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Alignment & Adjustments
6
6. Alignment and Adjustments
This chapter describes some of the main service procedures including: Using the DCU for diagnostics; Clearing paper jam and test patterns. Much of this chapter is also included in the user's guide.
6.1 How to use DCU
6.1.1 DCU Setup
You can use the DCU test jig as an aid to the diagnosis of printer problems. To connect the DCU to the printer remove the top cover and connect the harness wire CN6(ML-1520) on the Main control board.
ML SERIES DIAGNOSTIC CONTROL UNIT
04 DEV 300 05 LSU READY 07 PAPER EMPTY 08 09 COVER OPEN 10 COER HEATING PRINTING TEMP READY HEAT DEV 350 LSU MT & LD PAPER WIDTH EXIT SENSOR DEV 350 LSU MOTOR NEW CRU FEED SENSOR
SELF TEST
STATUS DIAGNOSTIC
ON
DIAGNOSTIC CODE
00 01 02 03 04 05 06 07 08 09 10 11 12 13 14
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
OFF
NORMAL STATUS CODE
61
WARM UP
00 01 02 03 04 20 30 40 50 69
READY READY READY READY READY
(REGAL) (LETTER) (A4) (EXECUTIVE) (B5)
PRINT START FEED SENSOR ON FEED SENSOR OFF PAPER OUT SLEEP MODE
ERROR STATUS CODE
60 62 68 64 70 71 72 73 95
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
SHIFT
STOP ENTER
TO ENTER DIAGNOSTIC MODE, PUSH THREE BUTTONS SIMUL ANEOUSL AND TURN THE PRINTER POWER ON. SEC CODE : ML+5000 KC/XRX
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Alignment & Adjustments
6.1.2 Code
The DCU can be used in 2 modes Status Monitoring and Self Diagnostic. To use the DCU in Status Monitoring mode connect the DCU and turn the printer power on. The 7 segment LED display will show various codes that show the progress of the print operation.
1) Normal Code
While printing or warming up, it indicate the position of the paper Code 78 61 00~05 20 30 40 50 69 State System Initialisation Warming up Ready (exact code depends on paper size) Print Start Feed Sensor On Feed Sensor off Paper Out Sleep Mode Description The main processor is starting up The printer is on, the cover is open or close. The printer is ready. The paper is detected when the first page is printed. 00: Legal, 01: Letter, 02: A4, 03: EXEC, 04: B5 The engine controller received the print order from the video controller. 20: 1st, 21: MP, 22: SCF The paper is passing out of the Feed Sensor. The paper has passed out of the Feed Sensor. The paper has passed out of Exit Sensor. The fuser power is turned off to minimize the power consumption.
2) Error Code
When detecting the malfunction, the printing is stopped to indicate error code. Code 60, 62, 68 State Fuser Error Description An error has occurred in the fuser. · 60: Open Fuser Error · 62: Low Heat Error · 68: Over Heat Error The Printer Cover is open. The Toner Cartridge is not installed, No paper in the paper cassette. The front part of paper is jammed between pickup unit and Feed sensor. The front part of paper is jammed between the Exit sensor and Feed sensor. The front part of paper is jammed just after passing through the Exit sensor. LSU Scanner Motor not ready or Hsync signal not output.
64 65 70 71 72 73 95
Cover Open CRU Error No Paper Paper Jam 0 Paper Jam 1 Paper Jam 2 LSU Not Ready
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6.1.3 Self Diagnostic Mode
If Error code is displayed use the Self Diagnostic Mode to assist in solving the problem. Only use the Self Diagnostic mode for fault finding as many safety features are disabled. To enter the Self Diagnostic mode connect the DCU and hold down the [Down], [Shift] and [Stop] at the same time. Whilst holding these buttons turn the printer power on. Code 78 will appear in the display. Continue to hold the buttons for approximately 3 seconds until 00 appears then release the buttons. Use the [Up] or [Shift][Up] buttons to select the required test. To start the test press the [Enter] button. To stop the test press the [Shift] and [Enter] buttons together. Code 00 Main Motor Operating System The main motor is tested. Main High Voltage On (MHV-) -1550 volts output to MHV terminal.
