Toshiba SD-V55HTSU, SD-V55HTSC Service Manual

CIRCUIT DIAGRAMS

DVD/VCR

Home Theater System

FILE NO. 810-200425

SD-V55HTSU SD-V55HTSC

DOCUMENT CREATED IN JAPAN, May, 2004

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

3-2

OVERALL WIRING DIAGRAM

PMC01

CFG

CAP Vcc

5.2VA

CAP REV’H’

V-limit

MOTOR GND

S.GND

DRUM(L/M)Vcc

CAP CTL

L/M CONTROL

DPG/FG

DRUM CTL

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

SP PB A

SP REC

SP PB B

EP PB B

EP REC

EP PB A

HiFi PB A

HiFi REC

HiFi PB B

1

2

3

4

5

6

7

8

9

1

2

3

4

5

6

7

8

9

PVS01 PSV01

GND

5.3VA

GND

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

32VA

32VA GND

NC

GND

NC

PWR SENSE

123456789

10

123456789

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

123456789

10111213141516171819202122

23

123456789

10111213141516171819202122

23

PV601 P6M01

KEY RETURN 1

KEY RETURN 2

5.3VA VIDEO IN

GND

AUDIO ’L’ IN

GND

AUDIO ’R’ IN

GND

FD(-)

-27VA

FD(+)

123456789

101112

123456789

101112

PV602 P6M02

REMOCON

GND

FLD CLOCK

FLD DATA

FLD ENA

VOLUME DOWN

VOLUME UP

1234567

PDM03

SPM -

SPM +

FM -

FM +

LM -

LM +

SW(OPEN)

SW(CLOSE)

GND

SW(LOADIN)

GND

123456789

10

11

123456789

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

FULL ERASE

P3D03

1

2

1

2

5.3VA

NC(-9V)

REG 8V(M)

GND(M)

REG 9V(+9V)

A. GND

REG 3.3V

5V

D. GND

REG 3.3V

A.GND

D.GND

PDV02PVD01

1

2

3

4

5

6

7

8

9

10

11

12

1

2

3

4

5

6

7

8

9

10

11

12

DVD V.IN

GND

DVD A.L IN

GND

DVD A.R IN

GND

VCR A.L OUT

VCR A.R OUT

GND

Pb/B

Y/G

Pr/R

PDV02PVD02

1

2

3

4

5

6

7

8

9

10

11

12

1

2

3

4

5

6

7

8

9

10

11

12

DVD ENA

GND

DVD DATA OUT

DVD DATA IN

DVD CLOCK

DVD RESET

AMP DATA IN

AMP CLOCK

GND

AMP ENA

AMP DATA OUT

AMP RESET

PDV02PVD02

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)

KEY RTN 1

GND(A)

F.A.R.IN

GND(A)

F.A.L.IN

GDN(D)

VIDEO IN

P6602P6603

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

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.outH/SW

R/C KEY

(W373, W374)

H/SW

Composite

VIDEO

6.5H(412µs)

VCR PART

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

Replace the BD101.

Replace the TH101.

Is the D105 normal?

Check or Replace the D105.

Replace the D129.

Replace the IC106.

YES

Is Vcc(8.5~21V) supplied 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

(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

Check the Power Control.

NO

Check or Replace the Q169, R175, R176, R177.

YES

Check or Replace the Q167/Q169.

YES

(3) No 5.0V (SYS/Hi-Fi/TUNER)

3-5

NO 5V.

5.3VA Line Check.

Is 5.3VA put into the Q168 Emitter?

Is about 5V put into the Q168 Base?

Is the Q169 Base “H”?

NO

Check the Power Control.

Check or Replace the Q169, R175, R176, R177.

YES

Check or Replace the Q168/Q169

(4) No 5V (TO DVD)

No 33V.

Check the Power Control.

Is Q163 Base “H”?

Check or Replace Q163, R168, R169.

NO

YES

(5) No 33V (TUNER)

NO 8V.

Check or Replace the D126.

Is Vcc(13V) supplied to (+) terminal in D126?

Check or Replace IC161, C163.

