Sharp MX-DE28 (serv.man2) Service Manual ▷ View online
MX-DE28 OPERATIONAL DESCRIPTIONS 5 – 4
Signal name
Name
Function/operation
C2LUD
Paper feed tray 2 upper limit detector
This detector detects when the tray in paper feed tray reaches its upper limit.
C2PED
Paper feed tray 2 paper empty detector
This detector detects when there is paper in paper feed tray.
C2PFD
Paper feed tray 2 paper transport detector
This detector detects when paper is in the transport path for paper feed tray.
C2SPD
Paper feed tray 2 paper level detector
This detector detects the amount of paper remaining in paper feed tray.
C2SS1
Paper feed tray 2 paper rear edge detector 1
The paper feeder recognizes that the tray for paper feed tray has been inserted when
any of paper feed tray paper rear edge detector 1 to 4 turns ON.
This detector detects the paper size of the tray in paper feed tray.
any of paper feed tray paper rear edge detector 1 to 4 turns ON.
This detector detects the paper size of the tray in paper feed tray.
C2SS2
Paper feed tray 2 paper rear edge detector 2
C2SS3
Paper feed tray 2 paper rear edge detector 3
C2SS4
Paper feed tray 2 paper rear edge detector 4
C2SSSET_D
Paper feed tray 2 attachment detection detector
This detector detects when paper feed tray is attached.
DSW-C2
Paper feed tray 2 open/close detection detector
This detector detects when the right door is opened or closed.
D1MDC
Paper feed tray 3 mount detect connector
This detector detects when paper feed tray is attached.
D1LUD
Paper feed tray 3 upper limit detector
This detector detects when the tray in paper feed tray reaches its upper limit.
D1PED
Paper feed tray 3 paper empty detector
This detector detects when there is paper in paper feed tray.
D1PPD1
Paper feed tray 3 paper pass detector 1
This detector detects when paper is in the transport path for paper feed tray.
D1PPD2
Paper feed tray 3 paper pass detector 2
This detector detects when paper is in the transport path for paper feed tray.
D1PQD
Paper feed tray 3 paper quantity detector
This detector detects the amount of paper remaining in paper feed tray.
D1CDT
Paper feed tray 3 installation detector
This detector detects installation of the paper feed tray.
D1LM
Paper feed tray 3 lift-up motor
This motor lifts up the tray in paper feed tray.
D1PFC
Paper feed tray 3 paper feed clutch
This clutch controls the ON/OFF status of the paper feed roller (paper feed tray 3).
D2LUD
Paper feed tray 4 upper limit detector
This detector detects when the tray in paper feed tray 4 reaches its upper limit.
D2PED
Paper feed tray 4 paper empty detector
This detector detects when there is paper in paper feed tray 4.
D2PQD
Paper feed tray 4 paper quantity detector
This detector detects the amount of paper remaining in paper feed tray 4.
D2CDT
Paper feed tray 4 installation detector
This detector detects installation of the paper feed tray.
D2LM
Paper feed tray 4 lift-up motor
This motor lifts up the tray in paper feed tray.
D2PFC
Paper feed tray 4 paper feed clutch
This clutch controls the ON/OFF status of the paper feed roller (paper feed tray 4).
D1PFD
Paper feed tray 4 paper pass detector
This detector detects the amount of paper remaining in paper feed tray 4.
DHOD
Horizontal transport open/close detector
This detector detects the open/close of the horizontal transportation.
DPFM
Desk paper feed motor
This motor drives the paper feed and transport sections.
DPTRC
Desk paper transport clutch
This clutch controls the ON/OFF status of the transport roller 3, vertical transport roller
1, transport roller 5 and vertical transport roller 2.
1, transport roller 5 and vertical transport roller 2.
No.
Name
Function/operation
1
Paper pickup roller1(Paper feed tray3)
Feeds paper to the paper feed roller.
2
Paper feed roller3(Paper feed tray3)
Feeds paper to the paper transport section.
3
Separation roller (Paper feed tray3)
Separates paper to prevent double feed.
4
Torque limiter
Applies a certain level of resistance power to rotation of the separation roller in order to prevent against double feed.
5
Paper pickup roller (Paper feed tray4)
Feeds paper to the paper feed roller.
6
Paper feed roller 2 (Paper feed tray4)
Feeds paper to the paper transport section.
7
Separation roller (Paper feed tray4)
Separates paper to prevent double feed.
8
Torque limiter
Applies a certain level of resistance power to rotation of the separation roller in order to prevent against double feed.
9
Level transport roller L (Drive)
Transports paper from the paper feed roller 3 to the level transport roller R.
10
Level transport roller L (Idle)
Applies a pressure to paper and the transport roller to provide a transport power of the transport roller to paper.
11
Level transport roller R (Drive)
Transports paper from the level transport roller L to the transport roller 2.
