Xerox Phaser 3120, Phaser 3130 Service Manual

SERVICE

LASER PRINTER

Phaser 3120
Phaser 3130

Manual

LASER PRINTER CONTENTS

1. Precautions

2. Specifications

3. Disassembly and Reassembly

4. Troubleshooting

5. Exploded Views and Parts List

6. Block Diagram

7. Connection Diagram

8. Schematic Diagram

1

1

1-1

Precautions

Service Manual

1. Precautions

The cautions in the below are items needed to keep in mind when maintaining and servicing.
Please read carefully and keep the contents in mind to prevent accidents while servicing and to prevent
that the machine gets damage.

1.1 Warning for safety.

(1) Request the service by qualified service person.

The service for this machine must be performed by a service person who took the additional education of
this field.
It is dangerous if unqualified service person or user tries to fix the machine.

(2) Do not rebuild it discretionary.

Do not attach or change pats discretionary. Do not dissemble, fix, and rebuilt it. If do, printer will abnormally
work and electric shock or a fire can be occurred.

(3) Laser Safety Statement

The Printer is certified in the U.S. to conform to the requirements of DHHS 21 CFR, chapter 1 Subchapter J
for Class 1(1) laser products, and elsewhere, is certified as a Class I laser product conforming to the
requirements of IEC 825.
Class I laser products are not considered to be hazardous. The laser system and printer are designed so
there is never any human access to laser radiation above a Class I level during normal operation, user
maintenance, or prescribed service condition.

Warning >> Never operate or service the printer with the protective cover removed from Laser/Scanner assembly. The reflected

beam, although invisible, can damage your eyes. When using this product, these basic safety precautions should
always be followed to reduce risk of fire, electric shock, and injury to persons.

CAUTION - INVISIBLE LASER RADIATION

WHEN THIS COVER OPEN.
DO NOT OPEN THIS COVER.

VORSICHT - UNSICHTBARE LASERSTRAHLUNG,

WENN ABDECKUNG GE FFNET .
NICHT DEM STRAHL AUSSETZEN.

ATTENTION - RAYONNEMENT LASER INVISIBLE EN CAS

D OUVERTURE. EXPOSITION DANGEREUSE
AU FAISCEAU.

ATTENZIONE - RADIAZIONE LASER INVISIBILE IN CASO DI

APERTURA. EVITARE LESPOSIZIONE AL
FASCIO.

PRECAUCION - RADIACION LASER IVISIBLE CUANDO SE ABRE.

EVITAR EXPONERSE AL RAYO.

ADVARSEL. - USYNLIG LASERSTR LNING VED BNING, N R

SIKKERHEDSBRYDERE ER UDE AF FUNKTION.
UNDG UDSAETTELSE FOR STRLNING.

ADVARSEL. - USYNLIG LASERSTR LNING NR DEKSEL

PNES. STIRR IKKE INN I STR LEN.

UNNG EKSPONERING FOR STRLEN.

VARNING - OSYNLIG LASERSTR LNING NR DENNA DEL

R PPNAD OCH SPRREN R URKOPPLAD.

BETRAKTA EJ STR LEN. STRLEN R FARLIG.

VARO! - AVATTAESSA JA SUOJALUKITUS OHITETTAESSA

OLET ALTTIINA N KYM TTM LLE LASER­S TEILYLLE L KATSO S TEESEEN.

1-2

Precautions

Service Manual

1.2 Caution for safety

1.2.1 Precaution related noxious material

The toner in a printer cartridge contains a chemical material, which might harm human body if it is swallowed.
Please keep children out of the toner cartridge.

1.2.2 Precaution related electric shock or fire

It is possible to get electric shock or burn by fire if you don't fallow the instructions of the manual.

(1) Use exact voltage. Please do use an exact voltage and wall socket. If not, a fire or an electric leakage can

be caused.

