Anyone has schematic of ANY printer with USB port ?

[Externet]

Hi.
If you have a schematic of ANY printer with USB port; can you please check if 5V is provided at its jack ?

 

[Harald Kapp]

I don't have a schematic, but I think it is unlikely that 5 V are present at the printer's USB port as the printer is a USB device. Only USB hosts provide power to USN devices, not vice versa.

Power on a USB port will be available if the printer has a USB port to handke e.g. USB sticks to print directly from stick etc. In that case the printer is the host.

 

[Externet]

Thanks, Harald. You are confirming what I thought.
But this gadget makes me scratch my head :
----> http://www.actisys.com/Documents/Spec_BT5900US.pdf
I asked the manufacturer; hope will get a reply on how is it powered...

 

[Harald Kapp]

The list of known compatible printers is surprisingly (?) rather small.

Follow your link, goto page 2 and look under "Power": a separate power adapter is required (and should be supplied with the USB dongle). That's where it gets power from, not from the USB port.

 

[Externet]

Thanks. Missed that on the linked page. Previously I looked at another information page about the gadget. Found two more brands for the same application, also belly up, unobtanium.
I believed a plain wifi dongle fed with 5V at the printer port should do the bridging...