Star Micronics LS-5 SERIES Technical Manual

LASER PRINTER

LS-5 SERIES

TECHNICAL MANUAL

[SECOND EDITION]

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.

© Copyright 1992 Star Micronics Co.,Ltd.

INTRODUCTION

This manual is an introduction to the laser printer as shown below.
It is intended for use as a reference for maintenance procedures.
This manual is prepared for use at a technical level and not for the general user.

• LS-5EX

• LS-5TT

• LS-5

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2

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 to assist in recovering from a breakdown, connector layout diagrams, wiring
connections, and other information helpful in maintenance operations.

Chapter 5 Troubleshooting

Contains breakdown analysis procedures used in repairing breakdowns.

Chapter 6 Parts List

Illustrations showing disassembly diagrams, part numbers, and part names

• First edition : Dec. 1992

Second edition : Feb. 1993 Add LS-5 model

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5
6

GENERAL SPECIFICATIONS

– 2 –

CHAPTER 1

GENERAL SPECIFICATIONS

1. General Specifications..........................................................................................3

2. Pin Functions on Interfaces .................................................................................5

2-1. Parallel Interface ..................................................................................................... 5

2-2. Serial Interface........................................................................................................ 5

2-3. AppleTalk Interface................................................................................................. 5

3. Safety Information.................................................................................................6

3-1. Power Supply.......................................................................................................... 6

3-2. Drive Parts............................................................................................................... 6

3-3. Safety Devices ........................................................................................................ 6

1

3-4. Laser safety............................................................................................................. 7

4. Printer Components..............................................................................................8

GENERAL SPECIFICATIONS

– 2 –

GENERAL SPECIFICATIONS

1. General Specifications

(1) Type Desk-top page printer
(2) Printing method Electro photography
(3) Printing speed 5 pages/min (A4 size)

3.56 pages/min (legal size)
(4) Time for first print 27 seconds or less
(5) Warm-up time 1 min or less (after power on until the printer warms up at ambient

temperature of 20°C with rated AC voltage input)

(6) Optical system

Laser Semiconductor laser beam
Scanning system Rotating scanning mirror
Scanning pitch

Horizontal 300 dots/inch
Vertical 300 rasters/inch

(7) Printing system

Photosensitive drum OPC
Exposure method Laser scanning system
Paper feed Cassette feed

Front paper tray feed
Fusing method Thermal fusing by heated rollers
Toner supply Included in replaceable EPX toner cartridge

(8) Paper feed sources

Standard 250-sheet deck with cassette

50-sheet front paper tray
Option 250-sheet deck with cassette

500-sheet deck with cassette

(9) Paper

250 universal cassette

Paper size Letter (8.5" × 11"), A4, Executive, B5
Capacity 250 sheets, or maximum 27 mm loading height

250 legal cassette

Paper size Legal 14" (8.5" × 14"), Letter (8.5" × 11")
Capacity 250 sheets

250 envelope cassette

Paper size COM-10, Monarch, DL, C5
Capacity 30 envelopes

500 letter cassette

Paper size Letter (8.5" × 11")
Capacity 500 sheets

500 A4 cassette

Paper size A4
Capacity 500 sheets

500 B5 cassette

Paper size B5
Capacity 500 sheets

Front tray

Paper size Letter (8.5" × 11"), A4, Envelopes
Capacity 50 sheets or 5 envelopes

(10) Paper weight (plain paper)

Front paper tray 60 g/m2 to 135 g/m
Cassette feed 60 g/m2 to 105 g/m

(11) Print delivery Face-down

2
2

– 3 –

GENERAL SPECIFICATIONS

(12) Acoustic noise (in accordance with ISO 7779)

Stand by 37 dB or less
Printing 45 dB or less

(13) Environment

Printer with EPX toner cartridge

Operating temperature 5°C to 35°C
Operating humidity 15% to 85%RH (without condensation)
Storage temperature –20°C to 40°C
Storage humidity 5% to 95% (without condensation)
Altitude 0 to 8200 feet (0 to 2500 meters)

Printer without EPX toner cartridge

Storage temperature –20°C to 60°C
Storage humidity 5% to 95% (without condensation)
Altitude 0 to 49200 feet (0 to 15000 meters)

(14) Power consumption

100 - 115V Max. 450W
220 - 240V Max. 500W

(15) Printable area The guaranteed printing requires a margin of 4 mm from each edge of the

paper.

(16) Dimensions (W × D × H) 352mm × 393.5 mm × 253mm
(17) Weight Approx. 12kg (without EPX toner cartridge)
(18) Line voltage Rating Range

Voltage 100 - 115V 90 to 132V

220 - 240V 198 to 264V
Frequency 50/60Hz 47Hz to 63Hz

(19) Host interface

LS-5EX

Parallel Centronics
Serial RS-232C
Optional AppleTalk (when an optional ROM board MS is installed)

LS-5TT

Parallel Centronics
Serial RS-232C

AppleTalk
LS-5

Parallel Centronics
Serial RS-232C/RS-422A

(20) RAM

Resident 1MB (LS-5EX)

2MB (LS-5TT)

0.5MB (LS-5)

Option Max. 6MB on RAM expansion board (LS-5EX/TT)

Max. 4MB on RAM expansion board (LS-5)

(21) Emulation

LS-5EX Standard: PCL5 and GL/2(HP Laserjet 3)

Option: TrueImage (with optional ROM board MS)
LS-5TT PCL5 and GL/2(HP Laserjet 3)

TrueImage (Apple LaserWriter NTX)
LS-5 PCL4 (HP LaserJet IIP)

ESC/P (Epson FX-286)

(22) Font

Resident 14 bitmap fonts

8 scalable fonts (LS-5EX/TT)

35 TrueType scalable fonts (LS-5TT only)
Option Font cartridge

– 4 –

GENERAL SPECIFICATIONS

2. Pin Functions on Interfaces

2-1. Parallel Interface

Pin No.
1 STROBE IN Goes from High to Low (for at least 0.5 microseconds) when data are valid.

2 DATA1 IN
3 DATA2 IN
4 DATA3 IN
5 DATA4 IN
6 DATA5 IN
7 DATA6 IN
8 DATA7 IN
9 DATA8 IN
10 ACK OUT A low pulse acknowledges receipt of data.
11 BUSY OUT Low when the printer is ready to receive data.
12 PAPER OUT OUT Goes High if the printer runs out of paper.
13 SELECTED OUT High when the printer is online.
14-15 N/C Unused
16
17
18 +5VDC OUT External supply of +5VDC
19-30 GND Twisted pair return signal ground level.
31 PRIM IN LS-5 model does not check this signal.

32 FAULT OUT Goes Low to signal that the printer cannot print due to an error condition.
33-36 N/C Unused. In case of LS-5 model, pin no. 33 and 35 are always HIGH.

Signal

Name

SIGNAL GND
CHASSIS GND

Direction Function

Eight-bit character data. DATA8 is the most significant bit; DATA1 is the least significant bit.
High is logic 1 and low is logic 0.

Signal ground
Printer’s chassis ground, isolated from signal ground.

LS-5EX and TT are not connected.

2-2. Serial Interface

Pin No.
1 GND 232C/422A Chassis ground

2 TXD OUT RS-232C Transmitted data
3 RXD IN RS-232C Received data

4 RTS OUT RS-232C SPACE when the printer is ready to receive data.

5-6 N/C Unused
7 GND 232C/422A Signal Ground
8 N/C Unused
9 TXD+ OUT RS-422A Transmitted data+
10 TXD– OUT RS-422A Transmitted data–
11-17 N/C Unused
18 RXD+ IN RS-422A Received data+
19 N/C Unused
20 DTR OUT RS-232C SPACE when the printer is ready to receive data.
21-25 N/C Unused

Signal

Name

RXD– IN RS-422A Received data–

Direction Interface Function

But this printer does not check the signal.

2-3. AppleTalk Interface

Pin No.
1 HSKo OUT Handshake out (always GND)

2 HSKi IN Handshake in
3 TXD– OUT Transmitted data –
4 GND Signal ground
5 RXD– IN Received data –
6 TXD+ OUT Transmitted data +
7 N/C Unused
8 RXD+ IN Received data +

Signal

Name

Direction Function

– 5 –

GENERAL SPECIFICATIONS

3. Safety Information

In order to prevent accidents from occurring while maintenance is being carried out, all warnings and precautions should
be strictly observed while working. Never attempt any kind of dangerous work when servicing this machine.
The precautions noted below are only a few of the situations which could foreseeably occur during maintenance
operations. Please make sure every safety precaution is observed while working.

3-1. 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 noted in this manual.

3-2. 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!

3-3. 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 cover (ROS assembly) that has the label of figure 1-2.

• 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 EPX
toner cartridge attachment section is pressed).

• When servicing the optical system of the printer, 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.

– 6 –

GENERAL SPECIFICATIONS

3-4. 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 leak from the printer while the printer is in use.

CLASS 1 LASER PRODUCT.
LUOKAN 1 LASERLAITE.
KLASS 1 LASER APPARAT.

Figure 1-1 Class 1 Label

CLASS 3B LASER
WAVE LENGTH 780nm (INVISIBLE)
RATED POWER 5 m W

LUOKAN 3B LASER
AA LLON PIT UUS 780nm (NÄKYMÄTÖN)
TEHO 5m W

Figure 1-2 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.

– 7 –

GENERAL SPECIFICATIONS

4. Printer Components

Figure 1-3 External Dimensions

Figure 1-5 Rear View Figure 1-6 Inside View

Figure 1-4 Front View

– 8 –

CHAPTER 2

THEORY OF OPERATION

1. Printing Process..................................................................................................11

2. Paper Transportation ..........................................................................................14

3. Functions of Main Parts......................................................................................15

3-1. Cassette Feed.......................................................................................................... 15

3-2. Paper Transportation .............................................................................................. 17

3-3. Fusing and Paper Exit............................................................................................. 19

3-4. Drive and Photographics........................................................................................ 20

3-5. Electrical .................................................................................................................. 22

2

THEORY OF OPERATION

– 10 –

THEORY OF OPERATION

1. Printing Process

The printing process of this system consists of repetition of the following basic seven steps:

Charging Scanning exposure Developing Transfer Separation Fusing Cleaning

The following schematic diagram will help to explain the printing process.

Figure 2-1 Printing Process

– 11 –

: Laser Beam
: Paper Path

THEORY OF OPERATION

• Descriptions of Printing Process

Process Contents

Charging The surface of the drum rotated by the BCR (bias charge roll) in the EPX toner cartridge

is negatively charged uniformly.
The ROS assembly converts image signals from the main logic board into optical signals

(laser beam), the laser beam scanning on the drum enabling exposure.

Scanning Exposure When an image is present, a laser is emitted. The laser beam is irradiated on the drum

surface, the negative charge of irradiated portions moves to the earth, thus enabling an
invisible electrostatic latent image to be formed on the drum surface.

The electrostatic latent image on the drum surface attracts toner on the magnetic roll surface
in the EPX toner cartridge, which is developed into a visible image on the drum surface.

Developing The toner is magnetic component. The magnet inside the magnetic roll causes the toner to

adhere to the roll, and the friction between the magnetic roll as it rotates and the CM
blade(Charge Metal Blade:the blade which charges the toner) converts the toner to a
negative charge, so that a thin layer of toner is formed on the surface of the magnetic roll.

The positive charge is impressed from the back of paper by the BTR (Bias Transfer Roll)
of the BTR assembly, thereby enabling toner on the drum surface to be transferred on the
paper.Transfer
Impressing plus charge from the back of paper causes the paper itself to be electrically
charged plus to adhere to the drum.

Separation

Fusing

Cleaning

Drum’s Surface

Voltage

The eliminator of the trans. chute assembly causes electric charge of the paper to flow to the
earth to weaken the adhesion to the drum of the paper, and the flexibility of the paper enables
the paper together with transferred toner to be separated from the drum.

Toner on the paper is fused on it in the fuser assembly by means of heat of the heat roll with
the heater rod as a heat source and pressure of the pressure roll.

Part of toner not transferred on the paper during transfer remains on the drum. This residual
toner is scraped away by the cleaning blade in contact with the drum surface.

Charging Scanning Exposure Developing

Laser Beam

–V

Electrostatic Latent
Image (Invisible Image)

–V

–360V

0

0

–360V

–V

Toner Image
(Visible Image)

–360V
–270V

(Developing Bias)

0

Figure 2-2 Printing Process (Drum’s Surface)

– 12 –

Pressure Roll

THEORY OF OPERATION

(φ19.65mm)

Fusing

(φ19.65mm)

Paper

Eliminator

Separation

Transfer

BTR

DC Bias
(+): 1.5µA (1000V)
(–): –600V

Magnetic Roll

Toner

Cleauing

Drum
(φ30mm)

Heat Roll
Stand by: 150°C
Printing: 160°C

Cleaning Blade

BCR

Charging

Laser Beam

Scanning Exposure

Toner
CM Blade

Developing

AC Bias: 1.6kVp-p (f=2.4kHz)

AC Bias: 200µA
(f=150Hz)
DC Bias: –360V

DC Bias: –270V

Figure 2-3 Printing Process (Seven Steps)

– 13 –

THEORY OF OPERATION

2. Paper Transportation

Paper transportation by the rolls is shown sequentially as follows:

Cassette feed Multi-purpose tray feed

Feed by the feed roll Feed by the pick up roll of the pick up roll assembly

Paper transportation by the turn roll of the turn roll

assembly and the pinch roll of the paper cassette

Paper transportation by the take away roll of the take away roll assembly and the pinch roll of the pick up

roll assembly

Paper transportation by the drum and the BTR of the BTR assembly

Paper transportation by the heat roll and the pressure roll

Paper exit by the exit roll of the exit roll assembly and the pinch roll of the fuser cover assembly

Figure 2-4 Paper Transportation

– 14 –

: Laser Beam
: Paper path

THEORY OF OPERATION

3. Functions of Main Parts

The following are brief descriptions with corresponding illustrations of the main parts. They are divided into the following
five blocks according to their architecture:

1. Cassette Feed

2. Paper Transportation

3. Fusing and Paper Exit

4. Drive and Photographics

5. Electrical

3-1. Cassette Feed

[1] Paper Cassette:

A cassette to hold cut sheets of paper.
Aligning the paper guide in the rear side to the paper causes the cam in the right rear to rotate, thereby changing the
location where the size spring is pressed.
A pinch roll corresponding to the turn roll of the turn roll assembly is also mounted.

[2] Feeder PCB (PCB: Printed Circuit Board):

The paper size switch and the no paper sensor are directly mounted on the board, the former detecting the cassette
paper size and the presence of the paper cassette with a combination of ON and OFF operations of the switches
according to the changes in the location of the size spring and the latter detecting the presence of sheets of paper in
the paper cassette.
With the no paper sensor, the state of the presence of sheets of paper being not detected shall be OFF.

[3] Feed Solenoid:

Controls operations (rotation and stop) of the feed roll assembly.

[4] Feed roll assembly:

Comprises a feed roll and feed clutch assemblies. When the feed solenoid is actuated, the spring clutch of the feed
clutch assembly becomes fixed, the feed roll assembly rotates by the drive from the drive assembly, the feed roll
delivering sheets of the paper from the cassette.
One full rotation of the feed roll assembly causes the spring clutch to be released, thus disabling the drive of the drive
assembly from being transmitted.

[5] Turn Solenoid:

Controls operations (rotation and stop) of the turn roll assembly (only when it receives PRFD (prefeed) signals from
the main logic board).

[6] Turn Roll Assembly:

When receiving a PRFD (prefeed) signal from the main logic board, the turn solenoid is actuated to cause the spring
clutch of the turn roll assembly to be released, thus stopping transmission of the drive from the drive assembly and
paper transportation, allowing the turn roll assembly to wait in front of the regi. sensor.
The turn solenoid,on receiving a START signal from the main logic board, stops operating to cause the spring clutch
to be fixed, the turn roll assembly rotating by the drive from the drive assembly to deliver sheets of paper.
When receiving no PRFD signal, the turn roll assembly is constantly transmitted the drive from the drive assembly
to deliver sheets of paper.