(2) Use authorized power code. Do use the power code supplied with PRINTER. Afire can be occurred when

over current flows in the power code.
(3) Do not insert many codes in an outlet. If do, a fire can be occurred due to flow over current in an outlet.
(4) Do not put water or extraneous matter in the PRINTER. Please do not put water, other liquid, pin, clip, etc.

It can cause a fire, electric shock, or malfunction. If it is happened, turn off the power and remove the

power plug from outlet immediately.
(5) Do not touch the power plug with wet hand. When servicing, do remove the power plug from outlet. And

do not insert or take off it with wet hand. Electric shock can be occurred.
(6) Caution when inserting or taking off the power plug. The power plug has to be inserted completely. If not,

a fire can be caused due to poor contact. When taking off the power plug, do grip the plug and take it off.

If grip the line and pull over, it could be damaged. A fire or electric shock could cause.
(7) Management of power code. Do not bend, twist, or bind it and place other materials on it. Also, do not fix

it with staples. If the power code gets damage, a fire or electric shock can be caused. Adamaged power

code must be replaced immediately . Do not repair the damaged part and reuse it. Arepaired part with plas-

tic tape can be occurred a fire or electric shock. Do not spread chemicals on the power code. Do not

spread insecticide on the power code. Afire or electric shock can be occurred due to thinner(weak) cover

of the power code.
(8) Check whether the power outlet and the power plug are damaged, pressed, chopped, or blazing fire or

not. When such inferiorities are found, repair it immediately. Do not make it pressed or chopped when

moving the machine.
(9) Caution when thundering, and being flash of lightening. It causes a fire or electric shock. Take the power

plug off when thundering. Do not touch cable and device when thundering and being flash of lightening.
(10) Do avoid the place where is moisture or has dust. Do not install the printer in where have lots of dust or

around humidifier. A fire can be occurred. A plug part need to clean well with dried fabric to remove dust.
If water drops are dripped on the place covered with dust, a fire can be occurred.

(11) Avoid direct sunlight. Do not install the printer near to window where directly contacts to the sunlight. If

the machine contacts sunlight long time, the machine cannot work properly because inner temperature
of the machine is getting higher. A fire can be caused.

(12) Turn off the power and take off the plug when a smoke, strange smell, or sound from the machine. If you

keep using it, a fire can be occurred.

(13) Do not insert steel or metal piece inside/outside of the machine. Do not put steel or metal piece into a

ventilator. An electric shock could be happened.

1-3

Precautions

Service Manual

1.2.3 Precaution related handling the machine.

If you ignore this information, you could get harm and machine could be damaged.

(1) Do not install it on the different levels, or slanted floor.

Please confirm whether it is balanced or not after installation. If it is unbalanced, an accident can be hap­pened due to the machine fell over.

(2) Be careful not to insert a finger or hair in the rotating unit.

Be careful not to insert a finger of hair in the rotating unit (motor, fan, paper feeding part, etc) while the
machine is operating. Once it happens, you could harm.

(3) Do not place a pot contains water/chemical or small metals. If those are got into the inner side of machine,

a fire or electric shock can be occurred.

(4) Do not install it in where lots of moisture or dust exists or where raindrop reaches. Afire or electric shock

can be caused.

(5) Do not place a candlelight, burning cigarette, and etc. on the machine. Do not install it near to heater. A

fire can be occurred.

1.2.4 Precaution when assembly/disassembly

When replace parts, do it very carefully. Do memorize the location of each cable before replace parts for
reconnecting it afterwards. Do memorize. Please perform the below before replace or disassembly the parts.

(1) Check the contents stored in the memory. All the information will be erased after replace main board. The

information needed to keep has to be written down.
(2) Before servicing or replacing electric parts, take off a plug.
(3) Take off printer cables and power code connected to printer.
(4) Do use formal parts and same standardized goods when replacing parts.Must check the product name,

part code, rated voltage, rated current, operating temperature, etc.
(5) Do not give an over-force when release or tighten up the plastic parts.
(6) Be careful not to drop the small parts such as screws in the printer.
(7) Be careful not to change the location of small parts such as screws when assembling and disassembling.
(8) Do remove dust or foreign matters completely to prevent fire of tracking, short, or etc.
(9) After finished repair, check the assembling state whether it is same as before the repair or not.

