NEC NP3151W - Manual (Page 97)

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6. Using On-Screen Menu
[IMAGE OPTIONS]
Adjusting Clock and phase [CLOCK/phASE]
This allows you to manually adjust CLOCK and PHASE.
CLOCK.................... Use.this.item.to.fine.tune.the.computer.image.or.to.remove.any.vertical.banding.that.might.appear..This.
function.adjusts.the.clock.frequencies.that.eliminate.the.horizontal.banding.in.the.image.
This.adjustment.may.be.necessary.when.you.connect.your.computer.for.the.first.time.
PHASE.................... Use.this.item.to.adjust.the.clock.phase.or.to.reduce.video.noise,.dot.interference.or.cross.talk..(This.is.
evident.when.part.of.your.image.appears.to.be.shimmering.)
Use.[PHASE].only.after.the.[CLOCK].is.complete.