Sharp AR-M550 (serv.man12) Service Manual ▷ View online
AR-M550/M620 DETAILS OF EACH SECTION 6 - 80
a-7. Process adsorption plate
1) Remove the drum unit.
2) Remove the cover to remove the adsorption plate.
a-8. Drum separation pawl solenoid
1) Disconnect the connector, and remove the harness guide unit.
2) Remove the drum separation pawl solenoid.
a-9. OPC drum cleaner temperature sensor
1) Remove the upper cover.
2) Remove the OPC drum cleaner temperature sensor.
a-10. Discharge lamp
1) Remove the upper cover. (See “a-9. OPC drum cleaner tempera-
ture sensor” in this section)
2) Remove the discharge lamp.
AR-M550/M620 DETAILS OF EACH SECTION 6 - 81
a-11. Image density sensor
1) Remove the upper cover. (See “a-9. OPC drum cleaner tempera-
ture sensor” in this section)
2) Disconnect the connector.
3) Remove the OPC drum unit. (See “a-1. OPC drum” in this section)
4) Remove the image density sensor.
a-12. OPC drum marking sensor
1) Remove the OPC drum unit. (See “a-1. OPC drum” in this section)
2) Remove the OPC drum marking sensor.
AR-M550/M620 DETAILS OF EACH SECTION 6 - 82
[Transfer section]
A. General
In this section, toner images on the OPC drum are transferred to
paper.
paper.
B. Major parts and signal functions
Code
Signal
name
Name
Function/Operation
Type
Note
DM
DM
OPC drum motor
Drives the OPC drum and the
transfer section.
transfer section.
DC brushless motor
TURM
TURM
Transfer separation motor
Drives and separates the transfer
belt.
belt.
DC brush motor
The transfer belt is pressed on
the OPC drum only during
printing.
the OPC drum only during
printing.
THPS2
THPS2
Transfer belt contact/separation
home position sensor 2
home position sensor 2
Transfer belt separation home
position detection 2
position detection 2
Transmission type
Not used.
THV
THV
Transfer high voltage
High voltage for transfer
HUS-TC
HUS-TC
Process humidity sensor
Process peripheral humidity
detection
detection
Humidity sensor
Analog detector
(Not used)
(Not used)
5
4
3
2
1
12
11
10
9
8
7
6
5
4
3
2
1
13
14
15
16
17
18
14
15
16
17
18
PCU
PWB
PWB
GND2
/DM
DMCLK
DM-T
DM-T
S5B-PH-K-S
+5V2
2
1 +38V
B2PS-VH
GND1
B1v8B-PHDSS-B
CN-6
GND2
/DM
DMCLK
DM-T
+5V2
GND2
/DVM
DVMCLK
DVM-T
+5V2
GND2
+5V2
/FUM
FUMCLK
FUM-T
+24V1
GND2
/VFM-BKR
AC PWB
11
10
12
14
15
16
14
15
16
+38V
+38V
GND1
GND1
+38V
GND1
CN-5
B16B-PADSS-1
DM
CN-8
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1 PCS-LED
PCS
DMS-LED
DMS
/DL
/PTDL
/PTDL
/PSPS
HUS-TC
GND2
TH-CL
GND2
TLS
GND2
B20B-PHDSS-B
(NC)
+24V1
+5V2
+24V1
+12V2
+12V2
+24V-DL
+12V2
+24V-DL
10
9
8
7 MHV-T
/THV+PWM
/CHV-PWM
THV+REM
CN-15
B34B-PHDSS-B
B34B-PHDSS-B
9
8
7
6
THV
HV
CN-1
B16B-PH-K-S
MHV-T
/THV+PWM
/THV+PWM
/CHV-PWM
THV+REM
FPS-187(WH)
1
2
4
3
1
8
4
5
6
7
3
2
6
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
1
9
8
7
6
5
4
3
2
25
26
27
28
29
30
31
32
26
27
28
29
30
31
32
9
8
7
6
5
4
3
2
1
9
8
7
6
5
4
3
2
1
20
19
18
17
16
15
14
13
12
11
10
20
19
18
17
16
15
14
13
12
11
10
24
23
22
21
24
23
22
21
25
26
27
28
29
30
31
32
26
27
28
29
30
31
32
25
26
27
28
29
30
31
32
26
27
28
29
30
31
32
B32B-PHDSS-B
+24V1
GND2
+24V1
/RRC
(NC)
+24V(DSW)
+24V1
+5V-APPD1
+5V-APPD2
+5V-PFD2
+5V-DSWD
+5V-AINPD
+5V-THPS1
+5V-THPS2
PFD2
THPS1
THPS2
TURM
/SFM
APPD1
APPD2
AINPD
/CFM-AM1
DSWD
/DGS
(NC)
DSW-L
DSW-L
CN-7
GND2
GND2
GND2
(NC)
(NC)
DRAWER
QR/P4-32S-C(01)/QR/P4-32P-C(01)
/CFM-DV
TURM
THPS2
/ADUM2/A
/ADUM2A
/ADUM2B
/ADUM2/B
/ADUM2A
/ADUM2B
/ADUM2/B
/ADUM1/A
/ADUM1A
/ADUM1B
/ADUM1/B
/ADUM1A
/ADUM1B
/ADUM1/B
+5V-APPD1
+5V-APPD2
+5V-APPD2
+5V-AINPD
GND2
APPD1
APPD2
