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.
MX-LCX5
[1]SPECIFICATIONS
FormLarge Capacity Trays (3 Trays)
Transport speed85 – 110 sheets/minute to be supported
Transport standardCenter alignment
Paper sizeAuto-AB: A3W, A4W, A3, B4, A4, A4R*, B5, B5R, A5R, 8.5 x 13*
Paper size labelAvailable
Paper size settingUpper tray: User settings
Paper size setting for shipmentInch: 11 x 17
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 / Lower tray: 9 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
DimensionsW 878 x D 729 x H 980 mm
Occupied dimensionW 880 x D 730
WeightApproximately 175 kg
Installation/Maintenance By service person
HeaterAC 18W x 2 36W (By service parts: 0PQC4180431//)
Auto-Inch: 12 x 18, 11 x 17, 9 x 12, 8.5 x 14*, 8.5 x 13.4*, 8.5 x 11, 8.5 x 11R*, 7.25 x 10.5R, 5.5 x 8.5R
Manual: 318 x 469.5 mm, 318 x 234.75 mm, 312.5 x 440 mm, 312.5 x 220 mm
SRA3 (320 x 450 mm), SRA4 (320 x 225 mm) 8K, 16K, 16KR, Postcard
Custom Size: Main scanning: 100 – 320 mm (4.0 – 12.5)
*: As automatic detection, 8.5 x 11R/8.5 x 14/8.5 x 13.4 and A4R/8.5 x 13/8.5 x 13.4 is exclusion. Refer to the attached table.
Middle tray: User settings
Lower tray: User settings
Middle tray: 24 seconds or less
Time required from tray insertion to empty detection without paper
Service Manual
MX-LCX5 SPECIFICATIONS 1 – 1
Paper Size/Type/Weight
LCT(A3)
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
(170 lbs index)
(100 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 432YesYesYes
Ledger (11" x 17") Z folding279 x 216———
Legal (8.5" x 14")216 x 356YesYesYes
Legal (8.5" x 14") Z folding216 x 178———
Mexican Legal (8.5" x 13.4")216 x 340YesYesYes
Foolscap (8.5" x 13")216 x 330YesYesYes
Letter (8.5" x 11")279 x 216YesYesYes
Letter R (8.5" x 11" R)216 x 279YesYesYes
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 266YesYesYes
9 x 12 (A4W)305 x 229YesYesYes
A3297 x 420YesYesYes
A3 Z folding297 x 210———
B4257 x 364YesYesYes
B4 Z folding257 x 182———
A4297 x 210YesYesYes
A4-R210 x 297YesYesYes
A4-R Z folding210 x 148———
B5257 x 182YesYesYes
B5-R182 x 257YesYesYes
A5210 x 148———
A5-R148 x 210YesYesYes
SRA3320 x 450 mmYesYesYes
SRA4320 x 225 mmYesYesYes
318 x 234.75 mmYesYesYes
312.5 x 220 mmYesYesYes
318 x 469.5 mmYesYesYes
312.5 x 440 mmYesYesYes
8K270 x 390YesYesYes
16K270 x 195YesYesYes
16K-R195 x 270YesYesYes
Postcard100 x 148YesYesYes
Special – Custom size
Custom Range
min Main100 (4.0)100 (4.0)100 (4.0)
YesYesYes
max Main320 (12.5)320 (12.5)320 (12.5)
min Sub140 (5.5)140 (5.5)140 (5.5)
max Sub470 (18.5)470 (18.5)470 (18.5)
Special – Size uncertainNoNoNo
2
52 g/m
(14 lbs bond)
2
300 g/m
(40 lbs bond)
Ye s
is possible)
52 g/m
(14 lbs bond)
205 g/m
(40 lbs bond)
(110 lbs index)
(65 lbs cover)
2
(Even 52 g/m
is possible)
Yes
2
2
2
MX-LCX5 SPECIFICATIONS 1 – 2
MX-LCX5
[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-LCX5 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-LCX5 MAINTENANCE 2 – 1
MX-LCX5
[3]REPLACEMENT AND
ADJUSTMENT
1. Removing trays
CAUTION:
• Tray 5 weighs 27 kg (60 lb.) empty. Trays 4 and 6 weigh 20 kg
(44 lb.) each empty.
