Acer ScanPrimo ST 1220ST to work with Windows 7 and a PCI host adapter works just fine I use it every day. The key is to use a third party scanner software called Vue Scan 9.0.57 and using the following start-up procedure so Windows 7 can find the scanner on the SCSI controller. First open windows device manager, then turn on scanner, immediately right mouse click in device manager and select scan for new devices. Windows 7 will immediately find the scanner. It seems that windows will only see the scanner through the SCSI interface during the scanners startup sequence. It has been a while but I believe this works with Mira Scan V4.03 as well.
Testimonial: "Update: 12/17/2017 The above also works for Windows 10."
SOURCE: Problem with the Acer AcerScan Prisa 340P Flatbed
BenQ has not (and never will) write drivers for Windows 7. The scanner technology does not allow a parallel port scanner to work in Windows 7.
As per your question, you are facing problems with the Sony 2 Bays 68-Pin SCSI3 External Drive Case, you can try with checking all it's cables and power connectors. If the problem still exists you can visit this web page for more help and support :
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This is an older scanner that can also scan negatives and
transparencies up to 8x10 and is an inexpensive alternative to a newer model.
It uses the old Centronic SCSI type connection but can be made to work with Windows 7 and LSI PCI host adapter LSI20329IE Ultra 320 using a VHDCI 68 PIN TO CENTRONICS 50 PIN
(CN50) CABLE. I had trouble getting the new host adapter to see the scanner. I
purchased a new 6 foot cable and it seems to connect more reliably. I have now
purchased a third cable with internal High Byte termination to see if this
cable improves Windows' ability to recognize the scanner further. During my
testing I purchased a third party driver called VueScan to replace the old MiraScan
driver that came with the scanner. The VueScan install seemed to cause both
drivers to work properly under Windows 7 - go figure?
If you have the
scanner attached through an SCSI card and Windows 7 does not reliably see the
scanner here is the fix:
Download Devcon.exe from Microsoft, a command line device
utility.
From the command prompt utility run Devcon.exe with the "rescan"
argument listing the fill path to the command where Devcon.exe is installed on
your machine.
For example:
C:\Users\Andrew\AppData\Local\Temp\i386\Devcon rescan
As an alternative the command can be pated as above into a
shortcut on your Windows 7 desktop and initiated at any time causing the system
to find the scanner.
You can also consider creating a batch command file that
includes the driver to initiate the finding of the scanner and the opening of
the scanning utility in one action.
You can test the function of this fix by looking to see if
the scanner shows up in the device list in the Control Panel's Device manager,
deleting the device and running the Devcon utility to reinstall it.
Update: I found that if I turn the Windows 7 computer on then open control panel/device manager then turn thte scanner on and while it is going through its startup sequence right clic in device manager and select scan for new devices Windows finds the scanner every time.
Update 12/17/2017 the original posting procedure works for Windows 10 as well.
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