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I presume this is a scanner that uses a USB connection to your computer. You will find that it does just about nothing until you have it connected both to power and to a computer's USB port. You must also install the appropriate drivers and software. Only then will your computer activate the scanner when you actually try to scan something. The only thing that will activate with only the power cord connected is the scanning lamp inside it so lift the lid and connect the power cord. If the lamp comes on but nothing else, it's just doing what it's supposed to do.
First get a multimeter and check if the power is going through the adapter to the end of the cord. The AC/DC transformer should output 32V DC at the end going into the scanner. If it has power, then the scanner power switch or the unit itself has failed. If there is no power passing through the cord, then try a new adapter. (You can find some by Googling - I saw some from various vendors.) If it is the scanner itself that has failed, check if it is under warranty.
If it is under warranty, contact HP for service. They may have the power cords as well but I didn't check that far. Otherwise decide if it is worth the service charges.
I hope this helps.
Cindy Wells (at least I do not think this scanner has a hard power switch on the side of the unit.)
Check that the power socket switch is on
Make sure your scanner's power cord is securely connected to the scanner and a working electrical outlet.
If your scanner is supplied with a power adapter, make sure
your scanner's AC adapter is securely connected to the scanner and a
working electrical outlet.
Make sure that the power outlet works. (If necessary, test it by plugging in another electrical device and turning it on.)
Check that the power switch is on at the mains socket. If this
is on, carefully check the power cable to ensure it is not damaged and
remove then reseat it before attempting to turn the scanner on again. If
your scanner has a power button, make sure that the button is depressed
so it is turned on. Also, make sure that your outlet works and is not
controlled by a wall switch or timer.
Power off the scanner at the mains socket. Unplug the power
cable from the socket, then remove and reseat the power cable from the
scanner's power cable port. Plug the scanner back in at the mains and
ensure the socket is switched on.
If your scanner has a power button, does the power button depress when pressed?
Press down firmly on the power button, if it is stiff and does not depress then there may be a problem with the button.
Connect the scanner directly to the mains - not via a surge protector or extension lead.
If your unit is connected via a surge protector or a power strip/extension lead, connect the unit directly to the mains socket.
Try another suitable power cable.
Check that other electronic devices connected to same power socket
have power and try another mains socket and another power cable if
necessary. Failing this try another suitable and known-working power
cable. Depending on your scanner, a standard "kettle lead" or "figure of
eight" power cable is used. If there is power to the scanner (indicated
by an illuminated Start light), when a different power cable is used, then the fault is with the original power cable.
If the unit does not power on after following the checks above,
contact Epson for support. If your scanner uses an AC adapter, then this
may need to be replaced. If your scanner is over 12 months old, you can
purchase a replacement AC adapter directly from Epson.
turned off machine. Unplugged computer connection,disconnected power cord from source. replugged computer line, installed power cord, turned machine back on. worked..... turning on/off at switch did not work.
it is always handy to state the brand and the type of connection when referring a fault. if its USB the check in ctrl panel DEVICE MANAGER if there is a yellow exclamation mark. same for serial ...against the scanner
if this exclamation is there it means that it does not recognise the scanner and will need to be reinstalled. check that the serial plug is on firmly, both at scanner and computer, dont just look... undo and reseat on both. Ensure the POWER plug is connected firmly and that it IS switched on.. try something else in that plug and see if it works.
simple things are often overlooked and users thinking technicians are just stupid to ask these questions, but 9/10 it is the simple thing that causes the problem.
The fuse for Duoscan T1200 is "T2A 250V" a 2 Ampere 250 Volts. The letter "T" means the fuse is "Slow Action". European size ? 5 mm. x 20 mm. length. The cilinder is "Ceramic" in white color, not in transparent glass like comun ones.
Try to test the power cord of the scanner (cable from scanner to outlet) using multitester if there is an electricity or if you have extra power cord test it. Maybe that's the defect. If that's not the problem it is now the scanner itself, have it for the repair man or technician.
I know this sounds stupid, but did you make sure to switch the power switch to the ON position? When the power is connected, and then you flip the power switch on, the light inside the scanner will illuminate, possibly briefly but noticeable. If that doesn't happen, then you're not getting power. Try different outlets. Re-secure power cord connection. If still no power, then I suggest to contact Canon (techsupport) for another power cable.
First of all, use a lamp, fan or something to check your electrical outlets. Make sure they are not on a switched circuit, or a power strip that may be turned off. Try unplugging the cord from the scanner and re-inserting it. I don't know if there is a fuse inside the 5470, but I would bet on it. If all else fails and you feel competent to try it, see if you can disassemble the bottom and look for the fuse. Usually sudden problems like this are really something simple (or catastrophic!! :-) Good luck, John