HP Deskjet 6540 Printer series - Print cartridge status light is on orflashing

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Print cartridge status light is on or flashing

The HP Deskjet 6540-50 series printer has two print cartridge status lights. The left

light corresponds to the left print cartridge, and the right light corresponds to the

right print cartridge.
The HP Deskjet 6520 series printer has a single print cartridge status light for both