Konica Minolta LT-401, LT-411 User Manual

SERVICE MANUAL

MODELS

LT-401/411

Large Capacity Tray Units

(With Parts Catalogs)

SEPTEMBER 2000

CSM - LT401/411

Blank page.

LT-401/LT-411

SERVICE MANUAL

SEPTEMBER 2000

IMPORTANT NOTICE

Because of the possible hazards to an inexperienced
person servicing this equipment, as well as the risk of
damage to the equipment, Konica Business Technolo­gies strongly recommends that all servicing be per­formed by Konica-trained service technicians only.

Changes may have been made to this equipment to
improve its performance after this service manual was
printed. Accordingly, Konica Business Technologies,
Inc., makes no representations or warranties, either
expressed or implied, that the information contained in
this service manual is complete or accurate. It is under­stood that the user of this manual must assume all risks
or personal injury and/or damage to the equipment while
servicing the equipment for which this service manual
is intended.

Corporate Publications Department

© 2000, KONICA BUSINESS TECHNOLOGIES, INC.

All rights reserved.

Printed in U.S.A.

CONTENTS

OUTLINE

LT-401/LT-411 PRODUCT SPECIFICATIONS................. 1

Type............................................................................. 1

Functions .....................................................................1

Machine Data .............................................................. 1

Maintenance ................................................................1

Operating Environment ................................................1

CENTER CROSS-SECTIONAL DRAWING ......................2

DRIVE SYSTEM DRAWING .............................................3

Paper feed drive section..............................................3

Stacked paper up/down wire drive section..................4

UNIT EXPLANATION

PAPER FEED SECTION...................................................6

Composition.................................................................6

Mechanisms ................................................................6

First paper feed control ...............................................7

Up/down plate drive control .......................................10

Remaining paper detection/No paper

detection control ......................................................11

CONTENTS

DISASSEMBLY/ASSEMBLY

PAPER FEED SECTION.................................................12

Cleaning the Paper Dust Removing Brush...............12

Cleaning the PS106 (LT feed PS)/PS107

(LT pre-registration PS) ...........................................12

Removing and Reinstalling the Paper

Feed Roller Unit.......................................................12

Replacing the Paper feed Roller Rubber/Feed

Roller Rubber ..........................................................13

Replacing the Double Feed Prevention Roller

Rubber.....................................................................14

Replacing the MC101 (LT feed MC)/MC102

(LT first paper feed MC) ..........................................15

Replacing the LT-401 Up/Down Wires ......................16

Replacing the LT-411 Up/Down Wires ......................20

DIAGRAMS

ELECTRICAL PARTS LAYOUT ......................................25

CONNECTOR LAYOUT ..................................................26

TIMING CHART (LT-401) ...............................................27

TIMING CHART (LT-411) ...............................................28

OVERALL WIRING DIAGRAM........................................29

iii

CONTENTS

This page left blank intentionally.

iv

SAFETY PRECAUTIONS

SAFETY PRECAUTIONS

Installation Environment

Safety considerations usually are directed toward
machine design and the possibility of human error. In
addition, the environment in which a machine is oper­ated must not be overlooked as a potential safety
hazard.

Most electrical equipment is safe when installed in a
normal environment. However, if the environment is
different from what most people consider to be nor ­mal, it is conceivable that the combination of the
machine and the room air could present a hazardous
combination. This is because heat (such as from
fusing units) and electrical arcs (which can occur
inside switches) have the ability to ignite flammable
substances, including air.

When installing a machine, check to see if there
is anything nearby which suggests that a poten-

tial hazard might exist. For example, a laboratory

might use organic compounds which, when they
evaporate, make the room air volatile. Potentially dan ­gerous conditions might be seen or smelled. The

presence of substances such as cleaners, paint thin­ners, gasoline, alcohol, solvents, explosives, or simi­lar items should be cause for concern.

If conditions such as these exist, take appropriate
action, such as one of the following suggestions.

effect may be caused by altering any aspect of the
machine’s design. Such changes have the potential
of degrading product performance and reducing
safety margins.

For these reasons, installation of any modification not

specifically authorized by Konica Business Machines
U.S.A., Inc., is strictly prohibited.

The following list of prohibited actions is not all-inclu­sive, but demonstrates the intent of this policy.

• Using an extension cord or any unauthorized
power cord adapter.

• Installing any fuse whose rating and physical size
differs from that originally installed.

• Using wire, paper clips, solder, etc., to replace or
eliminate any fuse (including temperature fuses).

• Removing (except for replacement) any air filter.

• Defeating the operation of relays by any means

(such as wedging paper between contacts).

• Causing the machine to operate in a fashion other
than as it was designed.

• Making any change which might have a chance
of defeating built-in safety features.

• Using any unspecified replacement parts.