• To prevent damage to the tray and personal injury, never attempt
to lift a tray alone or without attaching the carrying handles, especially if a tray is loaded with paper.
• Two people on each side of the tray should lift the carrying handles together to lift and move the tray.
• Never remove the tray if the LCT has not been docked to the
copier. Removing the tray while the LCT is standing alone can
unbalance the LCT and cause it to fall over.
Important:
Only one set of carrying handles is attached to the side of Tray 5.
Follow the procedure below to attach and use these handles to
move Tray 4, 5, or 6.
Service Manual
(2)
(1)
4) Remove carrying handles [A] and [B] from the right side of the
tray (screw x 2 ea.)
5) Use the same screws to attach the carrying handles at (1) and
(2).
6) With one person on each side of the tray, lift it carefully and
remove it from the rails.
2. Front door and covers
1) Pull the tray [A] out of the LCT until it stops.
2) Remove the screws from the right rail [B] (screw x 3)
3) Remove the screws from the left rail [D] (screw x 3)
NOTE: You do not need to remove the screw for the stopper
pin bracket at the back of the left rail.
[A]
[B]
[F]
[E]
Important:
• The frame is held together by 8 blue screws.
• To avoid weakening or warping the shape of the frame, never
remove these blue screws.
NOTE: The upper inner cover must be removed before the top
cover.
Remove:
[A] Right cover (screw x 6)
[B] Right rear cover (screw x 6)
[C] Left rear cover (screw x 6)
[D] Top cover (screw x 5)
[E] Front door (stopper x 1)
NOTE: While lifting the top cover, remove the snap ring and front
door.
[F] Paper slot cover (screw x 2)
[D]
[C]
[B]
[A]
MX-LCX5 REPLACEMENT AND ADJUSTMENT 3 – 1
3. Inner cover, paper feed unit
[A]
[B]
[
C]
[A]
[E]
[
C]
[D]
[B]
4. Paper feed roller
Remove:
• Remove the right cover (see 2.)
• Remove the paper trays. (see 1.)
[A] Pick-up roller (stopper x 1)
[B] Feed roller (stopper x 1)
[C] Separation roller (stopper x 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 oppositedirections. 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).
• Open the front door.
• Remove right cover (see 2.)
• Pull out tray [A]
Remove:
[A] Tray (see 1.)
[B] Knobs (x 3) (screw x 1 ea.)
[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)
[F]
5. LCT motors
A. Transport motors, LCT exit motor
[B]
[A]
(1)
(2)
(3)
MX-LCX5 REPLACEMENT AND ADJUSTMENT 3 – 2
[D]
[C]
(4)
Each paper feed unit has a pick-up feed motor (1) and a grip motor
(2). The removal procedure is the same for each feed tray.
1) Remove the left rear cover (see 2.)
2) Use a small screwdriver to turn the shaft [A] so the pin can slip
out of the keyhole.
Remove:
[B] Motor unit (screw x 4, clamp x 2, connector x 2)
• Attach the tension spring, then tighten the screws (3) to tighten
the belts.
C. Lift motors
4th, 5th, and 6th Transport Motors (1), (2), (3)
Remove:
• Left rear cover (see 2.)
[A] Motor unit (connector x 1, Timing belt x 1, screw x 2)
[B] Motor (screw x 2)
LCT Exit Motor (4)
Remove:
• Left rear cover (see 2.)
[C] Motor unit (connector x 1, Timing belt x 1, screw x 3)
[D] Motor (screw x 2)
B. Feed motors/grip motors
[B]
(1)
(2)
[A]
[B]
[C]
[E]
[A]
[D]
(2)
(1)
4th, 6th Lift Motors
The procedure for removing the 4th and 6th lift motors is the same.
[C]
MX-LCX5 REPLACEMENT AND ADJUSTMENT 3 – 3
Remove:
• Rear cover. (see 2.)
[A] Motor unit (screw x 2, connector x 1)
[B] 4th (or 6th) lift motor (screw x 4, Clip x 1, Coupling x 1, Spring x
1)
5th Lift Motor
• Rear cover. (see 2.)
