Konica 7075 GUIDE MANUAL 7075030e

3

DISASSEMBLY/ASSEMBLY

3 DIS./ASSEMBLY
3 DIS./ASSEMBLY
This section explains how to disassemble and reassemble the machine. When disassembling and reassembling the machine, follow the precautions given below.
1. Be sure the power cord has been unplugged from the wall outlet.
2. The disassembled parts must be reassembled following the disassembly procedure in reverse unless otherwise specified.
3. Care should be taken not to lose small parts. Care should also be taken not to install small parts in wrong places.
4. Do not operate the machine before installing all the disassembled parts completely .
5. Removal of some screws is prohibited in this section. Never loosen them.

EXTERNAL SECTION

EXTERNAL SECTION
[1] Replacing Ozone Filters
Caution: Be sure the power cord has
been unplugged from the wall outlet.
Caution: When replacing ozone filters, insert
them in the openings in the main body as far as they will go.
a. Procedure
(1) Loosen the two screws to remove the cooling fan
cover.
(2) Replace two ozone filters 1 (upper/2) and one
ozone filter 2 (lower/1).
Ozone filter 1
Screws (loosen 2)
[2] Removing and Reinstalling the
External Cover
Caution: Be sure the power cord has
been unplugged from the wall outlet.
a. Procedure
(1) Remove the two screws to detach the option
cover.
(2) Remove the nine screws to detach the rear cover.
Rear cover 1
Screws (9)
3 DIS./ASSEMBLY
Ozone filter 2
(3) Reinstall the above parts following the removal
steps in reverse.
Cooling cover
Option cover 1
(3) Remove the six screws to detach the left side
cover.
Screws (6)
Left side cover
Screws (2)
3 - A - 1
EXTERNAL SECTION
(4) Remove the four screws to detach the right side
cover (upper).
Right side cover (upper)
Screws (4)
(5) Open the vertical paper transport jam access
door.
(6) Remove the four screws to detach the right side
3 DIS./ASSEMBLY
cover (lower).
[3] Removing and Reinstalling the Front
Right Door
Caution: Be sure the power cord has
been unplugged from the wall outlet.
a. Procedure
(1) Open the front right door. (2) Remove the screw to disconnect the ground
cable.
Ground cable
Right side cover (lower)
Screws (4)
Vertical paper transport access door
(7) Reinstall the above parts following the removal
steps in reverse. Caution: Covers can be detached separately.
Screw
(3) Loosen the two screws securing the hinge. (4) While holding the top of the front right door by
hand so that it does not fall down, remove the door with the hinge pin held up.
Front right door
Screws (loosen)
3 - A - 2
(5) Reinstall the above parts following the re-
moval steps in reverse.
EXTERNAL SECTION
[4] Removing and Reinstalling the Front
Left Door
Caution: Be sure the power cord has
been unplugged from the wall outlet.
a. Procedure
(1) Open the front left door. (2) Remove the screw to disconnect the ground
cable.
Ground cable
[5] Removing and Reinstalling the
Operation Panel
Caution: Be sure the power cord has
been unplugged from the wall outlet.
a. Procedure
(1) Open the RADF. (2) Remove the two shoulder screws to remove
the original stopper plate (right).
(3) Remove the three shoulder screws to remove
the original stopper plate (rear).
(4) Remove the two shoulder screws to remove
the original stopper plate (left).
(5) Remove the platen glass.
Shoulder screws (2)
Shoulder screws (3)
Original stopper plate (rear)
Shoulder screws (2)
3 DIS./ASSEMBLY
Screw
(3) Loosen the two screws securing the hinge.
Caution: When loosening the screws, hold the
top of the door by hand so that it does not fall down.
(4) Remove the door with the hinge pin held up.
Front left door
Screws (loosen)
Original stopper plate (left)
Platen glass
Original stopper plate (right)
(5) Reinstall the above parts following the removal
steps in reverse.
3 - A - 3
EXTERNAL SECTION
(6) Remove the six screws to detach the top
cover (middle).
(7) Open the front right door and the front left door.
Screws (6)
Top cover (middle)
(8) Draw out the toner supply unit. (See “TONER
3 DIS./ASSEMBLY
SUPPLY UNIT.”)
(9) Remove the seven screws (three at the top and
four on the bottom).
(10)Draw out the operation panel forward.
Caution: When removing the operation panel,
pay attention to the following points:
The operation panel and main body are connected with a wiring harness. Moving the operation panel too far away from the main body could break the wiring harness.
• Care should be taken not to damage the display section.
(11) Disconnect the two relay connectors (CN475,
CN157) and remove the operation panel.
Connector (CN475)
Connector (CN157)
Screws (3 at the top)
Screws (4 on the buttom)
(12)Reinstall the above parts following the removal
steps in reverse.
3 - A - 4

