Samsung ML-6040 Troubleshooting

Download

Page 1

Troubleshooting

4-1

4. Troubleshooting

4-1 DCU Control

In case of ML-6060,you can not use the DCU under ‘Diagnostic mode’

But, you can check set condition by status code

4-1-1 DCU Setup

1) Connect DCU to Controller Board Connector CN9 (4 pins)).

4-1-2 DCU Error Status Code

DCU error code will indicate malfunction area of the machine.

Display Error status

60 OPEN FUSER ERROR 62 LOW HEAT ERROR 68 OVER HEAT ERROR 64 COVER OPEN ERROR 70 NO PAPER or NO CASSETTE 71 PAPER JAM 0 72 PAPER JAM 1 73 PAPER JAM 2 95 LSU NOT READY

Page 2

4-1-3 Error Solution

Display Solution

60, 62, 68 1. Measure the resistance of the AC connector on the Fuser. Normal resistance is 2-4 ohms

for 110V, 6-8 ohms for 220V.

2. Check if the fuser lamp works properly.

3. Measure the resistance at Q7 on the engine board. If abnormal, replace U503,CN502,

70 1. Make sure that paper is loaded in the cassette.

2. Replace U555 sensor (photo interrupter).

3. Replace U7 on controller board.

71 1. Make sure that paper is loaded in the cassette.

2. Check for pick-up unit. If it is heavily worn, replace it with new one.

3. Replace U554 sensor.

4. Check if the feed clutch works properly.

5. If abnormal, replace the feed clutch or Q3 on the Engine board .

72, 73 1. Make sure that the paper being used meets the specification.

2. Check if there is a paper jam in the fuser.

3. Replace U554 on the engine board or exits ensor on the frame.

4. Check the fuser roller for any dirt. If dirty, clean the roller.

95 1. Check for CN11,CN6 on the Controller board.

2. Replace U5,OSC1 on the Engine board.

3. Replace LSU.

Troubleshooting

4-2

4-2 Abnormal Image Printing and Defective Roller

If abnormal image prints periodically, check the parts shown below.

No Roller Abnormal image period Kind of abnormal image

1 OPC Drum 95.6mm White spot/Black spot 2 Charge Roller 38.5mm Black spot 3 Supply Roller 45.3mm Horizontal density band 4 Develop Roller 47.1mm Horizontal density band 5 Transfer Roller 56.1mm Black side contamination/transfer fault 6 Heat Roller 69.3mm Black spot and fuser ghost 7 Pressure Roller 72.5mm Black side contamination

Page 3

Troubleshooting

4-3

Repair or replace the GND terminal.

Check the path between video controller, engine board and HVPS. Repair or replace the defective component or board.

The mirror in LSU might be misplaced so the light path to the OPC deviates ->Repair or replace LSU or remove any defective matters in the machine.

No image?

Is the OPC

terminal of machine

well-connected

to Frame?

Does the

video data line to

LSU transit to High/Low

when printing?

A on

Repair or replace he GND terminal

Is the

OPCshaft of CRU

well-connected to

GND terminal

YES

4-3 Print Quality

4-3-1 No Image

Notice

In the ML-6060 Series system, the Developing/Supplying bias is set to decrease by -50V increments when

the system load is over the specified value. Therefore, if you check the bias without the toner cartridge, the system load is recognized to be infinity and Developing/Supplying bias decreases by -50V increments. At the first warm-up after the printer is powered on and then off, the software does not have the data on system load, so the Developing/Supplying bias measures -500V/-650V, the basic voltage. And, from the second warm-up and on, the software has the data on system load, so the bias measures

-450V/-600V, which is less -50V than the basic voltage.

Without cartridge First Warm-up Second Warm-up Developing Bias -500V -450V Supplying Bias -650V -600v

Page 4

Troubleshooting

4-4

Transfer roller might be out of its location.

-> Locate the roller into its place. This could occurrs when the power of LSU is low or

the density is low due to the obstacles on the window

-> Replace LSU or clean the window.

Transfer

voltage OK? (on the

transfer roller

shaft)

Are the

connection terminal

and connection

correct?

Repair or replace terminal.

Sealing tape

is removed from the

cartridge?

