Question about HP LaserJet 2820 Printer

2 Answers

Red dots on left of page

Whenever I print in colour I get a series of evenly spaced red dots all down the left side of the page. It doesn't happen when I pring in black. I have removed and cleaned all cartridges and the parts of the printer I can get to.

The dots do not look like residue from ink on a roller etc but look like small commas (,) and the density of the printing is the same on each dot (no fade).

Any ideas would be appreciated.


Posted by on

  • ukk9 Jan 25, 2008

    The distance is 34.5mm between the dots. Thank you for your assistance.


  • Anonymous Mar 27, 2014

    I have black dots evenly spaced don the page about 4 inches from the right margin in portrait. How do I get rid of them.



2 Answers

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

Hi, I am having the same problem, but my service is locked.  How do i figure out what the code is?  i don't have the manual

Posted on Feb 03, 2008

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert who has achieved Level 3.

  • Master
  • 788 Answers

You need to measure the distance between two dots (In milimeters if possible). After that I may be able to determine what is causing the problem.

Posted on Jan 24, 2008

  • Dean Joly
    Dean Joly Jan 25, 2008

    According to HP the first thing to check is that you have the printer set to the right paper type, this can be changed in the print properties of the printer driver.

    Next is that there might be a dirty roller that will clean itself over time, but you can clean the printer more thoroughly.

    Here are the two methods for cleaning the device:

    To clean the paper path from HP Toolbox

    Use HP Toolbox to clean the paper path. This is the recommended cleaning method. If you

    do not have access to HP Toolbox, use the method in To clean the paper path from the

    device control panel.

    1. Make sure that the device is turned on and in the Ready state.

    2. Open HP Toolbox.

    3. On the Troubleshooting tab, click Maintenance, click Cleaning Page and then click

    . A page with a pattern prints from the device.

    4. At the device, remove any print media that might be in tray 1.

    5. Remove the page that printed and load it face-down into tray 1.

    6. At the computer, click Clean.

    To clean the paper path from the device control panel

    If you do not have access to HP Toolbox, you can print and use a cleaning page from the

    device control panel.

    1. Press MENU.

    2. Use the < or the > button to find the Service menu.

    3. Press ENTER.

    4. Use the < or the > button to find Cleaning Mode.

    5. Press ENTER.

    6. Load plain letter or A4 paper when you are prompted.

    7. Press ENTER again to confirm and begin the cleaning process.

    A page feeds through the printer slowly. Discard the page when the process is completed.

    After that they suggest that the imaging drum might be low but since you problem goes away when doing black and white prints then I would not suspect the drum. They also suggest the fuser but again, if the fuser was faulty you would see the defect on black pages two.

    If cleaning doesn't fix the problem then I would suggest changing the magenta toner cartridge first.



1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

My bizhub c451 suddenly started printing and copying nothing but colourful dots and lines all over the page. even with a test page i can only see a windows logo and all dots and lines, no text. even

Make sure the ink cartridge is full or new. Get to the "Maintenance" page and try an alinement. (The ink dries and will clog the jets if not used often enough.)

Jan 01, 2015 | Konica Minolta Bizhub C451...

1 Answer

Konica Minolta 2430 DL has Smudges or dots on page

Not an expert on this brand of printers but it looks like dirty feeder rollers to me. Try cleaning them and Print a Blank document and see if the marks show up

Jan 24, 2014 | Konica Minolta magicolor 2430 DL Laser...

1 Answer

Black dots are printing on the left hand side of the page when I print from my hp laserjet 1015. Any ideas how to fix this?

Run a "half test". Put paper in the manual feed tray. Print anything. Watch the paper, when it feeds about 1/2 way into the printer, open the cover. Pull out the toner and look down at the paper. If it has the dots, replace the toner. If it doesn't have dots, the fuser is probably bad.

Aug 31, 2011 | HP LaserJet 1018 Printer

1 Answer

4 colour dots on printout but not 150mm apart

Measure the distance between two of the same coloured dots down the page, if it is just over 150mm then it is caused by scratches on the photoconductor drum (this is the only thing that has a 15.4mm circumference). Try printing a black and white only document, only the black dots should appear. Removing the photoconductor and gently polishing the blue drum with a soft cloth can help if the scratches are not too deep, otherwise a new photoconductor is the only route.

Sep 06, 2009 | Epson Aculaser C1100 Printer

1 Answer

We have just changed the photoconductor unit on our Epson Aculaser CX11NF printer. When we print or copy, we get coloured spots on the right hand side of the page

Oh-ho! The coloured spots are what is known as "traffic lights". To be sure these are the symptoms: You will have a black spot then a slightly larger gap then the three colours regularly spaced, the pattern will repeat every 150mm or so. If you print a black only page then only the black dot will appear, print with any colours and all four dots will be printed. It is caused by a tiny/slight scratch on the photoconductor (PCU) drum (usually caused by mishandling, a loose or foreign object inside the printer or even trying to print on stapled paper!). Polishing the drum using a very soft dry cloth can often help to get rid of the scratch, but remember to keep it away from any bright light as this will damage the sensitivity of the drum. The traffic lights will be in line with the scratch so concentrate your efforts in that area. Also, while the PCU is out, take a good look inside the printer for any loose or protruding objects, rotate the toner cartridges from above with the front cover closed (opening the front locks the cartridge carousel in position). I sincerely hope this helps as the only other remedy is to replace the PCU with a new one.

Jul 07, 2009 | Office Equipment & Supplies

1 Answer

11 blue dots print out down the left hand side of documents

It's probably the toner cartridge again. See if you can spot defects at the cyan drum unit that matches the marks on your printout.

Apr 14, 2009 | HP LaserJet 4600dn Color Printer

1 Answer

Solution for "I have a Epson Aculaser c1100 and four coloured dots have appeared when printing. These dots are approximately 5cms from the left side of the page and print in a small vertical group. Each...

The four coloured dots are what is known in the trade as "Traffic Lights". They happen when the photocuductor (PCU) drum gets scratched. If you do a black only print you will only get a black dot, if you do a print with some colour in it you will get all four dots repeated at 150.41mm (PCU drum circumference) intervals. The best answer would be to replace the PCU but it is expensive. The alternative is to take out the PCU, find the scratch and try to polish it out with a very soft cloth. This will only work on the lightest of scratches. Be very careful not to scratch the drum further and avoid shining any bright light on it as it will damage the photo-sensitive surface (normal ambient light is OK).

Apr 11, 2009 | Epson Aculaser C1100 Printer

1 Answer

11 blue dots print out down the left hand side of documents

it sounds like the CYAN toner cartridge is leaking.

Jan 22, 2009 | Office Equipment & Supplies

1 Answer

Printer prints a colour dot at every pages edges

Hi ,
if u get red dots on print it may be problem with Red cartridge Lick age please check u r printer with Ok cartridge .if same problem with new cartridge then u need to clean Mirror built in lance assembly

Jul 11, 2008 | HP LaserJet 3800dn Printer

Not finding what you are looking for?
HP LaserJet 2820 Printer Logo

440 people viewed this question

Ask a Question

Usually answered in minutes!

Top HP Office Equipment & Supplies Experts

Doctor PC
Doctor PC

Level 3 Expert

7733 Answers


Level 3 Expert

102366 Answers

Ben Johnson

Level 3 Expert

685 Answers

Are you a HP Office Equipment and Supply Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides