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CIRCUIT DIAGRAMS
DVD/VCR
Home Theater System
FILE NO. 810-200425
MAY, 2004 L
SD-V55HTSU
SD-V55HTSC


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3-1
SECTION 3
ELECTRICAL
CONTENTS
OVERALL WIRING DIAGRAM .............................3-2
VCR PART
ELECTRICAL ADJUSTMENT
PROCEDURES ...........................................................3-3
ELECTRICAL TROUBLESHOOTING
GUIDE ............................................................................3-4
1. POWER(SMPS) CIRCUIT.......................................3-4
2. SYSTEM/KEY CIRCUIT..........................................3-6
3. SERVO CIRCUIT ....................................................3-7
4. OSD CIRCUIT .........................................................3-9
5. Y/C CIRCUIT.........................................................3-10
6. TUNER/IF CIRCUIT ..............................................3-14
7. Hi-Fi CIRCUIT.......................................................3-16
BLOCK DIAGRAMS ...............................................3-18
1. POWER(SMPS) BLOCK DIAGRAM 1 .................3-18
2. POWER(SMPS) BLOCK DIAGRAM 2 .................3-20
3. Y/C BLOCK DIAGRAM ........................................3-22
4. NORMAL AUDIO BLOCK DIAGRAM ..................3-24
5. Hi-Fi BLOCK DIAGRAM ......................................3-26
6. SYSTEM BLOCK DIAGRAM ...............................3-28
CIRCUIT DIAGRAMS .............................................3-30
1. POWER(SMPS) CIRCUIT DIAGRAM 1 ...............3-30
2. POWER(SMPS) CIRCUIT DIAGRAM 2 ...............3-32
3. JACK/TUNER CIRCUIT DIAGRAM .....................3-34
4. A/V CIRCUIT DIAGRAM.......................................3-36
5. Hi-Fi CIRCUIT DIAGRAM ....................................3-38
6. SYSTEM CIRCUIT DIAGRAM..............................3-40
7. KEY CIRCUIT DIAGRAM .....................................3-42
· WAVEFORMS.........................................................3-44
· CIRCUIT VOLTAGE CHART ..................................3-46
PRINTED CIRCUIT DIAGRAMS ........................3-48
1. MAIN P.C.BOARD ................................................3-48
2. POWER P.C.BOARD ............................................3-50
3. KEY 1(LEFT) P.C.BOARD....................................3-52
4. KEY 2(RIGHT) P.C.BOARD..................................3-52
DVD & AMP PART
ELECTRICAL TROUBLESHOOTING
GUIDE ..........................................................................3-54
1. SYSTEM OPERATION FLOW..............................3-54
2. TEST & DEBUG FLOW........................................3-55
3. AUDIO µ-COM CIRCUIT(DVD & AMP)................3-63
DETAILS AND WAVEFORMS ON
SYSTEM TEST AND DEBUGGING ..................3-62
1. SYSTEM 27MHZ CLOCK,
RESET, FLASH R/W SIGNAL ..............................3-62
2. SDRAM CLOCK ...................................................3-64
3. TRAY OPEN/CLOSE SIGNAL..............................3-64
4. SLED CONTROL RELATED SIGNAL
(NO DISC CONDITION)........................................3-66
5. LENS CONTROL RELATED SIGNAL
(NO DISC CONDITION)........................................3-66
6. LASER POWER CONTROL RELATED
SIGNAL(NO DISC CONDITION) ..........................3-67
7. DISC TYPE JUDGEMENT WAVEFORMS ...........3-67
8. FOCUS ON WAVEFORMS ...................................3-69
9. SPINDLE CONTROL WAVEFORMS
(NO DISC CONDITION)........................................3-70
10. TRACKING CONTROL RELATED
SIGNAL(SYSTEM CHECKING) .........................3-71