– 15 –

THEORY OF OPERATION

Figure 2-5 Cassette Feed

– 16 –

THEORY OF OPERATION

3-2. Paper Transportation

[1] MBF Sensor (MBF: Multi-sheet Bypass Feed):

Detects the presence of sheets of paper in the multi-purpose tray (front tray assembly) according to change in the
position of MBF actuator. It assumes ON state when the presence of the paper is being detected.

[2] Pick up Solenoid:

Controls operations (rotation and stop) of the pick up roll assembly.

[3] Pick up Roll Assembly:

Activation of the pick up solenoid causes the spring clutch of the pick up roll assembly to be fixed and rotate due to
the drive from the drive assembly, causing the cam of the pick up roll assembly to operate the bottom plate assembly
vertically, thus the pick up roll of the pick up roll assembly delivering sheets of paper from the multi-purpose tray
(front tray assembly).
One full rotation of the pick up roll assembly causes the spring clutch to be released, thus disabling the drive from
the drive assembly from being transmitted.
A pinch roll corresponding to the take away roll of the take away roll assembly is also mounted.

[4] Inlet Chute Assembly:

Comprises an inlet chute and a regi. sensor.

• Inlet Chute:

Not only serves as a paper path but moves the electrical charge of pretransfer sheets of paper to the earth by a
metallic plate, improving transfer efficiency.

• Regi. Sensor (Regi.: Registration):

Detects the state of paper transportation in the inlet chute area. It assumes ON state when the presence of the paper
is being detected.

[5] BTR Assembly (BTR: Bias Transfer Roll):

The BTR, a component, comes into contact with the EPX toner cartridge drum, impresses the positive electrical
charge from the back of sheets of paper, thus transferring toner on the drum surface on them.

[6] Trans. Chute Assembly (Trans.: Transport):

It not only serves as a paper transport path but moves to the earth the electrical charge of post-transfer sheets of paper
and that from the BTR by means of the eliminator.

[7] Console Assembly:

Performs various display by means of the LCD and various inputs with the key switch.

[8] Lower Chute Assembly:

Comprises a take away roll assembly and a retard pad assembly.

• Take Away Roll Assembly:

Transports sheets of paper to the drum by the take away roll of the take away roll assembly.

• Retard Pad Assembly:

Prevents duplicate paper transportation during paper delivery by the pick up roll assembly.

[9] Link Assembly:

Not only regulates the opening of the front cover assembly but depresses the interlock switch of the LVPS assembly
when the front cover assembly is closed, opening the drum shutter of the EPX toner cartridge.

– 17 –

THEORY OF OPERATION

Figure 2-6 Paper Transportation

– 18 –

THEORY OF OPERATION

3-3. Fusing and Paper Exit

[1] Fuser Assembly:

Comprising a heater rod, heat roll, pressure roll, temp. sensor assembly, thermostat and fuse, it fuses, on a sheet of
paper, toner transferred on it by heat and pressure.
The items related to the fuser assembly are referred to as fuser.

• Heater Rod:

A lamp with a heated coil sealed in it, located inside of the heat roll, serving as a heat source of the heat roll.

• Heat Roll:

Provides heat for fusing toner on sheets of paper.

• Pressure Roll:

Provides pressure for applying toner on sheets of paper.

• Temp. Sensor Assembly (Temp.: Temperature):

Detects surface temperature of the heat roll with which the thermistor (electric resistor to react with temperature
change) is in contact.
Based on surface temperature of the heat roll thus detected, it controls ON/OFF operations of the heater rod and
prevents excessive rise in primary temperature.

• Thermostat:

In series with the power supply of the heater rod, it prevents excessive rise in secondary temperature through
opening of the contact resulted when secondary temperature reaches the constant ambient temperature if the
preventive function by the thermistor against excessive rise in temperature (primary) fails.

• Fuse:

This is inserted next to the power supply of the heater rod. If a problem occurs such as overheating caused by the
thermistor(primary)and then by the thermostat(secondary), the fuse melts when the ambient temperature reaches
a certain level, to prevent tertiary overheating.

[2] Exit Sensor:

Detects the state of printing paper transportation in the exit area.
The state of printing paper being detected shall be ON.

Figure 2-7 Fusing and Paper Exit

– 19 –

THEORY OF OPERATION

3-4. Drive and Photographics

[1] Drive Assembly:

Comprises a main motor and gears to transmit its drive, providing mechanical drive by rotation of the main motor.

[2] ROS Assembly (ROS: Raster Output Scanner):

Comprises an LD assembly, scanner assembly, SOS PCB, lens, mirror and window. The items related to the ROS
assembly are referred to as ROS.

• LD Assembly (LD: Laser Diode):

Converts electric signals into a laser beam, emitting light.
Power of a laser diode (LD power) is controlled to be constant through the monitor circuit.

• Scanner Assembly:

A polygon mirror with six specular surfaces is mounted on the scanner motor to rotate at a constant speed. The
rotation of the polygon mirror causes angles of incidence and reflection of a laser beam to change, one surface of
the polygon mirror scanning one line in direction of the drum axis.
A laser beam reflected by the polygon mirror is irradiated on the drum surface via the lens, mirror and window.

• SOS PCB (SOS: Start Of Scan):

The irradiation of a laser beam on the SOS sensor causes the laser beam to be converted into an electric signal(SOS
signal), thereby detecting the initial scanning location of one line.

[3] CRU Sensor PCB (CRU: Customer Replaceable Unit):

Comprises a CRU switch and LD switches which are turned ON and OFF by the CRU actuator assembly, the former
detecting the presence of the EPX toner cartridge and the latter, in series with the circuit emitting a laser beam,
securing the safety for a laser beam.

[4] EPX Toner Cartridge (EP: Electrical Photographics):

Comprises a drum, BCR, magnetic roll, CM blade and cleaning blade.

• Drum:

Comprises an aluminum cylinder on which an OPC (Organic Photo Conductor) sensitive material with photo­conductivity (a quality to retain the electrical charge in the darkness and move it to the earth by light) is deposited,
producing a printed image according to the potential difference (electrostatic latent image) of the surface.

• BCR (Bias Charge Roll):

Enables the drum surface to be electrically charged uniformly.

• Magnetic Roll:

Supplies toner to the drum for developing an electrostatic latent image on the drum surface.

• CM Blade (CM: Charge Metal):

Not only makes homogeneous the amount of toner on the magnetic roll surface but gives toner the electrical charge
by means of friction.

• Cleaning Blade:

Scratches off residual toner on the post-transfer drum surface, cleaning it.

– 20 –

Figure 2-8 Drive

THEORY OF OPERATION

Figure 2-9 ROS Assy

Figure 2-10 EPX Toner Cartridge

– 21 –

THEORY OF OPERATION

3-5. Electrical

[1] LVPS Assembly (LVPS: Low Voltage Power Supply):

Not only supplies AC power to the heater rod but produces and supplies stable DC power with low voltage to be used
in the logic circuit, etc.
It includes an interlock switch and a main power switch, the former being a safety switch to make or break the circuits
for AC power and DC power with a low voltage of 24 V from other than the fan power supply by depressing and
releasing the switch of the front cover assembly and the latter being the main power switch for turning ON and OFF
the power.

[2] HVPS (high voltage power supply):

Supplies voltage and current to the BCR, BTR and magnetic roll for charging, developing and transfer.

[3] MCU PCB (Main Control Unit):

Controls the whole printing operations based on information from the sensors and communication with the main logic
board.
Its main functions are as follows:

• Communication with the main logic board;

• Reception of information from the sensors and switches;

• Control of the ROS, fuser and drive assemblies;

• Control of the printing sequence;

• Distribution of low-voltage DC power from the LVPS assembly to each component.

[4] Fan:

Exhausts the system, thereby preventing internal temperature from increasing.

Figure 2-11 Electrical

– 22 –

CHAPTER 3

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.

1. Covers ......................................... 25

1-1. Rear Cover..............................25

1-2. Top Cover Assembly.............25

1-3. Left Cover and Right Cover ..26

2. Cassette Feed ............................. 27

2-1. Feeder Assembly...................27

2-2.

2-3. Feed Roll Assembly...............28

2-4. Feed Rolls...............................28

2-5. Turn Roll Assembly...............29

2-6. No Paper Actuator .................29

2-7. Feeder PCB ............................30

2-8. Size Spring .............................30

Feed Solenoid and Turn Solenoid..

27

3. Paper Transportation ................. 31

3-1. Link Assembly .......................31

3-2. Gear Double L ........................32

3-3. Gear Double R........................32

3-4. Lower Chute Assembly.........33

3-5. Take Away Roll Assembly .... 33

3-6. Front Cover Assembly ..........34

3-7. BTR Assembly .......................35

3-8. Trans. Chute Assembly.........35

3-9. Inlet Chute Assembly ............36

3-10. Regi. Sensor...........................36

3-11. Front Plate Assembly ............37

3-12. Pick Up Roll Assembly..........37

3-13. Pick Up Solenoid ...................38

3-14. MBF Sensor Assembly..........38

3-15. MBF Sensor............................39

3-16. Bottom Plate Assembly.........39

3-17. Console Assembly.................40

4. Fusing & Paper Exit ................... 41

4-1. Fuser Assembly .....................41

4-2. Pressure Roll..........................41

4-3. Exit Chute ...............................42

4-4. Exit Roll Assembly ................42

4-5.

Temperature Sensor Assembly ..

4-6. Heater Rod..............................43

4-7. Heat Roll .................................44

4-8. Exit Actuator ..........................44

4-9. Exit Sensor .............................44

43

5. Drive & Electrical........................ 45

5-1. Drive Assembly......................45

5-2. CRU Sensor PCB ...................45

5-3. CRU Actuator Assembly .......46

5-4. ROS Assembly .......................46

5-5. ESS Assembly........................47

5-6. Main Logic Board...................47

5-7. Electrical Box Cover..............48

5-8. Earth Plate Assembly ............48

5-9. MCU PCB ................................49

5-10. HVPS .......................................49

5-11. LVPS Assembly .....................50

5-12. Fan ..........................................50

REPLACEMENT AND ADJUSTMENTS OF PARTS

– 24 –

REPLACEMENT AND ADJUSTMENTS OF PARTS

1. Covers

1-1. Rear Cover

(1) Turn off the power switch and disconnect the power

cord from the wall outlet.

(2) Pressing down on the two latches [1] on the top of the

rear cover [2], open the rear cover [2].

(3) Pressing down on the two latches [3] on the bottom

of the rear cover [2], pull the rear cover [2] and
remove it.

1-2. Top Cover Assembly

(1) Open the rear cover according to the procedure

described in section 1-1.

(2) Open the front cover assembly [1].
(3) Remove the three screws [2] securing the top cover

assembly [3].

(4) Lift up the left side of the top cover assembly [3], and

remove the section [5] latching the top cover assem­bly [3] and the right cover [4].
Note:Use a mini-screwdriver or similar tool to

remove the latched section [5].

(5) Lift up the back of the top cover assembly [3], and,

with the left front side at the center, rotate the top
cover assembly approximately 15 degrees in the
counterclockwise direction.

(6)

Lift up the entire top cover assembly [3] and remove
it.
Note: When the entire top cover assembly [3] is

lifted up, the section [7] latching the left cover

[6] and top cover assembly [3] becomes

– 25 –

detached.

REPLACEMENT AND ADJUSTMENTS OF PARTS

1-3. Left Cover and Right Cover

(1) Remove the top cover assembly according to the

procedure described in section 1-2.

(2) Remove the left cover [1] by removing the latched

section [2].

(3) Remove the right cover [3] by removing the latched

section [4].
Note: When removing the latched section, use a

mini-screwdriver or similar tool.

– 26 –

REPLACEMENT AND ADJUSTMENTS OF PARTS

2. Cassette Feed

2-1. Feeder Assembly

(1) If an optional feeder unit has been installed, remove

it before proceeding to the next step.
(2) Remove the cassette.
(3) Lay the printer on its rear cover.
(4) Remove the four screws [1].
(5) With the unit still in its upright position, separate the

feeder assembly [2] from the main unit (base en-

gine). The feeder assembly [2] and main unit (base

engine) are connected by the harness assembly out

[3], so be careful not to separate the feeder assembly

[2] by too great a distance.

(6) Remove the connector (P/J 115) on the feeder PCB,

and take off the feeder assembly [2].

When the feeder assembly [2] has been removed,

there is still a chance that the surface where the

assembly was attached can be scratched by the tip of

the screw, so leave the base engine in its upright

position. Be very careful, when carrying out this

operation, not to knock over the base engine.

Caution when assembling:
When setting the base engine on the feeder assembly [2],
line up the base engine carefully, being careful of the
positioning boss on the top surface of the feeder assembly
[2], and be careful not to let the harness get caught between
the two units.

2-2. Feed Solenoid and Turn Solenoid

(1) Remove the following units:

• Cassette

• Feeder assembly (according to the procedure

described in section 2-1)

• Two screws [1]

• Feeder tie plate [2]

• Two screws [3]

• Three screws [4]

• Feed housing R [5]

• Gear in [6]

• Gear out [7]

• Feeder PCB [8] (according to the procedure

described in section 2-7)

• Connector (P/J201) [9]

• Screw [10]

• Feed solenoid [11]

• Connector (P/J202) [12]

• Screw [13]

• Turn solenoid [14]

– 27 –

REPLACEMENT AND ADJUSTMENTS OF PARTS

2-3. Feed Roll Assembly

(1) Remove the following units:

• Feed housing R, gear in, and gear out (according

• Two screws [1]

• Three screws [2]

• Feed housing L [3]

• Stop ring [4]

• Feed bearing [5]

• Feed roll assembly [6]

to the procedure described in section 2-2)

2-4. Feed Rolls

(1) Remove the following units:

• Feeder assembly (according to the procedure

described in section 2-1)

• Four feed rolls [1]
Supporting the shaft [2] of the feed roll assembly,
press on the plastic surface of the feed roll [1] and
remove the feed roll [1] from the shaft [2] of the
feed roll assembly.

Caution when assembling:
Line up the feed roll [1] with the positioning hole in the
shaft [2] of the feed roll assembly.

– 28 –

REPLACEMENT AND ADJUSTMENTS OF PARTS

2-5. Turn Roll Assembly

(1) Remove the following units:

• Feed housing R, gear in, and gear out (according
to the procedure described in section 2-2)

• Stop ring [1]

• Feed bearing [2]

• Turn roll assembly [3]

2-6. No Paper Actuator

(1) Remove the following units:

• Feed housing R, gear in, and gear out (according
to the procedure described in section 2-2)

• No paper actuator [1]
Bend the no paper actuator [1] and force it past the
projection [2] on the feeder frame assembly.
Remove the no paper actuator [1] with the detect­ing section [3] in the upward position.

– 29 –

REPLACEMENT AND ADJUSTMENTS OF PARTS

2-7. Feeder PCB

(1) Remove the following units:

• Cassette

• Feed housing R, gear in, and gear out (according

• Two screws [1]

• Three connectors (P/J116, P/J201, P/J202) [2]

• Feeder PCB [3]

to the procedure described in section 2-2)

2-8. Size Spring

(1) Remove the following units:

• Feeder PCB (according to the procedure described
in section 2-7)

• Screw [1]

• Size spring [2]

– 30 –

REPLACEMENT AND ADJUSTMENTS OF PARTS

3. Paper Transportation

3-1. Link Assembly

(1) Remove the following units:

• Left cover (according to the procedure described
in section 1-3)

• Two screws [1]

• Link assembly [2] from the ROS assembly [3]

Close the front cover assembly [4] somewhat, and
remove the link assembly [2] from the ROS
assembly [3].
The link assembly [2] remains attached to the
front cover assembly [4] even after the link as­sembly [2] has been removed from the ROS
assembly [3], so be careful not to damage it.

(2) Expand the link spring [5], then remove the link

assembly [2].

– 31 –

REPLACEMENT AND ADJUSTMENTS OF PARTS

3-2. Gear Double L

(1) Open the front cover assembly [1].
(2) Remove the following units:

• C ring [2]

• Gear double L [3]

Caution when assembling:
Open the front cover assembly [1] all the way, and bring the
lower chute assembly [4] forward. With the left end of the
lower chute assembly [4] pressed against the inlet chute
assembly and pick up roll assembly, match up the position­ing boss [5] on the gear double L [3] with the horizontal part
of the ROS assembly [6], and attach the gear double L [3].