1-4

Precautions

Service Manual

1.3 ESD Precautions

Certain semiconductor devices can be easily damaged by static electricity. Such components are commonly
called “Electrostatically Sensitive (ES) Devices”, or ESDs. Examples of typical ESDs are: integrated circuits,
some field effect transistors, and semiconductor “chip” components.
The techniques outlined below should be followed to help reduce the incidence of component damage caused
by static electricity.

Caution >>Be sure no power is applied to the chassis or circuit, and observe all other safety precautions.

1. Immediately before handling a semiconductor component or semiconductor-equipped assembly, drain off
any electrostatic charge on your body by touching a known earth ground. Alternatively, employ a commer­cially available wrist strap device, which should be removed for your personal safety reasons prior to apply­ing power to the unit under test.

2. After removing an electrical assembly equipped with ESDs, place the assembly on a conductive surface,
such as aluminum or copper foil, or conductive foam, to prevent electrostatic charge buildup in the vicinity
of the assembly.

3. Use only a grounded tip soldering iron to solder or desolder ESDs.

4. Use only an “anti-static” solder removal device. Some solder removal devices not classified as “anti-static”
can generate electrical charges sufficient to damage ESDs.

5. Do not use Freon-propelled chemicals. When sprayed, these can generate electrical charges sufficient to
damage ESDs.

6. Do not remove a replacement ESD from its protective packaging until immediately before installing it. Most
replacement ESDs are packaged with all leads shorted together by conductive foam, aluminum foil, or a
comparable conductive material.

7. Immediately before removing the protective shorting material from the leads of a replacement ESD, touch
the protective material to the chassis or circuit assembly into which the device will be installed.

8. Maintain continuous electrical contact between the ESD and the assembly into which it will be installed,
until completely plugged or soldered into the circuit.

9. Minimize bodily motions when handling unpackaged replacement ESDs. Normal motions, such as the
brushing together of clothing fabric and lifting one’s foot from a carpeted floor, can generate static electric­ity sufficient to damage an ESD.

1-5

Precautions

Service Manual

1.4 Tool for Troubleshooting

The following tools are recommended for safe and smooth troubleshooting described in this service manual.

DCU(Diagnostic Control Unit)

Standard : Test equipment to diagnose the Laser
printer supplied by Samsung Electronics.

1

Driver

Standard : "-" type, "+" type (M3 long, M3 short, M2 long,

M2 short).

4

Cotton Swab

Standard : For general home use, for medical ser-vice

6

Software(Driver) installation CD ROM

8

Cleaning Equipments a IPA(Isopropyl
Alcohol)dry cloth or a soft stuff neutral
detergent

7

Pinset

Standard : For general home use, small type.

5

DVM(Digital Volt Meter)

Standard : Indicates more than 3 digits.

2

Electronic Scale

Standard : Equipment to check the weight of con­sumables(toner cartridge) supplied by Samsung
Electronics. (The gram unit can be measured.)

3

Mind your hands not to be touched when you
disassemble and reassemble PBAASS'Y, such
as the main board, SMPS, HVPS.

2

2

2-1

Specifications

Service Manual

2. Specifications

2.1 General Specifications

ITEM DESCRIPTION

Print Technology Non-impact Electro-photograpic Printing
Developing system Non-Magnetic, Mono-Component Developing System
Print Speed

(1)

16 PPM : A4 size , 5% Character pattern
17 PPM : Letter size , 5% Character pattern

Resolution Phaser 3120 : True 600 X 600 DPI

Phaser 3130 : 1200 X 600 DPI
Source of Light Laser diode (LSU : Laser Scanner Unit)
Warm-Up Time Power-on boot : 30 seconds or less
First Print Out Time Less than 1 1 seconds (Ready to 1st page out)
Media Size 75 X 125 (3” X 5”) mm to 216 X 356 (8.5” X 14”)mm
Media Thickness 16 ~ 24 lb
Dimension(W X D X H) 348 X 355 X 193mm / 13.7 X 14 X 7.6 inch
Weight Net : 7 Kg /15.4 lb