Is Vcc(12V) supplied to IC160 Pin1?

NO

Check or Replace the D163.

YES

(6) No 8V(TO DVD)

3-6

2. SYSTEM/KEY CIRCUIT

(1) AUTO STOP

(2) The unstable loading of a Cassette tape

Auto Stop

Does the SW30 waveform appear at the IC501 Pin18?

Do the T-UP Reel Pulses appear at the IC501 Pin80?

Is 12V applied to the

PMC01 Pin8?

Check the Drum Motor signal.

Does 5V appear at the RS501?

Check the Q160 Power Circuit.

Refer to “SMPS DRUM 12 Volt Trouble Shooting”.

Is 5V applied to the R531 ?

Refer to SMPS 5.3VA troubleshooting.

Check the IC501 Pins22, 23, 24, 25.

Do T/UP Reel Pulses appear at the point between R556 and R536?

Replace the T/UP Reel Sensor (RS501).

Check the CST SW and the peripheral circuitry.

Replace the IC501.

The unstable loading of a

Cassette tape

Does the “H” signal appear at the IC501 Pin58 during inserting the CST ?

Does the “L” signal appear at the IC501 Pin60 during inserting the CST?

Check the Deck Mechanism.

Caution :

Auto stop can occur because Grease or Oil has dried up

YES

NO

YES

NO

NO NO

YES

YES YES

3-7

3. SERVO CIRCUIT

(1) Unstable Video in PB MODE

Unstable Video in PB Mode.

Does the Noise level of the screen change periodically?

Do the CTL pulses appear at the IC501 Pin97?

Is adjusting the height of the CTL Head accurate?

Readjust the height of the CTL Head.

Replace the IC501.

Refer to “When the Y signal doesn’t appear on the screen in PB Mode”.

Does the CFG waveform appear at the IC501 Pin87?

On tracking do the CTL pulses move?

Does the Video Envelope waveform appear at the IC501 Pin9?

Replace the IC501.

YES

NO

(2) When the Drum Motor

(2) doesn’t run.

Do the DFG Pulses appear at the PMC01 Pin11?

Replace the Cap M.

Aren’t the foil patterns and

the Components between IC501 Pin 90 and PMC01 Pin11 short?

Replace the IC501.

Refer to “(2) No 12VA of Power section”

Do the Drum PWM Pulses appear at the IC501 Pin76?

Aren’t the foil patterns and the Components between IC501 Pin76 and PMC01 Pin12 short?

Do the DFG Pulses appear at the IC501 Pin90?

Do the Drum PWM Pulses appear at the IC501 Pin76?

Aren’t the connecting patterns and the Components between IC501 Pin76 and PMC01 Pin12 short?

When the Drum Motor doesn’t run,

Does 12V appear at the PMC01 Pin8?

Does 2.8V appear at the PMC01 Pin12?

Check the connector (PMC01) and the Drum Motor Ass’y.

NO

YES

NO

YES

3-8

Does the CFG signal appear at the PMC01 Pin1?

Does the PWM signal appear at the IC501 Pin77?

Is “DRUM CTL” 2.8V appear at the PMC01?

Check the PMC01 and the Capstan Motor Ass’y.

Does the Capstan PWM signal appear at the IC501 Pin77?

Aren’t the foil patterns and Components between IC501 Pin77 and PMC01 Pin9 short?

Does the CFG signal come into the IC501 Pin87?

Aren’t the foil patterns and Components between IC501 Pin77 and PMC01 Pin9 short?

2. SERVO CIRCUIT

(3) When the Capstan Motor doesn’t run,

NO

YES

When the Capstan Motor doesn’t run,

Does 12VA appear at the PMC01?

YES

Replace the IC501.

YES

NO

YES

Refer to “SMPS(CAPSTAN/12Volt) Trouble Shooting”.

Aren’t the foil patterns and component between IC501 Pin87 and PMC01 Pin1 short?

Check the Capstan Motor Ass’y.

NO

3-9

4. OSD CIRCUIT

(1) No OSD display.

(2) I2C BUS CHECK

KEY doesn’t working.

Is 5V applied to the IC501 Pin2, 3?

