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Model
AL-1622 (serv.man9)
Pages
8
Size
178.27 KB
Type
PDF
Document
Service Manual
Brand
Device
Copying Equipment / Operational descriptions
File
al-1622-sm9.pdf
Date

Sharp AL-1622 (serv.man9) Service Manual ▷ View online

AL-1611/AL-1622
OPERATIONAL DESCRIPTIONS
6 – 6
Makes the laser scanning speeds at both ends of the drum same as
each other.
B. Laser beam path
5. PAPER FEED SECTION
A. Basic structure
≠ 
≠ 
c
a
b
c
d = e = f
d e
f
1
No. 1 cassette paper feed roller (Semi-circular roller)
Picks up paper from No. 1 cassette.
2
Main motor
Drives the process section and the paper transport section.
3
No. 1 cassette paper feed solenoid
Rotates and controls No. 1 cassette paper feed roller.
4
No. 1 cassette paper feed roller clutch
Drives No. 1 cassette paper feed roller.
5
Manual paper feed roller
Picks up paper from the manual paper feed tray.
6
Manual paper transport roller
Transport paper which was picked up from the manual paper feed tray.
7
Manual paper feed roller clutch
Drives the manual paper feed roller.
8
Manual paper transport roller clutch
Drives the manual paper transport roller.
9
Manual paper feed roller solenoid
Rotates and controls the manual paper feed roller.
10
Manual paper transport roller solenoid
Rotates and controls the manual paper transport roller.
11
Resist roller
Takes synchronization between the paper lead edge and the image lead edge.
12
Resist roller clutch
Drives the resist roller.
13
Resist roller solenoid
Rotates and controls the resist roller.
AL-1611/AL-1622
OPERATIONAL DESCRIPTIONS
6 – 7
B. Brief descriptions of operations
This machine allows two ways of paper feed system: cassette paper
feed and manual paper feed.
The cassette of universal type is employed to hold 250 sheets. The
front loading system allows to attach or detach the cassette from the
front of the machine.
Paper size can be selected by the user.
Since this model is not equipped with the automatic paper select func-
tion, paper size detection is not performed.
(1) Cassette paper feed operation
Select the cassette and press the START button, and the paper feed
roller solenoid will be turned on and the paper feed clutch will be
released.
The drive power of the main motor is transmitted through the paper feed
roller clutch to the paper feed roller, rotating the paper feed roller and
feeding paper.
(2) Manual paper feed tray operation
Select the manual paper feed tray and press the START button, and the
manual paper feed roller will be turned on to bring the paper feed roller
in contact with paper and lift the shutter simultaneously.
The drive power of the main motor is transmitted through the manual
paper feed roller clutch to the manual paper feed roller, rotating the
manual paper feed roller and feeding paper. 
(3) Resist roller
In order to make synchronization between the paper lead edge fed from
the paper feed port and the image lead edge, the roller is kept station-
ary for a certain time after the paper reaches at the roller towarp the
paper a little.
When the paper is warped to a certain level, the resist roller solenoid is
turned on to release the resist roller clutch.
The drive power of the main motor is transmitted through the resist
roller clutch to the resist roller, rotating the resist roller and feeding
paper.
6. FUSING SECTION 
A. Basic composition
(Top view)
B. Heat roller
A pressure 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.
C. Separator pawl
Four separator pawls are used on the upper heat roller. The separator
pawls are teflon coated to reduce friction with the roller and prevent a
smear on the paper caused by the separator pawl.
D. Thermal control
1) The heater lamp, thermistor, main PWB, DC power supply PWB,
and triac within the power supply unit are used to control the tem-
perature in the fuser unit. To prevent against abnormally high tem-
perature in the fuser unit, a thermostat is used for safety purposes.
2) The surface temperature of the upper heat roller is set to 180°C ~
195°C. The surface temperature during the power save mode is set
to 100°C.
5
4
3
2
1
8
6
7
1
Before-fusing 
paper guide
Guides the paper transported from the process
section to the fusing unit.
2
Upper heat 
roller
Applies heat and pressure to the paper to fuse.
3
Thermistor
Detects the surface temperature of the upper
heat roller.
4
Thermostat
Stops power supply to the heat roller in case of
an abnormally high temperature of the heat
roller.
5
Separation 
pawl
Separates the print paper from the upper heat
roller.
6
POD1
Detects that the paper has been transported
from the fusing section.
7
Heater lamp
Heats the heat roller.
8
Lower heat 
roller
Applies a pressure to the paper together with
the upper heat roller.
2
7
5
8
4
3
Safety device
(thermal breaker, thermal
fuse)
Triac (in the
power supply unit)
Heated  by the
heater  lamp.
(950W )
The surface temperature
of the  upper hea t 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 )
AL-1611/AL-1622
OPERATIONAL DESCRIPTIONS
6 – 8
3) The self-check function comes active when one of the following
malfunctions occurs, and an "H" is displayed on the copy quantity
display.
Fusing temperature error value
H4 (Low temperature error)
• During machine operation 
The case where the fusing temperature (thermistor output value)
does not reach 155°C within 55 sec from lighting of the heater
lamp. (If the toner motor rotates for 10 sec or more continuously
when starting the machine, the case where the fusing tempera-
ture does not reach 155°C within 60 sec.)
• During printing
When the fusing temperature (thermistor output value) falls below
145°C. 
H3 (High temperature error)
Fusing temperature (thermistor output value) of about 220 to 240°C
(varies depending on the resistance.)
E. Fusing resistor
(1) Fusing resistor
Since the upper heat roller is conductive when copy paper is highly
moistured and the distance between the transfer unit and the fusing unit
is short, the transfer current leaks through the copy paper, the upper
heat roller and the discharging brush.
To prevent against this, a resistor of 150MOhm is provided between the
frame and the discharge brush to minimize leak current and improve
transfer efficiency.
7. SPF SECTION <AL-1622 ONLY>
A. Brief descriptions of operations
B. Document size detection 
Document size detection by document set tray 
When a document is set on the document set tray in the auto mode of
paper/copy magnification ratio selection, the document size is detected
to perform the auto selection function of paper and the copy magnifica-
tion ratio according to the detected document size. 
When documents of different sizes are mixed and set on the tray, the
max. size is detected. The document width is detected by the document
width sensors (W1, W2, W3), and the document length is detected by
the document length sensors (L1, L2) to determine the document size. 
The document size judgment is made after a certain time from when the
document set sensor (W0) detects the document.
Note: Sensor ON: 
F
OFF: 
D
 
