My printer Hp 840c is not printing colour prints?

Starnley Johnwells

• 1031 Answers
• Posted on May 17, 2008

SOURCE: Printer HP 3550 print only red colour

check the printer software color selection for correct setting

SOURCE: hp 840c no red printing

Dip the head area of cartridge in hot water by 2 to 3 seconds two or three times and use tissue to check the color, if all three color comes out to tisssue paper, then it works else you have to replace the cartridge.

Ahmad Bilal

SOURCE: can't print red despite installing a new colour

Read on and see if any applies to you.
Check that you removed the protective tape. some cartridges have two of these pieces of tape one over the head and possibly on on the contacts to the printer.

If you recently re-filled or had the cartridge refilled or even bought one of the many cheaper replacement cartridges you should read on

Most modern cartridges have an ink level chip built on to them.
Should the level drop below 25% then most of these chips lock up and will not reset.

Re-filling them will have no effect

If you are lucky you should be able to find either a chip resetter around on the INTERNET or maybe even local

OR

Even better empty cartridges that never need to be reset.
The second option is my preference

I realise these are not for your specific printer but there are others listed on both those sites as well.

cheaper cartridge problems have been on the rise recently and that is for ALL makes of printer.
If you try to clean the contacts be VERY careful cleaning contacts and ONLY use isopropynol on a lint free bud or cloth.
Also be very gentle.

I have seen the contacts cleaned and cartridges ruined with other methods of cleaning.
Rubbing too hard can also cause a badly set chip to move making it inoprable.

I dont like full prices replacements either which is why I always provide the links
I usually reccomend that people take back any cartridge that does not work right from the get-go.

I dont know of anyone who has had a problem doing that be it a shop refill or otherwise.

No matter if I paid $1 or $100 for a cartrdige I would still expect it to work

SOURCE: HP 840c Printer - Print quality problem.

I have no magenta trying second cartridge still same problem

Tareq Bin Mostaq Mostaq

• 1449 Answers
• Posted on Feb 28, 2010

SOURCE: My 840c printer will only print black not colour

May be problem on your printer properties.
you uninstall your printer driver and again install driver then fix your problem.