Does LED or FLD change when a function button is pressed?

No OSD or F.OSD display.

Is 5.3V applied to the IC501 Pin53?

Does oscillation occur at the IC501 Pins44, 45?

Replace the IC501.

The I2C waves don’t come out.

Does Power appear at the Pull up impedence (R569, R507)?

Replace the IC501.

Refer to “SMPS 5.3VA

Trouble Shooting”.

Replace the defective switches.

Refer to “SMPS 5.3VA Trouble Shooting”.

Check or Replace the pheripheral Circurity.(L511, R598, C596, C595)

Refer to “SMPS 5.3VA

Trouble Shooting”.

YES

NO

2. SERVO CIRCUIT

(4) KEY doesn’t working

3-10

5. Y/C CIRCUIT

(1) No Video in EE Mode,

No Video in EE Mode

Does the Video signal appear at the IC302 Pins1, 5?

Is there 5V at the IC302 Pin6?

Replace the IC302.

Does the Video signal appear at the IC301 Pins28, 30, 32?

Is REG 5.0V applied to the IC301Pins23, 44, 45, 52, 68, 77?

Does the Video signal appear at the IC301 Pin26?

Does the Video signal appear at the IC501 Pin52?

Does the Video signal appear at the IC602 Pin7?

Check the REG 5V Line. (Power Circuit)

Is I2C BUS signal applied to the IC301 Pins53, 54, 55?

Replace the IC301.

Check the path of the signal between the IC301 Pin 26 and IC501 Pins50, 52.

Is there 5V on the plus terminal of the C614?

Check the REG 5V Line. (Power Circuit)

Replace the IC602.

Check the System Circuit. (Refer to ‘SYSTEM I2C BUS CHECK Trouble Shooting’)

YES

NO

YES

Check DVD Video Input (IC602, Pin4), Tuner Video Input (TU701 Pin16), Line Video Input (JK601), respectively.

NO

3-11

3. Y/C CIRCUIT

(2) When the Y(Luminance) signal doesn’t appear on the screen in PB Mode,

Is 5V applied to the IC301 Pins23, 44, 45, 52, 68, 77?

Is the Y/C Bus siganl applied to the IC301 Pins53, 54, 55?

Does the normal RF signal appear at the IC301 Pin 14?

Check the line of the REG 5V Line. (Power Circuit)

Check the System Circuit. (IC501 Pin18)

Check the V.H.S/W level.

Refer to ‘SYSTEM Y/C BUS CHECK Trouble Shooting’.

Is the V.H.S/W signal applied to the IC301 Pin57?

Does the Rectangular waveform(5V) appear at the IC301 Pin57(V.H.S/W)

Clean the Drum.

Check the C324.

Check the R328, R347, C322, C323.

Does the Y(Luminance) signal appear at the IC301 Pin20?

Is the Y(Luminance) Video waveform showed up at the IC301 Pin22?

Replace the IC301.

NO

YES

NO

3-12

3. Y/C CIRCUIT

(3) When the C(Color) signal doesn’t appear on the screen in PB Mode,

Is 5V applied to the IC301 Pins23, 44, 45, 52, 68, 77?

Does the fsc signal appear at the IC301 Pins41, 50?

Check the line of the REG 5V Line. (Power Circuit)

Replace the X301.

Check the C342, C341, R333.

Is normal the X301 (3.58MHZ) of oscillation Frequency?

Replace the IC301.

Does the Color signal appear at the IC301 Pin48?

Replace the IC301.

NO

YES

NO

3-13

3. Y/C CIRCUIT

(4) When the Video signal doesn’t appear on the screen in REC Mode,

YES

NO

YES

Check system part (V.H/SW)

Replace the IC301.

Check the drum

*OPTION Pins72, 73, 74(SP) Pins65, 66, 67(EP)

REC mode

Check the EE mode

NO

Is EE mode normal?

Is color

normal?

A

YES YES

Is brightness normal?

Does signal appear at IC301 Pins41, 50?

NO

Check X301 oscillation frequency.

YES

Is the brightness signal supplied to IC301 Pins18?