Pressing the left end of the lower chute assembly
[4] onto the inlet chute assembly and pick up roll
assembly, remove the gear double L [3].

3-3. Gear Double R

(1) Open the front cover assembly [1].
(2) Remove the following units:

• C ring [2]

• Gear double R [3]

With the right end of the lower chute assembly [4]
pressed against the inlet chute assembly and pick
up roll assembly, remove the gear double R [3].

Caution when assembling:
Open the front cover assembly [1] all the way, and bring the
lower chute assembly [4] forward. With the right end of the
lower chute assembly [4] pressed against the inlet chute
assembly and pick up roll assembly, match up the position­ing boss [5] on the gear double R [3] with the horizontal part
of the ROS assembly [6], and attach the gear double R [3].

– 32 –

REPLACEMENT AND ADJUSTMENTS OF PARTS

3-4. Lower Chute Assembly

(1) Remove the following units:

• Gear double L (according to the procedure
described in section 3-2)

• Gear double R (according to the procedure
described in section 3-3)

(2) Lower the lower chute assembly [1] towards the back

of the unit, and, pressing the bottom plate assembly

[2] against the cam [4] of the pick up roll assembly
[3], rotate the pick up roll assembly [3] until the

bottom plate assembly [2] is at the position closest to
the front of the unit.

(3) Remove the spring [6] from the screw [5]. The spring

[6] is hooked onto the screw [5] that projects from
bottom plate assembly [2].

(4) Remove the following units:

• Two stop rings [7]

• Lower chute assembly [1]

Slide the left pivot shaft [8] 25 mm to the left, and
the right pivot shaft [9] 25 mm to the right to
remove the lower chute assembly [1].

Caution when disassembling:
Do not remove the two pivot shafts [8] and [9] from the gear
front cover and front cover assembly [10].

Caution when assembling:
Attach the stop ring [7] on the left pivot shaft [8] to the
groove on the inner side, and the stop ring [7] of the right
pivot shaft [9] to the groove on the outer side.

3-5. Take Away Roll Assembly

(1) Open the front cover assembly [1].
(2) Remove the take away roll assembly [2] from the

lower chute [3].

Caution when assembling:

• Line up the positioning boss [4] of the take away roll
assembly [2] with the groove [5] for positioning the
lower chute [3], and install the take away roll assembly
[2].

• Be careful not to let the mylar on the lower chute [3] get
caught up in the other parts. When the front cover
assembly [1] is open, the mylar should be attached on
the underside of the take away roll assembly [2].

– 33 –

REPLACEMENT AND ADJUSTMENTS OF PARTS

3-6. Front Cover Assembly

(1) Remove the following units:

• Electrical box cover (according to the procedure

• Three connectors (P/J16, P/J17) of the MCU PCB

• Three connectors (P/J TR, P/J RTN, P/J PTN) of

• Screw securing the wire assembly front and the

• Gear double L (according to the procedure

• Gear double R (according to the procedure

(2) Lower the lower chute assembly [1] towards the back

of the unit, and, pressing the bottom plate assembly

[2] against the cam [4] of the pick up roll assembly
[3], rotate the pick up roll assembly [3] until the

bottom plate assembly [2] is at the position closest to
the front of the unit.

(3) Remove the spring [6] from the screw [5]. The spring

[6] is hooked onto the screw [5] that projects from
bottom plate assembly [2].

(4) Remove the following units:

• Two stop rings [7] [8]

• Link assembly [9] (according to the procedure

• Two screws [10]

• Earth plate assembly [11]

• Cable cap [12]

• Front cover assembly [13]

described in section 5-7)

(according to the procedure described in section
5-9)

the HVPS (according to the procedure described
in section 5-10)

ground wire to the LVPS assembly

described in section 3-2)

described in section 3-3)

described in section 3-1)

Slide the left pivot shaft [14] to the left and pull it
off, and the right pivot shaft [15] to the right and

pull it off. Then remove the front cover assembly
[13].

Caution when disassembling:
Because the lower chute assembly [1] and the two gear front
covers [16] are also removed at the same time, be careful not
to damage or misplace any of the parts.
Slide the left and right pivot shafts [14] [15]little by little,
removing first the lower chute assembly [1], next the gear
front covers [16], and finally the front cover assembly [13],
to make the operation as easy as possible.

– 34 –

Caution when assembling:
Make sure the harness is wired to the inner side of the earth
plate assembly [11], so that it doesn’t interfere with the
movement of the link assembly [9].
When attaching the stop rings to the pivot shaft, attach the
left stop ring [7] to the groove in the leftmost end (inner
side) of the left pivot shaft [14], and the right stop ring [8]
to the groove in the leftmost end (outer side) of the right
pivot shaft [15].

REPLACEMENT AND ADJUSTMENTS OF PARTS

3-7. BTR Assembly

(1) Open the front cover [1].
(2) Pull the BTR assembly [2] off the trans. chute

assembly [3], and remove it.

Caution when disassembling:
Be careful not to touch the BTR surface of the BTR
assembly [2], or the eliminator of the trans. chute assembly
[3]. While restraining the trans. chute assembly [3], pull out
the BTR assembly [2].
After the BTR assembly [2] has been drawn out, wrap it
carefully in paper to keep it from becoming dirty or
damaged, and store it in a safe place.

Assembly:
(1) Remove the trans. chute assembly [3] according to

the procedure described in section 3-8.

(2) Line up the bearing [4] of the trans. chute assembly

[3] with the shaft of the BTR assembly [2]. Install the
BTR assembly [2] so that its gear is on the left side.

(3) Restraining the left end of the BTR assembly [2]

shaft, press the right end into position, and attach the
BTR assembly [2] to the bearing [4] of the trans.
chute assembly [3].

(4) Fit the tip of the mini-screwdriver under the bearing

[4] of the left trans. chute assembly [3], and, while
pressing on the left end of the BTR assembly [2]
shaft, attach the BTR assembly [2] to the bearing [4]
of the left trans. chute assembly [3].

(5) Install the trans. chute assembly [3] according to the

procedure described in section 3-8.

3-8. Trans. Chute Assembly

(1) Open the front cover assembly [1].
(2) Remove the following units:

• BTR assembly [2] (according to the procedure

described in section 3-7)

• Two screws [3]

• Trans. chute assembly [4]

Hold down the front cover while removing the
trans. chute assembly.

• Connector (P/J TR-T)

• Screw securing the wire assembly eliminator

Caution when assembling:
After attaching the BTR assembly [2], reverse the assembly
procedure to disassemble it.

– 35 –

REPLACEMENT AND ADJUSTMENTS OF PARTS

3-9. Inlet Chute Assembly

(1) Open the front cover assembly [1].
(2) Remove the following units:

• Inlet chute assembly [2]

• Connector (P/J120) [3]

• Screw [4]

Pressing down on the pick up roll assembly [5],
remove the inlet chute assembly [2], being careful
not to touch the BTR surface of the BTR assembly
[6].

Caution when assembling:
Line up the positioning boss [7] of the pick up roll assembly
[5] with the positioning groove [8] of the inlet chute
assembly [2], and attach the inlet chute assembly [2].
Make sure the inlet chute assembly [2] is positioned in front
of the inlet spring, and, being careful not to let the mylar of
the lower chute assembly get caught between the other
parts, attach the inlet chute assembly [2] so that the mylar
is positioned upwards of the inlet chute assembly [2] when
the front cover assembly [1] is open.

3-10. Regi. Sensor

(1) Open the front cover assembly.
(2) Remove the following units:

• Inlet chute assembly [1] (according to the proce-

dure described in section 3-9)

• Regi. sensor [2]

– 36 –

REPLACEMENT AND ADJUSTMENTS OF PARTS

3-11. Front Plate Assembly

(1) Remove the following units:

• Trans. chute assembly (according to the proce-

dure described in section 3-8)

• Inlet chute assembly (according to the procedure

described in section 3-9)

• Six screws [1]

• Front plate assembly [2]

3-12. Pick Up Roll Assembly

(1) Remove the following units:

• Inlet chute assembly (according to the procedure

described in section 3-9)

• Two screws [1]

• Pick up roll assembly [2]

– 37 –

REPLACEMENT AND ADJUSTMENTS OF PARTS

3-13. Pick Up Solenoid

(1) Remove the following units:

• Electrical box cover (according to the procedure

• Connector (P/J17) on the MCU PCB

• Trans. chute assembly (according to the proce-

• Inlet chute assembly (according to the procedure

• Front plate assembly (according to the procedure

• Pick up roll assembly (according to the procedure

• Connector (P/J 301)

• Screw [2]

• Pick up solenoid [3]

Caution when disassembling:
Confirm the routing of the harness before removing the
pick up solenoid [3].

described in section 5-7)

dure described in section 3-8)

described in section 3-9)

described in section 3-11)

described in section 3-12)

3-14. MBF Sensor Assembly

(1) Remove the following units:

• Pick up roll assembly (according to the procedure

described in section 3-12)

• MBF spring [1]

• Two screws [2]

• Connector (P/J121) [3]

• MBF sensor assembly [4]

Caution when assembling:
Be careful of the attachment position for the MBF spring

[1].

– 38 –

REPLACEMENT AND ADJUSTMENTS OF PARTS

3-15. MBF Sensor

(1) Remove the following units:

• Pick up roll assembly (according to the procedure

described in section 3-12)

• MBF spring [1]

• Two screws [2]

• Connector (P/J121) [3]

• MBF sensor [4]

3-16. Bottom Plate Assembly

(1) Remove the following units:

• Pick up roll assembly (according to the procedure

described in section 3-12)

(2) Remove the spring [1] from the screw [2]. The spring

[1] is hooked onto the screw [2] that projects from the
bottom plate assembly [3].

(3) Remove the bottom plate assembly [3].

Caution when assembling:
Insert the MBF actuator [4] in the notch [5] in the bottom
plate assembly [3], and attach the bottom plate assembly

[3].

– 39 –

REPLACEMENT AND ADJUSTMENTS OF PARTS

3-17. Console Assembly (1) Remove the following units:

• Front plate assembly (according to the procedure

• Four screws [1]

• Console assembly [2]

• Connector (P/J200) [3]

described in section 3-11)

– 40 –

REPLACEMENT AND ADJUSTMENTS OF PARTS

4. Fusing & Paper Exit

4-1. Fuser Assembly

(1) Remove the following units:

• Left cover and right cover (according to the

procedure described in section 1-3)

• Three screws [1]

• Fuser assembly [2]

Note: The connector (P/J101) will come off when

the fuser assembly [2] is lifted up.

Caution when assembling:
When tightening the screw [1] that secures the fuser
assembly [2], make sure the drive assembly gear [3] and the
gear exit [4] fit together properly.

4-2. Pressure Roll

(1) Open the rear cover.
(2) Remove the following units:

• Fuser assembly (according to the procedure

described in section 4-1)

• Two screws [1]

• Fuser cover assembly [2]

• P/R ground spring [3]

• P/R eliminator [4]

• Pressure roll [5]

Lift up the two NIP levers [6] to remove them.

Caution when disassembling:
When the NIP levers [6] are lifted up, two P/R bearings [7]
and NIP springs [8] come off at the same time, so be careful
not to lose them.

– 41 –

REPLACEMENT AND ADJUSTMENTS OF PARTS

4-3. Exit Chute

(1) Remove the following units:

• Pressure roll (according to the procedure

• Two screws [1]

• Two exit springs [2]

• Exit chute [3]

Caution when assembling:
When removing the exit chute [3], be careful not to scratch
the heat roller [4].

Caution when disassembling:
Insert the exit actuator [6] in the notch of the exit chute [3],
and attach the exit chute [3].

described in section 4-2)

4-4. Exit Roll Assembly

(1) Remove the following units:

• Exit chute (according to the procedure described

in section 4-3)

• Two stop rings [1]

• Gear exit [2]

• Exit roll assembly [3]

– 42 –

REPLACEMENT AND ADJUSTMENTS OF PARTS

4-5. Temperature Sensor Assembly

(1) Remove the following units:

• Exit chute (according to the procedure described

in section 4-3)

• Screw [1]

• Two screws [2]

• Three screws [3]

• Ground plate [4]

• Temperature sensor assembly [5]

Caution when disassembling:
When removing temperature sensor assembly [5], be care­ful not to scratch the heat roller [6].

Caution when assembling:
Attach the temperature sensor assembly [5] so that its
thermistor is positioned underneath the heat roller [6].
Connect harnesses [7], [8], and [9] coming from the con­nector (J101) of the temperature sensor assembly [5] to the
positions shown in the diagram.

J101-5PIN [7]
J101-2PIN (100/115 VAC) [8]
J101-3PIN (220/240 VAC) [8]
J101-6PIN [9]

4-6. Heater Rod

(1) Remove the following units:

• Pressure roll (according to the procedure

described in section 4-2)

• Two screws [1]

• Screw [2]

• Fuser frame R [3]

Caution when disassembling:
Support the heater rod [4] when removing the
fuser frame R [3].

• Idler shaft [5]

• Gear idler [6]

• Screw [7]

• Heater rod [4]

– 43 –

REPLACEMENT AND ADJUSTMENTS OF PARTS

4-7. Heat Roll

(1) Remove the following units:

• Exit chute (according to the procedure described

• Two screws [1]

• Fuser inlet chute [2]

• Heater rod (according to the procedure described

• H/R ring [3]

• Gear H/R [4]

• H/R bearing R[5]

• Screw [6]

• Ground plate [7]

• H/R ring [8]

• H/R bearing L [9]

• Heat roll [10]

4-8. Exit Actuator

(1) Remove the following units:

• Heat roll (according to the procedure described in

• Exit actuator [1]

• Exit torsion spring [2]

in section 4-3)

in section 4-6)

section 4-7)

4-9. Exit Sensor

(1) Remove the following units:

• Fuser assembly (according to the procedure

described in section 4-1)

• Connector (P/J119) [1]

• Exit sensor [2]

– 44 –

REPLACEMENT AND ADJUSTMENTS OF PARTS

5. Drive & Electrical

5-1. Drive Assembly

(1) Remove the following units:

• Fuser assembly (according to the procedure

described in section 4-1)

• ESS assembly (according to the procedure

described in section 5-5)

• Electrical box cover (according to the procedure

described in section 5-7)

• Connector (P/J14) [1]

• Screw [2]

• Three screws [3]

• Drive assembly [4]

Caution when assembling:
Be careful that the drive assembly harness doesn’t get
caught in other parts.

5-2. CRU Sensor PCB

(1) Remove the following units:

• Fuser assembly (according to the procedure

described in section 4-1)

• ESS assembly (according to the procedure

described in section 5-5)

• Electrical box cover (according to the procedure

described in section 5-7)

• Connector (P/J118) [1]

• CRU sensor cover [2]

• Screw [3]

• CRU sensor PCB [4]

– 45 –

REPLACEMENT AND ADJUSTMENTS OF PARTS

5-3. CRU Actuator Assembly

(1) Remove the following units:

•

• CRU actuator assembly [3]

• CRU actuator spring [4]

5-4. ROS Assembly

(1) Remove the following units:

• Electrical box cover (according to the procedure

•

• Six connectors (P/J111, P/J CR, P/J DB, P/J TR,

• Screw securing the wire assembly front and the

• Gear double L (according to the procedure

• Gear double R (according to the procedure

• Earth plate assembly (according to the procedure

• Cable cap (according to the procedure described

• Front cover assembly (according to the procedure

• Electrical box base with MCU PCB (according to

• HVPS (according to the procedure described in

• LVPS (according to the procedure described in

• Drive assembly (according to the procedure

• CRU actuator assembly (according to the proce-

• Six screws [1]

• Front earth spring [2]

• Connector (P/J112) [3] and connector (P/J114) [4]

• Connector (P/J113) [5]

• ROS assembly [6]

– 46 –

Screw [1] and CRU sensor PCB [2] (according to
the procedure described in section 5-2)

described in section 5-7)
Ten connectors (P/J11 to P/J19) of the MCU PCB
(according to the procedure described in section
5-9)

P/J RTN, P/J PTN) of the HVPS (according to the
procedure described in section 5-10)

ground wire to the LVPS assembly

described in section 3-2)

described in section 3-3)

described in section 5-8)

in section 3-6)

described in section 3-6)

the procedure described in section 5-11)

section 5-10)

section 5-11)

described in section 5-1)

dure described in section 5-3)

REPLACEMENT AND ADJUSTMENTS OF PARTS

5-5. ESS Assembly

(1) Remove the following units:

• Left cover and right cover (according to the

procedure described in section 1-3)

• Connector (P/J5) [1] of the main logic board

• Ten screws [2]

• ESS assembly [3]

Note: When the ESS assembly [3] is lifted up, the

connector (P31) comes off.

