Sharp Mx 2300n Service Manual

							MX-2300/2700 N/G  DEVELOPING SECTION  K – 4
4) Take out the old developer, and insert the new developer.
* When replacing developer, use an extreme care not to drop
developer on the drive section (marked with {).
(Note for cleaning the developing unit)
If the developing unit is cleaned with a cleaner or an air blower
with much developer in the developing unit, static electricity
may be accumulated in the unit. In order to prevent against
this, note the following items.
* If metal part is brought into contact with the magnet roller surface
when transporting developer or removing foreign material from
the magnet roller, developer may adhere to the magnet roller sur-
face. Be careful to avoid this when handling the magnet roller.
* Remove developer in the developer unit as well as developer
attached to the magnet roller as far as possible.
(When cleaning the developing unit with an air blower [duct])
* Before cleaning with an air duct, remove developer from the unit
as far as possible, and ground the magnet roller rear side cored
bar as shown in the figure below and clean the unit with an air
blower. (Do not pinch the grounding wire with a crocodile clip
connector in order to prevent against damage on the cored bar.)* When supplying developer, do not tilt the developing unit.
b. DV seal
c. DV side seal F
d. DV side seal R
1) Remove the old DV seal (A), DV side seal F (B), R (C).
2) Attach the new DV seal (A), DV side seal F (B), DV side seal R
(C) to the reference position.
* When attaching, arrange so that the DV side seal F (C) and the
DV side seal R (D) are placed between the DV cover R (A) and
the DV blade (B).
1
Magnet roller
rear side cored bar
AB
C
1
00.3mm:*
00.3mm
:*
00.3mm
:* 00.3mm
:*
00.5mm
:*
A
BC00.3mm
:*
A
B
C
D
: Dec. 15 20051 
						

							MX-2300/2700 N/G  DEVELOPING SECTION  K – 5 e. DV initial PWB
f. Density sensor
1) Remove the developing unit.
2) Remove the screw, and remove the DV guide. Disconnect the
connector, and remove the DV initial PWB (A).
Remove the screw, and diisconnect the connector, and
remove the density sensor (B).g. Toner filter
1) Remove the developing unit.
2) Remove the toner filter cover and the toner filter.
4. Maintenance
✕: Check (Clean, replace, or adjust according to necessity.) {: Clean ▲: Replace U: Adjust ✩: Lubricate †: Shif the position.
A
B
No. Parts nameMonochrome 
supply, 
mechanical 
partsWhen 
calling100
K200
K300
K400
K500
K600
K700
K800
K900
K1000
K1100
K1200
KRemark: Refer to the 
Parts Guide. Block/
Item No. (Only the 
replacement parts are 
described.)
Color supply60
K120
K180
K240
K300
K360
K
1 Developer (BK) Monochrome 
supply▲▲▲▲▲▲▲▲▲ ▲ ▲ ▲
2 DV seal (BK)▲▲▲▲▲▲▲▲▲ ▲ ▲ ▲(P/G No.: [23]-42)
3 DV side seal F 
(BK)▲▲▲▲▲▲▲▲▲ ▲ ▲ ▲(P/G No.: [23]-26)
4 DV side seal R 
(BK)▲▲▲▲▲▲▲▲▲ ▲ ▲ ▲(P/G No.: [23]-15)
5 Toner filter▲▲▲▲▲▲▲▲▲ ▲ ▲ ▲(P/G No.: [22]-37)
6 Developer (C) Color supply▲▲▲▲ ▲ ▲
7 Developer (M)▲▲▲▲ ▲ ▲
8 Developer (Y)▲▲▲▲ ▲ ▲
9 DV seal (C)▲▲▲▲ ▲ ▲(P/G No.: [23]-42) 
10 DV side sheal F, 
R (C)▲▲▲▲ ▲ ▲(P/G No.: [23]-26, 
[23]-15)
11 Toner filter▲▲▲▲ ▲ ▲(P/G No.: [22]-37)
12 Bias pin/
ConnectorMechanism 
parts✕ ✕✕✕✕✕✕✕✕✕ ✕ ✕ ✕
1,6,7,8
2,912
12
3,104,10
5,11
12 
						

