Sharp MX-LC15 Service Manual ▷ View online
MX-LC15 OPERATIONAL DESCRIPTIONS 4 – 1
MX-LC15
Service Manual
[4] OPERATIONAL DESCRIPTIONS
1. Electrical and mechanical main parts
Signal
name
Name
Type
Function/operation
LCCD
(LTOD)
(LTOD)
Connect detector
Transmission type
Detects connection to the main unit.
LCLD
(LCD)
(LCD)
Tray close detector
Transmission type
The tray insertion is detected.
LDD
Tray downer limit detector
Transmission type
The lower limit of the tray is detected.
LDSW
Door switch
Micro switch
Detects open/close of the upper door.
LLM
Lift motor
Brush motor
Lifts the paper feed table.
LLSW
Upper limit switch
Micro switch
Protects the paper feed unit from breakage due to lifting the tray too much.
LPED
Tray paper empty detector
Transmission type
Detects paper presence/empty on the paper tray.
LPFC
Paper feed clutch
Electromagnetic clutch
Controls ON/OFF of the paper feed roller.
LPFD
Paper pass detector
Transmission type
Detects paper transport.
LPFM
Paper feed motor
Brushless motor
Drives the paper feed, and the paper transport section.
LPFS
Paper feed solenoid
Electromagnetic solenoid
Presses the paper pickup roller onto paper.
LRE
Lift motor rotaly encoder sensor
Transmission type
The lift motor rotation is detected.
LTRC
Transport clutch
Electromagnetic clutch
Controls ON/OFF of the transport roller.
LUD
Tray upper limit sensor
Transmission type
Detects the paper upper limit position.
No.
Name
Function/operation
1
Paper pickup roller
Feeds paper to the paper feed roller.
2
Paper feed roller
Feeds paper to the paper transport section.
3
Transport roller (Drive)
Transports paper from the paper feed roller to the main unit.
4
Transport roller (Idle)
Applies a pressure to paper and the transport roller to provide a transport power of the transport roller to
paper.
paper.
5
Separation roller
Separates paper to prevent double feed.
LLM
LPFM
LDSW
LLSW
LPED
LUD
LPFD
LTRC
LPFS
LPFC
LCCD(LTOD)
LRE
LDD
LCLD
(LCD)
MX-LC15 OPERATIONAL DESCRIPTIONS 4 – 2
2. Lift Operation
When the power to the main unit is turned ON with the tray at a
midway position (that is, a position where both the upper limit sen-
sor (LUD) and tray downer limit detector (LDD) are OFF) or with the
tray at the lower limit position (where the tray downer limit detector
LDD is ON), the main unit issues a lift-up request and, in response,
the lift motor is turned ON to lift the tray.
midway position (that is, a position where both the upper limit sen-
sor (LUD) and tray downer limit detector (LDD) are OFF) or with the
tray at the lower limit position (where the tray downer limit detector
LDD is ON), the main unit issues a lift-up request and, in response,
the lift motor is turned ON to lift the tray.
If the tray paper empty detector (LPED) turns ON within 800
encoder pulses of the start of tray lift, the lift motor is temporarily
turned OFF to stop the tray, and then the paper feed solenoid is
turned ON to lower the pick roller. Subsequently, the lift motor is
turned ON, and the tray is lifted to and stopped at a position where
the upper limit sensor (LUD) is turned ON.
encoder pulses of the start of tray lift, the lift motor is temporarily
turned OFF to stop the tray, and then the paper feed solenoid is
turned ON to lower the pick roller. Subsequently, the lift motor is
turned ON, and the tray is lifted to and stopped at a position where
the upper limit sensor (LUD) is turned ON.
If the tray paper empty detector (LPED) does NOT turn ON within
800 pulses of the start of tray lift, the paper feed solenoid is turned
ON with the lift motor remaining ON, and the pick roller is lowered.
The lift motor stops when the tray reaches a position where the
upper limit sensor (LUD) is turned ON, and subsequently the paper
feed solenoid is turned OFF.
800 pulses of the start of tray lift, the paper feed solenoid is turned
ON with the lift motor remaining ON, and the pick roller is lowered.
The lift motor stops when the tray reaches a position where the
upper limit sensor (LUD) is turned ON, and subsequently the paper
feed solenoid is turned OFF.
Lift operation is not performed if the power to the main unit is turned
ON with the tray at a position where it can feed paper.
ON with the tray at a position where it can feed paper.
When the tray is drawn out, it lowers by its own weight.
