•

11.

Print

tray

capacity

Plam

paper

:

1 2.

Env1ronment

Temperature
Hum1dity
Atmospheric

13

.

No1se level

14

D1mens1ons

(W

X

D

x

Hl

15

.

We1ght

16

.

Power

consump

t

ion

1 7. Line

voltage

requirements

About

50

sheets (8

0g

tm 2)

(

Number

of

sheets

depends

on

operatmg

env~ronment

.l

1

ooc

to

32

.5°C

(50°

F

- 91 °Fl

20

%

to

80

%

RH

570mmHg

to

760mmHg

(0m-2500m)

Under

50dB

(Al

(PAINT ING)

Under

45d8

(A) (

STANDBY

)

(1

m

away

from

the

pnnter

)

363mm

X

423mm

x

180mm

About

14kg

Max

.

540W

(1

OOV

.

pnntlng)

Max

.

640W

(1 1 SV.

pnntmg)

Max

. 1

240W

(

220V

.

pnntmg)

Max

.

1390W

(

240V

.

print1ng)

1 1

011

1 SV

(50

/

60Hz)

or

220/240V

(50

/

60Hz)

:

selectable

with

a

switch

(Volt

age

tolerance

:

±

1

0%)

Spec

i

fications

are

subject

to

change

with

pr

oduct

imp

r

ovement

.

1-3

•

•

•

Ill. SAFETY INFORMATION

A.

CORH

Regulat

io

ns

The

Cente

r

fo

r De

vices

and

Radiological

Health

(CD

RH

)

of

the

U.S.

Food

and

Drug

Ad

-

mtntstration

1mplemented

regulations

fo

r

laser

products

on

August

2.

1

976

.

These

regulations

apply

to

l

aser

products

manufactured

from

Allgust

1.

1976.

Comp-

liance

IS

mandato

ry

fo

r

pr

oducts

ma

rketed

in

the Un1ted

States

.

The

1nformat1on

shown

belo

w

in

dicates

compliance

w1th

the

CDRH

regulation

s and

must

be

attached

to

l

aser

products

marketed

in

the

United

States

.

Note

:

This

pr

oduct

confo

rm

s

with

CD

RH

'

Rad

iation

Performance

Standard.

21

CFR

Cha

pter

1

Subchapter

J.

Manu

fac

tur

ed:

'-

------

--'

Figure

1-1

The

information

shown

above

is

subj

e

ct

to

change

depend

ing

on

the

pnnter

model.

1-4

B.

Addi

t

ional

In

fo

rmation

When

servicmg

or

adjustmg

the

opt1cal

sys-

tem

of

the

pnnter

.

be

careful

not

to

place

sc

rewdri

ve

rs

or

othe

r

reflective

objects

in

the

pa

th

of

the

las

er

beam

.

Be su re

to

tak

e

off

accessories.

such

as

watches

and rings.

before

working

on

the

printer

.

A

reflected

beam,

though

invis1ble.

can

permanently

damage

you

r eyes.

Since

the

beam

IS

tnv1sible.

the

following

lab

el

is

attached

to

the

ms1des

of

covers

where

there

1s

danger

of

exposure

to

laser

radiation

.

DANGER-INVISIBLE

LASER

RADIATION

WHEN

OPEN

.

!.O

lD

DIRECT

EXPOSURE

TO

BEAM

.

I

VORSICH

-

'1SICHT8ARE

LASERSTRAHLUNG

.

.'

1EN

N

ABOECKUNG

GEOFFNET

UNO

SIC

HERHEITSVERRIEGEL

UNG

U

BERBRUCKT

NIGHT

OEM

STRAHL

AUSSETZEN

.

CAUTlON-I

NVISIBLE

LASER

RAOIAnON

WHEN

OPEN

.

AVOID

EXPOSURE

TO

BEAM.

I AnENTlON

-RAYONNEMENT

LASER

EN

CAS

D'

OUVERTURE

EXPOSITION

OANGEREUSE

AU

FAISCEAU

.

Figure

1-2

IV

.

PARTS

OF

THE

PRINTER

A.

Ex

te

rnal

Vi

ew

•

Fi

gure

1-3

•

Figure 1-4

•

(j)

Cassette

holder

®

Upper

unit

release

@

Upper

cover

@

Delivery

tray

®

Powe

r

cord

receptacle

®

Lower

cover

(j)

Interface

connector

®

EP-S

car

tridge

®

Voltage

selector

®

Print

density

adjustment

dial

1-5

•

•

•

B.

Cross

Sectio

nal

V

iew

1-6

I

f]l

CD

Laser/scanner

unit

\

\

I])

I

I

jJ

®

Preconditioning

exposure

l

amps

@

Pri

mary

corona

unit

@

Mi

rror

®

Upper

cove

r

®

Pick-up

roller

(j)

Lower

cover

®

Separati

on

pad

r r

~

'I>

I

I

ID

I

I

I

Figure 1-5

®

Registration

rollers

(j}

Transfer

corona

unit

©

Photosensit

i

ve

drum

@ Feed guide

@

Base

cover

@

Upper

fixing

roller

®

Lowe

r

fixing

roller

@

Delivery

tray

I

J)

•

•

•

V.

OPERATION

1.

Test

Print

button

The

test

print

button

is

l

ocated

behind

a

panel

on

the

front

side

of

the

base

cover

.

(See

Fi

gure

3-1

.)

Pressmg

1t

causes

the

printer

to

print

the

test

pattern

stored

in

the

memory

of

the

DC

controller

PCB.

After

the

printer

has

been

switched

ON

by

a

s

ignal

from

the external

device

and

the

ROY

sig-

nal

has been

made

TRUE

by

the

printer

. pressing

the

button

will

cause

the

printer

to

print

a

page

of

the

test

pattern

.

If

the

button

is

held

down

.

the

pr

i

nter

will

pnnt

the

test

pattern

continuously

.

2.

Print

density

ad

just

ment

dial

The

pr

i

nt

density

adjustment

dial

can

be

seen

when

the

pr

i

nter

IS

opened

(See Figure

1-

4) .

It

is used

to

adjust

the

print

density

.

Turning

the

dial

clockwise

lightens

the

print.

Normally

,

the

dial

should

be

set

to

the

" 5"

posit

i

on

.

ccw

(Da

rk

)

Figure

1-6

Dens1ty

1nd

ex

cw

(Li

ght)

1-7

•

•

CHAPTER2

OPERATION

AND

TIMING

1.

This

chapter descr

ib

es

the

prin

te

r f

unc

tions. the relations hips

bet

ween

mechan

i

sms

and circuits. and

timing

of

operations. Mechanical

linka

ge

s

are indicated

by

st

riped

condUits

(

• • • •

)

,

control

sig-

nals

by

ar

rows

(

).

and grou

ps

of

signals

by

thick ar

rows

(

c:::::::)

).

2. The

signals

in

dig1tal

circuits

are ident

ifie

d

as

"H"

for

H

IGH

an

d

"L"

for

LO

W.

The

voltage

for

LOW

is

very

close

to

OV

;

the

voltage

for

HIGH

dep

ends on

the

circuit.

If

a

signal

name has

no

bar

over

it

(e

.g

.•

POP).

"H

"

is

a "

TRUE"

signal.

If

a

signal

name has a bar over

it

(e

.g ..

Pi)l5),

"L"

is a

"T

RUE" signal.

(A

"

TRUE"

signal

will

usually

cause an

action

to

occur.

etc

.; a

"FALSE"

signal

will

normally

prevent

the

operation).

I.

BASIC

OPERATION

...............

2-1

A.

Functions

........

.

...

.

.....

. 2-1

B.

Outline

of

the

Electrical

System

.....

. . .

.....

. . .

.....

2-2

C. DC

Controller

Input

Signals

......................

2-3

D. DC

Co

ntroller

Output

Si

gnals

......................

2-4

E.

Basic

Sequence

of

Operat

i

ons

. . . . . . . . . . . . . . . . . . 2-6

II. LASER /

SCANNER

...

...

..........

2-8

A.

Laser

System

...............

. 2-8

B.

Sc

anner

Dri

ve

. . . . . . . . . . . . . . 2-

12

Ill.

IMAGE

FORMAT

I

ON

SYSTEM

...

2-

14

A.

Introduc

t

ion

..

.

.............

2-

14

B. Pri

nting

Process

............

2-

19

C.

Operation

.

...............

. . 2-21

D. High-

Voltage

Power

Supp

ly

.....

.

...............

2-

23

IV

.

PICK-

UP

/FEED

SYSTEM

.

........

2-

23

A.

Out li

ne

....................

2-

23

B.

Casset

te/

Manual

Feed

......

2-

24

C.

Fixing

Roller

Heater

Controller

......

.

...........

2-

25

D.

Paper

Jam

Detection

........

2-27

V.

POWER

SUPPLIES

.......

.

......

2-

28

A.

Outline

....

.

..

.

............

2-

28

B.

Protect

i

ve

System

.

.........

2-

28

•

•

•

I.

BASIC

OPERATION

A. Functions

Printer

functions

can be di

vid

ed i

nto

five

groups

:

the

interface

system

.

the

overall

control

system

.

the

laser/scanner unit.

the

1mage

fo

r

mation

system.

and the

pape

r

pick-up

tfeed

system

.

.

To

external devi

ce

(

host

computer

)

~

-----n

____

_

______

___

,

: I

ln

~erfaca

PCB

I

I

NTERFACE

SYSTEM

1

L-----

~---

--

---

- -

---

-

_j

r

____

y

____

_

_________

,

I

I I

OVERALL

CONTROL

!

.

OC

contr

oller

PCB .

SYSTEM

I

L

---~-----~--------~

__

SL

__

~

--

-

-------

--,

I

LASE

R/

SCANNER

UN

IT

I

I

MAGE

FORMATION

SYSTEM

1

1

1 I

I I

I

I

I

I

I

I

I

I

I

@]

!

.....---

......

I

L...;;.....;.;...........,~

I

I

I

L _

______

_j

___

_

I

_____

j

I

PAPER

PICK..UP/

FEEO

SYSTEM

L------

-------------

----

-

~

Figure 2 -1

Manual

feed

un•t

Cas

sette

2-1

•

•

•

B.

Outline

of

t

he

Elect

rical

System

Oper

ations

of

this

pnnter

are

controlled

by

two

microprocessors

on

the

DC

cont

ro

ll

er PCB.

When

the

printer

power

is

switch

ed

ON

by

a signal

from

the

external

device.

the

microprocessors

output

s1gnals

to

dnv

e

the

laser

diode.

scanner

motor.

mam

motor

,

and

othe

r

components

in response

to

commands

and

im

age

da

ta

received

from

the

external

device

via

the

interface

PCB .

2-2

I

I

I

-:;

<:

I

!

I

~

I

I

I

I

~

I

I

I

I

I

L

_-l

..

u

~

4icc

~~

~

I

I

I

I

!

I

l

I

l

'----

Optical

fiber

~

Laser

diode

Scanner

motor

DC

High·voltage

contro

ll

er

PCB

unit

Cassette

so

ze

sensing

switch

Driver/sensor

l

PCB

Ma

in

motor

Saftty

PCB

l

Low-voltage

AC

controll

er

pow.r

supply

PCB

1

Figure

2-2

.I

Primary

I

I

corona/grid

bias

J

Transfer

corona

J

r--

1

I

t-----'

I

Dev~

·t>

oong

bias

~

I

J

Static

cnarge

I

l

eliminator

Toner

sensor

J

J

Sensors/selenoids

I

I

L

J

Precondit

oonong

J

l

expo

sure

l

amps

•

I

Delivery

unit

paper

l

1

sensor/thermostor

J

Rollers/pt1oto-

I

I

sensotive

drum

~

Fixing

roller

heater

J

•

•

•

C.

DC

Co

ntroller

Input

Signals

Delivery

un1t

paper

sensor

Thermistor

Paper sensor

~l~erPCB

J85

1-2 J206-2

I

r-

-+)-------.:....::...:....::..

...:..-<1

POP (H

when

paper

Is

sensed)

·3

.J

~----~~--~--------~~

'--------

~

~-

·

..:..._

1

---~

·

.:._1

w

+5V

~---

~

~~---

·

.:

5:..._

_____

·.::5

_1

FSRTH

(Voltage

drops

as

f1x1ng

roller

~

r

4

4

temperature

roses

I

~

j+

Driver

and

sensor PCB

I

~~----~--~•>--J3_0_1_·7

________

J_21_3_·7

__

~

4

~~t+SV

PS301

.a

a

I

(:::::)J.r--

-~;>---.:...----

--·.:...4,.

PEMP

(H

when

cassette

has paper)

.s

I

tJ.

Manual

feed

un1t

paper

sensor

I

~

...-

---tl>---

·

.::

9

______

·

.::9--<~

MPFS

(H

when

there

IS

no

pacer

on

manual

feed

trav

l

~

I

Drum senSitiVtW
ident1ficat1on

switches

EP-S cartrodge

L

/

'\

TB701

.....

"'

I

i

1

Toner

sensor

·1 ·1

I

ffiNsi

l

SW30:

I

~-o--

o-----

-+).--

---·

2

___________

·

2

-~

CSENS2

SW301

(See

page

2-101

HVT

unit

----,

HVT
PCB

I

I

I

I

~~-

J7

_o_,_

·5

--~~~-

J

_

7

_o2_

·

_5

__________

4

~

J2114

I

I

I

I

TENS (Falls

below

a

threshold voltage when

toner

holder

IS

empty)

Scanntng

unit

= = O

=p=

ti

=c•:::,

'='=i

be='===fi

=======

J::2::0=1=,

~

80

L_

Figure

2-3

2-3

•

•

D.

DC

Controller

Output

Signals

Laser

diode

PCB

Laser

diode

I

L

Scanner motor

Reg1strat1on
roller cl u

ten

soleno

id

2-4

-2

.J

.J

-2

-1

LOAV

(H

to

swttch laser

ON)

PO (Voltage 1n propOrtiOn

to

tntensitv

of

laser

beaml

OSAOJ

r-----

~r_-

__

-

__

-_-

__

-_-

__

-

__

-

__

-

__

-~_J_

20

_

3

_.~

7

~+24VA

I

,.---r-----------'--.:.:

·

S~<i

SC

NCONT

(H

to

drtve s

canner

motor)

-----------~

r-

-

------

__

d--

1

;~

TG

I

:

1

I

..__---

----

--~

.

..

rn

-3

REGO

(H

to

operate

regiStration roller)

Figure

2-4

•

Precondi tion in

exposure

1

9

amps

•

•

Lamoboard

/

scanner

untt

h

----~

o~,ustng

Precondrttonrng

__

_

exposure

I

r - - -

!.m3

board

I

---.,

I

~

J801·2

i

!

\S)

-==·

~:!·:~

=--=-

---

'-

I

____

.J

Safety

PCB

Figure 2-5

r-=-

1

u~..

controller

PC

B (2/2)

PEXPO

(

L

to

swrtcn

lamps

ON)

preconditronrng e

xposure

FAN

L

2-5

•

•

•

E.

Basic

Sequence

of

Operations

Two

consecutive

prints

on

A4

paper

165

°C
POWER
ON

PANT

o'o,),l f

;

..,.,

.,.

'NMU P

,-~

.

,., .

..

1 . .

·•

j_,·o•J-i'O''

-

I

I

I

I

--

I

ROY

signal

Fixing

roller

heater

165"C

I I I

1ao•c

I I

I

Mai

n m

otor

IJi

.._About I

<ec

. j

I

1

I

I

Pri

mary

coron

a

II

~

Aoout

0 .5

tee

.

I

I

I

Transfer

corona

II

I

~About

1.3 sec.

I

I

II

I

I

I

Scanner

motor

Laser

diode

About

l

<ec

.l

About

7 4 sec. --1

P

ick-

up

roll

er

AOOUI 1 <OC

.

~

I

clu

tch

solenoid

Registration

roller

About

6 .2 sec ..j

1--

clutch

solenoid

VE

RTICAL

SYNC

..j

~

Aoou

1 0 .

02

sec

.-.IJ..

Abo~o~c

0.

02

sec.

signal

Figure

2-6

Per

iod

Purpose

WAIT

From POWER ON unttl

the

Fi

xin g roller

warm-up

(

WAIT

period)

fixing

ro

ller

tem

perature

reaches

165°C

.

(T

wo

mi

nutes

or less

man

1

a

mbient

tem

perature

of

1 2o•c1.

I

STBY

I From the end

of the

WAIT

Fixi

ng

roller held

at

1 65°C

T

(STANDBY) peri

od

until:

to keep

the

printer

ready

to

I

1 . a PRNT signal is

inputted

print

.

I

fro

m the external device.

or

I

2.

from

the end

of

the

LSTR3

period

until

a

PANT signal is i

nputted

from

the

external device.

or

I

3.

the

power

is

switched

OFF.

WMUP

After

the

PANT signal has

Fixing roller

warm-up

(

WARM

-UP period) been

inputted

from

the

external

dev

ice

until

the

fixing

roller reaches

175

•c .

( 1 0 sec.

or

less.)

INTR For

about

2 sec .

after the

Residual charges removed

(INITIAL main

motor

starts

rotating

from

the

drum

and

its

ROTATIONS

for printing .

photosensitivity

stabilized

per

iod)

in preparation

for

printing.

Table

2-1

2-6

· ; -

'

1ss•c

Remarks

Period

I

Purpose

I

Remarks

•

PAI

NT

I

For

about

1 7.9 sec.

from

The

VDO

sagnal

from

the

I

(Print)

paper

pi

ck-up

(about

20

.4

1

external device.

conveys

all

i

sec.

for

legal

size).

1

ima

ge

data.

the

i

mage

as

I

I

'

fo

rmed

on

the

photosensatave

drum

. and

.

I

.

the

amage as

transfe

rred

to

paper

.

I

LSTR1

' From

when

the

transfer

last

printed

page delivered.

Whenever

a PANT

sagnal as

(FI

NAL

co

ro

na

goes

OFF

untal

the

l

•n

putted

from

the

external

ROTAT

IONS

1

pnmary

corona

goes

OFF. devace.

the

INITIAL

period)

• ROT

A

TIONS

peraod beg

ans

I

!

ammedaately.

LSTA2

From

when

the

primary

Last pranted

page

delivered.

I

If a PANT sign

al

is

anputted

(FI

NAL

co

rona

goes

OFF

unt

il

the

from

the

external devace.

ROTATIONS 2

d

evelop

ing

baas

(DC) goes

the

developang

bi

as

(DC

I

penod

)

OFF

.

I

goes

OFF

.

then

the

INITIAL

I

ROTATIONS

penod

begans.

LSTR3

From

when

the

developing

Last

printed

page

del

ivered.

I tt

a PANT signal is

inputted

(FINAL

bias (DC) goes

OFF

until

the

t

from

the

external

dev

ac

e.

ROTATIONS 3

mam

motor

stops

.

1

the

INITIAL ROT

A

TIONS

period)

I

period

begans ammedaate ly

Table

2-2

•

•

2-7

•

•

•

II. LASER

/SCA

NNER

A.

laser

System

1.

Introduction

To

external

dev

ice

S-

r------------------

.

1 I

nterface

(PCB) 1

:

80

VDO VSYNC

I

.. _--

-------

---

_____

..J

Optic

al fiber

Mirror

Photose

nsi

tive

drum

Figure

2-7

In

response

to

the

VIDEO signal (VDO)

transmitted

from

the

external

device (via

an

in-

terface

PCB)

to

the

DC

controller

PCB,

the

laser

driver

on

the

DC

controller

PCB

sends a LASER

DRIVE

command

(LDRV)

to

the

laser unit. and

the

semiconductor

laser emi

ts

a laser

beam

.

LDRV can be anyone

of

three

voltages,

de-

pending on

the

sensitivity

of

the

drum. The

laser

output

is regulated using

the

analog feedback

signal PD.

which

is generated

by a photodiode

in

the

laser

unit

that

senses

the

intensity

of

the

laser beam.

The laser beam is aligned

by a collimator

lens and cylindrical lens

into

a parallel

beam

that

strikes

the

six-faced

(prism) scanner

mirror

that

is

rotating

at

constant

speed.

The

beam is

reflected

from

this mirror. then

brought

to a point

focus

on

the

photosensitive

drum

via a mirror.

Each face

of

the

scanning

mirror

in

turn

scans

the

beam across

the

drum

.

The

drum

also

rotates

at a constant

speed.

As

it

rotates.

the

laser beam successively scans

across

its

surface.

Thus

the

laser beam builds

up

an

image on

the

drum

surface

.

2-8

2.

Scanning

Exposure

The simplest

example

of

exposure of

the

photosensitive

drum

by

the

laser beam is to I

m-

agine

that

both

the

drum

and beam are

station-

ary.

In

this case

the

las

er

beam illuminates a sm-

gle

point

on

the

drum

.

....

'

'

Dire

cti

on

of

scan

',

,tlf,

-- --

--

'

'

'

'

'

'

S

cannin

g mirr

or

F

igure

2-8

The

scanning

mirror

shown

in Figure

2-8

is

turned

by

the

scanner

motor

and reflects

the

laser beam across the

photosensitive

drum

(scanning).

