Opening HP 7550 housing (photosmart)

ANSWER : Press the Power catch () to turn on the item.

ANSWER : MIne is doing the same thing tonight!!

ANSWER : I had this error after the printer sat idle for many months. I thought it was the cartridge drive belt stretching, because it was extremely loose and wouldn’t move the carriage due to slippage. Then I noticed there was a gear belt tensioner to the right side that had some movement. Sure enough, when I shined a flashlight into the ink reservoir, there was a spring that had fallen down inside. Looking at the plastic belt tensioner, it looks as if the spring was held on by a plastic post that had broken off. This is most likely the cause of many of these errors, because the plastic break is very clean and not readily visible, (a design flaw in my opinion). Rather than trying to replace the part, I am going to try tapping a hole in the plastic and inserting a machine screw that can hold the tension spring in place. It also looks like the metal notch for the right hand loop of the spring, would not prevent the spring from slipping off at some point, so using a metal file to enlarge the notch may be necessary. If you’re lucky, your spring may have just popped off and is inside the ink reservoir. This may be one reason why the printer was discontinued so soon. One lousy five dollar part makes the whole printer worthless… I use this this printer primarily because it is easy to clean the heads by removing the carts, instead of having to disassemble the whole damn thing, as in ink tank designs. It makes beautiful 13×19 prints with better color accuracy than my Vivera 6 ink printer.

ANSWER : Check estimated ink levelsFollow these steps to check the estimated ink levels.

ANSWER : I held the # and 6 down long enough to start a complete re-set of the printer But the Black ink level still shows as depleted when it is actually still half full.

ANSWER : Remove the color cartridge and do a “blot” test by pushing the heads on the bottom onto a paper towel. You should see all the colors. If not, then run hot tap water on the heads. Could be a bad ink cartridge if it still doesn’t work.

ANSWER : rgtr

ANSWER : Well I just solved my issue with my hp 3310 displaying the ink error code. I held the OK cancel black and color buttons down at same time. And while holding those down hit the power button when machine shut off I released buttons hit power button on it came on and shut off. Hit power button again and it will reset machine and run a maintainace program. When all is done run a print report. Mine works fine. Good luck.