Hi,
I have a multifunctional Canon Pixma MP830 all-in-one device and has
worked for a long time with no problem.

But nowadays, i'm receiving error "cannot communicate with scanner"
which is very common error about Canon's Twain driver. I have no
problem acquiring to the TWAIN, however i can see the twain interface
but the problem comes out while scanning process is about at half, it
fails scanner's lid stucks and freezes saying error "cannot
communicate with scanner".

The biggest and strangest clue is that MP Navigator (Canon's standart
scanning soft) fails during scanning, but another applications like MS
Imaging and Scanning Wizard or ACDSee can scan "fine" using "canon's
Twain SCANGEAR MP".

As i said, i've installed TWAIN and software with obeying instructions
very carefully and i didn't do any wrong failure during scanning or
installing.

I've tried these with no luck:
1-Removed then re-installed all the Twain drivers
2-Re-installed MP Navigator
3-Tried using lower DPI, even in 100 dpi i got error, if i use 300dpi
on another softwares usually it works.
4-I set services automatic which were set to manual and started.
5-I tried different USB ports.

I have no idea and the biggest change on my XP SP2 was installing .NET
Framework 2.0.

Note: I also have a Canon digital Camera using on the same computer,
on the same USB port. However changing different ports did NOT help.

Finally, i'd been using this scanner really fine till now. I cannot
blame hardware because other apps works OK lower then 300dpi or with
300dpi.

Please take care and share your experiences.


Also, i couldn't find a direct feedback mail form towards Canon,
however plenty of users claim tech support of Canon is not good.

Regards.

However, changed the USB cable all is fine now but the question is:

I was used to have 150cm standard USB cable which is recommended, but
after replacing it with 120cm cable problem went away?

What are the recommended cable length and brand-made types?

The issue isn't so much length as quality. I have had cases where a
given cable just would not work with a given device. The replacement
cable worked fine ... even if it was longer.


kimiraikkonen wrote:
> However, changed the USB cable all is fine now but the question is:
>
> I was used to have 150cm standard USB cable which is recommended, but
> after replacing it with 120cm cable problem went away?
>
> What are the recommended cable length and brand-made types?
>
>
>

On Jul 22, 4:20 am, Barry Watzman <WatzmanNOS...@neo.rr.com> wrote:
> The issue isn't so much length as quality. I have had cases where a
> given cable just would not work with a given device. The replacement
> cable worked fine ... even if it was longer.
>
>
>
> kimiraikkonen wrote:
> > However, changed the USB cable all is fine now but the question is:
>
> > I was used to have 150cm standard USB cable which is recommended, but
> > after replacing it with 120cm cable problem went away?
>
> > What are the recommended cable length and brand-made types?- Hide quoted text -
>
> - Show quoted text -

Barry, you're right, sorry for late response. I changed the USB cable
probably more quality one, worked fine. However the previous (crappy)
cable claims that it's usb 2.0 and it just about 1,5 USD then i bought
a better cable which is worth 6 dollars... But the result is fine, the
new cable is a bit shorter than old (120 cm) but i couldn't understand
i surprised that usually scanners *not printers* choose cables
according to themselves and they are not cable-friendly. They require
quality cables where there are a lot of china-made crappy ones...

On Fri, 20 Jul 2007 05:33:46 -0700, kimiraikkonen <(E-Mail Removed)>
wrote:

>Hi,
>
>But nowadays, i'm receiving error "cannot communicate with scanner"
>which is very common error about Canon's Twain driver.
snip...
>Regards.

Replace your computer power supply with a beefier one.

Many scannrs draws a lot of power and USB is limited to 500mA. As you add more
gadgets on your computer, the less current is available. The same thing goes
for aging power supplies. After adding a new video card in my computer, my
CanoScan Lide 70 could not "communicate" anymore with my machine. After
replacing my 300W power supply with a 550W one, it work well again!

Replacing the USB cable with a high quality one might work too: the bigger the
cable, the less resistive they are and the more current to the scanner you
have...

Benoît-Nicole Morrissette

Benoît-Nicole Morrissette ((E-Mail Removed)) writes:
> On Fri, 20 Jul 2007 05:33:46 -0700, kimiraikkonen <(E-Mail Removed)>
> wrote:
>
>>Hi,
>>
>>But nowadays, i'm receiving error "cannot communicate with scanner"
>>which is very common error about Canon's Twain driver.
> snip...
>>Regards.
>
> Replace your computer power supply with a beefier one.
>
> Many scannrs draws a lot of power and USB is limited to 500mA. As you add more
> gadgets on your computer, the less current is available. The same thing goes
> for aging power supplies. After adding a new video card in my computer, my
> CanoScan Lide 70 could not "communicate" anymore with my machine. After
> replacing my 300W power supply with a 550W one, it work well again!
>
> Replacing the USB cable with a high quality one might work too: the bigger the
> cable, the less resistive they are and the more current to the scanner you
> have...
>
> Benoît-Nicole Morrissette


Generally printers "like" to be connected directly to the computer rather
than through a hub, but (with a good cable) wouldn't a powered high-speed
hub avoid the problem of "stolen" voltage?

Brendan