Ele c

tro

stat

iC

~

_ _ _

__

1

Photos

ensotov

e

l

at

ent oma

ge

- -

dru

m

L---------------

--~

1

Black •mage Wh•te •mage

\laser

ON) llaser OF F)

LOR\.

po

ono

.oc

Figure

2-9

Figure 2-9

shows a hypothetical

image

formed

by

one scan

of

the

laser beam across a

nonrotating

drum, the

beam being

modulated

(switched

ON/

OFF

for

various lengths

of

time)

by

the

LDRV signal.

In actuality,

the

drum

is

rotat

ing while

the

laser beam scans across it.

Figure

2-10

shows a more

accurate repre-

sentation

of

scanning .

•

•

•

t l

~

~.

\

Laser be

am

---

~

~~

v

f)

I

Scannong m o

rror

--Phot

O'iensotlve d

rum

o· -

, -,....,..,

.-

~r-.

f'Gj:rJ

-

'-

--

-

--

----

_..J

-~--

1

Figure

2-10

Successive scans are

therefore

separated

by

this

interval.

Each

time

the

laser

beam

returns

to

the

start

of

a scanning

line

(slightly

to

the

side

of

the

drum),

its

light

is ref

lected

via a small. fixed,

beam-detect

(BD)

mirror

to

an

optical

fiber

.

which carr

ies

the

light

signal

to

the

DC

con-

troller

PCB

to

indicate

that

the

beam is

about

to

scan

the

drum

again.

The

DC

controller then

generates a HORIZONTAL SYNC signal

(BD

l.

the

signal

to

start

modulating

the laser

beam

for

the

next

scan

across

the

drum

.

3.

Laser

Driver

1.

Outline
This

circuit

generates

the

laser

drive

current

(LDRV) and

switches

it

ON and OFF in response

to

the

signal

VDO

from

the

interface

PCB.

The

drum

rotates

at

constant

speed

while

the

laser beam scans

across it. In

the

time

that

the

beam

takes

to sweep

across

the

drum

and

return

to

its

original

position.

the

drum

surface

has

shifted

downward

by

about

85

,u.m

(300

raster lines ;inch)

or

about

64

,u.m

(400

raster

lines/inch).

The

laser

driver

circuit

includes

switches

SW301

and

SW302 that

send a

combination

of

signals (CSENS 1 and CSENS2)

to

mdicate

the

sensitivity

of

the

photosensitive

drum. The

dnv

-

er

circuit

adjusts

the

laser

drive

current

to

SUit

the

info

rmat

ion

of

these

signals.

matching

the

intensity

of

the

laser

beam

to

the

sensitivity

of

the

drum

.

DC

controller

r.==================·

:nl

\I·CPL

-L sc

S·CP

U

~

IQ~

_ C'

,.-

~

10-bit l 1

30

:" '

0

para-·

.----.

fConstant

ILaserdiode

unlt

:·1

\IL

O!'I llel Laser

current

Laser I

; :

~

1

•

1

~

..._=-

DI

:...._--I

I

·s

ignal drive ci

rcuit

drove

1,

.--

u . ,...

1

~

current

(laser

current

1

~·

L

OR

\ 1

Cassette size
sensing

sw

itches

r;;:

;,

p~

"

""

""'

!

~

II.

;~:

---<'~

P~IZE:

· ·

~

I ~ ....

:o

I l

;....J,

PSIZEJ -

(o

~-

1,

S

G:>-0

l

(oL

=~

~--~00:::._--l zl

lb

r---v

control-

drive

1-

switchlngr--"n

j

~

PCST

:o

t-.:L::.::0:.:.;:-1;__-16

~~~~~lel

l

er

lcurrentl

ci

rcuit

~.

ri

~

--

Ll

~

.

'0CRT

23

55

signai-,;,B'""

i_as_..., t

~J

j-.-:.S

D;;:;A::.:;T:..:..A ____

~Sl I

~

current

.._.:.;;:;;.:..:.:..:..... ___

~

18

r---v

control-

- ·

62 ler '

,__

_

__.

...-------1

36

.-------1

37

I PO

L

._·_s_v_-I

Js

H

t--------~

Amplifier[I--4

'>-

I.:....::...-

Driver/sensor PCB

.'--

~·--"--.

_L..-

_____

------

I

~;f~~~JI

I

CS

ENS2

i

SW3

02-~

~-----

Figure

2-11

2-9

•

•

•

2. Principle

of

Operat

ion

a.

Control

of

laser beam

intensity

Just

before

the

laser

diode

begins

emitting

the

laser

beam

in response

to

signal

VDO

for

the

first

line

of

a

new

page

,

the

laser

beam

i

ntensity

is

always

adjusted

by

the

following

procedure

.

1) A fixed

time

after

the

main

mi

cro-

processor

(

M-CPU

)

receives the

PRINT

co

mmand

(PRNT) f

rom

the

i

nterface

PCB.

the

AUTOMATIC

POWER CON-

TROL

START

(APCST)

command

goes

" L" .

2)

When

1t

receives the

APCST

signal ,

the

s

ub

-

micropro

cessor (S-CPU)

cuts

off

the

bias

current

and

drive

current

to

the

laser

diode.

then sets

the

LASER ON

(LON)

command

to

" L" .

3)

IC204

receives

the

LON

command

and

out~ts

a

" L"

MANDATORY

LASER

ON

(

ML

Nl

command.

causing

the

laser

c

urrent

switching

circuit

to

supply

laser

drive

current

to

the

laser

diode

.

4) The

sub-microprocessor

(S-CPU)

rapid-

ly steps

through

an

increasing

8-bit

parallel

output

at

pins

55-62

, causing

t

he

bias c

urrent

through

the laser

diode

to

sncrease

steadily (

start

i

ng

from

O).

5)

As

the bias c

urrent

increases.

the

laser

di

ode

beg1ns

emitt

i

ng

l

ight

(l

asing

).

A

photod

i

ode

(

PO)

senses

the

intensi

ty

of

the laser beam. The

voltage

(monstor

v

oltage

) generated by

the

photodiode

is

amp

lified and

sent

to

the

sub-m

i

cro-

processor

(S-CPUl

as a

feedback

signal.

6)

When

the

mon1tor

voltage

reaches a

preset

allowable

limit.

the

sub-micro-

processor

(S-CPU) st

ops

increasing

the

bias current.

7)

The

sub-microprocessor

(

S-CPUl

sets

the

output

at

pins

55-62

so

that

the

o

utput

from

the

bias

cur

rent

controlle

r is

80

%

of

the

drive

voltage

to

the

diode

reached

when

the

monitor

voltage

reached

its

allowable

limit

.

At

this

bias

current

the

laser

diode

emits

no

light.

(Bias

current

determination)

8)

If

the

monitor

voltage

exceeds

the

preset

value,

bias

cur

rent

is

adjusted

again .

9)

The

sub-mic

ropro

cessor

(S-CPU)

the

n

rapidly

ste

ps

through

an

increasing 1 O-

bit

parallel

output

at

pins 7-1

6,

causing

the

drive

curre

nt

through

the

laser

diode

to

increase steadily (starting

from

0).

1

Ol

As

the

dr

i

ve

current

increases.

the

laser

diode

beg

ins

emitting

light

and

photo-

d

iode

returns a

feedback

signal

to

the

S-

CPU.

11)

The

sub-microp

ro

cessor

(S

-CPUl i

n-

creases

the

drive

current

until

the

feed-

back

voltage

reaches a

target

value.

This

value depends

on

the

sensitivity

of

the

drum

.

2-10

Drum

Target value

s

ens1t

1v1

ty

l

Same

as

1

nput

vol

tage

at

p1n

35

of

S-CPU

M

90%of

1

nput

vo

l

tage

at

p1n

35

of

S-

CPU

H

80%

of

m

put

voltage

at

pm

35

of

S-

CPU

Table

2-3

Drum

Sens

itiv

ity

and

Target

Values

~

CSENS1 CSENS2

L

L L

M

L

H

H

H

L

Cartr

i

dge

(

drum

)

not

H

H

installed

Table

2-4

Meaning

of

Drum

Sensitivity

Identification

Signals

1 2) The

current

at

which

the

feedback

voltage

matches

the

t

arget

value is set

as

the

operatsng

the

laser di

ode

dn

ve

current.
(Drive

current

determsnationl

13)

If

the

feedback

voltage

exceeds 1

05

%

of

the

target

value.

the

laser

drive

current

is

adjusted again.

__

14)

The LASER

ON (LON)

command

goes

"H"

, caussng

the

MANDATORY

LASER

ON (MLON)

command

to

go

"H"

. This

causes

the

switching

circuit

to

cut

off

the

drive

current

to

the

laser

diode

.

Figure

2-12

shows

how

the

la~er

di

ode

bias and

drive

currents

are adjusted

by

the

above

procedure

.

•

•

•

La

ser cur

rent

1

Threshold

current

level

L

-·

Laser d

nve

current

I

.!

--

Laser

b•as

current

L-~

___

..__...._

'

:_~,__~----"--<~

.... t

(Timel

End

of laser

dnve

current

ad

JuStmen

t

E

nd

of laser b1as current

ad1ustment

Figure

2-12

b. Laser

emission

control

system

The

laser

diode

emits

light

in response

to

the

VIDEO (VDO) signal

for a period

suffi-

cient

to

scan

the

width

of

the

paper

being

used. Paper size

info

rmation

is in

putted

from

the

cassette

size sensing

switches

SW261

to

SW263

(signals

15SIZE1

to

PSIZE2) .

!

I

No. I Cassette size

I

Cassette holder sw1tch

SW261 1

SW262

SW263

I

,

I

A4

OFF

l

ON

ON

2

1

Letter

OFF

I

I

OFF

ON

3

Cassette

i

i

not installed

OFF

I

OFF

OFF

Table

2-5

Coding

of

Paper

Size

Information

1)

When

the

main

microprocessor (M-

CPU) receives a

"L"

l'"RlNT

command

(

PANT}

from

the

interface

PCB.

it

out-

puts

the

data

of

the

paper

information

signals

to

the

sub-microprocessor

(S-

CPU)

by

an

SDA

T A signal.

2)

The

paper

size

information

is used

by

the

main

microprocessor

(M-CPU)

to

output

to

IC204

a VIDEO ENABLE (V

El

command

to

erase

the

front

and rear

edges

of

the

image

.

3)

The

paper

size

information

is

used

by

the

sub-microprocessor

(S-CPU)

to

form

the

Dl signal.

This

goes

to

IC204.

which

generates

a HORIZONTAL

MASK

(HMSK) signal.

this

is used internally in

IC204.

(HMSK is

not

outputted

.)

4)

IC204

modifies

the

VIDEO s1gnal (VDO)

using

the

VE

and

HMSK

signals

to

form

signal

VO

which

it

outputs

to

the

laser

drive

current

switching

circuit.

5)

When

signal

VO

goes " L

".

the

switching

circuit

passes

current

to

the

laser d1ode.

to

cause

it

to

emit

laser

light.

Figure 2-1 3

shows

the

relationships

among

VE. HMSK. and

VO

.

II

\IS!(

Note:

TimeT

1 and

T2

vary

with

the

paper

size.

Time

T 1

depends

on

the

printing

density

(300

and

400

DPI).

Figure

2-13

2-11

•

•

•

d.

Scanner

Drive

1.

Introduction

Scann

mg

Scanner motor

I,

c

ontroller

'---...J

SCA

NNER

MOTOR

L-------l

DRIVE

c

ommand

Figure

2-14

The

key

part

of

the

scanner

unit

is

the

scan-

ning mir

ror. which

has

the

shape

of a hexagonal

pnsm with reflective

faces.

It

is

mounted

on

the

scanner

motor

shaft

and

turned

by

the

motor.

The

scanner

driver

keeps

the

speed

of

the

scanner

motor

constant.

A special lens

system

makes

the

speed

of

the

laser

beam

across

the

dr

um

constant.

The

scanner

driver

drives

the

scanner

motor

when

it

is receiving a SCANNER

MOTOR

DRIVE

c

ommand (SCNCONT) from

the

DC

controller

PCB.

2.

Scanner

Motor

Drive

System

Operation

The

scanner

motor (M3)

is a

flat-type

DC

motor

.

DC

controller

PCB

·8

v

400DPI

~s

v

4

TCHG

TheM-CP

U sets

the

scanner mot

or

speed

to

suit

the DPI SELECT signal (DPil

from

the

exter-

nal

device. When

signal DPI is H.

the

scanner

motor

speed is

set

for

400

DPI;

when

the

signal

is

"L". the

speed

is

set

for

300

DPI.

The

speed

is

changed

only

when

PANT is "

H"

. and is

changed

only

after a complete

page has been

printed

.

The

frequency

of

the

signal

from a crystal-

controlled

osc

ill

ator

(X201)

is

divided

down

by

IC204

to

produce

signal DCK,

which

produces

reference

fre

quency

signal CPIN

for

the

motor

driver

.

When

PANT (inputted

to

the

DC

controller)

and

PIS (i

nputted

to

the

motor driver) are

both

"L",

the

motor

driver

outputs

a FREQUENCY
CONTROL signal (AFC) and a PHASE CONTROL
signal (APC). AFC and

APC

are

summed

by

an

adder

amplifier

that

produces

the

voltage

(SCN-

CONT)

required

to

drive

the

scanner

motor

.

While

the

scanner

motor

is

rotat

ing .

it

gen-

erates a

tache-generator

signal

that

is

fed

back

to

the

motor driv

er

(IC207)

as FGIN.

The

signal

(frequency

and phase) is

compared

with

the

ref-

erence

frequency

by

the

phase

locked

loop

(

PLU

IC.

If

they

are

different.

the

speed

of

M3

is

changed

unt

il

they

are equal

by

changing

the

ef-

fective drive

voltage. Motor

speed is

kept

very

steady

.

Indicator

LED20

1 is ON

when

the

speed is

within

the

correct

range.

+24 v

L_.;::-------,

TG

TG

Scanner

moto

r

Figure

2-15

2-12

•

•

•

Resolut1on

SC

(IC204l

Oiv1der

(QPI)

diVISIOn

ratiO

div1sion

rat10

300

114

1/1

400

1.6

11

2

Table

2-6

The

relationship

am

ong

FGIN,

AFC.

and APC

are

given

below

.

1)

AFC

output

and

FGIN

frequency

Increases

motor

sp&ed

max

.

I-

--

- --..

Decreases

motor

speed

.,

m.n.

'""==TooSii);N=::r:::::=====~fOcliast=

-Too

sl

ow

Too

fast-

Target

speed

I

Li

near

""'

resPonse

(l

ock)

range

FGIN freQuency

!

motor

speed)

Figure 2-

16

2)

APC

output

and

phase

difference

H

Ph-

differen~

1~1

Figure 2-

17

The

following

OPI s1gnals

set

the

resolution

of

the

printer

.

300

OPI

400

OPI

DPI

(J205-A9)

L

H

DPIC (IC205-5

7)

H

L

Tab

le

2

-7

2-

13

•

•

•

Ill.

IMAGE

FORMATION

SYSTEM

A.

Introduction
The

image

formation

system is

the

main

part

of

the printer, where the image i

nformation

encoded in a

digital

signal (VDO)

from

the inter-

face PCB is

transformed

into

a visible i

mage

on

the

photosensitive

dru

.m and

subsequently

Las

er beam

Pri

mary

corona wire

Precond

otoonong-

e

xp

osure

lamp

transferred to print paper.

In

addition

to

the

photosensitive

drum, the

image

format

ion sys-

tem

includes the developing

unit

. cleaning unit.

and

other

parts .

Mirror

~I

''

I

I

!

/ .-

--

-

--

-

~

'

;

\1

-

co

..

o~

~

bl

adeong

'\

Blad e

Developong c

ylonde

r

F•• •ng

roller clean

er

-... Ph

oto

sensotove

__

_

1

=. .

0

dru

m _ _

--=-

/"'/

'

··

~

/

' _

~~ D ·~~

0 Pi

ck-up

roll

er

.--,

U

ppe

r fo.,

ng roll

er - -

__...

G

~~=

,

----:,

u

~

~

-----

. v

JW

R

egostrat

oon

rollers

\

··-

I

\_

-)

/

"-.J

_

.:.__

___________

_

St

att c charge Transfe r

corona

Lower f

ol(

ong

rOller

B.

Printing

Process

Fe

ede

r

e

lomonat

or

Figure

2-18

The cartridge used

by

the printer has a

seamless photosensitive

drum

with

the

struc-

ture

shown

in Figure 2-1 9.

The outer layer consists

of

an

organic

photoconductor

(OPC);

the

base is aluminum.

The

printing process can be divided

into

five

major

stages.

1)

Electrostatic latent image

formation

stage

t

S tep 1 Preconditioning exposure
Step

2 Primary corona

(-)

Step 3 Scanning exposure

2) Developing stage
'-Step

4

Development

3)

Transfer

stage

1--Step 5 Transfer

(+)

Lstep

6 Separation

4)

FEng

stage

Step 7 Fixing

5) Drum cleaning stage
'-Step

8 Drum cleaning

2-14

Figure

2-19

Phtoconduct

ove

l

ayer

Base

Elect

rostati

C latent omage f

orma

toon

sta

ge

-

------·--

- - - - - - ·

-------------

( \ P•tcOtiOt

t tOIM

'IO UOQtu

t l )

• - • - - - - -lO- - - • - - • - - - - - - - - . ---- - - -

Drum

cleanong 1

Development

sta

g~

__

_____ ~ __

__ • _ _

( 8. Dr

um

cleono

nq

) _ __ __ • . _ _ _

\ Tr

ansfer stage

'

·---

........ , .... .

..

; _____ -

-·

.

... ...

Fix

ong stage

',

-Paper

path

-Dorectoon

of drum

rotatoo

n

Figure

2-20

•

•

•

1 )

E

lec

t

rostatic

l

ate

nt

image

formation
stage
Th1s

stage

has

three

steps

wh1ch

together

produce

a

pattern

of

electrical

charges

on

the

photosens1t1ve

drum

.

At

the

end

of

the

stage.

negat1ve

charges

re-

main

in

the

unexposed

"

dark"

areas.

Charges

are

absent

from

the

"

light"

areas.

where

the

laser

beam

struck

(

exposed

)

the

drum

surface

.

Si

nce

th1s

1

mage

of

negat1ve

charges

on

the

drum

IS

mv

1s

1ble

to

the

eye.

1t

is

called

an

"

elec-

trostati

C l

atent

1mage"

· 100 .

'--

------

-+--------------

--

--

Surface
oore•'lllal

(V)

-S

OO

•

Pre·
cond

r·

sure

(S

rep I)

Pr.

marv

co

rona

IS

reo

21

I

I

I

r'\.

-------

'

,

Exposed

area

I

U

ne"posed

area

Sc

annrn

g

~KO

OSu

r

e

(Sr

eo

31

F

ig

u

re

2-2

1

Step

1

Precond

i

tioning

exposure

Phorosens111ve
d

rum

Figure

2-

22

Prior

to

the pr

imary

co

rona

step,

the

drum

is

preconditioned

by

exposure

to

the

pr

econdi-

tiOning

exposure

lamps.

This

step

mak

es

the

sensitivity

(resistivity)

of

the

drum

umform,

and prepares

it

to

receive a

unifo

rm

charge

1n

the

following

pr

imary

corona

step

.

thus

preventmg

unevenness

in

the

printed

rmage.

Ref

ere

n

ce:

The

drum

surfaoe

potential

before

the

pr

econdi-

tioning

exposure

is

about

+

1

OOV

because

of

the

res1dual

positive

charge

from

the

transfer

corona

.

The

preconditioning

exposure

does

not

change

the

drum

surface

potential.

because

the

photoconductive

layer

acts

as a rect1fier and

cannot

conduct

pos1t1ve

charges

from

the s

ur-

face

to

the

base.

Step

2

Primary

corona

0)-Gn

d

P

ho

rosen

sr

ro

ve

Figu

re

2-

23

The

pnmary

corona

applies

to

a

uniform

layer

of

negative

charges

over

the

drum

surface

.

The

gnd

ensures

that

the

charge

is

di

s-

tributed

evenly

over

the

drum

.

Step

3

Scannmg

exposure

Unexposed
area

Laser

beam

E"oosed
area

Fi

gure

2-

24

When

the

laser

beam

scans

the

drum

sur-

face.

it

causes (by

drum

processes)

the

charge

to

be

neutralized

in areas

struck

by

the

laser

bea

m.

Areas

on

the

drum

with

no

cha

r

ges

form

the

electrostatic

latent

image

.

2-

15

•

•

•

2)

Dev

elop

ment

stage

Development

places

particles

of

toner

onto

areas

of

the

drum

that

have

been

cleared

of

charges

by

the

laser

beam

.

This

makes

a

visible

1mage. wh1ch

is

subsequently

transferred

to

paper

to

make

the

print.

Th1s

printer

uses

the

toner

projection

development

method

with

a

single-compon

ent

toner

.

Step

4

Development

Not

e:

The

charges

on

the

light

area on

the

photosen-

Sitive

drum

are

shown

as pOSitive

in

this

figure

.

In

actuality

they

are

negat

iv

e.

but

they

are

more

positive

than

the

developing

cylinder

and

expla-

nation

IS

si

mplified

by

regarding

them

as

nega-

tive

.

'

C

vl•nder

- >

Deve

loptng

cy

h

nder

Maqnet

;

Figure

2-25

As

shown

in Figure

2-25,

the

developing

un

1t

cons1sts

of

a

developtng

cylin

der

and

blade

.

Th

e

developtng

cylinder

rotates

around

a fixed

mternal

magnet.

The s1ngl

e-component

tone

r

consists

of

magnetite

and a

restn

binder

and is held

to

the

cylinde

r

by

magnetic

attraction

.

The

toner

is an

Insulator. and

acqu~res

a

negative

charge

by

· frict1on

due

to

the

rotatmg

cylin

der

.

Magnet

2-16

Blade

Concentrated
magn

et

oc

fteld

Figure 2-

26

Magnet

A

concentrated

magnetic

field

develops

be-

tween

the

magnet

and

the

blade and

attract

s

parttcles

to

the

edge

of

the

blade.

They

are

held

almost

1mmob1le. ltke

a

cur-

tam.

Th1s

"

curtatn

"

sktms

the

toner

part1cles

on

the

cylinder

into

a

thtn, un1form

lay

er

.

The

areas

on

the

drum

that

were

exposed

to

the

laser

beam

have

a h1gher

potential

(are less

negative)

than

the

negatively

charged

toner

par-

ticles

on

the

developing

cylinder

.

When

these

areas

app

r

oach

the

cylinder.

the

potential

dif-

ference

projects

the

toner

particles

to

them

.

(See Figure

2-25)

.

Develootng

cv

:t

nder

surface

potenua

l

-v

r___L_,

Drum

surface

potent

tal

~

0

I

L__J

[l

l

ex~~seo

area

l

i

u-

-.

---

:

=-=-=-u:::::

..

.:Ol

~

- DC b•as

0

:-

---

-

----

--

--

-

-

--

-

- - ,

> '

- V

\

Drum

surf

ace

potenrtal

(une

xposed

dreal

Fi

gure

2-27

An

AC

bias is

applied

to

the

developing

cyl-

ind

er

to

help

project

the

toner

particles

to

the

dr

um

surface

and

imp

rove

the

contrast

of

the

printed

image.

T

he

AC

bias

is also

applied

to

the

blade

to

keep

the

blade and

cylinder

at

the

same

poten-

tial

to

prevent

irregular

movement

of

toner

be-

tween

them.

The

center

voltage

of

the

AC

b1as

(

1

600

Vp-p)

varies

w1th

the DC

b1as

voltage.

Turning

the

pnnt

density

adjustment

d1al

changes

the DC bias. and

thus

the

potent

ial

dif-

ference

between

the

cyli

nder

and

drum

. This

changes

the

density

of

the

pnnt

.

•

•

•

R

efe

ren

ce:

Toner

projection

development

Latent

1m

age

<J>

(tl

~

(tl

"0

Q)

<J>

0

a.

)(

LU

Actually, both

unexposed

and

exposed

areas

on

the

drum

surface

have a negative

poten-

tial.

but

to

simplify

the

explanation,

the

drum

potential

is

shown

as

positive

when

it

1s

high-

er

(less

negative)

than

the

developmg

cylinder

potential.

and

negative

when

1t

IS

lower

(

more

negative)

than

the

developing

cylinder

potent1aL

Develop-

j

ing

b1as

Negat1ve 1

I

b1as

I

i

l

I

I

I

Pos1t1ve
b1as

'

Negative

· bias

I

Pos1t1ve

1

I biaS

I

I

Toner

movement

and electric

potentials

Drum

surface

porer>ttal

Developrng Developrng

cvtrnoer

).

'.

"''"'

"

tfi'"

PP""""

o,m

'"'''"

}

;;:::·D

~:

~

F-Fls~

:::":::

AC

b•as

-~·

>

L_j

--C level

DC

b

-'

-v

Tr

me

(tl

-

Drum

•as-,!

Drum

surface poten

t•al

, Devel

optng

Develo

p.ng

cvltnder

)

cylinde

r

surf

ace

oorenual

- Magner

Drum

surface

• 0 - 0

~:

=ftft

PP""'"

'

_ To

ner

V

~

~

' DC bias

AC

bras..:~

o ·-- -

-- --

-- - ·

-level

./

>

DC

bras-~

-v

Drum

= Tr

me

(tl

-

Drum

surface

oorenr•al

Develop.ng

cylinder

)

':

;;;:··6

;;"jiii: oc

b•"

-c,

o level

AC

bras-'..;>>

:-

,

-\

-i.

-v

Drum

DC

btas-

.:;..

T1me

( rl -

Drum

surface

ootenttal

Drum

surface

potentoal

I

Oevelo

p tng

cylinder

D

1

d

eveloptng

cv

tn

er

)

=

M:n~~&'

~"'

_Toner

•

~0~

DCbtas

AC

btas-

g

~:

-

--· .

~

level

Drum

DC b•as- -

-v

-

\_

Drum

surface

11r Ti

me

(tl

-

potenttal

Table 2-8

i

Descnpt1on

The

electrostatic

attract1on

I

caused

by

the

difference

in

potential

between

the

drum

1

surface

and

cylinder

1s

sufficient

1

to

overcome

the

attractiOn

of

the

magnet.

so the

toner

1

particles are pro1ected

from

the

cylinder

to

the

drum.

I The

amount

of

toner

proJeCted

I

depends

on

the

DC

b1as

on

the

cylinder.

I

When

the

b1as

voltage

nses

slightly

above

the

drum

surface

I

potential.

the

resultmg

weak

electnc

field

combmes

w1th the

!

I

magnet1c field

to

attract

toner

from

the

drum

back

to the

cylinder

.

This

removes

any excess

toner

adhering

to

the

drum.

and

improves

the

contrast

of

the

1

finished

print

.

The dr

um

sur

face

potential

is

I

only

slightly

highe

r than

the

1

cylinder

potential.

so

the

j

magnetic

attraction

to

the

cylinder

is gr

eater

than

the

I

attraction

toward

the

drum

I

due

to

the

electric

field

.

Therefore.

little

toner

is

I

projected

toward

the

drum

.

The

cylinder

bias and

the

magnetic

force

now

combme

to

attract

the

toner

strongly

to

the

cylinder. removmg

excess

toner

from

unexposed

areas

of

the

drum

and

preventing

foggmg

.

2-17

•

•

•

31

Tr

ansfer st age

In

the

transfer

stage. the

toner

1mage

is

transferred

from

the

drum

surface

onto

the

paper

.

Step

5

Transfer

T

ran

sfer

corona

Fi

gure

2-

28

A

pos1t1ve

co

rona

discharge

applied

to

the

back

of

the

paper

attracts

the

negattvely

cha

rged

toner

parttcles

to

the

paper

.

Step

6

Separation

Stattc

charge

e

lt

mtnator

Figure

2-

29

The

st1ffness

of

the

paper

ca

uses

it

to

separate

from

the

drum

. Ho

we

ve

r.

thin

pa per

has

low

st1ffness.

and

may

wra

p

around

the

drum

.

To

prevent

th1s.

separation

is

assist

ed

by

a

negat1ve

voltage

from

a

stat1c

charge

elimina

-

to

r

that

weakens

the

attractive

force

betw

een

the

paper

and

the

drum

.

2-

18

4) F

ixi

ng

st age

The

tone

r

•mage

transferred

onto

the

paper

in

the

transfer

stage

IS

held

only

by

electrostat•c

attractiOn

and

slight

physical

adhesion. so even

a

light

touch

w1ll

smear

the

•mage.

In

the

fixmg

stage.

the

toner

1mage

•s

fixed

by

heatmg

the

paper

and

applying

pressure

Thts

fuses

the

toner

part1cles

onto

the

paper

to

make

a

permanent

1

mage

.

Step

7

Fix

ing

Fnung

roll

er

_..

,.....

...

cle

aner

g

/""

F oxo

ng

roller

heater

K

~

~~

Up

per

flxong

'

1

roller

/

1

~

Toner

~

Paper

Lower

f

oxmg

roller

Fi

gu

re

2-

30

The

surface

of

the

uppe

r

fixing

roller is

coated

w1th

non-sticking

PTFE

resm. and

the

fixing

r

oller

cleaner

applies

a

further

coating

of

silicone

oil.

The

resm

surface

and

oil

keep

the

paper

from

Sticking

to

the

roller

and

prevent

off-

setting

.

5)

Drum

cleaning stage

In

the

transfer

stage.

not

all

the

toner

•s

transferred

to

the

paper

.

Some

remams

on

the

photosens1t1ve

drum

.

This

residual

toner

IS

cleaned

off

in

the

drum

cleaning

stage

so

that

the

next

print

i

mage

w1ll

be clear and

distinct.

Ste

p

8

Drum

cleanmg

Cle

antng

bl

ade

Sweeper

stnp

Figure

2-31

To

ner

remaining on

th

e

dr

um

surf

ace is

re-

moved

by t

he

cleaning bl

ade

.

Th

e s

cr

ape

d-off

t

oner

is

collected

by

t

he

s

weeper

stri

p and

push

ed

awa

y from

th

e d

rum

by

t

he

sw

ee

ping

b

lade

.

•

•

•

C.

Operation

When

the

DC

controller

receives a PRINT

command

(PANT)

from

the

external

device.

the

DC

controller

activates

the

main

motor

to

rotate

the

photosensitive

drum

and

developing

cylin-

der, and

the

processes

just

described

take

place.

To

compensate

for

variation

of

sensitivity

of

drums

(due

to

normal

manufacturing

variations).

the

DC

controller

needs

fo

adjust the laser beam

intensity

. A

cartridge

has one.

two

or

no

cams

Laser beam

Primary

Preconditioning

corona

exposure l

amps""

Mi

rror

that

actuate

one.

both.

or

none

of

two

sw1tches

(SW301

and

SW302)

to

s1gnal the

drum

sen-

sitivity.

The

cartridge

also

has a

toner

senso r.

When

the

output

from

this

sensor

falls

below

a certa1n

level.

the

printer

sets

status

1 5

bit 6 to

1 and

m-

forms

the

external

device

that

the

pnnter

IS

almost

out

of

toner

and

that

the

cartridge

will

soon

need

to

be

changed

.

-

-

·~

~

- -

I

.

Drum

~ans.itt

vtty

.

SWJ0

1

w

>

a:

0

0..

:JE

/ t

denttftcatton

""'

:\

~

..

-..

~v-

~

;:.~.

,.m.

Df

L .. ,

c,

.. ,,,.....

~~

~

/

SW302

', blade

~

Photo·

..._

. ·'

\

~

~er~~ive

\·~--/

<(

.J

<.::J

Z-

zl~

Ojx

i=

tW

EP·S

cartndge------

·.

'----:

..

'1\.,

d~

_./ ..

~

Toner

sensor

~~

Developing

cylinder

_ ,

a..

o-

z"'

S~ati

.

c

charge-~

l

)-Transfer

corona

eltmtnator

1

ali

UE

~g

Q..<.,l

TRANSFER
CORONA

DRIVE

command

(HVTONl

HIGH-VOLTAGE

UNIT

CONTROLLER

RESET

signal

(HVRST)

PRIMARY

DC

CORONA

DRIVE

commend

(

R'\iTON)

controller

DEVELOPING

BIAS

t

PCBl

(

AC)

DRIVE

command (DBAC)

TONER

SENSOR

signal

(TSENSl

DEVELOPING

BIAS

(

DC)

DRIVE

command

(DBDCl

f

~----------------------------------------~

High­voltage
un

it

DRUM

SENSITIVITY

IDENTIFICATION

signal tC"SE'iiiS2l

DRUM

SENSITIVITY

IDENTIFICATION

signal (

CSENS

1)

Figure

2-32

2-19

'

•

•

•

Sequence

of

Operations

Maon

mo

t

or

Precondotoonong

exposur

e

lamp

s

Promary

coro

na

Transf

er

coron

a

Scanner

moto

r

Laser doode

POWER lSS

•c

--

ON

PANT

...,

~

About

0.5

IOC

~

~

l

tC

~

AOOut

1

J

JK

I I

~

J

ote.

-+-About

DC

bias

L

~oout

J

1

r""

1

ltC

.

0

6

••e

I

~

~a

.

"

r

1 4

stc

--j

I

I

Developong
boas

AC

bias

I I

<>.

!>O

ut

0

05

>ee

"1~

AtK>ur 0.

4

otc

.,

r

-11-

