Parts marked with "" are important for maintaining the safety of the set. Be sure to replace these parts with
specified ones for maintaining the safety and performance of the set.
This document has been published to be used
SHARP CORPORATION
for after sales service only.
The contents are subject to change without notice.
Page 2
MX-LCX4
[1]SPECIFICATIONS
FormLarge Capacity Trays (3 Trays)
Transport speed85 – 110 sheets/minute to be supported
Transport standardCenter alignment
Paper sizeA4, A5R, B5, 8.5 x 11, 5.5 x 8.5R, 9 x 12 (A4W)
Paper size labelAvailable
Paper size settingUpper tray: User setting (Size setting by guide at Interior side of tray)
Paper size setting for shipmentInch: 8.5 x 11
Feedable paper size/weightUpper tray: 52 – 205 g/m
Paper typePlain paper, Heavy paper, Recycled paper, Thin paper, Pre-printed paper, letter head, Punched paper, Transparency paper,
Paper capacityStandard Paper
Detection of remaining paperAvailable level detection (5 levels)
Paper supplyPaper supply from the upper section by the front loading method
Tray rising/falling timeRisingUpper tray / Middle tray: 10 seconds or less
ReliabilityMCBJin compliance with the main unit
Life5 years or 24,000K
Power consumption150W or less
Power sourceDC24V (Supplied by the main unit)
DimensionsW526 x D728 x H980 mm
Occupied dimension540 x 730 mm
WeightApproximately 95 kg
Installation/Maintenance By service person
HeaterAC 18W x 2 36W (Service parts: 0PQC4150431//)
Middle tray: User setting (Size setting by guide at Interior side of tray)
Lower tray: Service setting (Size setting by operation panel)
Lower tray : 15 seconds or less
Time required from tray insertion to empty detection without paper
Service Manual
MX-LCX4 SPECIFICATIONS 1 – 1
Page 3
Paper Size/Type/Weight
LCT(A4)
Uppe r Tr ayMi dd le Tr ayLo wer Tra y
Minimum paper weight52 g/m
2
(14 lbs bond)
Maximum paper weight205 g/m
2
(40 lbs bond)
(110 lbs index)
(65 lbs cover)
Paper typeThin paperYes
(Even 52 g/m
2
(110 lbs index)
(65 lbs cover)
(Even 52 g/m
is possible)
Plain paperYesYesYes
Recycled paperYesYesYes
Colored paperYesYesYes
Letter headYesYesYes
Pre-printed paperYesYesYes
Pre-punched paperYesYesYes
Heavy paper 1 (106 – 128 g/m
Heavy paper 2 (129 – 176 g/m
Heavy paper 3 (177 – 205 g/m
Heavy paper 4 (206 – 300 g/m
Ledger (11" x 17")279 x 432———
Ledger (11" x 17") Z folding279 x 216———
Legal (8.5" x 14")216 x 356———
Legal (8.5" x 14") Z folding216 x 178———
Mexican Legal (8.5" x 13.4")216 x 340———
Foolscap (8.5" x 13")216 x 330———
Letter (8.5" x 11")279 x 216YesYesYes
Letter R (8.5" x 11" R)216 x 279———
Letter R (8.5" x 11" R) Z folding216 x 140———
Invoice (5.5" x 8.5")216 x 140———
Invoice R (5.5" x 8.5" R)140 x 216YesYesYes
Exective R (7.25" x 10.5")184 x 266———
9 x 12 (A4W)305 x 229YesYesYes
A3297 x 420———
A3 Z folding297 x 210———
B4257 x 364———
B4 Z folding257 x 182———
A4297 x 210YesYesYes
A4-R210 x 297———
A4-R Z folding210 x 148———
B5257 x 182YesYesYes
B5-R182 x 257———
A5210 x 148———
A5-R148 x 210YesYesYes
SRA3320 x 450 mm———
SRA4320 x 225 mm———
318 x 234.75 mm———
312.5 x 220 mm———
318 x 469.5 mm———
312.5 x 440 mm———
8K270 x 390———
16K270 x 195———
16K-R195 x 270———
Postcard100 x 148———
Special – Custom size
Custom Range
min Main———
NoNoNo
max Main———
min Sub———
max Sub———
Special – Size uncertain———
2
52 g/m
(14 lbs bond)
2
205 g/m
(40 lbs bond)
Ye s
is possible)
(14 lbs bond)
163 g/m
(90 lbs Index)
2
(Even 52 g/m
is possible)
52 g/m
Yes
2
2
2
MX-LCX4 SPECIFICATIONS 1 – 2
Page 4
MX-LCX4
[2]MAINTENANCE
Service Manual
1. Maintenance table
: Check (Clean, replace or adjust as needed) {: Clean : Replace : Adjust ✩: Lubricate : Shift position
[Note 1] Roller life 200K When there is dirt, wipe with cloth
[Note 1] Roller life 200K When there is dirt, wipe with cloth
[Note 1] Roller life 200K When there is dirt, wipe with cloth
Tool, oil, chemicals Procedure
Treatment after procedure
cloth.
and water.
and water.
and water.
and water.
[Note 1] Replacement reference: Replace according to each paper feed counter value.
MX-LCX4 Paper feed tray 1, 2, 3: 200K or 1 year Torque limiter: 800K
(NOTE) Paper feed section roller life
Each roller life is as shown on the left. When, therefore, a certain paper feed unit is excessively used, its life may be expired before the maintenance timing.
Actually, however, different sizes of paper are used with different paper feed trays, and it is quite rare that the roller replacement must be made
before the maintenance timing.
