Printer problem when printing, there is a vertical white streak on the page so that words are not clear.

Check the remaining service life of the drums, also check the condition of your transfer belt. It is most likely your problem is one of those two elements.

carriage problem

Issue: How do I align the print head?
Solution: Perform a Print Head Alignment (Windows)- MX340

Aligning the Print Head Position Print head alignment corrects the installation positions of the print head and improves deviated colors and lines. The procedure for performing print head alignment is as follows:

Print Head Alignment

1. Open the printer driver setup window
   • In Windows Vista, select the Start menu -> Control Panel -> Hardware and Sound -> Printers.
     
     
   • In Windows XP, select the Start menu -> Control Panel -> Printers and Other Hardware -> Printers and Faxes.
     
     
   • In Windows 2000, select the Start menu -> Settings -> Printers.
     
     
     
2. Right-click your model name icon, and then select Printing Preferences from the displayed menu.
   
   The printer driver setup window appears.
   
   
3. Click Custom Settings on the Maintenance tab.
   The Custom Settings dialog box opens.
   
   
4. Check the Align heads manually check box.
   
   
5. Click Send, and click OK when the confirmation message appears.
   
   
6. Click Print Head Alignment on the Maintenance tab The Start Print Head Alignment dialog box opens.
   
   
   
   
7. Load three sheets of A4 size or Letter size plain paper into the rear tray (3).
   
   
   
   
8. Execute head alignment Make sure that the machine is on and click Align Print Head.
   Follow the instruction in the message.
   
   
9. Check the printed pattern
   Enter the numbers of the patterns with the least amount of streaks in the associated boxes.
   Clicking the patterns with the least amount of streaks in the preview window, will automatically set their numbers in the associated boxes.
   
   
   
   
10. When you have entered all the necessary values, click OK.
    
    Note:
    • If it is difficult to pick the best pattern, pick the setting that produces the least noticeable vertical white streaks.
      
      
      (A) Less noticeable vertical white streaks
      (B) More noticeable vertical white streaks
      
      
    • If it is difficult to pick the best pattern, pick the setting that produces the least noticeable horizontal white streaks.
      
      
      (A) Less noticeable horizontal white streaks
      (B) More noticeable horizontal white streaks
      
      
11. Confirm the displayed message and click OK.
    The second pattern is printed.
    Important: Do not open the Scanning Unit (Cover) while printing is in progress.
    
    
12. Check the printed pattern
    Enter the numbers of the patterns with the least amount of streaks in the associated boxes.
    Clicking the patterns with the least amount of streaks in the preview window, will automatically set their numbers in the associated boxes.
    
    
    
    
13. When you have entered all the necessary values, click OK.
    
    Note:
    
    • If it is difficult to pick the best pattern, pick the setting that produces the least noticeable vertical white streaks.
      
      
      (A) Less noticeable vertical white streaks
      (B) More noticeable vertical white streaks
      
      
      
14. Confirm the displayed message and click OK.
    The third pattern is printed.
    Important: Do not open the Scanning Unit (Cover) while printing is in progress.
    
    
15. Check the printed pattern
    Enter the numbers of the patterns with the least noticeable horizontal stripes in the associated boxes.
    Clicking the patterns with the least noticeable horizontal stripes in the preview window, will automatically set their numbers in the associated boxes.
    
    
    
    
16. When you have entered all the necessary values, click OK.
    
    Note:
    
    • If it is difficult to pick the best pattern, pick the setting that produces the least noticeable horizontal white stripes.
      
      
      (A) Less noticeable horizontal white stripes
      (B) More noticeable horizontal white stripes
      

Note: To print and check the current setting, open the Start Print Head Alignment dialog box, and click Print Alignment Value.

Replace the magenta image unit. Yellow image unit also and for the white streaks have the glass that cover the laser cleaned.

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/normanj_7893313f0751935f

If you are getting vertical white streaks or faded streaks from the top of the page to the bottom. It sounds like the developer blades in the imaging unit needs to be replaced. It cost around $120 to replace, but after a while it will happen again. This is a common problem with this printer. It can be cleaned by taking the unit apart and cleaning the developer blades, if you are handy. I have posted detail instructions in my tips section. or you can click on this link:

http://www.fixya.com/support/r4120906-clean_developer_blades_samsung_clp_300.

Hope this helps.

You can pull out each cartridge and shake it gently to redistribute the toner. Try a half page test to eliminate the various stages of the image formation. The timing on this is not easy but through trial and error it can be helpful.

From the service manual:


Vertical lines or streaks

Check for a leak where light might be entering the printer.

Check for circumferential scars on the photosensitive drum. If scars are present, replace the
drum cartridge if the line goes through all colors.

Check for circumferential scars on the upper fusing roller. If scars are present, replace the upper
fusing roller if the line goes through all colors.

Remove the imaging drum and inspect main charger or imaging drum for a contaminant, such as
a fiber, if the line goes through all colors.
CAUTION Do not expose the imaging drum to light for more than 15 seconds. The drum is light sensitive, and
exposure to light can cause permanent damage.
Vertical black lines

The toner cartridge is defective.

The toner cartridge is not seated properly.

The fuser entrance is dirty.

The fuser has scratches on it.

This might be a repetitive defect. If so, the lines will repeat at a consistent interval down the page.

The printer needs to be cleaned.

There is a problem in the heating element.
Vertical white lines

If white lines or streaks appear only in the black areas of the printed media, print several
configuration pages to clear the anomaly. If this does not clear the problem, check the sleeve
surface to confirm the defect, then replace the black toner cartridge.

If white lines appear only in a particular color, try printing several configuration pages to clear the
error. If the error does not clear, check the sleeve surface to confirm the defect, then replace the
defective toner cartridge.

There is a lack of toner or the toner cartridge is faulty.

There is dirt in the laser path.

The fuser is defective.

A mirror in the laser scanner is dirty.

you have 2 problem.
1). toner is bad
2). toner is low
change the toner should fix both porblem.
try to clean the roller while you have the toner out. (just in case).

Hey Chuck, Any chance you can post a scan of one of the faulty pages ? This will make it easier to assess the fault. Print off about 10 pages of a page that is affected by the lines. Look at each page and see if you can detect a recurring pattern over any of the pages. If there is a pattern, chances are it is probably the PCU that is marked.

you will have to check the Minolta web tech support team for this one.