Star SM-S301 Hardware Manual page 14

u Press FEED button twice, Power lamp twinkles six times and Error lamp
twinkles twice.
g Press MODE button once, Error lamp twinkles three times.
(The density has set to high.)
If all the mode have set, press the FEED button and the MODE button at the same
time after then release the buttons at the same time.
The printer will print out the mode status which has modified.
(RS-232C/9600 bps/7 Data bit/Even Parity/1 stop bit/Density High)
If the status is not correct, please try it again according to the procedure.
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