Gross : 9.5 Kg (Max.)
Acoustic Noise

(1)

Stand by : Less than 35 dB

Printing: Less than 50 dB
Machine Life 120,000 Sheets
Periodic Replacing Parts

(2)

Pick Up Roller : 60,000 Sheets

Feed Roller : 60,000 Sheets

Transfer Roller: 60,000 Sheets

Fuser Assembly : 60,000 Sheets

(1)

For measuring the printing speed, count the papers which outputted within one minute from when the
second page starts to be printed. (A4, 5% character pattern standard)

(2)

The life span of the consumption parts can be checked by printing the demo page or the system list.
(Refer to the 6.3 Receive the service information)

2-2

Specifications

Service Manual

2.3 Electrical Specification

2.2 Controller Specification

ITEM

DESCRIPTION

Phaser 3120 Phaser 3130

Processor(CPU) Samsung Jupiter4 90MHz Samsung SPGPm 166MHz
OS Compatibility

(1)

Win 98x/NT4.0/ME/2000/XP,
Various Linux OS,Mac(Mac OS 8.6 ↑)

Memory FLASH ROM(PROGRAM) : 0.5MB flash

RAM : 8 MB RAM : 32 MB

EEPROM(NVRAM) : 512byte
Emulation SPL(Samsung Printer Language) PCL6, IBMProPrinter, EPSON
Interface USB 1.1 USB

- USB 2.0

- 12 Mbps 1 port

Parallel : IEEE 1284

- Modes supported :
Compatible,Nibble,Byte,ECP
External Network Adaptor(Optional)

Interface switching Automatic
Interface time-out 5min(Max.)
Font Windows Font 45 Scalable, 1 Bitmap

ITEM DESCRIPTION

Input Voltage Nominal input voltage 200-240 VAC / 100~127VAC

Input voltage range 189-264 VAC/ 90~132VAC
Nominal frequency 50/60 Hz
Frequency tolerance +3Hz

Power Consumption Printing : 280W Avg or less Power Save : 10W Avg or less

2.4 Environmental Range

ITEM OPERA TING STORAGE

Temperature 10~32

o

C(50-90 oF) -20~40 oC (-4~104 oF)

Humidity 20~80%RH 10~80%RH

(1) The SPL series model is USB exclusive use, so it supports the environment beyond the WIN 98.

2-3

Specifications

Service Manual

• Input capacity

Cassette: 250 sheets
Manual : 1 sheet

• Output capacity

Face Down : 50 sheets(20lb)
Face Up : 1 sheet(OHP, Lavbel, Cut Sheet, Envelope)

2-Paper Handling Specifications

Please refer to "Paper Specifications" on user guide

• Input Paper Size

2.5 TONER Cartridge (Developer)

ITEM DESCRIPTION REMARK

Life span 3,000 sheets IDC 5% pattern
Developing Non-magnetic Mono Conponent Contact Developing
Charging Conductive Roller Charging
Toner checking sensor Not Available
Ozone 0.1PPM or less 8 hours
Style Single cartridge

P APER DIMENSIONS WEIGHT

A4 210 X 297 mm 60 to 90 g/m2 bond(16 to 24 lb)
Letter 216 X 279(8.5 X 11")
Legal(Legal14") 216 X 356(8.5 X14")
JIS B5 182 X257mm (7.2 X 10")
Folio(Legal13") 216 X 330mm (8.5 X 13")

Minimum size (Custom) 76 X 127mm (3 X 5") 60 to 163 g/m2bond(16 to 43 lb)
Maximum size (Custom) 216 X 356mm (8.5 X 14")
Transparency(OHP) Same minimum and maximum Thickness:
Label paper sizes as listed above 0.10 X 0.14 mm (0.0039 X 0.0055")

Envelopes Up to 90 g/m2 bond(16 to 24 lb)

2-4

Specifications

Service Manual

3

3

3-1

Disassembly and Reassembly

Service Manual

3. Disassembly and Reassembly

3.1 General Precautions on Disassembly

When you disassemble and reassemble compo­nents, you must use extreme caution. The close
proximity of cables to moving parts makes proper
routing a must.
If components are removed, any cables disturbed
by the procedure must be restored as close as
possible to their original positions. Before remov­ing any component from the machine, note the
cable routing that will be affected.