DRIVE SECTION

DRIVE SECTION
[1] Removing and Reinstalling the
Drum Motor
Caution: Be sure the power cord has
been unplugged from the wall outlet.
Caution: Be sure to draw the drum unit out of
the main body before removing or reinstalling the drum drive motor. If you fail to draw out the drum unit, the cleaning blade may be damaged because the drum rotates when installing or removing the flywheel or gear.
a. Procedure
(1) Draw the drum unit out of the main body. (See
“DRUM UNIT.”)
(2) Remove the rear cover. (See “EXTERNAL SEC-
TION.”)
(3) Remove the three screws to remove the three
flywheels.
(4) Loose the two setscrews to remove the gear
holder, gear, and pin from the shaft. Caution 1: Install the gear with the shaft pin fit
into the groove at the back of the gear. As the pin inserted in the shaft moves freely, take care not to drop or lose it.
Caution 2: Secure the gear holder with the
setscrews while pressing the gear holder against the gear.
Gear
Gear holder
Pin
Pin
3 DIS./ASSEMBLY
Flywheels (3)
Setscrews (loosen 2)
Groove (at the back of gear)
(5) Disconnect the connector (CN58) and remove
the four screws to detach the drum motor unit.
Connector (CN58)
Drum motor unit
Screws (3)
3 - B - 1
Screws (4)
DRIVE SECTION
(6) Disconnect the connector (CN180) and remove
the four screws and two locking supports to remove the drum motor from the drum motor unit.
Screw (4)
Drum motor (M2)
Connector (CN180)
Locking supports
(7) Reinstall the above parts following the removal
3 DIS./ASSEMBLY
steps in reverse. Caution: When installing the gear holder, set it
to fit to the gear, then secure it b y the set screw .
[2] Removing and Reinstalling the Main
Motor
Caution: Be sure the power cord has
been unplugged from the wall outlet.
(1) Remove the rear cover. (See “EXTERNAL SEC-
TION.”) (2) Disconnect the connector (CN181). (3) Remove the four screws to release the motor
board locking supports. (4) Remove the main motor from the main body.
Main motor
Locking supports
Screws
Connector (CN181)
3 - B - 2