5-6. Main Logic Board

(1) Remove the following units:

• ESS assembly (according to the procedure

described in section 5-5)

• Two connector covers [1]

• Connector cover

• Blind plate

• Three screws [2]

• Extra rear panel [3]

• RAM board (if installed)

• ROM board MS (if installed)

• Four screws [4]

• Two screws [5]

• ESS rear panel [6]

• Five screws [7]

• Main logic board [8]

• Transit BD RAM unit [9]

• Transit BD PDL unit [10] (for LS-5EX and LS-

5TT)

1b

(for LS-5EX and LS-5TT)

1a

(for LS-5)

– 47 –

REPLACEMENT AND ADJUSTMENTS OF PARTS

5-7. Electrical Box Cover

(1) Remove the following units:

• Fuser assembly (according to the procedure

• ESS assembly (according to the procedure

• Connector (P/J119) [1]

• Exit sensor [2]

• Two screws [3]

• Five screws [4]

• Six screws [5]

• Electrical box cover [6]

• Bush [7]

described in section 4-1)

described in section 5-5)

5-8. Earth Plate Assembly

(1) Remove the following units:

• Electrical box cover (according to the procedure

described in section 5-7)

• Two connectors (P/J CR, P/J DB) [1]

• Link assembly [2] (according to the procedure

described in section 3-1)

• Two screws [3]

• Earth plate assembly [4]

Caution when assembling:
Wire the harness on the inner side of the earth plate
assembly [4], and make sure it doesn’t interfere with the
movement of the link assembly [2].

– 48 –

REPLACEMENT AND ADJUSTMENTS OF PARTS

5-9. MCU PCB

(1) Remove the following units:

• Electrical box cover (according to the procedure

described in section 5-7)

• Ten connectors (P/J11 to P/J19) of the MCU PCB

• Four screws [1]

• MCU PCB [2]

5-10. HVPS

(1) Remove the following units:

• Electrical box cover (according to the procedure

described in section 5-7)

• Six connectors (P/J111, P/J CR, P/J DB, P/J TR,

P/J RTN, P/J PTN) of the HVPS

• Five screws [1]

• HVPS [2]

– 49 –

REPLACEMENT AND ADJUSTMENTS OF PARTS

5-11. LVPS Assembly

(1) Remove the following units:

• Earth plate assembly (according to the procedure

•

• Two screws [2]

• Screw [3]

• MCU PCB [1] and electrical box base [4]

• Screw [5]

• Screw [6]

• Two screws [7]

• Two screws [8]

• LVPS assembly [9]

• Saddle edge H [10]

Caution when assembling:
Make sure the harness doesn’t interfere with the movement
of the link assembly.

described in section 5-8)
Ten connectors (P/J11 to P/J19) of the MCU PCB [1]

5-12. Fan

(1) Remove the following units:

• Electrical box cover (according to the procedure

described in section 5-7)

• Connector (P/J18) [1]

• Two screws [2]

• Fan [3]

Caution when assembling:
Attach the fan so it faces the direction in which air will be
discharged from the interior of the equipment.

– 50 –

CHAPTER 4

MAINTENANCE GUIDE

1. Preventive Maintenance .....................................................................................53

1-1. Preventive Maintenance....................................................................................... 53

1-2. Consumables ........................................................................................................ 53

1-3. Parts Replacement Schedule .............................................................................. 53

2. Test Print Mode ...................................................................................................54

2-1. Functions............................................................................................................... 54

2-2. Test Print Operating Method ............................................................................... 54

3. Control..................................................................................................................55

3-1. Error Massages..................................................................................................... 55

3-2. ROS Control .......................................................................................................... 56

3-2-1. Scanner Motor Rotation............................................................................... 56

3-2-2. Warming up of ROS...................................................................................... 56

3-2-3. ROS Standard Value..................................................................................... 56

3-3. Fuser Control ........................................................................................................ 57

3-3-1. Fuser Control Method .................................................................................. 57

3-3-2. ON/OFF Control of the Heater Rod ............................................................. 57

3-3-3. Fuser Warming up ........................................................................................ 57

3-3-4. List of Fuser Temperatures ......................................................................... 57

3-4. Erase Cycle ........................................................................................................... 57

3-5. Cleaning Cycle ...................................................................................................... 58

3-6. Paper Jam Detection ............................................................................................ 58

4. Connector P(Plug)/J(Jack) Arrangement ..........................................................60

4-1. P/J Layout Drawing .............................................................................................. 60

4-2. P/J List................................................................................................................... 62

5. Connection Wiring Diagram ...............................................................................63

4

5-1. General Connection Wiring Diagram .................................................................. 63

5-2. Connection Wiring Drawing between Parts ....................................................... 64

5-2-1. LVPS Assy ↔ MCU PCB.............................................................................. 66

5-2-2. LVPS Assy ↔ Fuser Assy ........................................................................... 67

5-2-3. MCU PCB ↔ ROS Assy ............................................................................... 68

5-2-4. MCU PCB ↔ Feeder PCB ↔ Feeder PCB aux ↔ Feed Solenoid, Turn

Solenoid ........................................................................................................ 69

5-2-5. MCU PCB ↔ Drive Assy .............................................................................. 71

5-2-6. MCU PCB ↔ HVPS ↔ Earth Plate Assy, Trans. Chute Assy, Inlet Chute

Assy ↔ BTR Assy: MCU PCB ↔ CRU Sensor PCB ................................. 72

5-2-7. MCU PCB ↔ Exit Sensor, Regi. Sensor, MBF Sensor .............................. 74

5-2-8. MCU PCB ↔ Pick Up Solenoid, Fan ........................................................... 75

5-2-9. Main Logic Board ↔ Console Assy ........................................................... 76

5-2-10. LVPS Assy ↔ Main Logic Board ↔ MCU PCB ......................................... 77

5-2-11. ROM Board MS ↔ Transit BD PDL ↔ Main Logic Board ↔ Transit BD

RAM ↔ RAM Board...................................................................................... 78

MAINTENANCE GUIDE

– 52 –

1. Preventive Maintenance

1-1. Preventive Maintenance

Operations to prevent failure are performed during service.
Preventive Maintenance Procedure:
(1) Check for the operating status of the printer.
(2) Record the accumulated number of printed sheets.

Note: Use the number as a standard for replacing recommended renewal parts.

The accumulated number of printed sheets can be obtained by “Page count” printed in “Status and Setup

Report” by operating the control panel.
(3) Print several sheets to ensure normal operation.
(4) Remove the trans. chute assy and clean the eliminator with a brush, etc..

MAINTENANCE GUIDE

(5) Clean the paper transport path and rolls for transporting paper with a brush and dry waste.

Note: When the parts are considerably dirty, clean with a wet cloth (waste) and then with a dry cloth (waste).

Do not touch the BTR surface of the BTR assembly.
(6) Cleaning the air exit of the fan.

Remove the right cover and brush off dust on the air exit areas of the fan and the right cover.
Note: Clogging in the air exits may result in temperature rise in the printer, causing failure.

(7) Reprint several sheets to ensure normal operation.

1-2. Consumables

Consumables are to be replaced by customers, while they may be replaced to fix the failure caused by consumables or
to locate the cause of failure.

• EPX toner cartridge:
Its life standard is printing approx. 8000 sheets of paper of A4 size at an image coverage of 2.8%.
Note: Even with A4 size paper and an image coverage of 2.8%, the number of paper to print, a standard of the life of the

EPX toner cartridge, may vary according to the sensitivity of the drum itself and image contents.
Do not remove the EPX toner cartridge from its packaging until you are ready to use it. The shelf life of an unopened
cartridge package is 2 years of storage plus usage in the normal condition.

1-3. Parts Replacement Schedule

It is recommended that recommended renewal parts be replaced for each predetermined number of sheets to print for
failure preventive purposes.
Fuser assy (number of sheets to print for recommended renewal of parts: 100,000)

– 53 –

MAINTENANCE GUIDE

2. Test Print Mode

2-1. Functions

This mode enables the printer built-in test print (self-pattern print) to print at maximum speed.
Printing in the test print mode makes it possible to identify whether it is caused by the main logic board or by the engine
when a failure occurs.

• Printing in the test print mode is normal → A defect exists in the main logic board.

• Printing in the test print mode is also abnormal → A defect exists in the engine.

Test print self-patterns are as follows:

Paper transport

Approx.4mm

Approx.4mm Approx.4mm

128dot

1dot

Approx.4mm

128dot

(Paper)

1dot

1dot

1dot

1dot

A 1-dot black line is printed for each 128 dots.

The areas where the broken lines pass (blocks at
the right end and bottom of the paper) are not
necessarily square.

1dot

2-2. Test Print Operating Method

(1) Open the rear cover according to the procedure described in section 1-1 of chapter 3.
(2) Turn ON the power switch.
(3) When the printer enters the standby state, insert a mini-screwdriver into the elec. box cover hole to short the two

pins of the J32 on the main logic board.

(4) Shorting these two pins causes test print to start.

– 54 –

3. Control

3-1. Error Massages

MAINTENANCE GUIDE

LCD Display

PRINTER ERROR
CALL SERVICE 01

PRINTER ERROR
CALL SERVICE 03

PRINTER ERROR
CALL SERVICE 04

PRINTER ERROR
CALL SERVICE 05

PRINTER ERROR
CALL SERVICE 06

PRINTER ERROR
CALL SERVICE 07

PRINTER ERROR
CALL SERVICE 08

PRINTER ERROR
CALL SERVICE 10

PRINTER ERROR
CALL SERVICE 11

Meaning

Fuser assy malfunction

Scanner motor malfunction

Improper communication

Cyclic Redundancy Check error in main ROM program

Cyclic Redundancy Check error in resident font ROM

Read/Write test error in on-board RAM

Read/Write test error in expansion RAM

Cyclic Redundancy Check error in EEPROM

Read/Write test error in EEPROM

PRINTER ERROR
CALL SERVICE 20

PRINTER ERROR
CASS: REFILL ???

PRINTER ERROR
LCAS: REFILL ???

PRINTER ERROR
TRAY: REFILL ???

PRINTER ERROR
LOAD ??? CASS.

PRINTER ERROR
LOAD ??? LCAS.

PRINTER ERROR
CASS: CHANGE ???

PRINTER ERROR
LCAS: CHANGE ???

PRINTER ERROR
TRAY: CHANGE ???

PRINTER ERROR
CLOSE COVER

NVM error

Cassette is current feeder; No paper in cassette (???: Page size)

Lower cassette is current feeder; No paper in lower cassette (???: Page size)

Front tray (multi-purpose tray) is current feeder; No paper in front tray
(???: Page size)

Cassette is current feeder; No cassette in cassette slot (???: Page size)

Lower cassette is current feeder; No cassette in lower cassette slot (???: Page size)

The size of paper set in cassette does not match one set in the control panel, etc.
(???: Page size)

The size of paper set in the lower cassettes does not match one set in the control panel, etc.
(???: Page size)

The size of paper set in the front tray (multi-purpose tray) does not match one set in the
control panel, etc. (???: Page size)

Front cover open

– 55 –

MAINTENANCE GUIDE

LCD Display

PRINTER ERROR
PAPER JAMMING

PRINTER ERROR
SET EP CARTRIDGE

Paper jamming

No EPX toner cartridge

Meaning

3-2. ROS Control

3-2-1. Scanner Motor Rotation

ON/OFF control of rotation of the scanner motor can be performed as follows according to each operating mode:

Operating mode ON/OFF control of scanner motor rotation

On-line mode Control by main logic board

Test print mode On turning on power, rotation starts, constantly remaining in the ON state.

Revolutions of the scanning motor corresponding to resolutions are as follows:

Resolution Revolution

300dpi 6614RPM

dpi (dot per inch: the number of dots per inch)
RPM (revolutions per minute)

3-2-2. Warming up of ROS

On starting warming up of the ROS, the scanner motor rotates, the interval of SOS signals becomes shorter than the
READY standard value three times in succession, leading to the termination of the ROS warming up (the scanner motor
is rotating at constant speed).

3-2-3. ROS Standard Value

ROS standard value Contents

READY standard value Interval of SOS signals corresponding to over 98% of the specified revolution of the

scanner motor

FAIL standard value Interval of SOS signals corresponding to below 90% of the specified revolution of the

scanner motor

Reference: Runaway of the scanner motor including a speed increase of over 1% prevents a laser beam from entering into

the SOS sensor. When FAIL standard value is not obtained, an error message of “CALL SERVICE 03” is
displayed.

– 56 –

MAINTENANCE GUIDE

3-3. Fuser Control

3-3-1. Fuser Control Method

ON/OFF control of the heater rod is performed based on fuser control temperature.
While the ROS is warming up and the main motor is being stopped, use the standby temperature for the fuser control
temperature. When the main motor is running except for warming up time (e.g., during print operation and erase cycle),
use the the running temperature for the fuser control temperature.

3-3-2. ON/OFF Control of the Heater Rod

ON/OFF control of the heater rod is performed based on the following rules:

• With fuser control temperature of below approx. -2°C (fuser ON temperature), the heater rod goes ON.

• With fuser control temperature of above ±0 °C (fuser OFF temperature), the heater rod goes OFF.

3-3-3. Fuser Warming up

On starting warming up of the fuser, the heater rod lights, and when the temperature of the heat roll surface (detection
temperature of the temp. sensor assy’s thermistor) reaches the fuser control temperature (standby temperature), the fuser
has finished warming up. The main motor operates during warming up of the fuser.

3-3-4. List of Fuser Temperatures

Temperature

High trouble temperature Approx. 185°C (standby temperature + approx. 35°C)
Fuser OFF temperature Fuser control temperature ±0 °C

Fuser control temperature

Fuser ON temperature Fuser control temperature –2 °C
Low trouble temperature Approx. 125°C

Standby temperature: 150°C (nominal)
Running temperature: 160°C (nominal)

3-4. Erase Cycle

When the print operation is interrupted due to the OFF of the interlock switch, paper jam, removal of a paper cassette or
power OFF, an erase cycle is performed in the first recovery (when the interlock switch is ON, a paper cassette is mounted,
and power is ON). In an erase cycle, the main motor operates to output CR (DC) and TR(–) of the HVPS.
Note 1: An erase cycle stops by turning the interlock switch OFF, removing the paper cassette and activating the exit

sensor. An erase cycle resumes by turning the interlock switch on, mounting a paper cassette and turning power
ON.

Note 2: An erase cycle is not performed when the regi. sensor or exit sensor is actuated during recovery (when the

interlock switch is ON, a paper cassette is mounted, and power is ON).

– 57 –

MAINTENANCE GUIDE

3-5. Cleaning Cycle

A cleaning cycle is performed with power and the CRU switch ON and when printing is completed (except for during
continuous printing).
Cleaning cycles include the following two types:

• Warm up cleaning (when power and the CRU switch are ON)

• Cycle out cleaning (when printing is completed)

In a cleaning cycle, the main motor operates and each output of the HVPS is output in constant timing.
Note 1: A cleaning cycle stops by turning the interlock switch OFF, removing the paper cassette and actuating the exit

sensor. A cleaning cycle resumes by turning the interlock switch ON, mounting a paper cassette, and turning

power ON.
Note 2: Warm up cleaning is performed only in the on-line mode.
Note 3: Completion of both warm up cleaning and fuser warm up causes warm up of the printer to complete.

3-6. Paper Jam Detection

To detect presence of the paper and whether or not the paper has been normally fed, the following paper sensors are
provided:

• Regi. Sensor

• Exit Sensor

The MCU PCB determines whether paper is jammed by checking whether paper is present or absent at the sensor at times
stored in the memory. If it detects a jam, the MCU PCB immediately stops printing, and send a signal to the main logic
board to notify the jam. The main logic board command the control panel to display the error message “PAPER
JAMMING”

The MCU PCB detects a jam in any of the following conditions:

• Inlet chute haste jam

After the feed solenoid or the pick up solenoid is ON, the paper reach the regi. sensor within the required time (E2-

1).

