HP DeskJet 640C

How to Identify and Fix Common Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced technical support :

Press your printer`s Setup button. Go to System Setup. Choose Print Quality and then Calibrate Color. Choose Calibrate Now and press OK.
White streaking through the printout or an entire missing color both indicate an empty cartridge. If the cartridge is depleted of one color, it needs to be replaced. Each color is necessary to create the colors used in day-to-day printing.
The most common cause of poor print quality and missing colors is debris build-up on the print head. Run your printer`s print head cleaning utility (instructions typically found in your user manual).
Check the options on the property tabs to make sure that the appropriate color options are selected. If there is a checkmark in the box by Print in Grayscale, click in the box to remove the checkmark, and then click OK. Try printing again.
Clean the printheads: Sometimes the issue why you are unable to print in color is because our printheads are clogged with ink. Clean the printheads and then print a document to check if color printing works. Some printers also have in-built programs that can clean themselves so remember to check for that.
Inkjet printers work via subtractive color mixing. As different colors of ink are combined, each ink absorbs (subtracts) its characteristic colors and amounts of light. The light that is then reflected back to our eyes is what we see as different colors.
At the Windows Manage your device screen, click Printer properties. Click Preferences. From the Color Mode dropdown, choose either Color or Black and White. Click OK to save.
Reasons why your HP printer has ink but won`t print

This may seem obvious, but it sometimes happens: first make sure your paper tray has paper in it. Misalignment, clogged printheads, faulty data communication or insufficient ink levels can also be sources of the problem.

There are a few things that could be the cause of this problem, including: Empty ink or toner cartridges that need replacing. Ink or toner cartridges that have become dislodged from their proper place. The wrong paper size loaded in the input tray.
Print color mismatch refers to a shift in the positions of colors that may occur when printing one image with multiple toner cartridges, causing printouts to appear blurry.
If your HP printer not printing black ink correctly, here`s what you should do. Using non-genuine ink cartridges. Printheads that have become clogged. Ink cartridges that are defective or empty.
There are numerous possible causes for a printer that`s randomly producing blanks. The most common ones are empty ink cartridges, improper cartridge installation, and congested nozzles. Driver and software issues can sometimes cause this problem as well.
Poor print quality is the most common complaint people have about inkjet printers. These problems often show up in the form of horizontal white lines running through each line of print. If you run into these types of issues, you can sometimes fix them by cleaning the print head.
Conclusion: CMYK Produces Superior Color in Printing

Ink on paper must use the CMYK color space to achieve the optimum results by creating an unlimited number and shades of color. CMYK will produce full, dark, rich and vibrant colors to bring your project on paper to life!

CMYK is a four-color process and stands for cyan, magenta, yellow and key (black), and is preferred for use on printed materials because it helps achieve a true color.
Check the ink level on your printer and replace the low ink cartridge. Clean the printhead. The printhead could be clogged, and you might need to clean the printhead several times to restore print quality. Use an automated tool from the printer control panel to clean the printhead.
Select Start > Settings . Go to Devices > Printers & scanners > select a printer > Manage.
Missing colours, streaky prints, smudges and ink blotches are all signs that your printer ink or toner cartridge may be damaged. Some printers will actually warn you if a cartridge is damaged and will refuse to print. This includes HP ink cartridges, Samsung toner cartridges and Canon ink cartridges.
Take-home Message

To summarize, all (or almost all) HP`s cartridges are refillable. Not all the chips can be reset or overridden, but HP will always leave a refill solution for you.

Yes, you can.

tested the performance of Original HP ink cartridges vs. remanufactured (refilled) brands. The results: Original HP ink cartridges far surpassed ink refills in both print quality and reliability.

Ink cartridges can dry out over time. If they are sitting in your machine for an extended period, they will eventually dry up and become unusable. The simplest way to combat this problem is by printing more frequently or running regular cleans and ink tests to ensure the nozzles remain clean.
The sponge end of a blocked printer head can be cleaned with only one liquid other than water. This liquid is isopropyl alcohol. Isopropyl alcohol isn`t strong enough to melt the sponge but is still strong enough to dissolve the ink inside the blocked printer head.
Look for the contact points on the print carriage inside the printer and gently wipe them off using a lint-free cloth. Make sure there isn`t any ink left on the printer contacts. Just as on the ink cartridges, if you are having difficulty removing the excess ink, use a cotton swab and mineral water until it is clean.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Canon MG6450 printer stopped brinting black colour
ANSWER : Hi there

Read Full Q/A … :

HP DeskJet 640C

the indicator lamp below the ink indicator sign bottom is lighting red in colour rapidly.
ANSWER : We have free Trial Reset Key.

Read Full Q/A … :

HP DeskJet 640C

Blocks of Type missing
ANSWER : When I said test print, I meant the nozzle print pattern test. GM

Read Full Q/A … :

HP DeskJet 640C

HP CLJ 2600 misaligned colours
ANSWER : Misaligned colors or printing.

Read Full Q/A … :

HP DeskJet 640C

HP Colour laserjet 2550n printer Tray2 issues
ANSWER : Ensure that the printer is turned on and in the Ready state.

Read Full Q/A … :

HP DeskJet 640C

Not printing colours properly
ANSWER : Try this method of cleaning the print heads. https://www.youtube.com/watch?v=ZheZf-vdho8

Read Full Q/A … :

HP DeskJet 640C

Epson L355 does not print colour
ANSWER : Maybe you just selected Black as the Color setting in the printer driver change this setting to Color. The color setting in the application you are using is not appropriate for color printing. Make sure that the settings in your application are appropriate for color printing. After This if any problem occur just dial our Toll-Free: +1-888-924-2961.

Read Full Q/A … :

HP DeskJet 640C

Colour printing
ANSWER : The printheads pop out on that model. There is a handle on top that you just pull up on. Then you can try taking it to the sink and flushing the heads on the bottom under hot running tap water. If that doesn’t work, you’ll probably need to replace the head. You want to pull out the cyan/magenta printhead.

Read Full Q/A … :

HP DeskJet 640C