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HP OfficeJet 8600 Series Printer. Enter your serial number to check your warranty status. Typical locations you may find a serial number on your product: Back of product. Under the battery. For laptops, press Fn + Esc. For desktops, press Ctrl + Alt + s. For Chromebooks, on the sign in screen, press Alt + v. On the barcode. cara bersihkan speaker hp kena air