When I print a color page, there is a multi colored line about a 1/2 inch thick along the left side of the paper. The print quality is good for everything on the page, just this line of swirled colors. Any ideas? I have tried cleaning of the machine according to the manual but that did not help. This does not happen with a black and white page.

If you do not get an answer, you might try the company's Support site at:
http://printer.konicaminolta.com/support/current_printers/mc2430dl_sup.htm

try to replace magenta , Yellow , CYAN

Follow these steps to change print settings, and then print in Mac OS X 10.6. Step one: Select your product

1. In the program from which you want to print, click File , and then click Print . Figure 11: Click File, and then click Print
2. Select your product from the Printer: drop-down list.

Step two: Change print settings

1. Type the number of copies to print in the Copies text box.
2. If you want to print multiple copies, select the Collated check box to print the pages of each copy in order.
3. Select the pages of the print job that you want to print. To print all pages, select All. To print a specific range of pages only, type the page number that begins the page range in the From text box. Then, type the page number that ends the page range in the To text box.
4. Select the size and type of paper loaded in the product from the Paper Size drop-down list.
5. Select the orientation for your print job. To print in portrait orientation, click the icon on the left. To print in landscape orientation, click the icon on the right.

Step three: Change the paper type and quality settings

1. After the Orientation section, click the drop-down, and then select Paper Type/Quality . NOTE: This drop-down usually defaults to the program specific drop-down. In this example, the drop-down is the TextEdit drop-down. Figure 12: Select Paper Type/Quality
2. Adjust the Paper Type setting to match the paper loaded in the product.
3. Adjust the Quality setting to change the print quality of the printed page.
4. Select Print Borderless to print photos without a white border.
5. To change the color profile or to turn on Photo Fix, click the arrow next to Color Options to display the Color Options menu. Figure 13: Color Options menu 1 - Paper Type/Quality menu options 2 - Color Options menu (only available if you click Color Options)

Step five: Print the print job After all the settings match the needs of the print job, click Print on the Print window to print the document or print job.

To clean the NVRAM, please follow the steps given below:

1. Press the "Up-Arrow" button and "Menu" Buttons Simultaneously.
2. Press the "Down Arrow" button until the LCD displays "Clean NVRAM."
3. Press "Select." The LCD should display “Success” or “Failed.”
If it is successful, please try this printer self-test by following the steps given below:

1. Press the "Menu" button.
2. Press the down arrow button 9 times until the screen displays "Print Test Page."
3. Press the "Select" button to begin printing the self-test.
You should see text followed by a thick 1-inch black bar. Under this bar, should be a process gray bar about a 1/2-inch thick. Below this line should be a set of railroad like bars of cyan, magenta, and yellow.

Should this test fail, try it again without cartridges installed. If the self-test still fails to take paper in and make sounds like the carrier is moving across the paper, this is a hardware issue, and the printer will require service. If the self-test completes without any cartridges installed, run the self-test again with only the color cartridge installed. (If you have both black and color cartridges, after this test, run the test again with just the black cartridge installed.) If you find that either cartridge causes the self-test to fail, please let us know.

If the self-test prints, but has lines or smudges or other print quality issues, please let us know. This includes any print quality issues, we need to know if the problems you have with your black or color are based in the printer, or communications with your computer, or the computer's software.

Most of the Lexmark printers (including the Z- and X- series) pull the paper down on one side slightly faster than the other. The printer hardware should even this out when printing. You should also ensure the paper meets the automatic feeder requirements of the printer.

If printing is skewed, feeding multiple pages or jamming, please follow these instructions (use a regular letter size paper to test after doing the steps given below):

Please check to ensure there is nothing obstructing the paper feed mechanism down inside the printer where it is not easily seen. If there is nothing obvious, unplug the printer and remove the paper. Open the front cover and look above the steel rod. You should see a conveyor belt with rubber teeth on it, like a fan belt. Take the bottom part of that belt and move it gently to the left. The cartridges should come out with it. Make sure the cartridges can move fully from one side of the printer to the other. Check also the output rollers on the bottom of the printer for any blockage. If it is jamming under the carrier assembly, you may be able to fix it using the manual feed slot. Turn the printer off. Next take a #10 envelope and feed it through the left side of the paper feed slot (The manual paper feed slot is preferred, but the automatic feed will do if there is no manual paper feed for this printer) until it comes completely through the printer to the back of the exit rollers. Move it up and down and slowly move it over to the right side. If something is stuck under the black guide plate this may work it loose or you may have to feed the envelope through the front rollers and push your way backward (please be careful here).

Next, take a damp warm cloth and clean the rubber rollers in the automatic sheet feeder. Dust may be coating the rollers there and as they become less tacky, they cannot feed paper correctly.
Then plug the printer back up, take your paper out and replace it with a fresh, small stack (about 5 pages) of paper. Quickly bend the stack in an 'S' shape a few times to separate pages. Make sure it is lined up on the right side of the paper feed and the paper guide on the left is snug on the left side of the paper. Then try to form feed again. If that works, then try to print the self test page.

Please follow the steps given below to perform the self-test:

1. Press the "Options" button 9 times. "Maintenance/Align" should now appear in the display screen.
2. Press the "Right Arrow (+)" until "Test" appears.
3. Press "Select."

