Chapter 5 Disassembly
5-1. Cover ....................................................... 5-1
5-1-1. Platen cover ........................................ 5-1
5-1-2. Left cover.............................................5-1
5-1-3. Right cover ..........................................5-1
5-1-4. Upper rear cover .................................5-1
5-1-5. Lower rear cover ................................. 5-1
5-1-6. Front cover ..........................................5-1
5-2. Platen glass ............................................5-2
5-3. Operation panel......................................5-2
5-4. Paper feed unit .......................................5-2
5-4-1. Paper feed (segment) roller
1
(Main unit) ...........................................5-2
1
5-4-1'. Paper feed (segment) roller
(Optional cassette feeder) .............5-2-1
5-4-2. Slip roller ............................................. 5-3
5-5. Conveyance and transfer unit .............. 5-3
5-5-1. Transfer roller...................................... 5-3
5-5-2. Upper regist roller............................... 5-3
5-5-3. Lower regist roller .............................. 5-3
5-6. Fixing unit ............................................... 5-4
5-6-1. Fixing upper cover.............................. 5-4
5-6-2. Thermistor and thermostat ................5-4
5-6-3. Heater lamp ......................................... 5-4
5-6-4. Separation claws ................................ 5-4
5-6-5. Heat roller ............................................5-5
5-6-6. Pressure (rubber) roller...................... 5-5
5-7. Optical section ....................................... 5-5
5-7-1. Lens cover ........................................... 5-5
5-7-2. No. 6 mirror unit .................................. 5-5
5-7-3. Exposure lamp ....................................5-5
5-7-4. Temperature fuse ................................ 5-5
5-7-5. Scanner wire ....................................... 5-6
5-8. SDH unit .................................................. 5-6
5-8-1. S1sensor.............................................. 5-6
5-8-2. S2 sensor............................................. 5-6
5-8-3. Paper feed clutch, paper feed
roller ..................................................... 5-7
5-8-4. Separation roller ................................. 5-7
5-8-5. Gear frame ........................................... 5-7
5-8-6. Lower conveyance roller.................... 5-7
5-8-7. Lower turn roller ................................. 5-7
5-8-8. Upper turn roller ................................. 5-7
5-8-9. Paper exit roller................................... 5-7
5-8-10. Upper conveyance roller .................. 5-8
5-9. PCB ......................................................... 5-8
5-9-1. Operation PCB .................................... 5-8
5-9-2. Main PCB .............................................5-8
5-9-3. High voltage PCB................................ 5-9
5-9-4. Power PCB .......................................... 5-9
5-10. Replacement of the Ozone filter .......5-10
MODEL
1312
MANUAL
SERVICE HANDBOOK
REVISED EDITION
1
DATA
May.1999
PAGE
METHOD
REPLACEMENT
Chapter 5 Disassembly
Cautions for disassembly and assembly
work:
1) Always disconnect the power plug as protection
against electric shocks and to prevent damaging the
internal circuit.
2) If the work time with the upper unit opened becomes
long, pull out the drum unit and store it in a dark
place. (Prevention of the light fatigue and scratches.)
5-1. Cover
5-1-1. Platen cover
Pull off the platen cover.
5-1-2. Left cover
Remove the four screws, open the upper unit and
remove the left cover.
5-1-4. Upper rear cover
Remove the five screws (one of the five screws is
also used to fix the document scale). Then open the
upper unit and remove the upper rear cover.
Note: Do not loosen the other document scale fixing
screws as the center position is deviated by
loosing them.
5-1-5. Lower rear cover
Loosen the five screws, and remove the lower rear
cover.
5-1-3. Right cover
Remove the five screws (two of the five screws are
also used to fix the document scale). Then remove
the right cover.
Note: Do not loosen the other document scale fixing
screws as the center position is deviated by
loosing them.
5-1-6. Front cover
1) Pull out the cassette and remove the three
screws. Then open the upper unit and remove the
screw on the left side.
2) Unhook the three hooks on the back side of the
cover and remove the front cover.
5-1
Chapter 5 Disassembly
5-2. Platen glass
1) Remove the left cover. (Refer to section 5-1.)
