Star Micronics WinType 4000 Technical Manual
WinType 4000
T
ECHNICAL MANUAL
[ SECOND EDITION ]
LASER PRINTER
NOTICE
• All rights reserved. Reproduction of any part of this manual in any
form whatsoever, without STAR’s express permission, is forbidden.
• The contents of this manual are subject to change without notice.
• All efforts have been made to ensure the accuracy of the contents
of this manual at the time of going to press. However, should any
errors be detected, STAR would greatly appreciate being informed of them.
• The above notwithstanding, STAR can assume no responsibility
for any errors in this manual.
Trademark acknowledgments
Windows
: Microsoft Corporation
© Copyright 1996 Star Micronics Co.,Ltd.
INTRODUCTION
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3
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5
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This manual describes the WinType 4000 laser printer.
It is intended for use as a reference when performing maintenance procedures.
This manual is prepared for use at a technical level and is not for the general user.
This manual is divided into the following sections:
Chapter 1 General Specifications
Specifications, safety information
Chapter 2 Theory of Operation
A description of the principles of the electrical and mechanical systems and their functions
Chapter 3 Parts Replacement and Adjustments
Explanation of disassembly, reassembly, and adjustment procedures
Chapter 4 Maintenance Guide
Contains an overview of steps for recovering from a breakdown, connector layout diagrams, wiring
connections, and other information useful in maintenance operations.
Chapter 5 Troubleshooting
Contains breakdown analysis procedures used when repairing breakdowns.
Chapter 6 Parts List
Illustrations showing disassembly diagrams, part numbers and part names
* In this manual, MCU PWB is the abbreviation for Main Control Unit Printed Wiring Board.
1
CHAPTER 1
GENERAL SPECIFICATIONS
1. GENERAL SPECIFICATIONS................................................................................3
2. SAFETY INFORMATION........................................................................................6
2-1. Power Supply .......................................................................................................... 6
2-2. Drive Parts............................................................................................................... 6
2-3. Safety Devices ........................................................................................................ 6
2-4. Laser safety............................................................................................................. 7
3. PRINTER COMPONENTS......................................................................................8
– 2 –
GENERAL SPECIFICATIONS
– 3 –
GENERAL SPECIFICATIONS
1. GENERAL SPECIFICATIONS
Engine
Printing process Electro-photographic
Resolution 300 x 300 dpi (Smoothing off)
600 dpi class (Smoothing on)
Exposure Semi-conductor laser beam scanning
Fixing Thermal fusing using heated rollers
Printing speed
Warm-up time 45 seconds or less after power on at 22°C (72°F)
(115 volts or 220 volts)
Time for first print 20.5 seconds for Letter paper
21.1 seconds for A4 paper
Continuous printing speed Min. 4 pages per minute for Letter or A 4 size paper
Printable area 4mm in from the edge of the paper on all sides
Paper feed
Input tray Capacity: 100 sheets of standard paper, 30 overhead (OHP) trans-
parencies, 30 label sheets or 10 envelopes
Paper weight: From 60 g/m2 (16 lb.) – 135 g/m2 (36 lb.)
Output tray Face down
Capacity: Approximately 50 sheets
Printing materials
Standard paper XEROX 4024 DP 20 lb 8.5" x 11" cut sheet paper (US)
Special printing OHP film: 8.5" x 11" XEROX, PN 3R2780 (US)
materials A4 XEROX, PN 3R91330 (Europe)
Label: 8.5" x 11" XEROX, PN 3R4469 (US)
A4 XEROX, PN 3R97408 (Europe)
Envelope: Com-10 Monroe Brand, Monarch Monroe Brand
– 4 –
GENERAL SPECIFICATIONS
Toner cartridge
The toner cartridge consists of an OPC drum, developing roller and blades,
primary charge roller, drum cleaner and high definition black toner.
