I was just wondering whether anyone might be able to help me with a bit of troubleshooting? I've just very excitedly unboxed my new tiny thermal receipt printer, and connected it up to my raspberry pi zero via USB, but for whatever reason it doesn't seem to be working.
I have successfully been able to print the test page, so the printer is working. I have noticed that the light on the printer is emitting a consistent red flash, but I'm not sure what the significance of that is.
For reference, in case it's a power issue, I'm running the system off a 9v 5a DC brick into a splitter - with a step-down converter to go into the pi of course.
I've been following the instructions at https://learn.adafruit.com/networked-th ... re-printer and got as far as running the test print on the USB printer, and that's where I got stuck.
I ran
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ls -l /dev/usb/lp0
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bash: echo: write error: Input/output error