2) Lift the edge of the glass slightly, and pull the glass
out in the direction of the arrow.
Note 1: If the edge of the glass is lifted too high, the
corners could be broken.
Note 2: The platen glass can also be removed by
removing the right cover and document scale.
However, as the center position will be
deviated, the glass could drop when the
upper unit is opened.
5-3. Operation panel
1) Remove the right cover, platen glass and left cover.
(Refer to sections 5-1 and 5-2.)
2) Open the upper unit, and remove the six screws.
Disconnect the flat cable connector inside and
remove the operation panel.
2) Loosen the fixing screws on the rear side of the
TC roller by two or three turns.
3) Remove the five fixing screws, disconnect the
three connectors, and remove the paper feed unit.
Note: Take care not to scratch the guide film when
installing or removing the paper feed unit.
Guide film
5-4. Paper feed unit
1) Open the upper unit, and remove the protection
cover (two screws) on the rear side.
Note: As the protection cover also acts as the regist
roller clutch stopper, make sure to align with the
clutch unit stopper position when assembling.
1
5-4-1. Paper feed (segment) roller (Main unit)
1) Remove the E-ring and the paper feed roller
assembly.
MODEL
1312
MANUAL
SERVICE HANDBOOK
REVISED EDITION
5-2
1
DATA
May.1999
PAGE
5-2
METHOD
REPLACEMENT
Chapter 5 Disassembly
2) Unhook and pull out the gears and paper feed
rollers rom the shaft.
Paper feed roller / F
Paper feed roller / R
Note1: Take care not to lose the bearing and the
spacer washer.
Note2: Take care not to mix the paper feed
roller/F up with the rear paper feed roller/R,
because they are different.
5-4-1'. Paper feed (segment) roller (Optional
cassette feeder)
1) Remove the main unit from the optional cassette
feeder.
2) Push down the hook, and pull the paper feed roller
to the front.
3) Remove the paper feed roller from the rear
bearing, and remove the roller from the front
holder.
Hook
A projection is on the one side of the paper feed roller
Paper feed roller / R Paper feed roller / F
4) Unhook and pull out the paper feed roller from the
shaft, as same procedure as the roller of the main
unit.
Note1: The paper feed rollers of the optional
cassette feeder are differed with the rollers of
the main unit.
Note2: The front and rear paper feed roller of the
optional cassette feeder are same.
There are projections on each
side of the paper feed roller.
MODEL
1312
MANUAL
SERVICE HANDBOOK
REVISED EDITION
5-3
1
DATA
May.1999
PAGE
5-2-1
METHOD
ADDITION
Chapter 5 Disassembly
This page left blank intentionally for editorial reasons.
MODEL
1312
MANUAL
SERVICE HANDBOOK
REVISED EDITION
5-4
1
DATA
May.1999
PAGE
5-2-2
METHOD
ADDITION
Chapter 5 Disassembly
5-4-2. Slip roller
1) Remove the JAM1 sensor lever.
Note: Take care not to lose the spring or resin washer.
2) Unhook the grounding spring catch and the hook,
then remove the slip roller.
Grounding spring
5-5-1. Transfer roller
Unhook the bearing catch on the front and remove
the transfer roller.
Note: Take care not to lose the springs under the
bearings.
5-5-2. Upper regist roller
Remove the springs and E-rings on both sides, then
remove the upper regist roller.
5-5. Conveyance and transfer unit
1) Remove the paper feed unit. (Refer to section 5-4.)
2) Remove the one screw fixing the electrode spring
under the insulation film, then remove the other
three screws to remove the conveyance and
transfer unit.
5-5-3. Lower regist roller
1) Remove the special washer (resin washer) on the
rear side, and remove the regist roller clutch and
gear assembly.
Note: Always confirm how the springs in the gear
assembly are set before disassembling.
2) Remove the gears and E-rings on the front, then
remove the lower regist roller.
Gear assembly
5-3
Chapter 5 Disassembly
5-6. Fixing unit
1) Open the upper unit and remove the protection
cover (two screws) on the rear side.