~~~

Figure

2-

33

Note

:

Timi

ng

chart

for

two

consecutive

prints

on

A

4

paper

.

2-20

I , .•.

• r

.a;

--

..

~'"

0

,

I

I

I

I

I

I

I

I

I

I

I

I

I

I

I

I

I

.,

~

At>our

0 .4

soc

.

•

•

•

D.

High-Voltage

Power

Supply

1.

Outline

The

high-voltage

power

supply

provtdes

high-volta

ge

DC

power

to

the prima

ry corona

and

transfer

corona

when

Instructed

by

the

matn

mtcroprocessor (M-CPUl on

the

DC con-

troll er PCB.

It

also supplies

the

developing

cyli

n-

der w

ith

DC and

AC

bias voltages.

In

addition.

it

also houses

the

amplif

ier

for

the TONER SENSOR signal comtng

from

the

to

ner

sensor tn t

he

cartridge. and feeds

it

back

to

the

main

microprocessor (M-CPUl

to

notify

1t

when

the

remaining

toner

supply

IS

inadequa te.

DC

controller

PCB

High -voltage

power

supply

M-~

;1

~

~11elop1ng

bias (DC) -

-----.

I i j

ustment

Circuit

51

~

58Dc

I

.

lOBAC

i

~1

:"'

~~------------

----~

4

I

~

+-2

4 v

4

5

HV10N

4

9f---'l

H

VTON

t

l

HVRST

~

Low-volta

ge

I

pow

er

supply

r·

-·:

28

........

---+---<

~

RES

ET I .

I t _ _

_j

8

To

ner

O'"m

?

~"~'

• Develop1n

'-

--,

'--

--l

cy l1

nder

Separation
statiC

charge

eliminat

or

Transfer
corona

010

_j

..____

__

_

No

te :

[29

repre

sentS

the

dev

elop

1ng

bias (DC)

generation c1rcuit.

Figure

2-34

2.

Principle

of

Operation

1)

Pri

mary

corona

voltage

When

the

PRIMARY CORONA ON

com-

mand (HV 1 ONl

from

the

main

micro-

processor

(M-CPU)

of

the

DC

controller

to

the

hybrid

IC

(Q 1 l

of

the

high-voltage

pow-

er

supply

is

"L". a train

of

pulses is

output-

ted

from

pin 1

of

Q 1

to

the

primary

wind-

in

gs

of

transformer (T3). (L

ED1

goes

ON

when

HV1 ON is

"L".)

The

secondary

wind-

in

gs

of

T3

output

voltage P for

the

primary

corona

discharge

. (LED2 is

ON

while

there

is

an

output

from

Q 1

-1.)

2)

Transfer

corona

voltage

When

the

TRANSFER

CORONA

ON

com-

mand (HVTON)

from

the

ma

in

micro-

processor

(M-CPU)

to

Q 1 -9

is

"L" (

pin

Q 1-

1 9

"H").

a train

of

pulses is

outputted

from

pins 1 and

23

of

Q 1

to

the

primary

of

trans-

formers

T3

and T2,

respectively

.

The

output

from

T2

is added

to

that

of

T3

to

produce

voltage T for

the

transfer corona

discharge.

3) Developing bias

voltage

When

the

PRIMARY CORONA ON

com-

mand (HV

1 ON)

goes

" L

".

AC volta

ge

from

T3

is also

outputted

to

the

DC

developing

bias generating

circuit

.

When

the

DC DEVELOPING BIAS DRIVE

(D

BDC)

command

from

the

main

micro-

processor

(M-CPU)

is

"L"

as required

during

the

printing

process.

the

DC

voltage

set

by

variable

resistor

(VR 1) is

outputted

from

the

DC

developing

bias generating

circuit

and

added

to

the

output

from

the

secondary

of

transformer

(T 1 ) .

When

the

AC

DEVELOPING BIAS DRIVE

(D

BAC)

command

from

the

M-CPU

is

"L"

. a

square

wave

is

outputted from

pin 3

of

Q 1

to

T1.

This

AC

developing

bias is added

to the

DC

developing

bias

to

form

the

developing

bias

(DB),

which

is applied

to

the

developing

cyl-

inder

.

2-21

•

•

•

AC

boas

F

ig

ure 2-

35

De

veloping Bias

4)

Toner

Senso

r sy

stem

The

toner

senso

r

1s

respons

ive

to

the

elec-

tnc

fie

ld

of

the

b1as

on

the

developing

cylin-

der

.

When

there

is

toner

between

the

cylin-

de

r and senso r. the

field

sensed

by

the

sen-

so

r

1s

st

rong

;

when

the

re is i

nsuff

ici

ent

toner.

the sensed

field

is

weak

.

The

voltage

(a

nalog)

of

s1gnal

TSENS is pr

oportional

to

the

s

trength

of

the

field

sensed

by

the

tone

r

sen

so

r.

and

i

nforms

the

main

m

ic

ro

-

processor

!M-CPU)

of

the

amount

of

toner

.

2-

22

•

•

•

IV. PICK -UP/ FEED

SYSTEM

A.

Outline

The

presence

and size

of

the

cassette

instal-

led

in

the

cassette

holder

are

sensed

by

the

three

switches

(S

W26

1.

SW262.

SW263)

mounted

on

the

cassette

holde

r.

The

presence

of

paper

1n

the

cassette

is sensed

by

photointer-

rupter

PS30

1.

and

the

presence

of

paper

on

the

manual

feed

tray

IS

sensed

by

photointerrupter

PS302

.

If

the

cassette

contai

ns paper.

or

a

sh

eet

is

placed

on

the

manual

feed

tray

.

the

pick-up

roller

clutch

soleno1d

(SL

301

)

go~s

ON,

causing

the

clutch

to

engage

and

the

p1ck-up

roller

to

start

rotating

,

thus

feeding

a

sheet

of

paper

into

the

printe

r.

DELIVERY

UNIT

PAPER

SENSOR

sognal

Feed

er

Delivery

unot

paoer

sensor

-g

a:"'

oE

1-E

oo

~u

w

Z>

~a:

~0

Main

motor

The

paper

is fed

by

the

registrat

ion

rollers

so

that

the

leading

edge

of

the

paper

is

aligned

with

the

leading edge

of

the

tone

r

im

age

on

the

photosensitive

d

rum

.

and

the

tone

r

im

age

1s

transfer

red

to

the

pape

r.

The

paper

is

then

sepa

r

ated

from

the

drum.

carried

by

the

feeder

to

the

fixing

unit.

and

delivered

by

the

delivery

un1t

onto

the

delivery

tray

. Delivery

of

the

pnnt

is

sensed

by

the

delivery

unit

pap

er

sensor

(

PS33

1).

If

the

prtnt

does

not

rea

ch

or

clear

the

delivery

unit

pape

r s

ensor

w

ithi

n

the

preset

time.

the

microprocessor

on

the

DC

controller

assumes

a

pape

r

jam

has

occurred

.

The

printer

not1fies

the

externa l

device

of

the

jam

by

send-

ing a

status

signal

to

the

device

.

DC

controller

Drover

and

sensor

PCB

Pick.YP

roll

er

PS301

:

Paoer

sensor

PSJ02

:

Manual

feed

unot

paper

sensor

Figure

2-

36

2-23

•

•

•

B.

Cassette/Manual

Feed

If

there

is a

cassette

with

paper

in

the

cas-

sette

holder.

and

the

upper

fixing

roller

has

reached

the

required

temperature.

the

printer

makes

the

ROY

signal

TRUE.

When

a " L"

PANT

signal is

inputted

from

the

external

device

to

the

DC

controller

PCB.

the

heater

is

switched

ON

agai~

until

the

roller

!emperature

reaches

1

75

C. then

theM-CPU

makes

signal

MON "L"

to

operate

the

main

motor

(M1 ).

About 2 sec-

onds

later. the

M-CPU

makes

the

CPUD signal

'\7

vVMUP

·~TP

Main

motor (M1)

Pa

per sensor (PS301 )

P

ic

k·UP

roll

er cl

utch

~oou'Hf--

so

lenoid (PL301

I

•

Regi

strat

ion

roller clutch

.l.0

0\.11

2 9 sec

I

solenOid (

SL302

)

"H"

and actuates

the pick-up

roller

clutch

solenoid

(SL30

1).

The

main

motor

(M

1)

turns

the

pick-up

roller

one. turn.

feeding a sheet

of

paper

to

the

regis-

tration

rollers.

The

registration

rollers are

not

turning

when

the

paper

reaches

them

. so

the

paper

arches

up.

aligning

itself

along

the

rollers .