If a certain size of paper must be heavily used, set different paper feed trays for that paper size. This information must be explained to the user.
When servicing, check the use frequency of each paper feed tray, and replace the rollers as needed.
When cleaning the roller, it is advisable to use a cloth with a small quantity of water.
The friction level is smaller in the order of the paper pick-up roller, the paper feed roller, and the separation roller.
MX-LCX4 MAINTENANCE 2 – 1
Page 5
MX-LCX4
[3]REPLACEMENT AND
ADJUSTMENT
1. Front door and covers
Service Manual
[E]
[B]
[A] Top cover (screw x 4).
[B] Front door (stopper x 1).
NOTE: While lifting the top cover, remove the snap ring and front
door.
[C] Rear cover (screw x 6).
[D] Right cover (screw x 6).
[E] Paper slot cover (screw x 2).
[A]
[C]
[D]
2. Inner cover, paper feed unit
[F]
• Open the front door.
• Remove right cover (see 1.)
Remove:
[A] Pull out tray and remove it (screw x 4)
[B] Knobs (x 3) (screw x 1 each)
[C] Upper inner cover (screw x 2)
[D] Knob (screw x 1)
[E] Lower inner cover (screw x 1)
[F] Paper feed unit (connector x 1, screw x 2)
3. Paper feed roller
[B]
[A]
[C]
[E]
[A]
Remove:
• Remove the right cover (see 1.)
• Remove the paper trays. (see 2.)
[A] Pick-up roller (stopper x 1).
[B] Feed roller (stopper x 1).
[C] Separation roller (stopper x 1).
[C]
[B]
[D]
MX-LCX4 REPLACEMENT AND ADJUSTMENT 3 – 1
NOTE: 1) The LCT pick-up and separation rollers are the same
as pick-up and separation rollers of the main machine.
These rollers are interchangeable.
2) The feed rollers of the LCT and main machine are different because they are designed to rotate in opposite
directions. The feed rollers of the LCT and main
machine are not interchangeable.
3) Never touch the surface of the rollers with bare hands.
• Clear the PM counters for the new rollers (see Section "2. Preventive Maintenance).
Page 6
4. LCT motors
C. 4th transport motor
A. Paper feed, grip motors
[A]
(1)
(2)
[C]
(3)
[B]
[C]
[A]
[B]
(1)
[D]
Each paper feed unit has a paper feed motor (1) and a grip motor
(2). The removal procedure is the same for each feed tray.
• Attach the tension spring, then tighten the screws (3) to tighten
the belts.
B. 6th lift motor
Remove:
• Rear cover. (see 1.)
[A] 4th Transport motor unit (screw x 5, connector x 1).
[B] Spring (x 1). First, loosen screw (1) (screw x 1).
[C] 4th transport motor (screw x 2, Timing belt x 1)
Reinstallation
• Be sure that the tension spring is connected, then tighten the
screw (1).
[A]
Remove:
• Rear cover (see 1.)
[A] 6th lift motor (screw x 2, connector x 1)
MX-LCX4 REPLACEMENT AND ADJUSTMENT 3 – 2
Page 7
D. 5th transport motor
[A]
[C]
(1)
[B]
[B]
[C]
Remove:
• Rear cover. (see 1.)
[A] Motor unit (screw x 4, connector x 1).
[B] Spring (x 1). First, loosen screw (1) (screw x 1).
[C] 5th Transport motor (screw x 2, Timing belt x 1)
Reinstallation
• Be sure that the tension spring is connected, then tighten the
screw (1).
(1)
E. LCT exit motor
Remove:
• Remove the rear cover. (see 1.)
[A] Motor unit (screw x 6, connector x 1).
[B] Spring (x 1). First, loosen screw (1) (screw x 1).
[C] LCT exit motor (screw x 2, Timing belt x 1)
Reinstallation
• Be sure that the tension spring is connected, then tighten the
screw (1).
F. 6th transport motor
[A]
[B]
[C]
[A]
(1)
Remove:
• Rear cover. (see 1.)
[A] Motor unit (screw x 6, connector x 1).
[B] Spring (x1). First, loosen screw (1) (screw x 1).
[C] LCT exit motor (screw x 2, Timing belt x 1)
Reinstallation
• Be sure that the tension spring is connected, then tighten the
screw (1).
MX-LCX4 REPLACEMENT AND ADJUSTMENT 3 – 3
Page 8
G. 4th, 5th lift motors
[A]
B. Image position sensor board
[E] Image position sensor board (screw x 2, clamp x 1, connector x
2)
C. Exit sensor
[F] Exit sensor unit (screw x 1, connector x 1, clamp x 1)
[G] Exit sensor
6. Paper height sensors, paper size
sensors
[B]
[C]
Remove:
• Rear cover. (see 1.)
[A] Main control board bracket (screw x 5, connector x All)
[B] 4th lift motor (screw x 3, connector x 1)
[C] 5th lift motor (screw x 3, connector x 1)
5. Image position sensor board, exit
sensor
[E]
[A]
[C]
[A]
[C]
[A]
[B]
[B]
4th/5th Tray
6th Tray
Remove:
• Rear cover. (see 1.)
• Right cover. (see 1.)
[A] Paper height sensor unit (clamp x 2, screw x 1, connector x 4).
[B] Paper height sensors (Hooks x 4 each)
[C] Paper size sensors (connector x 1 each)
7. Main control board
[A]
[B]
[D]
[G]
[F]
A. Image position sensor
Disconnect the LCT from the copier.