Replace HVPS or repair defective component.

Is the connection

terminal OK?

Replace HVPS or repair defective component.

Repair or replace terminal.

Remove the tape.

Developing

and supplying

voltage are OK?

Does the counter indicate over the toner's guarranty

life?

Replace the toner cartridge.

YES

(

Normal

Without Cartridge

Developing -500V -450V

Supplying -650 -600V

(

Page 5

Troubleshooting

4-5

All black in

printing area?

Is the

Hsync/ signal received

in LSU?

Is Main high

Voltage supplied

from HVPS?

Does the

video data line to LSU

transit to High/Low when

printing?

Replace LSU.

Check the path among video controller, engine board, HVPS, LSU for the shortage or open. -> Repair or replace the boards.

Replace LSU.

Is C/R

well connected to

Main high voltage

terminal?

Repair orReplace HVPS.

Repair orReplace terminal.

YES

4-3-2 All Black

Page 6

Troubleshooting

4-6

White line

missing definitely?

Dirt of dust stuck onto the window of internal lens of LSU

-> Clean it or replace LSU. Preventive obstacles through

the path between OPC of developer and LSU prevent the path -> Remove the obstacles.

Dirt of dust stuck onto the external glass of LSU

-> Remove the obstacles.

Check if the

printout is still has the

same problem even right after

passed through the

transfer roller.

Toner material might be stuck to blade in the developer inside and it prevents toner supply -> Replace the developer.

Check both if the toner cartridge's counter is over its guaranty and amount of the toner material.

-> Replace the toner cartridge.

The ribs in fuser or toner on the roller may invoke the image problem. -> Replace the fuser cover or the defective part.

The image is originally black or the black part is far close to the top.

-> Use the pattern which has the image below bigger than 10mm from the top.

YES

4-3-3 Vertical White Line (Band)

Page 7

Troubleshooting

4-7

'Dark' selected

via RCP?

Change to

'Normal' and test.

Works

correctly with

-500V of developing Bias voltage?

Works

correctly after

replaced LSU?

Repair or replace the defective component.

The power of LSU is set high or internal problem.

-> Replace LSU or adjust volume.

Same at 'Normal'?

END

Toner over supply due to the adjustment fault of metering blade in developer.

-> Replace developer.

YES

(

Normal

Without Cartridge

Developing -500V -450V

Supplying -650 -600V

(

4-3-4 Dark Image

Page 8

Troubleshooting

4-8

Recommended

paper used?

Transfer,

charge and developing

voltage are OK?

Operating/

storage atmosphere is

too high temperature

/humidity?

Solve the problem under the recommended condition (10-32 degree Centigrade).

Dirt or

dust around the

charge roller?

Clean the charge roller or replace step-up device /terminal after check.

Work OK?

Internal blade or suppying part of the developer is defective.

-> Replace the toner cartridge.

Check terminals or contacts and 'Guide-Deve Spring' are misplaced.

-> Repair or replace transfer roller etc. Check if the LED of PTL in front of the transfer roller

is on when it presses the top cover switch on purpose.

-> If not, replace PTL.

Print 20 to 30 pages using the recommended paper.

Same problem

occurs?

- Adjust voltage or replace HVPS.

- Repair or replace after checking the terminals' contacts.

END

Replace the toner cartridge.

NO NO

YES

4-3-5 Background

Page 9

Troubleshooting

4-9

YES

Is it regular

interval of 95.6mm?

PTL lamp

works OK?

Transfer

voltage is set to

standard?

Is it regular

interval of 47.1mm?

Is it regular

interval of 56.1mm?

(as transfer roller

interval)

Developing

/suppying voltage

normal? (-500V/

-650V)

Check HVPS contacts and HVPS's selfoutput.

-> If failed, repair/replace HVPS.

Replace PTL assembly.

Irregularity of NIP between rollers in developer.

-> Replace developer.

- Repair or replace HVPS .

- Check and repair or replace the terminal contacts.

A specific part of the transfer roller has ruined or its resistance value is changed.

-> Replace transfer roller. Transfer roller cannot force

regularly due to the gears eccentricity of transfer roller.

-> Replace the defective component.

Transfer roller is well

-connected to or not.

-> Replace the defective component.

