Read Sharp AL-840 (serv.man8) Service Manual online
(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
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).
Ua001/P010).
Use absolute alcohol to clean the scanner mirror (motor) unit, and
the laser beam sensor.
the laser beam sensor.
Clean the whole surface of the scanner mirror (motor) unit as
shown in the figure below.
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)
(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
P005
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