• Determine that the environment is controlled

(such as through the use of an exhaust hood) so
that an offending substance or its fumes cannot
reach the machine.

• Remove the offending substance.

• Install the machine in a different location.

The specific remedy will vary from site to site, but the
principles remain the same. To avoid the risk of injury
or damage, be alert for changes in the environment
when performing subsequent service on any ma­chine, and take appropriate action.

Unauthorized Modifications

Konica copiers have gained a reputation for being
reliable products. This has been attained by a combi­nation of outstanding design and a knowledgeable
service force.

The design of the copier is extremely important. It is
the design process that determines tolerances and
safety margins for mechanical, electrical, and elec ­tronic aspects. It is not reasonable to expect individu ­als not involved in product engineering to know what

General Safety Guidelines

This copier has been examined in accordance with
the laws pertaining to various product safety regula­tions prior to leaving the manufacturing facility to
protect the operators and service personnel from
injury. However, as with any operating device, compo ­nents will break down through the wear-and-tear of
everyday use, as will additional safety discrepancies
be discovered. For this reason, it is important that the
technician periodically performs safety checks on the
copier to maintain optimum reliability and safety.

The following checks, not all-inclusive, should be
made during each service call:

CAUTION: Avoid injury. Ensure that the copier is
disconnected from its power source before continu­ing.

• Look for sharp edges, burrs, and damage on all
external covers and copier frame.

• Inspect all cover hinges for wear (loose or bro­ken).

• Inspect cables for wear, frays, or pinched areas.

v

SAFETY PRECAUTIONS

• Ensure that the power cord insulation is not dam­aged (no exposed electrical conductors).

• Ensure that the power cord is properly mounted
to the frame by cord clamps.

• Check the continuity from the round lug (GND) of
the power cord to the frame of the copier -- ensure
continuity. An improperly grounded machine can
cause an electrically-charged machine frame.

Safeguards During Service Calls

Confirm that all screws, parts, and wiring which are
removed during maintenance are installed in their
original positions.

• When disconnecting connectors, do not pull the
wiring, particularly on AC line wiring and high
voltage parts.

• Do not route the power cord where it is likely to
be stepped on or crushed.

• Carefully remove all toner and dirt adhering to any
electrical units or electrodes.

• After part replacement or repair work, route the
wiring in such a way that it does not contact any
burrs or sharp edges.

• Do not make any adjustments outside of the
specified range.

Applying Isopropyl Alcohol

Care should be exercised when using isopropyl alco ­hol, due to its flammability. When using alcohol to
clean parts, observe the following precautions:

• Remove power from the equipment.

• Use alcohol in small quantities to avoid spillage

or puddling. Any spillage should be cleaned up
with rags and disposed of properly.

• Be sure that there is adequate ventilation.

• Allow a surface which has been in contact with

alcohol to dry for a few minutes to ensure that the
alcohol has evaporated completely before apply­ing power or installing covers.

Summary

It is the responsibility of every technician to use pro­fessional skills when servicing Konica products. There
are no short cuts to high-quality service. Each copier
must be thoroughly inspected with respect to safety
considerations as part of every routine service call.
The operability of the copier, and more importantly,
the safety of those who operate or service the copier,
are directly dependent upon the conscientious effort
of each and every technician.

Remember...when performing service calls, use good
judgement (have a watchful eye) to identify safety
hazards or potential safety hazards that may be pre­sent, and correct these problem areas as they are
identified -- the safety of those who operate the copier
as well as those who service the copier depend on it!

vi

LT-401/LT-411 PRODUCT SPECIFICATIONS

Type

Type: Side mount type large volume paper feed tray

Functions

Standard size paper :

LT-401: 8.5x5.5/8.5 x 11

Wide paper (maximum 314mm x 223mm)

LT-411: 11 x 17/8.5 x 14/8.5 x 11/8.5 x 11R

Wide paper (maximum 314mm x 459mm)

Maximum quantity:

4000 sheets (22 lb.)

Machine Data

Power source 24V DC/5V (supplied from the main unit), AC27.3V
Max. power consumption

LT-401: Maximum 82W
LT-411: Maximum 100 W

Weight

LT-401: Approximately 66 lb.
LT-411: Approximately 92 lb.

Machine dimensions

LT-401: 16.9(W) x 25.2(D) x 27.2(H) in
LT-411: 26.4(W) x 25.2(D) x 27.4(H) in

LT-401/LT-411

Maintenance

Maintenance: Same as the main unit

Operating Environment

Temperature: 50°F to 86°F
Humidity: 10% to 80%RH

Note: The information herein may subject to change for improvement without notice.

