I was wondering if anyone has experience with flat bed scanners, the light remains on and when I can get it to scan the image is black, any info appreciated.
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Re: HP scanjet
Is this new to you or was it working and then quit?
Are the mechanicals making the pass?
If you are leaving the cover open with nothing there that could do a black image.
Light has to reflect back to the sensor or you get black.
.Mann-Made Global Warming.
- We should be more concerned about the Intellectual Climate.
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Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
- Dr Seuss
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You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
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Re: HP scanjet
No the scaner was given to me with the problem.
Mechanicaly it makes the pass using the windows configuration but resolution is black so I installed HP's full software version and now it just gives an error mesage telling me to unplug and check all connections which are fine!Comment
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Re: HP scanjet
Well,
You have the sensor that picks up the reflection.
Some circuitry that converts that into a signal for the PC.
Interconnecting cables inside the box.
The inside to outside connection.
The cable to the PC outside the box.
And the actual connection to the PC.
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Suggest you first open it up and look for obvious things [loose wires, bad caps, burned things, bent cable pins] and while in there take a few snap-shots of the electronics board[s] to post.
What is the model number?
.Mann-Made Global Warming.
- We should be more concerned about the Intellectual Climate.
-
Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
- Dr Seuss
-
You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
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Comment
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Re: HP scanjet
Well I opened it up and took a few pictures of the boards and a part from the scan beam staying on it does not make a full sweep only a few inches and returns.
Strangely windows see this hardware and reports its working fine but the HP software does not see it and reports communication errors. win Xp crashed a few times when stating the scaner.
The model in question is HP G2710 flat bed.Attached FilesComment
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Re: HP scanjet
:feedback A little feed back wouod be nice even if I was late to reply! Or should I just scrap it??Comment
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Re: HP scanjet
The fact it's not doing a full sweep suggests to me there is an actual problem in the machine. [Not just a driver/software issue.]
Possibly a bad sensor or limit switch kind of thing or the drive mechanism is slipping.
.
I did have one with a slipping drive problem. That was WAY back though.
If I remember correctly a plastic gear was stripped on one side due to poor engagement [it had slipped on the shaft] and I fixed it by reversing the gear to give it better teeth.
.
I haven't worked on a heck of a lot of these.
Was hoping someone that has would find the thread by now.
.Mann-Made Global Warming.
- We should be more concerned about the Intellectual Climate.
-
Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
- Dr Seuss
-
You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
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Comment
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Re: HP scanjet
No worries its just a piece of equipment that if I can't fix it I'll trash it, anyhow checked the motor and gears out and they all seem good, I notice though when I connect the USB it crashes the computer or I get a message that theres a problem with the communications therefore I think its a USB problem, I also disconnected the negative scanner thats under the lid incase the lamp was blowen but still the same. Not sure now what to do!Comment
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Re: HP scanjet
Follow [trace] the USB lines into the PCB and see if there's something there that's shorted.
Or maybe an IC that looks like it go hot.
.Last edited by PCBONEZ; 12-07-2011, 07:40 AM.Mann-Made Global Warming.
- We should be more concerned about the Intellectual Climate.
-
Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
- Dr Seuss
-
You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
-
Comment
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Re: HP scanjet
For that matter check the 'pins' in the ends of the USB cable and the ports on the PC & scanner.
[As applicable..]
.
And if it isn't a hard wired cable try a different one. [Shorter is better for this.]
.Last edited by PCBONEZ; 12-07-2011, 07:45 AM.Mann-Made Global Warming.
- We should be more concerned about the Intellectual Climate.
-
Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
- Dr Seuss
-
You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
-
Comment
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Re: HP scanjet
Looking again at your pics.
There are two caps in pic #1 at lower right with Y vents that look a bit puffy.
Just slightly - like they are just beginning to bloat.
.
This might turn out to be a caps problem....
.Mann-Made Global Warming.
- We should be more concerned about the Intellectual Climate.
-
Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
- Dr Seuss
-
You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
-
Comment
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Re: HP scanjet
I have two ScanJets and they are totally plug and play under XP. Even the Scanner and Camera Wizard happily uses them fine.
HP's support however seems to be the breaking point. Their drivers immediately took usage rights away from everything but HP's own scanning utility which also limited the scanning resolutions on me.
Try uninstalling the HP software and drivers and seeing if Windows on its own will work with the scanner.Find Nedry!
Check the Vending machines!!
<----Computer says I need more beer.Comment
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Re: HP scanjet
How is the power brick?
I just had a LaCie external drive fail because of lumpy 12v coming from the power brick. It wasn't even necessary to scope it.... my DMM reading was fluctuating all over.
Cutting it apart and replacing the bad Samxon caps inside fixed it.The More You Learn The Less You Know!Comment
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Re: HP scanjet
I will try uninstalling HP's software as I also feel theres a glitch there some where I wanted to use it as it saves docs in pdf, I tested all the caps including ones you mentioned but they seem okay. The power supply could also be a factor to check out, the system says 12V but its only getting 9V!Comment
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Re: HP scanjet
Is it 9v when not connected? [That would be the brick for sure.]
If 12v alone and 9v when connected there could still be a partial short in the box pulling the volts down.
.Mann-Made Global Warming.
- We should be more concerned about the Intellectual Climate.
-
Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
- Dr Seuss
-
You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
-
Comment
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Re: HP scanjet
caps are open in that brick.it drops off under the load of the motor.Comment
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