• Inlet chute delay jam

After the feed solenoid or the pick up solenoid is ON, the paper does not reach the regi. sensor within the required time
(E2-2).

• Exit roll delay jam

After the regi. sensor detects the leading edge of the paper, the paper does not reach the exit sensor within the required
time (E3).

• Exit roll stationary jam

After the regi. sensor detects the leading edge of the paper, the paper does not clear the exit sensor within the required
time (E4).

• Remaining jam

After power is switch ON, and the printer delivers automatically to the tray, the paper remains at the each paper sensor.

– 58 –

MAINTENANCE GUIDE

Feed Solenoid
Pick Up Solenoid

Regi. Sensor

Exit Sensor

ON

Jam

E2-1

E2-2

E3

Jam

E4

Jam

Jam

(Unit : Sec.)

Required Time E2-1 E2-2 E3 E4

Tray (A) (B) (A) (B) (A) (B) (A) (B)
Tray 1 (Upper cassette) 3.30 3.60 4.30
Tray 2 (Lower cassette) 5.66 5.96 6.60 6.92 17.96 22.78
Multi-Purpose tray 0.93 1.63

Note: Paper Size (A) : Except for Legal size

(B) : Legal size

– 59 –

MAINTENANCE GUIDE

4. Connector P(Plug)/J(Jack) Arrangement

4-1. P/J Layout Drawing (1/2)

ABCDEFGHI JKL

1

2

3

4

5

10

11

12

6

7

8

9

13

14

15

– 60 –

4-1. P/J Layout Drawing (2/2)

ABCDEFGHI JKL

16

17

18

19

20

MAINTENANCE GUIDE

21

22

23

24

25

26

27

28

29

30

– 61 –

MAINTENANCE GUIDE

4-2. P/J List

Coordinates of connectors corresponding to “4-1. P/J Layout Drawing” are shown below.

P/J Remark

213•For use in thermistor of temp.

11 G5 • P/J on MCU PCB
12 E6 • P/J on MCU PCB
13 E6 • P/J on MCU PCB
14 E5 • P/J on MCU PCB
15 F5 • P/J on MCU PCB
16 F5 • P/J on MCU PCB
17 F5 • P/J on MCU PCB
18 E5 • P/J on MCU PCB
19 G5 • P/J on MCU PCB
21 F5 • P/J on MCU PCB

31 G6

32 E6

51 I4 • For use in power supply for

101 I3

111 F5 • P/J on HVPS

112 F14

Coordi-

nates

• P/J in LVPS assy

sensor assy

• Connection between MCU

PCB and main logic board

• P(plug) on MCU PCB

• For test print use

• P/J on main logic board

main logic board

• Connection between LVPS

assy and fuser assy

• P/J of the rear side of ROS

assy

P/J Remark

113 H12

114 F13 • P/J of ROS assy bottom

115

116 E28 • P/J on feeder PCB
118 H3 • P/J on CRU sensor PCB
119 G3 • P/J of exit sensor
120 F20 • P/J of regi. sensor
121 G20 • P/J of MBF sensor

201

202

301 E19

CR G4 • P/J on feeder HVPS
DB E4 • P/J on feeder HVPS
TR F4 • P/J on feeder HVPS

RTN E5 • A pair of P/J on HVPS

TR-T H19

Coordi-

nates

• P/J of the left side of ROS

assy

E27

E28

F28 • P/J on feeder PCB
F29 • P/J on feeder PCB AUX

F28 • P/J on feeder PCB
F29 • P/J on feeder PCB AUX

• Connection between main-

frame and feeder assy

• Connection between feeder

assy and optional feeder unit

• Connection between MCU

PCB and pick up solenoid

• P/J on the back of trans. chute

assy

Note 1: While P/J2 is in LVPS assy, silk print on LVPS assy board is indicated as “P12.”
Note 2: P/J115, P/J201 and P/J202 are in both tray 1 (upper feed unit) and tray 2 (lower feeder unit: optional).
Note 3: Descriptions of P/J Layout Drawings concerning the main logic board, transit board, RAM board and ROM

board MS are omitted.

– 62 –

5. Connection Wiring Diagram

5-1. General Connection Wiring Diagram

LVPS ASSY

PL 6.1

MAINTENANCE GUIDE

P/J2

INLET

For
LS-5TT

P/J1
P/J3

P/J11

RAM BOARD

PL 6.11

J1
J2

TRANSIT

BD RAM

PL 6.17

J1

J12

P/J6

ROM BOARD

MS

PL 6.16

J1
J2

TRANSIT

BD PDL
PL 6.18

J1
J7

MAIN LOGIC BOARD

PL 6.19

J10

J1

FONT

CARTRIDGE

PL 6.15

P/J200

CONSOLE ASSY
PL 3.32

FAN
PL 6.5

PICK UP SOLENOID
PL 3.24

EXIT SENSOR
PL 4.29

INLET CHUTE ASSY
PL 3.15

REGI. SENSOR
PL 3.17

P/J5

J8J1J9

J2

RAM MODULE

1MB ASSY

PL 6.12

P/J301

P/J120

P/J11

MCU PCB

PL 6.4

P32

P31

J4

P/J18

P/J17

P/J16P/J119

P/J12

P/J19

P/J13 P/J115

P/J14

P/J101

P/J112

P/J114

P/J113

P/J116

P/J201 P/J202

FEED SOLENOID

PL 2.3

P/J115

P/J201 P/J202

FEED SOLENOID

PL 7.3
PL 8.3

FUSER ASSY

PL 4.1

ROS ASSY

PL 5.2

FEEDER PCB

PL 2.15

TURN SOLENOID

PL 2.4

FEEDER PCB AUX

PL 7.15
PL 8.15

TURN SOLENOID

PL 7.4
PL 8.4

DRIVE ASSY

PL 5.5

MBF SENSOR
PL 3.27

P/J121

HVPS
PL 6.2

P/J RTN P/J RTN P/J TR P/J DB P/J CR

TRANS. CHUTE ASSY

PL 3.12

: Indicates connections where screws are used.
(Grounding is done through the LVPS frame.)

: Indicates that parts vary according to the
model type. Refer to Section 9 in Chapter 6.

P/J15

P/J111

P/J TR-T

BTR ASSY

PL 3.11

BTR ASSY

PL X.Y

– 63 –

P/J118

CRU SENSOR PCB

PL 5.7

EARTH PLATE ASSY

PL 6.6

EPX TONER 
CARTRIDGE

PL 5.1

: Indicates connections through the harness.
: Indicates a connection in the interior of the part.
: Indicates the name of the part.
: Indicates section "X", drawing number "Y" 
on the Parts List in Chapter 6.

MAINTENANCE GUIDE

5-2. Connection Wiring Drawing between Parts

The connection wiring drawing is divided into 11 sections to show detailed connections between parts.
(1) [LVPS assy ↔ MCU PCB]

• Connection between LVPS assy and MCU PCB

(2) [LVPS assy ↔ fuser assy]

• Connection between LVPS assy and fuser assy

(3) [MCU PCB ↔ POS assy]

• Connection between MCU PCB and POS assy

(4) [MCU PCB ↔ feeder PCB ↔ feeder PCB aux ↔ feed solenoid, turn solenoid]

• Connection between MCU PCB and feeder PCB

• Connection between feeder PCB and feeder PCB aux

• Connection between feeder PCB and feed solenoid

• Connection between feeder PCB and turn solenoid

• Connection between feeder PCB aux and feed solenoid

• Connection between feeder PCB aux and turn solenoid

(5) [MCU PCB ↔ drive assy]

• Connection between MCU PCB and drive assy

(6) [MCU PCB ↔ HVPS ↔ earth plate assy, trans. chute assy ↔ BTR assy: MCU PCB ↔ CRU sensor PCB]

• Connection between MCU PCB and HVPS

• Connection between HVPS and earth plate assy

• Connection between HVPS and trans. chute assy

• Connection between trans. chute assy and BTR assy

• Connection between MCU PCB and CRU sensor PCB

(7) [MCU PCB ↔ exit sensor, regi. sensor, MBF sensor]

• Connection between MCU PCB and exit sensor

• Connection between MCU PCB and regi. sensor

• Connection between MCU PCB and MBF sensor

(8) [MCU PCB ↔ pick up solenoid, fan]

• Connection between MCU PCB and pick up solenoid

• Connection between MCU PCB and fan

(9) [main logic board ↔ console assy]

• Connection between main logic board and console assy

(10) [LVPS assy ↔ main logic board ↔ MCU PCB]

• Connection between LVPS assy and main logic board

• Connection between main logic board and MCU PCB

(11) [ROM Board MS ↔ Transit BD PDL ↔ Main Logic Board ↔ Transit BD RAM ↔ RAM Board]

• Connection between ROM board MS and transit BD PDL board

• Connection between transit BD PDL board and main Logic board

• Connection between main logic board and transit BD RAM board

• Connection between transit BD RAM board and RAM board

– 64 –

• Cautionary instructions for using connection wiring drawing

MAINTENANCE GUIDE

Description

MCU PCB

PLX.Y

MAIN MOTOR

220-240V PRINTER

P/J11

–X⊃

Indicates the part listed in “Chapter 6. Parts List,” denoting the drawing
number “Y” in Section “X” of the same chapter.

Indicates a functional part, denoting its name.

Indicates a different content depending on specifications, denoting the
relevant specification.

P,–: Show the plug side of the connector.
J, ⊃ and : Show the jack side of the connector.
X: Indicates a pin number of the connector.

Indicates a connection between wires.

Indicates connection which differs depending on specifications.

Indicates connection with a screw.

⊃

24VDC

HEATER ROD ON(L) 4.2VDC

5VDC

SG
FG

RTN

*

Indicates connection by wiring, etc., denoting its signal line name and
contents.

Indicates a function and a logical value showing operating condition of a
signal (low: L, high: H), denoting a voltage when the value of a signal is low.

DC voltage shows a value measured when the minus side is connected to
SG.

SG: Indicates signal ground.
FG: Indicates frame ground.
RTN: Indicates return.
The area between SG and RTN is conducting.
FG and SG include a connective type and a separate one.

Indicates a reference item related to a section with this mark.

– 65 –

MAINTENANCE GUIDE

5-2-1. LVPS Assy ↔ MCU PCB

LVPS ASSY

PL 6.1

RELAY

FG

INTER-

LOCK

SWITCH

–
–

P/J2

1
2

MCU PCB

P/J11

HEATER ROD ON(L) 4.2VDC

SG

VS

SG

5VDC-LD

5VDC

SG
RTN
RTN

24VDC
24VDC
24VDC
TEMP.

SG

P101

⊃
⊃

–

4

–

1

–

⊃

1

–

⊃

2

–

⊃

3

–

⊃

4

–

⊃

5

–

⊃

6

–

⊃

7

–

⊃

8

–

⊃

9

–

⊃

10

–

11

⊃

–

12

⊃

–

⊃

13

–

14

⊃

PL 6.4

P15

–8

P18

–3

Signal line name Reference

5VDC-LD LD power voltage of LD assy of ROS assy

VS Voltage drop signal: Outputs 5V DC when power is OFF.

TEMP. Data of temp. sensor assy’s thermistor

*1: Short prevention of power voltage output from LVPS assy

Output status

: Output continues during shorting.

✕: Output stops during shorting.

5VDC-LD 5VDC 24VDC

5VDC-LD ✕A

✕A: Automatic restore after release of

shorting

✕B: Output restores by turning power OFF

5VDC ✕B ✕B ✕B

24VDC ✕A ✕A ✕A

Short output

after release of shorting and by turn­ing power ON again 2 or 3 minutes
later.

*2: Stopping output by no-load condition of LVPS assy

When power is turned ON while making LVPS assy no-load by removing the connector (P/J11) on MCU PCB,
output decreases after a little while (about 1 minute), and entire output stops.
Turn power OFF, connect the connector (P/J11) to provide load, and, about 5 minutes later, turn power ON again,
and output restores.

– 66 –

5-2-2. LVPS Assy ↔ Fuser Assy

LVPS ASSY

PL 6.1

J11

⊃
⊃

14
13

MAINTENANCE GUIDE

FUSER ASSY

PL 4.1

P/J2

–

2

–

1

INTERLOCK

SWITCH

RELAY

MAIN POWER

SWITCH

100-115V PRINTER

P/J101

⊃
⊃

TEMP.

SG
FG

AC N

AC L

–
–
–
–
–

220-240V PRINTER

–
–
–
–
–

1
4
5
2
6

P/J101

1
4
5
3
6

⊃
⊃
⊃
⊃
⊃

⊃
⊃
⊃
⊃
⊃

TEMP. SENSOR ASSY

PL 4.11

THERMISTOR

H/R BEARING L

PL 4.15

HEATER ROD

PL 4.13

FUSE

PL 4.9

FG

THERMOSTAT

PL 4.8

Signal line name Reference

TEMP. Data of temp. sensor assy’s thermistor

AC N Neutral side of AC input from power supply
AC L Line side of AC input from power supply

*1: Fusing temperature of fuse; ambient temperature, 141°C
*2: Contact open temperature of thermostat; contact temperature, 150°C
*3: Rated power of heater rod
100-115 V printer, 280±14 W; 220-240 V printer, 350±17.5 W
*4: Resistance value of temp. sensor assy’s thermistor

Temperature (°C) 10 20 30 150 160 170 180

Resistance value (KΩ) 348~526 223~327 146~209 2.9~3.4 2.3~2.6 1.8~2.1 1.4~1.7

– 67 –

MAINTENANCE GUIDE

5-2-3. MCU PCB ↔ ROS Assy

MCU PCB

P15

9–

PL 6.4

–
–
–
–
–
–
–
–
–
–
–
–
–

P/J12

1
2
3
4
5
6
7
8

9
10
11
12
13

⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃

SCANNER MOTER ON(L) 4.1VDC

⊃
⊃
⊃

DATA
5VDC

MO
VL2
VL1

SG

5VDC-LD

SPI 2
SPI 1

SG

RTN

24VDC

P/J112

⊃

7

⊃

6

⊃

5

⊃

4

⊃

3

⊃

2

⊃

1

P/J114

⊃

6

⊃

5

⊃

4

⊃

3

⊃

2

⊃

1

–
–
–
–
–
–
–

SCANNER ASSY

–
–
–
–
–
–

ROS ASSY

PL 5.2

LD ASSY

SOS PCB

–
–
–

P/J19

1
2
3

⊃
⊃
⊃

SG

SOS

5VDC

P/J113

⊃

3

⊃

2

⊃

1

–
–
–

Signal line name Reference

DATA

A signal to cause emission of the LD from MCU PCB to LD assy
(LD ON(L) 3.7 V DC)

MO Monitoring of output to LD based on data (for adjusting LD power)

VL2, VL1 Adjusts LD power.

5VDC-LD LD power voltage of ROS assy’s LD

SPI 2, SPI 1 Controls scanner motor revolution. SPI 1=“H”, SPI 2=“L” for a resolution of 300 dpi

SOS

Start reference signal for scanning by ROS assy’s scanner motor based on a laser

beam entering into SOS sensor

– 68 –

MAINTENANCE GUIDE

5-2-4. MCU PCB ↔ Feeder PCB ↔ Feeder PCB aux ↔ Feed Solenoid, Turn Solenoid

MCU PCB

PL 6.4

FEEDER ASSY

PL 2.1

FEEDER PCB

PL 2.15

P/J13
–
–
–
–
–
–
–
–
–
–
–
–

[1] NO PAPER SENSOR ON(L) 5VDC

⊃

1

⊃

2

[2] NO PAPER SENSOR ON(L) 5VDC

⊃

3

⊃

4

⊃

5

⊃

6

⊃

7

⊃

8

⊃

9

⊃

10

⊃

11

⊃

12

[1] PAPER SIZE
[2] PAPER SIZE

[1] TURN SOLENOID ON(L) 24VDC
[2] TURN SOLENOID ON(L) 24VDC

[1] FEED SOLENOID ON(L) 24VDC
[2] FEED SOLENOID ON(L) 24VDC

5VDC

SG

24VDC

24VDC

FEED SORENOID

PL 2.3

TURN SORENOID

PL 2.4

P/J115

⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃

10

⊃

11

⊃

12

P/J201

⊃
⊃

P/J202

⊃
⊃

P/J116

–

1

–

2

–

3

–

4

–

5

–

6

–

7

–

8

–

9

–
–
–

2

–

1

–

–

2

–

1

–
–
–
–
–
–
–
–
–
–
–
–

⊃

1

⊃

2

⊃

3

⊃

4

⊃

5

⊃

6

⊃

7

⊃

8

⊃

9

⊃

10

⊃

11

⊃

12

FEED SORENOID

TURN SORENOID

PL 7.3

PL 7.4

FEEDER ASSY 2TRAY

FEEDER PCB AUX

PL 7.15

P/J115

⊃

–

1

⊃

–

2

⊃

–

3

⊃

–

4

⊃

–

5

⊃

–

6

⊃

–

7

⊃

–

8

⊃

–

9

⊃

–

10

⊃

–

11

⊃

–

12

P/J201

⊃

2

–

⊃

1

–

P/J202

⊃

–

2

⊃

–

1

PL 7.1

Note 1: Signals with [1] at the head of their names relate to tray 1 (upper feeder unit), while signals with [2] relate to tray

2 (lower feeder unit).

