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Why isn't my scanner being recognized?
Posted by: freeradical
Date: September 04, 2015 10:30AM
I get the following error message when I try to use my scanner:




I have tried unplugging and replugging the USB cables at both ends.

I have moved the scanner's connection from a USB hub to a direct connection to the iMac, and on a completely different port from the one the USB hub is using.

The scanner uses some sort of proprietary cable with some kind of barrel like thing (An EMI Filter ?) at the end of the cable, so I haven't tried swapping cables.

I have rebooted the scanner software.

I have shutdown and restarted the scanner.



Does anyone have any other ideas?

Thanks
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Re: Why isn't my scanner being recognized?
Posted by: MrNoBody
Date: September 04, 2015 10:35AM
a little more info please:
brand & model?
external or USB powered?



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Re: Why isn't my scanner being recognized?
Posted by: mstudio
Date: September 04, 2015 10:37AM
Have you tried Image Capture to see if it can recognize the scanner? My scanners stopped working with the latest OS update. I use Image Capture now.

You'll at least know if it's software or hardware related.
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Re: Why isn't my scanner being recognized?
Posted by: freeradical
Date: September 04, 2015 10:38AM
It's an Canon 9000F, and the power source and USB cable are separate connections. The scanner is powering on.
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Re: Why isn't my scanner being recognized?
Posted by: freeradical
Date: September 04, 2015 10:38AM
What is image capture?
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Re: Why isn't my scanner being recognized?
Posted by: space-time
Date: September 04, 2015 11:21AM
try a different USB cable. forget about that little thing on the cable, if you have a cable that fits, try it. My dad had a bad cable and he insisted the cable is good and drove me crazy troubleshooting (remotely), until I sent him in the basement looking for a different cable and then printer/scanner worked ever since.
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Re: Why isn't my scanner being recognized?
Posted by: Mike Johnson
Date: September 04, 2015 11:23AM
Image Capture is a utility that comes with OS X. It should be in your applications folder.

Try changing the cable. The little barrel thingy is nice but hardly necessary.
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Re: Why isn't my scanner being recognized?
Posted by: space-time
Date: September 04, 2015 11:23AM
Quote
freeradical
What is image capture?

is this a serious question?

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Re: Why isn't my scanner being recognized?
Posted by: ahs
Date: September 04, 2015 11:42AM
I agree with space-time. Try a new USB cable. If the scanner wasn't recognized when you connected it directly to the computer. the cable must be at fault.
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Re: Why isn't my scanner being recognized?
Posted by: N-OS X-tasy!
Date: September 04, 2015 11:47AM
Quote
ahs
I agree with space-time. Try a new USB cable. If the scanner wasn't recognized when you connected it directly to the computer. the cable must be at fault.

Well, it could be that the USB port on the scanner went bad.



It is what it is.
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Re: Why isn't my scanner being recognized?
Posted by: NewtonMP2100
Date: September 04, 2015 11:53AM
......is it a SCANNER........Darkly.....???



_____________________________________

I reject your reality and substitute my own!
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Re: Why isn't my scanner being recognized?
Posted by: STL
Date: September 04, 2015 01:15PM
Check System Profiler > USB to see what Mac recognizes being connected via USB
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Re: Why isn't my scanner being recognized?
Posted by: freeradical
Date: September 04, 2015 03:12PM
Okay, I replaced the cable and it didn't matter. So I decided to reboot the iMac. Now the scanner is recognized. I then replaced the original cable, and it works too.

banghead smiley
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Re: Why isn't my scanner being recognized?
Posted by: N-OS X-tasy!
Date: September 04, 2015 04:27PM
A Computer Troubleshooter's Manual
1. Check to see that the non-functional device is plugged in.
2. Reboot the computer to see if that fixes the problem.
3. Everything else.



It is what it is.
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Re: Why isn't my scanner being recognized?
Posted by: freeradical
Date: September 04, 2015 06:13PM
Quote
N-OS X-tasy!
A Computer Troubleshooter's Manual
1. Check to see that the non-functional device is plugged in.
2. Reboot the computer to see if that fixes the problem.
3. Everything else.

True, but I hate not knowing why something happened. Imagine if the lights on your car were to occasionally fail for seemingly no reason. You discover that shutting down the engine and then turning it back on "solves" the problem. Most people would want to know what's up. :-)
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Re: Why isn't my scanner being recognized?
Posted by: N-OS X-tasy!
Date: September 04, 2015 06:45PM
Quote
freeradical
Quote
N-OS X-tasy!
A Computer Troubleshooter's Manual
1. Check to see that the non-functional device is plugged in.
2. Reboot the computer to see if that fixes the problem.
3. Everything else.

True, but I hate not knowing why something happened.

I used to be the same way, but then I started to provide support for Windows. Broke that habit right quick.



It is what it is.
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Re: Why isn't my scanner being recognized?
Posted by: MrNoBody
Date: September 04, 2015 07:28PM
Quote
freeradical
...
True, but I hate not knowing why something happened. Imagine if the lights on your car were to occasionally fail for seemingly no reason. You discover that shutting down the engine and then turning it back on "solves" the problem. Most people would want to know what's up. :-)

It may have been a process 'stepped' on the memory space for one of the several USB extensions. Since the kexts are loaded from the extensions.mkext compressed kext cache, the system wouldn't reload the terminated kext.
Rebooting is the usual solution. Poorly written code; Adobe Flash comes to mind,
are typically the cause.

Apple's engineers work full time to isolate and correct these issues.
If you really want to "know why" it happens, there's a lot of info on Apple's Developer pages.



39°36'17"N 75°44'43"W

The search engine that doesn't track you.

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