[C] Motor unit (screw x 4, connector x 1)
[D] 5th lift motor (screw x 2, Clip x 1, Coupling x 1, Spring x 1)
[D]
6. LCT exit sensor
[A]
1) Disconnect the harness clamps (1) and (2) (clamp x 2).
2) Disconnect the motor harnesses (3), (4), (5) (clamp x 3, con-
nector x 11).
[A]
[B]
[B]
• Disconnect the LCT from the copier.
[A] Exit sensor unit (screw x 1, connector x 1)
[B] Exit sensor
7. Paper path sensors
A. Removing the vertical feed unit
(1)
(2)
(3)
C]
[
3) Remove:
[A] Upper stay (screw x 2)
[B] Lower stay (screw x 2)
[C] Vertical feed unit (screw x 6)
B. 4th transport, 4th relay upper, lower sensors
(4)
(5)
• Open the front door.
Remove:
• Upper inner cover (see 3.)
• Lower inner cover (see 3.)
• Left rear cover (see 2.)
[B]
1) Remove the vertical feed unit. (see A.)
2) Remove:
[A] 4th Transport sensor (screw x 1, connector x 1)
[B] 4th Relay sensor – upper (screw x 1, connector x 1)
[C] 4th Relay sensor – lower (screw x 1, connector x 1)
MX-LCX5 REPLACEMENT AND ADJUSTMENT 3 – 4
[A]
[C]
C. 5th relay sensor, 5th transport sensor
[A]
9. Paper height, paper width sensors
[C]
[A]
[B]
[B]
1) Remove the vertical feed unit. (see A.)
2) Remove:
[A] 5th Relay sensor (screw x 1, connector x 1)
[B] 5th Transport sensor (screw x 1, connector x 1)
D. 6th relay sensor, 6th transport sensor
[A]
[B]
• Remove the vertical feed unit. (see A.)
[A] 6th Relay sensor (screw x 1, connector x 1)
[B] 6th Transport sensor (screw x 1, connector x 1)
[
D]
[E]
Paper Height Sensors
Remove:
• Rear left cover. (see 2.)
[A] Paper height sensor unit (screw x 2, connector x 4).
[B] Clamp bracket (screw x 2)
[C] Paper height sensors (x 4) (Hooks x 2 each)
Paper Width Sensors
• Rear left cover. (see 2.)
[D] Paper width sensor unit (screw x 2, connector x 3)
[E] Paper width sensors (x 3) (Hooks x 2 each)
8. Main control board
[A]
• Remove the rear covers. (see 2.)
[A] Main control board (screw x 6, Standoffs x 2, connector x All).
MX-LCX5 REPLACEMENT AND ADJUSTMENT 3 – 5
10. 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
as shown.
[A] Image position sensor unit (screw x 2, connector x 1)
[B] Stopper (screw x 1)
[C] Image position sensor
• After replacing the image position sensor do the procedure for
image position sensor adjustment. (see 12.)
Image Position Sensor Board
• Disconnect the LCT from the copier.
[D] Cover (screw x 2, clamp x 2)
[E] Image position sensor board (screw x 2, connector x 2, clamp x
2)
[B]
[A]
[C]
Clamp (x 2)
Interface harness
(with heater line)
B. Installing procedures
1) Remove the lower-stage cassette. (6 screws)
2) Remove the rear cabinet. (6 screws)
MX-LCX5 REPLACEMENT AND ADJUSTMENT 3 – 6
3) Remove the interface harness plate (2 screws), and remove
the harness.
5) 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.
Screw (x 2)
Interface harness
4) Install two heaters with two screws fro each of them.
Interface
harness
Heater harness
section
Snap band fixing
Earth fixing screw
Attach the clamp.
Snap band fixing
Clamp (2 positions)
MX-LCX5 REPLACEMENT AND ADJUSTMENT 3 – 7
Fix the harness
with the clamp.
Snap band fixing
7) Install the rear cabinet, and fix it with the fixing screw.
6) Install the heater cover. (3 screws)
Connect the heater
and the harness.