1

LT-401/LT-411

CENTER CROSS-SECTIONAL DRAWING

Feed roller

Conveyance roller

Paper feed roller

Top cover

Up/down wire
(the other side
wire as well)

Double feed
prevention roller

Up/down plate

2

DRIVE SYSTEM DRAWING

Paper feed drive section

LT First paper feed SD

(SD100)

LT-401/LT-411

Feed roller

Paper feed roller

FRONT

Conveyance roller

LT paper feed motor

(M101)

LT First paper feed MC

(MC 102)

LT feed drive MC

(MC101)

FRONT

Double feed
prevention roller

Paper feed roller

Feed roller

3

LT-401/LT-411

Stacked paper up/down wire drive section

LT-401

Up/down plate

FRONT

LT up/down motor
(M100)

Up/down shaft

4

LT-411

LT-401/LT-411

Up/down plate

FRONT

LT up/down motor
(M100)

Up/down shaft

5

LT-401/LT-411

PAPER FEED SECTION

Composition

MC101(LT feed MC)

M101
(LT paper
feed motor)

MC102(LT first paper feed MC)

SD100
(LT first paper feed SD)

Paper dust
removing brush

Conveyance
roller

PS106 (LT feed PS)

PS107 (LT pre­registration PS)

Up/down wire
(the other side wire
as well)

M100
(LT up/down
motor)

Remaining paper
detection gear

Mechanisms

Mechanism Method

*1 Paper lifting Wire drive

Paper feed Paper feed roller
No paper detection Photo sensor (PS108)

+actuator

Paper size detection

*2 Remaining paper Remaining paper de-

detection tection gear+photo

Paper conveyance Roller transport

*1: Paper lifting

a. Up/down plate lifting drive operation

The up/down plate is lifted with the up/down wires.
When the top cover closes, M100 (LT up/down)
rotates and the up/down plate connected to the
up/down wires rises.

None

sensors
(PS102, PS103, PS104,
PS105)

Up/down plate

SW 100 (LT tray down drive switch)

b. Up/down plate down drive operation

The up/down plate automatically lowers by 120
mm when the top cover is opened.
Subsequently, it is lowered by 120 mm each time
SW100 (LT tray down drive switch) is pressed.

*2: Remaining paper detection

The LCT is equipped with a remaining paper
detection gear which rotates together with M100
(LT up/down) driving the up/down plate.
The remaining paper detection gear has an
actuator to turn ON/OFF PS102 (LT remaining
paper detection PS1), PS103 (LT remaining
paper detection PS2), PS104 (LT remaining
paper detection PS3), and PS105 (LT remaining
paper detection PS4).

6

LT-401/LT-411

Each sensor is turned ON/OFF according to the
rotating position of the remaining paper detec­tion gear and since this is linked with the up/down
position of the up/down plate, the remaining
paper quantity in the LCT can be determined by
monitoring the ON/OFF of each sensor. The
remaining paper quantity detected with the four
sensors is displayed on the main body display.

a. LT-401

M100 (LT up/down motor)

Actuator

PS102 (LT
remaining paper
detection PS1)

PS103 (LT
remaining

PS104 (LT
remaining
paper
detection
PS3)

Gear for M100

Remaining
paper detection

PS105 (LT
remaining paper
detection PS4)

gear

b. LT-411

PS102 (LT
remaining paper
detection PS1)

PS103 (LT
remaining
paper
detection
PS2)

PS104 (LT
remaining paper
detection PS3)

paper
detection
PS2)

First paper feed control

LT DB

HTR101

MAIN BODY

HTR101 CONT

AC(H)

24VDC

PGND

5VDC

SGND

LT TXD

LT RXD CLK

LT TXD LATCH

LT TXD CLK

LT ERR
LT RXD
LT ACK
LT REQ

(LT-411 only)M101 H/L

The first paper is fed by the paper feed roller and the
feed roller driver by M101(L T paper f eed) via MC101(L T
feed MC). The feed roller ass'y is lowered by SD100
(first paper-feed) to touch the paper when MC101 (LT
feed) turns ON and dr ive SD100 (LT first paper feed).
After touching and feeding the paper, the feed roller
ass'y is raised by SD100 (LT first paper f eed) to release
the feed roller ass'y from the paper. Then, the paper is
fed into the paper conveyance section by the paper
feed roller which is driven by M101 via MC102 (LT first
paper feed).
The related signals are: PS100 (LT top cover open/
close detection), PS106 (LT feed), PS107 (LT pre­registration), and PS110 (LT jam access door open/
close detection).