Is 5V supplied to IC301 Pins23, 44, 45, 68, 77?

Check the power of Pins23, 44, 45, 52, 68, 77.

Check the 5V power

NO

Is Y/C Bus applied to IC301 Pins53, 54, 55?

Check the REG 5V power

Check system part

Do X301 and X-TAL oscillate?

Check X301.

Is V.H SW supplied to IC301 Pin57?

Does the FM signal appear at IC301 Pins73(SP)/ 66(EP)?

3-14

6. Tuner/IF CIRCUIT

(1) No Picture on the TV screen

No picture on the TV screen

Does the Video signal at the TU701 Pin16.

YES

YES YES

Is +33V applied to TU701 Pin14?

YES

Is +5V applied to TU701 Pin3?

NO

Does the video signal appear at IC302 Pin7.

NO

Does the Video signal at the IC501 Pin 52.

YES

NO

Does the Video signal at the IC602 Pin 7.

YES

NO

Check the signal flow from IC602 Pin7 to JK601 Pin Video out.

YES

Check 33V line.

NO

Check 5V line.

NO

YES

Does the Clock signal appear at TU701 Pin9?

Check the lIC Clock Signal of µ-COM Pin71.

NO

YES

Does the data signal appear at TU701 Pin10?

Replace Tuner.

Check the signal flow from IC501 Pin27.(Pin27 is ‘L’ state in Tuner Mode)

Check the signal from IC301 Pin26 to IC501 Pin50.

Check the signal from IC501 Pin52 to IC602 Pin1 and IC602 Pin2. (IC602 Pin2 is ‘L’ state in VHS mode)

Check the lIC Data Signal of µ-COM Pin72.

NO

3-15

(2) No Sound

No Sound.

Check the Vcc of TU701 Pins3, 14.

YES

Check 5.2V, 33V Line.

NO

Check the Tuner SiF signal at IC801 Pin57.

YES

Check the Audio of IC801 Pins78, 80.

YES

Check the Signal flow from IC801 Pins78, 80 to JK601 Audio out(L), (R)

YES

Check the Tuner SIF of TU701 Pin13.

NO

1. Check the Vcc(5.3VA, 9V) of IC801 Pins3, 5, 36, 54.

2. Check the IIC Clock and Data at IC801 Pins37, 38.

NO

3-16

Check power.

Check REC start “H” signal of µ-COM.

Check IC501 Pin 19.

(Audio Swich 30)

Check the Vcc of IC801. (Pins 3, 15, 32, 46)

Is Pin 30 of IC801 over

3.5V ?

Is the Head switching signal IC801 Pin 39 O.K?

Check the connection at P3D01 if good then Replace IC801.

Check Ports of µ-COM.

Check A.MUTE port of µ-COM (Pin High of IC501).

Replace IC801.

Hi-Fi Playback.

No sound

Check the Hi-Fi Selection Switch and the Tape quality.

Is the RF waveform at IC801 Pin 23 over 3V Vp-p?

Check the Contact point of Audio Output.

Do Audio signals appear at IC801 Pin 80(L-CH), 78 (R-CH)?

Is IC801 Pin 49(A.Mute) “High”?

Check IC801 Pin 37(Data), Pin 38(Clock).

A.

YES

NO

YES

NO

7. Hi-Fi Circuit

YES

NO

YES

3-17

Hi-Fi REC.

It is impossible to record and playback Hi-Fi Audio signal.

Check Vcc of IC801. (Pins 3, 15, 32, 46)

Check Power.

Check ports of µ-COM.

Check the Port of µ-COM.

Check Audio Input signal Line (9, 11, 12, 71, 73, 74), Tuner(57).

Replace IC801.

Check the Port of u-COM.

B.

Check IC801 Pin 37(Data),Pin 38(CLOCK).

Is IC501 Pin 84(A.Mute) “High”?

YES

Are Audio signals present at IC801

Pins 78, 80?

Do FM Audio signals appear at IC801 Pin 26?

YES

Is IC801 Pin 17(REC “H”) “High”?

Check the Contact Points of Drum

Connector if good then Replace the Drum.

