Read Sharp AL-840 (serv.man3) Service Manual online
(3) Operation
a. Wiring diagram
*
Copy lamp
A cathode ray tube (Xenon lamp) is used as the light source for
reading images.
reading images.
To maintain the lamp light quantity at constant level, the following
operations are performed.
operations are performed.
The copy lamp light quantity sensor is provided in the scanner unit to
detect the copy lamp light quantity.
detect the copy lamp light quantity.
The copy lamp drive voltage corresponding to the sensor output level
(CLIN) is outputted.
(CLIN) is outputted.
The copy lamp is driven by the scanner lamp control PWB.
GND
1
A-GND
2
CCDOUT
3
A-GND
4
A5V
5
5V
6
12V
7
f1
9
GND
10
GND
8
f2
11
GND
12
SH-
13
GND
14
RS
15
GND
16
SP
17
CP
19
GND
20
GND
18
NC
21
GND
22
5V
12V
A/D
D-GND
1
A-GND
2
CCDOUT
3
A-GND
4
A5V
5
5V
6
12V
7
f1
9
D-GND
10
D-GND
8
f2
11
D-GND
12
SH-
13
D-GND
14
RS
15
D-GND
16
SP
17
CP
19
D-GND
20
D-GND
18
NC
21
D-GND
22
CFL-H
1
2
3
2
3
FGND
4
PDA
5
PDK
6
CFL-L
7
24V
1
P-GND
2
ON/OFF
3
PD
4
24V
1
P-GND
2
CL-CNT
3
CL-IN
4
MRMT0
1
2
3
4
5
2
3
4
5
GND
1
MHPS
2
5V
3
GND
1
MHPS
2
5V
3
MRMT1
MRMT2
MRMT3
24V-mir
MRMT2
MRMT3
24V-mir
DRIVER
24V
MCU(PCU) PWB
CCDD1
CCDD0
CCDD2
CCDD3
CCDD4
CCDD5
CCDD6
CCDD7
CCDD3
CCDD4
CCDD5
CCDD6
CCDD7
IC112
ASIC
IC8
5V
CCD UNIT
CPU
IC5
CLCNT
IC13
(Not used)
MRMT0
MRPS1
MRPS2
MHPS
MRMT1
MRMT2
MRMT3
MRMT2
MRMT3
RAMP UNIT
CN2
CN1
INVERTER UNIT
SCANER MOTOR
SCANER H.P
SENSOR
SENSOR
CN10
1 – 11
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