[sane-devel] Canon MP700 support (partially OK)

[Gernot Hassenpflug]

Dear list,

I'm currently testing a Canon PIXUS all-in-one MP700 which is similar
in structure to the MP710 I had until recently (power failed, thrown
out).

I am using CVS, as shown by "scanimage -V":

scanimage (sane-backends) 1.0.22git; backend version 1.0.22


Results:
------------

Here the apparent capabilities as exposed to Xsane & scanimage:

Modes: Color & Grayscale (no lineart, i.e. B/W)

Resolutions: 75, 150, 300, 600, 1200 dpi (appears to be correct for
max resolution for this device)

I could successfully test color all resolutions. 300dpi I went up to
A4 size, then 600 & 1200 half a page and 1/4 page to save time. All
worked flawlessly.

For Grayscale, I could work perfectly with all resolutions *except* 1200 dpi.

Problem: for 1200dpi, the scanner starts to scan, perhaps 0.5 cm
movement, and then it hangs, light dimly on, and power button no
longer responds. With scanimage I can use Ctrl-C to cancel the scan
and the scanner recovers properly:

^Cscanimage: received signal 2
scanimage: trying to stop scanner
scanimage: sane_read: Operation was cancelled

Looking at the partial image scanned at 1200dpi shows that it is
probably not in the right format, as there are diagonal stripes to be
seen (the image as such is not recognizable).

I had a look at pixma_mp730.c and it is not clear to me if this is a
known error or owing to untested resolution & mode perhaps? I can
state from memory that I did not have this issue with the MP710 which
seems to follow the same protocol.

On the other hand, the man page for the pixma protocol lists the
Multipass MP700 and 730 rather than PIXMA MP700 & 730, so perhaps
there is some slight difference between the models depending on where
they are sold? PIXMA, PIXUS, Multipass...?

Logs:
--------

The log is too large to attach here, so I am sending a tgz version to Nicolas.

The log shows that suddenly the scan values become "ff" and in fact
the USB logs with SANE_DEBUG_PIXMA=21 shows that the last line does
not complete scanning, but immediately goes to some kind of error.
This repeats (see below) until I press Ctrl-C and cancel the scan.
Recovery is good and I can use the scanner without having to power it
off and on again.

[pixma]  00003d70:86 80 7b 6f 6a 6a 6d 72  7a 78 7a 78 74 77 7f 7e
[pixma]  00003d80:7e 75 6d 69 6e 77 78 7a  79 75 74 76 7d 7d 80 7b
[pixma]  00003d90:75 70 6d 71 78 78 7a 78  79 7c 82 83 84 77 75 6f
[pixma]  00003da0:6b 70 75 78 7a 76 74 6f  73 77 79 72 6d 54 3a 35
[pixma]  00003db0:30 30 ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
[pixma]  00003dc0:ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
[pixma]  00003dd0:ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
[pixma]  00003de0:ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
[pixma]  00003df0:ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
[pixma]  00003e00:ff ff ff ff ff ff
[pixma]
[pixma] OUT  T=7.369 len=10
[pixma]  00000000:d4 20 00 00 00 00 00 c0  04 00
[pixma]
[pixma] IN   T=7.372 len=6
[pixma]  00000000:06 06 00 00 00 00
[pixma]
[pixma] OUT  T=7.475 len=10
[pixma]  00000000:d4 20 00 00 00 00 00 c0  04 00
[pixma]
[pixma] IN   T=7.478 len=6
[pixma]  00000000:06 06 00 00 00 00
[pixma]
[pixma] OUT  T=7.581 len=10
[pixma]  00000000:d4 20 00 00 00 00 00 c0  04 00
[pixma]
[pixma] IN   T=7.584 len=6
[pixma]  00000000:06 06 00 00 00 00

Any comments and things to try most welcome,

Regards,
Gernot Hassenpflug
-- 
ISP Asahi-Net: http://asahi-net.jp/en/
No.1 in Japan by customer satisfaction
(Nikkei News, 7 July 2010)