I haven't got this printer but I found some trick:
This device doesn't support ESC protokol, so don't use copy of EPECSP9. Try to use IBM PPDS emulation.
This device support turkish characters with set 2 (http://images.lexmark.com/publications/pdfs/2007/4227-4227plus/en/4227ug.pdf page 40). Detail of character sets given here http://www.compuprint.com/docs/archive/e9070p.pdf
Use Postscript with PPDS driver Dot Matrix Printer for SapScript
How are you connect printer to sap server? With print server over network? May be print server has issue. Make your test with direct connection (parallel/serial).