							MX-2300/2700 N/G  TRANSFER SECTION  L – 1 MX2700N
Service Manual [L] TRANSFER SECTION
1. Electrical and mechanism relation diagram
Signal name Name Functions and operations
1TC_CMY Color trasnfer high voltage signal
1TC_K B/W transfer high voltage signal
1TNFD Waste toner full detection switch Waste toner full detection
1TUD_CL Transfer belt separation CL detection Color transfer roller position detection signal
1TUD_K Transfer belt separation BK detection B/W transfer roller position detection signal
1TURC Primary transfer separation clutch Transfer roller separation control clutch
2TC Secondary transfer high voltage signal
DVMK Developer drive motor (K) Transfer unit drive motor (Used together with the B/W developing drive roller)
WTNM Waste toner drive motor Stirs waste toner.
CN9
PHNR-3-H + BU03P-TR-P-H B30B-PHDSS-B
CN1 CN34
2-TC INT24V2 1
P-GND 2
CLR /TC_CLK# 4
/TC_DATA# 3
/TC_LD#
5
/HV_REM# 6
B6P-PH-K-S B40B-PADSS-B
B30B-PHDSS-B CN1
B6P-PH-K-SCN26 CN2
1TC_CL 3
HV_REM 7
MC_YMC 6
1TC_K 5
B32B-PHDSS-B 1TC_YMC 4
P-GND 2
INT24V2
1
B7P-PH-K-SCN1
INT24V2 7
1TC-KP-GND 6
1TC_YMC 4
1TC-CMY 1TC_K 3
MC_YMC 2
HV_REM 1
1TC_CL 5
B7P-PH-K-S
CN9
PHNR-3-H + BU03P-TR-P-H B30B-PHDSS-BHV_REM#6
5
4
3
2
1 /HV_DATA#
/HV_CLK#
/HV_LD1#INT24V2
P-GND
/HV_CLK#
/HV_LD1#
HV_REM# 20
21
22
23
24
2
4
6
8INT24V2
P-GND
/TC_CLK#
/TC_DATA# 2
1TUD_CL 11
1TUD_CL 12 1TUD_CL
1
3
5VLEDGND
9 13
12
14 5VLED 31 5VLED D-GND 23D-GND
5VLED 3 1TUD_K 1
D-GND 2
1 5VLED 21TUD_K
3D-GND2
1
35VLED 101TUD_K
D-GND
PCU PWB
2nd TC PWBMC PWB 1st TC PWB
/TC_LD#
/HV_REM# 10
12P-GND
/HV_DATA#
1TUD_CL
1TC_K
2TCDVMK 1TURC
1TNFD
WTNM 1TC_CMY
RSM18PINPCN9
P SL2PIN R1 1TNFD 1
2
17 D-GND 2
WTNM_1 1
WTNM_2 2 1
2D-GND 1TNFD
WTNM_1
18 WTNM_2 3 1TNFD 3
4 D-GND 4
5WTNM_15
6WTNM_26
1TUD_K
CN 12
PHNR-02-H + BU02P-TR-P-H
B32B-PHDSS-B24V3 2
2 /1TURC 1
116
14/1TURC24V3
1
79
410
11 12
13
25
8
3
6
3
14 
						

							MX-2300/2700 N/G  TRANSFER SECTION  L – 2
2. Operational descriptions
A. Outline
In this section, a high voltage is applied to transfer images to the
intermediate transfer belt and toner images on the intermediate
transfer belt are transferred to paper by the secondary transfer belt. 
B. Primary (intermediate) transfer roller 
separation mechanism and content
The primary transfer roller performs all pressure contact, all sepa-
ration, and only black contact depending on the operation mode. 
When the roller separation clutch (1TURC) is turned ON, the trans-
fer cam rotates and the primary transfer link and the primary trans-
fer arm which is linked with the cam are shifted in the arrow
direction, performing separation of the roller. 
The arm performs all pressure contact, all separation, and only
black contact.
The primary transfer and the secondary transfer are driven together
with the black developing motor. 
No. Name Functions and operations
1 Intermediate transfer blade Cleans residual toner on the intermediate transfer belt. 
2 Intermediate transfer belt Transfers toner on the OPC drum to form toner images on the belt. 
3 Primary transfer roller Transfers toner images on the OPC drum to the intermediate transfer belt. 
4 Transfer drive roller Drives the transfer belt. 
5 Transfer follower roller Transfer belt follower drive
6 Tension roller Applies a tension to the transfer belt. 
7 Roller cleaning brush Cleans the back surface of the transfer belt. 
8 Y auxiliary roller Retaining the belt position by separation of the Y transfer roller
9 Registration backup roller Retaining the belt position in the process control and the registration section. 
10 Secondary transfer belt Transfers toner images on the intermediate transfer belt to paper.
11 Secondary transfer roller Transfers toner images on the intermediate transfer belt to paper.
12 Secondary belt transfer roller Drives the transfer belt. 
13 Secondary belt tension roller Applies a proper tension to the transfer belt. 
14 Primary transfer CL roller Cleans the primary transfer belt. 
1TUD_CL 1TUD_K
All pressure contact ON OFF
All separation OFF ON
Only black contact OFF OFF
All pressure contact
Only black pressure contact All separation 
						