11. RF WAVEFORM..................................................3-72
12. MT1379 VIDEO OUTPUT WAVEFORMS...........3-72
13. AUDIO OUTPUT FROM AUDIO DAC ................3-74
14. DVD & AMP WAVEFORMS................................3-75
BLOCK DIAGRAMS ...............................................3-76
1. OVERALL BLOCK DIAGRAM .............................3-76
2. SERVO BLOCK DIAGRAM..................................3-77
3. MPEG & MEMORY BLOCK DIAGRAM...............3-78
4. VIDEO & AUDIO BLOCK DIAGRAM...................3-79
5. DVD & AMP BLOCK DIAGRAM ..........................3-80
CIRCUIT DIAGRAMS .............................................3-81
1. MPEG CIRCUIT DIAGRAM..................................3-81
2. RF & SERVO CIRCUIT DIAGRAM ......................3-83
3. AUDIO, µ-COM
CIRCUIT DIAGRAM(DVD & AMP) .......................3-85
4. DIGITAL AMP CIRCUIT
DIAGRAM (DVD & AMP)......................................3-87
5. PWM & CODEIC
CIRCUIT DIAGRAM (DVD & AMP)......................3-89
6. INTERFACE
CIRCUIT DIAGRAM (DVD & AMP)......................3-91
· CIRCUIT VOLTAGE CHART ..................................3-93
PRINTED CIRCUIT DIAGRAMS ........................3-97
1. DVD & AMP P.C.BOARD .....................................3-97


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3-2
OVERALL WIRING DIAGRAM
PMC01
CFG
CAPVcc
5.2VA
CAPREV'H'
V-limit
MOTOR
GND
S.GND
DRUM(L/M)Vcc
CAPCTL
L/MCONTROL
DPG/FG
DRUMCTL
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
P3D01
SPPB
A
SPREC
SPPB
B
EPPB
B
EPREC
EPPB
A
HiFiPB
A
HiFiREC
HiFiPB
B
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
PVS01
PSV01
GND
GND
5.3VA
5.3VA
GND
3.8VA
3.8VA
GND
13VA
GND
33VA
GND
-29VA
FD(-)
FD(+)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
PSW01
32V
A
32V
A
32V
A
32V
A
GND
32V
A
GND
32V
A
GND
NC
GND
NC
PWR
SENSE
1
2
3
4
5
6
7
8
9
10
1
2
3
4
5
6
7
8
9
10
PDM01
H
FM_VCC
RF_VCC
LD_DVD
MD_DVD
VR_DVD
GND_PD
VRBF
VC
F
B
A
D
C
B
FOCUS+
TRACKING-
TRACKING+
FOCUS-
SW_PDIC
GND_LCD
LD_CD
MD_CD
VR_CD
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
PV601
P6M01
KEY
RETURN
1
KEY
RETURN
2
5.3V
A
VIDEO
IN
GND
AUDIO
'L'
IN
GND
AUDIO
'R'
IN
GND
FD(-)
-27V
A
FD(+)
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
PV602
P6M02
REMOCON
GND
FLD
CLOCK
FLD
DA
T
A
FLD
ENA
VOLUME
DOWN
VOLUME
UP
1
2
3
4
5
6
7
1
2
3
4
5
6
7
PDM03
SPM
-
SPM
+
FM
-
FM
+
LM
-
LM
+
SW(OPEN)
SW(CLOSE)
GND
SW(LOADIN)
GND
1
2
3
4
5
6
7
8
9
10
11
1
2
3
4
5
6
7
8
9
10
11
P3D02
CTL(+)
CTL(-)
A/E(+)
A/E(-)
A.REC
A.PB
1
2
3
4
5
6
1
2
3
4
5
6
GND
FULLERASE
P3D03
1
2
1
2
5.3VA
NC(-9V)
REG8V(M)
GND(M)
REG9V(+9V)
A.GND
REG3.3V
5V
D.GND
REG3.3V
A.GND
D.GND
PDV02
PVD01
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
DVDV
.IN
GND
DVDA.L
IN
GND
DVDA.R
IN
GND
VCRA.L
OUT
VCRA.R
OUT
GND
Pb/B
Y/G
Pr/R
PDV02
PVD02
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
DVDENA
GND
DVDDA
TA
OUT
DVDDA
TA
IN
DVDCLOCK
DVDRESET
AMPDA
TA
IN
AMPCLOCK
GND
AMPENA
AMPDA
TA
OUT
AMPRESET
PDV02
PVD02
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
GND(D)
KEYR
TN1
GND(A)
F .A.R.IN
GND(A)
F .A.L.IN
GDN(D)
VIDEOIN
P6602
P6603
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
DECK
MD
MPEG/AMP
BOARD
SMPS
BOARD
TIMER
BOARD
KEY
BOARD
VCR


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3-3
ELECTRICAL ADJUSTMENT PROCEDURES
1. Servo Adjustment
1) PG Adjustment
· Adjustment And Specification
· Test Equipment
a) OSCILLOSCOPE
b) NTSC MODEL : NTSC SP TEST TAPE
MODE
PLAY
· Adjustment Procedure
a) Insert the SP Test Tape and play.
