Sharp Mx 2300n Service Manual

							MX-2300/2700 N/G  TRANSFER SECTION  L – 9
4. Maintenance
✕: Check (Clean, replace, or adjust according to necessity.) {: Clean ▲: Replace U: Adjust ✩: Lubricate †: Shif the position.
No. Parts nameMonochrome 
supply, 
mechanical 
partsWhen 
calling100
K200
K300
K400
K500
K600
K700
K800
K900
K1000
K11 0 0
K1200
KRemark/Refer to the 
Parts Guide.
Block/Item No. (Only 
the replacement parts 
are described.)
1 Intermediate 
transfer beltMechanism 
parts✕ ▲▲▲▲▲▲▲▲▲ ▲ ▲ ▲(P/G No.: [26]-3)
2 Primary transfer 
roller✕✕✕▲✕✕▲✕✕▲✕✕▲(P/G No.: [27]-9)
(P/G No.: [28]-27)
3 Intermediate 
transfer blade✕ ▲▲▲▲▲▲▲▲▲ ▲ ▲ ▲(P/G No.: [25]-19)
4 Belt drive gear✕ ▲▲▲▲▲▲▲▲▲ ▲ ▲ ▲(P/G No.: [27]-13)
5 Primary transfer 
conduction collar✕ ▲▲▲▲▲▲▲▲▲ ▲ ▲ ▲(P/G No.: [27]-8)
(P/G No.: [28]-25)
6 Transfer drive roller{{{{{{{{{ { { {
7 Transfer follower 
roller{{{{{{{{{ { { {
8 Tension roller{{{{{{{{{ { { {
9 Belt CL brush✕✕✕✕✕✕✕✕✕ ✕ ✕ ✕
10 Y auxiliary roller{{{{{{{{{ { { {
11 Registration 
backup roller✕✕✕✕✕✕✕✕✕ ✕ ✕ ✕
12 Secondary transfer 
belt✕✕✕▲✕✕▲✕✕▲✕✕▲(P/G No.: [30]-21)
13 Secondary transfer 
roller✕✕✕▲✕✕▲✕✕▲✕✕▲(P/G No.: [30]-6)
14 Secondary belt 
drive roller✕✕{✕✕{✕✕{✕✕{
15 Secondary belt 
tension roller✕✕{✕✕{✕✕{✕✕{
16 Secondary belt 
follower roller✕✕{✕✕{✕✕{✕✕{
17 Secondary transfer 
idle gear✕✕✕▲✕✕▲✕✕▲✕✕▲(P/G No.: [29]-6)
18 Primary CL roller▲▲▲▲▲▲▲▲▲ ▲ ▲ ▲(P/G No.: [26]-56)
19 Cleaner seal✕ ✕✕✕✕✕✕✕✕✕ ✕ ✕ ✕
20 Cleaner seal R✕ ✕✕✕✕✕✕✕✕✕ ✕ ✕ ✕
21 Transfer toner 
reception seal✕ ✕✕✕✕✕✕✕✕✕ ✕ ✕ ✕
51
4
21
12
17
10
8
8
7
7
6
15
16
14
1513,17
16
4,6
102,5
1193
13
11
9
142
3
18
1920
19 
						