12
Level transport roller R (Idle)
Applies a pressure to paper and the transport roller to provide a transport power of the transport roller
to paper.
to paper.
13
Transport roller 3 (Drive)
Transports paper from the paper feed roller 2 to the transport roller2.
MX-DE28 OPERATIONAL DESCRIPTIONS 5 – 5
2. Paper Empty Detection
The paper empty detector (C2PED, D1PED, D2PED) 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.
where it can feed paper, as well as during paper feed operation.
3. Paper Size Detection
The size of paper contained in each tray is detected based on the
status of each of desk rear edge detectors (switches) 1 to 4 as well
as on the destination-specific settings.
status of each of desk rear edge detectors (switches) 1 to 4 as well
as on the destination-specific settings.
A/B sizes
F: ON X: OFF
Inch-based sizes
F: ON X: OFF
C2SS2
C2SS1
C2SS3
C2SS4
Rear edge detection switches
1
2
3
4
A3W
X
F
X
F
A3
X
F
F
F
B4
X
F
F
X
FC
F
F
F
X
A4R
F
X
F
X
B5R
F
X
X
F
A4
F
F
X
F
B5
F
F
X
X
Rear edge detection switches
1
2
3
4
12 x 18
X
F
X
F
11 x 17
X
F
F
F
8.5 x 14
X
F
F
X
F
F
F
X
8.5 x 11R
F
X
F
F
7.25 x 10.5R
F
X
X
F
8.5 x 11
F
F
X
X
MX-DE28 OPERATIONAL DESCRIPTIONS 5 – 6
4. Paper level detection
A. Paper feed tray 2
The paper feeder detects the amount of paper remaining in the tray as one of four levels, and displays the level it has detected.
The paper feeder determines the remaining paper level based on how many times the paper level detector turns ON during the time between
the start of the lift-up of the paper feed tray and the activation (turning ON) of the upper limit detector.
the start of the lift-up of the paper feed tray and the activation (turning ON) of the upper limit detector.
State transition chart: How the paper level detector state changes according to the amount of paper actually remaining during tray
lift-up
lift-up
Paper empty detector detects
when there is no paper remaining.
1/3 range
Sensor: logical Low
2/3 range
Sensor: logical High
3/3 range
Sensor: logical Low
When there is no paper
Paper level 1/3 position
Paper level 2/3 position
Paper level 3/3 position
Rotary panel
Paper empty detector
(CPED2, D1PED, D2PED)
Actuator for detecting the
amount of remaining paper
Paper level detector
(CSPD2, D1PQD, D2PQD)
MX-DE28 OPERATIONAL DESCRIPTIONS 5 – 7
B. Paper feed tray 3, 4
When the upper limit detector is ON and the tray is lifted up,
The amount of the remaining paper in the tray is 0% (no paper) when the paper level detector detects the empty of the paper.
The amount of the remaining paper is determined in three stages by changing the paper level detector position as the following table and figure
shown until the upper limit detector is ON after the tray is inserted and lifted up when the paper level detector detects the paper.
The paper feeder determines the remaining paper level based on how many times the paper level detector turns ON during the time between
the start of the lift-up of the paper feed tray and the activation (turning ON) of the upper limit detector.
the start of the lift-up of the paper feed tray and the activation (turning ON) of the upper limit detector.
State transition chart: How the paper level detector state changes according to the amount of paper actually remaining during tray
lift-up
lift-up
Left tray(Tray 3)
Right tray(Tray 4)
0%
0%
Paper empty detector ON (No paper)
6%
9%
Paper level detector -> Transparent -> Light block -> Transparent
Refer to the following Figure 1.
33%
50%
Paper level detector -> Transparent -> Light block
Refer to the following Figure 2.
100%
100%
Paper level detector -> Transparent
Refer to the following Figure 3.
Lift up
Lift up
Paper empty detector
(D1PED,D2PED)
<Figure 1>
<Figure 2>
<Figure 3>
Upper limit detector
(D1LUD, D2LUD)
Paper level detector
(D1PQD, D2PQD)
(Transparent) Low
Paper level detector
(D1PQD, D2PQD)
(Transparent) High
Paper level detector
(D1PQD, D2PQD)
(Light block) High
Paper level detector
(D1PQD, D2PQD)
(Transparent) Low
Paper empty detector
(D1PED,D2PED)
Upper limit detector
(D1LUD, D2LUD)
Paper level detector
(D1PQD, D2PQD)
(Light block) High
Paper level detector
(D1PQD, D2PQD)
(Transparent) Low
Lift up is stopped
Lift up is stopped
Paper empty detector
(D1PED,D2PED)
Upper limit detector
(D1LUD, D2LUD)
Paper level detector
(D1PQD, D2PQD)
(Transparent) Low
Lift up is stopped
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