Samsung HT-DM150 Manual page 28

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.
Does Pick Up
Move to inner
Does Pick Up
direction again?
Does Laser Turn
OK
Check voltage at
pin17 of RCN1 is
Check BUS line between RU1 and
DU3,DU3 and DU5
Samsung Electronics
3
direction?
Y
Move to out
Y
On?
N
about 2.5V?
N
N Is pulse of 2.5
+-2.5V developed
at pin3,4 of MJ4?
N
Is pulse of 2.5
+-2.5V developed
at pin13 of DU3?
N
Is pin5 of MJ4 =
"L" appeared?
Y
Check line between DU3
and MJ4
Y
Replace Pick Up Head
Check
Y
connection
between PCB
and MECHA
Check
peripheral
Y
circuit of DU3
and MU9
Check BUS
N
line between
DU3 and DU5
N
Check
connection
between PCB
and MECHA
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