Toner save mode Off/Dark/Medium/Light
Mode Yield
Off Approx. 4000 pages
Dark Approx. 5000 pages
Medium Approx. 5700 pages
Light Approx. 8000 pages
Mean printing life Starter cartridge: 4000 sheets at 5% paper coverage
Replacement cartridge: 4000 sheets at 5% paper coverage
Power specifications
Input line voltage/ For US Voltage Frequency
frequency Min.: 90V 47Hz
Normal: 100/120V 50/60Hz
Max.: 132V 63Hz
For Europe and Asia/Pacific
Voltage Frequency
Min.: 198V 4 7Hz
Normal: 220/240V 50/60Hz
Max.: 264V 63Hz
Power consumption Maximum power consumption when warming-up and printing is as
follows
100/120V Less than 400W (less than 3A)
220/240V Less than 400W (less than 2A)
Environmental specifications Energy Star Compliant
Temperature, humidity Print engine with toner cartridge:
and altitude Operating: 5 – 35°C (41 – 95°F) at 15 – 85% RH (no conden-
sation)
Non-operating: 20 – 40°C (60 – 104°F) at 5 – 95% RH (no conden-
sation)
0 – 2,500 meters (0 – 8,200 feet)
Print engine without toner cartridge:
Non-operating: 20 – 40°C (60 – 104°F) at 5 – 95% RH (no conden-
sation)
0 – 15,000 meters (0 – 49,200 feet)
Acoustic noise Printing: 48 dB (A) or less
Warm up: 38 dB (A) or less
In accordance with ISO 7779
Dust emission Less than 0.1mg/m
3
concentration: Measured in accordance with Mass Measurements Method
– 5 –
GENERAL SPECIFICATIONS
Reliability specifications
MPBF Recommended usage: Average 2,000 pages per month
Maximum 10,000 in any one month
MPBF: 60,000 pages
MTTR Within 30 minutes
Jam ratio 1/1000 using recommended paper
1/100 using special printing materials
Double feed ratio 1/1000 using recommended paper
1/100 using special printing materials
Life 100,000 pages or 5 years
Dimensions 330mm x 235mm x 265mm
(13.0 in. x 9.25 in. x 10.4 in.)
Weight 6.5 kg. (14.3 lbs.) without toner cartridge
7.5 kg. (16.5 lbs.) with toner cartridge
Controller
I/F High speed bi-directional parallel interface
Panel 2 LED lamps (Ready and Error)
Software
Windows Direct (GDI) mode Provides fast, WYSIWYG output from Windows (GDI) mode applica-
tions
PCL mode Provides compatibility with the popular printer languages used in the
LaserJet II series. Both Windows applications and DOS applications
running under Windows can use PCL emulation mode for printing.
PostScript mode Provides compatibility with the sophisticated PostScript language. Both
Windows applications and DOS applications running under Windows can
use PostScript emulation mode for printing.
Paper size
Paper sizes available A4, Letter, Legal, A5, Executive, B5, Com 10, C5, DL, Monarch
in GDI mode
Paper sizes available in A4, Letter, Legal, Executive, Com 10, C5, DL, Monarch
PCL4 emulation
Paper sizes available in A4, Letter, Legal, A5, Executive, B5, Com 10, C5, DL, Monarch
PostScript emulation
– 6 –
GENERAL SPECIFICATIONS
2. SAFETY INFORMATION
In order to prevent accidents from occurring while maintenance is being carried out, all warnings and precautions should
be strictly observed while work is being carried out. Never attempt any kind of dangerous procedure when servicing this
machine.
The precautions noted below only cover a few of the situations which could foreseeably occur during maintenance
operations. Please make sure every safety precaution is observed while work is being carried out.
2-1. Power Supply
In order to prevent electrical shock, burns, damage to the equipment and other problems, always make sure the power
supply is turned off and the power supply cable has been unplugged before maintenance work is carried out.
If the power must be left on in order to measure voltage or for other reasons, make sure sufficient precautions are taken
to prevent electrical shock, and follow the procedures laid down in this manual.
2-2. Drive Parts
Inspection of drive section parts such as sprockets and gears should be carried out using a hand crank.
DANGER: Never inspect these parts while the equipment is in operation!
