Alphanumeric buttons On the HP 3330, use the alphanumeric buttons to enter fax data into the product’s display screen and dial phone numbers for faxing. For a full description on using alphanumeric key characters, see “Using Dialing Characters” in the User Guide on the product CD. Figure 6. Alphanumeric controls Note Keypad buttons are numeric on non-fax models and alphanumeric on the HP LaserJet 3330mfp. EN Identifying the control panel components 33