 
1) Document set (Document set sensor ON)
3) Copy start (Machine)
4) SPF motor ON
5) Pickup solenoid ON
6) Pickup roller rotation
7) Paper feed roller rotation
8) Paper entry sensor detects paper presence.
9) PS roller rotation
10) Copy operation (Machine)
11) Transport roller  rotation
12) Paper exit roller rotation
13) Document exit
YES
14) Next document
 NO 
2) Document size detection (The document width is detected
    with  document width sensors W1, W2, and W3, and the
    document length is detected with document length sensors
    L1 and L2.)
15) SPF motor OFF
Document size 
and set direction
Document width sen-
sor
D o c u m e n t
length sensor
W1
W2
W3
L1
L2
AB series
A5
F
D
D
D
D
B5
F
F
D
D
D
A5R
D
D
D
D
D
A4
F
F
F
D
D
B5R
D
D
D
F
D
A4R
F
D
D
F
D
8.5" x 13"
F
D
D
F
F
B4
F
D
D
F
F
A3
F
F
F
F
F
 Inch series
8.5" x 5.5"
F
D
D
D
D
8.5" x 5.5"R
D
D
D
D
D
11" x 8.5"
F
F
F
D
D
11" x 8.5"R
F
D
D
F
D
8.5" x 13"
F
D
D
F
F
8.5" x 14"
F
D
D
F
F
11" x 17"
F
F
F
F
F
L2
L1
W1
W0
W2
W3
AL-1611/AL-1622
OPERATIONAL DESCRIPTIONS
6 – 8
3) The self-check function comes active when one of the following
malfunctions occurs, and an "H" is displayed on the copy quantity
display.
Fusing temperature error value
H4 (Low temperature error)
• During machine operation 
The case where the fusing temperature (thermistor output value)
does not reach 155°C within 55 sec from lighting of the heater
lamp. (If the toner motor rotates for 10 sec or more continuously
when starting the machine, the case where the fusing tempera-
ture does not reach 155°C within 60 sec.)
• During printing
When the fusing temperature (thermistor output value) falls below
145°C. 
H3 (High temperature error)
Fusing temperature (thermistor output value) of about 220 to 240°C
(varies depending on the resistance.)
E. Fusing resistor
(1) Fusing resistor
Since the upper heat roller is conductive when copy paper is highly
moistured and the distance between the transfer unit and the fusing unit
is short, the transfer current leaks through the copy paper, the upper
heat roller and the discharging brush.
To prevent against this, a resistor of 150MOhm is provided between the
frame and the discharge brush to minimize leak current and improve
transfer efficiency.
7. SPF SECTION <AL-1622 ONLY>
A. Brief descriptions of operations
B. Document size detection 
Document size detection by document set tray 
When a document is set on the document set tray in the auto mode of
paper/copy magnification ratio selection, the document size is detected
to perform the auto selection function of paper and the copy magnifica-
tion ratio according to the detected document size. 
When documents of different sizes are mixed and set on the tray, the
max. size is detected. The document width is detected by the document
width sensors (W1, W2, W3), and the document length is detected by
the document length sensors (L1, L2) to determine the document size. 
The document size judgment is made after a certain time from when the
document set sensor (W0) detects the document.
Note: Sensor ON: 
F
OFF: 
D
 
 
1) Document set (Document set sensor ON)
3) Copy start (Machine)
4) SPF motor ON
5) Pickup solenoid ON
6) Pickup roller rotation
7) Paper feed roller rotation
8) Paper entry sensor detects paper presence.
9) PS roller rotation
10) Copy operation (Machine)
11) Transport roller  rotation
12) Paper exit roller rotation
13) Document exit
YES
14) Next document
 NO 
2) Document size detection (The document width is detected
    with  document width sensors W1, W2, and W3, and the
    document length is detected with document length sensors
    L1 and L2.)
15) SPF motor OFF
Document size 
and set direction
Document width sen-
sor
D o c u m e n t
length sensor
W1
W2
W3
L1
L2
AB series
A5
F
D
D
D
D
B5
F
F
D
D
D
A5R
D
D
D
D
D
A4
F
F
F
D
D
B5R
D
D
D
F
D
A4R
F
D
D
F
D
8.5" x 13"
F
D
D
F
F
B4
F
D
D
F
F
A3
F
F
F
F
F
 Inch series
8.5" x 5.5"
F
D
D
D
D
8.5" x 5.5"R
D
D
D
D
D
11" x 8.5"
F
F
F
D
D
11" x 8.5"R
F
D
D
F
D
8.5" x 13"
F
D
D
F
F
8.5" x 14"
F
D
D
F
F
11" x 17"
F
F
F
F
F
L2
L1
W1
W0
W2
W3
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Sharp AL-1622 (serv.man9) Service Manual ▷ Download