MX-LCX5 REPLACEMENT AND ADJUSTMENT 3 – 8
MX-LCX5
[4]DETAILED DESCRIPTIONS
1. Paper feed
A. Paper feed rollers
[B]
[D]
[A]
[C]
This LCT has three paper tray feed stations:
The 4th and 6th tray each hold 1,000 sheets of paper. The 5th tray
holds 2,000 sheets of paper. Total: 4,000 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
[B]
[D]
[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].
[C]
[A]
C. Paper separation
Service Manual
[D]
[C]
E]
[
[G]
[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.
[F]
[B]
MX-LCX5 DETAILED DESCRIPTIONS 4 – 1
2. Paper detection/lift
1
2
3
4
A. Mechanism
[D]
[F]
[H]
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
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
[E]
[I]
[G]
[A]
[C]
[B]
Detection
When the tray set in the machine, the tray is detected by the drawer
connector on the back side of the tray.
Lift
When the machine detects that the paper tray is set in the machine:
• The tray lift motor [A] rotates forward
• Coupling gear [B] on the tray lift motor engages pin [C] of the lift
drive shaft.
• The tray drive belts [D], connected to the tray bottom plate [E],
are driven by the tray lift motor via the lift drive shaft and tray lift
pulleys [F].
• When the lift motor rotates forward, the tray bottom plate [E]
rises. The tray rises 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 [G] on the rear end of the bottom plate activates the paper height sensors [H], the remaining paper capacity
is detected.
When the tray is pulled out:
• Coupling gear [B] separates from pin [C] and the tray bottom
plate goes down.
• A damper [I] slows the descent of the bottom plate. For the B834,
all three trays have this damper.
B. Lift sensor
[A]
[E]
[D]
[B]
[C]
1) 4th Paper Width Sensor 3
2) 4th Paper Width Sensor 2
3) 4th Paper Width Sensor 1
4) 4th Paper Length Sensor
The 4th, 5th, and 6th trays have three paper width sensors and one
paper length sensor. The illustration above shows how these sensors are arranged in the 4th tray.
This table describes how the three width sensors and one length
sensor are used to determine the paper size in the 4th, 5th, and 6th
paper trays.
Paper Size
Large
Size
A3 SEF297 x 420 mmLLHHYES YES
A4 LEF297 x 210 mm LLHLYES YES
DLT SEF 11" x 17"LHLHYES YES
LT LEF11" x 8 1/2" LHLLYES YES
B4 SEF257 x 364 mmLHHHYES YES
B5 LEF257 x 182 mmLHHLYES YES
A4 SEF210 x 297 mm HLLHNOYES
LT SEF8 1/2" x 11" HLLHYESNO
A5 LEF210 x 148 mmHLLLNO YES
HLT LEF 8 1/2" x 5 1/2" HLLLYESNO
B5 SEF182 x 257 mm HLHHNONO
F SEF8" x 13" HLHHYES YES
A5 SEF148 x 210 mmHHLLYES YES
HLT SEF 5 1/2" x 8 1/2" HHHLYES YES
12" x 18" LLLHYES YES
13" x 19"NONO
320 x 450 mmNONO
Width Sensors
W1W2W3L1NAEU
Length
Sensor
Area
YES: Detected automatically
NO: Not detected automatically. Requires size setting change with
the "Tray Paper Setting" key on the copier operation panel to detect
the desired paper size.
H: Sensor OFF
L: Sensor ON
MX-LCX5 DETAILED DESCRIPTIONS 4 – 2
4. Remaining paper detection
[A]
[B]
[E]
[D]
[C]
[B]
[A]
[A] Paper Height Sensor Actuator
[B] 4th Paper Height Sensor 4
[C] 4th Paper Height Sensor 3
[D] 4th Paper Height Sensor 2
[E] 4th Paper Height Sensor 1 (Near End)
Each tray has four paper height sensors. The illustration above
shows the paper height sensors in the 4th tray. This arrangement is
duplicated in the 5th and 6th trays.
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
[A] are possible.
1) With the actuator [A] below paper height sensor 4 [B], no sen-
sor is actuated and the display indicates 100%.