Bias voltage

is OK? (-500V)

Operating/storage

temperature is too low or

not recommended

paper used?

Adjust the Bias voltage or replace HVPS.

There may be a problem in toner layer control in toner cartridge.

-> Replace the developer.

Use the machine with recommended paper and at normal condition.

YES

Normal

Without Cartridge

Developing -500V -450V

Supplying -650 -600V

(

4-3-6 Ghost

Page 10

Troubleshooting

4-10

Is it regular

interval of 38.5mm?

Printing cleaning mode

-> If the same problem persists replace developer and C/R.

When taking

out the cartridge,

toner leaks?

Toner leaks and toner material dropped onto the paper. -> Replace the developer.

Bad image

removes by

scratching?

Check toner is stuck onto the P/R or H/R in fuser.

-> Clean it or replace.

The problem randomly occured due to the toner fallen. -> Clean the machine.

NO NO NO

YES

Is it regular

interval of 96mm?

OPC was damaged

-> Replace developer and C/R.

YES

4-3-7 Black Dot

Black band?

The black

band has regular

interval?

Black band

is far about 10mm from

white band?

Problem of internal contacts in OPC.

-> Replace developer.

The OPC is damaged under the direct sunlight for around 5 minutes. -> If the same problem persists in 10 hours, replace the developer.

This occurs when no Hsync/ at LSU.

-> Replace LSU.

95.6mm interval?

Heat roller is ruined.

-> Replace the roller.

The OPC is damaged due to the irregular transfer voltage of HVPS.

-> Repair OPC or the developer

-> If the same problem perststs repair/replace HVPS

Does it appear

at every 69.3mm at

specific place?

Problems of terminal contact, transfer voltage supplying, and transfer roller's due to the charge roller is ruined (38.5mm).

-> Repair/replace HVPS, developer.

NO NO

YES

4-3-8 Horizontal Band

Page 11

Troubleshooting

4-11

OK after

taking out and

rocking the toner

cartridge?

Check if printer mode is econo mode

-> select normal mode. It is over the guaranty

life of toner cartridge. (Check the counter and replace it.)

When gray pattern printing, irregular density

persists?

PTL lamp

works OK?

Any obstacles

on the PTL lamp?

Transfer/

charge/developing

voltage drops while

printing?

Defective agitator in the toner supplying part of developer.

->Replace the developer. Check if the 'guide deve

spring' works OK and repair/repalce.

Check high voltage output and repair/ replace terminals/HVPS.

Replace lamp.

Clean the window of PTL.

Bad images

aroung the no image

area?

Irregualrity of toner suppy from developer.

-> Replace developer.

Light distortion due to the mirror ruined or LSU's diffused reflection.

-> Replace LSU.

NO NO

YES

4-3-9 Irregular Density

Page 12

Troubleshooting

4-12

Is it regular

interval of 95.6mm?

Obstacles stuck on OPC's surface

-> Clean the OPC and machine or replace developer.

When putting in/out the developer, scratch is made.

-> Replace the developer.

Is it regular

interval of 47.1mm?

D/R in developing unit has the defect.

-> Replace the developer.

YES

4-3-10 White Spot

Recommended OHP film used?

Operating

atmosphere is too

high temperature/

humidity

Solve the problem under the recommended condition (10~32 degree centigrade)

Replace HVPS or repair defective component

Use the recommended film.

Transfer

voltage OK?

(on the teansfer roller

shaft)

Repair or replace the HVPS

NO NO

YES

Are the connection

terminal and

connection correct?

Repair or replace terminal

YES

'Transparency'

selected via RCP?

Select 'Transparency' mode.

YES

4-3-11 Trembling at the End When OHP Printing

Page 13

Troubleshooting

4-13

After printing

completed, any error

related fuser?

Both ends

of thermostat

open?

Replace thermostat and re-test.

Replace the contol component on engine board.

Check any contact problem in thermistor and repair.

The machine

placed under the

severe low tempera-

ture for a long

time?

Place the machine at normal temperature and re-test.

While printing,

the voltage of pin 60

of U17(CPU) on controller

board is 1.5V

~2.0V?

Thermistor's

contact is OK?

Open the top

cover. When black

printing, is the fuser NIP

width is 3.0-

3.5mm?