Note: As the protection cover also acts as the regist
roller clutch stopper, make sure to align with
the clutch unit stopper position when assembling.
2) Remove the two fixing screws, pull out the three
connectors, and remove the fusing unit.
5-6-2. Thermistor and thermostat
1) Thermistor
Remove one screw, then remove the thermistor.
2) Thermostat
Remove the two screws to undo the thermostat
from the holder, then pull out the terminal and
remove the thermostat.
Note: As this thermostat is not a self-recovering type,
replace the part when it worked.
Thermostat
Thermistor
5-6-3. Heater lamp
1) After undoing the thermostat from the holder, pull
out the thermostat terminal and cut the binder to
undo the lamp lead wire from each harness clamp.
2) Remove the lamp fixing holder (two screws) and
remove the heater lamp.
Note: As the paper exit side is caught on the rib and
fixed, make sure to securely insert when
assembling.
5-6-1. Fixing upper cover
Pull out the cleaning pad and remove the four screws.
Then remove the fixing upper cover.
Binder
Heater lamp
5-6-4. Separation claws
Remove the grounding brush (two screws), and the
springs to remove the separation claws.
Note: Install the separation claws after the heat roller
when installing.
5-4
Grounding brush
Chapter 5 Disassembly
5-6-5. Heat roller
1) Remove the pressure springs.
2) Remove the C-ring, and pull out the heat roller.
Note: Always remove the separation claws and
thermistor first to prevent the roller surface from
being scratched.
C-ring
Heat roller
Pressure springs
5-6-6. Pressure (rubber) roller
After pulling out the heat roller, pull out the pressure
(rubber) roller.
5-7-2. No. 6 mirror unit
Remove the four screws, and remove the No.6 mirror
unit.
5-7-3. Exposure lamp
1) Remove the operation panel. (Refer to section 5-3.)
2) Move the No. 1 scanner to the square hole position
of the frame on the front, and then pull out the
exposure lamp.
Pressure (rubber) roller
5-7. Optical section
Remove the platen cover, left cover, right cover and
platen glass. (Refer to sections 5-1 and 5-2.)
5-7-1. Lens cover
Remove the two screws, and remove the lens cover.
Note: When installing the exposure lamp, make sure
that the lamp protrusion faces the opposite side
of the reflector and manufacturer's mark is on
the rear side of the main unit.
Protrusion
Reflector
5-7-4. Temperature fuse
(Front side fuse)
Remove the fuse cover (one screw), and remove the
temperature fuse (two screws)
5-5
Chapter 5 Disassembly
(Rear side fuse)
1) Remove the upper rear cover. (Refer to section 5-1.)
2) Remove the glass mounting plate (three screws)
and fuse cover (one screw). Then remove the
temperature fuse (two screws).
Glass mounting plate
5-7-5. Scanner wire
Remove the No. 1 scanner fixing screw and spring.
Then, remove the scanner wire
5-8. SDH unit
1) Disconnect the connector, and remove the SDH
unit from the main unit.
2) Reverse the SDH unit, and remove the two screw
fixing the platen sheet.
3) Remove the eight fixing screws, and remove the
SDH unit from the cover.
5-8-1. S1 sensor
1) Remove the fixing screw, disconnect the connector,
and remove the S1 sensor.
Platen sheet
S1 sensor
Scanner wire
Spring
(No. of turns for the drive pulley wire)
Note 1: The scanner must be at the position shown
above.
Note 2: After turning the wire, temporarily fix the
drive pulley with tape, etc., so that the wire
will not come undone until the installation is
completed.
Front side(transparent) Rear side (black)
4 times 3 times 3 times 4 times
5-8-2. S2 sensor
1) Open the top cover.
2) Remove the paper guide (four screws).
3) Disconnect the connector, unhook, and remove the
S2 sensor.
5-6
S2 sensor
Chapter 5 Disassembly
5-8-3. Paper feed clutch, paper feed roller
1) Remove the two pressure springs.
2)
Remove the C-ring, and then remove the paper feed
clutch.