AINPD
APPD1
APPD2
AINPD
/DGS
+24V2
+24V2
+24V(DSW)
(NC)
+24V1
GND2
TURM
DSW-L
+5V-PFD2
+5V-THPS2
PFD2
THPS2
/TCB-PWM
DSW-ADU
+5V-DSW
/CFM-ADU
/TCBIAS
LEFT DOOR UNIT
8
7
6
5
4
3
2
1
9
10
11
12
11
12
8
7
6
5
4
3
2
1
9
10
11
12
11
12
3
2
1
SMR-12V-N/SMP-12V-NC
GND2
179228-3
THPS2
+5V-THPS2
2
1
GND2
PHR-2
TURM
+5V-PFD2
THPS2
PFD2
+5V-THPS2
+5V-THPS2
DSW-L
DSW-L
DSW-L
+24V1
GND2
TURM
TURM
/TCB-PWM
/CFM-ADU
/TCBIAS
7
5
4
3
2
1
6
B6B-PH-K-S
DSW-L
DSW-L
DSW-L
GND2
F-GND
F-GND
/TCB-PWM
Bias
FPS-187
TB PWB
/TCBIAS
No.
Name
Operation
1
Transfer roller (Drive)
Drives the transfer belt.
2
Transfer cleaning roller
Cleans the transfer belt.
3
Transfer belt
Transfers toner images from the OPC drum to paper.
4
Transfer tension roller
Applies a proper tension to the transfer belt.
5
Transfer belt discharge brush
Connects the transfer belt to the chassis ground.
6
Transfer roller
Applies a transfer voltage to the transfer belt.
7
Transfer roller (Idle)
Helps to stretch the transfer belt.
8
Transfer (TCCL) bias high voltage PWB
Generates a bias voltage for the transfer cleaning roller in cleaning or in the print mode.
AR-M550/M620 DETAILS OF EACH SECTION 6 - 83
C. Operational descriptions
1) Toner image transfer
Toner images formed on the drum by the developing roller are trans-
ferred to paper by the transfer belt.
ferred to paper by the transfer belt.
Toner on the drum is negatively charged by stirring in the developing
unit. By applying a positive voltage to the transfer roller, the transfer
belt and paper on the transfer belt are positively charged to transfer
negatively charged toner images to paper.
unit. By applying a positive voltage to the transfer roller, the transfer
belt and paper on the transfer belt are positively charged to transfer
negatively charged toner images to paper.
2) Transfer belt cleaning
During the job, a positive voltage is applied to the transfer cleaning
roller so that negatively charged toner on the transfer belt is attracted
to the cleaning roller.
roller so that negatively charged toner on the transfer belt is attracted
to the cleaning roller.
(The brush on the back of the transfer belt is provided for increasing
the cleaning effect.)
the cleaning effect.)
After completion of the job, the applied voltage to the transfer cleaning
roller is switched to negative, and toner is returned from the transfer
cleaning roller to the transfer belt, and toner on the transfer belt is
attracted to the drum and cleaned by the cleaning blade.
roller is switched to negative, and toner is returned from the transfer
cleaning roller to the transfer belt, and toner on the transfer belt is
attracted to the drum and cleaned by the cleaning blade.
Cleaning timing:
• After completion of the job,
• When warming-up.
• After canceling a jam
• After execution of process control
3) Transfer belt separation/contact
Transfer belt is separated by the transfer separation motor.
The transfer belt is in contact with the drum except for the following
cases:
cases:
• When executing process control (to prevent against breakage of
toner patch on the drum)
• When a jam occurs (Protection of the drum, left door open/close)
• When shipping (Protection of the drum. Separate with the simulation
6-1 (7).)
-2.0kv
Cleaning roller
cleaning mode
cleaning mode
Cleaning mode
Transfer belt
cleaning mode
cleaning mode
Transfer
mode
mode
2.0kv
10
Ω
8
-100v
AC4.5kv
(35
µ
A)
1.5~2.0kv
-2.0kv
2.0kv
-2.0kv
-100v
AC4.5kv
2.0kv
(35 A)
1.5~2.0kv
10
Ω
8
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