SAN FRANCISCO — HP has failed to shunt aside class-action legal claims that it disables the scanners on its multifunction printers when their ink runs low. Though not for lack of trying.

On Aug. 10, a federal judge ruled that HP Inc. must face a class-action lawsuit claiming that the company designs its “all-in-one” inkjet printers to disable scanning and faxing functions whenever a single printer ink cartridge runs low. The company had sought — for the second time — to dismiss the lawsuit on technical legal grounds.

“It is well-documented that ink is not required in order to scan or to fax a document, and it is certainly possible to manufacture an all-in-one printer that scans or faxes when the device is out of ink,” the plaintiffs wrote in their complaint. “Indeed, HP designs its a