What should I do if my printer is connected to an aftermarket continuous ink system?
HP's limited warranty is void in the event the printer is attached to an aftermarket apparatus or system that modifies the printer's functionality such as a continuous ink system. This means the warranty coverage will no longer apply if such a modification is made. (Page 3)
From the official HP Officejet Pro 6970 All-in-One Printer manual, page 3
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