Whenever servicing the machine, you
must perform as follows:

1. Check to verify that documents are not stored
in memory.

2. Be sure to remove the toner cartridge before
you disassemble parts.

3. Unplug the power cord.

4. Use a flat and clean surface.

5. Replace only with authorized components.

6. Do not force plastic-material components.

7. Make sure all components are in their proper
position.

Releasing Plastic Latches

Many of the parts are held in place with plastic
latches. The latches break easily; release them
carefully.
To remove such parts, press the hook end of the
latch away from the part to which it is latched.

3-2

Disassembly and Reassembly

Service Manual

1. Pull the Cassette out of the printer.

2. Remove the Front Cover in the direction of
arrow.

3. Remove four screws.

4. Unlatch the front ends of the Top Cover.

5. Remove the Top Cover in the direction of arrow.

6. Remove the Rear Cover from the Top Cover.

Cassette

Top Cover

Rear Cover

Front Cover

3.2 Top Cover

3-3

Disassembly and Reassembly

Service Manual

1. Before you remove the Fuser, you should
remove:

- Top Cover(see page 3-2)

2. Unplug two connectors(Block) from the boards,
then remove four screws.

3. Remove two screws and take the Thermostat
out of the Fuser.

4. Remove two screws and take the Halogen
Lamp out of the Heat Roller.

5. Remove one screw and take the Idle Gear out.

6. Remove four screws and divide the Fuser into
two parts

7. Remove the Thermister from the Fuser Cover.

Idle Gear

Fuser Cover

Fuser Ass'y

Thermostat

Halogen Lamp

Heat Roller

3.3 Fuser

Thermister

3-4

Disassembly and Reassembly

Service Manual

1. Before you remove the Fuser, you should
remove:

- Top Cover(see page 3-2)

2.Remove the Exit Gear, Bearing and Exit Roller.

Exit Gear

Bearing

Exit Roller

1

2

3.4 Exit Roller

3.5 LSU

1. Before you remove the Fuser, you should
remove:

- Top Cover(see page 3-2)

2. Remove two screws and unplug one connector
from the Frame.

3. Remove the LED PBAAss’y as shown below.

4. Unplug two connector from the LSU

5. Unplug four screws and take the LSU out.

LSU

LED PBA Cover

3-5

Disassembly and Reassembly

Service Manual

1. Before you remove the Fuser, you should

remove:

- Top Cover(see page 3-2)

2. Unplug the connector from the SMPS and

remove the one screw. Then take out the Fan.

DC Fan

3.6 Fan

3.7 Driver Ass’y

1. Before you remove the Fuser, you should

remove:

- Top Cover(see page 3-2)

2. Remove the six screws from the Drive Ass’y.

3. Unplug one connector from the Driver Ass’y

Drive Ass'y

3-6

Disassembly and Reassembly

Service Manual

1. Before you remove the Fuser, you should
remove:

- Top Cover(see page 3-2)

- Fuser Connector(see page 3-3)

2. Remove the fourteen screws securing from the
Engine Shield Ass’y and unplug the all connec­tors. Then take the Engine Shield Ass’y.

Engine Shield
Ass'y

3.8 Engine Shield Ass’y

3.9 Main PBA

1. Before you remove the Fuser, you should
remove:

- Top Cover(see page 3-2)

- Engine Shield Ass’y(see page 3-6)

2. Unplug one connector and remove five screws
from the Main PBA. Then lift the Main PBA out,
as shown below.

Main PBA

3-7

Disassembly and Reassembly

Service Manual

3.10 SMPS

1. Before you remove the Fuser, you should

remove:

- Top Cover(see page 3-2)

- Engine Shield Ass’y(see page 3-6)

2. Unplug one connector and remove three screws

then take the Inlet Ass’y out.

