Question about HP Scanjet 3300c Flatbed Scanner

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Blown fuse? My scanner was working well and suddenly I plugged in wrong power pack and might have blown a fuse..I looked all over the web and can't get a verification on where it is located. I took apart scanner and see a small fuse that seems to be "locked in" between two fixed posts..I am afraid of bending them to get fuse out but is this what I need to do? Or is there a fuse that is elsewhere inside the unit...I appreciate any feedback on this topic..Dan

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  • Dccusa21 May 13, 2008

    Thanks John...I guess this needs to be sodered as well for fuse to stay in place....much appreciated..Dan


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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

Posted on May 13, 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.
Whatever you decide, best of luck with the scanner.

Thanks for using FixYa, and have a great day!

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Thank you for contacting FixYa.

Please clarify if the error is E8 or some different error. E8 error indicates that SCSI fuse is blown. When 5V, 3.3V fuse is blown, the scanner does not turn on and E8 error is displayed. Check the SCSI fuse status. The SCSI fuse is located in the Control PCA marked as TH2. This alarm is detected during initial processing immediately after power-on.

Probable causes:
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1. Does the same symptom occur after turning OFF and ON the scanner?
To check, press power button of the scanner for more than 2 seconds to turn it OFF, and after more than 2 seconds elapse, press the power button to turn the scanner ON.

2. Check if the SCSI cable or other SCSI devices connected to the scanner cause this error. The scanner can work even after this error occurs. However, to remove this error you may have to replace the Control PCA.

Hope the above information will be helpful.

Please revert if you have further queries.

Thanks & regards,

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There is a fuse. And is soldered ti the power supply board. remove the power supply board and very carefuly heat the end of the fuse connector wire where it pokes through the board while gently pulling it from the other side with a pair of needle nose pliers. you will have to remove the fuse from it's holder to read the amp rating. You can get a replcement fuse from Radio Shack.

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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.

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