Caution : High voltage probe should be used.
Description
01
02
Transfer High Voltage (-) On (THV-) -1000 volts output to THV terminal.
Caution : High voltage probe should be used.
03
Transfer High Voltage (+) Reference on (THV+) +1300 volts output to THV terminal.
Caution : High voltage probe should be used.
04
DEV/Supply High Voltage : DEV/Supply High Voltage Test. The leftmost of the three LEDs in the self-test panel is on and the DEV high voltage supply is output to the Supply HV terminal (-580V). Press the [Up] button to switch the voltage. The middle and right LEDs are on and -430 volts is output to the DEV HV terminal.
Caution : High voltage probe should be used.
05
LSU Operating System When you select the test the `OFF' LEDs will be lit. When you press ENTER the `ON' LED will light and after a few seconds the Righthand LED will be lit and the `ON' LED will go out. This indicates that the motor is up to speed. Pressing the `UP@ button will turn the laser LED ion and the `ON' and `OFF' LEDs will be lit to show the status of the laser LED. Pickup clutch on The main cassette solenoid is tested.
06
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Alignment & Adjustments
Code 07
Description Paper Empty Sensor Test : The `ON' LED indicates the status of the main cassette Paper Empty sensor. Feed & Exit Sensor Test The `OFF' LED indicates the status of the Exit sensor The 3 rd LED indicates the status of the Feed Sensor Note the Feed sensor also detects the presence of the toner cartridge Cover Open Sensor Test The `ON' LED indicates the status of the Cover Open sensor. Fuser Test When {Enter] is pressed the Heat lamp is turned on. The `ON' and `OFF' LEDS indicate the lamp status Hot Burn Test When the [Enter] button is pressed the printer continuously prints without detection. Turn the power off to stop this test. Cleaning Mode Print Mode Causes the `Cleaning' cycle to be repeated continuously Turn the power off to stop this test.. THV(+) TRIGGER. ALL HV : All high voltage are output to each HV terminal. TheLSU and the fan are started. In this Mode the electronic resistance of the transfer roller is detected and the THV is checked. PTL Test : Tests the PTL lamp The `ON' and `OFF' LEDS indicate the lamp status. Fan Test : Tests the Fan The `ON' and `OFF' LEDS indicate the fan status. MP Pickup Test : Tests the MP pickup clutch. The `ON' and `OFF' LEDS indicate the clutch status. MP Sensor Test : Tests the MP Paper sensor The `ON' LED indicates the sensor status.
08
09
10
11
12
13
14
15
16
17
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Alignment & Adjustments
No. 00 01 02 03 04
Function Motor MHV THV(-) THV(+) DEV
Enter Motor Run Mhv On Thv Negative On Thv On Dev On Supply
Up/Down
Stop Motor Stop Mhv Off Thv Negative Off Thv Off DEV Dev Off
Remar k
- 1550V -1000V +1300V
0 : -580V
0 : -430V
05 06 07
LSU Pic kUp PEmpty
LSU Run Pickup On
On
Off
Ready
LSU Stop Pickup Off
Paper Empty
08
Sensor
Ex it
Feed
09 10 11 12 13 14 15 16
Cover Fus er HotBur n Clean Print Thv Refer ence PTL FAN Manual Pic kUp Manual PTL On Fan On Manual Pickup On Fuser On HotBurn On Clean Printing
Cover Open Fuser Off
low
adequate
high PTL Off Fan Off Manual Pickup Off
17
Sensor
Manual Sensor
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Alignment & Adjustments
6.2 Paper Path
3
4
Fuser
L S U
CR DR OPC SR
Toner Cartridge
7
PR
2
Feed Sensor MP Sensor
PTL
TR
FR
6 5 1
P IC
1 2 3 4
Paper Input (Cassette) Paper Input (Manual Feeder) Paper Out(Face Down) Paper Out(Face Up)
5 6 7
Paper Empty Sensor Paper Feeding Sensor Paper Exit Sensor
K /R
L S U L S U L S U Fuser Fuser
EXIT Sensor
CR DR OPC SR
Toner Cartridge
CR DR PR OPC SR
Toner Cartridge
Fuser
EXIT Sensor
CR DR PR OPC SR
Toner Cartridge
EXIT Sensor
PR
PTL
TR
Feed Sensor MP Sensor
Feed Sensor
MP Sensor
PTL
TR
Feed Sensor
MP Sensor
PTL
TR
FR
FR
FR
P IC
Empty Sensor
K /R
P IC
Empty Sensor
P IC
Empty Sensor
K /R