Signal line name Reference

NO PAPER SENSOR ON(L) 5VDC

Detection signal of the presence or absence of paper in the paper cassette
(high level for no paper and low level for its presence)

PAPER SIZE Data on paper size switch based on the paper size of the paper cassette

*1: Coil resistance of solenoid

Feed solenoid 120Ω±10% (at 20°C)
Turn solenoid 220Ω±10% (at 20°C)

– 69 –

MAINTENANCE GUIDE

*2: Paper size related data

Paper size switch

Paper size of paper cassette

SW1 SW2 SW3 SW4

(no corresponding tray) – – – – 0.0VDC

(no paper cassette) 0 0 0 0 0.275~0.293VDC

Monarch 0 0 0 1 0.554~0.583VDC
COM-10 0 1 0 0 1.396~1.445VDC

A4 0 1 0 1 1.680~1.730VDC
C5 0 1 1 0 1.962~2.015VDC

DL 0 1 1 1 2.248~2.298VDC

Executive 1 0 0 0 2.530~2.584VDC

B5 1 0 0 1 2.814~2.868VDC

Legal 14" 1 0 1 0 3.098~3.152VDC

Letter 1 1 0 1 3.959~3.996VDC

(0: OFF; 1: ON)
[Paper size switches are SW1, SW2, SW3 and SW4 with top to bottom in sequence]

Paper size signal

voltage value

– 70 –

5-2-5. MCU PCB ↔ Drive Assy

MAINTENANCE GUIDE

MCU PCB

PL 6.4

P/J14
–
–
–
–
–
–

⊃

1

⊃

2

⊃

3

⊃

4

⊃

5

⊃

6

*1: Description of drive assy’s main motor

• The main motor is a stepping motor.

• Excitation sequence of the main motor

24VDC
24VDC

A
B

/A
/B

DRIVE ASSY

PL 5.5

MAIN MOTOR

Step (two-phase excitation)

Phase

1234

A––

B––

A––

B– –

–: Excitation

•Step angle: 7.5 ±0.75°

• Frequency when the main motor is rotating at constant speed: 323 pps (pps: pulse per second)

– 71 –

MAINTENANCE GUIDE

5-2-6. MCU PCB ↔ HVPS ↔ Earth Plate Assy, Trans. Chute Assy, Inlet Chute Assy ↔ BTR Assy: MCU

PCB ↔ CRU Sensor PCB

MCU PCB

PL 6.4

P11

5–

P12

7–

–
–
–
–
–
–
–
–
–
–
–

P/J15

1
2
3
4
5
6
7
8

9
10
11

⊃

DB ON(L) 24VDC

⊃

TR(+) ON(L) 24VDC

⊃

TR ON(L) 24VDC

⊃

CR(DC) ON(L) 24VDC

⊃

CR(AC) ON(L) 24VDC

⊃
⊃
⊃
⊃
⊃
⊃

5VDC-LD
5VDC-LD

EP CHECK ON(L) 5VDC

RTN

24VDC

SG

P/J111

⊃

7

⊃

6

⊃

5

⊃

4

⊃

3

⊃

2

⊃

1

HVPS

PL 6.2

–
–
–
–
–
–
–

P/J RTN

1

–

P/J TR

1

–

P/J CR

1

–

P/J DB

–

1

–

2

P/J RTN

1

–

P/J118

⊃
⊃
⊃
⊃

4
3
2
1

EARTH
PLATE ASSY
PL 6.6

PL 5.7

LD SWITCH

CRU SWITCH

RTN

TR

CR

RTN

DB

RTN

(S101)

(S100)

⊃

⊃

⊃

⊃
⊃

⊃

CRU SENSOR PCB

–
–
–
–

EPX TONER
CARTRIDGE
PL 5.1

BCR

BRUM

MAGNETIC

ROLL

P/J TR-T

⊃

BTR

ASSY

TRANS.
CHUTE ASSY
PL 3.12

1–

INLET
CHUTE ASSY
PL 3.15

Signal line name Reference

DB ON(L) 24VDC DB output signal (both DC and AC components are output)

TR(+) ON(L) 24VDC Output signal of TR plus side

TR ON(L) 24VDC Output signal of TR (TR is output on both plus and minus sides)
CR(DC) ON(L) 24VDC Output signal of DC component of CR
CR(AC) ON(L) 24VDC Output signal of AC component of CR

5VDC-LD LD power supply of ROS assy’s LD assy

EP CHECK ON(L) 5VDC Detection signal of the presence or absence of EPX toner cartridge

CR Output from HVPS to BCR
DB Output from HVPS to magnetic roll

TR Output from HVPS to BTR

*1: The drum is grounded at P/J DB-1 pin’s RTN.

– 72 –

*2: Rated output of HVPS

Output name Rated output Remark

CR(AC) 200µA(rms) f=150Hz
CR(DC) –360VDC

TR(+) 1.5µA 1000VDC

TR(–) –600VDC
DB(AC) 1.6KVp-p f=2.4KHz
DB(DC) –270VDC

MAINTENANCE GUIDE

– 73 –

MAINTENANCE GUIDE

5-2-7. MCU PCB ↔ Exit Sensor, Regi. Sensor, MBF Sensor

MCU PCB

PL 6.4

5VDC

–
–
–
–
–
–
–
–
–

P/J16

1
2
3
4
5
6
7
8
9

⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃

1.2VDC
SG

EXIT SENSOR ON(L) 5VDC

1.2VDC
SG

REGI. SENSOR ON(L) 5VDC

1.2VDC
SG

MBF SENSOR ON(L) 5VDC

P/J119

⊃

3

⊃

2

⊃

1

P/J120

⊃

3

⊃

2

⊃

1

P/J121

⊃

3

⊃

2

⊃

1

EXIT SENSOR

PL 4.29

–
–
–

REGI. SENSOR

PL 3.17

–
–
–

MBF SENSOR

PL 3.27

–
–
–

Signal line name Reference

Detection signal of passing condition of printing paper at the paper exit area

EXIT SENSOR ON(L) 5VDC

(high level for no paper and low level for its presence)
Detection signal of passing condition of paper at the inlet chute area

REGI. SENSOR ON(L) 5VDC

(high level for no paper and low level for its presence)
Detection signal of the presence or absence of paper in the multi-purpose tray

MBF SENSOR ON(L) 5VDC

(high level for no paper and low level for its presence)

*1: With a supply voltage of 5 V DC from MCU PCB applied through resistance, the sensor driving supply has attenuated

to about 1.2 V DC.

– 74 –

5-2-8. MCU PCB ↔ Pick Up Solenoid, Fan

MCU PCB

PL 6.4

MAINTENANCE GUIDE

P11

12 –

P/J17

–
–

P/J18

–
–
–

P/J21

–
–
–

P/J301

⊃

1

PICK UP SOLENOID ON(L) 24VDC

⊃

2

⊃

1

⊃

2

⊃

3

⊃

1

⊃

2

⊃

3

24VDC

RTN

24VDC

⊃
⊃

–
–

1

⊃
⊃

2

FAN

PL 6.5

PICK UP

SOLENOID

PL 3.24

–

⊃

4

*1: Coil resistance of pick up solenoid: 120 Ω±10% (at 20°C)

– 75 –

MAINTENANCE GUIDE

5-2-9. Main Logic Board ↔ Console Assy

MAIN LOGIC
BOARD
PL 6.19

CONSOLE ASSY

PL 3.32

⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃

P/J200

A1
A2
A3
A4
A5
A6
A7
A8

A9
A10
A11
A12

B1

B2

B3

B4

B5

B6

B7

B8

B9
B10
B11
B12

–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–

P/J6
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–

A1
A2
A3
A4
A5
A6
A7
A8

A9
A10
A11
A12

B1

B2

B3

B4

B5

B6

B7

B8

B9
B10
B11
B12

⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃

VCC
LCDE
LCD4
LCD6

SW6

SW4

SW2

LED1 ON(L)
LED2 ON(L)
LED3 ON(L)

SW8

SG
SG

RS
LCD5
LCD7

SW7
SW5
SW3

SW1
LED4 ON(L)
LED5 ON(L)

BZ

VCC

– 76 –

5-2-10. LVPS Assy ↔ Main Logic Board ↔ MCU PCB

MAINTENANCE GUIDE

LVPS ASSY

PL 6.1

5VDC
5VDC

SG
SG

⊃
⊃
⊃
⊃

P/J5

1
2
3
4

MAIN LOGIC 

BOARD

PL 6.19

–
–
–
–

J4/P31

⊃

A1

⊃

A2

⊃

A3

⊃

A4

⊃

A5

⊃

A6

⊃

A7

⊃

A8

⊃

A9

⊃

A10

⊃

B1

⊃

B2

MCU PCB

PL 6.4

–
–
–
–
–
–
–
–
–
–
–
–

⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃

B3
B4
B5
B6
B7
B8
B9

B10

1
2

P32

–
–
–
–
–
–
–
–

–
–

TEST PRINT ON(L) 5VDC

SG

– 77 –

MAINTENANCE GUIDE

5-2-11. ROM Board MS ↔ Transit BD PDL ↔ Main Logic Board ↔ Transit BD RAM ↔ RAM Board

ROM BOARD

MS

⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃

J1/J2

A1
A2
A3
A4
A5
A6
A7
A8

A9
A10
A11
A12
A13
A14
A15
A16
A17
A18
A19
A20
A21
A22
A23
A24
A25
A26
A27
A28
A29
A30
A31
A32
A33
A34

B1

B2

B3

B4

B5

B6

B7

B8

B9
B10
B11
B12
B13
B14
B15
B16
B17
B18
B19
B20
B21
B22
B23
B24
B25
B26
B27
B28
B29
B30
B31
B32
B33
B34

TRANSIT

BD PDL

J1/J12

–

GND

–

GND
–
–
–
–
–
–
–
–
–
–
–
–
–
–

GND

–
–

GND
–
–
–
–
–
–
–
–

GND

–
–

GND
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–

VCC

VCC
GND

GND

VCC
GND
GND

GND

GND

GND
GND

GND

VCC

⊃

A1

⊃

A2

⊃

A3

⊃

A4

⊃

A5

⊃

A6

⊃

A7

⊃

A8

⊃

A9

⊃

A10

⊃

A11

⊃

A12

⊃

A13

⊃

A14

⊃

A15

⊃

A16

⊃

A17

⊃

A18

⊃

A19

⊃

A20

⊃

A21

⊃

A22

⊃

A23

⊃

A24

⊃

A25

⊃

A26

⊃

A27

⊃

A28

⊃

A29

⊃

A30

⊃

A31

⊃

A32

⊃

A33

⊃

A34

⊃

B1

⊃

B2

⊃

B3

⊃

B4

⊃

B5

⊃

B6

⊃

B7

⊃

B8

⊃

B9

⊃

B10

⊃

B11

⊃

B12

⊃

B13

⊃

B14

⊃

B15

⊃

B16

⊃

B17

⊃

B18

⊃

B19

⊃

B20

⊃

B21

⊃

B22

⊃

B23

⊃

B24

⊃

B25

⊃

B26

⊃

B27

⊃

B28

⊃

B29

⊃

B30

⊃

B31

⊃

B32

⊃

B33

⊃

B34

–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–

MAIN LOGIC

BOARD

TRANSIT

BD RAM

J7/J1

⊃

–

A1

⊃

–

A2

⊃

–

A3

⊃

–

A4

⊃

–

A5

⊃

–

A6

⊃

–

A7

⊃

–

A8

⊃

–

A9

⊃

–

A10

⊃

–

A11

⊃

–

A12

⊃

–

A13

⊃

–

A14

⊃

–

A15

⊃

–

A16

⊃

–

A17

⊃

–

A18

⊃

–

A19

⊃

–

A20

⊃

–

A21

⊃

–

A22

⊃

–

A23

⊃

–

A24

⊃

–

A25

⊃

–

A26

⊃

–

A27

⊃

–

A28

⊃

–

A29

⊃

–

A30

⊃

–

B1

⊃

–

B2

⊃

–

B3

⊃

–

B4

⊃

–

B5

⊃

–

B6

⊃

–

B7

⊃

–

B8

⊃

–

B9

⊃

–

B10

⊃

–

B11

⊃

–

B12

⊃

–

B13

⊃

–

B14

⊃

–

B15

⊃

–

B16

⊃

–

B17

⊃

–

B18

⊃

–

B19

⊃

–

B20

⊃

–

B21

⊃

–

B22

⊃

–

B23

⊃

–

B24

⊃

–

B25

⊃

–

B26

⊃

–

B27

⊃

–

B28

⊃

–

B29

⊃

–

B30

GND

GND

GND

VCC

GND

VCC

GND

GND

GND

VCC

VCC
GND
VCC
GND

GND

VCC

GND

J2/J1

–

A1

–

A2

–

A3

–

A4

–

A5

–

A6

–

A7

–

A8

–

A9

–

A10

–

A11

–

A12

–

A13

–

A14

–

A15

–

A16

–

A17

–

A18

–

A19

–

A20

–

A21

–

A22

–

A23

–

A24

–

A25

–

A26

–

A27

–

A28

–

A29

–

A30

–

B1

–

B2

–

B3

–

B4

–

B5

–

B6

–

B7

–

B8

–

B9

–

B10

–

B11

–

B12

–

B13

–

B14

–

B15

–

B16

–

B17

–

B18

–

B19

–

B20

–

B21

–

B22

–

B23

–

B24

–

B25

–

B26

–

B27

–

B28

–

B29

–

B30

RAM BOARD

⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃
⊃

– 78 –

CHAPTER 5

TROUBLESHOOTING

1. Troubleshooting Procedures ......................................................................................... 81

1-1. Flow of Breakdown Recovery Steps.................................................................................. 81

1-2. Advance Confirmation ........................................................................................................ 81

1-3. Precautions Regarding Operations ................................................................................... 82

1-4. Precautions When Carrying Out FIP.................................................................................. 82

2. Level 1 FIP........................................................................................................................ 83

2-1. Control Panel Displays the Error Message “CALL SERVICE 20” ................................... 84

2-2. Control Panel Displays the Error Message “CALL SERVICE 04,05,06,07,10,11” .......... 84

2-3. Control Panel Displays the Error Message “CALL SERVICE 08” ................................... 85

2-4. Control Panel Displays the Error Message “CALL SERVICE 03” ................................... 85

2-5. Control Panel Displays the Error Message “CALL SERVICE 01” ................................... 86

2-6. Control Panel Displays the Error Message “CLOSE COVER” ........................................ 87

2-7. Control Panel Displays the Error Message “PAPER JAMMING” .................................... 87

2-8. Control Panel Displays the Error Message “SET EP CARTRIDGE” ............................... 90

2-9. Control Panel Displays the Error Message
2-10. Control Panel Displays the Error Message “CASS: REFILL ???” or

“LCAS: REFILL ???” or “TRAY: REFILL ???” ................................................................. 91

2-11. Control Panel Displays the Error Message “CASS: CHANGE ???” or

“LCAS: CHANGE ???” or “TRAY: CHANGE ???” ........................................................... 92

2-12. Abnormal Operation............................................................................................................ 93

2-12-1. Power is not Supplied .................................................................................................. 94

2-12-2. Faulty LCD Display ....................................................................................................... 96

2-12-3. Faulty LED Display ....................................................................................................... 96

2-12-4. Faulty Key Switch ......................................................................................................... 97

2-12-5. Abnormal Printing Operation ...................................................................................... 97

2-12-6. Drive Assy does not Work ........................................................................................... 98

2-12-7. Fan does not Rotate ..................................................................................................... 98

“LOAD ??? CASS.” or “LOAD ??? LCAS.”....

