Re: Issue with an old Star LC-10 dot matrix printer
The "print-head-moves to right, moves back to the left" thing is a standard initialisation behaviour for many printers - it's setting a left-hand 'zero' position and checking that whatever mechanism is used to determine print-head-position [probably an optical-chopper wheel for the relative/incremental steps, and a diode/phototransistor for the absolute-left-hand-extreme] is working.
Given that you say you've not had this printer working before, I'd check for accumulated crud [fibres from paper, spiders-webs, general dust] in the printhead position-sensors. A quick blast with a compresed-aor-duster might help.
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