[sane-devel] Canon 4200F USB chip location

[Jörn-Ingo Weigert]

Usually with a tool called wireshark (
https://www.wireshark.org/download.html) and a filter enabled for usb only.
Depends on your system environment, you maybe have to install a general
purpose usb driver which enables to debug the usb traffic.

But the last time I used wireshark, it will give you a hint if that is
needed.

LUH LAH <welpthisdidnotwork at gmail.com> schrieb am Do., 21. Okt. 2021, 21:07:

> Hello there!
>
> Sorry about that, looks like it was indeed scrubbed.
>
> I've instead uploaded them to here:
>
> https://drive.google.com/drive/folders/1-n2ABYtWhAGOW18siwKGjOc81Op7IUIA?usp=sharing
>
> ------------------
> How do you capture a USB session?
>
> Thanks,
>
> -[K] IMSOASIAN
>
> On 10/21/21, Ralph Little <skelband at gmail.com> wrote:
> > Hi,
> >
> > On 2021-10-17 7:25 p.m., LUH LAH wrote:
> >> Hello there!
> >>
> >> I recently acquired a Canon 4200F scanner and realized after extensive
> >> research that the USB chip couldn't be found. So, I opened up and
> >> de-soldered the mainboard RF shield/Heat Sink to find a bunch of
> >> chips.
> >>
> >> I've attached said images to this message.
> >>
> >> My question is, what chip is exactly for the USB port?
> >>
> >> Thank you very much!
> >>
> >> -[K] IMSOASIAN
> >>
> > The scanner is not currently supported by SANE.
> > We do have a prior report from someone documented here:
> > http://www.sane-project.org/unsupported/canon-4200f.html
> >
> > However, I'm not aware of any active work on this machine.
> >
> > The chip marked L6219DS appears to be a PWM motor controller:
> >
> https://www.allegromicro.com/-/media/files/datasheets/l6219ds-datasheet.ashx
> >
> > The chip marked WM8196SCDS appears to be an ADC for the imager:
> > https://pdf1.alldatasheet.com/3efc5524-e7be-47c7-99d3-9d2c2ebaba01
> >
> > There is a DRAM memory package:
> > https://www.esmt.com.tw/upload/pdf/ESMT/datasheets/M12L16161A(2R).pdf
> >
> > The other chip is probably a microcontroller of some sort, which may
> > have an integrated USB port.
> >
> > Unless you can identify the microcontroller, then analysis of captured
> > USB sessions using the Windows driver is what you have left.
> > ---------------
> >
> > I didn't get the images that you say that you have attached. They may
> > have been scrubbed in the submission process.
> > Perhaps you could reply to the list and myself with the attachment again?
> >
> > Cheers,
> > Ralph
> >
>
>
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