Lift operation (where LPED turns ON within 800 encoder
pulses of the start of lift operation)
pulses of the start of lift operation)
Lift operation (where LPED does NOT turn ON within 800
encoder pulses of the start of lift operation)
encoder pulses of the start of lift operation)
3. Paper Feed Operation
Paper feed operation can be performed if the tray is stationary at a
position where it can feed paper (with the upper limit sensor (LUD)
being ON) and there is paper in the tray.
position where it can feed paper (with the upper limit sensor (LUD)
being ON) and there is paper in the tray.
When paper feed takes place, the paper feed motor (LPFM), the
transport clutch (LTRC), the paper feed clutch (LPFC), and the
paper feed solenoid (LPFS) operate with the following timings:
transport clutch (LTRC), the paper feed clutch (LPFC), and the
paper feed solenoid (LPFS) operate with the following timings:
When the transport clutch (LTRC) turns ON with the paper feed
motor (LPFM) is ON (rotating), the transport roller starts rotating.
When the paper feed clutch (LPFC) turns ON in this state, the
paper feed and paper pick up rollers start rotating.
motor (LPFM) is ON (rotating), the transport roller starts rotating.
When the paper feed clutch (LPFC) turns ON in this state, the
paper feed and paper pick up rollers start rotating.
When the paper feed solenoid (LPFS) turns ON, the paper pick up
roller is pushed down to press paper.
roller is pushed down to press paper.
Paper feed time chart
*1: Operation stops only if the main unit synchronization signal is
output.
When operation is stopped, the ON/OFF timing for each load is
delayed by the stoppage time because each timer is suspended
during the stoppage.
output.
When operation is stopped, the ON/OFF timing for each load is
delayed by the stoppage time because each timer is suspended
during the stoppage.
4. Paper empty detection
The tray paper empty detector (LPED) checks whether there is
paper in the tray when the tray is lifted and stopped at a position
where it can feed paper, as well as during paper feed operation.
paper in the tray when the tray is lifted and stopped at a position
where it can feed paper, as well as during paper feed operation.
Paper feed operation is stopped if the sensor detects no paper in
the tray during paper feed operation.