5VDC
PS100
SGND

5VDC
PS106
SGND

PS107

5VDC
PS110
SGND

24VDC

MC101 DRIVE

24VDC

MC102 DRIVE

24VDC

SD100 DRIVE

24VDC

M101 CONT

M101 EM

PGND

PS100

PS106

PS107

PS110

MC101

MC102

SD100

MS101 MS102

M101

Actuator

Remaining paper
detection gear

Gear for M100

PS105 (LT
remaining paper
detection PS4)

1. Operation

a. First paper feed timing

Normally, this machine feeds paper at a speed
of 600 mm/s. When the longitudinal length of
paper is 300 mm or more, this machine cannot
complete paper ejection even if paper has
reached the image transfer section. The paper
feed speed of the image transfer section is 370
mm/s at this time. Theref ore, the L T-411 in which
paper with a longitudinal length of 300 mm or
more is set changes the paper feed speed from

7

LT-401/LT-411

600 mm/s to 370 mm/s for the image transfer
section.
Paper with a longitudinal length of less than 300
mm/s is ejected before it reaches the image trans­fer section, so the paper feed speed is fixed at
600 mm/s.
The description given under “Paper with a longi­tudinal length of less than 300 mm is fed in the
following case:” also covers the operation of the
LT-401 that can handle only the paper with a
length of less than 300 mm.

(1) Start of first paper feed

• Paper with a longitudinal length of less than
300 mm is fed in the following case:
At predefined interval after the START button
is pressed(Paper feed speed does not
change.)

• Paper with a longitudinal length of 300 mm or
more is fed in the following case:
High-speed paper feed starts when the speci­fied time lapses after the START button is
pressed. The high speed paper feed feed is
switched to the low speed paper feed after
PS44 (second paper feed) is turned ON and
loop is formed.

(2) Start of second and subsequent papers

• When PS106 (LT feed) is turned OFF by the
preceding paper, the paper feed speed is low
for the paper with a longitudinal length of 300
mm or more.This low speed paper feed is
switched to the high speed paper feed for the
next paper as soon as PS107(LT pre­registration) is turned OFF.

(3) OFF timing

When the specified time lapses after PS106 is
turned OFF by the last paper

b. Interlock

The power supply line of M101 (LT paper feed)
is equipped with MS101 (LT inter l o ck MS1) and
MS102 (LT inter l o ck MS2). When the top cover
is opened, MS101 turns OFF, and when the jam
access door is opened MS102 turns OFF , thereb y
cutting off the power supply to M101.
Furthermore, the top cover is equipped with
PS100 (LT top cover open/close detection) and
the jam access door is equipped with PS110 (LT
jam access door open/close detection) and when
either of these doors is opened during paper feed,
the M101 drive signal is turned OFF to stop the
paper feed operation.

c. Internal heater

The LCT is equipped with HTR101 (LT inter nal
heater) to protect the paper from humidity.
HTR101 is directly controlled by the main body
ACDB (AC drive board) rather than by the LTDB
(LT drive board).

2. Signals

a. Input signals

(1) PS100 (PS100 to LTDB)

Top cover open/close detection signal
[L]: Cover opened
[H]: Cover closed

(2) PS106 (PS106 to LTDB)

Transport roller exit paper detection signal
[L]: Paper detected
[H]: Paper not detected

(3) PS107 (PS107 to LTDB)

Transport roller entrance (pre-registration
position) paper detection signal
[L]: Paper detected
[H]: Paper not detected

(4) PS110 (PS110 to LTDB)

Jam access door open/close detection signal
[L]: Door opened
[H]: Door closed

(5) M101 EM (M101 to LTDB)

M101 rotation error detection signal
[L]: M101 rotating
[H]: M101 not rotating

(6) LT TXD (MAIN BODY to LTDB)

Serial data to transmit main body PRCB operat­ing status to LTDB

(7) LT TXD LATCH (MAIN BODY to LTDB)

LT TXD signal latch signal

(8) LT TXD CLK (MAIN BODY to LTDB)

LT TXD signal clock signal

(9) LT ERR (MAIN BODY to LTDB)

Signal to notify LTDB when there is error in the
main body

(10)LT ACK (MAIN BODY to LTDB)

Serial data transmission enable signal from LCT
to main body PRCB

8

b. Output signal

(1) MC101 DRIVE (LTDB to MC101)

MC101 ON/OFF drive signal
[L]: MC101 ON
[H]: MC101 OFF

(2) MC102 DRIVE (LTDB to MC102)

MC102 ON/OFF drive signal
[L]: MC102 ON
[H]: MC102 OFF

(3) SD100 DRIVE (LTDB to SD100)

SD100 ON/OFF drive signal
[L]: SD100 ON
[H]: SD100 OFF

(4) M101 CONT (LTDB to M101)

M101 ON/OFF control signal
[L]: M101 ON
[H]: M101 OFF

(5) LT RXD (LTDB to MAIN BODY)

Serial data to transmit the L TDB operating status
to main body PRCB

(6) LT RXD CLK (LTDB to MAIN BODY)

LT RXD signal clock signal

(7) LT REQ (LTDB to MAIN BODY)

