1. CLX-317x Series Training
Feb. 2008
CRU Technical Notes

2. Objectives Understanding and building the ability to deal with
Component and layout of OPC-unit / dev-unit
Operations of each component and unit
Troubleshooting: possible problems in the field and solution to each problem

3. I. Consumable Part
For the best image quality, replace cartridges within appropriate time
Capacity : (additional) ,000 images (Y,M,C) & 1,500 (K) images
(initial w/ set) images (Y,M,C) & 1,000 (K) images

4. Ⅱ. Composition & Function
1. Toner Cartridge
Yellow Toner Cartridge
Magenta Toner Cartridge
Cyan Toner Cartridge
Black Toner Cartridge
Be careful not to damage dev. roller while plug- in & out of toner cartridge
Front Cover
High voltage contact point (Developing Roller)
High voltage contact point (Supply Roller)
CRUM

5. Ⅱ. Composition & Function
1. Toner Cartridge
Development Method : Non-magnetic one component type
Toner type : non magnetic one component pulverized toner
Capacity : 1,000(Y,M,C) / 1,500(K) Sheets
(N/N, Simplex, ISO/IEC standard pages)
Sus. Blade
Developing Roller
High voltage contact point (Supply Roller)
Spacer DR(Gap-Ring)
High voltage contact point (Developing Roller)

6. Ⅱ. Composition & Function
1. Toner Cartridge
Gear train : Torque transferred from SET drive gear to DR gear.
Gear IDLE
Gear Agitator
Gear Paddle
Gear SR
Gear DR

7. Ⅱ. Composition & Function
1. Toner Cartridge
Toner Supply Type : toner slider and supply roller
Toner layer control : toner layer thickness on dev. roller controlled by SUS.
blade’s trail-edge
Dev. gap control : gap ring located at both sides of dev. roller
Developing roller
Toner Slider
Supply roller
Toner Agitator
Shaft Paddle wire

8. Ⅱ. Composition & Function
2. OPC Unit Layout
OPC(Organic Photo-Conductor)
Life : Print over 35,000 Images
OPC Cleaning: Cleaning Blade (urethane)

9. Ⅱ. Composition & Function
2. OPC Unit Layout
OPC(Organic Photo-Conductor)
OPC Drum
Shaft OPC
Handle OPC
Cleaning blade
Charger Roller
Slider Waste OPC
Shaft Paddle OPC
Cleaning Roller
Erager Lamp

10. Error List Ⅱ. Composition & Function Invalid toner
Invalid Yellow (M/C/K) toner kit
Mismatch of model name, supplier ID, company name and etc.
Not install
Toner cartridge (Y/M/C/K) is not installed
Service call error
Fuser Low (Over) heat error
LSU error
Transfer belt error
Dev. Home error
Motor Lock error

11. Ⅳ. Printing Problems &Solution
1. Vertical Black Line and Band
Description: 1. Straight thin black vertical lines occur on the printout
2. Dark black vertical bands occurs on the printout
Check and Cause
Solution
Damaged development roller, deformed doctor-blade : In case of one color
Scratched / contaminated surface of the charging roller in OPC set : all colors layered
Damaged / contaminated ITB (Image Transfer Belt) : waste toner color
Damaged / deformed cleaning blade (OPC/ITB) : waste toner color
Replace toner cartridge and retest.
Replace OPC cartridge and retest.
Replace ITB cartridge and retest.
Replace OPC or ITB and retest.

12. Ⅳ. Printing Problems &Solution
2. Vertical White Line
Description: White vertical lines in the image.
Check and Cause
Solution
Contamination of the window or internal lenses of LSU : in case of all colors
Foreign matter in toner cartridge : one color
If the fuser is damaged, white spots occur periodically : all colors
ITB cleaning blade could touch with ITB wiping off a part of image : all colors
Clean the LSU window with recommended cleaner (IPA).
If foreign matter is inside LSU, replace LSU unit.
Replace toner cartridge.
Replace ITB unit.
Check the fuser ribs corresponding to white spot. Remove foreign matter or replace parts.