2-3. Safety Devices
Thorough consideration should be given to safety devices designed to prevent accidents (fuses, interlock switches, etc.)
as well as those handled by the user in the course of operating the equipment (covers, panels, etc.), in order to make sure
they fulfill their function as safety equipment.
DANGER: In order to prevent exposure to the laser beam contained in the printer, the following precautions must
always be strictly observed.
Exposure to the laser beam can result in blindness.
• Never open a cover (ROS assembly) that has the label shown in figure 1-3 on it.
• When disassembling and adjusting the equipment, always make sure the power supply has been
turned off first.
• This equipment is provided with a two-stage safety switch function, so that it can be operated even
with the covers removed, by pressing the interlock switch. When using this method of operation, never
short the other switch at the same time (the second switch is pressed when the actuator at the back of
the EP toner cartridge attachment section is pressed).
• When servicing the printer’s optical system, be careful not to place screwdrivers or other reflective
objects in the path of the laser beam.
Be sure to take off accessories, such as watches and rings, before working on the printer. A reflected
beam, though invisible, can permanently damage your eyes.
Because the laser beam is invisible, be especially careful when servicing the optical system.
Figure 1-1 Itnerlock switch location
Itnerlock switch
– 7 –
GENERAL SPECIFICATIONS
2-4. Laser safety
This printer is certified as a Class 1 laser product. This means that this laser product does not emit harmful laser beams.
This printer emits a Class 3B laser beam, but the beam is entirely enclosed within a protective case and an external cover,
and cannot escape from the printer while the printer is in use.
CLASS 1 LASER PRODUCT.
LUOKAN 1 LASERLAITE.
KLASS 1 LASER APPARAT.
CLASS 3B LASER
WAVE LENGTH 780nm (INVISIBLE)
RATED POWER 5mW
LUOKAN 3B LASER
AALLONPITUUS 780nm (NÄKYMÄTÖN)
TEHO 5mW
Figure 1-3 Caution Label
VARO! Avattaessa ja suojalukitus ohitettaessa olet alttiina näkymättömälle lasersäteilylle. Älä katso
säteeseen.
VARNING! Osynlig laserstrålning när denna del är öppnad och spärren är urkopplad. Betrakta ej strålen.
Laser Klasse 1
Laser de Classe 1
Láser Clase 1
Laser Luokan 1
Laser Klass 1
Figure 1-2 Class 1 Label
– 8 –
GENERAL SPECIFICATIONS
3. PRINTER COMPONENTS
Figure 1-4 External Dimensions Figure 1-5 Rear View
Figure 1-6 Front View
Power release lever
Power switch
Extension bar and
paper support extender
Upper paper tray
330 mm
235 mm
265 mm
Ventillation fan outlet
Front cover
Output paper
extender
Output tray
Ready LED lamp
(Green)
Error LED lamp
(Orange)
Power switch Power card socket
Parallel interface
connector
2
CHAPTER 2
THEORY OF OPERATION
1. PRINTING PROCESS...........................................................................................11
2. PAPER TRANSPORTATION ...............................................................................14
3. FUNCTIONS OF THE MAIN PARTS....................................................................15
3.1 Covers.................................................................................................................... 15
3.2 Feeder & Drive ...................................................................................................... 15
3.3 Fuser & Paper Exit................................................................................................ 17
3.4 Photographics & ROS .......................................................................................... 19
3.5 Electrical................................................................................................................ 21
– 10 –
THEORY OF OPERATION
– 11 –
THEORY OF OPERATION
1. PRINTING PROCESS
The printing process for this system consists of the repetition of the following five basic steps:
Charging Scanning exposure Developing FusingTransfer
(Separation)
(Cleaning)
CM blade
Heat roller
Fuser assembly
Pressure roller
BTR
Drum
Magnetic roller
Ros assembly
BCR
Figure 2-1 Printing Process
: Laser beam
: Paper path
– 12 –
THEORY OF OPERATION
• Description of the Printing Process
Step Details
Charging
The surface of the rotating drum in the EP toner cartridge is uniformly negatively charged
by the electric charge from the BCR (Bias Charge Roller).