[A] Harness cover (screw x 1, clamp x 1)
[B] Image position sensor unit (screw x 1, clamp x 1, connector x 1)
[C] Stopper (screw x 1)
[D] Image position sensor
• After replacing the image position sensor, do the procedure for
image position sensor adjustment. (see 9.)
MX-LCX4 REPLACEMENT AND ADJUSTMENT 3 – 4
Remove:
• Rear cover. (see 1.)
[A] Main control board (screw x 6, Standoffs x 2, connector x All)
Page 9
8. Side registration adjustment
[A]
Normally the side registration of the image can be adjusted in the
SP mode.
If the punch hole positions are not aligned from a particular feed
station, however, you can manually adjust the side registration by
changing the tray cover position for that tray, and then adjust the
side registration of the image.
1) Pull out the tray.
2) Change the screw positions [A] at both the right and left sides
3) Remove the interface harness plate (2 screws), and remove
the harness.
Screw (x 2)
Interface harness
4) Install a new interface harness, and insert the connector into
the PWB.
Fix the earth wire of the heater harness with the accessory
washer screw.
6) Install the heater cover. (3 screws)
Install the rear cabinet and fix it with the screw.
Interface harness
Heater harness
section
Snap band fixing
Earth fixing screw
5) Fix the two heaters with two screws for each of them, and fix
the harness with the snap band.
Snap band fixing
(3 positions)
MX-LCX4 REPLACEMENT AND ADJUSTMENT 3 – 6
Page 11
MX-LCX4
[4]DETAILED DESCRIPTIONS
1. Paper feed
A. Paper feed rollers
[B]
[D]
[A]
C. Pick-up and feed
Service Manual
[D]
[C]
[C]
This LCT has three paper tray feed stations:
The 4th and 5th tray each hold 1,000 sheets of paper. The 6th tray
holds 2,550 sheets of paper. Total: 4,550 sheets
Each tray contains four rollers:
[A] Pick-up roller
[B] Paper feed roller
[C] Separation roller
[D] Grip roller
NOTE: The pick-up roller, paper feed roller, and separation roller
are a standard FRR paper feed system.
B. Paper feed motors
[E]
[F]
Two stepper motors control the paper feed drive:
[A] Paper feed motor
[B] Grip motor
The paper feed motor drives the pick-up roller [C] and the paper
feed roller [D].
The grip motor drives the grip roller [E] that feeds the paper out of
the tray, and the separation roller [F].
[D]
[C]
[B]
[A]
[E]
[F]
[G]
[B]
[A]
When a paper feed station is not selected:
• Separation roller solenoid [A] is de-activated
• Separation roller [B] turns freely.
When the paper feed station is selected for a job:
• Paper feed motor [C] and grip motor [D] turn on.
When the feed motor [C] turns on, it drives the feed roller [E]. It also
drives the pick-up roller [F] because the pick-up roller is linked to
the feed roller by an idle gear.
When the separation solenoid [A] turns on, the separation roller [B]
contacts the paper feed roller [E] and turns with the feed roller,
unless more than one sheet of paper is fed. The three trays of the
LCT unit use the standard FRR mechanism.
When the paper feed motor turns on, the pick-up solenoid turns on
and the pick-up roller [F] lowers until it contacts the top sheet of the
paper stack and then sends it to the paper feed and separation rollers.
When the paper feed sensor detects the leading edge of the paper,
the paper feed motor switches off, the pick-up roller lifts, and the
grip rollers [G] feed the paper out of the tray.
MX-LCX4 DETAILED DESCRIPTIONS 4 – 1
Page 12
2. Paper lift
A. Tray detection
When a tray is set in the machine, the tray detection method used
depends on the tray:
• The upper tray and middle tray are detected when any one of the
paper size switch signals is low.
• The lower tray is detected when the switch 1 signal of the paper
size switch is low.
[E]
[F]
[E]
C. Lift sensor
[D]
[A]
[E]
[C]
[B]
[J]
[G]
[D]
[C]
When the lift motor turns on, the pick-up solenoid [A] activates to
lower the pick-up roller [B]. When the top sheet of paper reaches
the proper paper feed level, the paper pushes up the pick-up roller
and the actuator [C] on the pick-up roller supporter [D] de-activates
[A]
[B]
H]
[
the lift sensor [E] to stop the lift motor.
After several paper feeds, the paper level gradually lowers, then
the lift sensor is activated and the lift motor turns on again until the
lift sensor is de-activated again.
3. Paper size detection
[A]
[I]
B. Lift mechanism
When the machine detects that the paper tray is set in the machine,
the tray lift motor [A] rotates and the coupling gear [B] on the tray lift
motor engages the pin [C] of the lift drive shaft [D]. The tray drive
belts [E] are connected to the tray bottom plate [F] and are driven
by the tray lift motor via the lift drive shaft [D] and tray drive pulleys
[G]. When the lift motor turns counterclockwise, the tray bottom
plate [F] moves up. The tray goes up until the top of the paper stack
pushes up the pick-up roller and the lift sensor in the feed unit is
de-activated.
When the actuator [H] on the rear end of the bottom plate activates
the paper height sensors [I], the remaining paper capacity is
detected. (see 4.)
When pulling out the tray, the coupling gear [B] separates from the
pin [C], so that the tray bottom plate moves downward. In the bottom tray, the damper [J] lets the tray bottom plate drop slowly.
MX-LCX4 DETAILED DESCRIPTIONS 4 – 2
[B]213
A4-
B5-
SW10100011
LEF
SW21010001
SW31101000
LEF
A5LEF
A5-
SEF
LT-
LEF
HLTLEF
1: HI 0: LOW
HTL-
SEF
A. Top tray (tray 4) and middle tray (tray 5)
For the top and middle trays, the paper size switch [A] detects the
paper size. The paper size switch contains three microswitches.
The paper size switch is actuated by an actuator plate [B] at the
rear of the tray. Each paper size has its own unique combination as
shown in the table and the CPU determines the paper size by the
combination.
B. Bottom tray (tray 6)
The bottom tray has the same switch as the top and middle trays.
However, it is only used for detecting when the tray is pushed in.
For the bottom tray, the paper size must be selected in the SP5019007:
Page 13
4. Remaining paper detectiion
[E]
[A]
[D]
[C]
[B]
The amount of paper remaining in the tray is detected by the three
paper height photo-interrupter sensors on the left rail as the bottom
plate rises. Five states, determined by the position of the actuator
are possible.
1) With the actuator [A] below paper height sensor 1 [B], no sen-
sor is actuated and the display indicates 100%.
2) When the actuator passes paper height sensor 1 [B] , the dis-
play indicates 75% of the paper supply remaining.
3) When the actuator passes paper height sensor 2 [C], the dis-
play indicates 50% of the paper supply remaining.
4) When the actuator passes paper height sensor 3 [D], the dis-
play indicates 25% of the paper supply remaining.
NOTE: When the actuator enters the gap of the near end sensor
[E], the machine signals near end.
Finally, when the last sheet feeds, the paper end sensor signals
that the tray is empty. (see 5.)
5. Paper end detection
[A]
[B]
The paper end sensor [A] detects the top sheet of the paper in the
tray by monitoring the reflected light. When the paper tray runs out
of paper, the paper end sensor does not receive the reflected light
due to the cutout [B]. Then, the tray lift motor rotates backwards 2
seconds to drop the tray bottom plate.
MX-LCX4 DETAILED DESCRIPTIONS 4 – 3
Page 14
MX-LCX4
[5]OVERALL MECHANICAL
2. Drive layout
Service Manual
INFORMATION
1. Mechanical component layout
11
(1)
10
9
(2)
8
7
(3)
M1
M3
M4
4
M8
M2
M13
M5
5
M7
M6
M12
6
M9
M10
M11
14th Paper Feed Unit
25th Paper Feed Unit
36th Paper Feed Unit
44th Tray Drive Belt
55th Tray Drive Belt
66th Tray Drive Belt
7Lower Transport Rollers
8Horizontal Transport Roller
M14th Grip Motor
M24th Lift Motor
M34th Paper Feed Motor
M44th Transport Motor
M55th Grip Motor
M65th Lift Motor
M75th Paper Feed Motor
M85th Transport Motor
M96th Grip Motor
M106th Lift Motor
M116th Paper Feed Motor
M126th Transport Motor
M13LCT Exit Motor
MX-LCX4 OVERALL MECHANICAL INFORMATION 5 – 1
Page 15
3. Electrical components
S33
S50
SOL5
S34
S36
S35
SOL6
SW1
S44th Paper Height Sensor 1
S54th Paper Height Sensor 2
S64th Paper Height Sensor 3
S74th Paper Height Sensor 4
S124th Paper Size Sensors
S154th Relay Sensor
S174th Transport Sensor
S215th Paper Height Sensor 1
S225th Paper Height Sensor 2
S235th Paper Height Sensor 3
S245th Paper Height Sensor 4
S295th Paper Size Sensors
S335th Transport Sensor
S346th Lift Sensor
S356th Paper End Sensor
S366th Paper Feed Sensor
S376th Paper Height Sensor 1
S386th Paper Height Sensor 2
S396th Paper Height Sensor 3
S406th Paper Height Sensor 4
S456th Paper Size Sensors
S496th Transport Sensor
S50Exit Sensor
NOTE: Items S34, S35, S36, SOL5 and SOL6 are duplicated in
the 4th and 5th units.
S15
S17
M8
M13
M12
M9
1Main Control Board
2Anti-Condensation Heaters (Options)
M14th Grip Motor
M24th Lift Motor
M34th Paper Feed Motor
M44th Transport Motor
M55th Grip Motor
M65th Lift Motor
M75th Paper Feed Motor
M85th Transport Motor
M96th Grip Motor
M106th Lift Motor
M116th Paper Feed Motor
M126th Transport Motor
M13LCT Exit Motor
M4
S7
S49
S12
S24
S45
S40
S39
S38
S37
S6
M1
S5
S4
S29
S23
S22
S21
M3
M5
M7
M2
1
M6
M11
M10
2 (Option:
0PQC4150431//)
MX-LCX4 OVERALL MECHANICAL INFORMATION 5 – 2
Page 16
4. A4/LT LCT MX-LCX4 layout
(with bypass)
M3
M4
S8
M1
S17
S3
M4
M5
M8
S15
M13
S33
S50
M14th Grip Motor
M1Paper Feed Motor Bypass (MX-MFX2)
M34th Paper Feed Motor
M3Transport Motor Bypass (MX-MFX2)
M44th Transport Motor
M4Grip Motor Bypass (MX-MFX2)
M55th Grip Motor
M75th Paper Feed Motor
M85th Transport Motor
M96th Grip Motor
M116th Paper Feed Motor
M126th Transport Motor
M13LCT Exit Motor
S34th Paper Feed Sensor
S4Paper Feed Sensor Bypass (MX-MFX2)
S8Transport Sensor Bypass (MX-MFX2)
S154th Relay Sensor
S174th Transport Sensor
S205th Paper Feed Sensor
S335th Transport Sensor
S366th Paper Feed Sensor
S496th Transport Sensor
S50LCT Exit Sensor
S49
M12
S20
M9
S36
M1
S4
M3
Tray 4
M7
Tray 5
M11
Tray 6
5. Electrical component summary
Motors
No.
(Signal)
M1
(L1REVM)
M2
(L1PRM)
M3
(L1PUM)
M4
(L1PFM)
M5
(L2REVM)
M6
(L2PRM)
M7
(L2PUM)
M8
(L2PFM)
M9
(L3REVM)
NameDescription
4th Grip MotorDrives the separation roller and the grip
4th Lift MotorDrives the bottom plate of the 4th tray up
4th Paper Feed
Motor
4th Transport
Motor
5th Grip MotorDrives the separation roller and the grip
5th Lift MotorDrives the bottom plate of the 5th tray up
5th Paper Feed
Motor
5th Transport
Motor
6th Grip MotorDrives the separation roller and the grip
roller of the 4th tray.
and down.
Drives the pick-roller and feed roller that
picks up each sheet and starts to feed it
out of the 4th tray.
Drives the rollers in the vertical feed path
that feed the paper from the 4th tray to the
LCT exit motor.
roller of the 5th tray.
and down.
Drives the pick-roller and feed roller that
picks up each sheet and starts to feed it
out of the 5th tray.
Drives the transport rollers in the vertical
feed path that feed the paper from the 4th
tray and the 5th tray to the LCT exit motor.
roller of the 6th tray.
Tray 7
(MX-MFX2)
Motors
No.
(Signal)
M10
(L3PRM)
M11
(L3PUM)
M12
(L3PFM)
M13
(PEM)
PCBs
No.NameDescription
PCB1Main Control
Sensors
No.
(Signal)
S1
(L1ULS)
S2
(L1PES)
S3
(L1PFS)
S4
(L1PVS1)
S5
(L1PVS2)
S6
(L1PVS3)
S7
(L1PVS4)
S12
(L1SIZ1)
S13
(L1SIZ2)
S14
(L1SIZ3)
S15
(L1IDS)
S17
(L1TS)
S18
(L2ULS)
S19
(L2PES)
S20
(L2PFS)
S21
(L2PVS1)
S22
(L2PVS2)
S23
(L2PVS3)
S24
(L2PVS4)
S29
(L2SIZ1)
S30
(L2SIZ2)
S31
(L2SIZ3)
S33
(L2TS)
NameDescription
6th Lift MotorDrives the 5th tray up and down.
6th Paper Feed
Motor
6th Transport
Motor
LCT Exit Motor Feeds the paper out the LCT and into the
Board
NameDescription
4th Lift SensorDetects when the paper in the 4th tray is at
4th Paper End
Sensor
4th Paper Feed
Sensor
4th Paper
Height Sensor 1
4th Paper
Height Sensor 2
4th Paper
Height Sensor 3
4th Paper
Height Sensor 4
4th Paper Size
Sensor 1
4th Paper Size
Sensor 2
4th Paper Size
Sensor 3
4th Relay
Sensor
4th Transport
Sensor
5th Lift SensorDetects when the paper in the 5th tray is at
5th Paper End
Sensor
5th Paper Feed
Sensor
5th Paper
Height Sensor 1
5th Paper
Height Sensor 2
5th Paper
Height Sensor 3
5th Paper
Height Sensor 4
5th Paper Size
Sensor 1
5th Paper Size
Sensor 2
5th Paper Size
Sensor 3
5th Transport
Sensor
Drives the pick-roller and feed roller that
picks up each sheet and starts to feed it
out of the 6th tray.
Drives the rollers in the vertical feed path
that feed the paper from the 6th tray to the
LCT exit motor.
entrance of the copier.
Controls the operation of all motors and
sensors in the LCT unit.
the correct height for paper feed and
switches the 4th lift motor off.
Detects when the last sheet feeds from the
4th tray.
Detects the paper when it arrives at the 4th
paper feed roller and checks for misfeeds.
4th from the bottom of the 4th tray, detects
stack height: 100%
5th from the bottom of the 4th tray, detects
stack height: 75%
6th from the bottom of the 4th tray, detects
stack height: 50%
4th from the bottom of the 4th tray, detects
stack height: 25% and signals near-end.
1 of a set of 3 sensors that detect the width
of the paper in the 4th tray.
1 of a set of 3 sensors that detect the width
of the paper in the 4th tray.
1 of a set of 3 sensors that detect the width
of the paper in the 4th tray.
Detects the leading and trailing edges of
the paper in the paper path near the
bottom of the 4th tray. Checks the timing of
the feed and signals a jam if the paper is
late or lags at this location.
Detects jams in the paper path where the
transport motor feeds the paper from the
4th tray.
the correct height for paper feed and
switches the 4th lift motor off.
Detects when the last sheet feeds from the
5th tray.
Detects the paper when it arrives at the 5th
paper feed roller and checks for misfeeds.
4th from the bottom of the 5th tray, detects
stack height: 100%
5th from the bottom of the 5th tray, detects
stack height: 75%
6th from the bottom of the 5th tray, detects
stack height: 50%
4th from the bottom of the 5th tray, detects
stack height: 25% and signals near-end.
1 of a set of 3 sensors that detect the width
of the paper in the 5th tray.
1 of a set of 3 sensors that detect the width
of the paper in the 5th tray.
1 of a set of 3 sensors that detect the width
of the paper in the 5th tray.
Detects jams in the paper path where the
transport motor feeds the paper from the
5th tray.
MX-LCX4 OVERALL MECHANICAL INFORMATION 5 – 3
Page 17
Sensors
No.
(Signal)
S34
NameDescription
6th Lift SensorDetects when the paper in the 6th tray is at
(L3ULS)
S35
S36
S37
S38
S39
S40
S45
S46
S47
S49
S50
6th Paper End
Sensor
6th Paper Feed
Sensor
6th Paper
Height Sensor 1
6th Paper
Height Sensor 2
6th Paper
Height Sensor 3
6th Paper
Height Sensor 4
6th Paper Size
Sensor 1
6th Paper Size
Sensor 2
6th Paper Size
Sensor 3
6th Transport
Sensor
LCT Exit
Sensor
(L3PES)
(L3PFS)
(L3PVS1)
(L3PVS2)
(L3PVS3)
(L3PVS4)
(L3SIZ1)
(L3SIZ2)
(L3SIZ3)
(L3TS)
(LEXIT)
A. Block diagram
the correct height for paper feed and
switches the 4th lift motor off.
Detects when the last sheet feeds from the
6th tray.
Detects the paper when it arrives at the 6th
paper feed roller and checks for misfeeds.
4th from the bottom of the 6th tray, detects
stack height: 100%
5th from the bottom of the 6th tray, detects
stack height: 75%
6th from the bottom of the 6th tray, detects
stack height: 50%
4th from the bottom of the 6th tray, detects
stack height: 25% and signals near-end.
1 of a set of 3 sensors that detect the width
of the paper in the 6th tray.
1 of a set of 3 sensors that detect the width
of the paper in the 6th tray.
1 of a set of 3 sensors that detect the width
of the paper in the 6th tray.
Detects jams in the paper path where the
transport motor feeds the paper from the
6th tray.
Detects jams at the exit of the LCT unit.
AC POWER LINE
DC POWER LINE
SIGNAL LINE
A4 LCTMulti Bypass Tray
Solenoids
No.
(Signal)
SOL1
(L1PUS)
SOL2
(L1REVS)
SOL3
(L2PUS)
SOL4
(L2REVS)
SOL5
(L3PUS)
SOL6
(L3REVS)
NameDescription
4th Pick-up
Solenoid
4th Separation
Solenoid
5th Pick-up
Solenoid
5th Separation
SOL
6th Pick-up
Solenoid
6th Separation
Solenoid
Engages/disengages rotation of the pickup roller in the 4th tray.
Controls up-down movement of the
separation roller in the 4th tray.
Engages/disengages rotation of the pickup roller in the 5th tray.
Controls up-down movement of the
separation roller in the 5th tray.
Engages/disengages rotation of the pickup roller in the 6th tray.
Controls up-down movement of the
separation roller in the 6th tray.
Switches
No.
(Signal)
SW1
(LILSW)
NameDescription
Door Safety
Switch
An interlock safety switch that detects
when the front door is opened and closed.
Other
No.NameDescription
H1, H2 Anti-Condensation
Heaters
Evaporates moisture around the trays in
the LCT (230V 18W). This is an option
Host
Equipment
Option
Heater
Paper Rise Motor
For 1st Tray
Reverse Motor
For 1st Tray
Pick-Up Motor
For 1st Tray
Paper Rise Motor
For 2nd Tray
Reverse Motor
For 2nd Tray
Pick-Up Motor
For 2nd Tray
Paper Rise Motor
For 3rd Tray
Reverse Motor
For 3rd Tray
Pick-Up Motor
For 3rd Tray
Reverse Solenoid
For 1st Tray
Pick-Up Solenoid
For 1st Tray
Reverse Solenoid
For 2nd Tray
Pick-Up Solenoid
For 2nd Tray
Reverse Solenoid
For 3rd Tray
Pick-Up Solenoid
For 3rd Tray
AC208V-AC240V
or AC85V-AC115V
M1
STM5
STM6
M2
STM7
STM8
M3
STM9
STM10
SOL1
SOL4
SOL2
SOL5
SOL3
SOL6
SIGNAL
DC24V
I/F PWB
14.7456MHz±1.875%
D/D
FU650
CP200
CP201
CP202
D/D
CP650
DC3.3V
SW1
Interlock SW
STM1
Exit Motor
Feed Motor
STM2
For 1st Tray
Feed Motor
For 2nd
STM3
Tray
Feed Motor
STM4
For 3rd Tray
Exit Sensor
Paper Feed Sensor x 3
Paper End Sensor x 3
Upper Limit Sensor x 3
Paper Volume Sensor
For 1st Tray x 4
Paper Volume Sensor
For 2nd Tray x 4
Paper Volume Sensor
For 3rd Tray x 4
Transport Sensor x 3
Intermediate Sensor
For 1st Tray
Connecting Unit Sensor
SIGNAL
DC5V
