Take cartridges out of the printer, inside cartridge case if you look inside, in the back-middle part of it, you'll see black plastic. Take some swabs and wet them in alcohol, with it try to clean inside of the plastic.
Pict. is from DCP-J140 but PCB responsible for ink level recognition looks quasi the same. (Sorry for my English)
To check the ink levels from the control panel
1. Press Setup.
2. Press the down arrow button to highlight Tools, and then press OK.
3. Press the down arrow button to highlight Display Ink Gauge, and then press OK. The product displays a gauge that shows the estimated ink levels of all cartridges installed.
4. Press any button to return to the Tools menu.
To check the ink levels from the HP Photosmart Software
1. In the HP Solution Center, click Settings, point to Print Settings, and then click Printer Toolbox.
NOTE: You can also open the Printer Toolbox from the Print Properties dialog box. In the Print Properties dialog box, click the Features tab, and then click the Printer Services button.
The Printer Toolbox appears.
2. Click the Estimated Ink Level tab. The estimated ink levels for the ink cartridges appear.
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