READ SECTION

READ SECTION
[1] Screw that Must not be Removed/
Loosened
a. 14 screws securing the CCD unit
Screws that
Screws that must not be removed
Screws that must not be removed
Screws that must not be removed
b. One screw securing the read position
adjusting plate and two screws securing the glass stopper plate (right)
must not be removed
[2] Removing and Reinstalling the CCD
Unit
Caution: Be sure the power cord has
been unplugged from the wall outlet.
Caution: Be sure to perform image adjustment
after installing the CCD unit. (See “ADJUSTMENT.”)
a. Procedure
(1) Remove the original stopper plates (right, rear,
and left), platen glass, and top cover (middle). (See “EXTERNAL SECTION.”)
(2) Remove the two screws to detach the white color
reference plate assembly.
Screws (2)
3 DIS./ASSEMBLY
Read position adjusting plate
Screws that must not be removed
White color reference plate assembly
(3) Remove the two screws to detach the lens light
blocking cover 2.
Screws (2)
Glass stopper plate (right)
Lens light blocking cover
3 - C - 1
READ SECTION
(4) Remove the eight screws to detach the lens light
blocking cover 1.
Screws (8)
Lens light blocking cover 1
(5) Remove the left side cover. (See “EXTERNAL
SECTION.”)
(6) Remove the seven screws to detach the fan
3 DIS./ASSEMBLY
mounting plate.
(7) Disconnect the connector (CN110) from the im-
age control board.
Image control board
Connector (CN110)
(8) Disconnect the connector (CN197) from the CCD
unit.
Screws (7)
Connector (CN197)
Fan mounting bracket
3 - C - 2
READ SECTION
(9) Remove the two screws to detach the CCD unit.
Screws (2)
CCD unit
(10)Reinstall the above parts following the removal
steps in reverse.
[3] Replacing the Exposure Lamp
Caution 1. Be sure the power cord has
been unplugged from the wall outlet.
Caution 2. Do not touch the exposure
lamp with bare hands.
Caution: Be sure to perform image adjustment
after installing the exposure lamp. (See “ADJUSTMENT.”)
a. Procedure
(1) Remove the original stopper plates (right, rear,
and left), platen glass, and top cover (middle). (See “EXTERNAL SECTION.”)
(2) Move the exposure unit to the notch in the main
body frame on the paper exit side.
(3) Remove the connector and two screws to detach
the exposure unit.
Screws (2)
Exposure lamp
Connector
3 DIS./ASSEMBLY
3 - C - 3
(4) Reinstall the above parts following the removal
steps in reverse.
READ SECTION
[4] Replacing and Reinstalling the
Exposure Unit
Caution: Be sure the power cord has
been unplugged from the wall outlet.
Caution 1: When installing the exposure unit,
use the optical unit positioning jig.
Caution 2: Be sure to perform image adjust-
ment after installing the exposure lamp. (See “ADJUSTMENT.”)
a. Removal procedure
(1) Remove the original stopper plates (right, rear,
and left), platen glass, and top cover (middle). (See “EXTERNAL SECTION.”)
(2) Remove the operation panel. (See “EXTERNAL
SECTION.”)
(3) Move the exposure unit to the notch in the main
body frame on the paper exit side.
(4) Remove the two screws to detach the cord clamp
(B).
(5) Remove the screw to remove the ground termi-
3 DIS./ASSEMBLY
nal. (6) Disconnect the connector (CN632). (7) Remove the four screws to detach the exposure
unit.
Exposure unit fixing screw
b. Installation procedure
(1) Insert the optics unit positioning jig in the hole at
the exposure unit mounting position from the front.
(2) Slide the exposure unit to the paper feed side
until it touches the optical unit positioning jig.
Exposure unit
Optics unit positioning jigs
(3) Secure the four screws to attach the exposure
unit to the optics wire mounting bracket. (4) Remove the optics unit positioning jig. (5) After the procedure (4), reinstall the parts re-
moved in "a. Removal procedure" following the
removal steps in reverse.
Screws (2)
Screws (2)
Connector (CN632)
Screw (ground) Exposure unit fixing screw
Cord clamp/B
Screws
3 - C - 4
READ SECTION
[5] Installing the Optics Wire
Caution: Be sure the power cord has been
unplugged from the wall outlet.
Caution 1: When winding the optics wire
around the pulley, be sure to run the wire tightly so that it does not ride on the side of the pulley.
Caution 2: When re-tensioning or replacing