13. Ⅳ. Printing Problems &Solution
3. Horizontal Dark Band or White Band
Description: Dark or blurry horizontal stripes occur on the printout periodically
Check and Cause
Solution
Bad contacts between the imaging unit and high voltage terminals.
The rollers in the toner cartridge may be contaminated.
Charge roller – mm
Supply roller – mm
Develop roller – 26 mm
Transfer roller(T1) – 43.8 mm
Transfer roller(T2) – 55.2 mm
OPC Drum – mm
Fusier – 88.4 mm
Clean all high voltage terminals in the cartridge and the frame of the printer.
See the periodic table in the left to identify what sort of unit or component causes the problem.
Replace the relevant unit.

14. 2. White spots occur periodically in the printing
Ⅳ. Printing Problems &Solution
4. Black / White Spot
Description: 1. Dark or blurry spots occur periodically in the printing
2. White spots occur periodically in the printing
Check and Cause
Solution
Foreign matter sticking or contamination on toner cartridge, OPC drum, ITB unit, or fuser.
1) Charge roller – mm
2) Supply roller – mm
3) Develop roller – 26 mm
4) Transfer roller(T1) – 43.8 mm
5) Transfer roller(T2) – 55.2 mm
6) OPC Drum – mm
7) Fusier – 88.4 mm
See the periodic table in the left to identify what sort of unit or component causes the problem.
Replace the relevant unit.

15. Ⅳ. Printing Problems &Solution
5. Dark Image or Black
Description: The printed image is dark
Check and Cause
Solution
No charging voltage in the engine board.
Regardless of printable image, composite black image is printed. There could be a problem in charging process
In the case, it could cause wrap jam in the fuser
Check electric contacts to the HVPS

16. Ⅳ. Printing Problems &Solution
6. Uneven Density
Description: Print Density is uneven between left and right
Check and Cause
Solution
The pressure on the transfer roller by right and left spring is not even: springs are damaged, transfer roller is improperly installed, or transfer roller’s bushing or holders are damaged.
Toner cartridge has been expired.
Toner level is too low in the development cartridge.
Check if transfer roller and connected parts are properly installed
Replace ITB unit
Replace toner cartridge

17. Ⅳ. Printing Problems &Solution
7. Ghost
Description: Ghosting occurs in the interval of 26 mm or 188.5mm
Check and Cause
Solution
Bad contacts by contamination or foreign matter in HVPS board
Toner cartridge is expired.
Bad OPC
Check electric contacts to HVPS. Replace HVPS board
Replace toner cartridge
Replace OPC unit

18. Ⅳ. Printing Problems &Solution
8. Stains on the printout
Description: The printout are stained
Check and Cause
Solution
Toner leakage due to improper sealing in development unit.
Poor cleaning of OPC Unit or ITB Unit
Replace toner cartridge
Replace OPC Unit or ITB Unit

19. Ⅳ. Printing Problems &Solution
9. Stains on Back of Page
Description: The back of the page is stained periodically
Check and Cause
Solution
55.2 mm: 2nd Transfer roller could be contaminated when engaged or disengaged.
88.4 mm: Fuser roll could be contaminated due to cold offset
Check the period and replace the part with problem.
If there is a problem with disengagement, please check the operation of the clutch of driving T2 Roller, and replace it if it is necessary.

20. Ⅳ. Printing Problems &Solution
10. Blank page Print out
Description: Blank page is printed
Check and Cause
Solution
Bad electric contacts in toner cartridge or OPC unit
LSU Unit error
No development high voltage applied from HVPS
Check OPC-ground contact.
Check LSU Unit
Check HVPS Board

21. White /Black Spot, Periodical Band
Ⅳ. Printing Problems &Solution
Table. Periodic Images according to Rollers No
Roller
Period 현상 1
OPC Drum
188.5 mm
White /Black Spot 2
Charge Roller
37.7 mm
White /Black Spot 3
Supply Roller
32.8 mm
Periodical Band 4
Developing Roller
26.8 mm
White /Black Spot, Periodical Band 5
Transfer Roller(T1)
43.8 mm
Periodical Band 6
Transfer Roller(T2)
55.2 mm
Periodical Band 7
Gap-ring
32.84mm
Periodical Band 8
Fusing Belt
32.9 mm
White /Black Spot