							MX-2300/2700 N/G  PROCESS CONTROL SENSOR, REGISTRATION SENSOR SECTION  M – 1 MX2700N
Service Manual [M] PROCESS CONTROL SENSOR, REGISTRATION SENSOR SECTION
1. Electrical and mechanism relation diagram
2. Operational descriptions
A. Process control sensor control
The shutter is provided on the monochrome (PCS_K) and color
(PCS_CL) process control sensor. When the shutter is opened (the
image density is corrected), the toner patch formed on the transfer
belt is scanned by the process control sensor and the information is
passed to the PCU.
When the shutter is closed, the gray resin section on the back of
the shutter is scanned to perform calibration of the sensor itself. 
The shutter operation is controlled by the process control shutter
solenoid (PCSS). 
B. Registration sensor control
The registration sensor is attached to the F side (REGS_F) and the
R side (REGS_R). When the shutter is opened, the registration
image formed on the transfer belt is scanned by the sensor and the
information is passed to the PCU.
Signal name Name Function/Operation
PCS_CL/K Process control sensor Detects the toner patch density.
PCSS Process control shutter solenoid Opens/closes the shutter of the process control and the registration sensor. 
REGS_F/R Resist sensor Detects the resist shift.
PCSS
PCS_CL/K
REGS_FREGS_R
CN17
RESI SENSOR F PROCON SENSORRESI SENSOR R RSM2P P
RSM18PP B32B-PHDSS-BDF11-6DP-SP1
/PCSS24V3
PCS_LED#5VNPDD-GND14 15
5VNPDD-GND REGS_F
REGS_F_LED#
5VNPDD-GND PCS_CL
PCS_K9 10 11 122
1/PCSS
24V32
1
4
3
2
15VNPD
D-GND
REGS_R
REGS_R_LED#
PCS_LED# 5
4
3
2
15VNPD
D-GND
PCS_CLPCS_K
REGS_F
REGS_F_LED#
4
3
2
15VNPD
D-GND
1 2 3 4 5 6 7
8
1 20 REGS_F
25 D-GND22REGS_F_LED#
REGS_R24REGS_R_LED#
23 5VNPD27 D-GND26
2 3 4 5 6 7 8 9 10 11 12 13 14 15
13
REGS_R
REGS_R_LED#
19
PCS_K18 PCS_LED#
21 PCS_CL
28 D-GNDPCU PWB
1
5
6
2
3
4
17 /PCSS16 24V3
5VNPD 5VNPD 5VNPD 5VNPD 5VNPD 5VNPD 
						

							MX-2300/2700 N/G  PROCESS CONTROL SENSOR, REGISTRATION SENSOR SECTION  M – 2
3. Disassembly and assembly
A. Process control sensor, registration sensor 
section
(1) Process control sensor unit
1) Remove the developing unit (K).
2) Remove the drum unit (K).
3) Remove the primary trasnfer unit.
4) Remove the paper feed tray 1.
5) Remove the rear cabinet.
6) Remove the ADU connection drive.
7) Remove the resist roller unit.
8) Disconnect the connector. Remove the screws. Release the
pawl, then remove the process control sensor.a. Resist sensor
b. Process control sensor
1) Remove the process control sensor unit.
2) Push up the shutter operation plate, and clean the registration
sensor (A) and the process control sensor (B). 
c. Process control shutter solenoid
1) Remove the process control sensor unit.
2) Remove the screw, slide the sensor mounting stay, and
remove the sensor mounting stay. 
3) Remove the screws. Disconnect the connector, and remove
the process control shutter solenoid.
* When installing, engage the process control shutter solenoid
with the groove in the shutter mounting plate (A). 
Unit Parts Maintenance
(1) Process 
control 
sensor unita Resist sensor✕{
b Process control sensor✕{
c Process control shutter 
solenoid
(1)-a
(1)-a
(1)
(1)-c
(1)-bA
AB
A 
						

							MX-2300/2700 N/G  PROCESS CONTROL SENSOR, REGISTRATION SENSOR SECTION  M – 3
4. Maintenance
✕: Check (Clean, replace, or adjust according to necessity.) {: Clean ▲: Replace U: Adjust ✩: Lubricate †: Shif the position.
No. Parts nameMonochrome 
supply, 
mechanical 
partsWhen 
calling100
K200
K300
K400
K500
K600
K700
K800
K900
K1000
K11 0 0
K1200
KRemark/Refer to the 
Parts Guide. Block/
Item No. (Only the 
replacement parts are 
described.)
18 Sensors 
(Process 
control resist 
sensors)Mechanism 
parts✕{{{{{{{{{ { { {
18 
						