90

5

3. Level 2 FIP........................................................................................................................ 99

3-1. Faulty LVPS Assy 5VDC ..................................................................................................... 99

3-2. Faulty LVPS Assy 24VDC ................................................................................................... 99

3-3. Faulty Scanner Assy ......................................................................................................... 100

3-4. Faulty ROS Assy................................................................................................................ 100

3-5. Faulty Heater Rod.............................................................................................................. 101

3-6. Faulty Temp. Sensor Assy................................................................................................ 102

3-7. Faulty Exit Sensor ............................................................................................................. 102

3-8. Faulty Regi. Sensor ........................................................................................................... 103

3-9. Faulty MBF Sensor ............................................................................................................ 103

3-10. Faulty No Paper Sensor .................................................................................................... 104

3-11. Faulty LD Switch................................................................................................................ 105

3-12. Faulty CRU Switch............................................................................................................. 106

3-13. Faulty Paper Size Switch .................................................................................................. 107

3-14. Faulty Pick Up Solenoid.................................................................................................... 108

3-15. Faulty Feed Solenoid ........................................................................................................ 109

3-16. Faulty Turn Solenoid......................................................................................................... 110

3-17. Faulty Drive Assy .............................................................................................................. 111

3-18. Faulty HVPS CR (CD) ........................................................................................................ 112

3-19. Faulty HVPS DB ................................................................................................................. 112

3-20. Faulty HVPS TR ................................................................................................................. 113

3-21. Noise................................................................................................................................... 114

4. Image Defects ................................................................................................................ 116

TROUBLESHOOTING

– 80 –

TROUBLESHOOTING

1. Troubleshooting Procedures

Troubleshooting can be carried out most effectively by first confirming the problem, and checking the various factors
involved in advance, before using FIP (Fault Isolation Procedure) to pinpoint the problem.

1-1. Flow of Breakdown Recovery Steps

The following flowchart shows the steps taken when a breakdown occurs.

Confirmation of

conditions/problem

Advance confirmation

Start

Level 1 FIP

Chapter 4. Maintenance

Guide

Level 2 FIP

Confirmation of

breakdown recovery

Preventive maintenance

End

1-2. Advance Confirmation

Before beginning troubleshooting operations, always check the items noted below.
a. Make sure the power supply voltage is within the specified values. (Measure the voltage at the power supply outlet.)
b. Make sure the power cord has not been damaged, shorted, or disconnected, and that it is connected correctly.
c. Make sure the equipment has been grounded properly.
d. Avoid installing the printer in a location where it is exposed to extremely high or low temperatures, high or low

humidity, or sudden changes of temperature.

e. The printer should not be located in a hot or humid area (such as near a water faucet or humidifier), near open flames,

or in a dusty place.
f. The printer should not be exposed to volatile gases or combustible gases.
g. The printer should not be exposed to direct sunlight. (If it has to be placed in a sunny location, the window should

be curtained.)
h. The room should be well ventilated.
i. The printer is installed on a solid, level surface.
j. The recommended paper is being used. (if the paper is too thick or too thin, or tends to curl, paper jams or transfer

problems may occur, or prints may be blurred.

– 81 –

TROUBLESHOOTING

1-3. Precautions Regarding Operations

1. Electrical box

When checking operations with the cover removed from the electrical box and the power turned on, remove the

connector on the HVPS (P/J111), unless otherwise indicated.

(Since the exit sensor has been removed, however, the error message “PAPER JAMMING” will be displayed on the

control panel when printing is carried out.)

2. Be careful to avoid burns when touching high-temperature components.

3. When working with the equipment, use wrist bands and other means of grounding whenever possible, to discharge

static electricity from the operator’s body and avoid electrical shock.

1-4. Precautions When Carrying Out FIP

1. FIP assumes that the main logic board is functioning normally. However, if the problem cannot be corrected using

the troubleshooting procedures, the main logic board should be replaced and operation checked.

2. When FIP is used to carry out troubleshooting procedures, a normal MCU PCB and EPX toner cartridge should be

on hand and ready for use, in order to distinguish the cause of the breakdown.

3. With the “Step 1” carried out as part of FIP, the components making up the main parts to be confirmed, as well as

any related parts, must be checked in addition to the parts listed under “Main Parts to be Checked”.

4. When the FIP procedures indicate that the power should be turned on, this should be done in online mode unless

otherwise specified.

5. Connectors are marked as indicated below.

“P/J12” → Indicates that connector (P/J12) is connected.

“P12” → Plug side with connector (P/J12) disconnected (except when connected directly to PCB)

“J12” → Jack side with connector (P/J12) disconnected (except when connected directly to PCB)

6. The item “P/J1-2PIN ↔ P/J3-4PIN” in FIP indicates that the positive (+) side of the measuring instrument should

be connected to Pin 2 of P/J1, and the negative (–) side should be connected to Pin 4 of P/J3 for measurement.

7. With the item “P/J1 ↔ P/J2” in FIP, please refer to Chapter 4, Section 5, “Connection Wiring Diagram”, and measure

all of the corresponding terminals between P/J1 and P/J2.

8. When measuring the voltage, set the EPX toner cartridge and paper cassette in place even if they are not particularly

required for the measurement, and close the front cover (the interlock switch will be ON). Then turn on the power

supply and measure the voltage.

9. The values noted in FIP should be taken as a general guide, and if the value measured for the voltage is in close

proximity to the rated voltage value, it should be judged acceptable.

10. Parts which must always be removed, or operation steps to be carried out in order for confirmation to be carried out

in FIP are not marked in any particular way.

11. Replacement of parts which are considered to be possible sources of problems is indicated in FIP. Replace those parts,

as well as their component parts, and confirm the operation.

– 82 –

2. Level 1 FIP

Problem which
causes error mes­sage to be displayed

TROUBLESHOOTING

2-1. CALL SERVICE 20

2-2. CALL SERVICE 04

CALL SERVICE 05
CALL SERVICE 06
CALL SERVICE 07
CALL SERVICE 10
CALL SERVICE 11

2-3. CALL SERVICE 08

2-4. CALL SERVICE 03

2-5. CALL SERVICE 01

2-6. CLOSE COVER

Start

2-7. PAPER JAMMING

2-8. SET EP CARTRIDGE

2-9. LOAD ??? CASS.

LOAD ??? LCAS.

3. Level 2 FIP

2-10. CASS :REFILL ???

LCAS :REFILL ???
TRAY:REFILL ???

2-11. CASS :CHANGE ???

LCAS :CHANGE ???
TRAY:CHANGE ???

Problems with operation 2-12. Abnormal Operation

Problems with image quality 4. Image Defects

– 83 –

TROUBLESHOOTING

2-1. Control Panel Displays the Error Message “CALL SERVICE 20”

Step Check

1 Check parts with different specifications for problems with

usage, defective installation, breakage, and deformation.

• Main parts to be checked:

(1) MCU PCB

2 Does problem recur if power is turned on again?

3 Does problem recur if power is turned off and on several times?

*1: The problem is thought to be caused by external noise, but just to be sure, go on to Section 3-21, “Noise”, and check

as described in this section.
Note: If the problem recurs even after the MCU PCB is replaced with a normal one, check as described in Section 3-21,

“Noise”.

YES NO

To step 2

Replace MCU
PCB.

Replace MCU
PCB.

Measure

Replace or
reinstall.

To step 3

Processing
completed *1.

2-2. Control Panel Displays the Error Message “CALL SERVICE 04,05,06,07,10,11”

Step Check

YES NO

Measure

1 Check parts with different specifications for problems with

usage, defective installation, breakage, and deformation.

• Main parts to be checked:

(1) Main logic board

2 Does problem recur when power is turned on again?

3 Does problem recur if power is turned off and on several times?

*1: The problem is thought to be caused by external noise, but just to be sure, go on to Section 3-21, “Noise”, and check

as described in this section.
Note: If the problem recurs even after the main logic board is replaced with a normal one, check as described in Section

3-21, “Noise”.

To step 2

Replace main
logic board.

Replace main
logic board.

Replace or
reinstall.

To step 3

Processing
completed *1.

– 84 –

2-3. Control Panel Displays the Error Message “CALL SERVICE 08”

TROUBLESHOOTING

Step Check

1 Check parts with different specifications for problems with

usage, defective installation, breakage, and deformation.

• Main parts to be checked:

(1) Optional RAM board

2 Does problem recur if power is turned on again?

3 Does problem recur if power is turned off and on several times?

*1: The problem is thought to be caused by external noise, but just to be sure, go to Section 3-21, “Noise”, and check

as described in this section.

Note: If the problem recurs even after the optional RAM board is replaced with a normal one, check as described in

Section 3-21, “Noise”.

YES NO

To step 2

Replace optional

RAM board.

Replace optional

RAM board.

Measure

Replace or
reinstall.

To step 3

Processing
completed *1.

2-4. Control Panel Displays the Error Message “CALL SERVICE 03”

Step Check

YES NO

Measure

1 Check parts with different specifications for problems with

usage, defective installation, breakage, and deformation.

• Main parts to be checked:

(1) ROS assy, (2) MCU PCB, (3) CRU sensor PCB
(4) EPX toner cartridge, (5) Harness assy HVPS
(6) Harness assy ROS, (7) Harness assy SOS
(8) LVPS assy

2 (Check scanner assy of ROS assy) *1

Check to see if the scanner motor of the ROS assy is rotating
when the Test Print mode is accessed, and if the rotation sound
can be heard.

3 (Check LD power supply for LD assy of ROS assy) *2

Is 5 VDC being supplied between P12 - 7PIN ↔ P12 - 6PIN?

4 (Check LD power supply for LD assy of ROS assy) *2

Is 5 VDC being supplied between P15 - 8PIN ↔ P/J11-2 PIN?

*1: If it is hard to hear the sound of the scanner motor rotating, disconnect the drive assy connector (P/J14) and stop the

main motor in order to hear the sound better.

*2: Disconnect the connector (P/J111) from the HVPS and check.

To step 2

To step 3

To section 3-4

Replace MCU
PCB.

Replace or
reinstall.

To section 3-4

To step 4

To section 3-1

– 85 –

TROUBLESHOOTING

2-5. Control Panel Displays the Error Message “CALL SERVICE 01”

Step Check

1 Check parts with different specifications for problems with

usage, defective installation, breakage, and deformation.

• Main parts to be checked:

(1) Fuser assy, (2) Temp. sensor assy, (3) Heater rod
(4) MCU PCB, (5) LVPS assy

2 (Check temp. sensor assy)

Does the problem occur when the power is turned on?

3 (Check power supply to heater rod)

With the fuser assy cold, see if the heater rod lights up when the
power is turned on.

4 Does the problem occur while the fuser is warming up? *1

5 (Check power supply of heater rod) *1 *2

100-115V models: Is the voltage range between P/J101-2PIN

↔ P/J101-6PIN 90-132 VAC?

220-240V models: Is the voltage range between P/J101-3PIN

↔ P/J101-6PIN 198-264 VAC?

• Measure the voltage while the fuser is still warming up,

before an error message is displayed.

Measure

YES NO

To step 2

To section 3-6

To step 4

To step 5

To section 3-6

Replace or
reinstall.

To step 3

To section 3-5

To step 6

Replace LVPS
assy.

6 Does the heater rod go on and off (light up and go out) after the

fuser has finished warming up? *1

7 (Check LVPS assy)

Is 4.2 VDC being supplied between J11-1PIN ↔ J11-2PIN?

•

Check before the output is stopped by the no-load status of the
LVPS assy (within 30 seconds of the power being turned on).

8 (Check heater rod ON signal) *1 *2

Is the voltage between P/J11-1PIN ↔ P/J11-2PIN 0 VDC
while the fuser is warming up, and 4.2 VDC after the fuser has
finished warming up?

*1: The warming-up status of the fuser is checked by checking the ON/OFF status of the heater rod and the operation of

the main motor.
*2: Check with the connector (P/J111) on the HVPS disconnected.

To section 3-6

To step 8

Replace LVPS
assy.

To step 7

Replace LVPS
assy.

Replace MCU
PCB.

– 86 –

2-6. Control Panel Displays the Error Message “CLOSE COVER”

TROUBLESHOOTING

Step Check

1 Is the front cover assy closed?

2 Check parts with different specifications for problems with

usage, defective installation, breakage, and deformation.

• Main parts to be checked:

(1) MCU PCB, (2) LVPS assy, (3) Link assy

3 (Check link assy)

With the link assy, check to see that the interlock switch on the
LVPS assy is turned on when the front cover assy is closed, and
turned off when the front cover assy is opened.

4 (Check interlock switch on LVPS assy)

Is the interlock switch functioning normally?

To step 2
To step 3

To step 4

Replace MCU
PCB.

2-7. Control Panel Displays the Error Message “PAPER JAMMING”

Step Check

1 Check parts with different specifications for problems with

usage, defective installation, breakage, deformation, and adhe­sion of foreign matter.

• Main parts to be checked:

(1) Inlet chute assy, (2) Regi. sensor, (3) Lower chute assy
(4) BTR assy, (5) Take away roll assy, (6) Exit sensor
(7) Exit actuator, (8) Fuser assy, (9) Pick up roll assy
(10) Pick up solenoid, (11) Bottom plate assy, (12) Link assy
(13) Trans. chute assy, (14) MCU PCB, (15) Drive assy
(16) EPX toner cartridge, (17) Paper cassette
(18) Feeder assy, (19) Optional feeder unit
(20) Top cover assy, (21) Harness assy sensor
(22) LVPS assy, (23) Front cover assy

To step 2

Measure

YES NO

Close the assy.
Replace or

reinstall.

Replace link assy.

To section 3-2

Measure

YES NO

Replace or
reinstall.

2 Does the problem occur when the power supply is turned on?

3 (Check main motor)

Is the main motor rotating normally?

4 (Check drive assy)

Are the various gears of the drive assy rotating normally?

• Rotate the main motor gears by hand to check them.

5 (Check exit roll assy rotation)

Are the exit roll assy of the fuser assy and the pinch roller of the
fuser cover assy rotating normally?

• Rotate the main motor gears by hand to check them.

6 (Check take away roll assy)

Is the take away roll assy rotating normally?
With the fuser assy and EPX toner cartridge removed, rotate the
main motor gears by hand to check them.

– 87 –

To step 22

To step 4

To step 5

To step 6

To step 7

To step 3

To section 3-17

Replace drive
assy.

Replace fuser
assy.

Replace take away
roll assy.

TROUBLESHOOTING

Step Check

7 (Check pinch roller of pick up roll assy)

Is the pinch roller of the pick up roll assy rotating normally in
conjunction with the rotation of the take away roll assy?

• With the fuser assy and EPX toner cartridge removed, rotate

the main motor gears by hand to check them.

8 Is paper being supplied from the front tray (multi-purpose

tray)?

9 (Check retard pad assy)

Is the retard pad assy of the lower chute assy coming in contact
with the pick up roll?

10 (Check paper cassette)

When the paper cassette is set in place, is the paper in the paper
cassette lifted upwards normally?

• Check visually from the rear side of the machine.

11 (Check no paper actuator) *1

Does the no paper actuator of the feeder PCB {feeder PCB aux}
move smoothly?

Measure

YES NO

To step 8

To step 9

To step 26

To step 11

To step 12

Replace pick up
roll assy.

To step 10

Replace lower
chute assy.

Replace the paper
cassette of the
pertinent tray.

Replace the no
paper actuator of
the pertinent tray.

12 (Check no paper sensor) *1

Is the no paper sensor of the feeder PCB {feeder PCB aux}
functioning normally?

13 (Check feed roll assy)

Does the feed roll assy feed paper properly from the paper
cassette?

