HP Deskjet 6540 Color Inkjet Printer - Manual (Page 138)

Caution: Do not touch the print cartridge ink nozzles or copper contacts.
Touching these parts will result in clogs, ink failure, and bad electrical
connections. Do not remove the copper strips. They are required
electrical contacts.
1. Do not touch the copper strips
7. Hold the print cartridge so that the copper strips are on the bottom and facing
toward the printer, and then slide the print cartridge into the cradle as shown.
Note: After you insert the print cartridge, verify that the copper contacts of the
print cartridge touch the back of the print cartridge cradle.
8. Push down on the print cartridge latch until it snaps closed.
HP Deskjet 6500 series printers
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