Page 1
Samsung Electronics 9-1
9.TroubleShooting
9-1-1 Main; HT-DM150
Page 2
9-2 Samsung Electronics
Page 3
Samsung Electronics 9-3
Page 4
9-4 Samsung Electronics
Page 5
Samsung Electronics 9-5
9-1-2 Main; HT-DM550
Page 6
9-6 Samsung Electronics
Page 7
Samsung Electronics 9-7
Page 8
9-8 Samsung Electronics
Page 9
Samsung Electronics 9-9
9-2 DVD Frontend par ts
1. Initial operation after power ON
POWER ON
3
4
Disc presence/absense judgement
DVD single or
Dual layer judgement
Is Tray closed?
Y
Pick up head intial position.
Disc presence
Y
CD or DVD judgement
DVD
N
CD
Tray close operation.
about 3sec.
N
Y
Wait Open Command from MPEG
N
Is Tray closed?
Stop Close operation.
Laser Off
Monitor Display=NO DISC
CD or CDRW
judgement
Single
DVD single
initial setting
DVD Dual
initial setting
To Each disc playback
CDDual
CD
initial setting
CDRW
CDRW
initial setting
Page 10
9-10 Samsung Electronics
2. Play operation
Play
5
Disc Motor forced accelleration
Repeat
seveal times
Change
Disc Type
Focus Seach
Is focus servo
on?
Track servo ON
CLV servo ON
6
7
8
Automatic Adjustment
Automatic Adjustment is done once
when the disc is replaced
Read TOC
Search --> Picture appeares
Page 11
Samsung Electronics 9-11
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
OK
Does Pick Up
Move to inner
direction?
Y
Does Pick Up
Move to out
direction again?
Y
Does Laser Turn
On?
NY
Is pulse of 2.5
+-2.5V developed
at pin3,4 of MJ4?
Check
connection
between PCB
and MECHA
N
Is pulse of 2.5
+-2.5V developed
at pin13 of DU3?
Y
N
Check
peripheral
circuit of DU3
and MU9
Check BUS
line between
DU3 and DU5
N
Is pin5 of MJ4 =
"L" appeared?
N
Check
connection
between PCB
Y
Check line between DU3
and MJ4
and MECHA
N
Check voltage at
pin17 of RCN1 is
Y
Replace Pick Up Head
about 2.5V?
N
Check BUS line between RU1 and
DU3,DU3 and DU5
Page 12
9-12 Samsung Electronics
4. Disc Presence/Absense Judgment
4
Disc Presence Judgment
Turn On Laser
Does lens move
with UP/DOWN
full stroke in focus
direction?
Y
Does lens move
with UP/DOWN
full stroke in focus
direction?
Normal
Disc is presence
N
No signal
Check connection between RU1 and RCN1.
Check BUS line RU1 and DU3.
Check RU1
Is focus search
voltage developed
at pin 11 of DU3?
N
Check
Y
peripheral
circuit of MU9
Check BUS
line between
DU3 and DU5
Y
No Disc OK
N
Page 13
Samsung Electronics 9-13
5. Disc Motor Does Not Rotate
5
Disc Motor Does Not Rotate
Is Voltage of 0V
developed at
pin15 of DU3
N
Check peripheral circuit of DU3.
Check DU3
6. Focus Servo does not Work
6
Focus Servo does not Work
Are FE(pin42 of RU1)
and PI(pin36 of RU1)
normal?
Y
Check peripheral circuit of MU9
N
Check peripheral circuit of DU3 and
RU1
Y
Check peripheral circuit of DU3 and
RU1
Check peripheral circuit of MU9
Check Connection between PCB and
MECHA
Page 14
9-14 Samsung Electronics
7. Tracking Servo Does Not Work
7
Tracking Servo Does not Work
Check Voltage of
PI(pin36 of RU1) is
normal
Y
Is TE(pin41 of RU1)
normal?
Y
Check peripheral circuit or RCN1 and
MU9
Check connection between PCB
and MECHA
N
Disc Judgment Error
N
Check peripheral circuit or RU1
Change PickUp or RU1
Change DU3
Page 15
Samsung Electronics 9-15
8. CLV Servo Does Not Work
8
CLV Servo Does not Work
Y
Is XSRFIN(pin2 of DU3)
normal?
N
Is RF(pin4 of RCN1)
normal?
N
Check connection between PCB
and MECHA
Check peripheral circuit of DU3
Check peripheral circuit of MU9
Y
Check peripheral circuit of RU1
Page 16
9-16 Samsung Electronics
9-3 DVD Backend Parts
1. Initial operation after ON
POWER ON
N
1
LOGO ON
"NO DISC" DISPLAY
(in time of absence)
(in time of presence)
WAIT
N
YN
N
Y
Loading
Y
N
Check voltage 24pin connector
Pin 23,24:3.3v / pin 19,20:5v
Check 24pin connector
Pin 1,2,3,4,5:5v
Check 40pin connector
Pin 33,35,36
Fig,5,6,7
Check connector between
Loader PCB and Ziva5PCB
N
Play
OK
Fig.5 Fig.6 Fig.7
N
Check 10pin connector
Video out: pin 2 ->Fig.8
S-video out: pin 3,4 ->Fig9,10
N
Check
TR(D1Y)
Fig.8 Fig.9 Fig.10
Page 17
Samsung Electronics 9-17
2. Logo operation
1
Fig.1
Voltage 39VF800A IC
Pin 13,37:3.3V
Check 13.5MHZ crystal
Flg.1
Check 128MHZ
ZIVA5 PIN56
Flg.2
N
Check ZIVA5 PIN 51
Check ZIVA5
PIN150
Flg.4
Y
Flg.3
Y
Check data line between
39VF800A IC and ZIVA5
Fig.2 Fig.4Fig.3
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