[sane-devel] Simple Scan on Ubuntu 20.04 with Canon Pixma TR4540

[Ralph Little]

Hi Lucy,
Sorry to hear that you are still having issues with this device. :(


On 2020-05-18 2:55 a.m., Lucy Dixon Hendry wrote:
>
> Hi Ralph & Thierry & co
>
> Thank you for getting back to me. I have run the following commands as 
> suggested:
>
>> apt update
>> apt install libsane libsane-common sane-utils
>
>> sudo apt upgrade
>
> But I'm still getting exactly the same response from Simple Scanner - 
> it sees the printer, but when I attempt to scan is says scanner not 
> connected.
>
> I'm at my wits end! Any more suggestions?  I have multiple page 
> documents to scan.
>
>

OK, I have a few suggestions to see what is going on here.

Firstly, if this is a new scanner to you, I would check that the scanner 
does not require you to select some mode on the device itself to enable 
remote scanning.
I have a Canon multi-function machine here (imageClass MF4770n) and in 
order to do scanning, I have to set it into "Remote Scanning" mode using 
the control panel, otherwise, I get exactly the same error as you, 
although the error is pretty generic.

Secondly, I assume that you are using the ADF at the moment. Could you 
attempt a scan on the flatbed area and let us know if this works?
The reason I ask is that the pixma backend has problems with a number of 
newer Pixma machines and this would at least determine that SANE is 
talking the right language and getting through to the device 
sufficiently to have a conversation. Also, while clunky and awkward 
compared to the ADF, you might be able to get some work done.

Thirdly, perhaps you could type the following in a terminal window:

SANE_DEBUG_PIXMA=50 SANE_DEBUG_ESCL=50 SANE_DEBUG_DLL=10 simple-scan 
 >pixma.out 2>&1

...and try to perform an ADF scan. This should generate some informative 
information about the escl and pixma backends, the things that are being 
loaded.
Then attach the pixma.out file that is generated to a reply here.

Hopefully, we can get you going.

Cheers,
Ralph




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