2) When the actuator passes paper height sensor 4 [B] , the dis-
play indicates 70% of the paper supply remaining.
3) When the actuator passes paper height sensor 3 [C], the dis-
play indicates 30% of the paper supply remaining.
4) When the actuator passes paper height sensor 2 [D], the dis-
play indicates 10% 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.
5. Paper end detection
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-LCX5 DETAILED DESCRIPTIONS 4 – 3
M13
M3
M1
M4
M2
M6
M10
M11
M9
M12
M7
M5
M8
MX-LCX5
[5]OVERALL MECHANICAL
INFORMATION
1. Mechanical component layout
11
(1)
2. Drive layout
Service Manual
4
10
(2)
5
9
8
7
(3)
14th Paper Feed Unit*1
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
*1: Each feed unit has 1 paper feed motor that drives the pick-up
roller and paper feed roller, and 1 grip motor that drives the separation roller and grip roller.
6
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-LCX5 OVERALL MECHANICAL INFORMATION 5 – 1
3. Electrical components
M11
M10
2 (Option:
0PQC4180431//)
M9
M12
M13
M8
M4
M1
M3
M5
M7
M2
1
M6
S15
S50
SOL5
S34
S36
S44th Paper Height Sensor 1
S54th Paper Height Sensor 2
S64th Paper Height Sensor 3
S74th Paper Height Sensor 4
S84th Paper Length Sensor
S94th Paper Width Sensor 1
S104th Paper Width Sensor 2
S114th Paper Width Sensor 3
S154th Relay Sensor
S164th Relay Sensor - Upper
S174th Transport Sensor
S215th Paper Height Sensor 1
S225th Paper Height Sensor 2
S235th Paper Height Sensor 3
S245th Paper Height Sensor 4
S255th Paper Length Sensor
S265th Paper Width Sensor 1
S275th Paper Width Sensor 2
S285th Paper Width Sensor 3
S325th Relay Sensor
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
S416th Paper Length Sensor
S426th Paper Width Sensor 1
S436th Paper Width Sensor 2
S446th Paper Width Sensor 3
S486th Relay Sensor
S496th Transport Sensor
S50LCT Exit Sensor
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
S28
S8
S23
S22
S21
S43
S25
S42
S40
S39
S41
MX-LCX5 OVERALL MECHANICAL INFORMATION 5 – 2
4. A3/DLT LCT MX-LCX5 layout (with
bypass)
M3
M4
S8
S17
M1
M3
S3
M4
M13
S50
S15
S32
S16
S33
M8
M5
S20
S48
M12
M9
M11
S49
S36
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 – Lower
S164th Relay Sensor – Upper
S174th Transport Sensor
S205th Paper Feed Sensor
S325th Relay Sensor
S335th Transport Sensor
S366th Paper Feed Sensor
S486th Relay Sensor
S496th Transport Sensor
S50LCT Exit Sensor
M1
S4
Tray 4
M7
Tray 5
Tray 6
Tray 7
(MX-MFX2)
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)
M10
(L3PRM)
M11
(L3PUM)
M12
(L3PFM)
M13
(PEM)
PCBs
No.NameDescription
PCB1Main Control
NameDescription
4th Grip MotorDrives the separation roller and the grip
4th Lift MotorDrives the bottom plate of the 4th tray
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
5th Paper Feed
Motor
5th Transport
Motor
6th Grip MotorDrives the separation roller and the grip
6th Lift MotorDrives the 5th tray up and down.
6th Paper Feed
Motor
6th Transport
Motor
LCT Exit MotorFeeds the paper out the LCT and into
Board
roller of the 4th tray.
up 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.
up 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.
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.
the entrance of the copier.
Controls the operation of all motors and
sensors in the LCT unit.
MX-LCX5 OVERALL MECHANICAL INFORMATION 5 – 3
Sensors
No.