The ROS assembly scans the exposure by converting the image signal from the MCU PWB
into an optical signal (laser beam) and directs the laser beam onto the drum.
Scanning Exposure When an image is present, a laser is emitted and the laser beam is irradiated onto the surface
of the drum causing the irradiated area to be set to a neutral charge, thus enabling an
invisible latent electrostatic image to be formed on the drum’s surface.
The latent electrostatic image on the drum’s surface attracts toner from the surface of the
magnetic roller in the EP toner cartridge, forming a visible image on the surface of the drum.
Developing
The magnet inside the magnetic roller causes the toner, which also has magnetic properties,
to adhere to the roller while the friction between the rotating magnetic roller and the CM
blade (Charge Metal Blade) negatively charges the toner, so that a thin layer of toner is n
the surface of the magnetic roller.
Transfer
A positive charge is applied to the back of the paper by the BTR (Bias Transfer Roller)
causing the toner on the drum’s surface to be transferred to the paper.
Applying a positive charge to the back of the paper causes the paper itself to be positively
charged, so that the paper adheres to the drum
(Separation)
The firmness of the paper causes the paper with the toner affixed to it to be separated from
the drum.
Fusing
The heat from the heat roller heated by the heat rod and the pressure from the pressure roller
causes the toner to be fused to the paper in the fuser assembly.
(Cleaning)
Any residual toner remaining on the drum after the transfer step is scraped off by the
cleaning blade which is in contact with the drum’s surface.
–350V
0
–V
–350V
0
–V
–350V
0
–V
–210V
(Developing bias)
Laser beam
Scanning Exposure DevelopingCharging
Toner image
(Visible image)
Electrostatic latent
image (Invisible image)
Drum’s surface
Voltage
Figure 2-2 Printing Process (Drum’s Surface)
– 13 –
THEORY OF OPERATION
Cleaning blade
BCR
AC Bias: 1.6kVp-p
(f=2.4kHz)
DC Bias: –210V
Laser beam
Toner
DC Bias
(+): 250V~2600V
(0.5µA~1.6µA)
(–): –700V
Magnetic roll
AC Bias: 200µA
(f=160Hz)
DC Bias: –350V
Paper
Eliminator
Pressure roll
BTR
Drum
( 30mm)
CM blade
Toner
17.28
Heat roll
17
Transfer
Scanning Exposure
152˚C 140˚C
158˚C 150˚C
Separation
While the lamp
flashes
six times
After the lamp
flashes
the sixth time
Developing
Charging
Heat roll
Figure 2-3 Printing Process (Seven Steps)
– 14 –
THEORY OF OPERATION
- - -
: Transport path of the paper
Input tray assembly
Feeder assembly
Heat roller
Pinch roller
Exit roller
Delivery tray assembly
Fuser assembly
Pressure roller
Drum
BTR
Feed roller
Figure 2-4 Paper Transportation
2. PAPER TRANSPORTATION
The following diagram shows the order in which paper passes over the rollers.
Paper that is inserted is automatically fed.
Paper is supplied and transported by the feed roller.
Paper is transported by the drum and BTR assembly.
Paper is transported by the heat roller and pressure roller.
Paper is discharged by the exit roller in the fuser assembly and the pinch roller in the
fuser top cover assembly.
– 15 –
THEORY OF OPERATION
3. FUNCTIONS OF THE MAIN PARTS
The main parts are briefly described and illustrated as follows. In order to remain consistent with the parts list, parts are
divided into the following five sections based on their type.
1 Covers
2 Feeder & Drive
3 Fuser & Paper Exit
4 Photographics & ROS
5 Electrical
3.1 Covers
This consists of the printer, four covers and two trays.
(Refer to Chapter 6, Parts List)
3.2 Feeder & Drive
• Input Tray Assembly
Regular (cut sheet) paper, envelopes can be fed into the printer from this tray.
Slide the left and right paper guides to hold the paper in place.