							MX-2300/2700 N/G  TRANSFER SECTION  L – 3
3. Disassembly and assembly
A. Primary transfer
(1) Primary transfer unit
1) Open the front cover.2) Open the right door unit.
3) Loosen the blue screw.
4) Turn the blue screw (A) counterclockwise. Making sure that
the lock is released (B), open and then pull out the drum posi-
tioning unit.
* Failure to complete this step may damage the intermediate
transfer belt.
5) Hold the specified position, and remove the primary transfer
unit. 
(NOTE) 
When the transfer belt tension of the primary transfer unit is
released manually, turn on the power again after completion of
the work. (Power OFF-ON) This procedure initializes the trans-
fer roller to return it to the home position.
Unit Parts Maintenance
(1) Primary 
transfer unita Intermediate transfer belt✕ ▲
b Primary transfer CL roller▲
c Intermediate transfer blade✕ ▲
d Primary transfer roller✕ ▲
e Primary transfer conduction 
collar✕ ▲
f Y auxiliary roller{
g Belt drive gear✕ ▲
h Transfer drive roller{
i Transfer follower roller{
j Tension roller{
k Roller cleaning brush✕
l Registration backup roller✕
m Cleaner seal✕
n Cleaner seal R✕
o Transfer toner reception seal✕
(2) Others a Transfer belt separation CL 
detection
b Transfer belt separation BK 
detection
(1)-e
(1)-l
(1)-g
(1)-c
(1)-o(1)
(1)-j(1)-i
(1)-a
(2)-a
(2)-b
(1)-f
(1)-d
(1)-h
(1)-k
(1)-b
(1)-m
(1)-n
A B 
						

							MX-2300/2700 N/G  TRANSFER SECTION  L – 4 a. Intermediate transfer belt
* Do not replace the belt, blade, and primary transfer CL roller sep-
arately. When any of the three parts needs to be replaced,
replace the other two parts as well.
* When replacing the belt, be sure to apply stearic acid (UKOG-
0312FCZZ) and strontium titanate according to the instructions.
1) Remove the primary trasnfer unit.
2) Remove the cleaner unit.
3) Remove the transfer guide plate left unit.
4) Remove the parts.
5) Fold the CL section of the transfer frame and remove the inter-
mediate transfer belt.
* When installing, set the lot number inside the belt to the front
side. 
[Precautions for installation]
When replacing the belt, make sure not to scratch or fold it.
Do not touch the surface of the belt with bare hands.
(Applying the start powder)
1) Install the primary transfer unit, laying it on the top surface.
* Make sure that the pressure on the CL roller has been
released.
2) Apply the side seal powder (stearic acid) uniformly on the sur-
face of the belt (Figure 1).
* Apply the side seal powder uniformly on half of the surfaces
on both sides of the belt.
* Rub the belt with a cloth bag containing the side seal powder
so that the powder will be applied onto the belt.
3) Turn the belt a 1/4 turn. (For the direction of the turn, see Fig-
ure 3.)
4) Apply strontium titanate uniformly on the surface of the belt.
* Apply strontium titanate evenly on the surface of the belt.
* Apply 20 times (5 times transversally x 4 times longitudinally,
see Figure 2).5) Turn the belt twice (in the direction described in step 3).
* There may be some traces of strontium titanate left on the
surface of the belt.
6) Turn the primary transfer unit over.
* Turn the unit over by lifting the cleaner unit side.
* Keep the primary transfer unit in a horizontal position (not to
lower the cleaner unit side) until it is installed on the
machine.
* Be sure not to allow strontium titanate to spread inside the
cleaner unit.
1
2
1
2345
AB-67
CL roller side
Apply strontium titanate all the way
beyond the boss.
Apply uniformly.Cleaner unit
side
Turn the unit over by lifting the
cleaner unit side.
[Figure 1]
[Figure 2]
[Bottom surface]
[Number of times of application][Figure 3]
CL roller side
[Never lower the cleaner unit side.] Cleaner
unit side 
						