Serial data send request signal from LCT to main
body PRCB

(8) M101 H/L (LTDB to M101)

M101 speed control signal. (LT-411 only)
[L]: Low speed rotation
[H]: High speed rotation

LT-401/LT-411

9

LT-401/LT-411

Up/down plate drive control

LT DB

MAIN BODY

24VDC

PGND

5VDC

SGND

LT TXD

LT RXD CLK

LT TXD LA TCH

LT TXD CLK

LT ERR
LT RXD
LT ACK
LT REQ

When the top cover opens or closes, M100 (LT up/
down motor) rotates forward or backward to move the
up/down plate up or down. The up/down plate descends
by 120 mm each time SW100 (LT tray down drive
switch) is pressed while the top cover is opened. The
related signals are PS100 (LT top cover open/close
detection), PS101 (L T lower limit detection), and PS109
(LT upper limit detection).

1. Operation

a. Up/down plate descend timing

(1) ON timing

When the top cover is opened and PS100 is
turned OFF, M100 rotates backward to lower the
up/down plate.
When SW100 (LT tray down drive switch) turns
ON by pressing, M100 rotates backward to move
the up/down plate down.

(2) OFF timing

M100 turns OFF at predefined interval after
PS100 turns OFF or SW100 tur ns ON. This in
turn lowers the up/down plate by 120 mm.

(3) Others

The up/down plate descends by 120 mm each
time SW100 is pressed until PS101 turns ON to
indicate the bottom limit of the up/down plate.

5VDC
PS100
SGND

5VDC
PS101
SGND

SW100

5VDC
PS109
SGND

M100 DRIVE
M100 DRIVE

PS100

PS101

SW100

PS109

M100

b. Up/down plate ascend timing

(1) ON timing

When the top cover is closed and PS100 is turned
ON, M100 rotates forward to raise the up/down
plate.

(2) OFF timing

When the up/down plate rises and PS109 (LT
upper limit detection) turns ON to indicate the
detection of the topmost paper, M100 turns OFF
and stops the up/down plate.
The up/down plate also stops when the top cov er
is opened and PS100 turns OFF.

2. Signals

a. Input signals

(1) PS101 (PS101 to LTDB)

Up/down plate lower limit detection signal
[L]: Up/down plate not at lower limit
[H]: Up/down plate at lower limit

(2) PS109 (PS109 to LTDB)

Up/down plate upper limit detection signal
[L]: Up/down plate not at upper limit
[H]: Up/down plate at upper limit

(3) SW100 (SW100 to LTDB)

SW100 ON/OFF detection signal
[L]: SW100 ON
[H]: SW100 OFF

b. Output signals

(1) M100 DRIVE1, 2 (LTDB to M100)

M100 drive signal
These signals switches the direction of the drive
current to control the rotation direction of M100.

10

LT-401/LT-411

Remaining paper detection/No paper
detection control

LT DB

MAIN BODY

24VDC

PGND

5VDC

SGND

LT TXD

LT RXD CLK

LT TXD LA TCH

LT TXD CLK

LT ERR
LT RXD
LT ACK

LT REQ

The remaining paper quantity is detected by PS102
(LT remaining paper detection 1), PS103 (LT remain­ing paper detection 2), PS104 (LT remaining paper
detection 3), and PS105 (LT remaining paper detec­tion 4) and no paper detection is made by PS108 (LT
no paper detection).
The signals detected by these sensors are controlled
by LTDB (LT drive board) and displayed on the main
body display.

1. Operation

a. Remaining paper detection control

The remaining paper quantity is determined from
the ON/OFF combination of sensors PS102,
PS103, PS104, and PS105 which detect the
rotational position of M100 that is driving the up/
down plate. Each sensor turns ON or OFF ac­cording to the position of the remaining paper
detection gear which is linked with the rotation of
M100.
The remaining paper quantity is detectable at
eight levels, but it is displayed on the main body
display as five levels.

5VDC
PS102
SGND

5VDC
PS103
SGND

5VDC
PS104
SGND

5VDC
PS105
SGND

5VDC
PS108
SGND

M100 DRIVE
M100 DRIVE

PS102

PS103

PS104

PS105

PS108

M100

<Remaining paper quantity and display>

Stacked
paper

PS102 PS103 PS104 PS105

quantity
0 to 700
701 to 1200
1201 to 1700
1701 to 2200
2201 to 2700
2701 to 3200
3201 to 3700
3701 or

OFF
ON
ON
ON
ON
OFF
OFF
OFF

OFF
OFF
ON
ON
ON
ON
OFF
OFF

OFF
OFF
OFF
ON
ON
ON
ON
OFF

Remaining
paper quantity
display

1 flashing

OFF

1 on

OFF

2 on

OFF

2 on

OFF

3 on

ON

3 on

ON

4 on

ON

4 on

ON

more

Caution:

The remaining paper quantity is indicated
on the control panel with four horizontal bars.
Stacked paper quantity differs depending on
the thickness of the paper.

b. No paper detection control

When there is no more paper inside the LCT,
PS108 turns ON and a message is displayed on
the main body display.

