I have one of these. The original USB cable that came with it splits into two - so it draws power from 2 USB ports. There was also a second optional cable with an 5V barrel connector if you only have one USB port. It needs a decent amount of current - not a hub!
According to the manual the scanner only "powers on" when you open the paper feed tray. I assume you were spoofing the sensor by moving the circuit board.
I'vd seen problems like that with a usb powered dvd rewriter where the current is unstable, the device is recognised until it draws extra power to burn a disc. It could well be the voltage from the hub dropping when the motor takes extra power.
Rick, does your USB hub have a socket for power? if it does then it probably did not have enough power for the motor in the device when it was under load? Some hubs need a separate power supply when using devices that need more power.
My guess is, it looks like the circuit board had some small metall breakers on each side. Like the board has to be seated correctly to work!? About the scanning, it looked like the paper you fed it with, was thicker and that it coulden't handle it!?
I see you are a professional, please I need your help, I have hp 27 es and I have vertical lines on the screen, I opened the back and tried to remove the adhesive tape after a black vertical strip appeared on the screen, what is the problem please, I have photos if you can see them and tell me what to do thank you from the bottom of my heart
100% a power issue !!! you need a powered usb hub that gets the power from the wall !!!! the motor starts running and the voltage drops... the internal cpu will detect that and goes in to error state and you get a unknown error warning!!!.
I have even seen Windows pop up warning regarding the USB device pulling too much power. This was when I was using an older powered USB hub that was not capable of spplying 1 Amps. When I plugged in a device into the hub that required more power up came the warning.
I have one of these. The original USB cable that came with it splits into two - so it draws power from 2 USB ports. There was also a second optional cable with an 5V barrel connector if you only have one USB port. It needs a decent amount of current - not a hub!
Yeah it could be that, my hub is only powered from the PC. I've seen those sort of twin USB cbles on external hard drives too
"Can't recognize English text" cracked me up, Richard !
According to the manual the scanner only "powers on" when you open the paper feed tray. I assume you were spoofing the sensor by moving the circuit board.
Very good! Sometimes things "fix itself".. maybe it didn't like your computer? Anyhow, Det' gets a working scanner!
very good
I'vd seen problems like that with a usb powered dvd rewriter where the current is unstable, the device is recognised until it draws extra power to burn a disc. It could well be the voltage from the hub dropping when the motor takes extra power.
Rick, does your USB hub have a socket for power? if it does then it probably did not have enough power for the motor in the device when it was under load?
Some hubs need a separate power supply when using devices that need more power.
It could be that. My hub is only powered from the PC.
12:21 Wow, you got Singapore Cityscape as your wallpaper? 😁 and the L plate sign on the right, i.e. learner driver plate in Singapore.
My guess is, it looks like the circuit board had some small metall breakers on each side. Like the board has to be seated correctly to work!? About the scanning, it looked like the paper you fed it with, was thicker and that it coulden't handle it!?
Reference voltage divider circuit to the motor, driver enable or error comparator. Check the resistors for bad tracks or dry joints guys?.
Paper upside down?
And it wouldn't scan a blank page?
@@LearnElectronicsRepair I have seen some like that
I wonder if it was some driver problems?
Edit: just saw the end with the usb hub yeah that might be why
Heya, some repair are strange I must say that lol
I see you are a professional, please I need your help, I have hp 27 es and I have vertical lines on the screen, I opened the back and tried to remove the adhesive tape after a black vertical strip appeared on the screen, what is the problem please, I have photos if you can see them and tell me what to do thank you from the bottom of my heart
Canon scanners must be controlled by the software, not the button on the scanner.
I wonder what the button is for then and why the scan auto starts when you press it?
100% a power issue !!! you need a powered usb hub that gets the power from the wall !!!! the motor starts running and the voltage drops... the internal cpu will detect that and goes in to error state and you get a unknown error warning!!!.
I have even seen Windows pop up warning regarding the USB device pulling too much power. This was when I was using an older powered USB hub that was not capable of spplying 1 Amps. When I plugged in a device into the hub that required more power up came the warning.
German magic fingers 😂
Made in China?
That's actually micro usb
No. Definately a mini USB.
I said it was a micro USB... 🤐