Mini Thermal Printer Issue
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Mini Thermal Printer Issue

by bmock on Tue Dec 25, 2012 7:35 pm

Hello all,

I have an issue with the mini thermal printer. I can successfully push things to the printer to print, but they come out faded in spots and in garbled characters. When I power on the printer while holding the feed button it just prints CP437 repeatedly on new lines. It doesn't print anything else, just CP437 until I let go of the button. Is there a firmware update I'm missing or is it a faulty printer? Maybe some other issue?
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Re: Mini Thermal Printer Issue

by pburgess on Tue Dec 25, 2012 8:12 pm

Possibly printer or power supply related. What are you using to power the printer?
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Re: Mini Thermal Printer Issue

by bmock on Tue Dec 25, 2012 8:21 pm

I bought the starter pack, so it is the 5v adapter. I also had the usb plugged in while printing.
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Re: Mini Thermal Printer Issue

by pburgess on Tue Dec 25, 2012 9:33 pm

Okay. Let's start by removing the Arduino from the equation. Disconnect it from the printer, then hold the feed button while connecting power to the printer. Does it still print the CP437 message in a loop, or does it print the character map?
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Re: Mini Thermal Printer Issue

by bmock on Wed Dec 26, 2012 1:48 pm

Without the arduino plugged in and just power while holding down the button it rhythmically advances the paper but prints nothing. When I put the arduino back in it printed the same CP437 repeatedly.
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Re: Mini Thermal Printer Issue

by pburgess on Wed Dec 26, 2012 2:21 pm

Is that with the button held when connecting power, or pressing it after the fact?
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Re: Mini Thermal Printer Issue

by bmock on Wed Dec 26, 2012 3:37 pm

with it held while giving it power.
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Re: Mini Thermal Printer Issue

by pburgess on Wed Dec 26, 2012 7:16 pm

Okay, that's just wonky. Please email support@adafruit.com and include a link to this post, and we'll issue a replacement.

Thanks for your patience, just wanted to rule out other possibilities first.
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Re: Mini Thermal Printer Issue

by bmock on Thu Dec 27, 2012 2:12 pm

Thanks for the help!
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Re: Mini Thermal Printer Issue

by bogohack on Tue Jan 29, 2013 9:04 am

Hi, im having the exact same problem, and i made the same tests suggested, how can i solve this problem?
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Re: Mini Thermal Printer Issue

by adafruit_support_bill on Tue Jan 29, 2013 11:49 am

i made the same tests suggested

What did you try and what were the results of those tests?
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Re: Mini Thermal Printer Issue

by bogohack on Tue Jan 29, 2013 12:42 pm

I unpluged the printer from everything, then i press the feed button, then i pluged to my 5V-2A adapter and it started printing CP437 on an on, then i released the feed button and it stoped printing and that was it, every time i try this is the same result.
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Re: Mini Thermal Printer Issue

by adafruit_support_bill on Tue Jan 29, 2013 1:07 pm

OK then. Contact support@adafruit.com for a replacement printer. Be sure to include a link to this thread.
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Re: Mini Thermal Printer Issue

by MiniatureTigers on Fri Feb 01, 2013 10:39 am

I had this happen when I forgot to press the “ON” button from the printer. As a result it was only powered from the Arduino's USB and didn't have enough juice to print. Maybe that's what's happening?
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Re: Mini Thermal Printer Issue

by jbarrera on Thu Dec 05, 2013 11:29 am

Hi! I'm having the same problem. Everything is unplugged from the printer, and when I power it up after pressing the feed button, it just prints CP437 repeatedly. I'm using a 5V 2A adapter. Should I email Adafruit's support too?
Thank you!
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