2. Signals

a. Input signals

(1) PS102 (PS102 to LTDB)

Remaining paper detection gear rotational
position detection signal
[L]: PS102 OFF
[H]: PS102 ON

(2) PS103 (PS103 to LTDB)

Remaining paper detection gear rotational
position detection signal
[L]: PS103 OFF
[H]: PS103 ON

(3) PS104 (PS104 to LTDB)

Remaining paper detection gear rotational
position detection signal
[L]: PS104 OFF
[H]: PS104 ON

(4) PS105 (PS105 to LTDB)

Remaining paper detection gear rotational
position detection signal
[L]: PS105 OFF
[H]: PS105 ON

(5) PS108 (PS108 to LTDB)

LCT no paper detection signal
[L]: No paper
[H]: Paper present

11

LT-401/LT-411

PAPER FEED SECTION

Cleaning the Paper Dust Removing

Brush

Caution: If LT is connected to the main

unit, make sure that main unit
power plug is disconnected
from the power outlet.

a. Procedure

(1) Open the top cover.
(2) Remove the two screws to detach the paper feed

cover B.

Top
cover

Screws

Cleaning the PS106 (LT feed PS)/PS107
(LT pre-registration PS)

Caution: If LT is connected to the main

unit, make sure that main unit
power plug is disconnected
from the power outlet.

a. Procedure

(1) Looking into the paper ejection side of the LCT

from below, and clean sensors through the cavity
for PS106 and the cavity for PS107 using a
blower brush or the like.

Cavity for PS106

Cavity for PS107

Paper
exit
side

Paper feed cover B

(3) Insert a flat bladed screwdriver in the slots (in two

locations) for paper dust removing brush to re­lease the locking lugs, then remove the paper
dust removing brush.

Paper dust removing
brush

Cavity

Locking lugs

(4) Clean the paper dust removing brush using a

blower brush or the like.

(5) Reinstall the above parts following the removal

steps in reverse.

Removing and Reinstalling the Paper
Feed Roller Unit

Caution: If LT is connected to the main

unit, make sure that main unit
power plug is disconnected
from the power outlet.

a. Procedure

(1) Open the top cover.
(2) Remove the spring from the paper feed roller unit.

Top cover

Spring

Remove
this.

Paper feed roller
unit

Paper feed roller unit

12

LT-401/LT-411

(3) After removing the two retaining rings, remove

the two bearings outward to remove the paper
feed roller unit.

Paper feed roller unit

Bearing

Retaining
ring

Bearing

Retaining
ring

(4) Reinstall the above parts following the removal

steps in reverse.

Replacing the Paper feed Roller Rubber/
Feed Roller Rubber

Caution: If LT is connected to the main

unit, make sure that main unit
power plug is disconnected
from the power outlet.

a. Procedure

(1) Remove the paper feed roller unit.
(2) Remove the bearing and paper feed reference

actuator.

(3) Remove the two retaining rings.

(4) Remove the bearing outward to detach the roller

section from the roller fitting.

Roller fitting

Retaining
ring

Bearing

Bearing

(5) Remove the bearing from the opposite side of the

coupling, then remove the paper feed roller from
the shaft.

(6) Remove the retaining ring to pull the feed roller

from the shaft.

(7) Remove the rubber from each roller.

Paper feed roller rubber

Paper feed
roller

Shaft

Coupling

Paper feed reference actuator

Bearing

13

Bearing

Retaining
ring

Shaft

Feed roller
rubber

Feed roller

Paint
mark

LT-401/LT-411

(8) Reinstall the above parts following the removal

steps in reverse.

Caution 1: Make sure rollers and rubber por-

tions are oriented properly when
reinstalling them.

Caution 2: Make sure the one-way clutch

direction is correct.

Caution 3: Check whether grease or the like

is present on each roller.

Replacing the Double Feed Prevention
Roller Rubber

Caution: If LT is connected to the main

unit, make sure that main unit
power plug is disconnected
from the power outlet.

a. Procedure

Caution: With the power held on, press the

SW100 (L T tray down s witch) to mov e
the up/down plate down to the bottom

in advance.
(1) Remove the paper feed roller unit.
(2) Remove the two screws to detach the double

feed prevention roller unit cover.

(3) Remove the two screws to detach the double

feed prevention roller unit.
Caution: When reinstalling the double feed

prevention roller unit, tighten the
screws on the rear side first.

Double feed prevention roller unit

Screws

(4) Remove the two retaining rings, fit the shaft into

the D-cut in the fitting, and remove the double
feed prevention roller together with the shaft.