You should see text followed by a thick 1-inch black bar. Under this bar, should be a process gray bar about a 1/2-inch thick. Below this line should be a set of railroad like bars of cyan, magenta, and yellow.

Should this test fail, try it again without cartridges installed. If the self-test still fails to take paper in and make sounds like the carrier is moving across the paper, this is a hardware issue, and the printer will require service. If the self-test completes without any cartridges installed, run the self-test again with only the color cartridge installed. (If you have both black and color cartridges, after this test, run the test again with just the black cartridge installed.) If you find that either cartridge causes the self-test to fail, please let us know.

If the self-test prints, but has lines or smudges or other print quality issues, please let us know. This includes any print quality issues, we need to know if the problems you have with your black or color are based in the printer, or communications with your computer, or the computer's software.
If the self-test prints your test bar(s) clearly, the printer hardware is not at fault.

Please remove the cartridges from the printer. Take a dry lint free paper towel and gently wipe the contacts on the back of the cartridge (not the bottom from where ink is present). Wipe the contacts inside the printer (on cartridge carrier). Please snap the cartridges back into the cartridge carrier.

Next, try this printer self-test by following the steps given below:

1. Please press the "Options" button 10 times. "Cartridges" should now appear in the display screen.
2. Press the "Left Arrow" button once, which then brings you to the "Self-Test" option.
3. Press the "Select" button once. You will hear a series of clicks.
4. It should print out a sheet of paper with horizontal color and black lines and smaller vertical lines.

You should see text followed by a thick 1-inch black bar. Under this bar, should be a process gray bar about ½-inch thick. Below this line should be a set of railroad like bars of cyan, magenta, and yellow.

Should this test fail, try it again without cartridges installed. If the self-test still fails to take paper in and make sounds like the carrier is moving across the paper, this is a hardware issue, and the printer will require service. If the self-test completes without any cartridges installed, run the self-test again with the color cartridge installed. (If you have both black and color cartridges, after this test, run the test again with just the black cartridge installed.) If you find that either cartridge causes the self-test to fail, please let us know.

If the self-test prints, but has lines or smudges or other print quality issues, please let us know. This includes any print quality issues, we need to know if the problems you have with your black or color are based in the printer, or communications with your computer, or the computer's software.

If the self-test prints your test bar(s) clearly, the printer hardware is not at fault.

I'm not sure that there is a problem here.  The correlation between print speed and print quality, 
especially on InkJet printers, is a negative one.  That is, the higher the quality setting, the lower 
the speed. So, if you're selecting the greatest quality for your print option you will suffer the 
lowest output speed.  This is because the printer is taking time to ensure that it prints each 
minute detail onto the page.
 
If you are looking to keep the quality optimal, one solution may be to select a different grade of 
photo paper (or perhaps one with a different coating [matte, semi, gloss]) and test to see if you 
can lower the quality setting on these higher-end paper types and still achieve your desired 
results.

To get what you want from your printing paper, you will have to consider what you like in a print, 
how you intend to use your prints, and what you are willing to pay to achieve this at home. 
Some things to think about include: paper thickness, color brilliance and resistance to fading. 



1. Paper Thickness
When it comes to paper thickness, paper that resembles the look and feel of traditional prints 
will be the best if you like to print a lot of photos and pass them around. Thick paper just feels 
right in your hands and will also stand up better to handling. However, if you are going to put 
the majority of your photos straight into an album, a thinner paper may work just as well for you.



2. Color Brilliance
To ensure the photo paper you purchase produces good color, you can purchase small sheaves 
of a short list of photo papers which you think will suit you. Next, print a series of colorful test 
photos on each to see which has the best color. If you can incorporate colorful photos that also 
have prominent straight lines and people in them, you will also be able to check the quality of 
sharpness and skin tones in the same test.



3. Resistance to Fading
Always try to check the resistance of the paper to fading. Simply take your batch of test photos 
and tape them to the window that gets the most sunlight throughout the day. Then, before you 
go in to pick up a batch of replacement paper, check to see which photos, if any, are showing 
signs of fading. Any paper that shows signs of fading in this short time frame should be avoided.



4. Changing Your Ink

It is also important to remember that any time you change ink for your printer, you may find 
yourself getting dramatically different results.

Check your Toner Carts.
Is the line a certain color?
Black perhaps?

Lift the door of the toner cart.
If you see a streak on your toner drum, you will see a streak on your paperwork.

Look at your fuser as well.
Is there a problem with the big orange roller?
BEWARE! Don't touch the fuser roller its EXTREMELY HOT!
Let the printer cool down before inspecting.

1 of 3 things I can think of off top of my head.
Since they are straight, I would suspect the transfer unit.
If it were just one color it would be that imaging unit.
Unlikely the fuser.
It doesn't sound line an issue called bar coding ,where the machine prints random lines. That would be a software issue.
Take the transfer unit out and inspect it for the marks.
I am assuming the streaks are on all colors correct?
If it isn't on the transfer belt, and on all colors check the fuser and see if its latched.

The following can cause bands (vertical on a normal page)


Faulty Toner cartridge
Faulty Drum Unit
Faulty Transfer Belt
Contaminated Fuser
Damaged or dirty LSU glass

I've also seen this sort of thing caused by a crusty build-up of toner on a wiiper blade on the Transfer Belt, and or Drum.