DC24V
I/F PWB
CP100
DC5V
Paper End Sensor
Length Sensor
Paper Volume Sensor x 2
Upper Limit Sensor
Lower Limit Sensor
Paper Feed Sensor
SOL1
Pick-Up Solenoid
Paper Rise Motor
M1
Reverse Motor
STM1
Pick-Up Motor
STM2
Feed Motor
STM3
MX-LCX4 OVERALL MECHANICAL INFORMATION 5 – 4
Page 18
B. Actual wiring chart
L
C
CN110(MOLEX 3.5)
Main unit
CN100
CN101
A4LCT: C4155350
A3LCT: C4185350
CN111(Mi II)CN112(Mi II)
DSR (Not used)
DTR (Not used)
CN150 MOLEX(W)
When 100V
A4LCT: C4155356
A3LCT: C4185356
When 200V (standard)
A4LCT:C4155351
CN900 CN901
A3LCT:C4185351
4
12
3
5
12 pin
15 pin
Shield
TXD (Main unit)
RXD (Main unit)
A4LCT: C4155355
A3LCT: C4185355
L(200V)
L(200V)
1
1
N
N
3
3
L(100V)
L(100V)
2
2
FG
6T pick-up SOL
SOL SOL
JCN
CN
6T pick-up SOL
4T pick-up SOL
4T reverse SOL
4T paper end sensor
4T paper feed sensor
CN130 (MI II)
6T reverse SOL
JCN
CN
CN CN CN
A4LCT/A3LCT
:B8325311
A4LCT/A3LCT
:B8325311
CN132(Mi II)
6T reverse SOL
4T upper limit sensor
6T paper feed sensor
CN
JCN
CN
6T paper feed sensor
heater
Option
dehumidifying
heater
Option
dehumidifying
6T paper end sensor
6T paper end sensor
2
1
2
1
2
1
2
1
Dehumidifying heater
(230V: 18W)
AX400012 x 2
Dehumidifying heater
(100V: 18W)
AX4000** x 2
A4LCT: B8325302
A3LCT: B8345322
A4LCT: B8325301
A3LCT: B8345320
6T upper limit sensor
6T upper limit sensor
interface harness provided
A4LCT: B8325330
A3LCT: B8345320
4T transport
sensor
5T transport
sensor
CN CN CN
CNCNCN
JCN JCN JCN
CNCNCN
A4LCT: B8325313
A3LCT: B8345305
CN135 (Mi II)
4T transport sensor
5T transport sensor
A4LCT
5T transport sensor
B8325306
CN151 (MOLEX(W)
6T transport
sensor
6T transport sensor
4Tfan1
Not installed
M
JCN
CN
Sensor
For A3LCT
PE sensor 4
Paper feed sensor 4
Remaining quantity sensor 4-1
Remaining quantity sensor 4-2
Size sensor 4-1
Size sensor 4-2
Upper limit sensor 4
4Tfan2
M
JCN
CN
Size sensor 4-3
CN101
JCN
CNCN
Not installed
4T size
detection 1
4T size
detection 2
CNCNCN
CN160 (miniMi II)
Sensor
4T size detection 1
4T size detection 2
5T pick-up SOL
5T reverse SOL
Size sensor 4-4
Size sensor 4-5
Paper length sensor 4
Tray lower limit sensor 4
4T size
detection 3
A3LCT: B8345330
A4LCT: B8325308
A3LCT: B8345302
Drawer not provided
4T size detection 3
5T paper feed sensor
CN131 (Mi Red)
CN101
JCN
CN115CN114
4T length
detection
4T remaining
B8345334(In the tray)
CNCNCNCN
JCN
Drawer CN (39P)
Drawer CN (39P)
JCN
A4LCT:
4T length detection
5T upper limit sensor
5T paper end sensor
Pick-up SOL
Lift M (+)
Lift M (-)
quantity detection 1
4T remaining
CN161 (miniMiII)
4T remaining quantity detection 1
Lift SW
Lift LED
Slide detection
CN100
A4LCT: B8325307
A3LCT: B8345324
CN113
quantity detection 2
4T remaining
quantity detection 3
4T remaining quantity detection 2
4T remaining quantity detection 3
LCT exit port sensor
CN139 (Mi II)
CN
4T remaining
quantity detection 4
CN
4T remaining
quantity detection 4
5T intermediate sensor
LCT exit port sensor
CN800
CN
M
4T reverse
Dotted line : Pulse
A4LCT: B8325300
A3LCT: B8345300
CN
M
4T transport
: Low active
: High active
: Signal flow
A4LCT: B8325312
A3LCT: B8345308
CN
JCN
CN
A4LCT/A3LCT
:B8325311
CN
CN
CN
CN
M
M
4T pick-up M
5T pick-up M
JCN
SOL SOL
4T pick-up SOL
JCN
4T reverse
CNCNCN
4T paper feed sensor
4T paper end sensor
4T upper limit sensor
CN
M
5T reverse
1.A3LCT only
2. Because it is common in A3LCT/A4LCT but the using component is different, the connection, too, is different.
3.˴˴˴˴˴˴˴:A4LCT only. A4LCT doesn't use drawer connector.
