[sane-devel] HP ScanJet 6300C head moving back/forth during scan >200dpi

[Michael Ole Olsen]

I think you may be right that the scanner is USB-1.1 , I have
unfortunately only tested with scsi under windows and I dont have access
to a Windows machine currently.

What I could find out on google it seems to be usb-1.1 but im not 100%
sure.

I tried setting the scanning speed to low in xsane but the speed is the
same as with normal speed still when scanning, i would think that this could fix the going
back and forth of the scanning head because of the scanners potential
usb-1.1 bottleneck ?


/michael ole olsen
gnu at gmx.net


On Mon, 14 Apr 2008, m. allan noah wrote:

> no, i meant the scanner is usb 1.1. have you tried using the usb under windows?
> 
> allan
> 
> 2008/4/14 Michael Ole Olsen <gnu at gmx.net>:
> > Hello again
> >
> >  It's a USB-2.0 machine (the hub is integrated on the motherboard,
> >  ASUS A7N8X deluxe), and I have had no other issues with the usb hub
> >  running fullspeed; I get fine transfer speed to my camera with gphoto2
> >  and to my usb-sticks.
> >
> >  No problems under Windows and also no problems when using the scanner with
> >  scsi or scanner-server (rj45), so the scanner isn't wrecked.
> >
> >  I cannot use the SCSI feature on this computer though - and I don't have
> >  the scanner server here, that's why I want to use it with USB.
> >
> >
> >
> >  /michael ole olsen
> >
> >
> >
> >
> >  On Mon, 14 Apr 2008, m. allan noah wrote:
> >
> >  > On Mon, Apr 14, 2008 at 10:34 AM, Michael Ole Olsen <gnu at gmx.net> wrote:
> >  > > Hello, I am having problem using my HP ScanJet 6300C with libusb and
> >  > >  xsane+sane backend from debian testing. I have also tried debian etch
> >  > >  version on another computer with same issues, and I even tried
> >  > >  downgrading my sane backend (then it went completely insane and almost
> >  > >  broke the scanner). Right now im testing on a cometely fresh install of
> >  > >  Debian/testing.
> >  > >
> >  > >  There are no scanner modules loaded/in kernel and the kernel is PREEMPT 2.6.23.9
> >  > >
> >  > >  When I do a scan, it waits about 6-8 seconds before scanning (just like
> >  > >  it is calibrating), then it moves the scanner head back and forth while
> >  > >  scanning (only when i get over approx. 200dpi)
> >  > >
> >  > >  I did read somewhere on this mailinglist, that it had to do with USB
> >  > >  bandwidth, so the scanner must wait at above 200dpi for the transfer of
> >  > >  data to complete over USB.
> >  > >
> >  > >  I'm using it with a high-speed USB 2.0 hub, so i dont see how there
> >  > >  could be any kind of transfer-bottleneck.
> >  >
> >  > it's a usb 1.0 machine? does it do this on windows?
> >  >
> >  > allan
> >  > --
> >  > "The truth is an offense, but not a sin"
> >
> > -----BEGIN PGP SIGNATURE-----
> >  Version: GnuPG v1.4.6 (GNU/Linux)
> >
> >  iQIVAwUBSANxQiXlragqp/ZIAQKhuRAAkquaQNG5zNNJ1YSrXhAdCLLkAC9ymuIE
> >  Gg+cH1ca3EVZVMImM3u2SzM1ETJGCMf5KpGhFdeJd663UhWyNTlgLbkSjFzin3Ys
> >  q+W2zTkKqzSldQtWwzi8SRx00aJDlWq07btWLCK0DSfOtv6xAOh9hI6Mzgr3lGM2
> >  jtlzJIVz8eWdVIRPHl3sf1esPVnuDBEdAYn6Cn/0oJBNFRX/V+N5AVnFkCXDoSEn
> >  qNYzWCCjWoNPFqC4ZzuD2EVck678twaxcji36kAmGDXscTWw65rOMxsKPMP4p5px
> >  EtVKsn+0x6NgsariuAtZvmlZqyoTkYU4BkMQWwLfCasszsWh+ka4/uBpguxj/8e0
> >  KGKy3YkAw4H5MAr2H+sd+nFOLFaDanG75xb3wlXaDgtkSCk+Hkm/99+GI70XIEQK
> >  WC4Y7c5QtclbcgSxJM/Y+aNfur2l9Av2L+254EP7j66ZCDQh3dCKiYe2vQ1iM41i
> >  NHKeFBb7SIUsHihuEHQ6BmFwytMX3fZzaQ18HKcQlJDR6F8WOPbl2JGgi7d+guBd
> >  UXP2WgO+PUe5Ubgc+mlHaweF/RIsvGy+jmxUMuhnEftUaoXyByQkOFlJb1x5Z+p3
> >  M2+jXFvY/bPzfXIMHU0sMHHsOShZck3KobX0z3gxLEMQ2U6A3lV2QqQFMaDDnFoN
> >  HvPzpPqPgBA=
> >  =p4Oi
> >  -----END PGP SIGNATURE-----
> >
> > --
> >  sane-devel mailing list: sane-devel at lists.alioth.debian.org
> >  http://lists.alioth.debian.org/mailman/listinfo/sane-devel
> >  Unsubscribe: Send mail with subject "unsubscribe your_password"
> >              to sane-devel-request at lists.alioth.debian.org
> >
> 
> 
> 
> -- 
> "The truth is an offense, but not a sin"