the tray during paper feed operation.
(lift motor output)
(Tray downer limit detector)
(upper limit sensor)
(Tray paper empty detector)
(solenoid)
(Lift motor rotaly encoder sensor)
200 msec
Within 800 pulses
LDD
LLM
LUD
LPED
LPFS
LRE
(lift motor output)
(Tray downer limit detector)
(upper limit sensor)
(Tray paper empty detector)
(solenoid)
(Lift motor rotaly encoder sensor)
LDD
LLM
LUD
LPED
LPFS
LRE
800
1
LCC Paper feed roller clutch
2
Take-up roller
3
Paper feed roller
4
LCC Paper feed solenoid
5
LCC Transport clutch
6
LCC Transport motor
7
LCC Lift-up motor
Start of job
Clearance-between-papers
control timer
Clearance-between-papers
control timer
PIC timer
Paper feed clutch
OFF timer
Start of 1st
paper feed
Start of 2nd
paper feed
Start of 3rd
paper feed
Paper feed clutch
OFF timer
PIC timer
Paper feed speed
LPFM
(paper feed
motor)
LPFD
(paper pass
detector)
LPFC
LTRC
(paper feed
clutch)
(transport
clutch)
TRC
(main unit
synchronization
signal)
LPFS
(paper feed
(paper feed
solenoid)
suspended
on
off
on
off
on
off
on
off
on
off
*1
1
2
3
4
5
6
7
MX-LC15 ELECTRICAL SECTION 5 – 1
MX-LC15
Service Manual
[5] ELECTRICAL SECTION
1. Block diagram
/RXD-LCC
/DSR-LCC
/TXD-LCC
RES-LCC
GND2
+5V
+24V
GND1
AC-L
AC-N
/TRC-LCC
/DTR-LCC
LLSW
/LPFM
/LPFM-CLK
LPFM-T
L24VM
LDSW
+5V
+24V
ᵭᶌᵋᶀᶍᵿᶐᶂᴾᶕᶐᶇᶒᶃᴾᶁᶇᶐᶁᶓᶇᶒ
LPFM
LLM
ᵫᵟᵧᵬᴾᵳᵬᵧᵲ
C
P
U（H8/3687HV
）
EEPROM
LCC MAIN PWB
MX-LC15
ᵥᶐᶍᶓᶌᶂ
ᵦᶃᵿᶒᶃᶐ
GND2
ᵧᶌᶎᶓᶒᴾᶀᶓᶄᶄᶃᶐ
ᵧᶌᶎᶓᶒᴾᶀᶓᶄᶄᶃᶐ
ᵧᶌᶎᶓᶒᴾᶀᶓᶄᶄᶃᶐ
ᵭᶓᶒᶎᶓᶒᴾᶀᶓᶄᶄᶃᶐ
ᵧᶌᶎᶓᶒᴾᶀᶓᶄᶄᶃᶐ
ᵭᶓᶒᶎᶓᶒᴾᶀᶓᶄᶄᶃᶐ
Xtal
7.37MHz
LUD
LDD
LPED
LPFD
LTOD
LCD
LRE
LTRC
LPFC
LPFS
LLSW
LDSW
+24V
+24V
ᵪᵡᵡᴾᶎᵿᶎᶃᶐᴾᶄᶃᶃᶂᴾᶑᶍᶊᶃᶌᶍᶇᶂ
+24V
ᵪᵡᵡᴾᶒᶐᵿᶌᶑᶎᶍᶐᶒᴾᶁᶊᶓᶒᶁᶆ
ᵪᵡᵡᴾᶎᵿᶎᶃᶐᴾᶄᶃᶃᶂᴾᶁᶊᶓᶒᶁᶆ
ᵲᶐᵿᶗᴾᶓᶎᶎᶃᶐᴾᶊᶇᶋᶇᶒᴾᶑᶃᶌᶑᶍᶐ
+5V
ᵲᶐᵿᶗᴾᶊᶍᶕᶃᶐᴾᶊᶇᶋᶇᶒᴾᶑᶃᶌᶑᶍᶐ
+5V
ᵲᶐᵿᶗᴾᶎᵿᶎᶃᶐᴾᶃᶋᶎᶒᶗᴾᶑᶃᶌᶑᶍᶐ
+5V
ᵮᵿᶎᶃᶐᴾᶎᵿᶑᶑᴾᶑᶃᶌᶑᶍᶐ
+5V
ᵫᵿᶇᶌᴾᶓᶌᶇᶒᴾᶁᶍᶌᶌᶃᶁᶒᶇᶍᶌᴾᶑᶃᶌᶑᶍᶐ
+5V
ᵲᶐᵿᶗᴾᶁᶊᶍᶑᶃᴾᶑᶃᶌᶑᶍᶐ
+5V
ᵪᶇᶄᶒᴾᶋᶍᶒᶍᶐᴾᶃᶌᶁᶍᶂᶃᶐᴾᶑᶃᶌᶑᶍᶐ
+5V
ᵳᶎᶎᶃᶐᴾᶂᶍᶍᶐᴾᶊᵿᶒᶁᶆᴾᶑᶕᶇᶒᶁᶆ
ᵪᵡᵡᴾᶎᵿᶎᶃᶐᴾᶄᶃᶃᶂᴾᶋᶍᶒᶍᶐ
ᵳᶎᶎᶃᶐᴾᶊᶇᶋᶇᶒᴾᶑᶕᶇᶒᶁᶆ
ᵪᵡᵡᴾᶊᶇᶄᶒᴾᶋᶍᶒᶍᶐ
(TD62003APG)
ᵲᶐᵿᶌᶑᶇᶑᶒᶍᶐᴾᵿᶐᶐᵿᶗ
+24V
ᵳᶎᶎᶃᶐᴾᶊᶇᶋᶇᶒᴾᶋᶍᶌᶇᶒᶍᶐᶇᶌᶅᴾᶁᶇᶐᶁᶓᶇᶒ
ᵱᶃᶌᶑᶍᶐᴾᶇᶌᶎᶓᶒᴾᶁᶇᶐᶁᶓᶇᶒ
ᵡᶓᶐᶐᶃᶌᶒᴾᶁᶍᶌᶒᶐᶍᶊᴾᶁᶇᶐᶁᶓᶇᶒ
ᵮᶍᶊᶗᴾᶑᶕᶇᶒᶁᶆᴾᵏᵌᵏᵟ
ᵪᶇᶄᶒᴾᶋᶍᶒᶍᶐᴾᶂᶐᶇᶔᶃᴾᶁᶇᶐᶁᶓᶇᶒ
ᵳᶎᶎᶃᶐᴾᶂᶍᶍᶐ
ᴾᶋᶍᶌᶇᶒᶍᶐᶇᶌᶅᴾᶁᶇᶐᶁᶓᶇᶒ
ᵐᵒ
ᵴᴾᶋᶍᶌᶇᶒᶍᶐᶇᶌᶅᴾᶁᶇᶐᶁᶓᶇᶒ
MX-LC15 ELECTRICAL SECTION 5 – 2
2. Actual wiring diagram
A
A
B
B
C
C
D
D
E
E
4
4
3
3
2
2
1
1
LLM
LRE
ᵪᵰᵣ
+5V
1
GND2
ᵪᶇᶄᶒᴾᶋᶍᶒᶍᶐᴾᶃᶌᶁᶍᶂᶃᶐᴾᶑᶃᶌᶑᶍᶐ
ﾞﾞ
2
3
+5V
B8B-PH-K-S
CN-B
GND2
3
1
6
4
8
2
7
5
(/LTLS)
+24V
+5V
GND2
LRE
LDD
1
2
LLM
LLM (GND)
ᵪᵡᵡᴾᵟᵒ
N.C.