Double feed
prevention roller

Double feed
prevention roller
unit cover

Screws

Double feed
prevention roller

D-cut

Retaining ring

14

LT-401/LT-411

(5) Remove the double feed prevention roller rubber

from the double feed prevention roller.

Paint mark

Double feed
prevention roller

Shaft

Double feed
prevention roller
rubber

(6) Reinstall the double feed prevention roller in the

reverse order of the removal procedure.

Caution 1: Make sure the double f eed pre ven-

tion roller rubber is oriented
properly when reinstalling it.

Caution 2: Check whether scratch or like is

visible on the pet cock for the
drive gear.

Caution 3: Check whether grease or the like

is present on double feed roller.

Replacing the MC101 (LT feed MC)

MC102 (LT first paper feed MC)

a. Procedure

(1) Open the top cover.
(2) Remove the spring from the paper feed roller unit.
(3) Remove the two screws to detach the top cover.

Top cover

Screws

(4) Remove the two screws to detach the clutch

replacement cover.

Clutch replacement
cover

15

Screws

LT-401/LT-411

(5) Disconnect two relay connectors (CN765, CN766)

of the clutches.

(6) Remove the retaining ring to detach each clutch.

MC101 (LT Paper feed MC)

Retaining
ring

Relay
connector
(CN766)

MC102 (LT first
paper feed MC)

Retaining
ring

Relay connector
(CN765)

(7) Reinstall the above parts following the removal

steps in reverse.

Caution: When installing each MC, make

sure that the stopper of each clutc h

is on the predefined position.

(3) Remove the four screws to detach the right side

cover.

Screws

Right side
cover

Screws

(4) After opening the jam access door, remove the

four screws to detach the front cover.

Caution: Remove the four screws and then

remove the front cover with the
jam access door closed.

Replacing the LT-401 Up/Down Wires

a. Procedure

Caution: With the power held on, press the

SW100 (L T tray down s witch) to mov e

the up/down plate down to the bottom

in advance.
(1) Open the top cover.
(2) Remove the clutch replacement cover.

Jam access door

Screws

Screws

Right side cover

16

LT-401/LT-411

(5) Remove the five screws to detach the rear cover.

Screw

Rear cover

Screws

Screws

(6) Remove the five relay connectors (CN749,

CN780, CN781, CN782, CN783) to disconnect
the wiring harness from the up/down motor mount-

ing plate.
(7) Remove the E-ring to detach the up/down gear.
(8) Pull the pin from the shaft.
(9) Remove the E-ring to detach the bearing.
(10)Remove the three screws to detach the up/down

motor assembly.

(11)Replace the up/down wire following the instruc-

tions in “Removing Up/Down Wires” and “Install­ing Up/Down Wires.”

Caution: Four up/down wires with different

length, two at the front and two at the
back, are used. Wires with the same
length can be used either at the front
or back if they are used in the same
location.

1323.6mm

Wire A

1250.3mm

Wire B

769.3mm

Wire C

661mm

Wire D

Up/down
motor
assembly

Shaft

Relay connector
(CN749)

Screw

Pin

Screw

Bearing

Relay
connector
(CN780)

E-ring

Relay
connector
(CN781)

Relay
connector
(CN782)

Relay
connector
(CN783)

Screw

Up/down
gear

E-ring

17

LT-401/LT-411

<Removing the Up/Down Wires>

Up/down plate

Wire B

14.Release the metal
ball to remove wire
A.

7. Release the metal
ball to remove wire
C.

9. Release the metal
ball to remove wire
D.

12.Release the metal
ball to remove wire
B.

Wire A

Wire B

Wire A

2. Release the metal
ball to remove wire
C.

18.Release the metal
ball to remove wire
A.

4. Release the metal
ball to remove wire
D.

16.Release the metal
ball to remove wire
B.

Wire D

Wire C

1. Remove the E-ring.

3. Remove the pulley.

5. Remove the pulley.

Wire C

Wire D

6. Remove the E-ring.

8. Remove the pulley.

10.Remove the pulley.

11.Remove the E-ring,
then remove the
pulley to release
wire B.

FRONT

13.Remove the pulley to
release wire A.

Up/down
shaft

15.Remove the E­ring, then remove
the pulley to
release wire B.

17.Remove the pulley
to release wire A.

18

<Installing the Up/Down Wires>

LT-401/LT-411

Wire A
Wire B

7. Insert wire A in the
pulleys, then attach a
metal ball.

15.Insert wire C in the
pulleys, then attach a
metal ball.

12.Insert wire D in the
pulleys, then attach a
metal ball.

10.Insert wire B in the
pulleys, then attach a
metal ball.