the optics wire, be sure to use the optics positioning jig.
Caution 3: Be sure to perform image adjus-
tment after replacing or re-insta­lling the wire. (See “ADJUSTM­ENT.”)
a. Procedure
(1) Remove the exposure unit. (2) Remove the two screws to detach the white color
reference plate.
Screws
(4) Insert the optics positioning jigs in the holes at the
exposure unit mounting position from the front.
Exposure unit
V-mirror unit
Optics positioning jigs
Exposure unit fixing hole
V-mirror fixing hole
3 DIS./ASSEMBLY
White color reference plate
(3) Move the V-mirror unit toward the paper feed
side, then insert the optics positioning jigs from the front to secure the V-mirror unit. Ensure that the optics positioning jigs pass through the V­mirror unit.
Optics positioning jig insertion holes
3 - C - 5
READ SECTION
(5) The exposure unit mounting plate is installed on
each optics wire. The position of mounting plate differs depending on whether it is installed on the front or rear wire. Use the wire on which the mounting plate is installed nearer to the metal bead at the end, at the rear.
(6) Place the metal bead at the midpoint of each
optics wire in the mounting hole in the drive pulley. Starting at this point, wind the optics wire five turns to the outside and four times to the inside on the drive pulley.
Caution 1: Ensure that there is a metal bead
at the end of the outer wire, and a wire terminal at the end of the inner wire.
Caution 2: Pull out the outer wire from above
the drive pulley in the paper exit direction, and the inner wire from under the drive pulley in the paper feed direction.
(7) After winding the outer wire, secure it to the wire
3 DIS./ASSEMBLY
stopper via the outside of pulley 1 and V-mirror pulley.
3 - C - 6
READ SECTION
Five turns
Front
Metal bead
Optics wire (front)
11
Four
Drive pulley
Wire stopper
Metal bead
Wire stopper
10
Pulley 1
Four
10
Wire stopper
Metal bead
Metal bead
Five turns
Rear
Metal bead
Exposure unit mounting piece
Optics wire (rear)
V-mirror unit
Wire stopper
V-mirror unit
Metal bead
Spring
Screws
Spring fixing plate
Exposure unit mounting piece
Metal bead
Rear
Pulley 3
Spring fixing plate
13
12
Lug terminal
11
Pulley 1
Pulley 2
3 DIS./ASSEMBLY
9
Pulley 1
V-mirror unit
Caution: There are two grooves in the wire
stopper. Ensure that the outer groo ve is at the rear and the inner groove is at the front.
(8) Pass the inner wire through the notch in the wire
stopper, reverse it at pulley 2, pass it along the inside of the V-mirror pulley and pulley 3, then attach the wire terminal to the spring fixing plate. At this time, secure the spring fixing plate tempo­rarily with one screw.
Metal bead
Optics wire (rear)
Optics wire (front)
(9) Install the other wire following the same proce-
dure.
(10)Loosen each screw that was tightened tempo-
rarily, install the spring on the spring fixing plate, and tighten each screw.
3 - C - 7
READ SECTION
[6] Cleaning the Slit Glass and White
Color Reference Plate Glass
Caution: Be sure the power cord has
been unplugged from the wall outlet.
(1) Open the RADF. (2) Remove the original stopper plates (right, rear,
and left) and platen glass. (See “EXTERNAL SECTION.”)
(3) Remove the two screws to detach the white color
reference plate subassembly.
(4) Clean the slit glass portions of the removed white
color reference plate subassembly and the glass surface of the white color reference plate, using drum cleaner and cleaning pad.
White color reference plate subassembly
3 DIS./ASSEMBLY
Slit glass
[7] Cleaning the Platen Glass
Caution: Be sure the power cord has been
unplugged from the wall outlet.
(1) Open the RADF. (2) Remove the original stopper plates (right, rear,
and left) and platen glass. (See “EXTERNAL
SECTION.”) (3) Place the removed platen glass on the towel or
rags and clean it using drum cleaner and cleaning
pad.
Shoulder screws (2)
Original stopper plate (rear)
Shoulder screws (3)
Shoulder screws (2)
White color reference plate glass
(5) Reinstall the above parts following the removal
steps in reverse.
Platen glass
Original stopper plate (left)
Original stopper plate (right)
(4) Reinstall the above parts following the removal
steps in reverse.
3 - C - 8