LCC MAIN PWB CR
+5V
LLM
5
GND2
6
9
N.C.
7
B14B-PHDSS-B
2
8
3
GND2
/LPFM-EN
LCD
4
LPFM-T
10
LLM (GND)
11
/LPFM-CLK
CN-E
1
N.C.
B12B-PHDSS-B
11
/DSR-LCC
RES-LCC
9
GND1
4
1
3
+5V
/TRC-LCC
5
2
CN-A
12
N.C.
7
/DTR-LCC
6
+24V
8
10
/RXD-LCC
GND2
/TXD-LCC
/TXD-LCC
+5V
LTOD
12
11
10
9
9
10
11
12
3
6
5
3
SMP-18V-NC
5
2
1
77
2
SMR-18V-N
8
2
1
3
4
6
8
1
4
1
2
2
1
2
1
GND2
1
5
4
/LPED
2
LPFM-T
+24V
GND1
LUD
ᵪᵮᵣᵢ
/LPFM-EN
/LPFM-CLK
2
LPFM
3
+5V
1
2
3
NC
1
+5V
3
PHR-5
1
/LTOD
ﾞﾞﾞ
3
3
2
1
LPFS
LLSW
ON
3
ᵲᶐᵿᶗᴾᶎᵿᶎᶃᶐᴾᶃᶋᶎᶒᶗᴾᶑᶃᶌᶑᶍᶐ
2
GND2
LPFC
1
13
6
3
11
12
8
9
ELP-15V
4
15
10
2
7
5
14
10
16
14
1
18
12
5
+5V
GND1
11
17
/LTRC
7
GND2
GND2
/LPFS
+24V
CN-C
+24V
15
+5V
4
13
/LTOD
20
22
9
B24-PHDSS-B
2
8
/LPED
+5V
23
+5VR
24
3
/LPFD
+5V
19
GND2
/LPFC
21
GND2
NC
3
2
1
LDSW
ON
15
16
17
18
13
14
13
14
15
16
17
18
＜
Paper feed unit
＞
11
2
2
33
2
1
3
4
5
6
4
5
6
+24V (L24VM)
+24V (LLSW)
GND2
GND2
CN-D
B10B-PHDSS-B
B10B-PHDSS-B
2
1
1
2
ᵦᶃᵿᶒᶃᶐᴾᵆᵐᵑᵎᵴᵍᵏᵎᵵᵇ
7
9
10
10
GND2
GND2
8
+24V (LDSW)
GND2
GND2
3
12
ELP-12V
5
ᵥᶐᶍᶓᶌᶂ
+5V
3
2
1
LCD
GND2
ELR-02V(RED)
1
3
ELP-03V
2
3
2
1
3
2
1
2
3
1
ELR-03V
SMP-03V-NC SMR-03V-N
SMR-03V-N
SMP-03V-NC
SMR-02V-N
SMP-02V-NC
SMR-03V-N
LDD
ᵪᵢᵢ
+5V
1
GND2
ᵲᶐᵿᶗᴾᶊᶍᶕᶃᶐᴾᶊᶇᶋᶇᶒᴾᶑᶃᶌᶑᶍᶐ
2
3
3
2
1
2
3
1
SMP-03V-NC SMR-03V-N
1
SMP-03V-NC
3
2
SMR-03V-N
2
1
3
GND2
1
3
+5VR
2
/LPFD
LPFD
1
2
1
2
ELR-04NV ELP-04NV
4
3
4
3
GND2
GND2
GND2
+5V
EXIN2
EXIN1
+24V (LLSW)
+24V (L24VM)
GND
B14B-PHDSS-B
11
9
/TXD LCC
4
3
5
+5V
2
CN-F
7
P85
6
RES LCC
8
10
/NMI
+5V
/RES LCC
/RES LCC
1
GND1
12
13
GND1
+24V )LOSW)
SMR-03V-N
3
2
1
2
1
3
Main unit
/LTRC
3
2
1
N.C.
