Read Sharp AL-840 (serv.man3) Service Manual online
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
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