AL-840 (serv.man3). AL800 840 Service Manual-Basic Manual - Sharp Copying Equipment Service Manual (repair manual). Page 11

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.

1 – 10