Sharp AR-C172M (serv.man4) Service Manual ▷ View online
AR-C172M DESCRIPTIONS OF EACH SECTION 7 - 20
(2) Maintenance parts/major parts replacement
a. Developing unit removal
1) Open the front cabinet.
2) Lift the lever in the arrow direction A, and remove the develop-
ing unit in the arrow direction B.
b. Drum unit removal
1) Open the front cabinet and left cabinet.
2) Turn the fixing screw in the arrow direction A to release it, and
remove the drum unit in the arrow direction B.
Note: Be sure to open the left cabinet before releasing the fixing
screw.
If the fixing screw is released before opening the left cabi-
net, the lock cannot be released.
If the fixing screw is released before opening the left cabi-
net, the lock cannot be released.
In that case, push the drum unit to the rear frame side and
release the lock, and remove the drum unit.
release the lock, and remove the drum unit.
c. Drum removal
1) Remove the drum unit.
2) Remove the retaining clip from the drum shaft (A).
3) Slide the drum shaft in the arrow direction B.
4) Remove the drum in the arrow direction C.
d. Charging unit
1) Remove the drum unit.
2) Remove the screw and remove the cover (A).
3) Remove the MC unit from the MC cleaning shaft.
4) Remove the charging unit (C).
∗
When assembling, attach the drum, then attach the charging
unit. (This is to prevent against dirt by starting powder applied to
the drum.)
unit. (This is to prevent against dirt by starting powder applied to
the drum.)
e. Cleaner blade
1) Remove the drum unit.
2) Remove the charging unit.
3) Remove (A).
4) Remove the screw, and remove the cleaner blade.
A
B
A
B
ARC260(13_3_A03)
A
C
B
A
B
C
A
B
AR-C172M DESCRIPTIONS OF EACH SECTION 7 - 21
f. Toner reception seal
1) Remove the drum unit.
2) Remove the drum.
3) Remove the screw, and remove the toner reception seal.
Note: Do not deform the seal.
g. MC cleaner
1) Remove the drum unit.
2) Remove the screw, and remove cover (A).
3) Remove the MC unit.
4) Release the pawl, and remove the MC case upper in the arrow
direction.
5) Release the pawl, and remove the MC case lower in the arrow
direction.
6) Remove the screen grid.
7) Disengage the pawl, and remove the MC cleaner.
h. LED unit removal
1) Remove the rear cabinet.
2) Remove the PCU PWB unit.
3) Remove the developing unit.
4) Remove the drum unit.
5) Remove the top cover, and disconnect the connector of the
ICU.
6) Remove the screw (A) on the rear side, and remove the LED
unit.
7) Remove the LED unit.
8) Remove the connector cover and the harness.
i. LED lens cleaning
C
K
Y
M
A
A
A
A
AR-C172M DESCRIPTIONS OF EACH SECTION 7 - 22
4. Optical section (Scanner section)
A. Operational descriptions
(1) Outline
This section functions and operates as follows:
1) The copy lamp radiates light onto the document, and the
reflected light is scanned by the three line (RGB) CCD ele-
ment and then converted into image signals (analog).
ment and then converted into image signals (analog).
2) The image signals (analog) are converted into 8bit digital sig-
nals by the A/D converter.
3) The image signals (digital) are sent to the image process sec-
tion (ICU PWB).
(2) Electrical section and mechanical section
MFP PWB
ICU PWB
PCU PWB
CN13 (30pin)
30 29
26 25
28 27
24 23 22
19 18
21 20
17 16 15
12 11
14 13
GND2
REVEN
GND2
GEVEN
GND2
R
ODD
GND2
GODD
GND2
BODD
GND2
BEVEN
GND2
+5V
+12V
+12V
GND2
GND2
+5V
GND2
9
8
10
7
6
5
GND2
CCD_RS
CCD_CP
GND2
CCD_SH
GND2
4
3
2
1
CCD_CLK2
GND2
CCD_CLK1
GND2
CN11 (16pin)
15 16 14
MHPS
GND
+5V
CN8 (5pin)
1
2
5
3
4
GND
GND
+24V
LAMP
+24V
CN14 (4pin)
1
2
3
4
SM A
SM A/
SM B
SM B/
CN12 (24pin)
CN10 (14pin)
CN16 (28pin)
CN16 (28pin)
CN13 (24pin)
CN10 (14pin)
1
2
5
3
4
+24V
+24V
GND
LAMP
GND
Inverter PWB
1
2
3
MHPS
GND2
+5V
MHPS
CL
CCD PWB
CCD lens unit
Scanner motor
Copy lamp unit
AR-C172M DESCRIPTIONS OF EACH SECTION 7 - 23
(3) Major parts and signals functions and operations
RW: Abbreviation of Related Wiring, which means the said load is specified in the related figure of the mechanical and the electrical sec-
tions.
No.
Name
Code, Signal name
Function
1
Scanner motor
SM
Drives the copy lamp unit and the mirror base unit.
2
Pulley belt
—
Transmits drive power of the scanner motor to the pulley.
3
Pulley
—
Drives the scanner drive wire.
4
Scanner drive wire
—
Transmits drive power of the scanner motor to the copy lamp unit
and the mirror base unit.
and the mirror base unit.
5
Scanner unit home position sensor
MHPS
Detects the home position of the copy lamp unit.
7
Copy lamp
CL
Radiates light onto documents. (Xenon lamp)
8
Reflector
—
Converges light from the copy lamp.
9
No. 2 mirror
—
Sends document images to No. 3 mirror.
10
No. 3 mirror
—
Sends document images to the lens.
11
Lens
—
Reduces document images (photo images) and projects them to the
CCD.
CCD.
12
CCD PWB
—
Receives the document image (photo signals) and converts them
into electrical signals.
into electrical signals.
RW
Inverter PWB
LAMP
Drives the copy lamp (Xenon lamp).
RW
Scanner motor drive
SM A, A’, R, B’
RW
MHPS
MHPS
Scanner home position detect jam
5
4
2
1
3
12
9
10
8
11
7
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