Question about HP ScanJet 3970 Flatbed Scanner

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Fuse hp scanner

Where is the fuse located?

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  • Anonymous Oct 11, 2008

    Scanner works OK except for scanning Slides. Should there be a light in the lid of the scanner? I can only get a dark image of the adaptor housing and a black image of the photo. Would much appreciate your advice.





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New Cover fitted and problem resolved,thankyou.

Posted on Oct 19, 2008

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The fuse is located behind the power plug, on the circuit board.

Posted on Oct 19, 2008


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The power to my HP 4400c scanner is not working - just bought a new power cord from HP and still no power. what could be the problem?

Dear Mail472,

We are sorry to hear about your continued issue; even after purchasing a new HP power brick for this scanner.
Sadly, the power brick is only half of the puzzle that provides the full power to this scanner it needs to function. If the unit will not power up on the new brick, then the primary control board inside will need to be examined for a blown fuse or may be dead.
If you are confident enough to open the scanner and check the fuse, unplug the power to the scnner, open it up, and check the fuse. If you would rather; I recommend getting a quote from a local computer store to have the scanner repaired and tested. Or simply purchase a new scanner at a local Retail outlet like Wal-mart, Best Buy, Office Max, or Staples.
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Fuse for hp 3970

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.

Hope this Helps

Apr 03, 2009 | HP scanjet 3970 digital flatbed scanner

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My Hp flatbed scanner has no power, but the fuse is ok.

Some of the HP scanners have a removeable cord like the one on your desktop PC. Check to see if ther'e a loose connection to the scanner end.
Remove and test the fuse or the circuit with an ohmmeter.
If possible, verify power at both ends of the fuse while plugged in.
If there is power through the fuse I'd test the switch. If they are both OK, and power gets through both the fuse and switch, then the unit is likely toast.

Good luck, Jidza

Jan 23, 2009 | Computers & Internet

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HP 4070 Doesn't Power Up

Power requirement per HP specs is 12VDC @ 575mA 6.9w. My scanner and power supply shows 12 VDC @ 1250ma.Over double the power going in that required. No wonder the fuse blows and you have to buy a new scanner because you can't identify or get a replacement fuse. I would suggest you confront HP and have them supply you with a new scanner.

Aug 07, 2008 | HP Scanjet 4070 Flatbed Scanner

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Blown fuse?

hey yes you have got the right idea i have search over the internet that is the right fuse, and this does need to be replace. gd luck

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11 Answers

HP Scanjet 3970 Scanner

The fuse is there to protect the scanner's circuitry in the case that the 12V, 1.25A power source, the transformer, adapter, wall wart, or whatever you wish to call it, goes above the rated values. No higher or lower V or A should make it into the device in order for it to operate within its designed range and fail. Usually there is a slight surge of some sort that blows the fuse caused by a lightening strike near by, static, or any # of other possibilities. The adapter itself is usually weakened over time, rather than the source of this increase. When the adapter goes too low, the scanner will not operate properly and usually windows will stop recognizing it as a usb scanner. At this point the various scanners on the market will give various different reactions that you'll see described in other problems in this forum, but they are all related to a reduction of the input to the scanner resulting in insufficient or erroneous output signals to the computer and windows various responses. Although the fuse is the first point of protection of the scanner circuitry, it isn't needed most of the time if you use a good surge protector to prevent any extraneous voltages from getting into the adapter in the first place. In other words, the surge protector is a 'fuse' for the adaptor, and subsequently, the scanner itself. So my recommendation for those who have equipment that is normally much more difficult and expensive to repair properly, such as a soldered-in, blown fuse (which would be professionally repaired by replacing the entire circuit board rather than just the fuse), is to bypass the fuse with a piece of wire soldered between the two metal end-caps across the top; a very simple, very quick solution. Then use a good surge protector as your 'fuse' to protect the scanner's circuitry. The obvious caveat is that you are taking responsibility for disabling the protection that was originally designed into the scanner to keep the delicate circuitry from failing due to extraneous voltage surges. There is very little risk of fire, but 100% risk of having to have the very same circuit board replaced or buy a new scanner.

Oct 31, 2007 | HP ScanJet 3970 Flatbed Scanner

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