DOWNLOAD Sharp AL-2060 (serv.man2) Service Manual ↓ Size: 14.34 MB | Pages: 127 in PDF or view online for FREE

AL-2020/2035/2040/2050/2060  OPERATIONAL DESCRIPTIONS  7 - 4

A Teflon roller is used for the heat roller and a silicone rubber roller
is used for the lower heat roller for better toner fusing performance
and paper separation.

Three separator pawls are used on the upper heat roller. The sep-
arator pawls are Teflon coated to reduce friction with the roller and
prevent a smear on the paper caused by the separator pawl.

1) The heater lamp, thermistor, main PWB, DC power supply

PWB, and triac within the power supply unit are used to control
the temperature in the fuser unit.
To prevent against abnormally high temperature in the fuser
unit, a thermal breaker and thermal fuse are used for safety pur-
poses.

2) The surface temperature of the upper heat roller is set to 160 -

200°C. The surface temperature during the power save mode is
set to 100°C.

3) The self-check function comes active when one of the following

malfunctions occurs, and an "H" is displayed on the multicopy
window.

a. When the heat roller surface temperature rises above 240°C.

b. When the heat roller surface temperature drops below 100°C

during the copy cycle.

c. Open thermistor

d. Open thermal fuse

e. When the heat roller temperature does not reach 190°C within

27 second after supplying the power.

This model is provided with a fusing resistor in the fusing section
to improve transfer efficiency.

Since the upper heat roller is conductive, when using copy paper
that contains moisture and the distance between the transfer unit
and the fusing unit is short, the transfer current may find a path to
ground via the copy paper, the upper heat roller and the discharg-
ing brush.

Paper feed is made in two ways; the tray paper feed and the man-
ual paper feed. The tray is of universal-type, and has the capacity
of 250 sheets.

The front loading system allows you to install or remove the tray
from the front cabinet.

The general descriptions on the tray paper feed and the manual
paper feed operation are given below.

Separator pawl

Separator pawl

PPD2

Thermal fuse

Thermistor

Heat roller

Paper guide

Pressure roller

Heat roller

Thermistor

Thermal fuse

Heater lamp

Separator pawl

Safety device
(thermal breaker, thermal
fuse)

Triac (in the
power supply unit)

Heated by the heater 

lamp. (950W)

The surface temperature
of the upper heat roller is
sensed by the thermistor.

Level of the thermistor is
controlled by the main PWB.

With the signal from the
main PWB, the triac is
controlled on and off.
(power supply PWB)

1

Scanner unit

8

Drum

2

Copy lamp

9

Transfer unit

3

LSU (Laser unit)

10

Pickup roller

4

Paper exit roller

11

Manual paper feed tray

5

Main charger

12

Manual paper feed roller

6

Heat roller

13

PS roller unit

7

Pressure roller

14

Paper feed roller

1

2

5

3

4

6

7
8
9
10

11

12

13

14

AL-2020/2035/2040/2050/2060  OPERATIONAL DESCRIPTIONS  7 - 5

1) The figure below shows the positions of the pick-up roller, the

paper feed clutch sleeve, and the paper feed latch in the initial
state without pressing the Start key after lighting the ready
lamp.
The paper feed latch is in contact with the projection of the
clutch sleeve.

2) When the Start key is pressed, the main drive motor starts

rotating to drive each drive gear.
The pick-up drive gear also is driven at that time. Since, how-
ever, the paper feed latch is in contact with the projection of the
clutch sleeve, rotation of the drive gear is not transmitted to the
pick-up roller, which does not rotate therefore.

3) After about 0.1 sec from when the main motor start rotating, the

tray paper feed solenoid (PFS) turns on for a moment.
This disengages the paper feed latch from the projection of the
clutch sleeve, transmitting rotation of the pick-up drive gear to
the paper feed roller shaft, rotating the pick-up roller to feed the
paper.