Abc:>ut

2:9

seconds

after

the

PANT signal. t

he

reg1strat1on

roller

clutch

soleno

id

(SL302)

is

actuated

. and

the

reg1strat1on rollers

rotate

.

feeding

the

sheet

of

paper

toward

the

photo-

sensitive

drum

.

11~!N T

1

LSTR,

-r

...

s•

=~2

1

t.S

TRJ

;o

av

\

I

ADOI..ol Q 2

,~C

(

\

Del i

verv unit

paper

sensor

1-----

J.bour J

l\tc

.__,

(PS331 I

1

Notes:

1.

2.

2-24

Figure

2-37

This

timing

chart

is

for

the

pick-up

of

one

sheet

.

The

timing

of

operations

for

manual

feed

is

identical

to

that

for

cassette feed

except

tor

the

paper

senso r:

Cassette

feed

..........

Paper

sensor

(PS30

1)

Manual

feed

...........

Manual

feed

unit

paper

sensor

(PS302l

•

•

•

C.

F

ixin

g Ro

ller

Heat

er

Co

nt ro

ll

er

1.

Outline
The

controller

operates

the

fixing

roller

heater

(H

1)

so as

to

mamta1n

the

fixing

roller

at

a

constant

(target)

temperature

.

The

tar

get

tem-

perature

depen

ds

on

the

stage

in

printing

opera-

tion

. In

the

STAN

D BY (STBY).

the

temperature

is

held

at

165°C

.

Du

r

i~g

the

INITIAL

ROTA-

TIONS

ONT

R). P

RIN

TING ROT

A

TIONS (PRINT)

and

LAST

ROTA

T

IO

NS

(LSTR) periods. the

target

temperature

is

180

°C. ·

AC

controller

Circuot
bre

aker

----

Noo

se

loi

ter

To

low.voltage{

power

supply

---4tr-------

----J

_

_j

I

0152

L

Troac

2. Principle

of

Operation

Since

the

contacts

of

relay (

RL

101 )

of

the

AC

controller

are

normally

closed.

when

the

DC

controller

outputs

the

FIXING ROLLER HEA TEA

DR

IVE (FSRDl

command

.

the

solid-state

relay

(SSR 1

01)

operates causing

tnac

(Q

1

0

1)

to

con-

duct

and

supply

AC

line

voltage

to

the

fixmg

roller

heater

(H 1 ).

The

resitance

of

thermistor

(TH 1) in

dicates

the

surface

tempe

rature

of

the upper

fix

ing

roller

(

analog

voltage

signal)

to

the

DC

con-

troller

.

With

this

feedback.

the

DC

controlle

r

can

maintain

the

roller

at

the

tempe

rature required

at

the

current

stage

of

pnnting

operation

.

·:~

---

--

I

~a

fety

relay

:

Curr

e

nt

momtor

tr

a

nsformer

•

cor

cuot

.J

Relay

RL101

Figure

2-

38

2-

25

•

•

•

3.

Pr

otection

System

Safety

requ1res

that

the

fixing

roller

be

pre-

vented

from

overheating

.

The

following

functions

protect

against

this

problem

.

1 l

Pr

o

tect

iOn

against

short

-

ci

r

cui

ted

Q

101

The

c

urrent

flowing

th

rough

the

fixing

roller

heat

er

(H

1)

is

co

nstant

ly

monitored

via

the

cu rrent

mo

n1tor t

ransformer

.

In

the

event

of

excess1ve cu

rrent

flow

. ca

pac

ito

r

(C1

56

)

of

the

current

sensing

circuit

ch

arges

up

.

When

C

15

6

reaches

full

charge.

th

e

voltage

on

the

base

of

transistor

(Q

1

54

)

is

more

than

abou

t

3.

5V

.

This

is

h

1gh

enough

to

switch

Q

1

54

ON

and

actuate

th

e

safety

relay

cir-

cu

it. o

pen

ing

the

safety

relay (RL

1

01)

and

cutting

the

cur

re

nt

through

the

fixing

roller

heater

.

As

lo

ng

as

the

heater

controller

is

ope

rat

ing

normally

.

signal

FSRD

holds

tran-

sisto

r

Q

152

ON.

which

holds

the

voltage

on

ca

pacitor

(C 1

56)

low.

so

Q

1

54

stays

OFF

because

the

voltage

on

i

ts

base

does

not

nse

over

about

3.

5V

.

2)

Protect

ion

against

overheating

Th

ermo

sw

itc

h (TP

1)

s

witches

OFF

at

a

tem-

per

atu

re

of

21

0°C

+

1

0°C

.

If

the

fixing

rolle

r

tempe

rature rises

above

this

point.

TP 1

cuts

off

the

cu

rrent

to

the

fixing

roller

he

ater

.

3)

Overcurrent

protection

This

is a

c1

rcu

1t

breaker

(C

B

101

)

in

the

pow-

er

line

supplyin

g

the

fixin

g

roller

heater

(H

1).

If

the

cu

rrent

becomes

excessive

. CB

1

01

tnps.

cutting

off

power

to

the

fixing

roll

er

heate

r

2-26

4. M

onito

r

ing

fixing

ro

ller

heater

temperature

If

any

of

the

following

conditions

occurs.

the

pr

int

er

i

dentif

ies

the

state

as

error

and sets

sta

tus

2

bit

2

to

1.

which

stops

the

printer

.

1)

If

the

fixi

ng

roller

temperature

does

not

rise

to

5°C

withi

n 1 8

seconds

after

the

heat

er

goes

ON

.

2)

If

the

fi

xing

roller

temperature

does

not

nse

to

165

°C

w1thin

180

seconds

a

fte

r

the

h

eater

goes

ON.

3)

If

the

fixing

roller

t

emperature

rises

above

230

°C

4)

If

the

fixing

roller

temperature

drops

below

1

40

°C

after

th

e

roller

has

heated

up

.

Note

:

As

a

safety

measure

(to

prevent

overheat-

ing

of

the

fix

i

ng

rollers).

the

ro

ll

er

heat

er

will

not

ope

rate.

even

if

the

pr

in

ter

is

switched

OFF.

then

ON.

in

quick

succes-

s

ion

.

If

it is

desired

to

cause

the

heater

to

operate

for

servicing

purposes.

switch

the

printer

OFF

for

at

least

1 0

minutes.

then

ON

.

•

•

•

D.

Paper

Jam

Detection

The

delivery

unit

paper

sensor

(PS331)

de-

tects

whether

paper

is feedin g

normally. The

microprocesso

r (M -CPU)

determines

wheth~r

paper

is

jammed

by

checking

whether

paper

1s

present

or

absent

at

the

sensor

at

times

stored

in

memory

. .

1)

Paper

does

not

reach _the

delivery

~n1t

paper

sensor

by

the

required time

. (Delive

ry

un1t

delay

jam)

2)

Paper

does

not

clear

the

delivery

~nit

pap~r

sensor by

the

required

time

. (

Delivery

un1t

stationa

ry jam)

1)

Delivery

unit

delay

jam

Main moto

r I

M1)

VERTICAL

SINC

s•gnat

I

VSYNC)

Jam

check

Oellverv

unit

paper sensor

IPS331 l

WMUP

IN

TR

3)

There

is a

sheet

of

paper

at

the

delivery

unit

paper

sensor

when

the

power

is sw1tched

ON

. (

The

paper

is

automatically

fed

out

1f

the

fixing

unit

temperature

is

greater

than

the

specified

temperature.)

4)

There

is

still a sheet

of

paper

at

the

delivery

unit

paper

sensor

after

the

paper

should

have

been cleared

by

automat

ic

paper

deli

v-

ery

.

5)

The

del i

very

cover

has

been

open

for

1 0

seconds

or

more

.

If

it

detects

a jam.

the

microprocessor (M-

CPU) i

mmediately

stops

the

main

motor

(M

1)

and

sends a JAM

status

signal

to

the

external

device

.

PRI

NT

Figure 2-39

2)

Delivery

unit

stationary

jam

Main motor

(M1 )

VERTICAL

SINC

signal

(V

SYNCl

Jam

chec

k

Delivery

umt

paper

sensor

(PS331 )

WMUP I

NTR

a.oouc

11

5 s

tc

1

A-'

or

'11!1U

~boutl27,ectL

11

Figure

2-40

PR

INT

AbOut

12.7

1~

.

t

LeqaiJ

Normal

Jam

2-27

•

•

•

V.

POWER

SUPPLIES

A.

Outline
When

the

low-voltage

power

supply is activated

by

a signal

from

the

external device.

it

produces

+ 5VDC. - 5VDC. and +

24VDC

supplies.

The

power

supply

also generates

the

reset signal (RESET)

to

reset

the

printer

at

the

following

times:

1)

When

the

power

is

switched

ON.

2}

When

the

power

supply is

momentarily

inte

rrupted

.

AC

controller

un•t

Int

erface

DC

controller

PCB PCB

,.,

!'l

To

external

i I I IPCONTl

Owooo 1

!TTlf~

L.J

LJ

B.

Protective

System

Low-voltage

power

supply

Switching
control
circuit

Figure

2-41

-~

~?

+24VB

~r

+24VC

._----~r

+2

4VA

i +24

vo

1-o---...:)

1)

+5V

I

~r

ORSW

t-----"~r

RESET

-------Jf

-5

v

If a

short

circuit

or

other

fault

causes excessive

current

flow

from

the

+ 5VDC. - 5VDC .

or

+

24VOC

power

supply.

the

overcurrent

protection

system

automatically

shuts

off

the

output

to

protect

the

power

supply. To

reset

the

power

supply

when

this

system

has operated.

it

is

necessary

to

switch

the print

er

power

OFF

by

a signal

from

the

external device.

correct

the

problem

in

the

faulty

component.

then

switch

the

power

back ON again .

2-28

•

•

CHAPTER 3

THE

MECHANICAL

SYSTEM

This

chapter

explains

mecha

nical operation. and disassembly and reassembly

of

the

print

er.

Note

the

following

precautions

during

dissas

em

bly

or

reassem

bly

.

1.

Remove

the

EP

-S

cart

r

idge

and

font

cartridge fr

om

the

printer

before

disassembling

or

tr

ansporting

it.

When

the

cartridge

is removed. be sure

to

close

the

light-blocki

ng

shutter

and

to

keep

the

cartridge

tn

its original

box

.

If

the

box

is

not

available,

cover

the

cartridge

with

a

cloth

or

put

it

in a

dark

place

to

prevent

light

from

affecting

the

drum

insi

de

the

cartridge

.

2. Disconnect

the

printer

from

the

wall

outlet

before

servicing it.

3.

Note

the

lengths.

diameters. and

locations

of

screws. Use

them

in

their

original

locations

when

reassembling

the

pnnter

.

4. Do

not

oper

ate

the

printer

w1th

any

part

removed.

5.

To

protect

the

laser

device

from

stat1c electnc1ty.

connect

the

shorting

connector

to

laser

connector

J202

when

J202

is

disconnected

.

6.

Assembly

IS

the

reverse

of

disassembly

unless

specifically

noted

.

I.

EX

T

ERNALS

.

.....

. . . . . .

...

......

3-1

A. Co

vers

and

Panels

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

B. Fan

......

.

.........

.

........

3-3

C.

Ozone

Filter

.................

3-3

D.

AC

Controller

Un

it .

..........

3-4

II.

DRIVE

SYSTEM

....

.

.....

.

.......

3-6

A. M

ai

n

Mo

t

or

Un

it

..........

.

..

3-6

Ill

. PAPER

TRANSPORT

SYSTEM

.....

3-7

A.

Pick

-

Up

Roller

Un

it

..

.

........

3-7

B. Feed Gu i

de

Unit

...

.

........

3-

10

IV

. EXPOSURE

SYSTEM

............

3-

11

A.

La

s

er

and

Scanner

Un

it

....

..

3-1

1

V.

ELECTROSTATIC

IMAGE

/

DEVELOPING

/CL

EANING

SYST

EM

.......................

3-

14

A.

EP

-S

Cartridge

..............

3-

14

B.

Transfer

Corona

Unit

........

3-

15

VI

.

FIXING

SYSTEM

.

...............

3-1 7

A. F

ix

ing

Unit

. .

......

.

.....

.

..

3-1 7

VII.

EL

ECT

RICAL

COMPONENTS

.....

3-

20

A. DC

Controlle

r

PCB

.......

.

..

3-

20

B. D

ri

ver

and

Sensor

PCB

and

Low

-

Volta

ge

Power

Supply

(

Sensor

/

Power

Supply

Uni

t)

.

3-

20

C.

Hi

gh

-

Vo

l

tage

Power

Suppl

y

..

3-21

D.

Si

gnal

Ground

PCB (

HVT

) . .

..

3-

22

E. Casset

te

Size

Sens

i

ng

Sw

itch

PCB

................

3-22

•

•

•

I.

EXTERNALS

A.

Covers

and

Panels

Upper

cover

(2)

Lower

cover

(8)

Front

bottom

cover

(2)

Base

cove

r ( 1 4)

Delivery

unit

cover

(

1)

Figure 3-1

Note

:

Throughout

this

section. a number

enclosed

in

parentheses

represents

the

number

of

screws

to

be

removed

or

loosen

ed in

the

corresponding

step

.

When

cleaning

inside

the

printer.

or inspect-

ing

or

repairing it.

remove

appropriate

covers

and/

or

panels as

described

below. The

pro-

cedure

for

removing a cover

that

can

be

taken

off

simply

by

removing

screws

is

omitted.

1 .

Upper

cov

er

1) Open the printer.

2) Remove

the

two

screws

from

the

upper

cove

r.

CD

Screws

®

Upper

cover

Figure

3-2

3) Push

up

on

the

upper cover

with

both

hands

to

release

the

four

round

tabs

from

the

holes.

then

push

the

cover

backward

to

release

the

other

two

tabs. and

remove

the

cover

.

2.

Lower

cover

1)

Remove

the

upper

cover

. (2)

2)

Open

the

delivery

unit. and

remove

the

AC

wiring

cover

. ( 1 )

3)

Remove

the

two

screws

that

secure

the

lower

cover

.

CD

Screws

®

AC

wiring

cover

Figure

3-3

4)

Open

the

printer

.

5)

Remove

the

six

screws

that

secure

the

lower

cover

and

remove

the

lower cove

r.

CD

Screws

®

Lower

cover

Figure

3-4

3-1

•

•

3. Base

cover

1)

Lay

the

pnnter

on

the

pick-up

unit

side.

Figure

3-5

2)

Remove

the

fourte

en

screws

and

r

emove

the

base

cove

r.

CD

Screws

Figure 3-6

3- 2

4.

Front

bottom

cove

r

(blanking

plate

for

the

test

connector

slot

and

TEST

PRINT

button

).

1) R

emove

the

uppe

r

cov

er.

2) R

emove

the

two

screws

and

remove

the

front

buttom

cove

r .

CD

Sc

r

ews

Fi

gure

3-7

B. Fan

(F

M1)

1)

Open

the

pr

i

nter

.

21

Remove

the

upper

cov

er

and

lo

wer

cover

.

31

Remove

th

e ozone

filte

r.

41

Remove the

th

ree

screws

and

remove

the

•

fan

mounting

plate.

•

•

Q)

Ozone

filter

®

Sc

rews

Figure

3-8

51

Disconnect

the

connecto

r

(J

1

53).

6) Remove

the

two

screws

and

remove

the

fa

n-motor

unit

(F

M 1

I

.

<D

Screws

®

Fa

n-motor

unit

(FM 1)

Figure

3-9

C.

Ozone

Filter

1)

Open

the printer.

21

Replace

th

e ozone

filt

er.

<D

Ozone

filter

Figure

3-

10

3-3

•

•

•

D.

AC

Controller

Unit

1.

Conf

iguratiOn

The

AC

controlle

r

unit

is

connected

to

the

AC

power

lines .

It

1s

configured

as

shown

below

.

I

--------------

~

CD

AC

controlle

r

PCB

,

~

.,

0

~

@

Safety

PCB

Figure

3-11

2.

Remo

ving

the

AC

cont

roller

un

it

1

l

Open

the

pnnter

.

2) Remove

the

upper

cover

and

lowe

r

unit

.

3)

Disconnect

the

connector

(J

1 1 2).

CD

Connector

(J

11

2)

Figure

3-

12

3-4

4) Rem

ove

the

ozone

filter

.

5) R

emove

the

fan

mounting

plate

. (3)

CD

Ozone

filter

®

Screws

Figure

3·

13

6)

Disconne

ct

the

connector

(

J601

).

7)

Remove

the

three

scr

ews

and r

emove

the

AC

cont

roller

unit

fr

om

the

base

plate

.

CD

Co

nn

ector

(J601)

®

Screws

Figure

3-

14

•

•

•

3.

D1sassembly

and

reassembly

1

l

Remove

the

four

screws

.

CD

Screws

@

Safety

PCB

Figure

3-

15

2)

Remove

the

connector

{J

1

52

)

from

the

AC

controller

PCB and

separate

the

safety

PCB

from

the

AC

controller

PCB.

3)

Remove

the

two

screws

and

remove

the

safety

PCB .

CD

Connector

(J

1

52)

®

Screws

@

Safety

PCB

Figure

3-16

4)

Remove

the

two

screws

and

remove

the

AC

controller

PCB

from

the

PCB

cover

I

-

.

--

--

~

-,

'I

CD

Screws

®

AC

controller

PCB

Figu

re

3-

17

5)

Remove

the

three

screws

and

two

spade

terminals. di

sconnect

the

conn

ector

. and

separate

the

AC

controlle

r PCB.

I

CD

Screws

®

Connector

®

Spade

terminals

®

AC

controller

PCB

Figure

3-1 8

3-5

•

•

•

II.

DRIVE

SYSTEM

A.

Main

Motor

Un

it

1.

Configuration
Th

e

mam

motor

drives

the

photosensitive

drum.

fixing

rollers.

and

delivery

rollers.

It

is

con-

figured

as

shown

below

.

I

.

,,

-----

I

CD

Main

motor

Figure

3-19

2. Removing

the

main

motor

unit

1)

Open

the

pnnter

.

2) Remove

the

upper

cover

and

lower

cover

.

3) Remove

the

sensor/

power

supply

unit.

4) Remove

the

p1ck-up

roller

unit.

5) Remove

the

feed

guide

unit.

6) Remove

the

fixing

unit.

7)

Remove the seven

screws.

disconnect

the

two

connecto

rs. and

remove

the

main

motor

unit.

CD

Screws

®

Main

motor

unit

(i)

Connecto

rs

Figure 3-

20

3-6

3.

Disassembly

and

reassembly

1)

Remove

the

four

screws

and the sheet.

then

separate

the

main

motor

from

1ts

mount.

CD

Screws

(i)

Sheet

®

Main

motor

Figure

3-21

•

•

•

Ill

.

PAPER

TRANSPORT

SYSTEM

A.

Pick

-

Up

Roller

Unit

1.

Removing

the

pick-up

roller

unit

1)

Open

the

pnnter

.

2)

Remove

the

upper

cover

and

lower

cover

.

3 )

Remove

the

sensor

/

power

supply

unit

.

4 )

Remove

the

three

screws

and

remove

the

t

wo

spnngs

.

the

upper

transfer

gu

i

de

. and

t

he

l

ower

transfer

gutde

.

CD

Screws

®

Springs

®

Upper

transfer

guide

®

Lower

transfe

r

gu

i

de

Figure

3-

22

5)

Remove

the

four

screws

and

remove

the

pt

ck

-

up

roller

unit.

CD

Screws

®

Auxiliary

feed

roller

®

Pick-up

roller

unit

Figure

3-

23

Note

:

When

removing

the

pick-up

unit.

be

es-

pecially careful

,

not

to

press

or

force

the

auxilia

ry

feed roller.

fo

r its

mounts

ca

n

easily be damaged. and

its

position

must

be

set

accurate using special gauges .

2. Dtsassembly and reassembly
a. Pi

ck

-

up

roller

1)

Remove

the

E-ring and

two

bushtngs. and

remove

the pi

ck-up

roller and pi

ck-up

roller

shaft

together

.

. y

CD

E-ring

®

Bushings

®

Pick-up

roller

Figure

3-24

2)

Remove

the

E-ring , then aux iliary rollers

and

2.

from

the

pi

ck-up

roller

shaft.

3)

Remove

the

pi

ck

-

up

roller.

CD

E-ring

®

Auxiliary roller

1

®

Auxil

iary roller

2

®

Pi

ck-up

roller

Figure

3-25

3-7

•

•

•

Note:
When

installing

the

pick-up

roller, be sure

to

pos

ition

the

roller

and

auxiliary roller 2

as

shown

below

.

G)

Pick-up

roller

shaft

@

Aux

iliary roller 1

@

Aux

iliary rolle r 2

® Pic

k-up

roller

@

Pick-up

roller

clutch

Figure

3-26

Note:
The

pick-up

roller

and

pick-up

roller

clutch

are

mounted

on

the

pick-up

roller

shaft

at

particular

positions. The

pick-up

roller can

easily be replaced

and

returned

to its

origi-

nal

position.

However.

a special

gauge

is

required

to

locate

the

clutch

at

the

correct
position.
For

this

reason. never replace

the

pick-up

roller

clutch

in

the

field

nor

apply

any

force

to

the

clutch

.