• Feed Roller Assembly
This assembly consists of the feed roller and the feed clutch. After the spring clutch in the feed clutch has been set by
the movement of the feed solenoid, the feed roller assembly rotates driven by the drive assembly and the feed rollers
feed the paper into the printer from the input tray assembly.
One full rotation of the feed roller assembly causes the spring clutch to be released by the feed solenoid and disables
the drive assembly from transmitting a driving signal.
• Feed Solenoid
The feed solenoid controls the operations (rotation and stop) of the feed roller assembly.
• Pre-regi. Sensor
This sensor detects whether paper is sent by the paper set lever based on changes in the position of the regi. actuator
and sends a signal to the MCU PWB.
• MCU PWB
The MCU PWB controls the regi. solenoid, rotates the feed roller assembly and feeds the paper into the printer with
the paper set lever. After receiving the signal from the regi. sensor, the MCU PWB instructs the EP toner cartridge to
generate the image.
(Refer to section 3.5 Electrical System. Illustrations of the parts described above are shown in Chapter 6, Parts List
PL5.)
• Drive Assembly
The drive assembly consists of the main motor and the gear that transmits the driving force. This assembly transmits
a driving force by rotating the main motor.
– 16 –
THEORY OF OPERATION
Feed clutch
Feed solenoid
Feed roller assembly
Paper set lever
Retard pad
Pre-regi. sensor
Figure 2-5 Feeder & Drive
Drive assembly
Main motor
Paper set lever
Input tray assembly
Feed roller
– 17 –
THEORY OF OPERATION
3.3 Fuser & Paper Exit
• Fuser Assembly
The fuser assembly includes the heater rod, heat roller, pressure roller, thermostat, thermistor and exit sensor. This
assembly fixes the toner onto the paper using heat and pressure, then outputs the printed paper.
Parts in the fuser assembly are referred to as fusers.
Heater Rod
The heater rod is a lamp with a heated coil sealed inside it and serves as the heat source inside the heat roller.
Heat Roller
The hollow, metal heat roller is coated on the surface and provides the heat to fuse the toner to the paper.
Pressure Roller
The rubber pressure roller provides the pressure to fuse the toner to the paper.
Thermistor
The thermistor is in contact with the heat roller and responds to its surface temperature.
When the heater rod is ON (a light is on), the thermistor controls the ON/OFF position of the heater rod according
to the temperature detected and prevents excessive increases in the primary temperature.
Thermostat
The thermostat is in series with the power supply in the heater rod. If the thermistor fails to prevent an excessive
increase in the (primary) temperature, the thermostat prevents an excessive increase in the secondary temperature
by opening the point of contact that results when the ambient temperature reaches a set level.
Thermal Fuse
The thermal fuse is in series with the heater rod circuit. If the thermistor fails to prevent the (primary) temperature
from getting too high and the thermostat fails to prevent the (secondary) temperature from getting too high, the
fuse will prevent tertiary overheating by melting when the ambient temperature reaches a set level.
Exit Roller
After fusing the toner onto the paper, the exit roller passes the printed paper out of the printer.
Exit Sensor
The exit sensor detects the state of the printed paper in the exit area in response to changes in the position of the
exit actuator. The exit sensor is turned ON when the presence of the printed paper is detected.
– 18 –
THEORY OF OPERATION
Heat roller
Thermostat
Thermal fuse
Thermister
Exit sensor
Exit roller
Pressure roller
Heater rod
Pinch roller
Pinch roller
Pressure roller
Heat roller
Exit roller
Figure 2-6 Fuser & Paper Exit
– 19 –
THEORY OF OPERATION
3.4 Photographics & ROS
• HVPS (HVPS: High Voltage Power Supply)
The HVPS supplies voltage/current to the BCR, magnetic roller, BTR and drum during the charging, developing and
transfer steps. It also supplies current to the fan. (The front cover interlock switch is mounted onto the HVPS.)
• ROS Assembly (ROS: Raster Output Scanner)
The ROS assembly consists of the LD assembly, the scanner assembly, the SOS PWB and the mirror. Parts in the ROS
assembly are referred to as ROS items.
