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# Connection How-Tos

How to check if the printer is connected to the computer.

1. Unplug the printer from your computer, open a terminal/console window and enter this command. This will display the syslog.

tail -f /var/log/messages

for Ubuntu:

sudo tail -f /var/log/syslog

then reconnect the printer. You should see the system display something like:

Mar 16 11:45:43 localhost kernel: [4298892.030000] hub 2-1.2:1.0: USB hub found Mar 16 11:45:43 localhost kernel: [4298892.033000] hub 2-1.2:1.0: 4 ports detected Mar 16 11:45:44 localhost kernel: [4298892.316000] usb 2-1.3: new full speed USB device using uhci_hcd and address 11 Mar 16 11:45:44 localhost kernel: [4298892.409000] hub 2-1.3:1.0: USB hub found Mar 16 11:45:44 localhost kernel: [4298892.412000] hub 2-1.3:1.0: 4 ports detected Mar 16 11:45:44 localhost kernel: [4298892.697000] usb 2-1.2.1: new full speed USB device using uhci_hcd and address 12 Mar 16 11:45:44 localhost kernel: [4298892.798000] drivers/usb/class/usblp.c: usblp0: USB Bidirectional printer dev 12 if 1 alt 0 proto 2 vid 0x03F0 pid 0x4311 Mar 16 11:45:44 localhost kernel: [4298892.798000] scsi6 : SCSI emulation for USB Mass Storage devices Mar 16 11:45:44 localhost kernel: [4298892.975000] usb 2-1.2.2: new full speed USB device using uhci_hcd and address 13 Mar 16 11:45:44 localhost kernel: [4298893.063000] usb 2-1.2.2: not running at top speed; connect to a high speed hub Mar 16 11:45:45 localhost kernel: [4298893.077000] drivers/usb/class/usblp.c: usblp0: USB Bidirectional printer dev 13 if 0 alt 0 proto 2 vid 0x03F0 pid 0x8804 Mar 16 11:45:45 localhost kernel: [4298893.255000] usb 2-1.3.1: new full speed USB device using uhci_hcd and address 14 Mar 16 11:45:45 localhost kernel: [4298893.342000] usb 2-1.3.1: not running at top speed; connect to a high speed hub Mar 16 11:45:45 localhost kernel: [4298893.356000] drivers/usb/class/usblp.c: usblp0: USB Bidirectional printer dev 14 if 0 alt 1 proto 2 vid 0x03F0 pid 0x2817 Mar 16 11:45:45 localhost kernel: [4298893.360000] scsi7 : SCSI emulation for USB Mass Storage devices Mar 16 11:45:45 localhost kernel: [4298893.539000] usb 2-1.3.3: new full speed USB device using uhci_hcd and address 15 Mar 16 11:45:45 localhost kernel: [4298893.624000] usb 2-1.3.3: not running at top speed; connect to a high speed hub Mar 16 11:45:45 localhost kernel: [4298893.638000] drivers/usb/class/usblp.c: usblp0: USB Bidirectional printer dev 15 if 1 alt 0 proto 2 vid 0x03F0 pid 0x5711 Mar 16 11:45:45 localhost kernel: [4298893.638000] scsi8 : SCSI emulation for USB Mass Storage devices

Then enter this command:

dmesg

You should see something like this displayed:

[4298893.638000] scsi8 : SCSI emulation for USB Mass Storage devices [4298893.638000] usb-storage: device found at 15 [4298893.638000] usb-storage: waiting for device to settle before scanning [4298897.802000] Vendor: HP Model: Officejet 74xx S Rev: 1.00 [4298897.802000] Type: Direct-Access ANSI SCSI revision: 02 [4298897.816000] sd 6:0:0:0: Attached scsi removable disk sdb [4298897.816000] sd 6:0:0:0: Attached scsi generic sg1 type 0 [4298897.817000] usb-storage: device scan complete [4298898.366000] Vendor: HP Model: LaserJet 2840 Rev: 1.00 [4298898.366000] Type: Direct-Access ANSI SCSI revision: 02 [4298898.381000] sd 7:0:0:0: Attached scsi removable disk sdc [4298898.381000] sd 7:0:0:0: Attached scsi generic sg2 type 0 [4298898.384000] usb-storage: device scan complete [4298898.642000] Vendor: HP Model: Photosmart Rev: 1.00 [4298898.642000] Type: Direct-Access ANSI SCSI revision: 02 [4298898.657000] sd 8:0:0:0: Attached scsi removable disk sdd [4298898.657000] sd 8:0:0:0: Attached scsi generic sg3 type 0 [4298898.660000] usb-storage: device scan complete

enter this command:

/usr/lib/cups/backend/hp

You should see something like this displayed:

direct hp:/usb/Photosmart_series?serial=XXXXXXXXXXXXXX "HP Photosmart_series" "hp:/usb/Photosmart_series?serial=XXXXXXXXXXXXXX" direct hp:/usb/HP_Color_LaserJet_2840?serial=XXXXXXXXXXXX "HP HP_Color_LaserJet_2840" "hp:/usb/HP_Color_LaserJet_2840?serial=XXXXXXXXXXXX" direct hp:/usb/Deskjet_6980_series?serial=XXXXXXXXXXXXXX "HP Deskjet_6980_series" "hp:/usb/Deskjet_6980_series?serial=XXXXXXXXXXXXXX" direct hp:/usb/Officejet_7400_series?serial=XXXXXXXXXXXXXX "HP Officejet_7400_series" "hp:/usb/Officejet_7400_series?serial=XXXXXXXXXXXXXX"

These are several ways to confirm that the printer is connected and working with your system.

Page last updated: Tue Dec 5 14:27:42 2006; HPLIP Version: 1.7.4a