3-8

b. Separation pad

1)

Remove

the

E-ring and

two

bushings and

remove

the

pick-up

roller and

pick-up

roller

shaft

together.

<D

E-ring

® Bushings

@

Pick-up

roller

Figure

3-27

2)

Remove

the

two

screws.

then

remove

the

separation

pad

from

the

lower pick-up

guide

.

<D

Screws

@

Lower

pick-up guide

@ Separation pad

Figure

3-28

•

•

•

c. Registration rollers

1)

Loosen

the

setscrew

that

secures the

clutch

drum

to

the

registration

roller

shaft.

2)

Remove

the

clutch

dr

um,

control

ring,

and

gear

together

from

the

reg1stration

roller

shaft

.

2

4

<D

Setscrew

®

Clutch

dr

um

@

Control

ring

®

Gear

Figure

3-29

3) Remove

the

spnng

.

<D

Spring

Figure

3-

30

4)

Remove

the

hold

down

spring and E-ring

and

then

remove

the

two

bushmgs

.

<D

Spring

®

E-ring

@

Bushings

Figure

3-31

5)

Mark

the

holes

in

which

the

hold-down

spring is

mounted.

then

remove

the

spnng

,

E-ring ,

gear

and

bushing

.

<D

Spring

®

E-ring

@

Gear

®

Bush

ing

Figure 3-

32

3-9

•

•

•

6) Remove

the

upper

pick

-u p

gu

i

de

and

the

upper

registratiOn roller

together

.

'l

----

.

•

CD

Upper

pick-up

guide

@

Uppe

r

registratio

n

roller

Figure 3-

33

7) Remove

the

two

E-rings

and

remove

the

gear

and

bushmg

.

CD

E-rings

@

Gear

3-

10

@

Bush

ing

Figure 3-

34

8) Remove

the

t

wo

E-rings and bushings

9) Remove the l

ower

reg1stration roller.

CD

E-rings

@

Bu

shi

n

gs

@

Lower

registration

roller

Figure 3-

35

B.

Feed

Guide

Un

it

1.

Removing

the

transfer

guide

unit

1 )

0

pen

the

pr

i

nter

2) Remo

ve

the

upper

cover

and

lowe

r

cover

.

3) R

emove

the

three

screws

and

remove

the

tr

an

sfe

r guide

unit

.

CD

Scr

e

ws

@

Tr

ansfe

r

gu

i

de

Figu

re

3-

36

•

•

•

IV

.

EXPOSURE

SYSTEM

A. L

ase

r

and

S

ca

nner

Unit

1.

Configuration
The

laser

and scanner unit

sweeps

a

laser

beam

across

the

photosensitive

drum

.

It

is

con-

fi

gured

as

shown

below

.

\

CD

Scannmg

motor

unit

®

Laser unrt

®

Laser PCB

@

Laser

power

tester

slot

Figure

3-

37

2.

Removing

the

laser

and scanner unrt

1)

Open

the

pr

i

nter

.

2)

Remove

the

uppe

r

cover

.

I

3) Remove

the

two

screws

and

the

blocks

holding

the

lampboard

/scanne r u

nit

housing,

then

remove

the

hous

i

ng

.

CD

Blocks

®

Screws

®

L

ampboard

/

stanne

r

unit

housing

Figure

3-

38

4)

Disconnect

the

connector

(

J451)

from

the

laser

PCB.

5)

Open

the

scanner

motor

lid

and

disconnect

the

connector

(

J40

1

l.

Q)

Connector

(J

45

1)

®

Connecto

r

(J40

1

l

®

Scanner

motor

lid

F

ig

ure

3-

39

6) R

emove

the

two

sc

re

ws

and

open

the

lid.

CD

Screws

®

Lid

Figure

3-40

3-11

•

•

•

•

7)

Pull

the

optical

fi

ber

un1t

out

of

the

c

on-

n

ector

.

CD

Connector

®

Opt

i

cal

fi

ber

Figure

3-41

8)

Remove

the

four

screws

and separate

the

laser

and

scanner

unit.

CD

Screws

®

Laser

dnd

scanner

unit

Figure

3-42

Note:
Do

not

disassemble

the

laser

and

scanner

unit.

It

is

not

field-adjustable

.

3-12

B.

Precond

itioning

Exposure

Lampboard

1.

Remov

i

ng

the

preco

n

dit

i

on

i

ng

expos

ure

lampboard

1)

Open

the

printer

.

2)

Remove

the

upper

co

ver

.

3)

Remove

the

two

screws

and t

he

bloc

ks

holding

the

lampboard

/

scanner

unit

hous

-

ing. then

remove

the

hous

i

ng

.

CD

Blocks

®

Screws

®

L

ampboard

/scanner

un1t

hous

ing

Figure

3-43

4)

Remove

the

grounding

spring

and

discon-

nect

the

connector

(

J801

) .

CD

Grounding

spnng

®

Connector

(J80

1)

Figure

3-44

•

•

•

5)

Ra

ise the

lampboard

/

scanr

=:

;

unit

housing

.

6)

Remove

the

two

screws

and

remove

the

preconditioning

exposure

lampboard

unit

.

<D

Screws

®

Preconditioning

exposure

la

mpboard

unit

Figure 3-

45

7)

Remove

the

preconditioning

exposure

unit

cove

r

plate

.

then

remove

the

precondition-

i

ng

exposure

lampboard

. (1)

3-13

•

•

•

V.

ELECTROSTATIC

IMAG':

~EVELOPING/CLEANING

SYSTEM

A. EP-S

Cartridge

1 .

Configuration
The EP-S cartridge

combines a photosensitive

drum,

primary

corona unit. developing unit. and

drum

cleaning

unit

in one housing, and is replaced

as

a unit. During printing

the

drum

rotates and

an

invisible

e

lectrostat

ic latent image is

formed

on its surface. then developed i

nto

a visible i

mage

by

toner

. The lat-

t

er

is transferred

to

paper

to

make

the print.

The EP-S cartridge

cannot

be

disassembled.

---.

-- - - - - - - - - - - -

..

:: -- - - _,

6

CD

Light-blocking

shutter

1

®

Light-blocking

shutter

2

® Developi

ng

unit

® Photosensitive

drum

.,

® Protective shield

® Primary corona

unit

CD

Drum cleaning un1t

Figure 3-4

6

a. Protective shield

-- --

~

The

photosensitive

drum

is

protected

by

a protective shield

that

prevents exposure

to

strong light. If it

were

exposed

to strong

light

for a long

period. blank areas

or

black streaks

might

appear on

prints

. Do

not

open

the

protective

shield unless necessary . (The

protective

shield is

automatically

opened

when

the

EP-S

cartridge

is inserted

into

the

printer

and

the

upper

unit

is lowered.)

b.

Light-blocking

shutters

The

photosensitive

drum

is

also

protected

by

the

light-blocking

shutters

. These shutters prevent

light

entering via

the

laser beam

path

(above

the

drum)

when

the

cartridge

is removed

from

the

printer

.

3-14

•

•

•

2. Cleanmg

the

photosensit

i

vP

:u

m

1)

Open

the

pnnter

ana

remove

the

EP-S

cartr

i

dge

.

2)

Turn

the

EP

-S

c

artredge

upside

down

and

open

the

protective

shield

.

3)

L1berally

sprinkle

toner

on

a piece

of

flannel

or

other

soft

cloth

and clean

the

drum

sur-

face w1th it.

Note

:

1.

Be

sure

to

turn

the

drum

only

in

the

di-

rection

that

it turns

dunng

pr

i

nting

.

If

the

drum

IS

turned

backward.

the

spring-

loaded

contact

that

conducts

the

devel-

oping

bias

to

the

inside

rim

of

the

devel-

oping

cylinder

will

be

bent

.

2.

Use

flannel o r

other

soft

cloth

to

clean

the

drum

surface

.

Lint-free

paper

is

too

hard

and

will

scratch

the

surface.

3. Finish cleaning

as

quickly

as

possible

to

avoid

long

exposure

of

the

drum

to

light.

for

this

can cause

abnormal

images.

4.

Never

use

solvents

for

cleaning

the

dr

um

.

B.

Transfer

Corona

Unit

1.

Removing

the

transfer

corona

unit

1}

Open

the

printer

.

2}

Remove

the

upper

cover

and

lower

cover

.

3)

Remove

the

sensor

1

powe

r

supply

unit.

4}

Remove

the

pick-up

roller

unit

.

5}

Remove

the

two

screws

and

remove

the

high-voltage

connector

unit.

CD

Screws

®

High-voltage

con

ne

ctor

unit

Figure

3-

47

6)

Remove

the

two

screws

and

take

out

the

transfer

corona

un

it.

CD

Screws

®

Transfer

corona

unit

Figure

3-48

2.

Stringing

the

corona

wire

1)

Remove

the

right and

left

covers

from

the

corona

unit.

2)

Cut

off

about

300mm

of

corona

wire.

Form

the

corona

w1re

as

shown

in Figure

3-

49

.

.....,

oJmm

I Less than

Sm

m

E

E

-

.: 17 _

•l

5m

m

Figure

3-

49

(Form a

3-inm

loop

at

each

end

by

wrap

-

ping

it

around

a

small

hex

key

and

then

twisting

it

four

or

five

times

.

Snip

off

the

loose

ends

to

less

than

1

mm.}

3}

Hook

one

of

the

loops

ove

r

the

ri

ght

stud

and

put

the

wire

in

the

V-groove

10

the

stud

.

4}

Hook

one

end

of

the

spr

i

ng

in

the

other

loop

.

then

the

ot

her

end

of

the

spring

on

the

spnng

hanger

.

Figure

3-50

3-15

•

•

•

Note

:

The

corona

wire

should

not

be bent.

twisted.

or

kinked

.

It

also

should

be clean

and

smooth

. Clean

the

corona

wire

with

a

cotton

swa

b (p

ro-

vi

ded

with

the

EP-S

cartridge)

dampened

wi

th

alcohol.

3. W inding

the

nylon

line

on

the

transfer

co

r-

ona

un1t

1

l

Prepare

about

850mm

nylon

line.

2)

Wind

one

end

of

the

nylon

line

around

screw

A

of

the

transfe

r

co

rona unit.

(See

Figure

3-51

.)

3)

W i

nd

the

nylon

line

tightly

around

the

cor-

ona

unit

as

shown

in

Figure

3-51

,

the

n

wind

the

other

end

around

screw

8.

Caution

:

Be

careful

that

the

nylon

line

does

not

to

uch

the

discharging

need les.

fo

r

it

may

be

damage

d.

3-16

N yl

on

lo

ne

Screw A ,

Screw

B

,

F

ig

ure

3-

51

•

•

•

VI.

FIXING

SYSTEM

A. F

ix

ing

Un it

1.

Configuration
The

fixing

unit

fixes

the

tone

~

i

mag~

onto

the

paper (makes

it

permanent) .

It

ts

conf

t

gured

as

shown

below

.

r

CD

Upper

delivery roller

®

Upper

fixing

roller

@

Fixtng roller

heater

<!)

Ther

moswttch

®

Fixing untt

entry

gui

de

®

Lower

fixing

roller

(j)

Lower

delivery roller

Figure

3-

52

2. R

emoving

the

ftxing

unit

1)

Open

the

pri

nter

.

2) Rem

ove

the

uppe

r cover.

lower

cover

. and

delive

ry

uni

t

cove

r .

3)

Remove

the

fixing

roller cleaner.

4) D

isco

nnect

the

connector

(

J851)

and re -

move

the

fou

r

screws

.

CD

Screws

®

Conn e

cto

r (

J851

)

Figure

3-

53

5)

Disconnect

the

connector

(J

1 1 2).

CD

Connector

(J

11 2)

Fi

gure

3-

54

6) Ta

ke

out

the

fixin

g

unit

th

ro

ugh

the

deli

v-

ery

outlet.

3-17

•

•

•

3. Disassembly and reassembly
a. Fixing

roller

heater

1)

Remove

the

two

screws

and

remove

the

delivery

untt

paper sensor

mounting

plate .

L

CD

Screws

@

Mo

u

nting

plate

Figure

3-

55

2)

Remove

the

screw

and

remove

the

left

ter-

mtnal

cover

.

CD

Screw

@

Left

te

rm

inal

cover

Figure 3-

56

3-18

3) Remove

the

three

screws and remove the

lead

wire and

left

terminal holder.

CD

Screws

®

Left

terminal

holder

Figure 3-

57

4) Remove

the

screw

and remove

the

right

terminal

cover

and spring.

CD

Scr

ew

@

Spring

®

Right

termioal

holder

Figure 3-

58

•

•

•

5) Remove

the

three

screws

and

remove

the

lead

wire

and ri

ght

terminal

holde

r.

CD

Screws

®

Right

terminal

holder

Figure

3-59

6 )

Remove

the

lead

term

inal

connected

to

the

fi

x1ng

roller

heater

from

the

connector

(J

11 2).

7)

Remove

the

screw

and

remove

the

left

ter-

minal

cover

.

\.

<D

Connector

(J

1 1

2)

®

Screw

@

Left

heater

cover

@

Fixi

ng

roller

heater

Figure

3-

60

l

j)

8)

Pull

the

fixing

roller

heater

ca

ref

ully

out

of

the

upper

roller

.

b.

Thermoswitch

and

thermistor

1)

Remove

the

left

term

inal

cover

(

1)

and

ri

ght

term

inal

cover

(

1).

2)

Remove

the

four

screws

and

remove

t

he

lead

wire

and

the

upper

entry

gu

i

de

.

CD

Screws

®

Upper

entry

guide

Figure

3-61

3)

Remove

the

two

screws

and

remove

the

thermosw1tch

.

or

remove

the

screw

and

re-

move

the

thermistor

.

t

...

~

_

..

···

- ·

•

<D

Screws

@

Thermistor

®

Thermoswitch

Figure

3-

62

3-19

•

•

•

VII

.

ELECTRICAL

COMPONENTS

A. DC

Controller

PCB

1)

Remove

th

e base

cov

er. (

1

4)

2)

Di

sconnect

the

con

nector

and

remove

the

three

sc~ews

and

the

i

nterface

PCB.

CD

Conn

ector

®

Screws

@

Int

erface

PCB

Figure

3-

63

3)

Disconnect

the

following

connectors

fro

m

the

DC

cont

r

oller

PCB.

CD

J2

14

®

J21

5

@

J208

@

J216

3-20

®

J202

@

J203

(!)

J206

®

J201

Figure

3-

64

®

J21

1

~

J21

7

Q])

J2,

3

4) Remove

the

two

screws

holding

the

con-

ne

cto

r and the

four

screws

holding

the

DC

co

ntroller

PCB.

5)

Separate

the

DC

cont

roller

PCB

from

the

main

unit

.

I

CD

Screws

@

DC

cont

roller

PCB

®

Connector

Figure

3-65

B.

Driver

and

Sensor

PCB and

low-Voltage

Power

Supply

(

Sensor

/

Power

Supply

Unit)

1)

Open

the

printer

.

2)

Remove

the

upper

cov

er

and

lower

cove

r.

3)

Remove

the

ozone

filte

r.

4)

Remove

th

e

three

sc

rews

and

remove

the

fan

mou

nting

plate.

CD

Ozone

filter

®

Screws

F

ig

ure

3-66

•

•

•

5)

Remove

the

four

screws

and

disconnect

the

connector

CD

Screws

®

Connecto

r

Figure

3

-6

7

6)

Check

that

there

IS

no

cassette

in

the

pnnter

then

separate

the

sensor

;

power

supply

unit

from

the

connecto

r

by

lifting

1t

with

both

hands

.

7)

Remove

the

fou

r

screws

and separate th e

dnve

r

and

sensor

PCB

from

the

low-

voltage

power

supply

.

3

--

-

CD

Screws

®

Driver

and

sensor

PCB

@

Low-volta

ge

power

sup

p

ly

Figure 3-

68

C.

High

-Voltage

Po

wer

Suppl

y

1)

Open

the

pnnter

.

2)

Remove

the

upper

cover

and

lower

cover

.

3)

Remove

the

two

screws

and

remove

the

high-voltage

connector

unit.

CD

Screws

®

High-voltage

connector

unit

Figure

3-

69

4)

Remove

the

two

screws.

disconnect

the

conn

ec

tor.

and

remove

the

high-voltage

power

supply

.

CD

Screws

®

Connector

Figure

3-70

3-21

•

•

•

D.

Sig

nal

Ground

PCB

(HVT)

1)

Open

the

pr

i

nter

.

2) Remove

the

upper

cove

r

and

lower

cover

.

3) Remove

the

senso r/

power

supply

.

4)

Remove

the

p1ck

-

up

roller unit.

5) Remove

the

high-voltage

connector

unit.

6) Remove

the

transfer

corona

unit

.

7) Remove

the

two

screws

and

remove

the

s1gnal

ground

PC

B

(HVT).

CD

Screws

@

Signal

ground

PCB

(HVT)

Figure

3-71

E. C

ass

et

te

Si

ze

Sens

in

g

Sw

it ch PCB

1)

Open

the pr

inter

.

2) Remove

the

upper

cover

and

l

ower

cover

.

3) Remove the

sensor

t

powe

r

supply

.

4) Remove

the

fou

r sc

rew

s

and

the

HVT

unit.

CD

Screws

®

HVT

uni

t

Fi

gure

3-

72

3-22

5)

Remove

the

two

screws

and

remove

the

c

assette

gu1de.

CD

Screws

®

Cassette

gu1de

Fig

ur

e 3-

73

6)

Disconnect

the

connector

and

remove

the

sc

rew.

then

remove

the

cassette size

sen-

sin

g

switch

PC

B.

<D

Connector

®

Scre

w

@

Casse

tte

size sensing

switch

PCB

Figure

3-

74

•

•

-·--

-------

-

-----

----

CHAPTER4

INSTALLATION

Each

printer

is

carefully

adjusted

and

striclty

inspected

be

f

ore

shipment

.

To

ensure

that

it

perfo

r

ms

as

intended.

it

is very im

portant

to

install

the

printer

correctly

.

The serviceman

should

have

a

complete

knowledge

of

the

printer

,

choose

a

good

locatton.

and

check

the

pr

in

ter

out

before

it is used .

I.

CHOOSING

A

LOCATION

.........

4-1

A .

Storage

of

Sealed

•

II.
Ill

.

UNPACKING

AND

INSTALLATION

.

4-2

STORAGE

AND

HANDLING

OF

EP-S CARTRIDGES

.....

.

.........

4-5

EP

-S

Cartr

i

dges

. . .

...........

4-5

B.

Storage

of

Un

sealed

EP

-S

Cartridges

..............

4-5

c.

Ha

ndl

i

ng

Su

g

gest

i

ons

........

4-5

•

•

•

I.

CHOOSING

A

LOCATION

The

servtceman

sho

uld

mspect

the

planned

lo

ca

tion

before

delivery

.

The

follow

i

ng

requir

e-

ments

sho

uld

be

met

when

i

nstalling

the

prin

ter

:

•

The

line

voltage

should

not

vary

more

than

±

1

0%

fro

m the

voltage

marked

on

the

pnnte

r

ratmg

plate

.

Th

e

c1

r

cu

1t

shoul

d

hav

e

s

uff

ict

ent

cu

rrent

capa

ctty

.

•

The

temperatu

re

should

be

between

1

oo

to

3

2.5°C (

50

°

to

91

o F)

and

the

relative

humtdity

shou

ld

be

between

20

%

to

80

%.

There

should

be

no

w

ater

faucet.

hu

midif

i

er

.

or

atr condtt1onmg

outle

t n

ear

the

printer.

•

The

printer

sho

uld

not

be

exposed

to

open

fla

me

s.

dust.

am

monia

fumes.

or

di

r

ect

sun-

light

.

If

it

has

to

be

placed

in a

sunny

place.

the

wmd

ow s

sho

uld be curtained

to

a

void

direct

su

nlight.

•

The

location

sho

uld be

well

ventilated

.

•

The

pnnter

s

hould

be

placed

on

a

sturdy

,

level s

urface

.

•

There

should

be an

enough

spac

e

around

the

pnnte

r

for

easy

operation.

(See Fi

gure

4-

1.)

Note

:

If

th

e

pnnter

(i

n

the

shipping

carton)

is

moved

from

a

cold

storage

space

i

nto

a

wa

rm

room

.

co

ndesant10n

woul

d

occur

i

n-

side

the

pnnter

if it

were

exposed

to

room

air.

This

would

ca

use

various

temporary

problems

.

such

as

pnnt

defects

.

If

a pri

nter

has

been

stored

in

such

condi

t

io

ns

.

be

sure

to

allow

1t

to

com

e to

room

t

emp

erature

before

unpacking

it.

This

w1ll

take

on

e

hou

r

or

more

.

Front

so

de

-........,.,

150mm

or

more

~

r-:--:--

I

1

350

mm

or

more

1

~1

t

100mm

or

more

r-1

I

'

L

__

_j

350mm

or

mo

re

Fi

gur

e 4-1

4- 1

•

•

•

II.

