My HP Officejet Pro L7650 printer says "Cannot

hp officejet pro l7650 to repair the power supply
http://www.partshere.com/models/hpprinters.asp?printer=C8197A
HP Officejet Pro L7650 All in One Printer Troubleshooting
http://www.sparepartswarehouse.com/HP,OfficeJet-Pro,L7650,C8197A,Printer,Power-Supply.aspx

Hi,

Try reset your printer by following this procedure to reset it,

1. Without turning the unit off, unplug the power cord from the back of the product.
2. Press and hold # and 6 keys.
3. While holding those keys plug the power cord back in.
4. Wait until the screen goes blank before you release those keys.
5. Follow on printer screen instructions.This should fix the problem.

Sounds to me that your transfer kit may need replacing if your have toner

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

If you need more help come back.Post / thumbs / testimonial are welcome!

There isn't a good fix for this problem. You can try the following;
1. Plug Unit Directly into wall, not thru a powerstrip.
2. Reset the Printer, Unplug Power Supply, Wait 30 Secs. Re-connect. Turn Power Back On.
3. Open Case, Wait for Printheads to move to right. Take Out Offending Printhead. Clean Gold Contacts / Soak Print Nozzles in 1/8" Water, if dried out. shake printhead to loosen stuck nozzles (watch out for flying ink!!). DO NOT PUT PRINTHEAD BACK IN YET!! Close Cover. Wait for printer to say "XXX Printhead is missing" Re-Open Cover, Wait till printheads move to right, Re-Insert Printhead, Close Cover. Reset if Necessary.
4. BTW None of this worked for me. I'm gonna see if anyone I know has one of these printers and swap out parts to see if it is indeed the printhead(s).
5. According to other posts, HP Service will tell you to try all of the above, then when it doesn't work, they tell you your printer is defective. Someone else mentioned a bad firmware problem. If you're out of warranty, your screwed. Another HP Horror Story! Oh My! California wants to elect their old CEO. lol.

Every cartridge needs to have ink in it to print. Even if you only want to print black and white and one of your colors is empty. A dirty little industry secret is that when you print black....it also makes the colors print too...so you get to buy even more ink than you need to!

The reason why the printer refuses to print if you get low on one or more colors is that the system runs off negative pressure through the ink lines to the print head. If you were able to continue printing with an empty cartridge you could get air in the respective ink line, disrupt the negative pressure, make it so that that color will no longer print, and require you to get the printer serviced to fix the problem. I own a Cartridge World ink refilling store and I feel this is a good machine (compared to some of the others out there). The only down side with this type of machine is the print heads expiring or getting clogged as you are experiencing. The reason the black is clogged and not the other colors is that the black ink is pigment based and the colors are dye based. The pigment based inks do tend to clog print heads over time. You can try to rehydrate the print head with warm distilled water. if you can't get it working to your satisfaction you can buy a new black/yellow print head for $72. With this type of printer you should print at least one black and white and one color document per week to keep the print heads fresh. If they sit too long without ink flowing through them then they can get clogged and print poorly. I hope this helps belay some of the resentment you hold towards your printer.

verify if you have ink in yellow cartridge
perhabs you should change it

Hello sir; It need to clean up paper feed roller.

Normal 0 Could have a corrupt driver.
Disconnect the printer or at least be sure it is turned off. I'd do both and when the CD software program asks you to connect the printer to the USB port, do so and it should again work properly.
Hope this helps. Bud