Konica 7075 GUIDE MANUAL 7075030e

DISASSEMBLY/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

[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

[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

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

[1] Screw that Must not be Removed/

Loosened

a. 14 screws securing the CCD unit

Screws that

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)

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)

Four

Drive pulley

Wire stopper

Metal bead

Wire stopper

Pulley 1

Four

Wire stopper

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

Lug terminal

Pulley 1

Pulley 2

3 DIS./ASSEMBLY

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)

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

[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.

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

[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

[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

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