HP Deskjet 842c Printer - Manual (Page 17)

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3 Remove the print cartridges from their individual packages.
4 Carefully remove the protective vinyl tape from the tri-color
and black print cartridges.
5 For each print cartridge, lift the cradle latch inside the printer.
With the copper electrical contacts toward the rear of the
printer and the print cartridge held vertically, push the print
cartridge firmly down into the cradle.
Insert the black print cartridge in the right cradle, and insert
the tri-color print cartridge in the left cradle. You must insert
both print cartridges for the printer to operate.
Note: Be sure not to touch the ink nozzles or the copper
electrical contacts. Also, do NOT remove the copper strip;
these are electrical contacts required for proper operation
of the print cartridges.
Tri-color
Print
Cartridge
Black
Print
Cartridge
Vinyl Tape
Vinyl Tape
Ink Nozzles Ink Nozzles