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3. PickUp Head Initial Postion
PickUp Head Initial Postion 1. Move Pick Up Head to inner diretion until pin5 of MJ4="L" 2. If pin5 of MJ4="L", then move Pick Up Head to outer diretion for a short time. 3. Ture On the Laser of Pick Up Head to judge that disc is presence or not.
3
Does Pick Up Move to inner direction?
N
Is pulse of 2.5 +-2.5V developed at pin3,4 of MJ4?
Y
Check connection between PCB and MECHA
N Y Check peripheral circuit of DU3 and MU9 Check BUS line between DU3 and DU5 Check connection between PCB and MECHA
Is pulse of 2.5 +-2.5V developed at pin13 of DU3?
Y
N
Does Pick Up Move to out direction again? Y Does Laser Turn On? N
N
Is pin5 of MJ4 = "L" appeared? Y
Check line between DU3 and MJ4
N
OK
Check voltage at pin17 of RCN1 is about 2.5V? N
Check BUS line between RU1 and DU3,DU3 and DU5
Y
Replace Pick Up Head
Samsung Electronics
9-11
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