							MX-2300/2700 N/G  TRANSFER SECTION  L – 5 b. Primary transfer CL roller
1) Remove the primary transfer unit.
2) Remove the transfer guide plate left unit.
3) Remove the screw, and remove the primary transfer CL roller
installation plate unit.
Remove the waste toner drive motor from the waste toner
drive unit.
* After assembling, check to confirm that it is not set at the
pressure release position.
c. Intermediate transfer blade
1) Remove the primary transfer unit, and put it upside down.
2) Remove the cleaner unit.3) Remove the transfer guide plate, and remove the intermediate
transfer blade.
* When installing, apply stearic acid onto the intermediate
transfer blade (A).
* Check the cleaner seal (B) and cleaner seal R (C). If any of
them is laid on the blade, replace it. (See step m for the
cleaner seal and step n for the cleaner seal R respectively.)
d. Primary transfer roller
e. Primary transfer conduction collar
f. Y auxiliary roller
1) Remove the primary trasnfer unit.
2) Remove the cleaner unit.
3) Remove the intermediate transfer belt.
4) Disengage the engagement on the front side, and remove the
primary transfer roller (A) and the primary transfer conduction
collar (B). Remove the Y auxiliary roller (C).
g. Belt drive gear
1) Remove the primary trasnfer unit.
2) Remove the cleaner unit.
3) Remove the screws, and remove the belt drive gear.
A
B
C
1
A
A
A
A
C
B
B
B
B
2
3 
						

							MX-2300/2700 N/G  TRANSFER SECTION  L – 6 h. Transfer drive roller
1) Remove the primary trasnfer unit.
2) Remove the cleaner unit.
3) Remove the intermediate transfer belt.
4) Clean the transfer drive roller.
i. Transfer follower roller
j. Tension roller
1) Remove the primary trasnfer unit.
2) Remove the cleaner unit.
3) Remove the intermediate transfer belt.
4) Clean the trasnfer follower roller (A) and the tension roller (B).
k. Roller cleaning brush
1) Remove the primary trasnfer unit.
2) Remove the cleaner unit.
3) Remove the intermediate transfer belt.
4) Check the roller CL brush.l. Registration backup roller
1) Remove the primary trasnfer unit.
2) Remove the cleaner unit.
3) Remove the intermediate transfer belt.
4) Check the registration backup roller. 
m. Cleaner seal
n. Cleaner seal R
1) Remove the primary trasnfer unit.
2) Remove the cleaner unit.
3) Remove the cleaner seal (A) and the cleaner seal R (B).
* When attaching the seals, position the seals within the spec-
ified ranges, referring to the reference lines as indicated
below.
o. Transfer toner reception seal
1) Remove the primary trasnfer unit.
2) Remove the cleaner unit.
3) Remove the transfer toner reception seal.
A
BAB
Reference line Reference line
0 - 0.3mm0 - 0.3mm 0 - 0.3mm
Reference line 
						

							MX-2300/2700 N/G  TRANSFER SECTION  L – 7 * When attaching the transfer toner reception seal, position
the seal within the specified ranges, referring to the refer-
ence lines as indicated below.
(2) Others
a. Transfer belt separation CL detection
b. Transfer belt separation BK detection
1) Remove the primary trasnfer unit.
2) Remove the developing unit.
3) Remove the drum unit.
4) Check the transfer belt separation CL detection (A) and the
transfer belt separation BK detection (B). 
B. Secondary transfer
(1) Secondary transfer unit
1) Open the right door unit.
2) Release the pawl, and remove the secondary transfer unit.
a. Secondary trasnfer idle gear
b. Secondary belt follower roller
c. Secondary transfer belt
1) Remove the secondary trasnfer unit.
2) Remove each parts, and remove the secondary drive plate.
Remove each parts, and remove the idle gear (A).
Unit Parts Maintenance
(1) Secondary 
transfer unita Secondary transfer idle gear✕ ▲
b Secondary belt follower roller✕{
c Secondary transfer belt✕ ▲
d Secondary transfer roller✕ ▲
e Secondary trasnfer belt drive 
roller✕{
f Roller cleaning brush✕
g Secondary belt tension roller✕{
Reference line
0 - 0.3mm
0 - 0.3mm
Reference line
AB
(1)-a
(1)-g (1)-f
(1)-b (1)-d(1)-e
(1)-c
(1)
1
2
1
1
2
3
3
1
2
3
A 
						

							MX-2300/2700 N/G  TRANSFER SECTION  L – 8 3) Remove the secondary belt transfer frame.
4) Remove each parts, and remove the secondary follower roller.
5) Remove the secondary transfer belt.
d. Secondary transfer roller
1) Remove the secondary trasnfer unit.
2) Remove the secondary transfer belt.
3) Remove the bearing on the front side, and remove the second-
ary transfer roller. e. Secondary belt drive roller
1) Remove the secondary trasnfer unit.
2) Remove the secondary transfer belt.
3) Remove each parts, then remove the secondary belt drive
roller.
f. Roller cleaning brush
1) Remove the secondary trasnfer unit.
2) Remove the secondary transfer belt.
3) Remove the secondary belt drive roller.
4) Remove the roller CL brush.
g. Secondary belt tension roller
1) Remove the secondary transfer belt.
2) Release the pawl, and remove the secondary belt tension
roller.
1
2
1
2
2
1
1