WRITE SECTION

WRITE UNIT
[1] Removing and Reinstalling the Write
Unit
Warning:
(1) Do not energize the write unit when it is
not in the correct position.
(2) Never remove the write unit cover and the
polygon unit cover. If the laser beam gets into your eyes, y ou may lose your sight.
(3) Never remove the write unit for at least
two minutes after turning OFF the main switch.
Caution: Be sure the power cord has
been unplugged from the wall outlet.
a. Procedure
(1) Remove the original stopper plates (right/rear/
left) and platen glass. (See “EXTERNAL SEC­TION.”)
(2) Remove the six screws to detach the board
protection cover.
Screws (6)
(3) Disconnect the four connectors (CN190, 191,
192, and 193) from the write unit.
CN190
CN191
Write unit
(4) Remove the right side cover (upper) (by remov-
ing the four screws).
(5) Disconnect the three connectors (CN76, 474 and
583).
(6) Remove the four screws to detach the write unit
cover.
CN193
CN192
3 DIS./ASSEMBLY
Board protection cover
Screws (4)
Connector (CN76, CN583)
Write unit cover
Connector (CN474)
3 - D - 1
WRITE UNIT
(7) Loosen the two screws to draw out and remove
the write unit.
Screw (loosen)
Screw (loosen)
Write unit
(8) Reinstall the above parts following the removal
steps in reverse.
3 DIS./ASSEMBLY
[2] Cleaning the Dust-proof Glass
Caution: Be sure the power cord has
been unplugged from the wall outlet.
a. Procedure
(1) Draw out the drm unit. (See “Drum Unit.”) (2) Remove the dust-proof glass assembly by draw-
ing it out forward. (3) Using a cleaning pad and blower brush, clean the
dust-proof glass portions.
Dust-proof glass
Drum unit
(4) Reinstall the above parts following the removal
steps in reverse.
3 - D - 2
[3] Removing and Reinstalling the
Image Control Board
Caution: Be sure the power cord has
been unplugged from the wall outlet.
a. Procedure
(1) Remove the left side cover. (See “EXTERNAL
SECTION.”)
(2) Remove the seven screws to detach the fan
mounting plate.
Fan mounting plate
WRITE UNIT
(5) Reinstall the above parts following the removal
steps in reverse.
Caution 1: Insert the board along the guides
in the main body.
Caution 2: Be sure the connector of the board
is inserted securely.
Image control board
Screw (7)
(3) Remove the CCD flat cable connector (CN110)
and ethernet cable connector (CN111).
(4) Remove the two screws and the image control
board.
Connector (CN 110)
Connector (CN111)
Guide
3 DIS./ASSEMBLY
Screws (2)
Image control board
3 - D - 3

