Eso junkit error3/23/2023 When you clean the glass, it'll improve the light reflectivity, so may or may not help accroding the light bulb remaining life. At this situation, 2840 will not be able to stablely homing the scanner head-it use reflect light signal(there's a special black area under glass for this purpose) instead a light diode sensor to reduce cost. And in scanner, it's need a certain light temp, that means when the light not bright enough, scanner won't work properly, in scanner the ccfl's life will be counted 20%-50% less than LCD back light. But all CCFL has a life limit(usually 10000hours, that's about year and 2 month). Since there is another cause, major one, the light bulb getting old and not bright enough, this is a design flaw of most HP scanner, the light bulb has been turn on for too long, as default, 2840 will let light remain on 12hours(min you can adjust to 4hours, still too long), pretty much if you use the scanner or fax once a day, it'll be turned on whole day, this is for shorten waiting time for each use of scanner/fax. As others say, open up and clean it may help. This error partially because the reflect mirror and glass are not clean enough. Still thinking about whether I'll ever buy another HP after 20 years recommending them. I spent over a thousand to buy it, over $500 to repair it the first time, and probably more than a thousand in toner and drums. Either fight like hell with HP (multiple calls and letters to Mark Hurd, President), or buy another brand. The scanning software functionality is also pretty useless compared to other, cheaper products. Software installed fine on my laptop, but first I stopped all Symantec services before installing, and that's how I can. Ironically I've never been able to install the software right with either the original or the replacement, so the scanner has never worked with my PC - we (HP and Norton) think Norton prevented some of the install, and the problem is so deep in the bios or wherever the hell it conflicted, I gave up trying a year ago. It's functionally excellent, but highly unreliable. The machine has been discontinued, so don't let HP tell you they aren't having trouble with it. Even though the scanner 5 error came back each time, when I put everything back together, it worked! Who knows for how long. You can hear the gears slipping inside while doing all of this. I 'fiddled" with the scanner on its track while turning the unit off and on, pushing the scanner back and forth against its track. HP is sending yet another scanner unit as a replacement, but while waiting, we had some important docs that had to go out today, so I took the entire top off (lift off the ADF and unplug it, then unscrew all visible screws, pry off keypad, two more screws, lift off glass). Agree this is a design error from my own experience with it. I had to write to the president of HP to get the replacement printer I'm using now. I'm on my second printer, and my third scanner 5 error. Thanks anyway for your advice - my device certainly is frustrating. Yes, even the useless advice (from HP) on the devices display screen to turn device off and then on again (ie.re-boot) is still displayed! The dreaded rattle of the scanning gantry upon start-up in still present and consequently the device ONLY prints (from a computer input -all other functions are impossible). Tried your solution 2 posted on 21/01/08 but without success - my HP2840 all-in one printer /scanner/copier/fax still fails to respond properly.
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