3. Remove one screw and unplug one connector
from the Main PBA.

4. Remove three screws and take The SMPS out.

Inlet Bracket

SMPS

3-8

Disassembly and Reassembly

Service Manual

3.11 Transfer Roller

1. Before you remove the Fuser, you should
remove:

- Top Cover(see page 3-2)

- LSU(see page 3-4)

2. Remove three screws and take the Transfer
Earth out.

3. Unplug the PTL Holder Connector, then remove
the PTL Holder and PTL Lens, as shown below.

4. Unlatch the Bush and remove it. Then lift the
Transfer Roller out, as shown below.

Transfer
Earth

PTL
Holder

PTL
Lens

Transfer
Roller

Bush

5-11

Disassembly and Reassembly

Service Manual

3.12 Feed Roller

1. Before you remove the Fuser, you should
remove:

- Top Cover(see page 5-2)

- Drive Ass’y(see page 5-7)

2. Remove two screws from the Guide Paper and
take it out.

3. Pull up the Feed Idle Bush and Feed Idle Shaft,
as shown below.

4. Remove three screws from the Feed Bracket
and take it out.

5. Remove the Idle Gear and Feed Gear2.

6. Remove the Feed Gear 1 Ass’y, as shown
below.

7. Remove the Feed Roller and Feed Roller 1, as
shown below.

Guide paper

Bush

Feed Idle
Shaft

Feed Bracket

Feed Gear2

Idle Gear

Feed Gear1
Ass'y

Feed Roller1

Feed Roller

3-10

Disassembly and Reassembly

Service Manual

1. Before you remove the Fuser, you should
remove:

- Top Cover(see page 3-2)

- Drive Ass’y(see page 3-5)

- Engine Shield Ass’y(see page 3-6)

2. Remove the Pick up Gear Ass’y, as shown
below.

3. Remove the Pick up Ass’y, as shown below.

Pick up Gear
Ass'y

Pick up Ass'y

1

2

Bush

3.13 Pick Up Roller

3.14 Solenoid

1. Before you remove the Fuser, you should
remove:

- Top Cover(see page 3-2)

- Drive Ass’y(see page 3-5)

- Engine Shield Ass’y(see page 3-6)

- Pick Up Roller(see page 3-10)

2. Remove two screw then remove The Manual
Solenoid and Pick Up Solenoid.

(Pick up)
Solenoid

(Manual)
Solenoid

4-1

TROUBLESHOOTING

Service Manual

4

4

4. Troubleshooting

4.1 How to use DCU

4.1.1 DCU Setup

You can examine the malfunction of the printer. To perform DCU, open the front discharge cover and leave
the connect the harness wire(10 pin/4 pin) to the CN10(4 pin) of the Main control board.

ML SERIES DIAGNOSTIC CONTROL UNIT

04
05
07
08
09
10

DEV 300
LSU READY
PAPER EMPTY

COVER OPEN
COER HEATING

DEV 350
LSU MT & LD
PAPER WIDTH
EXIT SENSOR

PRINTING TEMP

DEV 350
LSU MOTOR
NEW CRU
FEED SENSOR

READY HEAT

ON

OFF

STATUS

SELF
TEST

DIAGNOSTIC

DIAGNOSTIC CODE

00
01
02
03
04
05
06
07
08
09
10
11

12
13

14

61

00
01
02
03
04

20
30
40
50

69



60
62
68
64
70
71
72
73
95

MAIN MOTOR OPERATING SYSTEM
MAIN HIGH-VOLTAGE ON
TRNSFER HIGH-VOLTAGE (-)ON
THV(+) REFERANCE VOLTAGE
DEV/SUPPLY HIGH-VOLTAGE ON/PTL ON
LSU OPERATING SYSTEM
PICKUP CLUTCH ON
PEEMPTY/PWITH/NEW CRU TEST
FEED & EXIT SENSOR TEST
COVER OPEN SENSOR TEST
FUSER TEST
HOT BURN TEST