DRUM UNIT

DRUM UNIT
[1] Removing and Reinstalling the
Drum Unit
Caution: Be sure the power cord has
been unplugged from the wall outlet.
Caution 1: Be sure to put a drum cover over
the removed drum unit and store the drum unit in a dark place.
Caution 2: When installing or removing the
drum unit, do not rotate it in the direction opposite to the specified one. Rotating the drum unit in the opposite direction during copy operation could damage the cleaning blade.
Caution 3: When installing or removing the
drum unit, take care not to touch the separation claw.
a. Procedure
(1) Open the front right door to draw out the toner
supply unit completely. (See “TONER SUPPLY UNIT”)
(2) Remove the three screws to detach the drum
cover.
(3) With the solenoid release lever under the ADU
frame held down to the left, turn down the ADU
frame drawing lever. (4) Remove the two screws securing the drum unit. (5) Remove the screw securing the coupling to de-
tach the coupling. (6) Supporting the drum unit by hand at the two
positions shown below, draw out the drum unit.
Caution: When drawing out the drum unit, do
not grip the pipe in the toner recycle section.
Hold here.
3 DIS./ASSEMBLY
Handle
Coupling
Screw
Drum cover
Screws (2)
Handle release lever
(7) Reinstall the above parts following the removal
steps in reverse.
Caution: For how to install the coupling, see “[2]
Installing the Coupling.”
Screw (3)
3 - E - 1
DRUM UNIT
[2] Cleaning and Installing the Coupling
Caution: Be sure the power cor d has been
unplugged from the wall outlet.
a. Procedure
(1) Clean the outer surface of the coupling with drum
cleaner.
(2) Aligning the line marked on the coupling with the
key way in the drum shaft, push in the coupling by hand.
Marked­off line
Key way
3 DIS./ASSEMBLY
[3] Removing and Reinstalling the
Drum Temperature Sensor Board
Caution: Be sure the power cord has
been unplugged from the wall outlet.
a. Procedure
(1) Draw the drum unit out of the main body. (2) Disconnect the three connectors (350, 351, and
353) and remove two screws to detach the sen­sor support stay assembly.
Connector (CN350)
Connector (CN353) Connector (CN353)
Sensor support stay assembly
Screws (2)
Cord tie
(3) While pressing the standard screwdriver tip
against the coupling, turn the coupling clockwise until the cut face of the coupling is flush with the bearing face.
Cut face
Bearing face
Driver
(4) Tighten the screws.
Connector (CN351)
3 - E - 2
DRUM UNIT
(3) Disconnect the connector (CN455) and remove
three screws to detach the drum temperature sensor.
Connector (CN455)
Drum temperature sensor
Screws (three)
(4) Reinstall the above parts following the removal
steps in reverse. Caution: After reinstalling the drum temperature
sensor board, visually check that the drum temperature sensor is in good contact with the drum.
[4] Cleaning the Toner Control Sensor
Board
Caution: Be sure the power cord has
been unplugged from the wall outlet.
a. Procedure
(1) Draw the drum unit out of the main body. (2) Remove the drum cleaning unit. (See “CLEAN-
ING/TONER RECYCLE UNIT.”) (3) Remove the screw at the back of the sensor
guide and loosen the screw at the front to move
the sensor guide.
Screw
3 DIS./ASSEMBLY
Sensor guide
Screw (loosen)
(4) Clean the sensors on the toner control sensor
board (the Dmax/jam detection sensor at the
front and the γ sensor at the back) using a blower
brush.
γ sensor
Dmax/jam detection sensor
3 - E - 3
DRUM UNIT
[5] Removing, Cleaning and
Reinstalling the Drum
Caution: Be sure the power cord has
been unplugged from the wall outlet.
Caution1: Be careful not to touch the drum
or the cleaning blade with bare hands, or damage these parts.
Caution2: When leaving the drum to stand,
be sure to put a drum cover over the drum and store it in a dark place.