UNPACKING

AND

INSTALLATION

No

. I

Step

1 ! Open the car

dboard

box

.

I

2

. Li

ft

off

the upper

foam

packing.

3 Remove the

parts

and literature.

'

I

4 Lift

off

the mi

ddle

foam

packing

and

remove

the pri

nter

.

5

I Remove the plastic bag

from

around the pri

nter

.

Remove

the

tape

securi

ng

c

omponents

.

Car

dboard

box

4-2

l

Check

I

Remarks

I

' See Figure

4-2

.

I

I

See Figure

4-2

.

! Check

that

the

following

are

I

present:

I

·Cassette

I

· Delivery tray

I

!

·Power

cord

I

· I

nterface

cable

:

I

I

l

I

1 Check

for

damage

to

the

exterior

I

I

1

of

covers and panels

during

1

shi

pment

.

'

Table

4-1

Middle pack

ing

I

Figure

4 -2.

I

Cassette

\

U

pper pack

1ng \

Fi

lament

tape

,

cassette oack1ng

No

Step

Check

Remarks

6

Remove

the

cardboard

packmg

See

F

igure

4-3

.

from

the

cassette

holder

and

rem

ove

the

protecttve

sheet.

•

7

Open

the

pr

in

ter

.

and

remove

the

See

Figure

4-3

.

i

nternal

pack

ing.

8

Remove

the

two

spacers

See

Figure

4-4

.

9

Open

the

small

box

containing

Confirm

that

the

following

items

See

Figure

4-5

.

the

EP

-S

cartndge

and

take

out

are

present

:

the

cartrrdge.

Remove

the

·

Fixing

roller

cleaning

pad

aluminum

bag.

·Co

tton

swab

·Inst

ruct

tons

for

cartndge

·ln

structtons

for

ustng

fixing

roller

cleantng pad

·

Inst

ruct

ions

for

ustng

cotton

swab

10

Hold

the

cartridge

horizontal

with

See

Fi

g

ure

4-6

.

both

hands and

slowly

rock

it

about

the

axis

of

the

drum

45

degrees each

way

five

ttmes

to

dtstribute

toner

evenly

.

Table

4

-2

•

Figure

4-3

CD

Spacers

Figu

re

4-4

/

cartndge

box

a

.

v

•

Figure

4-6

Figure 4-5

4

-3

I

Check

I

Remarks

No.

Step

1 1

! Install

the

cartndge

in

the

pnnte

r.

I

Flex

the tab

of

the

seal

up

and

I

down

until

it

breaks free.

then

pull

out

the

seal.

12

Take

the

fixing

roller cleanmg

unit

out

of

the

plastic

bag,

•

Remove

the

felt

fr

om

the

end

of

the

cleaner and install

the

cleaner

10

the

fi

xeng

umt

.

13

Cl

ose

the

pnnter

.

'

14

Remove

the

fi

lament

tape

and

·Check

that

the

paper-s1ze

1

See

Figure

5·2

.

cassette

packing

from

the

identification

slider is

to

the

cassette

.

correct

position

(

A4

or

Letter) .

Move

the

guide plate

to

suit

the

I

paper

s1ze

and

set

the

paper-size

I

I

dentification

slider.

Put

paper

in

I

I

I

I

the

cassette.

put

the

cover

on

the

I

I

cassette. then

put

the

cassette

10

I

I

the

prmter.

I

I

1 5

Connect

the

pnnter

to

the

I

I

external device.

I

16

Set

the

voltage

selector

to

su

1t

I

the

hne

voltage

.

1 7 Remove

the

cover

on

the

front

·Check

that

the

print

density

si

de

of

the

base

cover

.

Plug

in

the

adjustment

dial is set

to

the

" 5"

I

power

cord

.

After

the

pnnter

position

.

•

power

has been

sw1tched ON

by

·Check

that

the

test

print

has

the

a

s1gnal

from

the

external

dev1ce

correct

dens1ty.

I

and

the

ROY s1gnal

has been

made

TRUE

by

the

printer

. and

press

the

test

pnnt

button

to

make

one

test

pnnt

.

18

Clean

up

around the

pnnter

.

I

I

Table

4-3

•

4-4

•

•

•

Ill.

STORAGE

AND

HANDLING

OF

EP-S

CAR

TRID

GES

An EP-S

cartridge

is

affected

by

the

storage

conditions.

even

if it

is sealed in its

package. so

1ts

life

depends

on

the

way

in

which

it is used

or

stored

. EP-S

cartridges

should

be

handled

care-

fully

.

A.

Storage

of

Sealed

EP-S

Cartridges

In a

warehouse

or

workshop.

EP

-S

cartridges

should

be

stored

under

the

condi-

ti

ons

in Table

4-4

.

Note

the

following

:

1)

Avo

id di

rect

sunlight.

2)

Do

not

store

cartridges

on a surface

that

is

subject

to

vibration

.

3)

Do

not

strike

or

drop

packages

containing

cartndges.

"'

Normal ltolal

sl orage to

me

.. 9

101

I

o -

35

• c

a;

~

Seve

re

I

Ho

gh j

35

- 4o • c

2

"'

.,

=

(t

otal

storage to

me

-<

I I

OJ

I Low I

~

.:::

-

20-

O"C

40•C-1

5' C

Tem

perat

ure change (w o

tho

n 3 monu

tes or

sol

I _ 20,C_

25

'C

,

:;

j Norm

al lto

lal stor

age

tome

;<.

9 1

01

1 3 5 - BS

't

oRH

>

.-:;

~

~

I

Se

vere I Ho

gh I 85 -g5

=•o

RH

1)

"

r--+

'

----

--1

a: ~ ; h ot

al storage tome

x I 101 j Low j 1 o -

35

%RH

Aor

pressure

Toral s

torage

tome

Note:

460- 760mmHg

(0 6 to 1 at

m)

I 2 5 v

ears

"

Total

storage

time

" in

the

Table is a reference

to

the

cartridge

service

life

information

shown

on

the

outside

of

the

EP-S

cartridge

box

.

Ta

ble 4-4

Storage conditions

B.

Storage

of

Unsealed

EP-S Car

tridges

Each EP-S

cartridge

houses a photosensi-

tive

drum

that

has an

organic

photoconductor

(OPC). This

deteriorates

when

exposed

to

strong

light. The

cartridge

also

contains

toner

.

The

customer

should

be

fully

informed

about

correct

storage

and

handling

of

EP-S

cartridges

.

1.

Storage

requirements

1)

Avoid

places

exposed

to

direct

sunlight

or

near a window.

Do

not

leave an EP-S

cartridge

in a

car

for

an

extended

period

in

warm

weather

because

the

interior

tem-

perature

may

become

excessively

high

.

2)

Avoid

places wi

th

too-high

or

too-low

temperature

and/

or

humidity.

Also

avoid

places

exposed

to

sudden

temperature

changes (such as

near

an air

conditioner

outlet)

.

3)

Avo

id

dusty

places

or

places

exposed

to

ammonia

.

4)

Do

not store

an EP-S ca

rtrige

abo

ve 40"C.

2.

Life

of

EP-S

cartridges

The

design

useful

service

life

of

an

EP-S

cartridge

is 2.5 years

from

the

date

of

manufac-

ture (printed

on the

cartridge

).

The lim1t (year

and

month) of life (date

of

manufacture

plus

2.5

years) is given on

both

the

EP-S

cartndge

box

and

cardboard

box. An EP-S

cartndge

older

than the exp1ry

date

can

be

expected

to

produ

ce

prints

of

reduced qual ity.

so a cartrdige

shou

ld

be used wi

thm

1ts

servi

ce

life

.

C.

H

andli

ng

Suggestions

1)

When

using a

new

EP-S cartridge.

hold

the

cartridge

horizontal.

and

slowly

rock

it

about

the

axis

of

the

drum

45

degrees

each

way

five

times

to

distribute

toner

evenly, as

shown

in Figure

4-7

. then install

it

in

the

printer. Using

any

method

other

than

this

may

result in t

oner

leakage

from

the

developing

unit

or

cleaning

unit

.

After

installing

the

new

cartridge.

print

three

to

five

pages

of

test

patterns

to

check

for

toner

leakage. Even

1f

toner

leakage

did

occur.

clean

prints

w1ll

be

pro

-

duced

after

the

print

test.

F

igure

4-7

When

ROY signal is TRUE. a

test

pattern

can be

print~d

by

pressing

the

test pri

nt

button.

2)

If

blank

spots

occur

on

prints

because

of

lack

of

toner,

rock

the

EP-S

cartridge

as

explained in

1

).

above.

to

distribute

toner

evenly.

3)

Do

not

invert

nor

stand

an EP-S

cartridge

on

end. as

shown

in

Figure

4-8.

Always

handle

it

gently.

4-5

•

•

•

X

I

J'

Figure

4-8

Never

place

a

cartridge

in

these

positions

4) Do

not

touch

the

surface

of

the

photosen-

S

itive

drum

when

the

protect

ive shi

eld

on

the

bottom

of

the

EP

-S

cartridge

is

opened

.

I

f

the

drum

surface

is

dirty,

clean

it

with

fannel

or

other

soft

cloth

spnnkled

liberally

w1th

toner

.

Do

not

use

dry

cloth

.

lint-free

paper.

or

solvents

.

5) Do

not

try

to

disassemble

a

cartndge

.

6) Do

not

subject

a

cartridge

to

vibration

or

shock

.

7) An EP-S

ca

rtridge

has

light-blocking

shut-

ters because

the

photosensitive

drum

is

sensitive

to

strong

light

.

If

the

EP-S

ca

rtridge

is

exposed

to

strong

light

for

a

long

per

iod.

however.

blank

spots

or

black

st

reaks

may

appear

on

prints

despite

these

.

If

this

happens.

stop

the

pr

i

nter

for

a

while.

This

will

usually

solve

the

problem.

Note

the

following

:

1.

Clear

pape

r

jams

and

change

the

cartridge

as qu

ickly

as

possible

to

mini-

mize

exposing

the

drum

to

light.

If

pos-

Sible, reduce

the

light

level

before

doing

these operat1ons.

2.

When

storing

an EP-S

cart

ri

dge

that

has

been used.

put

it

in

its

sto

rage

box.

or

cove

r

it

with

clot

h.

Do

not

le

ave

it

ex-

posed

to

light

.

4-6

Note

:

Normal

room

light

is

about

1

500

lux

.

Do

not

ex-

pose

t

he

ph

otosensitive

drum

to

light

of

this

In-

tensity

for

more

than 5

minutes

; if

the

drum

IS

placed

und

er these

conditions

accidentally

, the

cartridge

should

be

stored

in a

dark

place

to

" re-

cuperate

",

though

an i

mage

may

be retamed

on

the

drum

for

some

ti

me

.

Direct

sunlight

is

1

0.

000

to

30

.

000

lux

.

Expos-

ing a

drum

to

li

ght

at

th1s

intensity

will

destroy

1t

•

CHAPTER 5

MAINTENANCE

AND

SERVICING

•

•

I. PARTS REPLACEMENT SCHEDULE

5-1

II.

CONSUMABLES

.....

.

..

....

..

. . . 5-1

Ill

. LISTS OF TOOLS

.........

.

.......

5-2

IV

. LIST OF LUBRICANTS,

CLEANERS

...........

.

..

. ..

...

. . 5-4

V.

SERVICE CHECKPOINTS

..........

5-5

A.

Standard

Tools

. . . . . . . . .

..

...

5-2

VI.

MAINTENANCE

BY

CUSTOMER

...

5-7

B. Special

Tools

............

.

...

5-3

I.

PARTS

REPLACEMENT

SCHEDULE

None

II

.

CONSUMABLE$

•

None

•

•

5-1

Ill

. LISTS OF TOOLS

A. Standard Tools

The

standard

tools

required

for

servicing

the

printer

are

listed

below

.

•

I

:

No.

.

Tool

name

Tool

no

.

I

Remarks

I

1

I

Toolbox

I

TNK-0001

I

2

Jumper

wire

TK

N-0

069

'

I

3

I

Feeler

gauge

I

CK-0057

4

Compression

spnng

scale

I

CK-0058

!

For

checkmg

cassette

s

pnng

strength

(0-600g)

5

I

Phillips

screwdnver

I

CK-0101

M4.M5

6

Phillips

screwdriver

I

CK-0104

I

M3.M4

7

I

Phillips

screwdnver

I

CK-0105

M4.M5

8

Phillips

screwdnver

I

CK-01

06

M4.M5

9

Flat-blade

screwdriver

I

CK-0111

10

Prec1sion

flat-blade

screwdriver

set

CK-0114

I

~

l

1 1 . Allen

wrench

set

CK-0151

12

F1le.

fine

CK-0161

13 j Allen (hex)

key

CK-0170

I

M4

14

Diagonal

cuttmg

pliers

I

CK-0201

15 I Needle-nose pliers

I

CK-0202

i

16

Pliers

I

CK-0203

I

1 7

I

Retammg

nng

pliers

CK-0205

18

Crimper

CK-0218

19

'

Tweezers

CK-0302

20

i

Ruler

CK-0303

•

21

I

Mallet. plastiC head

CK-031

4

I

22

Brush

CK-0315

23

I

Penlight

CK-0327

24

Bottle. plast1c

CK-0328

1

00cc

25

I

Solder

CK-0329

cb1.5(mm)

x

1

(m)

26

Desoldering

w1ck

CK-0330

I

15mm

27

Oiler

CK-0349

30cc

28

I

Jar. plastic

CK-0351

I

30cc

29

Digital

logic

tester

CK-0400

30

Digital

multimeter

CK-0436

For

measunng

the

output

I

of

the

laser

power

tester

I

(TKN-0198)

etc

.

31

1

Soldenng

1ron

CK-0309

Table

5-1

•

5-2

B.

Special

Tools

In

addit1on

to

the

standard

tools.

the

follo

wmg

spec1al

tools

are requ1red

for

serv1c1ng

the

pnnter

•

No.

I

Tool name

Tool no.

Shape

Rank

Apphcat1on. remarks

1

1

Laser po

wer

TNK-0198

B

I

Used

w1th

pnnter dnver

tester

.

I

~=

and laser

dnver

tester

for

I

measunng

or

adjustmg

I

laser

power

I

I

I

:

2

I

Pnnter

dnvefl

'

RY9-0024

B

Test pnnter funct1on and

I

1

laser dnver

/

/

laser

power.

tester

'1

'¥

li

I

·

~

I

/

;

'i?

(ijl

0

r;.

v

of}

I

i

I

i

3

Laser

shortmg

RY9-0025

B

1

Protects the

laser

ch1p

of

!

conn

ector

I I

I

the printer

from

damage

'

I

I

by stat

iC

electricity

I

Table

5-2

Note

: Ranks

A

Each

se

rv

ice

technician

shoul

d

carry

one

with

him

.

B A

gro

up

of

five

ser

vice

technic

i

ans

sho

uld

share

one

.

C

Each

workshop

should

kee

p

one

.

•

•

5-3

•

•

•

IV .

LIST

OF

LUBRICANTS. SCLEANER

S

No

. j

Matenal

name

1 !

Alcohol

:

I

ethyl

(pure or

denatured)

or

isop

ropyl

(

pure

or

denatured)

·

2

1

MEK (

methyl

ethyl

ketone)

3

1

Heat-resistant

grease

I

4 ,

Lubncattng

Otl

'

5

Lubncatmg

oil

I

1

Components

1

c ,H,

OH.ICH;

,cHoH

I

I

Heat-reststant

grease.

• e.g.

582M

Rhone-Poulenc

group

1

I

SO

VG

68

oil. ESSO

, Febis

K68.

MOBIL

I

Vactra

otl no. 2. SHELL

Tonna

oil

T68

I

SO

VG

220

otl. ESSO

Febis

K220.

MOBIL

Vactra

oil no.

4.

SHELL

,

Tonna

oil

T220

Use

Cleanmg :

1

plastic. rubber. external

I

parts

Cleamng :

I

011

and

toner

statns

'

I

i

Apply

to

dnve

'

mechanism

Forbeanngs

Registration

roller

clutch

spring

Table

5-3

5-4

Remarks

I

•

Purchase locally

•

Flammable

:

I

I

Keep

away

from

flame

• Purchase l

ocally

I •

Highly

flammable

:

keep

away

from

fl

ame

, •

Toolno.CK-0427

(500g

can)

• Equivalent grease
may

be used (heat

reststance

more

than

200°C)

•

Tool no.

CK-0451

l

(500

g can)

• Equivalent otl

may

be

I

used

I •

Tool no.

CK-0524

I (1

00ccl

i • Equtvalent oil

may

be

I used.

VI

. MAINTENANCE

BY

CUSTOMER

The

customer should do

the

following

maintenan

ce

to

maximize printer

performance

.

•

I

tem

Customer

mamtenance

Fixing

unit

felt cleaning pad

Replace the clean1ng pad

whenever

the c

artr

idge is replaced.

Fixing

unit

Clean the

fixing

unit

when

the

cartndge

is replaced.

Transfer corona

unit

Clean the

transfer

corona

unit

when

the cartridge is replaced .

Primary corona unit

Clean the

primary

corona

unit

when

necessary.

Transfer

gu1de

Clean the

transfer

guide

when

necessary .

EP-S

cartndge

Rock the

cartndge

to

redistribute toner. If necessary replace 1t.

Table 5-4

•

•

5-7

•

•

•

CHAPTERS

TROUBLESHOOTING

I.

INTRODUCTION

....

.

.......

.

....

6-1

A.

Initial

Check

.....

.

...

.

....

. . . 6-1

B.

Basic

Procedure

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

II.

EXPLANATION

FOR

SPECIAL

TOOLS

.

.........

.......

6-2

A.

Printer

Driver

/

Laser

Driver

Tester

. . . . . . . . . . . . . . . . 6-2

B.

Laser

Power

Tester

..........

6-4

Ill

.

MEASUREMENT

AND

ADJUSTMENT

...................

6-5

A.

Image

Adjustment

. . . .

.......

6-5

B.

Mechanical

Adjustments

.....

6-5

C.

Electrical

Adjustments

....

.

..

6-6

IV

.

IMAGE

DEFECTS

..

...........

..

6-

10

A.

Examples

of

Image

Defects

. .

6-1 0

B.

How

to

\Jse

the

Troubleshooting

Tables

.....

6-

11

C.

Troubleshooting

Image

Defects

. . . . . . . . . . . . . . . . . . . .

6-1 2

V.

TROUBLESHOOTING
MALFUNCTIONS

...............

6-

22

VI .

PAPER

TRANSPORT

TROUBLESHOOTING

............

6-

28

A.

Print

Paper

Jams

........

.

..

6-

28

B.

Incomplete

Paper

Feed

......

6-

30

VII

.

LOCATION

OF ELECTRICAL

PARTS/

FUNCTION

.........

.

....

6-31

A.

Switches

,

Photointerrupters

.

and

Soleno

i

ds

..............

6-31

B.

Motor

and

Others

......

...

..

6-

32

C.

PC

Boards

.............

.

..

. .

6-33

D.

Connectors

...

.

......

. .

....

6-

34

VIII

.

VARIABLE

RESISTORS, LEOS,

TEST

PINS

,

JUMPERS

,

AND

SWITCHES

ON

PC

BOARDS

......

6-

35

A. DC

Controller

PCB

......

.

...

6-

35

B.

HVT

PCB .

..................

6-36

C.

Driver

and

Sensor

PCB

......

6-37

•

•

•

I.

INTRODU

C

TION

A.

In

itial

Ch

eck

1.

Operating

environment

Check

that

:

•

Line

voltage

does

not

vary

more

than

1 0%

from

the

voltage

shown

on

the

ratmg

plate

.

•

The

pnnter

IS

1nstalled

on

a

solid

. level

sur-

face .

•

Room

t

emperature

is

kept

between

1

ooc

and

32

.5°C,

a

nd

relat1ve

hum

idi

ty

between

20

%

and

80

%.

•

The

pnnter

IS

not

exposed

to

ammoma

gas

.

The

pnnter

1s

not

lo

c

ated

m

a

hot

or

hum1d

area (such as

near

a

water

tap.

or

humidifier).

near

open

flames

.

nor

1n

a

dusty

place.

•

The

pnnter

is

not

exposed

to

direct

sunlight

.

If

it

has

to

be

placed

in a

sunny

place.

the

window

should

be

curtained

.

•

The

room

is

well

ventilated.

2.

Corona

units

Check

that

:

•

The

transfer

corona

unit

is clean and

the

cor-

ona

w1re

undamaged

. (Replace

e1ther

if it

can-

not

be cleaned

or

is

damaged.)

•

The

corona

wtre

spnng

of

the

transfer

corona

untt

ts

not

rusted

.

(If

rusted. replace t

tl

•

The

corona

wtre

of

the

pnmary

corona

unit

is

clean.

3. Pri

nt

paper

Check

that

:

•

Recommended

print

paper

is

bemg

used.

(I

f

the

paper

ts

too

thtck

or

too

thtn

. or

tends

to

curl

,

paper

Jams

or

transfer

problems

may

occur,

or

prints

may

be

blurred

.)

