HPLIP

HP OfficeJet Pro 7740 Support

Asked by Gregory Smith

HP OfficeJet Pro 7740 on wireless network.
New (clean) Ubuntu 20.04 installation, hplip version 3.20.3+dfsg0-2.
Printing works fine. 3rd party app (Vuescan) unable to find scanner.
Built-in "Document Scanner" finds scanner OK.
Tried hp-setup to install/configure scanner.
On "Device Discovery" screen, selected "wireless".
After being prompted, connected USB cable. Get message "No wireless devices found" on GUI.
"error: No devices found on bus: usb" on terminal.
Printer/Scanner was fully functional on prior installation (Ubuntu 18.04) hplip version 3.17.?
Would like current version of hp-setup to be able to discover the device.

Question information

Language:
English Edit question
Status:
Solved
For:
HPLIP Edit question
Assignee:
No assignee Edit question
Solved by:
Gregory Smith
Solved:
Last query:
Last reply:
Revision history for this message
brian_p (claremont102) said : 		#1

> Would like current version of hp-setup to be able to discover the device.

Ok. But why? Considering you also say

> Built-in "Document Scanner" finds scanner OK.

"Document Scanner" is (I think) simple-scan. Please give what you get for

  scanimage -L

Cheers,

Brian.

Revision history for this message
Gregory Smith (smithge31419) said : 		#2

Thanks for the prompt reply Brian,

Results of scanimage -L

:~$ scanimage -L
device `escl:https://192.168.2.154:443' is a ESCL HP OfficeJet Pro 7740 series [B078BA] SSL flatbed scanner
device `escl:http://192.168.2.154:8080' is a ESCL HP OfficeJet Pro 7740 series [B078BA] flatbed scanner
device `hpaio:/net/officejet_pro_7740_series?ip=192.168.2.154&queue=false' is a Hewlett-Packard officejet_pro_7740_series all-in-one

Revision history for this message
brian_p (claremont102) said : 		#3

These are URIs for the scanner device. The first two relate to sane-escl, a
SANE backend that is introduced to Ubuntu 20.04. I suspect it is being used
by simple-scan. This is Ubuntu's intention. There isn't really a problem
here.

The third URI is for HPLIP. I think if you look closely at simple-scan, you will
find it knows about it but has used sane-escl as a preference.

I would expect that if xsane was installed it would offer both URIs upfront.

Anyway, you can scan. The issue does not appear to be with the software.

Revision history for this message
Gregory Smith (smithge31419) said : 		#4

Hi Brian,
Thanks for the prompt attention.
You are correct... It appears that the hp-install program is not needed. Scanning is fully functional.
I chased down the issue to a firewall block.
It seems that vuescan needs udp port 5353 open to find its network scanners.
Sorry to bother you.
Cheers...

Revision history for this message
Gregory Smith (smithge31419) said : 		#5

Hi Brian,
Thanks for the prompt attention.
You are correct... It appears that the hp-install program is not needed. Scanning is fully functional.
I chased down the issue to a firewall block.
It seems that vuescan needs udp port 5353 open to find its network scanners.
Sorry to bother you.
Cheers...

Revision history for this message
brian_p (claremont102) said : 		#6

> Sorry to bother you.

No bother at all, Gregory. Glad you are scanning successfully. Thanks for
engaging with the issue.

Cheers,

Brian.