(Signal)
S1
(L1ULS)
S2
(L1PES)
S3
(L1PFS)
S4
(L1PVS1)
S5
(L1PVS2)
S6
(L1PVS3)
S7
(L1PVS4)
S8 (L1LS) 4th Paper Length
S9
(L1SIZ1)
S10
(L1SIZ2)
S11
(L1SIZ3)
S15
(L1IDS)
S16
(L1IUS)
S17
(L1TS)
S18
(L2ULS)
S19
(L2PES)
S20
(L2PFS)
S21
(L2PVS1)
S22
(L2PVS2)
S23
(L2PVS3)
S24
(L2PVS4)
S25
(L2LS)
S26
(L2SIZ1)
S27
(L2SIZ2)
S28
(L2SIZ3)
S32
(L2IUS)
S33
(L2TS)
NameDescription
4th Lift SensorDetects when the paper in the 4th tray
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
Sensor
4th Paper Width
Sensor 1
4th Paper Width
Sensor 2
4th Paper Width
Sensor 3
4th Relay SensorDetects the leading and trailing edges
4th Relay Sensor Upper
4th Transport
Sensor
5th Lift SensorDetects when the paper in the 5th tray
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 Length
Sensor
5th Paper Width
Sensor 1
5th Paper Width
Sensor 2
5th Paper Width
Sensor 3
5th Relay Sensor Detects the leading and trailing edges
5th Transport
Sensor
is at 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.
Detects the length of the paper in the
4th tray (used in combination with the
paper width sensors).
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.
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 the leading and trailing edges
of the paper in the paper path near the
top 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.
is at 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.
Detects the length of the paper in the
5th tray (used in combination with the
paper width sensors).
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.
of the paper in the paper path near the
5th 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 5th tray.
Sensors
No.
(Signal)
S34
(L3ULS)
S35
(L3PES)
S36
(L3PFS)
S37
(L3PVS1)
S38
(L3PVS2)
S39
(L3PVS3)
S40
(L3PVS4)
S41
(L3LS)
S42
(L3SIZ1)
S43
(L3SIZ2)
S44
(L3SIZ3)
S48
(L3IUS)
S49
(L3TS)
S50
(LEXIT)
NameDescription
6th Lift SensorDetects when the paper in the 6th tray
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 Length
Sensor
6th Paper Width
Sensor 1
6th Paper Width
Sensor 2
6th Paper Width
Sensor 3
6th Relay SensorDetects the leading and trailing edges
6th Transport
Sensor
LCT Exit SensorDetects jams at the exit of the LCT unit.
is at 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.
Detects the length of the paper in the
6th tray (used in combination with the
paper width sensors).
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.
of the paper in the paper path near the
6th 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 6th tray.
MX-LCX5 OVERALL MECHANICAL INFORMATION 5 – 4
Solenoids
No.
(Signal)
SOL1
(L1PUS)
SOL2
(L1REVS)
SOL3
(L2PUS)
SOL4
(L2REVS)
SOL5
(L3PUS)
SOL6
(L3REVS)
Switches
No.
(Signal)
SW1
(LILSW)
Other
No.NameDescription
H1, H2 Anti-Condensation
NameDescription
4th Pick-up
Solenoid
4th Separation
Solenoid
5th Pick-up
Solenoid
5th Separation
SOL
6th Pick-up
Solenoid
6th Separation
Solenoid
NameDescription
Door Safety
Switch
Heaters
Engages/disengages rotation of the
pick-up roller in the 4th tray.
Controls up-down movement of the
separation roller in the 4th tray.
Engages/disengages rotation of the
pick-up roller in the 5th tray.
Controls up-down movement of the
separation roller in the 5th tray.
Engages/disengages rotation of the
pick-up roller in the 6th tray.
Controls up-down movement of the
separation roller in the 6th tray.
An interlock safety switch that detects
when the front door is opened and
closed.