A4LCT: B8325300
A3LCT: B8345300
CN
M
5T transport
CN
CN
M
M
Exit port
6T pick-up
CN
JCN
SOL
5T pick-up SOL
A4LCT: B8325312
A3LCT: B8345308
CN
JCN
CN
A4LCT/A3LCT
:B8325311
CN
CNCNCN
JCN
SOL
5T reverse SOL
5T paper feed sensor
5T paper end sensor
A4LCT: B8325318
A3LCT: B8345323
5T upper limit sensor
A4LCT: C4155354
A3LCT: C4185354
CNCN
CNCN
A4LCT: B8325318
A3LCT: B8345322
CN
CN
LCT exit port sensor
5T intermediate sensor
CN
JCNJCN
JCN
CN
A4
:
CN
Interface Unit sensor
MX-LCX4 OVERALL MECHANICAL INFORMATION 5 – 5
Page 19
0
Interface Unit sensor
CN111
Manual feed I/F
Transport sensor
Connection detection
JCN
CN
Manual feed (PAVO)
CN116 (Red)
5Tfan1
Not installed
M
JCN
CN
LCT exit port sensor
0 (MiII)
CN
CN
CN
4LCT/A3LCT
C4155352
CN
5Tfan2
Not installed
M
JCN
CN
CN162 (miniMi II)
Sensor
4T lower tray lift M (+)
A4LCT: B8325310
A3LCT: B8345301
CN
JCN
M
5Tsize
detection 1
CNCNCN
Sensor
5T size detection 1
4T lower tray lift M (-)
5T lower tray lift M (+)
5T lower tray lift M (-)
CN133 (MiII)
CN
JCN
M
5Tsize
detection 2
5Tsize
5T size detection 2
6T lower tray lift M (+)
6T lower tray lift M (-)
Door open/close detection
CN
141
A4LCT: B8325310
A3LCT: B8345303
CN
JCN
M
5Tlength
detection 3
A3LCT: B8345332
B8345334(In the tray)
JCN
Drawer CN (39P)
Drawer CN (39P)
JCN
A3LCT: B8345303
A4LCT:
Drawer not provided
5T size detection 3
CN142
detection
5T remaining
quantity detection 1
5T remaining
quantity detection 2
CNCNCNCN
CN163 (miniMi II)
5T length detection
5T remaining quantity detection 1
5T remaining quantity detection 2
CN154 MOLEX (W)
A4LCT: B8325300
A3LCT: B8345300
CN
CN
M
M
6Treverse
6T transport
5T remaining
quantity detection 3
5T remaining quantity detection 3
5T remaining
quantity detection 4
CN
5T remaining quantity detection 4
PWB
JCN
A4LCT
4T intermediate
lower sensor interface
harness provided
B8325305
Not connected
6Tfan1
6Tfan2
Not installed
Not installed
M
M
JCN
CN
CN
Sensor
Intermediate sensor 4 upper
CN730 (MiRed)CN710(MiII)
A4LCT: C4155354
A3LCT: B8345306
CNCN
JCNJCN
CNCN
A4LCT: B8325302
A3LCT: B8345321
CNCNCN
6Tsize
detection 1
CNCNCN
CN164 (miniMi II)
Sensor
6T size detection 1
Intermediate sensor 4 lower
Intermediate sensor 6T
A4LCT: -
A3LCT: B8345325
6Tsize
detection 2
6Tsize
detection 3
6T length
detection
6T remaining
quantity detection 1
6T remaining
quantity detection 2
6T remaining
quantity detection 3
6T remaining
quantity detection 4
A3LCT: B8345330
B8345334(In the tray)
JCN
Drawer CN (39P)
Drawer CN (39P)
JCN
A4LCT: B8325310
A3LCT: B8345304
CNCNCNCN
CN
CN165 (miniMi II)
A4LCT:
Drawer not provided
6T size detection 2
6T size detection 3
6T length detection
quantity detection 1
quantity detection 2
quantity detection 3
6T remaining
4Tsizedetection3
quantity detection 4
6T remaining
6T remaining
6T remaining
For A4LCTFor A4LCT
4T size detection 1
4T size detection 2
CN160 (miniMi II)
A4LCT: B8325308A4LCT: B8325309
CN
For A4LCT
5T size detection 1
CN162 (miniMiII)
CN164 (miniMiII)
5T size detection 2
CN
6Tsizedetection
CN
A4LCT: B8325310A4LCT: B8325309
6T size detection 1
6T size detection 2
6T size detection 3
5T size detection 3
4T tray lift
6T tray lift
5T tray lift
Door open/close SW
Intermediate sensor 6T
Intermediate sensor 4Tupper
Intermediate sensor 4T lower
4Tsizedetection
5Tsizedetection
MX-LCX4 OVERALL MECHANICAL INFORMATION 5 – 6
Page 20
Memo
Page 21
Memo
Page 22
LEAD-FREE SOLDER
The PWB’s of this model employs lead-free solder. The “LF” marks indicated on the PWB’s and the Service Manual mean “Lead-Free” solder.
The alphabet following the LF mark shows the kind of lead-free solder.
Example:
<Solder composition code of lead-free solder>
Solder composition
Sn-Ag-Cu
Sn-Ag-Bi
Sn-Ag-Bi-Cu
Sn-Zn-Bi
Sn-In-Ag-Bi
Sn-Cu-Ni
Sn-Ag-Sb
Bi-Sn-Ag-P
Bi-Sn-Ag
5mm
Lead-Free
Solder composition
code (Refer to the
table at the right.)
a
(1) NOTE FOR THE USE OF LEAD-FREE SOLDER THREAD
When repairing a lead-free solder PWB, use lead-free solder thread.
Never use conventional lead solder thread, which may cause a breakdown or an accident.
Since the melting point of lead-free solder thread is about 40°C higher than that of conventional lead solder thread, the use of the
exclusive-use soldering iron is recommended.
Solder composition code
a
b
z
i
n
s
p
(2) NOTE FOR SOLDERING WORK
Since the melting point of lead-free solder is about 220°C, which is about 40°C higher than that of conventional lead solder, and its soldering
capacity is inferior to conventional one, it is apt to keep the soldering iron in contact with the PWB for longer time. This may cause land
separation or may exceed the heat-resistive temperature of components. Use enough care to separate the soldering iron from the PWB when
completion of soldering is confirmed.
Since lead-free solder includes a greater quantity of tin, the iron tip may corrode easily. Turn ON/OFF the soldering iron power frequently.
If different-kind solder remains on the soldering iron tip, it is melted together with lead-free solder. To avoid this, clean the soldering iron
tip after completion of soldering work.
If the soldering iron tip is discolored black during soldering work, clean and file the tip with steel wool or a fine filer.