3) Remove the C-ring (one ring) and E-rings (two
rings), and then pull out the roller shaft.
4) Remove the paper feed roller.
C-ring
E-rings
5-8-4. Separation roller
1) Unhook the separation roller and remove it.
Note: Take care not to lose the pressure springs.
Separation roller
5-8-6. Lower conveyance roller
1) Shift the roller in the direction of the arrow and
remove it.
Note: Take care not to lose the metal.
5-8-7. Lower turn roller
1) Remove the O-ring and C-ring, and pull out the
roller.
C-ring
O-ring
5-8-5. Gear frame
1) Remove the arm from the paper feed solenoid.
2) Remove the four fixing screws, and remove the
gear frame.
Arm
5-8-8. Upper turn roller
1) Remove the two screws, and remove the roller
frame.
2) Remove the plate spring (one screw), and remove
the roller.
5-8-9. Paper exit roller
1) Remove the O-ring and C-ring, shift the roller in
the direction of the arrow, and remove it.
C-ring
5-7
O-ring
Chapter 5 Disassembly
5-8-10.Upper conveyance roller
1) Remove the guide plate (three screws).
Guide plate
2) Remove the plate spring (one screw), and remove
the roller.
5-9-2. Main PCB
1)
Remove the lower rear cover. (Refer to section 5-1.)
2) Disconnect each connector, and remove the main
PCB (four screws).
Note 1: Insert the FPC lead wire in straight, and take
care not to damage the connection section.
Note 2: When replacing the main PCB, re-input all of
the adjustment data in 25 mode and 36 mode.
The developing unit must also be reinitialized.
Note 3: When reinitializing the developing unit, the
developer’s density must be at an optimum
value. If it is not, F26 (initialize error) will occur.
Thus, initialize the unit after adjusting the toner
density. When initializing it, developing count
value(mode C-42) is cleared. For that reason,
re-input the count value by using the 25 mode
(85~90).
5-9. PCB
5-9-1. Operation PCB
1) Remove the operation panel. (Refer to section 5-
3.)
2) Reverse the operation panel, and remove the
lower cover (three screws).
3) Remove the seven fixing screws, and remove the
operation PCB.
Note: Take care not to lose the key buttons.
Reference:Comfirm the toner density of the solid black
part using a test chart. In case it is not proper,
the developing unit must be reinitialized after
adjusting item shown below.
* When toner density is high:
Copy with the service mode 36-02, to consume the
toner.
* When toner density is low:
Forcibly supply the toner with the service mode 47-
01.
* Refer to Chapter 8 for details on the service modes.
Operation PCB
5-8
Chapter 5 Disassembly
5-9-3. High voltage PCB
1)
Remove the upper rear cover. (Refer to section 5-1.)
2) Remove the protection plate (two screws).
3) Disconnect each connector, and remove the high
voltage PCB (four screws).
High voltage PCB
5-9-4. Power PCB
1) Open the upper unit, and remove the protection
cover (two screws) on the rear side.
Note: The protection cover also acts as the regist
roller clutch stopper, so when assembling,
make sure to align with the clutch unit stopper
position.
5) Disconnect the lamp lead wire from the binder
inside the plate, and pull the plate to the outer side
of the main unit.
6) Disconnect the connector on the power PCB, and
the two connectors on the aluminium plate, and
then remove the aluminium plate (one screw).
Aluminium plate
6) Disconnect each connector, and remove the
power PCB (three screws).
2)
Remove the lower rear cover. (Refer to section 5-1.)
3) Remove the two grounding screws, and disconnect
the interlock switch connector.
4) Remove the five screws for fixing the main PCB’s
installation plate.
Grounding screw
Connector
5-9
Chapter 5 Disassembly
5-10. Replacement of the Ozone filter
1) Open the upper unit and remove the developing
unit and the drum unit.
2) Push the edge of the front side of the ozone filter
to take it out from hooks of the holder, then remove
the ozone filter.
Fixing unit
Ozone filter
3) Install the new ozone filter by catching it on the
hooks of the holder. (It is easy to install the new
ozone filter from the upper side of the holder.)
PUSH
5-10
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