# Mini Thermal Printer doesn't accept printing parameter commands

**URL:** <https://forums.pimoroni.com/t/mini-thermal-printer-doesnt-accept-printing-parameter-commands/10846>\
**Category:** Support\
**Created:** [July 3, 2019, 10:37pm UTC](https://forums.pimoroni.com/t/mini-thermal-printer-doesnt-accept-printing-parameter-commands/10846 "2019-07-03T22:37:19Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![ryansuchocki](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/ryansuchocki/32/5581_2.png) [@ryansuchocki](https://forums.pimoroni.com/u/ryansuchocki)\
**Post date:** [July 3, 2019, 10:37pm UTC](https://forums.pimoroni.com/t/mini-thermal-printer-doesnt-accept-printing-parameter-commands/10846/1 "2019-07-03T22:37:19Z")

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My ‘mini thermal printer’ doesn’t seem to accept the ‘Control Parameter Commands’ described in section 5.2.9 of the manual on the product page.

Specifically, the sequences ‘ESC 7 n1 n2 n3’ and ‘DC2 # n’ do not have the expected effect (changing the print speed/density), and the printer prints out ASCII characters corresponding to whatever values I used for n1, n2, n3 etc.

Are pimoroni able to provide a reference for the command set actually supported by this printer?

The firmware version printed by the self-test is “GV2.16.08 20180627\_R”.

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**Author:** ![Orwyn](https://avatars.discourse-cdn.com/v4/letter/o/e0b2c6/32.png) [@Orwyn](https://forums.pimoroni.com/u/Orwyn)\
**Post date:** [August 17, 2019, 1:39pm UTC](https://forums.pimoroni.com/t/mini-thermal-printer-doesnt-accept-printing-parameter-commands/10846/2 "2019-08-17T13:39:11Z")

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Same for me, see my Post for a picture.

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**Author:** ![Orwyn](https://avatars.discourse-cdn.com/v4/letter/o/e0b2c6/32.png) [@Orwyn](https://forums.pimoroni.com/u/Orwyn)\
**Post date:** [August 25, 2019, 9:16am UTC](https://forums.pimoroni.com/t/mini-thermal-printer-doesnt-accept-printing-parameter-commands/10846/3 "2019-08-25T09:16:53Z")

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Did you get any Information?  
Or did you send back the printer ?

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<div class="post-metadata">

**Author:** ![ryansuchocki](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/ryansuchocki/32/5581_2.png) [@ryansuchocki](https://forums.pimoroni.com/u/ryansuchocki)\
**Post date:** [August 25, 2019, 10:04am UTC](https://forums.pimoroni.com/t/mini-thermal-printer-doesnt-accept-printing-parameter-commands/10846/4 "2019-08-25T10:04:35Z")

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Hi. I’m disappointed to say that I haven’t had any information from pimoroni about this.

For my own purposes, I’ve found that with a good ~4A 5V supply, the printer works well and I haven’t worried about the missing commands. I guess it’s possible that the manufacturer has removed the configuration command (possibly because they think they’ve perfected auto compensation)…

I did try using a hefty 9V supply as well, but this caused the paper to feed so quickly that the print head had trouble keeping up and the density was much lower.

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**Author:** ![Orwyn](https://avatars.discourse-cdn.com/v4/letter/o/e0b2c6/32.png) [@Orwyn](https://forums.pimoroni.com/u/Orwyn)\
**Post date:** [August 28, 2019, 4:55pm UTC](https://forums.pimoroni.com/t/mini-thermal-printer-doesnt-accept-printing-parameter-commands/10846/5 "2019-08-28T16:55:24Z")

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Hi,

I contacted Pimoroni support via Mail an got a solution, my first unit seems to be defective.  
See: [Mini Thermal Printer missing pixels dull printing](https://forums.pimoroni.com/t/mini-thermal-printer-missing-pixels-dull-printing/11336)  
Perhaps Pirmoroni would accept a replace in your case too due to the posting in this forum ?