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I have many years repairing canon scanners so here is my suggestion to you.
First does the scanner power up? If so that's eliminates a internal power supply problem.
Second did anyone change the dip-switch settings on the back of the scanner? Ill assume no on that one.
Third when you first boot up your computer do you see a screen when the computer is in boot up mode that says Adaptec SCSI and then a number? If not here is a couple things to check. First I would check the SCSI cable is good. No bent pins in the connector and no exposed wires coming out of the connector. If you can try swapping a good known working cable with the problem scanner. Second try re seating the SCSI card if that doesn't work do you have another card that you know works that you can swap into the problem computer. After swapping the cable first test to see if the scanner scans, then if you replace the card again retest to see if the scanner scans.
Lastly and I have seen this happen, the drivers may get corrupted if new software is installed that relates to scanning. You may want to google DR 3020 drivers that should pull up Canon's web site and reinstall the drivers. Once you install the latest drivers then reboot the computer and test it to see if it now scans.
Im sure one of my suggestions should correct your problem. I hope this helps you out.
You are right, P30 is not a listed Error. Please reinstall the driver and scanning software again. Run Scandisk to check if the system/OS is ok. May be you can connect the scanner to another Computer and try.
If you are receiving an Error Code 103 or a Paper Jam error,
but there are no pages in the ADF (Automatic Document Feeder), follow
the steps below:
Close the scanning application (such as PaperPort)
Turn off the scanner and the computer
If you have a combination ADF with a Flatbed scanner, unplug the ADF cable from the base of the scanner
Plug the ADF cable back in
Turn on the scanner power
Turn on the computer
Try scanning again
For a Paper Jam or Error Code 103, make sure that the ADF cable in
the rear is connected to the scanner base. Check the flatbed to make
sure that it is clear. A page incorrectly placed on the flatbed may
interfere with a page feeding through the ADF.
If your scanner stops scanning due to a paper jam in the Automatic
Document Feeder (ADF), a warning dialog box appears after a few moments.
To clear a paper jam:
Open the Automatic Document Feeder cover.
Remove the jammed paper and close the cover.
If you are receiving a paper jam error, or if the scanner is
running continuously, check to make sure the paper sensor arm is not
Open the Automatic Document Feeder cover.
Look for the small black plastic arm
When you press on this arm, it should move freely up and down
If the arm is stuck down, please contact Technical Support for troubleshooting options
When you say the error occurs as soon as you press "Scan", is that the button on the scanner, or is it the Scan button inside of Toolbox or ScanGear?
If it is the one on the scanner, try accessing the driver through an application such as Toolbox. If you didn't download that when you got the driver, then go back to the Canon download page and download & install the CanoScan Toolbox. Once that's installed, lauch Toolbox from Start|All Programs|Canon|....look for Toolbox from here. Once you have Toolbox open, click the 'Save' option. Next, check the box that indicates to Use the scanner driver. Click the Scan button at the bottom. This should open ScanGear. Attempt to Preview scan.
Has your scanner been working before?
If so, has anything changed since then such as new printers or other devices added to the computer, or upgraded to a new OS?
Which OS are you using?
When exactly does the error occur?
Does ScanGear open?
Are you able to preview?
Try connecting the USB cable to another port on the computer (directly to the computer...not through a HUB or any other device). Bypassing a hub, which would have to be a powered HUB, or other devices would rule out any issues with those devices.
Ultimately trying the scanner on another computer would rule out issues with the scanner as well.
Which scanner is this? Error (201) usually indicates some sort of power issue...such as the scanner is not getting enough power. If this is a USB powered scanner you may try connecting to different USB ports on the computer.
Try this as a last ditch effort.
Remove the software.
Reboot the computer and come off line.
Disable the Anti Virus program.
Now install the soft ware.
If the red light still flashes then assume it is new scanner time.
while i am trying to scan the images .. i am getting the error code like Code[ffff:0024] while warming up the scanner, besides a sound from the scanner making it power off (light inside the scanner goes off ) so that i could not get scanned anything ... what will be the reason ? please suggest me the trouble shoot kaarthik