The paper used is too thick or contains too much cotton in it.

-> Re-test with the recommended paper.

Check if the hardness of P/R, and spring force is OK? (hardness: 24 degree, spring's force: 3 Kg)

Re-assemble

thermistor.

YES

4-3-12 Poor Fusing Grade

Page 14

Troubleshooting

4-14

'ENVELOPE'

selected via

RCP

Transfer voltage

is OK?

Are the

connection terminal and

connection correct?

Select 'ENVELOPE'mode via RCP

Replace or repair HVPS.

Repair orReplace HVPS.

Replace HVPS or repair defective component.

YES

4-3-13 Poor transfer and poor fusing when ENVELOPE printing

Page 15

Troubleshooting

4-15

4-4 Malfunction

Plug in the

power cord?

The power

voltage supplying is

the same as

rating?

The fan

revolves when

powered on?

LEDs blink once when

powered on?

The On-Line

key is being pressed

or shortage on

the panel

board?

Repair/replace the board.

Check the voltage first and plug the power cord.

Supply the power as the rating.

Connections

on board are OK?

Re-connect firmly and re-test.

The connection error between controller board and panel board or malfunction of boards.

-> Replace the boards.

Fuse of SMPS

is open?

Shortage

between 5V and

GND, or between

24V and

GND?

Replace the fuse.

Toner cartridge

is in the set?

Detect failure due to the board which detects top cover open or switch error.

-> Replace the board or switch.

Put in the cartridge.

Remove the shortage or replace the board.

NO NO

YES

4-4-1 No Power (LED Off)

Page 16

Troubleshooting

4-16

Less than 10ohm?

AC is being supplied?

The voltage

of pin #60 of U17

(CPU) on the controller

is about 2.0V when

printing?

END

Thermostat is open due to the heat etc.

-> Replace the thermostat.

Check the fusing control part and CN501on the engine board.

-> Replace the component or replace the engine board.

Measure the resistance at the both ends of AC line with covers open.

Remove the covers.

Re-assemble the top cover and close it.

Thermistor, connecting point or engine board defected. -> Repair/replace the component/board.

YES

4-4-2 Fuser Error

Page 17

Troubleshooting

4-17

Sounds the

solenoid on when starts

print?

Does the

paper move?

Does the

paper move more than

100mm?

The engine board and joint board defected.

-> Replace boards. The solenoid defected.

-> Replace it.

The pick-up unit is assembled wrong.

-> Re-assemble or replace the unit.

Feeder

sensor and paper

width detect sensor

are assembled

reverse?

Switch them.

The sensor and joint boards defected.

-> Repair/replace.

Too many

papers in the

feeder?

Paper guides

fit the paper width?

Paper end curled?

Does the

extender pulled out?

<Recommendation> Use the MPF for the thick paper such as envelope and cardstock.

Reduce the amount and re-test.

Take out the paper and re-insert.

Use the recommended and quality paper.

Pull out the extender.

YES

YES YES

4-4-3 Paper Jam (Mis-feeding)

Page 18

Troubleshooting

4-18

Paper

stopped before

the OPC?

Check the LSU and if it has the defect.

->Replace it.

Paper

stopped before

the fuser?

Severe skew

when feeding?

Adjust the paper guides to fit the paper width.

The force of springs pressing the developer is weak.

-> Check guide-DEVE.

The paper

came out through

between fuser and

developer?

Too thin

or sensitive paper to

static electricity?

Use the recommended paper.

Check guide transfer is grounded. Check the shutter prevents feeding.

Check the input path to the fuser (such as mis-assembly).

The

actuator of

paper exit sensor

works OK?

Check the actuator exists and its operation and around the engine board.

-> Replace.

Is the paper

rolled around the

presseure

roller?

Remove the fuser, remove the paper and replace the pressure roller, if necessary.

Feeds

multiple pages?

Reduce the amount and retest.

Check the roller and ribs of fuser are in place, and remove burrs, if any.

-> Remove the factors of jam.

NO NO NO

YES

4-4-4 Paper Jam (Jam 1)

Samsung ML-6040 Troubleshooting

Specifications and Main Features

Frequently Asked Questions

User Manual