AR-M550 (serv.man12). (6b) Laser scan unit, Image process section, Scanner section, Fusing section, SPF section - Sharp Copying Equipment Service Manual (repair manual). Page 10

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AR-M550/M620  DETAILS OF EACH SECTION  6 - 69
[Developer tank section]
A. General
In this section, toner is attached to electrostatic latent images formed
by laser beams on the OPC drum, making visible images.
B. Major parts and signal functions
Code
Signal 
name
Name
Function/Operation
Type
Model
Note
HUS-DV
HUS-DV
Developing humidity sensor
Developing section peripheral humidity 
detection
Humidity sensor
Analog detector
TCS
TCS
Toner density sensor
Toner density detection
Magnetic sensor
Analog detector
TH-DV
TH-DV
Developing temperature sensor
Developing section temperature detection Thermistor
Analog detector
DVM
DVM
Developing motor
Drives the developing section.
DC brushless motor
Bias
Bias
Developing bias
High voltage for developing bias
12
11
10
9
8
7
6
5
4
3
2
1
13
14
15
16
17
18
B18B-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
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
4
3
2
1
4
3
2
1
PCU PWB
AC PWB
HV
GND2
DVCH1
DVCH2
DVCH3
GND2
DV-Bias
GND2
TCS
GND2
DVCH4
TCS
GND2
(NC)
(NC)
(NC)
+24V1
HUS-DV
+24V1
51021-0400
DEVELOPER UNIT
DVM
HUS-DV 
TH-DV
TCS
DRAWER
+5V2
Bias
PS-187(GR)
DVREM
CN1
TH-DV
TSGOUT
TH-DV
(NC)
(NC)
(NC)
TSGOUT
TH-DV
+5V2
HUS-DV
GND2
ZHR-4
GND2
HUS-DV
MPRD2
GND2
+5V2
+5V-MPRD2
MPRD1
+5V-MPRD1
GND2
TSGOUT
GND2
TCS
+24V1
GND2
PPD
+5V2
DVCH4
DVCH3
DVCH2
DVCH1
+24V1
/PSBC
+24V1
+24V1
/T2PFC
+24V1
/HPFC
CN-12
B30B-PHDSS-B
SRA-01T-3.2
QR/P8-20S-C(01)/QR/P8-20P-C(01)
/HPLS
5
4
3
2
1
2
1
+38V
GND1
GND2
/DVM
DVMCLK
DVM-T
B2PS-VH
S5B-PH-K-S
+5V2
11
10
12
14
15
16
+38V
+38V
GND1
GND1
+38V
GND1
CN-5
B16B-PADSS-1
1
2
3
5
1
3
2
5
4
14
17
16
15
CN-15
/DVPWM
/DVREM
HVREM
+24V1
B34B-PHDSS-B
No.
Name
Operation
1
Developing roller
Forms magnetic brush with developer and put toner on the OPC drum.
2
DV doctor
Keeps the height of the magnetic brush on the developing roller at a fixed level.
3
Mixing roller
Mixes developer (carrier and toner) and charges toner negatively.
4
DV earth plate
Earth plate for DV unit
5
AG roller
Mixes toner supplied from the toner hopper, and supplies toner to the DV box evenly.
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