CLEAN MODE PRINT
THV(+)TRIGGER, ALL HV & FAN ON
THV(+) REFERENCE ON

ERROR STATUS CODE

STATUS CODE

WARM UP

READY (REGAL)
READY (LETTER)
READY (A4)
READY (EXECUTIVE)
READY (B5)

PRINT START
FEED SENSOR ON
FEED SENSOR OFF
PAPER OUT

SLEEP MODE

OPEN FUSER ERROR
LOW TEMPERATURE ERROR
OVER HEATING ERROR
COVER OPEN ERROR
NO PAPERR
PAPER JAM 0
PAPER JAM 1
PAPER JAM 2
LSU NOT READY

DIAGNOSTIC
MODE

DOWN

UP ENTER

SHIFT STOP

TO ENTER DIAGNOSTIC MODE, PUSH THREE BUTTONS SIMUL ANEOUSL
AND TURN THE PRINTER POWER ON.

4-2

TROUBLESHOOTING

Service Manual

4.1.2 Code

Connect DCU to the printer and turn the power on. It show 7 Segment FND on the panel and each code
tells the function of the printer.

1) Normal Code

While printing or warming up, it indicate the position of the paper

2) Error Code

When detecting the malfunction, the printing is stopped to indicate error code.

Code State Description

61 Warm up The printer is on, the cover is open or close.
00~05 Ready(kind of paper) The printer is ready, the paper is detected when the first paper is printed.

00: Legal ,01: Letter ,02: A4 ,03: EXEC ,04: B5 ,05: Folio, 06: A5/A6

20, 21, 22 Print Start The engine controller received the print order from the video controller.

20: 1st, 21: MP, 22: SCF
30 Feed Sensor On The paper is passing out of the Feed Sensor.
40 Feed Sensor off The paper has passed out of the Feed Sensor.
50 Paper Out The paper has passed out of Exit Sensor.
69 Sleep Mode The fuser power turned off to minimize the power consumption.

Code State Description

60, 62, 68 Fuser Error The error in the fuser occurred. There is a short circuit in the thermistor

and the thermostat while printing, Low Temperature Error occurs.

• 60: Open Fuser Error

• 62: Low Heat Error

• 68: Over Heat Error
64 Cover Open The Printer Cover is open.
65 CRU Error The Toner Cartridge not installed,
70 No Paper No paper in the paper cassette.
71 Paper Jam 0 The front part of paper is jammed between pickup unit and Feed sensor.
72 Paper Jam 1 The front part of paper is jammed between the Discharge sensor and

Feed sensor.

73 Paper Jam 2 The front part of paper is jammed just after passing through the discharge

sensor.
76 Out Bin Full The Out bin is filled with paper.
95 LSU Not Ready LSU Scanner Motor not ready or Hsync signal not output.

4-3

TROUBLESHOOTING

Service Manual

4.1.3 Self Diagnostic Mode

If Error code occurs due to malfunction of the printer, perform Self Diagnostic Mode to solve the problem.
The printer works only in the self-test mode to solve the malfunction problem.

To enter the self-test mode, turn the power on pressing the buttons of [Down], [Shift] and [Stop] at the same
time.
Release the button within 2 or 3 seconds if 78 shows in the DCU. If 00 shows in the DCU, press the button
[Up] or [Shift] to select the self+test , and press the button of [Enter] to operate. To stop, press the button of
[shift] and [Enter] together.

Code Description

00 Main Motor Operating System

Only the main motor is in operation.

01 Main High Voltage On(THV-)

-1400 voltage output by MHV terminal.

Caution : High voltage probe should be used.

02 Transfer High Voltage(-)On(THV-)

-1000 voltage output by MHV terminal.
Caution : High voltage probe should be used.