•

Pnnt

paper

IS

not

mo1st.

(

Use

fresh

pnnt

paper

and

check

whether

print

quality

tmproves

.)

4.

Consumables

Check

that

:

•

The

printer

sets

status

1

5

bit

6

to

0

when

there

is an EP-S

cartridge

in

the

printer.

If

the

printer

sets

status

1 5

bit

6

to

1 :

a. Take

out

the

EP-S

cart

r

dge

and

slowly

rock

it

to

distribute

toner

evenly. See Figu re

4-7

in

chapter

4.

b.

If

that

does

not

improve

the

prints.

replace

the

cartr

i

dge

with

a

new

one

.

5.

The

transfer

and

feed

guide

plates

are clean.

(If

they

are

dirty,

clean

them

with

damp

cloth

.!

6.

The

fixing

roller

fe

lt

cleaning

pad

is clean.

(If

it

is

very

dirty,

rep

lace

the

pad

with

a

new

one.)

7.

Others
During

wmter

,

if

the

printer

is

taken

from

a

cold

room

(such as a

warehouse)

into

a

warm

room

.

condensation

w1ll

occur

i

nside

the

pnnter.

causing

vanous

problems

.

For

example

:

•

Condensation

on

optical

surface

(such as

the

scannmg

mtrror,

lenses.

and

mirror)

will

cause

the

print

i

mage

to

be

light

.

•

If

the

photosensitive

drum

is

cold,

the

elect

r

i-

cal r

esistivity

of

the

dr

um

will

be

high.

maki

ng

it

impossible

to

obtain

correct

contrast

in

pnnts

.

•

Condensation

on

the

corona

un1ts wtll

cause

corona

leakage.

•

Condensation

on

the

p1ck-up gu1de

and feed

guide

plates

wi

ll

cause

paper

feed

troub

les

If

condensatton

occurs

.

sw

i

tc

h the

pnnter

ON and leave 1t

unused

for

10

to

20

mtnutes

.

If

an EP-S c

artr

i

dge

is unsealed

soon

after

tt

ts

taken

from

a c

old

room

to

a

warm

room

.

con-

densatiOn

w1ll

also

occur

i

ns

i

de

the

cartndge

.

this

can cause t

mage

defects

.

Be

sure

to

mstruct

the

customer

to

allow

t

he

c

artndge

to

come

to ro

om

temperature

before

unsealing

it.

This

w1ll

take one

to

two

hours

.

B. B

asic

Pro

cedure

If

an

image

defect

or

malfunction

occurs

.

make

the

initial

check.

then

follow

the

bas1c

procedure

below

.

1.

If

the

prmter

malfunct

ions. read

section

V

for

tr

oubleshooting

.

2.

If

an

image

defect

occurs,

determine

the

type

of

image

defect

using

the

list

of

image

defect

samples

shown

on

page

6-1

0.

and

correct

the

defect

.

6- 1

•

•

•

II.

EXPLANATION

FOR

SPECIAL

TOOLS

A. P

ri

nter

Dr

iver/

Laser

Dr

ive

r

Tester

CD

J21

o

®

J202

Figure

6-1

Th e

pnnter

dr

i

ver

laser

dnver

tester

allows

the

pnnter

to

be

ope

rated

Without

bemg

con

-

nected

to

an

mterface.

1n

order

to

test

whether

1t

IS

operatmg

normally

.

.

The

tester

has

the

following

three

functtons

:

1)

Causes

the

printer

to

print

vertical

and

ho

riz

ontal

lines.

or

a

white

image

(prin

te

r

driver

teste

r).

If

the

print

is

not

nor

ma

l.

de-

te

rm

ine

whether

the

trouble

is caused

by

the

printer

or

by

the

external

device

.

2) Forces

the

laser in

the

printer

to

operate

(laser

dnver

tester). Measure laser

powe

r

with

a

laser

powe

r

tester

(explained later)

and

conf

irm

that

the

powe

r is

within

the

sti

pu

lated range.

3) Stmulates

the

laser

driver

circuit

(laser

driver

tester).

Disconnect

the

laser

from

the

DC

cont

roller

PCB

and

connect

the

LED

of

the

tester in

its

place.

This

sim

ulat

ion

allows

de-

ter

mtning

whether

the

problem

is

due

to

the

laser

diode

or

the

las

er

driver

ci

r

cuit

of

the

DC

cont

r

oller

PC

B.

6-2

•

Description

of

the

control

panel

-

":e

-

-

.·.

r._:

c&

''

"

"0

--

·•

l'""""'\

r

·-

···

'

.

~

'

~

Figure

6-2

Control

panel

of

the

printer

dr

iv

er

/l

aser

driver

tester

TEST PRINT

Causes

the

pnnter

to

pnnt

a

pattern

spect-

fie

d

by

VIDEO SELECT

VIDEO SELECT

Selects

a

test

pattern

to

be

printed

: vertical

lines.

hori

z

ontal

lines

or a

white

image

.

LASER POWER CHECK

•

When

connector

J202

of

the

tester

1s

not

co

nnected

to

J202

of

the

DC

controller

PCB:

Th

e

laser is

forced

to

operate at

the

HIGH

setting

of

LASER POWER SELECT.

•

When

connector

J202

of

the

tester

1s

conn

ected

to

J202

of

the

DC

controller
PCB:
The

LED

of

the tester is

lit

with

the

inten-

si

ty

specified

by

LASER POWER

SE

LECT.

READY

CONTROL

INH

forces

the

printer

into

the READY

condi-

tion

regardless

of

whether

a cassette is

pre-

sent

.

LASER POWER SELECT

Specifies

the

light

output

of

the LED

of

the

tester

to

HIGH. MED.

or

LOW

.

LASER CURRENT

The

light

output

of

the

LED

of

the

tester

IS

monitored

by

a

photodio

ce.

Setttng

the

sw

i

tch

to

"STD"

fee

ds

the

output

of

the

photodiode

(l.ED

light

output

monitor

signal)

to

the

LED drive

circuit,

but

at

the

MAX

set-

ting

there

is no

feedback

.

Therefore.

~he

maximum

drive

cur

rent

that

can be

supplied

by

the

laser

driver

passes

through

the

LED

.

+!-

Terminals

for

measuring

the

flo

w

of

current

in

the

LED .

•

•

•

CART. SIM.

SW

CASS

.

W i

thout

the

use

of

actual

EP-S

cartridge.

this

sw1tch

simulates

the

presence

or

ab-

sence

of

the

cartridge.

Using this

switch

does

not

affect

any

func-

tion

of

the

LBP-UX

.

PRINT

CART

Simulates

cartridge

in

position

Using

this

switch

does

not

affect

any

func-

tion

of

the

LBP-UX.

NO

CART

Simulates

no

cartridge

in

posi-

tion

• L1st

of

signals

Connector

1

Signal

I

Function

contact

no. !

na

me

J202-

T

I

DSADJ

Analog

signal mdicating sensitivity

of

the

photodiode

.

J202-2

I

PO

Analog

signal

indicating

output

from

the laser

diode

.

J202-3

LDAV For

switching

laser

ON

and

OFF

.

J202-4

+ SV

I

J202-5

FG

J21

0-1

+

24VA

I

J21

0-2

NC

J21

0-3

NC

J21

0-4

DBDC

L

to

apply

DC

developing bias.

J21

0-5

1

- sv

J21

0-6

DBAC

L

to

apply

AC

developing bias.

J2, 0-7

GND

J21

0-8

HV10

N L

to

apply

DC

high

voltage to primary corona.

J210-9

+sv

J210-10

HVTON L

to

apply

DC

high

voltage to transfer corona.

J210-11

-r3.2V

J210-12

TP

A Specifies

type

of

test pattern to be

printed

fSTi5T

1 (

combmation

of

TPB and TSTPTE) .

J210-13

i Goes L

when

the TEST PAINT

button

is pressed .

J210-14

TPB

1

See

the

description

of

TPA

.

J210-15 • ROY

INH

I L

to

force

prmter

to

print

even

when

it

is

not

ready.

J210-16

, TSTPTE • See

the

description

of

i'PA.

J210-17

LPCHK I Spec1fies laser

power

(combi~a

tion

of

CSENS 1 and CSENS2).

J210-18

CSNT1

Specifies laser

power

in combination with

CSNT2

.

J210-19

I SCNON

L

to

operate

the

scanner

motor

.

J210-20

I CS

NT2

See

description

for

CSNT 1 .

Table 6-1

6-3

•

•

•

B. L

ase

r P

owe

r T

este

r

Fi

gu

re

6-

3

The

laser

powe

r

tester

is used

with

a

digital

multimeter

to

measure

laser

power

. Use

the

tester

as

shown

below

.

• I - ,

Fi

gure

6-4

6-4

•

•

•

Ill. MEASUREMENT

AND

ADJUSTMENT

A.

Image Adjustment

If

an

image

problem

occurs.

follow

the pro-

cedu

re

below

to

make a

test

print.

1)

Remove

the front

bottom

cover

. (2)

2)

Switch

the

power

ON

by

a signal

from

the

external device.

3)

Wait

for

the

printer

to

make

the

ROY signal

TRUE.

4) Press the TEST PRINT

button

on

the

DC

controller

PCB. This

makes

one

test

print

as

shown

in

the

figure

below

.

; .

.

•I,

..

·,

,

Figure 6

-5

5)

Determine

the type

of

the image problem

from

the

test

print a

nd

go

to Section IV.

B. M

ec

han

ical Adjustments

1.

Check

ing

the

nip

width

of

the

fixing rollers

The

fixing

unit

is

not

designed

to

allow

ad-

justment

of

the

pressure (

and

nip

width

).

If

the

nip

width

is

not

correct. a fixing

problem

may

occur.

Follow

the

procedure

below

to

check

the

nip

width

.

1)

Either

take

along

one

or

two

all-black

A4

i

Letter-size

copies

made

with a copier, or

make

such a

black

copy

using a cop

ier

at

the

customer

site.

2) Remove

the

front

bottom

cover

. (2)

3) P

ut

the

black

print

on

the

manual feed

tray

.

4) Press

the

TEST

PRI

NT

button

on

the

DC

controller PC

B.

5)

When

the

end

of

the

print

first

emerges

at

the

delivery tray,

switch

the

printer

OFF

by

a si

gnal

from

the

external

device.

and wa

it

for

abo

ut 1 0 seconds, then

switch

the

printe

r ON agai n.

6)

Measure

the width

of

the

glossy

band

across

the print

and

check

that

it

meets the

requirements

shown

in table

6-2

.

Feed-out

dorect1on

b

Ia-

c I

I

a-

b I

l

b-

c l

- c

I

Center

of

A4

/Letter

all·

b

lack

copy

-·

--

a

F

igu

re 6-6

Measurement

2

to

3.5

mm

0.5

mm

or

l

ess

0.5

mm

or

less

0.5

mm

or

l

ess

Table

6-2

6- 5

•

•

•

C.

Ele

ct

r

ical

Adjustments

There are

no

VAs

that

require

adjustment

1n

the

field .

However.

smce

the

laser

beam

used is

invisi-

ble,

a

problem

wtth

laser

output

cannot

be

iden-

tifi

ed

visually

.

The

laser

malfunction

diagnosis

flowchart

on

the

next

page

should

be

followed

to

determme

whether

the

fault

lies

wi

th

the

lase

rtscann

er

umt

or

the

DC

controller

PCB.

Spectal

attention

should

be

given

to

the

fol-

lo

wtng •t

ems

during

troubleshooting

.

• Plug

the

(

+)

lead i

nto

the

red

socket

and

the

(-)

le

ad

i

nto

the

black

socket

of

the

multi

meter

.

•

The

laser

element

can be

destroyed

by

ex-

cessiv

e

current

.

.d

sure

to

switch

the

printer

OFF

before

disconnecting

a

connecto

r.

•

The

voltage

should

be

measured

three

times

and

the

average used .

6-6

•

•

•

Printer

dnver

/laser

dnver

tester

J210

J202

Coo"'"·~:.~:·:~

_

~C

::::~

"

"

PCB

I

connected

Connector

15 pohs)

Figure

6-8

Pri

nter

drover/

laser

drover

tester

J210

J20

2

Connec

tor

120

pons)

DC

controller

PCB

U

TP208

-----,

J202

-

----

J,J210

T8~01

Conn

ector

(5

pons)

I..

--

-

"'C:]

~

1

--+--.J

Oi

gotal

multo

meter

COMV

·n

~

9

I

Figure

6-9

Pri

nter

dnver

/laser

drover

tester

DC

controller

PCB

J210

J202

0 0

Connector

120

pons)

------QJ210

---------,

Connector

(5

pons)

6

J202

Digital
multo

meter

COMv.n

Q

0

I

Figure

6-

10

6- 9

•

•

•

IV

.

IMAGE

DEFECTS

A . E

xa

mple

s

of

Image

Defects

1-1

L1ght

..

. .

••

..

•

.

.

"•

..

.

0

..

••

.

..

..

...

•

••

...

•

.

"

.

••

..

·.

.

.

.·.·

.·

.·

,

-·.·

.·

.

.

··

::

:

·.

·

.·

.·

,{

:

:::·

:

.

. .

.

'

• •

••

'.

0 •

1-

2

Dark

1-3

Completely blank

1-

4

All

black

L

LP

1-5

Large

dots

m lme

vert1cally

1

-6

D1rt

on

back

of

pap

er

1-7

Vert

ical bl

ack

streaks

1-8

Thm

black

honzontal

1-9

Irregular

and

1-1

0

Irregular

and

1-11

Blank

spots

smud

ged

vertical bands

smudged

hor

i

zontal

bands

lP

streaks

1-12

Solid vertical
whit

e line(

s)

1-

1

3 Faulty regiStration

1-1

4

Poor

fixmg

1-

1

5

DistortiOn

1-1

S

Mis

sing

edge

or

bottom

edge

LP

LP

(enlarged)

(reduced)

1-

1

7

Incorrect

resolution

Figure 6-11

6-10

•

•

•

B.

How

to Use the Troubleshooting Tables

The

troubleshooting

tables in Section IV

to

VI give information

for

troubleshooting if image

prob-

lems,

malfunctions.

or

paper

transport

problems

occur

.

This sect1on describes

how

to

use the troubleshooting tables .

Example: AC

power

failure

Posstble cause

Power

cord

Upper

untt

Circuit

breaker

Line

voltage

Door swi

tch

2

3

4

5

Check

I

Is

the print

er

plugged

in?

!

Is

the

upper

unit

closed?

Is

the

circuit

breaker ON?

, Is

normal

line

voltage

being supplied

to

the printer?

Insert a

screwd

river

into

the

door

switch

hole. Does

the

printer

go

ON?

Table

7-3

! Result 1 Measure

--

-----1

NO Plug tt tn.
NO

I NO

NO

YES

1

Close tt.

' Reset tt.

j

Nottfy

the

customer

that

this

is

not a printer

problem

.

-

--------1

1 Check

the

door swi

tch

.

1

Replace

it if it

is

faulty

.

____

___J

The above tables

show

that

the cause

of

the problem

"AC

power

failure"

could be

the

power

cord.

upper

unit

position

. circuit breaker. line voltage,

or

door

switch.

To solve a

problem. start

at

step 1 and

do the

check indicated in the

"Check"

column

. If the check

result is indicated in the

"Result"

column, take the measure indicated in the

"Measure"

column.

If

the check result is

not

as

mdicated.

go

to

the next step and

do

the

same

as

for

step 1. The above

table can be

written

in a

flowchart format

as

shown

below

.

S

tep

Check

Result

Measure

NO

!

Plug

ot

on

I

!

YES

NO

l

2

Clo

se

ot

NO

Turn

ot on.

3

Figure

6-12

6-11

•

•

•

C.

Tr

o

ubl

eshooting

Image

Defe

cts

1- 1

Light

Poss1ble Cause

I

Step

Check

1

Op

en

the

pnnter

while

a

print

IS

I

,

being

made

.

Is

the

toner

emag

e

on

the

drum

being transferred to the

paper?

I

Do

not

open

the

drum

protective

I

I

shield

for

more

than 1

0

seconds.

Transfer corona

I

2

Is

the corona

wire

broken?

I

unit

!

Print

paper

I

3

Does

print

quality

i

mprove

when

I

I

fresh

print

paper

is used?

Transfer corona

4

Do

es

the

voltage

between

J702-1

HVT

'

I

(

HVTON

) and

J702-7

(GNDl dr

op

from

about

+

20VDC

to

OV

t

wo

I

I

. seconds

after

the

ma

in

motor

I

I

starts?

I

I

I

'

I

DC

con

troller

PCB

5

Two

seconds

after

the

ma1n

motor

starts

does

the voltage between

J211-8

IHVTONl

and

J21

1-2

(GND)

drop

from

about

+

20VDC

to

I

OV?

I
I

Developmg

bias

I

6

One

second

afte

r

the

mam

motor

I

starts does the voltage

between

J702-6

(~)and

J702-7

(GND)

drop

from+

16VDC

to

OV?

Three seconds

after

the main

motor

starts

does

th

e voltage between

J70

2

-4

(

~

)an

d

J702-7

(GNDl

drop

fr

om

about+

16V

DC

to

OV?

DC

controller

PCB

7

On

e second

after

the ma in

motor

starts

does

the voltage

between

J2

1 1

-3

(

~

and

J2

1 1

-2

(GNDl

drop

from

about

+

16V

DC

to

OV?

Three seconds

after

the

ma

1n

motor

starts

does

the voltage between

I

J2

1

1-5

(

t)SAC

)

and

J211-2

IGND)

dro

p

from

about

+

16VOC

to

OV

?

6-12

Result

I

I

Measure

YES

If

the toner

e

mage

IS

very faent.

go

I

I

to step 6.

'

I

I

I

I

l

I

I

YES

1

Replace the corona

w1re.

I

I

(See page 3-1 5)

I

YES

, Replace the

pr

ent

paper.

I

!

I

Advise the

customer

how

to store

pnnt

paper

.

YES

Check

the

wer

ing

from

connector

J702

to

J701.

whether

I

j

co

nnector

J70

1 is

making

good

contact.

and

the

contact

between

I

the

hegh-voltage

connector

and

the

transfer

corona unit.

If

so

'

good. replace the

htgh-voltage

I

powe

r supply.

NO

Check

whether

connector

J211

I

is

mak

i

ng

good

contact

.

1

(Disconnect

the

connector

. clean

the

contacts.

r

econnect

1t

and

I

I

wi

ggle

it.l

If

so. replace the

DC

controller

PCB.

I

YES

i

Check

the

wiring

from

connector

I

I

I

J_702

to

J701

.

whethe

r

con

nector

J

701

is making

good

I

contact.

and

whether

the

hegh-

voltage

connecto

r is

mak

i

ng

good

I

contac

t with the developi

ng

bias

contact

.

If

so

. replace the hi

gh-

1

voltage

power

supply.

NO

I

Check

whether

connector

J2

1 1

I

IS

makeng

good

contact.

I

(Disconnect the

connector

. clean

the

contacts,

reconnect

it

and

wiggle

et

.)

If

so. replace

the

DC

cont

ro

ll

er

PCB.

Poss•ble

Cause

I

Step

Check Result

I

Measure

Drum

sens1t1v1ty

8

Wh

en

drum

sensit1v1ty

Iden

ti

fication

NO

Replace

the

faulty

sw1tch

•denhf1cat1on

switch

SW301

is pressed

does

the

(S

W30

1

or

SW302l.

sw•tches

(S

W30

1.

voltage

betw

een

J301-1

(CSENS

1)

•

SW302)

and

J30

1

-6

(GND)

drop

from

about

+

5VDC

to

OV?

.

When

drum

sensit

ivity

I

dent

ific

at

ion

I

I

switch

SW302

is pressed

does

the

voltag

e

between

J30

1

-2

(CSENS2l

I

and

J30

1

-6

(

GND

I

drop

from

about

+svoc

to

ov?

Laser

and

scanner

9

I

Measure

the

voltage

on

TP20

8

YES

Replace

the

laser and

scanner

un1t

using

the

laser

mulfunction

un1t.

DC

con

troller PCB

di

agnos

is

flowchart

in

Section

Ill.

C

NO

Replace

the

DC

controller

PCB

of

this

chapte

r.

Is

th

e

voltage

nor

mal?

•

•

6-13

1-2

Dar

k

•

~ . . . . . ' .

·

-: :1::-:

p···

.:::

(

~

~

..

:

)

!:~

Poss1ble Cause

Step

Check

I Result Measure

Drum

sens1t1vity 1

When

drum

sensitivity

identification

NO

Replace

the

faulty

switch

1dent1fication

1

switch

SW30

1 is pressed

does

the

ISW30 1 or

SW302l

.

sw1tches

ISW

30

1.

i

1

voltage

between

J30

1-1

(CS

ENS

1)

SW302)

1

and

J301

-6

(GN

D)

drop

from

about

+ SVDC

to

OV?

When

drum

sensitivity

identification

I

I

switch

SW302

is pressed

does

the

I

I

voltage

between

J301

-2

(CS

ENS2

l

i

I and J

30 1 -6

(GND)

drop

from

about

+5VDC

toOV?