b) Press the "O" key on the Remote controller and the "PLAY" key on the Front Panel the same time, the
unit then goes in to Tracking initial mode.
c) Trigger the mixed Combo Video Signal of CH2 to the CH1 H/SW(W373, W374), and then check the dis-
tance (time difference), which is from the selected A(B) Head point of the H/SW(W373, W374) signal to
the starting point of the vertical synchronized signal, to 6.5H ± 0.5H (412µs, 1H=63µs).
Note - Press FRONT CH UP KEY and FRONT PLAY KEY on Deck playback, and it goes in to ATR PRE-
SET. after the SP Test Tape is inserted.
· PG Adjustment Method
a-1) Playback the SP standard tape
b-2) Press the "O" key on the Remote controller and the "PLAY" key on the Front Panel the same time,
Tracking initial mode.
c-3) Repeat the above step(No.b-2), the unit will then finish the PG adjusting automatically.
d-4) Stop the playback, the unit then exits PG adjusting mode after saving the PG data.
· CONNECTION
· WAVEFORM
V.Out
H/SW(W373, W374)
R/C TRK JIG KEY
6.5 ± 0.5H
MEASUREMENT POINT
ADJUSTMENT POINT
SPECIFICATION
V.Out
H/SW(W373, W374)
OSCILLOSCOPE
CH1 CH2
V.out
H/SW
R/C KEY
(W373, W374)
H/SW
Composite
VIDEO
6.5H(412µs)
VCR PART


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3-4
ELECTRICAL TROUBLESHOOTING GUIDE
1. Power(SMPS) CIRCUIT
NO 5.3VA.
Replace the F101.
(Use the same Fuse)
Is the F101 normal?
Is the TH101
normal?
Is the BD101
normal?
NO
NO
NO
NO
NO
NO
Replace the
BD101.
Replace the TH101.
Is the D105
normal?
Check or Replace
the D105.
Replace the D129.
Replace the IC106.
YES
YES
YES
YES
YES
YES
YES
Is Vcc(8.5~21V) sup-
plied to IC104 Pin3?
NO
Is the D129
normal?
Is there about 2.5V
at the IC106 Vref?
Check the Main PCB
5.3VA/5.0V Line short?
(1) No 5.3VA (SYS/Hi-Fi/TUNER)
NO 12VA.
Check or Replace
the D126.
Is the Vcc(13V) supplied
to (+) terminal in D126?
Check or Replace
the Motor Vcc.
NO
YES
YES
(2) No 12VA (TO CAP, DRUM MOTOR)
NO 5.0VA.
5.3VA Line Check.
Is 5.3VA put into
the Q167 Emitter?
Is about 5V put into
the Q167 Base?
Is the Q169 Base
"H"?
NO
NO
Check the Power
Control.
NO
Check or Replace the
Q169, R175, R176, R177.
YES
YES
YES
Check or Replace
the Q167/Q169.
YES
(3) No 5.0V (SYS/Hi-Fi/TUNER)