03 Transfer High Voltage (+)Reference on (THV +)

+800 voltage output by MHV terminal.

Caution : High voltage probe should be used.

04 DEV/supply High Voltage : DEV/Supply High Voltage Test.

The left one of the three LEDs in the self-test panel is on when DEV high voltage Supply
high voltage output by each HV terminal(-500V). Press the [Up] button to switch the volt­age. The middle and right one of the three LEDs are on and -650 voltage output by DEV
HV terminal.

Caution : High voltage probe should be used.

05 LSU Operating System

The scanning motor of LSU is in operation, the right LED of the three buttons on. Press
the [Up] button to Check LD. LD is functioning and the middle button is on. If the LD is
normal, all LEDs are on.

06 Pickup clutch on

The Solenoid in the printer is in operation. To stop the operation, Press the button [shift]
and [Enter] together.

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TROUBLESHOOTING

Service Manual

Code Description

07 Paper Empty Sensor Test :

If activate the Actuator of the PEMPTY Sensor, the left and right of the three LEDs are
on.

Paper Empty Sensor ON/OFF 1st LED ON/OFF

08 Feed & Exit Sensor Test

Test the Feed sensor and Discharge sensor in the same way as '07'.
Feed Sensor ON/OFF 2nd LED ON/OFF
Exit Sensor ON/OFF 3rd LED ON/OFF

09 Cover Open Sensor Test

Test the Cover Open Sensor in th same way as code '07’
Cover Open Sensor ON/OFF 1st LED ON/OFF

10 Fuser Test

If the [Enter] button pressed, the right LED is on and temperature of the fuser is up to
READY Mode. If the [Up] button pressed, the middle LED is on and temperature of the
fuser is up to Printing Mode.
If you press the button once more, the left LED is on and temperature of the fuser is up
to overheat Mode.

11 Hot Burn Test

If the [enter] button pressed, the printer is continuously printing without detection.
Turn the power off to stop operation.

12 Cleaning Mode Print Mode

Print the paper to clean the OPC Drum in the Cartridge.

13 THV(+) TRIGGER. ALL HV :

All high voltage output by each HV terminal and LSU and the fan is in operation. In this
mode, electronic resistance of transfer roller and high voltage is detected.

14 PTL Test :

Indicates the function of the PTL, same method of the code ‘07’.

15 Fan Test :

Indicates the function of the Fan, same method of the code ‘07’.

16 Manual Pickup Test :

Indicates the function of th Manual Pickup, same method of the code ‘07’.

17 Manual Sensor Test :

Indicates the function of the Manual Sensor, same method of the code ‘07’.

4-5

TROUBLESHOOTING

Service Manual

4.1.4 Self Test Button

If the Self-Test button pressed, vertical lines are printed.
Turn the power on while pressing this button, '89' shows in the DCU and the printer is warming up. After

warming-up the printer is in READY Mode, and '88' shows in the DCU. In this mode, without any detection,
the printer begins printing(trial printing and data from the PC). It is convenient to use this mode when the
engine malfunction is detected in the control board.

No. Function Enter Up/ Dow n Stop Remark

00

Mot or

Motor Run Motor Stop

01

MHV

Mhv On Mhv Off -1550V

02

THV(-)

Thv Negative On Thv Negative Off

03

THV(+)

Thv On Thv Off +1300V

04

DEV

Dev On

Supply DEV

Dev Of f

0:-630V 0:-430V

05

LSU

LSU Run

On Off Ready

LSU Stop

06

PickUp

Pickup On Pickup Off

07

PEmpty

Paper Empty

08

Sensor

Exi t Feed

09

Cover

Cover Open

10

Fuser

Fuser On Fuser Off

11

HotB urn

HotBurn O n

12

Clean Print

Clean Printing

13

Thv

Ref erence

low adequate high

14

PTL

PTL On PTL Off

15

FAN

Fan On Fan Off

16

Man ual
PickUp

Manual Pickup On Manual Pickup Off

17

Man ual
Sensor

Manual Sensor