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Let's compare bananas with bananas and apples with apples... if you have the unit ON with some lights and some activity going on, than the POWER CORD is just fine... you seam to refer of a communication problem (not a power problem) from the unit to the computer... normally for HP multi-function devices you have to install a USB cable and the software FIRST than connect the unit when the installer ask you to do so, FIRST UN-INSTALL all drivers & software you installed previously, reboot the computer with the unit OFF, connect the USB cable, than pop in the installation CD, go through the setup (accordingly) than when the installer ask you to connect the unit, turn it ON, than let the installer finish the configuration...
The correct part number for just the "brick style" power module (AC Adapter) for an HP Scanjet 3970 is L1970-80003. It is a specific 12V DC 2 Amp module. Today it can be purchased for $18.06 plus shipping from the HP Parts Store. However, if you are looking for just the power cord to your scanner's AC adapter, this brick style power module AC adapter does require a separate standard C13 detachable power cord to the specifications of your area, for instance, in the USA the power cord to connect the scanner to the power module AC adapter is part number 8120-6260, and it is a common power cord for monitors and computers. I learned all this because I had a scanner error message when I tried to use a different power module on the HP Scanjet 3970 when I lost the power cord to the original module. I hope this info helps somebody else, too.
Most likely cause of the "Scanner could not be initialized" error on the HP Scanjet 3970 is due to using an incorrect power adapter and cord -- the only power module and cord that work for the HP Scanjet 3970 are these part numbers:
8120-6260 for the power cord
and L1970-80003 for the power module / AC adapter
I hope this info helps you.
Sounds simple enough. You will have to do a couple of things in order here. Unplug the cable from the back of the computer, and the scanner itself. Then unplug the power cord from the wall for the scanner. Wait about 20-30 seconds, then plug the scanner back into the wall. Now plug the cable in to the scanner, then the computer. Turn on the scanner and it should work. If by chance this does not work, then you may have to reinstall the drivers. If you don't have the disc, check out the manufacturer websight support section. Good luck
After you have UnScrewed and Opened Up the Scanner. On the Circuit Board (Green Board with Electronic Components) just where you Plug in the Power Pin there is a Small Glass Tube Looking Component. You need to replace that with a 1.2mA Fuse.