LTRC
LUD
6
1
13
6
3
11
12
8
9
ELR-15V
4
15
10
2
7
5
14
3
12
ELR-12V
5
N.C.
N.C.
/TXD-LCC
/RXD-LCC
/DTR-LCC
/DSR-LCC
RES-LCC
F.G.
+5V
GND2
+24V
GND1
/TRC-LCC
N.C.
N.C.
AC-L (H)
F.G.
AC-N (H)
PS-187-3V
PPS-187
PHR-3
CZHR-03V-S
PHR-3
PHR-3
TXD LCC
RXD LCC
N.C.
RXD LCC
N.C.
12
13
14
13
14
GND
P86
P87
P87
2
1
1
2
ᵦᶃᵿᶒᶃᶐᴾᵆᵏᵎᵎᵴᵍᵏᵎᵵᵇ
4
12
ELP-12V
5
ᵥᶐᶍᶓᶌᶂ
ELP-02V
4
12
ELR-12V
5
AC-L (H)
F.G.
AC-N (H)
O
P
T
IO
N
AL
(
2
0
0
V series)
DHAI-5471FCPZ
ᵦᵿᶐᶌᶃᶑᶑ
DHAI-5472FCPZ
ᵦᵿᶐᶌᶃᶑᶑ
DHAI-3555FCPZ
Harness
DHAI-3566FCPZ
ᵦᵿᶐᶌᶃᶑᶑ
DHAI-3557FCPZ
Harness
DHAI-3552FCPZ
ᵦᵿᶐᶌᶃᶑᶑ
DHAI-3565FCPZ
ᵦᵿᶐᶌᶃᶑᶑ
DHAI-3554FCPZ
ᵦᵿᶐᶌᶃᶑᶑ
2
1
1
2
ᵦᶃᵿᶒᶃᶐᴾᵆᵏᵐᵎᵴᵍᵏᵎᵵᵇ
O
P
T
IO
N
AL
(1
0
0
V series)
4
12
ELP-12V
5
ᵥᶐᶍᶓᶌᶂ
ELP-02V
4
12
ELR-12V
5
AC-L (H)
F.G.
AC-N (H)
14
GND2
LUD
SMP-03V-NC
SMP-03V-NC
+24V
COM
COM
LCD
ELR-02V
ELR-02V
ELP-02V(RED)
ᵲᶐᵿᶗᴾᶓᶎᶎᶃᶐᴾᶊᶇᶋᶇᶒᴾᶑᶃᶌᶑᶍᶐ
ᵮᵿᶎᶃᶐᴾᶄᶃᶃᶂᴾᶑᶍᶊᶃᶌᶍᶇᶂ
ᵮᵿᶎᶃᶐᴾᶄᶃᶃᶂᴾᶁᶊᶓᶒᶁᶆ
ᵮᵿᶎᶃᶐᴾᶎᵿᶑᶑᴾᶑᶃᶌᶑᶍᶐ
ᵮᵿᶎᶃᶐᴾᶒᶐᵿᶌᶑᶎᶍᶐᶒᴾᶁᶊᶓᶒᶁᶆ
ᵳᶎᶎᶃᶐᴾᶊᶇᶋᶇᶒᴾᶑᶕᶇᶒᶁᶆ
ᵢᶍᶍᶐᴾᶑᶕᶇᶒᶁᶆ
ᵫᵿᶇᶌᴾᶓᶌᶇᶒᴾᶁᶍᶌᶌᶃᶁᶒᶇᶍᶌᴾᶑᶃᶌᶑᶍᶐ
ᵲᶐᵿᶗᴾᶁᶊᶍᶑᶃᴾᶑᶃᶌᶑᶍᶐ
ᵪᶇᶄᶒᴾᶋᶍᶒᶍᶐ
ᵮᵿᶎᶃᶐᴾᶄᶃᶃᶂᴾᶋᶍᶒᶍᶐ
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