DOWNLOAD Sharp AL-840 (serv.man8) Service Manual ↓ Size: 3.02 MB | Pages: 32 in PDF or view online for FREE

Model
AL-840 (serv.man8)
Pages
32
Size
3.02 MB
Type
PDF
Document
Service Manual
Brand
Device
Copying Equipment / AL800 840 Service Manual-Disassembly
File
al-840-sm8.pdf
Date
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*
Cleaning
Use absolute alcohol to clean the scanner lamp light quantity
sensor as shown below.
*
Troubles caused by improper work
1) Improper copy density 
(8)
Loosen the wire fixing screw of the scanner unit A (S004/Ua001/
Ub001), and remove the wire.
(9)
Remove the screw, and remove the shaft.
(10) Remove the connector, cut the binding band, and remove the
scanner unit A (S004/Ua001/Ub001).
(11) Remove the No. 1 mirror (S004/Ua001/Ub001/P002).
S004/Ua001/
Ub001/P003/CLN
S004/Ua001/Ub001
S004/Ua001/Ub001
9 – 17
*
Cleaning
Use absolute alcohol to clean the No. 1 mirror as shown below. 
*
Troubles caused by improper work
1) Copy image defect
(Distortion)
(Streaks in the sub scanning direction)
(Uneven density)
2) L1-00 trouble
3) L3-00 trouble
 S004/Ua001/Ub002 
Scanner unit B
 S004/Ua001/Ub002/P001 
No. 2 mirror
 S004/Ua001/Ub002/P002 
No. 3 mirror 
(1)
Remove the rear cabinet  S001/P001  .
(2)
Remove the front upper cabinet  S001/P002  .
(3)
Remove the right cabinet  S001/P003  .
(4)
Remove the left cabinet  S001/P004  .
(5)
Remove the document table glass  S001/P007  .
(6)
Remove the fan motor unit.  S010/P001  .
(7)
Remove the scanner drive wire  S004/Ua001/P008  .
(8)
Remove the scanner unit B (S004/Ua001/Ub002).
(9)
Remove the screw, and remove the No. 2 mirror (S004/Ua001/
Ub002/P001) and the No. 3 mirror (S004/Ua001/Ub002/P002).
*
Note for assembly
Be careful not to mistake the front and the back sides of the no. 2
and No. 3 mirrors.
*
Cleaning
Use absolute alcohol to clean the No. 2 and No. 3 mirrors.
*
Troubles caused by improper work
1) Copy image defect
(Distortion)
(Streaks in the sub scanning direction)
(Uneven density)
2) L1-00 trouble
3) L3-00 trouble
S004/Ua001/Ub001/
P002/CLN
S004/Ua001/Ua002
S004/Ua001/Ub002/
P001/CLN
S004/Ua001/Ub002/
P002/CLN
S004/Ua001/Ub002/
P001/CLN
S004/Ua001/Ub002/
P002/CLN
9 – 18
S005
Scanner (writing) section
Section
Unit
Part
JOB
CODE
After-work
NOTE
S No.
Part name
Ua No.
Unit name
Ub No.
Unit name
P No.
Part name
JOB No.
S 005
Scanner (writing)
Ua 001
Scanner (writing)
unit
ASS
P 001
No. 1 mirror
CLN
P 002
No. 3 mirror
CLN
P 003
No. 2 cylindrical lens
CLN
P 004
f
θ
 mirror (No. 2 mirror)
ASS
CLN
P 005
Scanning mirror (motor) unit
ASS
CLN
P 006
Laser unit
ASS
P 007
Laser beam sensor
ASS
CLN
P 008
Paper feed solenoid
ASS
P 009
Paper empty detector
ASS
P 010
No. 1 cylindrical lens
CLN
P 011
Toner empty sensor
ASS
S005/Ua001/P002/CLN
S005/Ua001/
P003/CLN
S005/Ua001/
P004/CLN
S005/Ua001/
P005/CLN
S005/Ua001/
P010/CLN
S005/Ua001/
P009
S005/Ua001/
P007/CLN
S005/Ua001/P001/CLN
S005/Ua001/P080
S005/Ua001/P006
S005/Ua001/
P011
 S005/Ua001 
Scanner unit
 S005/Ua001/P001 
No. 1 mirror
 S005/Ua001/P002 
No. 3 mirror
 S005/Ua001/P003 
No. 2 cylindrical lens
 S005/Ua001/P004 
No. 2 mirror (f
θ
 mirror)
 S005/Ua001/P005 
Scanning mirror (motor) unit
 S005/Ua001/P006 
Laser unit
 S005/Ua001/P007 
Laser beam sensor PWB
 S005/Ua001/P008 
Paper feed solenoid
 S005/Ua001/P009 
Paper empty detector
 S005/Ua001/P010 
No. 1 cylindrical lens
 S005/Ua001/P011 
Toner empty sensor
(1)
Remove the rear cabinet  S001/P001  .
(2)
Remove the front upper cabinet  S001/P002  .
(3)
Remove the right cabinet  S001/P003  .
(4)
Remove the left cabinet  S001/P004  .
(5)
Remove the document table glass  S001/P007  .
(6)
Remove the fan motor unit  S010/P001  .
(7)
Remove the scanner unit (reading)  S004/Ua001  .
*
Cleaning
Use absolute alcohol to clean the No. 1 mirror (S005/Ua001/
P001), No. 3 mirror (S005/Ua001/P002), and No. 2 cylindrical lens
(S005/Ua001/P003).
*
Note
Do not remove those mirrors.
S005/Ua001/P002/CLN
S005/Ua001/P001/CLN
S005/Ua001/P003/CLN
9 – 19
(8)
Remove the screw, and remove the no. 2 mirror (f
θ
 mirror)
(S005/Ua001/P004).
*
Cleaning
Use absolute alcohol to clean the concave surface of the no. 2
mirror (f
θ
 mirror).
(9)
Remove the scanner cover.
(10) Remove the screw and the connector, and remove the scanner
mirror (motor) unit (S005/Ua001/P005).
(11) Remove the screw, and remove the laser unit (S005/Ua001/
P006).
(12) Remove the connector, and remove the laser beam sensor
PWB (S005/Ua001/P007).
(13) Remove the screw and the spring, and remove the paper feed
solenoid (S005/Ua001/P080).
(14) After removing the laser beam sensor PWB, remove the paper
empty detector (S005/Ua001/P009) along the boss direction.
*
Cleaning
Use absolute alcohol to clean the No. 1 cylindrical lens (S005/
Ua001/P010).
Use absolute alcohol to clean the scanner mirror (motor) unit, and
the laser beam sensor.
Clean the whole surface of the scanner mirror (motor) unit as
shown in the figure below. 
*
Troubles caused by improper work
1) Print image defect
(Insufficient print density)
(Streaks in the main scanning direction)
(Image lack)
(E7-03 error)
(15) Remove the MCU (PCU) PWB  S009/Ua002  .
(16) Remove the power PWB unit.  S009/Ua001  .
(17) Remove the scanner (writing) unit.  S005/Ua001  .
(18) Remove the screw and the connector, and remove the toner
empty sensor (S005/Ua001/P011).
S005/Ua004/P004/CLN
S005/Ua001/P010/CLN
S005/Ua001/P005
S005/Ua001/
P005
9 – 20
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