							MX-2300/2700 N/G  FUSING SECTION  N – 1 MX2700N
Service Manual [N] FUSING SECTION
1. Electrical and mechanism relation diagram
Signal name Name Function/Operation
RTH1 Fusing temperature sensor (1) Detects the surface temperature of the fusing roller (heating). (Center section)
RTH2 Fusing temperature sensor (2) Detects the surface temperature of the fusing roller (heating). (Edge section)
HLTS1 Thermostat (1) Shuts conduction to the heater lamp when the temperature rises abnormally. [For the fusing roller (heating)]
HLTS2 Thermostat (2) Shuts conduction to the heater lamp when the temperature rises abnormally. [For the fusing roller (heating)]
HL_UM Heater lamp (1) Heats the fusing roller (heating).
CN2CN4
INT24V16 D-GND5
B03P-VL-KHLOUT_LM4 HLOUT_US3 CN3
2 /HLPR1
B6P-PH-K-S B03P-VL-R SM18PIN RP
CN9
25CN34
/HLPR
5277 9
2911D-GND326 D-GND
INT24V11
B30B-PHDSS-BB40B-PADSS-B DF11-4DP-SP1(PASTEL)
HLOUT_UM
2L-HL(COM) 1
N-HL(MAIN)
1L-HL(COM)
3L-HL(COM) 12TH_UM_IN
3 2 14
TH_LM_IN 15
D-GND
D-GND D-GND D-GND D-GND
4
3
2
1
13
12 14 1513
TH_US_IN
30
PCU PWB
TH_UMCS_INHLOUT_UMHLOUT_US HLOUT_LM
TH_US_IN TH_LM_IN
N-HL(SUB) N-HL(LOW)
HL PWB
TH_UM_IN
16
TH_UMCS_IN16
FUM
DRAWER RWZ1N-HL(MAIN)
4
L-HL(COM)
3 N-HL(LOW)6 L-HL(COM) L-HL(COM)
2 N-HL(SUB)5 4
1
5
2
6
3
1 TH_UM_IN 99 TH_UMCS_IN 1
2 D-GND 8
3 TH_US_IN 7
4 D-GND 6
5 TH_LM_IN
5
6 D-GND 4
PHNR-4-H +
BU04P-TR-P-HPHNR-3-H +
BU03P-TR-P-H
TH_US_IN 4
D-GND 3 1
2TH_UMCS_IN 2
D-GND3 TH_UM_IN
1 2
1
3
PHNR-2-H +
BU02P-TR-P-H
TH_LM_IN 2 1
2 D-GND 1
HL_UM
HL_USRTH3
HLTS3 HLTS11
2 HLTS2
RTH2
HL_LM
RTH1
2
3 
						

							MX-2300/2700 N/G  FUSING SECTION  N – 2
2. Operational descriptions
A. Fusing unit drive
To drive the fusing unit, the drive power is transmitted from the
drive motor (FUM) through the connection gear to the upper heat
roller gear.
The drive motor (stepping motor) is driven according to the control
signal sent from the PCU.
B. Heater lamp drive
The surface temperature of the heat roller detected by the ther-
mistor is sent to the PCU. When the temperature is lower than the
specified level, the heater lamp lighting signal is sent from the PCU
to the heater lamp drive circuit in the sub power PWB.
The power triac in the heater lamp drive circuit is turned on, and the
AC power is supplied to the heater lamp, lighting the lamp and
heating the heat roller.
To prepare for an abnormally high temperature of the heat roller,
the thermostat is provided for safety.
When the thermostat is opened, power supply (AC line) to the
heater lamp is cut off.
C. Fusing operation
Color toner of YMCK on paper is heated and pressed by the heat
rollers to be fused on paper.
At that time, color toner of YMCK is mixed to reproduce nearly
actual colors of document images.The upper and the lower heat rollers are provided to heat from
above and below.
This is because it is necessary to heat four layers of toner from
above and below and right and left to fuse it on paper.
The upper and lower heat rollers are of silicon rubber.
This is because of the following reasons:
1) To provide a greater nip quantity and a higher heating capacity
for paper.
2) The soft, flexible rollers press multi-layer toner without defor-
mation to fuse on paper.
3) An even pressure is applied to an uneven surface of multi-
layer toner.
D. Fusing temperature control
The temperature sensors are provided at the center and the edges
of the upper heat roller, and at the center of the lower heat roller. 
The heat roller temperature is detected by the temperature sensors
to control the heater lamp so that the temperature is maintained at
the specified level.
The fusing temperature is switched according to the machine con-
dition and paper type selected.
HL_US Heater lamp (2) Heats the fusing roller (heating).
RTH3 Fusing temperature sensor (3) Detects the surface temperature of the fusing roller (heating).
HLTS3 Thermostat (3) Shuts conduction to the heater lamp when the temperature rises abnormally. [For the fusing roller (heating)]
HL_LM Heater lamp (3) Heats the fusing roller (heating).
FUM Fusing motor Drives the fusing unit.
No. Name Function/Operation
1 Fusing roller (Heating) Heat and presses toner on paper to fuse it on paper. 
2 Pawl Paper which was not separated naturally from the fusing roller (heating) is mechanically separated. 
3 Fusing roller (pressing) Heat and presses toner on paper to fuse it on paper.  Signal name Name Function/Operation
FUM PCU
Mode PaperFusing 
roller center 
(heating) 
mainFusing 
roller 
(heating) 
subFusing 
roller 
(pressing)
Ready state
Print modeB/W normal 
paper170 180 130
Color normal 
paper170 180 130
Heavy paper 170 175 140
OHP 170 170 145
Envelope 180 180 145 
						