Evaporates moisture around the trays in
the LCT (230V 18W). This is an option
MX-LCX5 OVERALL MECHANICAL INFORMATION 5 – 5
A. Block diagram
AC POWER LINE
DC POWER LINE
SIGNAL LINE
A3 LCTMulti Bypass Tray
Host
Equipment
AC208V - AC240V
or AC85V - AC115V
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
STM5
STM6
STM10
M1
M2
STM7
STM8
M3
STM9
SOL1
SOL4
SOL2
SOL5
SOL3
SOL6
SIGNAL
DC24V
FU650
I/F PWB
D/D
CP200
CP201
CP203
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
Length Sensor x 3
Size Sensor For 1st
Trayx3
Paper Volume Sensor
For1stTrayx4
Size Sensor For 2nd
Trayx3
Paper Volume Sensor
For 2nd Tray x 4
Size Sensor For 3rd
Trayx3
Paper Volume Sensor
For3rdTrayx4
Transport Sensor x 3
Intermediate Upside
Sensor For 1st Tray
Intermediate Downside
Sensor For 1st Tray
Intermediate Sensor
For 2nd Tray
Intermediate Sensor
For 3rd 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
STM3
Feed Motor
MX-LCX5 OVERALL MECHANICAL INFORMATION 5 – 6
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
Option
dehumidifying
heater
6T paper end sensor
6T paper end sensor
2
1
2
1
2
1
2
1
Dehumidifying heater
(230V: 18W)
AX400012 x 2
A4LCT: B8325302
Dehumidifying heater
(100V: 18W)
AX4000** x 2
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
4T fan 1
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
4T fan 2
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 (-)
Lift SW
quantity detection 1
4T remaining
CN161 (miniMi II)
4T remaining quantity detection 1
Lift LED
Slide detection
CN100
CN
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)
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: B 8325312
A3LCT: B 8345308
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
SOL
5T pick-up SOL
A4LCT: B 8325312
A3LCT: B 8345308
CN
JCN
CN
A4LCT/A3LCT
:B8325311
CN
CNCNCN
JCN
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-LCX5 OVERALL MECHANICAL INFORMATION 5 – 7
I
t
f
U
it
CN111
JCN
Manual feed I/F
Transport sensor
Connection detection
CN
Manual feed (PAVO)
CN116 (Red)
5T fan 1
Not installed
M
JCN
CN
LCT exit port sensor
00 (Mi II)
CN
JCN
CN
4LCT/A3LCT
: C4155352
CN
sensor
n
ace
er
n
5T fan 2
Not installed
M
JCN
CN
CN162 (miniMi II)
Sensor
4T lower tray lift M (+)
A4LCT: B 8325310
A3LCT: B 8345301
CN
JCN
M
4T tray lift
5T size
detection 1
CNCNCN
Sensor
5T size detection 1
4T lower tray lift M (-)
5T lower tray lift M (+)
5T lower tray lift M (-)
CN133 (Mi II)
CN
JCN
M
5T tray lift
5T size
detection 2
5T size
5T size detection 2
6T lower tray lift M (+)
6T lower tray lift M (-)
Door open/close detection
CN
141
A4LCT: B 8325310
A3LCT: B 8345303
CN
JCN
M
6T tray lift
5T length
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
Door open/close SW
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
6T reverse
6T transport
5T remaining
quantity detection 3
5T remaining quantity detection 3
5T remaining
quantity detection 4
CN
5T remaining quantity detection 4
PWB
A4LCT
4T intermediate
lower sensor interface
harness provided
B8325305
Not connected
6T fan 1
6T fan 2
Not installed
Not installed
M
M
JCN
JCN
CN
CN
Sensor
Intermediate sensor 4 upper
CN730 (Mi Red)CN710 (Mi II)
A4LCT: C4155354
A3LCT: B8345306
CNCN
JCNJCN
CNCN
A4LCT: B8325302
A3LCT: B8345321
CNCNCN
Intermediate sensor 4T upper
6T size
detection 1
CNCNCN
CN164 (miniMi II)
Sensor
6T size detection 1
Intermediate sensor 4 lower
Intermediate sensor 6T
A4LCT: -
A3LCT: B8345325
Intermediate sensor 6T
Intermediate sensor 4T lower
6T size
detection 2
6T size
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
4T size detection 3
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
4T size detection
For A4LCT
5T size detection 1
CN162 (miniMi II)
CN164 (miniMi II)
5T size detection 2
CN
5T size detection
6T size detection
CN
A4LCT: B8325310A4LCT: B8325309
6T size detection 1
6T size detection 2
6T size detection 3
5T size detection 3
MX-LCX5 OVERALL MECHANICAL INFORMATION 5 – 8
Memo
Memo
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.