Font problem on Zebra 2824 printers

I wrote code that outputs ZPL and sends it to Zebra printers - both are model Zebra 2824.  Both were purchased used.

One printer prints the label beautifully in a TrueType font.  The other printer renders the same ZPL in blocky oversized letters.   Does anyone have any suggestions?

Sample ZPL below:
^XA
^FT30,755^A@B,30,28,TT0003M_^FH\^CI17^F8
^FDItem Number: 205-000004-003^FS^CI0
^FDExpiration Date: 05/31/18^FS^CI0
^FT420,755^A@B,30,28,TT0003M_^FH\^CI17^F8
^B3B,N,60,Y,N^FDC200002^FS^CI0
^PQ4,0,1,Y^XZ


I have checked:
1. The printer set up (Red Hat Linux) is identical
2. The printers are the same model (Zebra 2824)
3. The printers have the same fonts installed (Printed the font list from each and the output is identical)

What else might I be missing?   Any advice would be greatly appreciated.

-Dan
Dan PackerAsked:
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Dr. KlahnPrincipal Software EngineerCommented:
Have the printers print their test pages and see if the firmware revisions are identical.
fred hakimRetired ITCommented:
Some older firmware had issues with command frequency over USB.  (Couldn't handle too many commands too fast).  You can get the latest firmware and drivers from Zebra...

See:  https://www.zebra.com/us/en/support-downloads/printers/desktop/lp-2824.html
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