							MX-2300/2700 N/G  FUSING SECTION  N – 3
3. Disassembly and assembly
A. Fusing section
(1) Fusing unit
1) Open the right door unit.2) Release the lock lever, and remove the fusing unit.
a. Upper thermostat
1) Remove the fusing unit.
2) Remove the screws and the fusing upper cover.
3) Disconnect the connector, and remove the upper thermostat.
b. Upper thermistor
1) Remove the fusing unit.
2) Remove the screws and the fusing upper cover.
Unit Parts Maintenance
(1) Fusing unit a Upper thermostat
b Upper thermistor✕ ▲
c Non-contact thermistor✕
d Lower thermostat
e Lower thermistor✕ ▲
f Upper heater lamp main
g Upper heater lamp sub
h Lower heater lamp
i Upper heat roller✕ ▲
j Upper heat roller gear✕ ▲
k Upper heat roller bearing✕ ▲
l Lower heat roller gear✕ ▲
m Lower heat roller bearing✕ ▲
n Upper separation pawl✕ ▲
(1)-d
(1)-h (1)-a
(1)-g
(1)-f
(1)-e(1)-m (1)-k
(1)-k(1)-n(1)-j
(1)
(1)-l
(1)-m
(1)-a
(1)-b
(1)-i
(1)-c
1
2
1
1
2 
						

							MX-2300/2700 N/G  FUSING SECTION  N – 4 3) Disconnect the connector, and remove the upper thermistor.
c. Non-contact thermistor
1) Remove the fusing upper cover.
2) Remove the screws, and remove the cover. Remove the con-
nector and the screws, then remove the non-contact ther-
mistor.
d. Lower thermostat
1) Remove the fusing unit.
2) Remove the fusing lower cover.
3) Disconnect the connector, and remove the lower thermostat.e. Lower thermistor
1) Remove the fusing unit.
2) Remove the fusing lower cover.
3) Disconnect the connector, and remove the lower thermistor.
f. Upper heater lamp main
g. Upper heater lamp sub
1) Remove the fusing unit.
2) Release the pressure release lever, and remove the fusing
upper cover F.
3) Tilt the lock lever, and remove the fusing upper cover R.
4) Disconnect the connector.
1
2
2
1 
						

							MX-2300/2700 N/G  FUSING SECTION  N – 5 5) Remove the lamp holder, and remove the lamp.
* Since the connector shape on the front side differ from that
on the rear side, be careful when installing.
Install so that the red harness is on the rear side. 
h. Lower heater lamp
1) Remove the fusing unit.
2) Remove the fusing upper cover F.
3) Remove the fusing upper cover R.
4) Disconnect the connector, and remove the lamp holder.
5) Remove the lower heater lamp.
* Since the connector shape on the front side differ from that
on the rear side, be careful when installing.
Install so that the red harness is on the rear side. 
i. Upper heat roller
j. Upper heat roller gear
k. Upper heat roller bearing
1) Remove the fusing unit.
2) Remove the upper heater lamp.
3) Remove the fusing rear upper PG.4) Release the pressure.
5) Open the fusing unit.
6) Remove the upper heat roller unit, and remove the parts.
l. Lower heat roller gear
m. Lower heat roller bearing
1) Remove the fusing unit.
2) Remove the lower heater lamp.
3) Release the pressure, and open the fusing unit.
4) Remove the lower heat roller unit, and remove the parts 
						

							MX-2300/2700 N/G  FUSING SECTION  N – 6 n. Upper separation pawl
1) Remove the fusing unit.
2) Remove the fusing rear upper PG.
3) Remove the spring, and remove the upper separation pawl.
1
2