Ops Manual

Question on Acer DVD Drive 2-12-2007?
My daughter’s computer (eMachines T1855, Windows ME) has dvd drive (acer DVP1648A). The player has an adjustment knob on the front left side. What does this knob do? I do not have ops manual. Have been having some trouble reading disks, wondering if adjustment knob will help. Thanks for your response!
its probably a volume control for playing cds … if theres disk reading problems it could be the drive is dirty or needs a firmware update …
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