If you have two scanners installed and receive the error "Can't open
Twain source", you might try turning on the other scanner.

I received this error with an Epson 4870 driver v2.34 under XP with all
the latest updates. Installing driver v2.65 did not resolve the
problem. Uninstalling and reinstalling the 4870 drivers and software
did not resolve the problem. Tried a couple different applications to
access the scanner. Finally, turned on my Brother MFC-8840DN
printer/copier/fax/scanner. Problem solved.

Epson Scan works fine even if the Brother MFC-8840DN is powered off (I
assume that this is because Epson Scan is not using Twain).

Interestingly, scanning using the Brother MFC-8840DN works OK even with
the Epson 4870 turned off.

"Ed" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> If you have two scanners installed and receive the error "Can't open
> Twain source", you might try turning on the other scanner.
>
> I received this error with an Epson 4870 driver v2.34 under XP with all
> the latest updates. Installing driver v2.65 did not resolve the
> problem. Uninstalling and reinstalling the 4870 drivers and software
> did not resolve the problem. Tried a couple different applications to
> access the scanner. Finally, turned on my Brother MFC-8840DN
> printer/copier/fax/scanner. Problem solved.
>
> Epson Scan works fine even if the Brother MFC-8840DN is powered off (I
> assume that this is because Epson Scan is not using Twain).
>
> Interestingly, scanning using the Brother MFC-8840DN works OK even with
> the Epson 4870 turned off.
>

What would happen if you did not have the Brother MFC-8840DN
printer/copier/fax/scanner?

Don't you think the there is a software conflict between the two installed
scanners.

The Epson Scanner is TWAIN, unless you plugged in the Epson and turned it on
before installing the Epson software. In which case, Windows XP installed a
WIA driver which would cause a TWAIN driver not found error. It that case,
you would have to remove the WIA driver to get the TWAIN to work.

Did you read what Epson have to say about the Epson Scan V2.65?
TWAIN Driver and EPSON Scan Utility v2.65A
Windows XP, Windows 2000, Windows Me, Windows 98SE
epson11374.exe - 10MB - posted on 04/15/05



This self-extracting file contains the EPSON Scan Utility and TWAIN
Driver v2.65A for Windows 98SE, Me, 2000 and XP. This file self-extracts to
your hard drive and is placed in c:\EPSON\epson11374.

Note:
Windows XP users: During installaton you may see a "Hardware Warning"
dialog box. Click "Continue Anyway" to complete the installation.
Windows 2000 users: During installation you may see a "Digital
Signature Not Found" dialog box. Click "Yes" to complete the installation


You Cannot Simultaneously Use Multiple USB Scanners in Windows XP
http://support.microsoft.com/default...b;en-us;324756

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