Caution3: When reinstalling the drum,
cleaning blade and toner guide brush, apply setting powder to the entire surface of the drum and also to the cleaning blade regardless of whether the parts are new or old.
Caution4: After applying setting powder to the
drum, carry out the following work before installing the drum unit in
3 DIS./ASSEMBLY
a. Procedure
(1) Draw the drum unit out of the main body. (2) Remove the charging corona unit, developing
unit, developing suction assembly drum tem­perature sensor board, and cleaning unit. (See “CORONA UNIT SECTION,” “DEVELOPING UNIT,” and “CLEANING/TONER RECYCLE UNIT.”)
the main body.
1) With the charging corona unit and developing unit removed, turn the drum once (to prevent setting powder from scattering onto the charging corona unit, and to prevent image defects).
2) When installing a new drum, be sure to enter the 25 mode and select “Copy Count by Parts to be Replaced” to reset drum counter. (See “ADJUSTMENT. ”)
(3) Remove the screw at the back of the sensor
guide and loosen the screw at the front to move the sensor guide (to prevent the drum from being damaged during reinstallation).
Screw
Sensor guide
Screw (loosen)
(4) Supporting the drum at both ends with your
fingers so that the drum surface is not damaged, slowly remove it upward (front side first).
(5) Clean the hole (that engages with the bearing on
the rear end of the drum shaft) on the rear side of the drum cartridge with drum cleaner.
(6) Clean toner scattered around the drum installation
area using a blower brush.
Engaging hole
Drum
3 - E - 4
Need to clean toner
(7) Reinstall the above parts following the removal
steps in reverse.
DRUM UNIT
[6] Removing and Reinstalling the
Separation Claws
Caution: Be sure the power cord has
been unplugged from the wall outlet.
Caution 1: T ake care not to damage the drum
when removing the separation claws.
Caution 2: Pa y attention to the orientation and
position of the separation claws when reinstalling them.
Caution 3: Do not touch the cleaning blade
and drum with bare hands.
a. Procedure
(1) Draw the drum unit out of the main body. (2) Remove the cleaning/toner recycle unit. (See
“CLEANING/TONER RECYCLE UNIT.”)
(3) To protect the drum surface, set A3 paper as
shown below. Caution: After installing the separation claw,
remove the A3 paper by pulling it do wn as shown below.
(4) Disconnect the connector (CN354), and remove
the spring and two screws to detach the separa­tion claw unit.
(5) Remove the retaining ring and slide the shaft to
remove the three separation claws. Caution 1: Clean the separation claw drive
shaft with alcohol when installing it.
Caution 2: Must insert the retaining ring
between the ribs.
Caution 3: After reinstalling the separation
claws, make sure they move smoothly.
Separation claws
Retaining ring
3 DIS./ASSEMBLY
Screws
Spring
Connector (CN354)
A3 paper
Ribs
3 - E - 5
DRUM UNIT
(6) Reinstall the above parts following the removal
steps in reverse. Caution: When installing the separation claw
unit, be sure to fit the pin in the guide hole as shown below.
Pin
Guide hole
Drum unit
3 DIS./ASSEMBLY
Separation claw unit
[Reference] When you removed the separation claw unit (you need not remove it usually but you need to remove it only when replacing the solenoid), install it in the following manner:
(1) Install the separation claw unit in the drum car-
tridge.
(2) Tighten the solenoid screw when one of the
separation claws, which is closest to the drum, contacts the drum. (Hex. nut, M3)
Separation claw solenoid (SD4)
Screws (2)
(Hex. nut)
Drum
Separation claw unit
(3) Set the drum cartridge in the main body and
check the tips of the separation claws are off the drum surface.
Standard value of clearance: More than 0 mm up to 1 mm inclusive
3 - E - 6

