Samsung ML-6040 Troubleshooting

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

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

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

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

(

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

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)

+ 12 hidden pages