DOWNLOAD Sharp AL-800 (serv.man5) Service Manual ↓ Size: 1007.41 KB | Pages: 23 in PDF or view online for FREE

Model
AL-800 (serv.man5)
Pages
23
Size
1007.41 KB
Type
PDF
Document
Service Manual
Brand
Device
Copying Equipment / AL800 840 Service Manual-External view internal structure Machine operation
File
al-800-sm5.pdf
Date
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No.
Parts
Note
Code
Signal name
Name
Type
Function/operation
Active condition
11
Paper pressure
spring
Presses paper onto the paper
feed roller.
12
Paper separator
Separates paper in paper feed
operation.
13
Paper feed clutch
Mechanical
spring type
clutch
Controls ON/OFF of the paper
feed roller. (The paper feed roller
is driven by the paper feed clutch
solenoid and the main motor.
14
Paper feed clutch
lever
Driven by the paper feed clutch
solenoid to control ON/OFF of
the paper feed clutch. Prevents
against reverse rotation of the
paper feed roller.
15
Paper feed clutch
joint
Links the paper feed roller and
the paper feed roller clutch.
16
Paper feed clutch
sleeve
Controls ON/OFF of the paper
feed roller. (The paper feed roller
is driven by the paper feed clutch
solenoid and the main motor.)
17
Paper feed clutch
spring
Transmits the paper feed clutch
rotation to the paper feed clutch
sleeve.
18
Paper feed clutch
gear
Transmits the main motor power
to the paper reed roller.
19
Paper separater
spring
Applies a proper pressure to the
paper separater.
c. Optical section
<1> Scanner (reading) section
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
5 – 5
No.
Parts
Note
Code
Signal name
Name
Type
Function/operation
Active condition
1
Scanner lamp
control PWB
Drives the scanner lamp.
Maintains the lamp light quantity
at a constant level.
2
Scanner drive wire
Transmits the scanner motor
power to the scanner unit.
3
Scanner motor
Drives the scanner unit.
4
MHPS
MHPS
Scanner home
position sensor
Photo
transmission 
sensor
Detects the scanner home
position. By this signal the image
scanning operation is controlled.
HIGH (5V) when
the home position
is detected.
5
Lens
Transfers the document image to
CCD.
6
CCD
SENSOR
CCD OUT
CCD (Image)
sensor
CCD
Scans the document images
(photo signals) and converts
them into electrical signals.
Digital signal
(8Bit)
7
Scanner lamp
Radiates light to the document to
allow the CCD to scan the
document images.
8
SL SENSOR
PDA/PDK
Scanner lamp light
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.
Analog signal
(0 
∼
 0.5V)
9
No. 1 mirror
Leads the document image to
CCD.
10
No. 2 mirror
Leads the document image to
CCD.
11
No. 3 mirror
Leads the document image to
CCD.
<2> Scanner (writing) section
No.
Parts
Note
Code
Signal name
Name
Type
Function/operation
Active condition
1
SYNC
SYNC IN
Laser beam sensor
Bin diode
Detects the laser beam position.
By this signal the left image print
start position is controlled.
LOW (0V) when
laser beam is
detected.
2
No. 1 mirror
3
No. 3 mirror
Leads the laser beam to the OPC
drum.
4
Second cylindrical
lens
Corrects the laser beam
deflection by variations in the
scanning mirror angle. Corrects
the optical section dirt.
5
F
θ
 mirror (No. 2
mirror)
Corrects the laser beam form and
pitch.
6
Scanning mirror
(rotation mirror)
Scans the laser beam and
performs imaging.
7
No. 1 cylindrical
lens
Adjust the direction of laser beam.
8
Laser diode
Generates laser beam. (Controls
ON/OFF for imaging)
2)
1) SYNC
8)
7)
6)
5)
4)
3)
5 – 6
d. Image process section
<1> OPC drum section
No.
Parts
Note
Name
Type
Function/operation
1
OPC drum
OPC
Forms latent electrostatic images.
2
OPC drum earth electrode
Connects the OPC drum aluminum layer and
the earth (high voltage PWB).
3
Main charger electrode
Connects the main charger output (high
voltage PWB) and the main charger brush.
4
Discharge brush
Discharges (lower the potential of) the OPC
drum surface.
Japan only
5
Main charger brush
Charges the OPC drum.
6
Toner seal
Shield to prevent toner from leaking outside
the OPC drum unit.
1)
2)
5)
3)
6)
5)
4)
1)
5 – 7
<2> Developing section
No.
Parts
Note
Name
Type
Function/operation
1
Developing roller
Attaches toner to the latent electrostatic
images on the OPC drum to convert it into a
visible image.
2
Developing doctor
Controls toner quantity on the developing
roller and charges toner.
3
Developing bias
electrode
Connects the developing roller and the bias
voltage output (high voltage PWB).
4
Potential control
electrode
Connects the developing roller and the bias
voltage output (high voltage PWB).
5
Toner stirring roller
Lead toner to the developing roller and
charges toner.
6
Zenor diode
Maintains the potential between the
developing roller and the toner stirring roller
at a constant level.
7
Toner seal
Shields toner from leaking outside the
developing unit.
8
Potential control sheet
Maintains the developing roller potential at
a constant level.
1)
5)
3)
4)
1)
5)
3)
5)
1)
8)
6)
4)
8)
7)
2)
5 – 8
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