Sharp MX-DEX6 Service Manual ▷ View online
MX-DEX6/DEX7 OPERATIONAL DESCRIPTIONS 5 – 2
3. "High speed" Paper Feed Operation
A. When paper is fed from the upper tray:
B. When paper is fed from the lower tray:
When paper is fed from the lower tray, the paper feeder performs basically the same procedure as described above: it speeds up the transport
motor when the trailing edge of the first sheet passes the desk roller; and slows down the transport motor based on the timing in which DPFD1
turns ON detecting the next sheet.
motor when the trailing edge of the first sheet passes the desk roller; and slows down the transport motor based on the timing in which DPFD1
turns ON detecting the next sheet.
4. Paper Presence Detection
The paper presence sensor (DPED) 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, as well as during paper feed operation.
5. Paper Size Detection in Each Paper
Feed Tray
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>
{
: ON : OFF
<Inch-based sizes>
{
: ON : OFF
Trailing edge of sheet
passes the desk roller.
Transport speed
(High)
Driven into the main unit
(Process speed)
DPFD1 on
Transport speed
(High)
Deceleration to the Process
speed completes before the
sheet reaches the preliminary
paper feed stop position.
speed completes before the
sheet reaches the preliminary
paper feed stop position.
Transport speed
(Process speed)
Sheet-to-sheet
distance
distance
Transport speed
(High)
Deceleration to the Process
speed completes before the
sheet reaches the preliminary
paper feed stop position.
speed completes before the
sheet reaches the preliminary
paper feed stop position.
Transport speed
(Process speed)
The paper feeder starts feeding the first
sheet, transporting it at the High speed.
sheet, transporting it at the High speed.
When the trailing edge of the sheet has passed
the desk roller, the paper feeder speeds up the
transport motor to thereby transport the next
sheet at the High speed.
the desk roller, the paper feeder speeds up the
transport motor to thereby transport the next
sheet at the High speed.
The paper feeder detects the distance
between the first and second sheets based on
the timings in which the transport sensor
DPFD1 turns ON.
between the first and second sheets based on
the timings in which the transport sensor
DPFD1 turns ON.
The paper feeder adjusts the sheet-to-sheet
distance by altering the deceleration timing
according to the current distance between the first
and second sheets, provided that deceleration be
completed before the sheet reaches preliminary
paper feed stop position.
distance by altering the deceleration timing
according to the current distance between the first
and second sheets, provided that deceleration be
completed before the sheet reaches preliminary
paper feed stop position.
Transport speed
(Process speed)
The paper feeder starts feeding the second sheet,
transporting it at the Process speed since the first
sheet is currently in transit from the desk to the
main unit.
transporting it at the Process speed since the first
sheet is currently in transit from the desk to the
main unit.
The transport slows down to the Process speed
before the sheet reaches the preliminary paper
feed stop position.
before the sheet reaches the preliminary paper
feed stop position.
1
4
5
2
3
6
DCSS12
DCSS22
DCSS22
DCSS11
DCSS21
DCSS21
DCSS13
DCSS23
DCSS23
DCSS14
DCSS24
DCSS24
Rear edge detection switches
1
2
3
4
A3
{
{
A4
{
{
{
A4R
{
{
{
B4
{
{
{
B5
{
{
B5R
{
{
{
{
{
8.5 x 13
{
{
Rear edge detection switches
1
2
3
4
11 x 17
{
{
8.5 x 11
{
{
{
8.5 x 14
{
{
{
7.25 x 10.5R
{
{
{
{
{
8.5 x 11R
{
{
MX-DEX6/DEX7 OPERATIONAL DESCRIPTIONS 5 – 3
6. Paper level detection
A. Paper level detection
The paper feeder detects the amount of paper remaining in the tray as one of four levels (100%, 67%, 33.3%, and zero), and displays the level
it has detected.
it has detected.
B. Detection Method
The paper feeder determines the remaining paper level based on how many times the paper level sensor 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 sensor.
start of the lift-up of the paper feed tray and the activation (turning ON) of the upper limit sensor.
Paper absence sensor detects
when there is no paper remaining.
when there is no paper remaining.
1/3 range
Sensor: logical Low
Sensor: logical Low
2/3 range
Sensor: logical High
Sensor: logical High
3/3 range
Sensor: logical Low
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
DPED
(Paper presence sensor)
Actuator for detecting the
amount of remaining paper
amount of remaining paper
DCSPD
(Paper level sensor)
(Paper level sensor)
(State transition chart: How the paper level sensor state changes according to the amount of paper actually remaining during tray lift-up)
MX-DEX6/DEX7 DISASSEMBLY AND ASSEMBLY 6 – 1
MXDEX7
Service Manual
[6] DISASSEMBLY AND
ASSEMBLY
1. Paper feed section
A. Paper feed units 1 and 2
1) Remove paper feed tray 1 or 2.
2) Remove the right side door.
3) Remove paper feed unit 1 or 2.
B. Pickup roller and paper feed roller
1)
Remove paper feed tray 1 or 2.
2)
Remove the paper guide.
3)
Remove the pickup roller and paper feed roller.
C. Separation roller
1)
Remove paper feed tray 1 or 2.
2)
Remove the paper guide.
3)
Remove the separation roller.
1
2
1
2
3
MX-DEX6/DEX7 DISASSEMBLY AND ASSEMBLY 6 – 2
D. Torque limiter
1) Remove paper feed unit 1 or 2.
2) Remove the E ring and bearing and then remove the paper
2) Remove the E ring and bearing and then remove the paper
feed lower PG unit.
3) Remove the pressure release spring and then remove the
paper feed lower PG reinforcing plate. Remove the separation
pressing spring and separation pressure release plate.
pressing spring and separation pressure release plate.
4) Remove the separation roller. Remove the E ring and then
remove the separation shaft.
Remove the torque limiter.
Remove the torque limiter.
E. Transport roller
1)
Remove the paper feed upper PG reinforcing plate.
2)
Remove each part and remove the transport roller.
F. Right door open/close sensor
1)
Remove paper feed unit 1.
2)
Remove the right door open/close sensor.
1
2
1
2
3
1
2
3
4
2
3
1
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