LD Assembly (LD: Laser Diode)
The LD assembly converts electrical signals into a laser beam and emits light.
The laser diode output (LD power) is kept constant and transmitted through the monitor’s circuits.
Scanner Assembly
A polygonal mirror with four specular surfaces is mounted on the scanner motor which rotates at a constant speed.
The rotation of the polygonal mirror changes the laser beam’s angle of reflection and causes one surface of the
mirror to scan one line (in the direction of the drum’s axis).
The laser beam reflected by the polygonal mirror is irradiated onto the drum’s surface via the lens and mirror.
SOS PWB (SOS: Start of Scan)
The irradiation of the laser beam onto the SOS sensor causes the laser beam to be converted into an electrical signal
(SOS signal) and allows the initial scanning position of a line to be detected.
• CRU Sensor PWB (CRU: Customer Replaceable Unit)
The CRU sensor consists of a CRU switch which detects the presence of the EP toner cartridge and is turned ON or
OFF in response to the CRU actuator. The CRU switch is in series with the circuit emitting the laser beam and ensures
the safety of the laser beam.
• EP toner cartridge (EP: Electrical Photographics)
The EP toner cartridge consists of the drum, BCR, magnetic roller, CM blade and cleaning blade.
Drum
The drum is constructed of an aluminum cylinder covered with an OPC (organic photo conductor) sensitive material with
photoconductive properties (the ability to retain the electric charge in darkness and set the charge to neutral in light). The drum
produces a printed image based on the potential difference (latent electrostatic image) on its surface.
BCR (BCR: Bias Charge Roller)
The BCR sets the drum’s surface to a uniform electrical charge.
Magnetic Roller
The magnetic roller supplies toner to the drum for developing a latent electrostatic image on the surface of the drum.
BTR (BTR: Bias Transfer Roller)
The BTR applies a positive charge to the back of the paper and transfers the toner from the drum’s surface to the paper.
CM Blade (CM: Charge Metal)
The CM blade not only uniformly controls the amount of toner on the surface of the magnetic roller, but also uses friction to
give the toner its electric charge.
Cleaning Blade
The cleaning blade cleans the surface of the drum by scratching off the residual toner after the transfer step.
– 20 –
THEORY OF OPERATION
Mirror
Scanner assemblyLD assembly
ROS assembly
SOS PWB
Magnetic roller
BTR
Drum
BCR
CM blade
EP toner cartridge
HVPS
CRU sensor
Figure 2-7 Photographics & Ros
– 21 –
THEORY OF OPERATION
3.5 Electrical
• LED & LED PWB
The condition of the printer is displayed by LEDs (green/orange) and can be confirmed by observing these LEDs.
• LVPS Assembly (LVPS: Low Voltage Power Supply)
The LVPS assembly not only supplies AC power from the power supply to the heater rod in the fuser assembly, but
also generates and supplies a stable low-voltage DC power for use in the logic circuitry, etc.
It includes a main power switch which is used to turn the main power supply to the printer ON or OFF.
• MCU PWB
The MCU PWB controls the whole printing operation.
Its main functions are as follows:
(1) Receive information from the sensors and switches
(2) Control the ROS, fuser and drive assemblies
(3) Control the printing sequence
(4) Distribute low-voltage DC power from the LVPS assembly to each component
• Front Cover Interlock Switch
The interlock switch is a safety switch which completes or breaks the AC power circuit and the low-voltage (24V) DC
power circuit (but not the power supply to the fan) when the front cover assembly is closed or opened (the switch is
pressed or released). (This switch is mounted onto the HVPS.)
• Fan
The fan receives power from the HVPS and draws in air which is used to lower the internal temperature of the system,
thereby preventing it from increasing.
(Refer to section 1.2 Parts List in chapter 6, Parts List.)