4) After more than half rotation of the pick-up roller, the paper feed

latch is brought in contact with a notch on the clutch sleeve,
stopping rotation of the pick-up roller.

5) At this time, the paper is fed passed the paper entry detection

switch (PPD1), and detected by it. After about 0.15 sec from
detection of paper by PPD1, the tray paper feed solenoid (PFS)
turns on so that the clutch sleeve projection comes into contact
with the paper feed latch to stop the pick-up roller. Then the
pick-up roller rotates for about 0.15 sec so that the lead edge of
the paper is evenly pressed on the resist roller, preventing
against skew feeding.

6) To release the resist roller, the tray paper feed solenoid and the

resist solenoid are turned on by the paper start signal to disen-
gage the resist start latch from the clutch sleeve, transmitting
rotation of the resist drive gear to the resist roller shaft. Thus the
paper is transported by the resist roller.

7) After the resist roller starts rotating, the paper is passed through

the pre-transfer guide to the transfer section. Images are trans-
ferred on the paper, which is separated from the OPC drum by
the drum curve and the separation section.

8) The paper separated from the drum is passed through the fus-

ing paper guide, the heat roller (fusing section), POD (paper out
detector) to the copy tray.

OFF

PFS

OFF

RRS

OFF

PFS

OFF

RRS

ON

PFS

OFF

RRS

OFF

PFS

ON

RRS

AL-2020/2035/2040/2050/2060  OPERATIONAL DESCRIPTIONS  7 - 6

1) Before paper feed operation, the manual paper feed solenoid

(MPFS) is turned OFF as shown in the figure below.

2) When the Start key is pressed, the manual paper feed solenoid

(MPFS) turns on to disengage the manual paper feed latch.
A from the manual paper feed clutch sleeve A, rotating the man-
ual paper feed roller and the manual take-up roller. At the same
time, the manual paper feed stopper opens and the manual
take-up roller is pressed to the surface of the paper to start
paper feeding.

3) When pawl C of the manual paper feed clutch sleeve is

engaged with the manual feed latch, the manual feed stopper
falls and the manual take-up roller rises. At that time, the man-
ual paper feed roller is rotating.

4) The lead edge of the transported paper is pressed on the resist

roller by the transport roller. Then the paper is stopped tempo-
rarily to allow synchronization with the lead edge of the image
on the OPC drum.
From this point, the operation is the same as the paper feed
operation from the tray. (Refer to 7-5 - 8.)

5) The solenoid turns off to close the gate and return to the initial

state.

OF

MPFS

F

C

A

ON

MPFS

A

C

ON

MPFS

A

C

OF

MPFS

F

A

C

AL-2020/2035/2040/2050/2060  OPERATIONAL DESCRIPTIONS  7 - 7

1) When the power is turned on, the detection gear 38T is rotated

in the arrow direction by the detection gear 20T to push the
micro-switch (process detection switch) installed to the machine
sensor cover, making a judgement as a new drum.

2) When the detection gear 38T turns one rotation, there is no

gear any more and it stops.

The latch section of the 38T gear is latched and fixed with the
projection of the process cover.

The SPF (Single Path Feeder) is installed to the AL-2035/2040 as a
standard provision.

The RSPF (Reverse Single Path Feeder) is installed to the AL-
2050/2060 as a standard provision.

It automatically copies up to 50 sheets of documents of a same
size. (Only one set of copies)

a

PPD1 jam

PPD1 does not turn off within 4 sec after 
turning on the resist roller.

b

PPD2 jam

PPD2 is off immediately after turning on the 
resist roller.

PPD2 does not turn off within 1.2 sec after 
turning off the resist roller.

c

POD jam 

POD does not turn on within 2.9 sec after 
turning on the resist roller.

POD does not turn off within 1.5 sec - 2.7 sec 
after turning off PPD2.

Gear 20T

Process detection switch

Gear 38T

Gear notch

Gear pawl

Projection

Gear notch

Gear pawl

Projection