[sane-devel] Canon 4200F USB chip location

LUH LAH welpthisdidnotwork at gmail.com
Thu Oct 21 20:07:29 BST 2021

Hello there!

Sorry about that, looks like it was indeed scrubbed.

I've instead uploaded them to here:

How do you capture a USB session?



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!
> 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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