Figure 2-8 Electrical
LVPS assembly
Main power switch
Front cover Interlock switch
LED PCW
MCU PWB
LED (orange)
LED (green)
Fan
– 22 –
THEORY OF OPERATION
Figure 2-9 Electrical
CHAPTER 3
REPLACEMENT AND ADJUSTMENTS OF PARTS
This chapter explains adjustment, disassembly and reassembly of the printer. The following precautions should be
noted during disassembly and reassembly:
1. Disconnect the printer from the wall outlet before servicing it.
2. Unless otherwise specified, the printer is assembled by reversing the disassembly procedure.
3. Do not operate the printer with any parts removed.
4. When you remove the EPX toner cartridge, be sure to keep the cartridge in its original box. If the box is not
available, cover the cartridge with a cloth or put it in a dark place to prevent light from affecting the drum inside
the cartridge.
3
1. COVERS ..............................................25
1.1 Front Cover .................................... 25
1.2 Top Cover ....................................... 26
1.3 Rear Cover...................................... 27
1.4 Bottom Cover ................................. 28
1.5 Fan .................................................. 29
2. FEEDER & DRIVE ...............................30
2.1 Feeder Assembly ........................... 30
2.2 Feed Roller Assembly ................... 31
2.3 Feed Solenoid ................................ 32
2.4 Paper Set Lever.............................. 33
2.5 Retard Pad...................................... 34
2.6 Pre-Regi. Sensor............................ 35
2.7 Drive Assembly.............................. 36
2.8 Main Motor...................................... 37
3. FUSER .................................................38
3.1 Fuser Assembly ............................. 38
3.2 Pressure Roller .............................. 39
3.3 Heater Rod...................................... 40
3.4 Heat Roller...................................... 42
3.5 Thermostat ..................................... 43
3.6 Thermal Fuse ................................. 44
3.7 Thermistor ...................................... 45
3.8 Exit Sensor ..................................... 46
4. ROS......................................................47
4.1 ROS Assembly ............................... 47
4.2 SOS Sensor Assembly .................. 48
4.3 Laser Diode .................................... 49
4.4 Scanner Assembly......................... 50
4.5 Mirror .............................................. 51
4.6 HVPS ............................................... 52
4.7 Front Cover Interlock Switch
Actuator .......................................... 53
4.8 CRU Sensor PWB & Actuator ....... 54
5. ELECTRICAL SYSTEM....................... 55
5.1 PWB Chassis.................................. 55
5.2 MCU PWB ....................................... 56
5.3 LVPS Assembly ............................. 57
– 24 –
REPLACEMENT AND ADJUSTMENT OF PARTS
– 25 –
REPLACEMENT AND ADJUSTMENT OF PARTS
Be sure that the power is disconnected!
1. COVERS
1.1 Front Cover
[Disassembly]
Warning: Turn off the power switch and disconnect the power supply cord from the wall outlet.
(1) Grasping the left and right sides of the front cover [1], open it by pulling it down.
(2) Remove the EP toner cartridge and keep it in a safe place.
(3) Pressing down on the center of the printer with one hand, separately unhook the left and right hinges
[2] on the front cover [1] and remove the front cover.
[Assembly]
Reverse the disassembly procedure.
[1]
[2]
– 26 –
REPLACEMENT AND ADJUSTMENT OF PARTS
1.2 Top Cover
[Disassembly]
Warning: Turn off the power switch and disconnect the power supply cord from the wall outlet.
(1) Open the front cover [1], remove the EP toner cartridge and keep it in a safe place.
(2) Remove the two screws [2] that can be seen when the front cover is opened.
(3) While pressing down on the center of the printer with one hand, separately unhook the left and right
bosses [3] on the input tray assembly [4] and remove the input tray assembly.
Caution: In order to illustrate the positions of the screws in relation to the input tray assembly, fig.
(4) Remove the two screws [5] revealed when the input tray assembly is removed and raise the top cover
[6] a few centimeters.
(5) Raise the top cover to disconnect PJ321 [7] from the LED PWB.
[Assembly]
Reverse the disassembly procedure.
Caution: When installing the top cover [1] on the printer, be sure that the harness is not pinched between any other
parts.
[1]
[2]
[5]
[6]
[3]
[4]
[7]
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