HP Deskjet 950c won't print black

Try Using the HP Print Diagnostic Utility in Windows - HP Customer Care (United States - English)

It is a problem with the mechanic.

I think I may have another solution. I remember some time ago going to HP to get an update for my 950c printer. I think I read something that said, "If you do not really need to download this update, don't do it." I downloaded it anyway. I think then I begin to get notices saying when my ink was getting low, usually long before it actually did. I am thinking also, the same software that gave me those readings, also may have read the color cartridge (and possibly also black) may have caused the printer to turn on the blinking resume (orange light). I then deleted the updated software and reinstalled the original software that came with my computer or old application for the printer. I restarted my computer and tried it again. The blinking light did come on at first; then I realized I had not set the printing format to black only. I also disconnected my printer both and module and power for about five minutes. Still not sure since I just did this, but the orange light is not coming on and the printer prints. LOL, I am low on black ink though.

Make sure you have taken the protective tape off the cart printhead. make sure levers are down correctly and nothing is jamming the side travel of the head. It is possible you have defective cartridges.

I use a clear silicone tube to carefully prime the carts by sucking a dab of ink out of the tiny print holes before installation. I am careful to have a tight seal at the holes to prevent getting too much ink and possibly getting it in my mouth.

Clean the contacts on the carriage with piece of cotton and then clean the contacts on the cartridge with rubber and try again. If this not help replace the cartridge.

• I replaced both carts with HP brand, no joy.
• I cleaned the cart/printer connections, no joy.

An interesting aside is that if one or the other cart is removed, the appropriate LED goes out and the other blinks. At least some of the sensing circuitry sees the cart.

Anyone have a schematic of the cart/printer electronics?

i suggest you inspect the bottom, to see if anything is compromising the connection pad.

drivers de la hp 950

1st thing would be to remove the cartridge & check for any damage to the copper contacts as these are what tell the printer that a new cart has been installed. Next make sure you removed the tape covering the nozzles (I've done this before & boy do you feel silly).

If this all looks OK then pull the power out while the cart is still not fitted (this will fully reset the printer).

Once it comes back up, try fitting the cart again also checking that the contacts in the cartridge holder are not damaged/dirty.

This should sort the problem

Cheers
Shaun