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We are working with an HP Photosmart 7510 all-in-one machine. On some systems (Not on all) the device does not open. The exception that it receives is "Unknown return code" . It is all the more funny because the Open function doesn't have a return code.

Upon receiving the exception, I look at the ...

I am testing using a HP Photosmart 7510. On one system, it works correctly on another system, the device will not open. So I guess that this scanner (all-in-one) only kind of works.

Thank you for your reply. It caused me to look more closely at HP's site regarding alternative drivers where I found this statement:

"The 5590 supports duplex (double-sided) ADF scanning, but does not have a duplex switch. Simplex/duplex is selected using a popup window. The popup window is ...

Here you go, I removed the brightness, contrast, and resolutions to save room.

Manufacturer: Hewlett-Packard
Product family: All-in-One
Product name: hp scanjet 5590 #3 TWAIN
TWAIN version: 1.9
TWAIN 2.0 compatible: False
Flatbed present: True
Feeder present: True

Capability: Id=1, Name=XferCount ...

Hello, I have read a post here with a similar problem, but they were using TSScan and were referred to those developers and I could not find a resolution.

We are using an HP Scanjet 5590 scanner with an ADF and with Duplex capabilities. When I run Vintasoft's Advanced Demo against it, the scanner ...