1) After receiving the print command, the printer feeds paper from the main or optional second cassette or manual feeder as required. 2) The paper being fed passes the paper feed sensor. (Jam 0 occurs if the sensor is not operated within a certain time) 3) Having passed the paper feed sensor the paper moves to the paper exit sensor via printing process. (Jam 1 occurs if the sensor is not operated within a certain time) 4) The paper then passes through the paper exit sensor and out of the set. (Jam 2 occurs if the trailing edge of the paper does not pass the exit sensor within a certain time of the paper leading edge activating the exit sensor)
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Alignment & Adjustments
6.3 Clearing Paper Jams
Occasionally, paper can be jammed during a print job. Some of causes include: · The tray is loaded improperly or overfilled. · The tray has been pulled out during a print job. · The front cover has been opened during a print job. · Paper that does not meet paper specifications has been used. · Paper that is outside of the supported size range has been used.
If a paper jam occurs, the On Line/Error LED on the control panel lights red. Find and remove the jammed paper. If there is no paper visible look inside the printer. Do not use tweezers or other sharp metal tools when removing a jam. You may damage the toner cartridge, fuser rollers or potentially damage wiring insulation leading to an electric shock. Note If, when removing jammed paper, the paper tears ensure that ALL fragments of paper are removed from the printer otherwise a jam will re-occur.
6.3.1 In the Paper Exit Area (JAM2)
1) If the paper jams as it exits to the output tray and a long portion of the paper is visible, pull the paper straight out. 3) Loosen the paper if it is caught in the feed rollers. Then pull the paper gently out.
When you pull the jammed paper, if there is resistance and the paper does not move immediately, stop pulling. Continue with the next step. 2) Open the rear output tray.
Note: Please be careful when you open the rear cover. The inside of the printer is still hot.
4) Close the rear output tray. Open and close the front cover. Printing can be resumed. Caution: paper jammed in this area is very close to the fuser. This can be extremely hot. Take care not to get burned.
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Alignment & Adjustments
6.3.2 In the Paper Feed Area (JAM0)
1) Slide out the tray to expose the jammed paper. 2) Remove any missfeed paper by pulling it out by the visible edge from the tray. Make sure that all of the paper is properly aligned in the tray.
3) Slide the tray back into the printer. Open and close the front cover. Printing can be resumed.
6.3.3 Around the Toner Cartridge (JAM1)
1) Open the front cover and remove the toner cartridge 2) Gently pull the paper toward you.
3) Check that there is no other paper in the printer. 4) Reinstall the toner cartridge, and then close the cover. Printing can be resumed.
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6.3.4 Tips for Avoiding Paper Jams
By selecting the correct paper types, most paper jams can be avoided. If a paper jam occurs, follow the steps outlined in · Ensure that the adjustable guides are positioned correctly. · Do not overload the tray. Ensure that the paper is below the paper capacity mark on the right inside of the tray. · Do not remove the paper from the tray while printing. · Flex, fan and straighten the paper before loading. · Do not use creased, damp or highly curled paper. · Do not mix paper types in the input tray. · Use only recommended print media. · Ensure that the recommended print side is facing down when loading paper into the input tray.
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Alignment & Adjustments
6.4 Sample Pages
This product has the several sample pages for maintenance purposes and to help check the printer's functionality. Use the sample pages to check for the existence of any printing abnormality.
