MX-DEX2 (serv.man7). Section 5 - Operational Descriptions . - Sharp Copying Equipment Service Manual (repair manual)

mx-dex2 (serv.man7) service manual
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MX-DEX2 (serv.man7)
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Service Manual
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Device
Copying Equipment / Section 5 - Operational Descriptions .
File
mx-dex2-sm7.pdf
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MX-DEX1/DEX2  OPERATIONAL DESCRIPTIONS  5 – 1
Service Manual      
 
[5] OPERATIONAL DESCRIPTIONS
1. Lift Operation
After the tray has been inserted, the lift motor is turned ON, and the tray is lifted to and stopped at a position where it can feed paper with the
upper limit sensor (DLUD) turned ON. 
The lift-up motor output is as shown below: 
2. 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 [DLUD] being
ON) and there is paper in the tray. 
When paper feed takes place, the transport motor (DPFM), the transport clutch (DTRC), and the paper feed clutch (DPUC) operate in the tim-
ings shown in the diagrams below. 
In addition, there are times when the paper feeder speeds up paper feed by performing "turbo" paper feed in the desk so that it can meet the
CPM conditions required by the main unit. 
Start lift-up
Finish lift-up
DLUM
(motor output)
DLUD
(upper limit sensor)
Job start request received
Job end request
received
Preliminary paper feed request received
DPFM
(transport motor output)
DTRC
(transport clutch)
DPUC1
(paper feed clutch)
DPFD1
(transport sensor)
TRC
(main unit synchroni-
zation signal)
Resist synchronization
Paper feed clutch
ON control
Paper feed clutch
OFF control
[Without "turbo" paper feed]
Job end request
received
Preliminary paper feed request received
Acceleration
Deceleration
Deceleration
Acceleration timing control
Resist synchronization
[With "turbo" paper feed]
Job start request received
DPFM
(transport motor output)
DTRC
(transport clutch)
DPUC1
(paper feed clutch)
DPFD1
(transport sensor)
TRC
(main unit synchroni-
zation signal)
Paper feed clutch
OFF control
Paper feed clutch
ON control
Deceleration timing
control
MX-DEX1/DEX2  OPERATIONAL DESCRIPTIONS  5 – 2
3. "Turbo" 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. 
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. 
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. 
<A/B sizes>
{
: ON   ✕: OFF
<Inch-based sizes>
{
: ON   ✕: OFF
Trailing edge of sheet
passes the desk roller.
Transport speed
(High)
Fetched 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.
Transport speed
(Process speed)
Sheet-to-sheet
distance
Transport speed
(High)
Deceleration to the Process
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.
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 paper feeder detects the distance
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.
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.
The transport slows down to the Process speed
before the sheet reaches the preliminary paper
feed stop position.
1
4
5
2
3
6
DCSS12
DCSS22
DCSS11
DCSS21
DCSS13
DCSS23
DCSS14
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-DEX1/DEX2  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. 
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. 
Paper absence sensor 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
DPED
(Paper presence sensor)
Actuator for detecting the
amount of remaining paper
DCSPD
(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)
Page of 3

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