Question about Canon PIXMA MP150 All-In-One InkJet Printer

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TWAIN error I am receiving a TWAIN error when I attempt to scan a picture. The error message states that the device may not be plugged in, but I double checked and it is plugged in??

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Here is an actual e-mail from a Canon tech regarding this problem:

Thank you for your recent enquiry regarding your Canon product

Please accept my apologies for the delay in contacting you regarding the
problems you have been experiencing with your CanoScan D646U.

I shall firstly answer your query regarding the TWAIN drivers. There are four
main TWAIN files that are pre-installed with Windows, TWAIN.DLL, TWAIN_32.DLL,
TWUNK_16.EXE and TWUNK_32.EXE. These are included with the scanner drivers to
ensure that a compatible version of the files are installed, otherwise the
scanner will not work. During installation these files are checked for and, if
a later version is already installed, the versions from the disk will not be
installed. I can assure you that the scanner driver will work OK with version
1.7 of the TWAIN drivers.

For the scanner to communicate correctly the Still Image Services needs to be
running in the background. To check this please open the Control Panel and look
under Services in Admin Tools. Please check to ensure that the Still Image
Service is running correctly.

If all this is OK, I would recommend removing the driver in the following way.
With the scanner still connected go to Device Manager. Under Imaging Devices
right click on the CanoScan D660U and select uninstall. After this please
disconnect your scanners USB lead and remove the rest of the driver using the
DELDRV utility. Before reinstalling the driver you must restart your PC and
then reconnect the scanner.

If there are still problems please check that the driver has installed
correctly. The following files should be shown in the driver section when you
look at the scanner properties in Device Manager.


All of the files mentioned above that are listed as being in the TWAIN_32\D64U
folder are the exact files that should appear in that folder if you look in
Windows Explorer.

A further cause of the TWAIN error occurring is if there is a conflict with
another TWAIN compliant device, such as a Digital Camera or scanning device
(including Multifunctional devices. If you have such a device installed try
removing its software before reinstalling the scanner driver.

We hope this information is of use to you. However, should you require any
further technical assistance, please do not hesitate to contact us quoting your
Incident number.

To contact us via email, click on the following link:

Note: Please do not reply to this email using your 'REPLY' tab.

Kind Regards,

Gavin O’Mahony
Product Support Specialist

Posted on Oct 27, 2007


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Scanning a document is the same as scanning a picture, it must be done from within the document app. In this case I'm assuming you are using Microsoft Word.

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Initialization failed - Unable to acquire TWAIN-compliant device



I have seen your message stating that "Initialization failed - Unable to acquire TWAIN-compliant device" error is received when trying to connect USB-Parallel type to your Laptop.


Well,  Printer  Panasonic UF4100, recommends to use only " Printer/Scanner Interface as Bi-directional Parallel (IEEE1284) " means you need to use Parallel cable to connect Printer to the Computer/Notebook.  You may receive some communication error messages if you are using a  "PORT REPLICATOR CABLE"( USB TO PARALLEL connector).  The error message that you have received is related to the communication error. Futher, if you use same USB- Parallel cable for long time the Printer Hardware functionality might go bad, since Printer memory gets confused and will not read or detect the Cable , since it is not a cable to use  mentioned by Panasonic Manufacturer.


Let me tell you, general functionality of Printer like Printing would work even if you use USB-Parallel cable. But it is not a case with Scanner and Fax functionality.


Hence, I recommend you to use only Parallel cable to connect your Printer to the Laptops.


I hope that this will resolve the issue for you.


You can email me at if you need further assistance.



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