High-voltage

I

2 I Clean

the

contact

between

the

high-

YES

Make

sure

that

the

ground1ng

connector

j

voltage

connector

grounding

spring

spring

is

making

good

contact

I 1 and

the

EP-S cartridge. then

make

a

1

w;th

the

EP

~S

ca,.ndge.

I

i

test

pnnt.

Does

print

quality

'

l

1

1mprove]

Laser and scanner

I

3

I

Measure

the

voltage

on

TP208

YES

I Replace

the

laser and scanner

unit

I

using

the

laser

mulfunction

untt

.

DC

cont

roller PCB

I diagnos1s

flowchart. Is

the

voltage

NO

Replace

the

DC

controller

PCB.

on

TP208

normal?

•

•

6-14

1

-3

Completely

blank

•

Poss1ble Cause

1

Step

I

Check Result

Measure

EP-S

cartndge

1

1

Has the

seal

been removed

from

the

I

NO

1

Unseal

it.

cartridge?

I

I

2

1

Ca

n

the

protective

sh1eld

be opened

I

NO

I

Repair

the

cartridge.

and

closed

smoothly

7

I

1

If

imposs1ble. replace it.

3

Is

the

laser

beam-blockmg

shutter

!

Y

ES

Replace th e

cartndg

e.

damaged?

Transfer

corona 4

Is

there

any

conductive

foreign

I

YES

Clean the

w1re

.

un1t

matter

between

the

corona

wire

and

fra

me

?

'

I

Deve

loping

b1as

5

One

second

after

the

mam

motor

Y

ES

1

Check

the

w

1nng

fr

om

connector

starts

does

the voltage

between

J

702

to

J701.

wh

ether

J70

2

-6

(

~

)and

J70

2

-7

IGND)

conn

ec

tor

J70

1

IS

makmg

good

drop

from

about

+ 1 6VDC to

OV?

I

1

contact.

and

whether

the h1

gh-

Three seconds

after

the matn

motor

I

voltage

connector

is

making

good

st

arts

does

the voltage

between

I

1

contact

with

the developing

b1as

J70

2-4

(DBAC) and

J702-7

IGND)

I

conta

ct

.

If

so. replace the hi

gh

-

drop

from

about

+

16VDC

to

OV?

1

voltage

power

supply.

•

DC

controller

PCB

6

One

second

after

the

mam

motor

NO

'

Check

whether

conn

ector

J211

I

sta

rts

does

the

voltage

between

I

is

mak

i

ng

cood

contact.

J2

1 1

-3

(

0Bi5C)

and

J211

-2

IGND)

(

Disconnect

the

connector

. clean

I

drop

from

about

+

16VDC

to

OV?

I

. the

co

nt

acts. reconnect

1t

and

Three

seconds

after

the main

motor

I

i

wiggle

it.)

If

so. replace the

DC

starts

does

the

voltage

between

con

troller

PCB.

J

211

-5

I

DBAC

l

and

J211-2

(GND)

'

'

drop

from

about

+ 1

6VDC

to

OV?

I

Laser

and

scanner 7

1

Measure

the

vo

ltage

on

TP208

I

Y

ES

1

Replace

the

laser

and scanner

un

it

'

usmg the laser

mulfunct

i

on

I

unit.

I

DC

controller

PCB

I

diagnosis

flowchart

.

Is

the voltage

!

NO

I

Replace the DC controller PCB

:

I

on

TP20

8 normal?

•

6-15

•

•

•

1·4

All

black

Possible Cause

Primary

corona

unit

High-voltage
power

sup

ply

DC

controller

PCB

Step

Check

1 1 Is

the

corona

wire

broken?

2 One

second

after

the

main

motor

I

starts

does

the

voltage

between

I

J702-3

(HV10NlandJ70

2-7

· (GNDl

drop

from

about

+ 1

6VDC

to

OV?

1· 5

large

dots

(in

line vert

ically)

.

.

••

. .

•

..

.

...

.

·~

·

••

.....

••

'"'"

..

...

.

.. ..

..

•

..

"

.

~

.. _

0

...

...

.

.

-~

.

Possible Cause

Stat1c

charge

eilm1nator

High-voltage
power

supply

6-16

Step

Check

1 Clean

the

contact

between

the

high·

voltage

connector

and the

static

charge

elimanator. then

make a test

print.

Is

the

print

normal?

Result

I

Measure

YES 1 Replace

the

cartridge

.

YES

1

Check

the

wiring

from

connector

1

J702

to J 701.

whether

1

connector

J701

is

making

good

contact.

and

whether

the

h•gh·

I

voltage

connector

is

making

good

I . h h ·

I

contact

w1t t e

pnmary

corona

unit.

If

so. replace

the

h1gh-

:

voltage

power

supply

.

NO I Check

whether

connector

J211

1 is

making

good

contact.

If

so.

1

replace

the

DC

controller

PCB.

Result

Measure

YES

Make

sure

that

the

high-voltage

connector

has

good

contact wit

h

the

static

charge

eliminator

.

NO Replace the

high-voltage

power

supply.

•

•

•

•

1-

6

Dirt

on

ba

ck

of

pa

per

Posstble

Cause

Cassette

co

ver

Transfer

gu

•de

un1t

Transfer

co

rona

un

1t

Feed

gu•de

umt

Fixmg roller

felt

cleanm

g pad

.

Step

I

1

I

2

I

I

I

I

3

I

I

4

!

I

I
I

1

-7

Verti

ca

I

black

st

r

ea

k s

L

Posstble

Cause

Pnmary

cor

ona

un•t

Photosens1
drum

tive

F1xmg

roller

felt

cleamn

g

pad

Step

1

I
I

I
!

2

I

I

Check

Result

I

Measure

Is

the

cover

ot

the

cassette

dirty

7

YES

Clean

it

w1th a

damp

cloth.

then

I

w•pe

1t

w1th a

dry

cloth

.

1

Is

the

transfer

gUide

d•rtY

7

I

YES

Clean

1t

w1th a

damp

cloth.

then

I

w1pe

1t

w1th

a

dry

cloth

.

1

Is

the

transfer

corona

umt

d1rty

7

YES

Clean

1t

w•th

a

damp

cloth,

then

I

I

wipe

it

w1th a

dry

cloth

.

Is

the

feed

gu•de

dirty)

YES Clean

1t

with

a

damp

cloth.

then

wipe

•t

w

ith

a

dry

cloth.

NO

Replace

the

felt

cleaning pad.

.

Check

Result Measure

Clean

the

pnmary

corona

umt

and

YES

Clean

the

pnmary

corona

un1t.

make

a

test

print

.

Is

the

pnnt

I

no

r

ma

l?

Open

the

pnnte

r w hile a

p

nnt

IS

YES Replace

the

cartndge

.

being

made

.

Open

the pr

otective

shield

of

the

catndg

e. Can

verttcal

streaks

be seen

on

the

drum

7

NO

I

Replace

the

felt

cleaning

pad

.

6-17

•

•

•

1-8

Thin

bla

ck

hor

izo

ntal

st

r

eaks

LP

Possrble

Cause

!

Step

Check

Photosensrtrve

I

1

i

Do

the

st

reaks

occur

at

regular

drum

I

rntervals?

Laser and scanner
umt

I
I

DC

controlle

r

PCB

I

1-9

Irregular

and

smudged

vertical

bands

'!

~

L}P

..

...

Possrble

Cause

Prrmary

corona

unrt

Photosensrtrve

drum

Step

Check

1

Clean

the

corona

wire wrth

a wrre

cleaner

and

make

a

test

prrnt.

Is

the

prrnt

normal

7

I

1-

10

Irregular

and

smudged

horizontal

bands

Possrble

Cause

Step

Check

Photosensrtive

1

Do

the

bands

appear

at

regular

drum

in

tervals

7

Fixing roller

felt

cleaning pad

6-18

Result

I

Measure

YES

I

Replace

the

cartrrdge.

I

NO

1

Replace

the

laser

and scanner

I

unrt

I

l

lf

there are

strll

problems

. replace

the

DC

controller

PCB.

Result

Measure

YES

Clean

the

primary

corona

unrt.

NO

Replace

the

cartrrdge.

Result Measure

YES Replace

the

cartridge.

NO

Replace

the

felt

cleaning pad.

•

•

•

1-

11

Blank

spots

Poss1ble Cause

Pnnt

paper

Developi

ng

b1as

Step

Check

Has

the

pnnt

paper

absorbed

mo1sture?

1-12

Solid

vertical

white

line(s)

Possible Cause

Step

Ch

eck

Lack

of

toner

: Is there one

or more straight ve

rtic

al

i

wh

ite

streak

of

unifo

rm

width?

Mi

rror

2

l is the m1rror

dirty?

I

Transfer

corona

unit

Result Measure

YES

Replace the paper.

NO

Result

YES

Y

ES

NO

wrap

and

Advise

the

customer

to

sto

re

print

paper

to

pre

from

absorbing

moistu

vent

1t

re

.

Check

that

the develop

~ng

b1as

•s

normal.

Measure

Take

out

the

cart

ridge

shown

in Section Ill

of

I to

distribute

the

toner

I then reins tall it.

I

, rock

1t

as

Chapter 4

evenly,

a

blower

1 Clean

the

mirror

using

brush

. The

mirror

can

be

scratch

thod

of

1

easily,

so

any

oth

er

me

1

cleaning requires grea

t care.

l Clean the

transfer cor

ona unit.

6-19

1-

13

Fau

lty

registration

•

'

i Result

Possible Cause

Step

Check

Measure

Cassette

1

Is

the cassette overloaded?

I

I

YES

1 Instruct the

customer

not

to

load

I

· the cassette with

too

much

I

I

I

:

paper

.

Pi

ck-up

roller

I

2 :

Is

the p1ck-up roller

worn

7

YES I Replace

it.

Pri

nt

paper

3

Is

paper

recommended

being used? ' NO j

Make

a test

pnnt

w1th

I

I

recommended

paper

. If the

I

I

i

1

problem

disappears.

adv

ise the

'

customer

to

use recommended

'

I

paper.

Regi

stration

roller

4

Is

the

clutch

spnng

deformed.

YES

i Replace t

he

sprmg.

c

lutch

rusted.

or

worn?

I

I

I

Dr

iver and sensor 5

Three seconds

after

the main

motor

Y

ES

Replace the dri

ver

and sensor

PCB starts

does

the

voltage

between

I

1 PCB.

DC

controller

PCB

J301

-3

(REGDl and

J301-6

(GND)

NO

1

Replace the DC controller PCB.

I

change

from

OV

to

between

3 and 5

VDC ?

• 1-14 Poor

fixing

Possible Cause

I

Step

Check

Result Measure

Fixi

ng

roller heater 1

Make

1 0 test pnnts.

Is

the last

1m

age

YES

Replace t

he

thermi

stor

(TH 1

).

li

ghter

than

the

first

?

Fi

x1ng

rollers 2

Does

poor

fixing

occur

in a vertical

YES

Check

whether the fix1ng

rollers

band?

are

damaged

.

Fixing u

mt

3

Is the nip w1dth

correct

?

YES

Replace t

he

fixi

ng

unit.

Pri

nt

paper

NO

Pri

nt

using Canon-recomended

paper.

If

the

problem disappears.

advise

the

customer

to

use

recommended

paper

.

•

6-20

•

•

•

1-

15 Distortion

lP

Possible Cause

Laser and scanner
unit

DC

controller

PCB

Step

Check

· Does LED20 1 on the

DC

controller

' PCB

go

ON

after

the scanner

moto

r

1 starts?

I Result

I Measure

--------------------------~

1

YES

; Replace the laser and scanner
' unit .

I

~---

~~----------------------~

NO 1 Replace the

DC

controller

PCB.

~------------------------------------------------~~----

1-16

Missing

edge

or

bottom

edge

Possible Cause

Check Result Measure

Is

the paper-size

identification

slider i NO

Set

it

correctly

.

to

the

correct

position?

1-

17

Incorrect

resolution

LP

LP

(enlarged)

(reduced)

Possible Cause

Step

Check

Result Measure

DC

controller

PCB

1

Set pri

nter

resolution to

400DPI

by

a

YES

I Replace the DC

controller

PCB.

Interface PCB

sig

nal from

the

external

device

.

Make

one

text

print.

Is

the volta

ge

NO

Replace the

interface

PCB.

between

connector

J205A-9

(DPII

and

J205A-

1 (GNO)

about

5VDC

while a print

is being made?

6-21

•

•

•

V.

TROUBLESHOOTING

MALFUNCT

I

ONS

When

performmg

any

of

the

corrective

act1ons

descnbed

below

.

the

followmg

precaut1on

should

be

taken

when

measuring

voltages

at

des1gnated

connector

pins

.

first

check

the

connector

for

faulty

con-

tacts

.

If

no

oth

er

wise

noted

.

measu

r

ements

of

voltages

on

pi

ns

of

connectors

are

to

be

made

w

it

h

the

con-

necto

r

connected.

M -1

No

AC

Power

Poss1ble Cause

Step

I

Check j

Result

Measure

AC

hnes

1

•

Is

the correct

vo

lt

age present at the

I

NO

Info

rm

the user

that

there

IS

a

outlet?

problem

w1th

the

AC

power

lin

es

.

Power plug 2

Is

the

power

cord firmly plugged

1nto

I

1

the outlet?

I

NO

Push the

power

plug

m

firmly

.

Circu1t

breaker 3

l

is

the

Circuit breaker

OFF

?

I

YES

Reset the

CirCUit

breaker.

If

it tnps

ICB101)

I

again. check

for

a short circu1t.

I

Low-voltage

power

'

4

I

Unplug

connector

J60

1

from

the

I

YES

I

Replace the low-voltage

power

supply

low-voltage

power

supply.

Is the

I

supply.

AC

controller untt

,

co

rrect

voltage present between

I

NO

j

Replace the

AC

controller

un1t.

p1ns

1 and 3

of

J602?

M -2 No DC

Power

Poss1ble

Ca

use

Step

Check

Res

ult

Measure

Connector

1

i

Is

connector

J60

1 connected

NO Connect

it

correctly.

I

1

cor

rectly?

AC controller un

1t

2

·

Unplug

connector

J60

1

from

the

.

NO Replace the

AC

cont

roller

un1t.

lo

w-voltage

power

supply.

I

I

Is

the

spec

ifi

ed voltage (AC

line

j

I

voltage) present between

J60

1 -1

I

J

andJ602-3?

'

Misoperat1on

3

;

Is

th

e voltage selector set

to

the

I

NO

1

Set

it

correctly.

I

I

co

rr

ect

voltage?

I

Fuse

I

4

I

Is

the

fuse

blown

in

the

low

-voltage

I

YES

I

Replace

the

fuse.

I

pow

er

supply?

External device

5

' Swit

ch

the

power

ON. Is the voltage

j

YES

i

Replace

the

lo

w-voltage

power

betw

een

J205-

89 IPCONT)

and

I

supply.

J205-A

1

IGNDl about

SVOC?

NO

I

This is

not

a pnnter problem.

Check

the

external device .

6-22

•

•

•

M -3

The

printer

sets

the

6th

bit

of

Status

15

to

" 1"

even

when

there

is

Enough

Toner

in

the

EP

·S

Cartridge

Poss1ble Cause

Step

I

Check

I

Result

1

Measure

EP-S

cartridge

I

,

!

Is

there

a cartridge

tn

the

pnnter

? NO , Install

a c

artndge

.

I

2

1

Does

the

cartridge have a dr

um

NO

j

Replace the cartndge.

I

-

' sensitivity indication cam?

I

3

' Remove the

cartr

i

dge

. rock

it

m

the

NO

' The

toner

supply

IS

getting

low.

I

I

co

rrect

manner. then

re1nstall

it.

i

so a

new

cartridge should be

I

Does

the

pr

i

nter

set

status 1 5

bit

6

I

obtamed

for

use

when

needed.

toO?

Actuator

4

1

When

the

pr

i

nter

•s

closed.

1s

one

or

NO

Replace

the

actuator

.

both

drum

sensi

tiv

ity

t

dentl

ficatton

: s

witches

(

SW30

1 and

SW302)

I

1

actuated

?

High-

vo

ltage

5

Are

the

conn

ector

pms

of

the

h1gh- Y

ES

I

Clean

the

high-v

oltage

connector

.

connecto

r

I

I

voltage cable

for

developing bias

I

.

and

the

toner

sensor

dirty?

I

Gfld

of

prrmarv

Oe

ve

lo

p

ong

b1

as

P

ro

marv

coron

a

un1t

I

Toner

se

nsor

corona

I

G

NO

\

__

t

!

~

m

--

-

-=r--

---

I

F-

-

~-

"

:=j

.

•

-~

-:g

I

-

-~

-.

-----=-

.-

,

I

I I

I

Sta

toc

charge

Tra

nsfer

coron

a

I

et

om

1n

ator

I

Driver and sensor

6

1

When

the

drum

sensitivity

NO

I

Replace

the

driver

and

sensor

PCB

1

i

dentification

switches

listed

below

PCB.

I

: are pressed.

does

the

voltage

at

the

I

I

i

ndicated

pins

of

connector

J2

1 3 on

I

th

e DC

controller

PCB

go

from

about

DC

controll

er

PCB

5VDC

to

OV?

YES

1

Replace the DC

cont

ro

ll

er

PCB.

I

I

I

I

SW301

J

2,

3

-,

I

SW302

I

J2,

3-2

High-

voltage

I

7

I

Measure

the

voltage

between

Y

ES

Replace the hi

gh

-voltage

power

power

supply

.

co

nnector

J702-5

(TSENSI

and

S!Jpply.

DC

controller

PCB

j

J702-7

(

GNDl.ls

the voltage

about

NO

I

Replace the DC

cont

ro

ller PCB.

,

24VDC

or

OV?

6-23

•

•

•

M -4

The

prin

te

r

se

ts

the

4th

bit

of

Status

1

to

" 1"

even

when

a

Cassette

Loaded

with

Paper

is

Installed

Poss1ble

Cause

Step

Check

!

Result

!

Measure

Dnver

and

sensor 1

:

When

there

1s

a cassette with paper

I

NO

I

Replace the

dnver

and sensor

PCB

1n

the

ho

l

der

. is t

he

voltage

betwee

n

PCB.

I

.

c

onnector

J30

1

-8

(PEMP)

and

J301-6

(GND)

about

SV

DC

?

Cass

ette

s1

ze

2 Press the cassette si

ze

se n

s~ng

NO

Check t

he

wmng

fr

om

the

DC

sensmg sw1tch

PCB

1

swi

tches

in

turn

.

Is

the voltage

co

ntro

ller PCB

to

the

cassette

between the

corresponding

st

ze

se n

sing

sw

1

tch

PCB.

If

the

c

onnector

(

J2

1

7-2

.

J21

7-3.

or

winng

IS

correct. replace

the

I

J217-4

)-:;,

dJ217-1

(

GNDIOV?

casse

tt

e

s1ze sens

1r.q

sw1tch PCB.

DC

controller

PCB

I

I

YES

I

Replace the

DC

controller

PCB.

I

SW261

I

J217

-2

I
I

J217-3

I

SW262

I

I

I

SW263

I

J217-4

M-5

The

printer

sets

the

4th

bit

of

Status

1

to

" 1"

when

a

Cassette

is

out

of

Paper

P

os

s1b

le

Cause

Dr

i

ver

and

se

n

sor

PCB
DC

co

ntro

ll

er

PCB

Step

I

l

Check

1

Result

I

Measure

When

the cassette is

empty

, 1s

the

vol

tage

between

connector

J30

1

-8

1

NO

I

Replace

the

dnver

and sensor

PCB.

IPEMPI

and

J301-6

IGND)

PCB

OV

? -Y"""E

"""

S

--

R

....,

e-p-la_c_e_t_

h_e

_D_C:--co_n_t-ro-1

-le

_

r_P

_C_B-.

--t

M -6

Faulty

Main

Motor

Possible Cause

i

Step

Check

~

Result

I

Measure

1 Have the main

motor

connecto

rs

I

NO 1

Plug

1n

the

connectors

.

(

J501

.

J502.

J2

15

. and

J214)

I

·

been plugged in?

I

Main

motor

(M

1)

2

Is

there

con

t

~nuity

between

JSO

1

•

1

NO

: Replace the main

motor

.

and

J501

-2

and between

J501

-2

I

.

an

d J

50

1

-3

of

the

ma

in

motor

?

I

I

DC c

ontroller

PCB

3

Connect

pin

11

of

IC225

on

the

DC

I

YES

1

Replace

the

DC

controller

PCB.

1

con

troller PCB

to

GND. Does the

main

motor

start

rotating

and

does

I

LED2

02

go

ON

?

Mam

mo

tor

(M 1) 4

I

Connect

pin 11

of

IC225

on

the

DC

YES

Replace t

he

ma

in

motor

.

DC c

ontro

ll

er

PC

B

cont

ro

ller PCB

to

GND.

Is

the

voltage

1

NO

Repl

ace

the

DC

c

ontro

ll

er

PCB.

I

across resistor

R250

about

0.

7V

?

I

I

6-24