14 (Check paper cassette)

Is the pinch roller of the paper cassette rotating smoothly?

• Remove the paper cassette and rotate the pinch roller by hand

to check it.

15 (Check drive assy)

Are the gears of the drive assy rotating normally in relation to
the gears of the EPX toner cartridge?

16 (Check link assy)

When the front cover assy is closed, does the link assy open the
drum shutter of the EPX toner cartridge?

• The protruding section on the left end of the EPX toner

cartridge drum shutter should be lifted up by the link assy
when it moves.

17 (Check trans. chute assy)

When the BTR assy is rotated by hand, does it turn smoothly?

• Do not touch any part of the BTR assy except the gears.

To step 13

To step 14

To step 15

To step 16

To step 17

To step 18

To section 3-10

Replace the feed
roll assy of the
pertinent tray.

Replace the paper
cassette of the
pertinent tray.

Replace drive
assy.

Replace link assy.

Replace trans.
chute assy.

– 88 –

TROUBLESHOOTING

Step Check

18 (Check eliminator of trans. chute assy)

Is there any dirt or grime clinging to the eliminator of the trans.
chute assy?

19 (Check eliminator of trans. chute assy)

Is there conductivity between the eliminator of the trans. chute
assy and the PTN (or the SG)?

20 (Check drive assy)

Are the gears of the drive assy rotating normally in relation to
the gear idler of the fuser assy?

• Rotate the main motor gears by hand to check them.

21 (Check rotation of heat roll/pressure roll)

Are the heat roll/pressure roll of the fuser assy rotating nor­mally?

• Rotate the main motor gears by hand to check them.

22 Is there any paper or other material in the exit actuator section?

Measure

YES NO

To step 19

To step 20

To step 21

To step 22

To step 23

Replace trans.
chute assy or
cleaning.

Replace wire assy
eliminator.

Replace drive
assy.

Replace fuser
assy.

Remove the paper
or other material.

23 (Check exit actuator)

Does the exit actuator move smoothly away from the sensor
section of the exit sensor when paper is present, and then move
to block off the sensor section of the exit sensor when there is
no paper present?

24 (Check exit sensor)

Is the exit sensor functioning normally?

25 Is there any paper or other material in the regi. actuator section?

26 (Check regi. actuator)

Does the regi. actuator move smoothly away from the sensor
section of the regi. sensor when paper is present, and then move
to block off the sensor section of the regi. sensor when there is
no paper present?

27 (Check regi. sensor)

Is the regi. sensor functioning normally?

*1: This is noted for both Tray 1 (upper cassette feeder) and Tray 2 (lower cassette feeder). To distinguish Tray 1 from

Tray 2, items concerning Tray 2 are enclosed in brackets { }.

To step 24

To step 25

To step 26

To step 27

Replace MCU
PCB.

Replace fuser assy
or exit actuator.

To section 3-7

Remove the paper
or other material.

Replace inlet
chute assy.

To section 3-8

– 89 –

TROUBLESHOOTING

2-8. Control Panel Displays the Error Message “SET EP CARTRIDGE”

Step Check

1 Has the EPX toner cartridge been set in position?

2 Check parts with different specifications for problems with

usage, defective installation, breakage, deformation, and adhe­sion of foreign matter.

• Main parts to be checked:

(1) CRU sensor PCB, (2) MCU PCB, (3) CRU sensor assy
(4) EPX toner cartridge, (5) Harness assy HVPS
(6) LVPS assy

3 (Check CRU switch of CRU sensor PCB)

Is the CRU switch of the CRU sensor functioning normally?

YES NO

To step 2

To step 3

Replace MCU
PCB.

Measure

Set
EPX toner cartridge.

Replace or
reinstall.

To section 3-12

2-9. Control Panel Displays the Error Message “LOAD ??? CASS.” or “LOAD ??? LCAS.”

Step Check

1 Has the cassette been set in place?

YES NO

To step 2

Measure

Set the cassette in
place.

2 Check parts with different specifications for problems with

usage, defective installation, breakage, deformation, and adhe­sion of foreign matter.

• Main parts to be checked:

(1) Feeder assy, (2) Optional feeder unit, (3) Feeder PCB
(4) Feeder PCB aux, (5) Size spring, (6) Harness assy out
(7) Harness assy 1tray, (8) Paper cassette, (9) MCU PCB
(10) LVPS assy

3 (Check paper cassette) *1 *2 *3

On the paper cassette, have the positions of the size springs (the
section which comes in contact with the paper cassette) changed,
so that the ON/OFF combinations of the four paper size switches
for the feeder PCB {feeder PCB aux} match the paper size?

• As the paper cassette is set in place, visually check the

clearance at the back of the machine.

4 (Check paper size switch data) *1 *2

Does the paper size switch data match the ON/OFF combina­tions of the four paper size switches for the feeder PCB {feeder
PCB aux}?

• Change the positions of the size springs (the section which

comes in contact with the paper cassette) to check the
alignment.

*1: This is noted for both Tray 1 (upper cassette feeder) and Tray 2 (lower cassette feeder). To distinguish Tray 1 from

Tray 2, items concerning Tray 2 are enclosed in brackets { }.

*2: For the correspondence between the paper sizes, the ON/OFF combinations of the paper size switches, and the paper

size switch data, please refer to Chapter 4, Section 5-2-4.

*3: The paper guides on the paper cassette should be lined up to match the paper being used.

– 90 –

To step 3

To step 4

Replace MCU
PCB.

Replace or
reinstall.

Replace paper
cassette.

To section 3-13

TROUBLESHOOTING

2-10. Control Panel Displays the Error Message “CASS: REFILL ???” or “LCAS: REFILL ???” or

“TRAY: REFILL ???”

Step Check

1 Is there paper in the pertinent paper supply section?

2 Check parts with different specifications for problems with

usage, defective installation, breakage, deformation, and adhe­sion of foreign matter.

• Main parts to be checked:

(1) Feeder assy, (2) Optional feeder unit, (3) Feeder PCB
(4) Feeder PCB aux, (5) No paper actuator
(6) Paper cassette, (7) MBF sensor, (8) MBF actuator
(9) Harness assy out, (10) Harness assy 1tray
(11) Harness assy sensor, (12) MCU PCB
(13) LVPS assy, (14) Multi-purpose tray

3 Is paper being supplied from the front tray (multi-purpose

tray)?

4 (Check MBF actuator)

Does the MBF actuator move smoothly?

5 (Check bottom plate assy)

When there is no paper in the front tray (multi-purpose tray),
does the MBF actuator move into the notch provided for it in
the bottom plate assy, and when there is paper present, does it
rest on the paper?

Measure

YES NO

To step 2

To step 3

To step 4

To step 5

To step 6

Add paper.

Replace or
reinstall.

To step 7

Replace MBF
actuator.

Replace MBF
sensor assy.

6 (Check MBF sensor)

Is the MBF sensor functioning normally?

7 (Check paper cassette)

When the paper cassette is set in place, is the paper in the paper
cassette lifted upwards normally?

• Check visually from the rear side of the machine.

8 (Check no paper actuator) *1

Does the no paper actuator of the feeder PCB {feeder PCB aux}
move smoothly?

9 (Check no paper sensor)

Is the no paper sensor of the feeder PCB {feeder PCB aux}
functioning normally?

*1: This is noted for both Tray 1 (upper cassette feeder) and Tray 2 (lower cassette feeder). To distinguish Tray 1 from

Tray 2, items concerning Tray 2 are enclosed in brackets { }.

Replace MCU
PCB.

To step 8

To step 9

Replace MCU
PCB.

To section 3-9

Replace the paper
cassette of the
pertinent tray.

Replace the no
paper actuator of
the pertinent tray.

To section 3-10

– 91 –

TROUBLESHOOTING

2-11. Control Panel Displays the Error Message “CASS: CHANGE ???” or “LCAS: CHANGE ???”

or “TRAY: CHANGE ???”

Step Check

1 Check parts with different specifications for problems with

usage, defective installation, breakage, and deformation.

• Main parts to be checked:

(1) Inlet chute assy, (2) Regi. sensor, (3) MCU PCB
(4) LVPS assy

2 Does the size of the paper set in the paper cassette match the

paper size specified on the control panel?

3 Is paper being supplied from the front tray (multi-purpose

tray)?

4 (Check regi. actuator)

Does the regi. actuator move smoothly away from the sensor
section of the regi. sensor when paper is present, and then move
to block off the sensor section of the regi. sensor when there is
no paper present?

5 (Check regi. sensor)

Is the regi. sensor functioning normally?

Measure

YES NO

To step 2

To step 3

To step 4

To step 5

Replace MCU
PCB.

Replace or
reinstall.

Match the paper
sizes.

To section 2-10

Replace inlet
chute assy.

To section 3-8

– 92 –

2-12. Abnormal Operation

TROUBLESHOOTING

No error message is displayed, regardless of whether
or not the front cover assy is opened.

No error message is displayed, regardless of whether
or not the EPX toner cartridge has been set in place.

No error message is displayed, regardless of whether
or not there is a paper cassette in the slot.

No error message is displayed, regardless of whether
or not there is any paper in the cassette.

Printing is carried out with a size other than the
specified size.

Power is not supplied even though the power supply
switch is turned on.
(No LCD display appears and the fuser does not
begin warming up.)

Abnormal operation

There is a problem with the LCD display.

To Section 2-6

To Section 2-8

To Section 2-9

To Section 2-10

To Section 2-11

To Section 2-12-1

Section 3 Level 2 FIT

To Section 2-12-2

The LED does not display anything.

The key switches do not function when they are
turned on.

There is a problem with the printing operation.

The drive assy does not operate.

The fan does not rotate.

To Section 2-12-3

To Section 2-12-4

To Section 2-12-5

To Section 2-12-6

To Section 2-12-7

– 93 –

TROUBLESHOOTING

2-12-1. Power is not Supplied

Step Check

1 Check parts with different specifications for problems with

usage, defective installation, breakage, and deformation.

• Main parts to be checked:

(1) LVPS assy, (2) MCU PCB, (3) Feeder assy
(4) Optional feeder unit, (5) HVPS, (6) Fan, (7) Drive assy
(8) Pick up solenoid, (9) Console assy, (10) ROS assy

2 (Check LVPS assy)

Are the voltages as follows?
24VDC between J11-10PIN ↔ J11-2PIN, J11-11PIN ↔
J11-2PIN, J11-12PIN ↔ J11-2PIN
5 VDC between J11-5PIN ↔ J11-2PIN, J11-6PIN ↔
J11-2PIN

• Disconnect one of the connectors (P/J11) from the MCU

PCB, and after about 5 minutes, turn on the power and check
the voltages.
Check before the output is stopped by the no-load status of the
LVPS assy (within 30 seconds of the power being turned on).

3 Does the fan rotate when the power is turned on?

Measure

YES NO

To step 2

To step 3

Replace MCU
PCB.

Replace or
reinstall.

Replace LVPS
assy.

To step 4

4 (Check main logic board) *1

Disconnect connector (P/J5) and wait 2-3 minutes. Then turn
on the power and check to see if a display appears on the LCD
and if the fan rotates.

5 (Check HVPS) *2

Disconnect connector (P/J111) from the HVPS. Then turn on
the power and see if a display appears on the LCD and if the fan
rotates.

6 (Check fan) *2

Disconnect connector (P/J18) from the MCU PCB. Then turn
on the power and see if a display appears on the LCD and if the
fuser begins to warm up.

7 (Check drive assy) *2

Disconnect connector (P/J14) from the MCU PCB. Then turn
on the power and see if a display appears on the LCD and if the
fan rotates.

8 (Check pick up solenoid) *2

Disconnect connector (P/J17) from the MCU PCB. Then turn
on the power and see if a display appears on the LCD and if the
fan rotates.

Check main logic
board.

Replace HVPS.

Replace fan.

Replace drive
assy.

Replace pick up
solenoid.

To step 5

To step 6
(check all of the
following steps
with the connec­tor disconnected
from the HVPS)

To step 7

To step 8

To step 9

– 94 –

TROUBLESHOOTING

Step Check

9 (Check ROS assy) *2

Disconnect connector (P/J12) from the MCU PCB. Then turn
on the power and see if a display appears on the LCD and if the
fan rotates.

10 (Check cassette feed section) *1 *2

Disconnect connector (P/J13) from the MCU PCB. Then wait
2-3 minutes and turn on the power. See if a display appears on
the LCD and if the fan rotates.

11 (Check Tray 2) *1 *2

Disconnect the optional feeder unit. Then wait 2-3 minutes and
turn on the power. See if a display appears on the LCD and if
the fan rotates.

12 (Check feed solenoid of Tray 2) *2

Check for conductivity between J201-1PIN ↔ J201-2PIN at
0Ω on Tray 2.

13 (Check turn solenoid of Tray 2) *1

Check for conductivity between J202-1PIN ↔ J202-2PIN at
0Ω on Tray 2.

Measure

YES NO

Replace ROS

assy.

To step 11

To step 12

Replace the feed

solenoid of Tray

2.

Replace the turn

solenoid of Tray

2.

To step 10

To step 16

To step 14

To step 13

Replace feeder
PCB aux.

14 (Check feed solenoid of Tray 1) *2

Check for conductivity between J201-1PIN ↔ J201-2PIN at
0Ω on Tray 1.

15 (Check turn solenoid of Tray 1) *1 *2

Check for conductivity between J202-1PIN ↔ J202-2PIN at
0Ω on Tray 1.

16 (Check ROS assy) *1

Disconnect connector (P/J19) from the MCU PCB. Then wait
2-3 minutes and turn on the power. See if a display appears on
the LCD and if the fan rotates.

17 (Check console assy) *1

Disconnect connector (P/J200) from the console assy. Then
wait 2-3 minutes and turn on the power. See if a display appears
on the LCD and if the fan rotates.

*1: Check the shorting of the 5 VDC power supply.
*2: Check the shorting of the 24 VDC power supply.

Replace the feed

solenoid of Tray

1.

Replace the turn

solenoid of Tray

1.

Replace ROS

assy.

Replace console

assy.

To step 15

Replace feeder
PCB.

To step 17

Replace main
logic board.

– 95 –

TROUBLESHOOTING

2-12-2. Faulty LCD Display

Step Check

1 Check parts with different specifications for problems with

usage, defective installation, breakage, and deformation.

• Main parts to be checked:

(1) MCU PCB, (2) Console assy, (3) LVPS assy

2 (Check main logic board)

Does a normal display appear when the main logic board is
removed?

3 (Check power supply of console assy LCD)

Is the voltage 5VDC between P/J200-A1PIN ↔ P/J200-B1PIN?

4 (Check replacement of MCU PCB)

Does the problem occur after the MCU PCB has been replaced
with a normal one?

2-12-3. Faulty LED Display

Step Check

Measure

YES NO

To step 2

Check main logic
board.

To step 4

Replace console
assy.

Measure

YES NO

Replace or
reinstall.

To step 3

To section 3-1

Processing
completed.

1 Check parts with different specifications for problems with

usage, defective installation, breakage, and deformation.

• Main parts to be checked:

(1) MCU PCB, (2) Console assy, (3) LVPS assy

2 (Check power supply of console assy LED) *1

Is the voltage 5 VDC between P/J200-A1PIN ↔ P/J200-B1PIN?

3 (Check LED on console assy)

When the power supply is turned on, does the LED light up?

4 (Check LED ON signal) *1 *2

When the power supply is turned on, is 0 VDC supplied
between the following?
P/J200-A8PIN ↔ P/J200-B1PIN
P/J200-A9PIN ↔ P/J200-B1PIN
P/J200-A10PIN ↔ P/J200-B1PIN
P/J200-B9PIN ↔ P/J200-B1PIN
P/J200-B10PIN ↔ P/J200-B1PIN

*1: Check with the connector (P/J111) disconnected from the HVPS.
*2: The LEDs corresponding to the various pins of P/J200 are as follows:

P/J200-A8PIN → LED (1)
P/J200-A9PIN → LED (2)
P/J200-A10PIN → LED (3)
P/J200-B9PIN → LED (4)
P/J200-B10PIN → LED (5)

To step 2

To step 3

Replace MCU
PCB.

Replace console
assy.

Replace or
reinstall.

To section 3-1

To step 4

Replace MCU
PCB.

– 96 –