Sharp AR-C172M (serv.man4) Service Manual ▷ View online
AR-C172M DESCRIPTIONS OF EACH SECTION 7 - 4
(2) Maintenance parts replacement procedure
a. Fusing unit removal
1) Open the left cabinet.
2) Loosen the roller knob (A) and remove the fusing unit (B).
b. Upper thermistor
1) Remove the fusing until from the machine.
2) Remove the screw and the harness cover (A).
3) Remove the connector, the screw, and the harness, and
remove the thermistor (B).
c. Lower thermistor
1) Remove the fusing unit from the machine.
2) Remove the screws, and remove the fusing front PG (A).
3) Remove the connector, the screw, and the harness, and
remove the thermistor (B).
d. Upper heater lamp
1) Remove the fusing unit from the machine.
2) Remove the screw and remove the fusing front cover (A).
Remove the harness cover (B).
3) Remove the connector, the screw, and the lamp holder (C),
and remove the upper heater lamp (D).
e. Lower heater lamp
1) Remove the fusing unit from the machine.
2) Remove the screw, and remove the fusing front cover (A).
3) Remove the screw, and remove the fusing front PG (B).
4) Remove the connector, the screw, and the lamp holder (C),
and remove the lower heater lamp (D).
A
B
A
B
A
B
A
B
C
D
A
B
C
D
AR-C172M DESCRIPTIONS OF EACH SECTION 7 - 5
f. Upper heat roller, bearing, gear
1) Remove the fusing unit from the machine.
2) Remove the lever (A), and release the roller pressure.
3) Remove the screw.
4) Open the upper fusing section.
5) Remove the heat roller upper unit (B).
∗
When assembling, put the flanges of the upper bearings outside
of the frames F and R.
of the frames F and R.
6) Remove the C-ring and the bearing, and remove the gear (A)
and the heat roller (B).
g. Lower heat roller, bearing
1) Remove the fusing unit from the machine.
2) Remove the screw, and open the upper fusing section.
3) Remove the lower heat roller unit (B).
4) Remove the C-ring and the bearing (A), and remove the heat
roller (B).
h. Paper guide
1) Remove the fusing unit from the machine.
2) Remove the screw, and remove the paper guide.
Note: Refer to the adjustment (ADJ13) when installing the paper
guide.
A
A
B
Frame R
Frame F
Frame R
Frame F
A
B
B
A
A
B
AR-C172M DESCRIPTIONS OF EACH SECTION 7 - 6
i. Paper exit roller
1) Remove the fusing unit from the machine.
2) Open the upper fusing section.
3) Remove the E-ring (A), and shift the bearing (B).
4) Remove the paper exit roller unit (C).
5) Remove the E-ring, the gear, the pin, and the bearing.
j. Lower separation pawl
1) Remove the fusing unit from the machine.
2) Open the upper fusing section.
3) Remove the paper exit roller unit.
4) Lift the separation pawl and shift it to the right and lift it from
the heat roller.
5) Remove the POD1 connector.
6) Remove the screw, and slide and remove the lower separation
pawl mounting plate.
7) Rotate the separation pawl in direction A and remove if from
the mounting plate. Remove the spring.
Note: When attaching the separation pawl, check that the separa-
tion pawl is in contact with the heat roller.
A
B
C
C
A
B
C
A
AR-C172M DESCRIPTIONS OF EACH SECTION 7 - 7
2. Transfer section
A. Operational descriptions
(1) Outline
This section functions and operates as follows:
1) A high, positive voltage is applied to the transfer roller to
charge the transfer belt and paper on it positively, attracting
negatively charged toner images on the OPC drum onto
paper.
negatively charged toner images on the OPC drum onto
paper.
(2) Electrical and mechanical sections
(20pin)
(14pin)
12
13
7
8
9
14
1
4
5
6
3
10
16
17
15
20
18
19
11
13
1
5
7
3
9
12
10
8
FG
1
2
5
6
3
4
BTM B/
BTM A/
+24V
+24V
BTM B
BTM A
1
2
5
6
3
4
BLUM B/
BLUM A/
+24V
+24V
BLUM B
+5V
BLUD
GND2
BLUM A
1
2
5
3
4
CN9
(24pin)
(24pin)
CN17
(28pin)
(28pin)
DSNRout
DSWR
CN6 (10pin)
14
2
6
4
21
12
13
10
22
24
8
5
11
9
7
1
3
3
5
7
9
8 10
2
4
6
PCU PWB
CALS/
+24V
PCSC
GND2
B SEN LED
REG SEN
+5V
NC
BTNF
CALS/
GND2
GND2
PCS_C
ASEN_LED
GND2
REGSEN
TS (CL)
BTM /B
BTM /A
BTM B
BTM A
+24V
GND (FLAME)
BSEN_LED
PCS_K
PCSK
A SEN LED
GND2
BTN F
GND2
1
2
8
7
4
3
6
5
2
1
1
5
4
2
8
7
6
4
5
6
7
8
9 10
1 2
3
30 34
+24V
(4pin)
CN1 (8pin)
CN2 (10pin)
HV (MC) PWB
PCSC
PCSK
CALS
BTM
BLUM
BLUD
BTNF
Drive gear
Lift-up cam
Process control
shutter
shutter
Drawer connector
(24pin)
(24pin)
1
2
5
6
3
4
7
8
9
10
HV (TC) PWB
THVY
THVM
THVC
THVK
CN1 (10pin)
+24V
HVREM
TCC
TCM
TCY
TCK
GND
FG
FG
(NC)
HV REM
+24V
(NC)
FG
TC K
TC Y
TC M
TC C
HV REM
GND
FG
HV CLK
HV DATA
HV STB
GND2
GND2
+24V
BTNF
NC
CALS/
BELT CHim
A SEN LED
PCSK
GND2
PCSC
B SEN LED
GND2
REG SEN
+5V
BTM B/
BTM A/
BTM B
BTM A
+24V
(5pin)
(2pin)
1
2
(6pin)
(5pin)
Transfer belt unit
Color PC &
Auto reg
sensor
Auto reg
sensor
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