6.4.1 Printing a Demo Page
Print a demo page or a configuration sheet to make sure that the printer is operating correctly. 1) Hold down the Cancel button for about 2 seconds to print a demo page.
2) The Demo page or the configuration sheet shows the printer's current configuration.
ML-1520 Series
Monochrome Laser Printer
DigitAIIperformance
Up to 15ppm(Letter)/14ppm(A4) print speed True 600 x 600 dpi print resolution 150NHz processor 8MB Memory 250 sheets paper cassette
DigitAIIValue
One touch Toner Save Button - expand the life of the toner cartridge by 40% One touch Cancel Button Great Price, Great Performance
DigitAIIcompatibility
Windows 98/2000/Me/XP Various Linux OS including Red Hat, Caldera, Debian, Mandrake, Slackware, SuSE, and Turbo Linux USB 1.1 interfaces
R
www.samsungprinter.com
everyone's invited
TM
**AII other trademarks are the property of their respective owners. Samsung Electronics, AII rights reserved.
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6.4.2 Printing a cleaning sheet
If you are experiencing blurred, faded or smeared printouts. Printing a cleaning sheet cleans the drum inside the toner cartridge. This process will produce a page with toner debris, which should be discarded. 1) Ensure that the printer is turned on and in the Ready mode with paper loaded in the tray.
2) Press and hold down the Cancel button on the control panel for about 10 seconds. 3) Your printer automatically picks up a sheet of paper from the tray and prints out a cleaning sheet with dust or toner particles on it.
Note: The cartridge cleaning process takes some time. To stop printing, turn the power off.
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6.5 Consumables and Replacement Parts
The cycle period outlined below is a general guideline for maintenance. The example list is for an average usage of 50 printed documents per day. Environmental conditions and actual use will vary these factors. The cycle period given below is for reference only. COMPONENT Pick-up Roller Paper Feeding Roller(Friction Pad) Transfer Roller Fuser Toner Cartridge REPLACEMENT CYCLE 60,000 Pages 60,000 Pages 60,000 Pages 60,000 Pages Starter : 1,000 Pages Replacement : 3,000 Pages
6.6 The LED Status Display by Each Error
ERROR Open Fuser Error Over Heat Error Low Heat Error LSU not Ready Error (Pmotor Error) LSU Not Ready Error (HSYNC Error) LED Status The [Error] LED (red) and the [Toner Save] LED are simultaneously flashing at 1 second intervals. The [Error] LED (orange) and the [Toner Save] LED are simultaneously flashing at 1 second intervals. The [Error] LED (red) and the [Toner Save] LED are simultaneously flashing at 4 second intervals. The [Error] LED (green) and the [Toner Save] LED are simultaneously flashing at 1 second intervals. The [Error] LED (green) and the [Toner Save] LED are simultaneously flashing at 4 second intervals 96 95 62 68 DCU CODE 60
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6.7 Periodic Defective Image
If a mark or other printing defect occurs at regular intervals down the page it may be caused by a damaged or contaminated roller. Measure the repetition interval and refer to the table below to identify the roller concerned. No
1 2 3 4 5 6 7
Roller
OPC Drum Charge Roller Supply Roller Developing Roller Transfer Roller Heat Roller Pressure Roller
Defective image
75.5mm 37.7mm 47.8mm 35.2mm 45.3mm 57.1mm 59.7mm
Typical defect
white spot on black image or black spot black spot light or dark horizontal image band horizontal image band image ghost Black spot and image ghost black spot on the backside
L S U
Fuser
7
6
2 1 5 4 3
Toner Cartridge
PTL
MP Sensor
L S U
Fuser
PR
CR DR OPC SR
Toner Cartridge
PTL
TR FR
MP Sensor
P IC
1 2 3 4
OPC Drum Charge Roller Supply Roller Developing Roller
5 6 7
Tramsfer Roller Heat Roller Pressure Roller
K /R
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MEMO
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