Sharp AL-800 (serv.man3) Service Manual ▷ View online
(Paper release operation)
The lock lever arm is always pressed onto the paper release lever by
the spring. When the paper release lever is pulled toward you, the
lock lever arm is brought into contact with the lower frame so that the
paper pressure plate is fixed at the paper release position. Under this
condition, a clearance is provided between the paper feed roller and
the paper feed tray as shown in the figure below, and the paper is
released.
the spring. When the paper release lever is pulled toward you, the
lock lever arm is brought into contact with the lower frame so that the
paper pressure plate is fixed at the paper release position. Under this
condition, a clearance is provided between the paper feed roller and
the paper feed tray as shown in the figure below, and the paper is
released.
(Paper fixing operation)
When the paper release lever is pushed down, the paper release
lever arm pushes the lock lever arm in the direction of arrow (A).
lever arm pushes the lock lever arm in the direction of arrow (A).
By the above operation, the rotating disk is lifted and the paper is
pushed by the paper feed roller.
pushed by the paper feed roller.
If printing is made without pushing down the paper release lever, the
lock lever arm is pushed by the paper feed roller gear boss in the
direction of arrow (A) and the paper feed tray is pushed to fix the
paper.
lock lever arm is pushed by the paper feed roller gear boss in the
direction of arrow (A) and the paper feed tray is pushed to fix the
paper.
*
Paper feed roller, paper feed solenoid
The paper feed solenoid is used to turn ON/OFF the paper feed
clutch. When the paper feed solenoid is turned on, the paper feed
roller is rotated.
clutch. When the paper feed solenoid is turned on, the paper feed
roller is rotated.
The paper feed clutch is a spring clutch. The paper feed roller gear
rotation is transmitted to the paper feed roller only in the direction of
(A). That is, the paper feed roller is rotated only in the direction of (A)
(paper feed direction).
rotation is transmitted to the paper feed roller only in the direction of
(A). That is, the paper feed roller is rotated only in the direction of (A)
(paper feed direction).
Notch
Lower frame
Lock lever arm
Lock lever
Spring
Paper feed tray
Paper release lever
Paper feed roller
Paper feed clutch
Clearance
(A)
Paper release lever
Sub release lever
Lock lever arm
Paper feed roller gear
Paper plessure plate
Paper release lever
Paper feed clutch
Paper feed solenoid
Paper feed clutch
ON
A
Paper feed roller
paper feed clutch
1 – 8
The paper feed roller is of circular form, and double paper feed is
prevented by the separate sheet.
prevented by the separate sheet.
The paper feed clutch lever is provided to prevent the paper feed
roller from rotating reversely. When paper feed is not performed, the
paper feed clutch lever is engaged with the paper feed roller boss
gear.
roller from rotating reversely. When paper feed is not performed, the
paper feed clutch lever is engaged with the paper feed roller boss
gear.
When removing paper for paper replacement, a reverse rotation
power is applied to the paper feed roller. In this case, the paper feed
solenoid provides enough power to prevent the paper feed roller from
rotating reversely, however an excessive stress is applied to the
spring clutch, which may be damaged. Therefore the paper feed
clutch lever is used to lock and protect the spring clutch from an
excessive stress.
power is applied to the paper feed roller. In this case, the paper feed
solenoid provides enough power to prevent the paper feed roller from
rotating reversely, however an excessive stress is applied to the
spring clutch, which may be damaged. Therefore the paper feed
clutch lever is used to lock and protect the spring clutch from an
excessive stress.
B. Scanner (reading) section
(1) Outline
In this section, the copy lamp (Xenon lamp) radiates light onto a
document, and the reflected light is detected by the image sensor
(CCD element) to convert into electrical signals (analog signals),
which are sent to the MCU PWB.
document, and the reflected light is detected by the image sensor
(CCD element) to convert into electrical signals (analog signals),
which are sent to the MCU PWB.
Paper feed roller
Separate sheet
Paper feed clutch lever
Clutch R sleeve
1 – 9
(2) Major parts
No.
Parts
Note
Code
Signal name
Name
Type
Function/operation
Active condition
1
Scanner lamp
control PWB
control PWB
Drives the scanner lamp.
Maintains the lamp light quantity
at a constant level.
Maintains the lamp light quantity
at a constant level.