Wire C

Wire D

13.Insert wire C in the up/
down shaft, attach a
pulley, and secure the
pulley with an E-ring.

14.Wind wire C around
the pulley by 6 turns in
such a manner that the
wire can be pulled
from over the pulley.

Wire B

Wire A

FRONT

Up/down plate

Up/down
shaft

1. Insert wire A in
the up/down

6.
shaft, attach
pulleys, then
pull the wire
from under the
pulleys.

20.Insert wire B in the pulleys,
then attach a metal ball.

2. Insert wire A in the pulleys,
then attach a metal ball.

17.Insert wire D in the pulleys,
then attach a metal ball.

5. Insert wire B in the pulleys,
then attach a metal ball.

Wire D

Wire C

18.Insert wire C in the up/
down shaft, attach a
pulley, and secure the
pulley with an E-ring.

19.Wind wire C around
the pulley by 6 turns
in such a manner that
the wire can be pulled
from over the pulley.

6 turns

6 turns

11.Insert wire D in the up/
down shaft, attach a
pulley, and wind wire
D around the pulley by
six turns in such a
manner that the wire
can be pulled from
over the pulley.

6 turns

3. Insert wire B in the up/
down shaft, attach a

8.
pulley, and secure the
pulley with E-rings.

4. Pull wire B from under the
pulleys.

9.

19

16.Insert wire D in the up/
down shaft, attach a
pulley, and wind wire
D around the pulley by
six turns in such a
manner that the wire
can be pulled from
over the pulley.

6 turns

LT-401/LT-411

(12)After installing the up/down wires, make sure the

up/down wires are passed in the grooves in the
pulleys properly and wires do not run on the sides
of the pulleys. Also make sure the up/down plate
can be moved up and down smoothly by hand.

Caution: If the up/down plate does not move

up and down smoothly, reinstall the
up/down wires.

(13)Install the up/down wire drive motor assembly,

up/down gear, and relay connectors, following

the removal steps in reverse.
(14)Remove the E-ring to detach the idle gear.
(15)Rotate the remaining paper detection gear until

the round hole in this gear is aligned with the

oblong hole in the up/down motor mounting plate.

Caution: Align when the up/down plate is in

lowest position.

Up/down motor
mounting plate

Remaining paper
detection gear

Replacing the LT-411 Up/Down Wires

a. Procedure

Caution: With the power held on, press the

SW100 (L T tray down s witch) to mov e
the up/down plate down to the bottom
in advance.

(1) Remove the clutch replacement cover, side cover

(right), front cover, and rear cover following the
steps (1) to (5) in [7] Replacing the LT-401 Up/

Down Wires.
(2) Remove the E-ring.
(3) Remove the five screws to detach the gear cover.
(4) Remove the two bearings.

Screw

Round
Oblong
hole

E-ringIdle gear

hole

(16)Install the idle gear.
(17)Attach the covers following the removal steps in

reverse.
Caution: After replacing the up/down wires,

correct horizontal and centering of the
up/down plate. (Refer to “ADJUST­MENT SECTION.”)

Screw

Gear cover

E-ring

Bearing

Screws

Bearing

(5) Remove the gear A.
(6) Remove the E-ring to remove gear B.
(7) Remove the detent pin for gear B from the up/

down pulley shaft.

(8) Remove the E-ring and bearing to remove gear C.

Bearing

Gear C

20

Gear A

Pin

Gear B

E-ring

E-ring

Up/down pulley shaft

LT-401/LT-411

(9) Remove the bearing behind gear C.
(10)Remove the E-ring to remove the up/down gear.
(11)Remove the detent pin for up/down gear from the

up/down pulley shaft.
(12)Remove the E-ring to remove gear D.
(13) Remove the E-ring to remove the remaining

paper detection gear.
(14)Remove the four relay connectors (CN780,

CN781, CN782, and CN783) to disconnect the

wiring harness from the up/down motor mounting

plate.

Relay connector
(CN780)

Remaining paper
detection gear

Gear D

Relay
connector
(CN781)

Relay connector
(CN782)

Up/down motor
mounting plate

(17) Replace the up/down wire following the instruc-

tions in “Removing the Up/Down Wires” and
“Installing Up/Down Wires.”

Caution: Four up/down wires with different

length, two at the front and two at the
back, are used. Wires with the same
length can be used either at the front
or back if they are used in the same
location.

1057.3mm

Wire A

692.1mm

Wire B

1321.7mm

Wire C

1303.1mm

E-ring

Pin

Relay

Up/down
gear

E-ring

Up/down pulley shaft

Bearing

connector
(CN783)

E-ring

(15)Remove the E-ring to remove the bearing.
(16)Remove the six screws to remove the up/down

motor mounting plate.

Up/down motor mounting plate

Screws

Wire D

Bearing

E-ring

Screws

21