Question about HP Scanjet 4300c Flatbed Scanner
On my scanner the pc data cable seems to come loose which makes for intermittent disconnects just like you had. It also does a thing where if you don't use it for even a short period it goes into whats best described as a sleep mode. This almost always requires it be unplugged and plugged back in before it is recognised again. I have a feeling from your description that what you are seeing could be a variation of one of these. The scanner works just fine but it does these annoying things.
As its a scanner there isn't much (almost nothing) we can check or adjust. You can check the data and power cables. Gently give them a wiggle and see if you can get the scanner to nod off again. Usually the problem will be the computer end of the data cable or the scanner power plug or jack. These may be loose or worn and making intermittent contact if moved bumped or vibrated. If you experience more power outages than it seeming to be asleep then the power jack could be loose or the wire inside the power cable may have been damaged. If the wire is damaged you may be able to find where by wiggling the wire. Sometimes you will see a bend where it should be straight. If you don't the problem is usually by the plug end. If you can confirm the problem is the power wire then you can just replace it.
As far as bulb replacement, there shouldn't be any user serviceable parts. The light source inside is a series of leds on the scan bar. These create that light greenish light (most models) as it scans. It should show an error if there is a light problem. You can check by watching the light leakage as it scans. If there is light you are ok, reduced light should just mean darker scan images.
It is possible you have a drive motor issue that is causing excess power use and overheating. If you have used it a lot the guide tracks will wear or get dirty and cause extra friction and the little motor has to work harder and harder until it fails. You could possibly (really doesn't sound like it though) be seeing the early failure of the motor. Unfortunately if there is a serious hardware problem it is almost never worth fixing a scanner. It is much cheaper to replace it. My bet is you are seeing a cable issue.
Posted on Oct 24, 2010
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Posted on Jan 02, 2017
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