2
Scanner drive wire
Transmits the scanner motor
power to the scanner unit.
power to the scanner unit.
3
Scanner motor
Drives the scanner unit.
4
MHPS
MHPS
Scanner home
position sensor
position sensor
Photo
transmission
sensor
transmission
sensor
Detects the scanner home
position. By this signal the image
scanning operation is controlled.
position. By this signal the image
scanning operation is controlled.
HIGH (5V) when
the home position
is detected.
the home position
is detected.
5
Lens
Transfers the document image to
CCD.
CCD.
6
CCD
SENSOR
SENSOR
CCD OUT
CCD (Image)
sensor
sensor
CCD
Scans the document images
(photo signals) and converts
them into electrical signals.
(photo signals) and converts
them into electrical signals.
Digital signal
(8Bit)
(8Bit)
7
Scanner lamp
Radiates light to the document to
allow the CCD to scan the
document images.
allow the CCD to scan the
document images.
8
SL SENSOR
PDA/PDK
Scanner lamp light
quantity sensor
quantity sensor
Photo diode
Detects the scanner lamp light
quantity. This signal is inputted to
the scanner lamp control PWB to
control the scanner lamp drive
voltage to maintain a constant
level of light quantity.
quantity. This signal is inputted to
the scanner lamp control PWB to
control the scanner lamp drive
voltage to maintain a constant
level of light quantity.
Analog signal
(0
(0
∼
0.5V)
9
No. 1 mirror
Leads the document image to
CCD.
CCD.
10
No. 2 mirror
Leads the document image to
CCD.
CCD.
11
No. 3 mirror
Leads the document image to
CCD.
CCD.
10)
11)
4) MHPS
8) SL SENSOR
9)
7)
6) CCD SENSOR
5)
4) MHPS
10)
8) SL SENSOR
7)
6) CCD SENSOR
11)
9)
5)
3)
2)
3)
2)
1)
4) MHPS
1 – 10
(3) Operation
a. Wiring diagram
*
Copy lamp
A cathode ray tube (Xenon lamp) is used as the light source for
reading images.
reading images.
To maintain the lamp light quantity at constant level, the following
operations are performed.
operations are performed.
The copy lamp light quantity sensor is provided in the scanner unit to
detect the copy lamp light quantity.
detect the copy lamp light quantity.
The copy lamp drive voltage corresponding to the sensor output level
(CLIN) is outputted.
(CLIN) is outputted.
The copy lamp is driven by the scanner lamp control PWB.
GND
1
A-GND
2
CCDOUT
3
A-GND
4
A5V
5
5V
6
12V
7
f1
9
GND
10
GND
8
f2
11
GND
12
SH-
13
GND
14
RS
15
GND
16
SP
17
CP
19
GND
20
GND
18
NC
21
GND
22
5V
12V
A/D
D-GND
1
A-GND
2
CCDOUT
3
A-GND
4
A5V
5
5V
6
12V
7
f1
9
D-GND
10
D-GND
8
f2
11
D-GND
12
SH-
13
D-GND
14
RS
15
D-GND
16
SP
17
CP
19
D-GND
20
D-GND
18
NC
21
D-GND
22
CFL-H
1
2
3
2
3
FGND
4
PDA
5
PDK
6
CFL-L
7
24V
1
P-GND
2
ON/OFF
3
PD
4
24V
1
P-GND
2
CL-CNT
3
CL-IN
4
MRMT0
1
2
3
4
5
2
3
4
5
GND
1
MHPS
2
5V
3
GND
1
MHPS
2
5V
3
MRMT1
MRMT2
MRMT3
24V-mir
MRMT2
MRMT3
24V-mir
DRIVER
24V
MCU(PCU) PWB
CCDD1
CCDD0
CCDD2
CCDD3
CCDD4
CCDD5
CCDD6
CCDD7
CCDD3
CCDD4
CCDD5
CCDD6
CCDD7
IC112
ASIC
IC8
5V
CCD UNIT
CPU
IC5
CLCNT
IC13
(Not used)
MRMT0
MRPS1
MRPS2
MHPS
MRMT1
MRMT2
MRMT3
MRMT2
MRMT3
RAMP UNIT
CN2
CN1
INVERTER UNIT
SCANER MOTOR
SCANER H.P
SENSOR
SENSOR
CN10
1 – 11
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