CORONA UNIT SECTION

CORONA UNIT SECTION
[1] Screws that Must not be Removed/
Loosened
a. Five screws securing the transfer entrance
guide plate
Screws that must not be removed
Transfer entrance guide plate
Caution 1: Do not strain the transf er entrance
guide plate and guide rollers, for example, pressing down on them strongly, when removing the charging corona unit.
Caution 2: T ak e care not to damage the edge
of the transfer entrance guide plate since it is deformed easily.
[2] Removing and Reinstalling the
Charging Corona Unit
Caution: Be sure the power cord has
been unplugged from the wall outlet.
Caution: When removing the charging
corona unit, do not touch the mesh of the charge control plate.
a. Procedure
(1) Remove the drum unit from the main unit. (See
“DRUM UNIT.”)
(2) Disconnect the connector (CN353). Holding the
charging corona unit at the positions shown be­low with both hands, remove it.
Connector (CN353)
Charging corona unit
3 DIS./ASSEMBLY
3 - F - 1
(3) Reinstall the above parts following the removal
steps in reverse.
CORONA UNIT SECTION
[3] Removing and Reinstalling the
Charge Control Plate
Caution: Be sure the power cord has
been unplugged from the wall outlet.
a. Procedure
(1) Remove the charging corona unit. (2) Press the lever in the direction of the arrow to
release the lock, then remove the charge control plate. Caution: Do not loosen or tighten the screws
securing the lever.
Charge control plate
3 DIS./ASSEMBLY
(4) Remove the springs of wires (one each) to re-
move the wires. Caution 1: Do not drop or lose the support
rubbers when removing wires.
Caution 2: Reinstall wires so that their hooks
are inside.
Spark arrester plate
Lever
(3) Reinstall the above parts following the removal
steps in reverse.
[4] Replacing the Charging Wires
Caution: Be sure the power cord has
been unplugged from the wall outlet.
a. Procedure
(1) Remove the charging corona unit. (2) Remove the charge control plate. (3) Remove the spark arrester plates (front and
rear).
Support rubber
Wire
Spring
Hook (inward)
3 - F - 2
(5) Reinstall the above parts following the removal
steps in reverse.
CORONA UNIT SECTION
1
2
3
[5] Removing and Reinstalling the
Charging Wire Cleaning Pad
Caution: Be sure the power cord has
been unplugged from the wall outlet.
a. Procedure
(1) Remove the two charging wires. (2) Remove the two retaining rings to remove the
charging wire cleaning pads. Caution 1: Take care not to drop or lose the
lower collars when removing the charging wire cleaning pads.
Caution 2: When reinstalling the charging wire
cleaning pads, pay attention to the orientation shown below. Do not forget to attach the collars.
Charging wire cleaning pad
[6] Removing and Reinstalling the PCL
Caution: Be sure the power cord has
been unplugged from the wall outlet.
a. Procedure
(1) Remove the charging corona unit. (2) Disconnect the connector (CN356) of the PCL
and release the lock to remove the PCL.
Connector (CN356)
3 DIS./ASSEMBLY
Collar
Retaining ring
Charging wire cleaning pad
(3) Reinstall the above parts following the removal
steps in reverse.
(3) Reinstall the above parts following the removal
steps in reverse.
3 - F - 3
CORONA UNIT SECTION
[7] Cleaning the Charging Corona Unit/
PCL
Caution: Be sure the power cord has
been unplugged from the wall outlet.
a. Procedure
(1) Remove the charging corona unit. (2) Remove the charge control plate and PCL. (3) Place the charge control plate on a flat place and
clean its surface with light taps of the cleaning pad moistened with drum cleaner. Next, remove any remaining dirt with a blower brush. Caution: Take care not to damage the mesh of
the charge control plate during cleaning.
(4) Clean the PCL with a cleaning pad moistened
with drum cleaner.
3 DIS./ASSEMBLY
Charge control plate
[8] Removing and Reinstalling the
Transfer/Separation Corona Unit
Caution: Be sure the power cord has
been unplugged from the wall outlet.
a. Procedure
(1) Open the toner supply unit. (See “TONER SUP-
PLY UNIT.”) (2) Detach the ADU cover. (See “ADU UNIT.”) (3) Loosen the two screws to remove the transfer/
separation corona unit.
Transfer/separation corona unit
Screw
PCL
Screw
Lever
(4) Reinstall the above parts following the removal
steps in reverse.
Caution: When installing the transfer/
separation corona unit, make sure the cleaning gear coupling is engaged properly.
3 - F - 4
CORONA UNIT SECTION
[9] Removing and Reinstalling the
Plunger Prevention Plate
Caution: Be sure the power cord has
been unplugged from the wall outlet.
a. Procedure
(1) Open the toner supply unit. (See “TONER SUP-
PLY UNIT.”)
(2) Draw the ADU frame out of the main body. (See
“ADU UNIT.”) (3) Remove the transfer/separation corona unit. (4) Release the twelve locks to remove the plunger
prevention plate.
Plunging prevention plate
[10] Replacing the Transfer/Separation
Wires, Transfer/Separation Wire Cleaning Block and Support Rubbers
Caution: Be sure the power cord has
been unplugged from the wall outlet.
a. Procedure
(1) Open the toner supply unit. (See “TONER SUP-
PLY UNIT.”)
(2) Draw the ADU frame out of the main body. (See
“ADU UNIT.”) (3) Remove the transfer/separation corona unit. (4) Remove the plunger prevention plate. (5) Remove the spark arrester plates (front and
rear).
Spark arrester plate (rear)
Spark arrester plate (front)
3 DIS./ASSEMBLY
Locks (the same number of locks on the opposite side)
(5) Reinstall the above parts following the removal
steps in reverse.
(6) Remove the springs of wires (one each) to re-
move the wires.
Caution: When installing the springs, bend the
edge of each spring in side.
3 - F - 5
Loading...
+ 74 hidden pages