YES

NO

3-18 3-19

BLOCK DIAGRAMS

1. POWER(SMPS) BLOCK DIAGRAM 1

BD101

LINE FILTER

BLOCK

( C101, C102,

L101, L102 )

!

V101

!

F101

BD101

C103

DRIVE & S/W BLOCK

QUASI-RESONANT BLOCK

( IC101, R114, R115, C123, C107,

BC101, D108, R101, D102, R102,

D103, R106, ZD102, Z101, C108,

R104, C109, C110)

DRIVE & S/W BLOCK SOFT-START BLOCK

( R107, R108, C121, R105,

C120, C119, ZD1103, D105,

R111, BC102 )

SNUBBER

BLOCK

( R110, C115,

D104, C117 )

!

IC102

!

T101

IC103

T102

RECTIFER & SMOOTHING

BLOCK

( D122, C131, R131,

C132, C133, C135, L122 )

FEED-BACK

BLOCK

( R122, R121, C136,

R123, R124, R125,

R126 )

RECTIFIER &

F102

SMOOTHING

BLOCK

(D123, C130, ZD121, R127)

RECTIFIER & SMOOTHING

BLOCK

( D125, R129, C138 )

RECTIFIER & SMOOTHING

BLOCK

( D127, C142, L123, C146 )

RECTIFIER & SMOOTHING

BLOCK

( D124, C137, R128 )

RECTIFIER & SMOOTHING

BLOCK

( D126, C140, L122, C141 )

PSW01

32VA

NC

PWR SENSE

BLOCK

( R184, R185 )

PSV01

FD(+)

FD(-)

-29VA

33VA

13VA

3.8VA

5.3VA

PW101

!

BR

BL

(BK)

(WH)

NOTES) Symbol denotes AC ground.

NOTES) Symbol denotes DC chassis ground.

C113C114

!!

C122

RECTIFIER & SMOOTHING

BLOCK

( D129, C144, L124, C147 )

FEED-BACK

BLOCK

!

IC105

IC106

( R132, R133, C148,

R134, R135, R136,

R137 )

TOSHIBA

SD-V55HTSU/SC

3-20 3-21

2. POWER(SMPS) BLOCK DIAGRAM 2

33VT BLOCK

(Q163, R168,

R169, R170)

TO SYS

FD(+)

TO SYS

FD(-)

TO SYS

-29VA

3.3V BLOCK

(IC161, C164)

TO TU

33V

FD(+)

FD(-)

-29VA

GND

33VA

GND

13VA

GND

3.8VA

GND

5.3VA

GND

PVS01

15

14

13

12

11

10

1

2

3

4

5

6

7

8

9

10

11

12

TO SYS

PVD01

5.3VA

5.0V

8V

GND (M)

9V

GND (A)

3.3V

5V

GND

3.5V

A.GND

D.GND

5.3VA

8V BLOCK

(IC160, D163,

C163, R161)

9V BLOCK

(Q162, R171, ZD163)

9

8

7

6

5

4

3

2

3.3V BLOCK

(IC163, C177)

3.5V BLOCK

(IC162, D165, C172)

5V BLOCK

(Q168, R178, R179,

R180, C169)

5.2V BLOCK

(Q167, C168, R175,

R176, R177)

1

TO TU/SYS/ Hi-Fi

5.2V

FROM µ-COM

PWR CTL 'H'

TO AVCP

REG 5V

(Q166, C166, C167,

R174, ZD161)

PWR CTL BLOCK

(Q169, C170, R181,

R182, R183)

TOSHIBA

SD-V55HTSU/SC

3-22 3-23

3. Y/C BLOCK DIAGRAM

EP PB 'A'

EP PB 'B'

SP PB 'B'

SP PB 'A'

64

59 58 57 55 54 53

65

67

72

74

ACC DET

ENV

DET

C-ROT RF-SW IN

Y/C ENA

Y/C DATA

Y/C CLOCK

V.OUT

AUDIO

MUTE

HA SW

P

C-LPF

MAIN

CONV

3.58M BPF2

ACC AMP

ACC DET

CLAMP

Y

LPF

CLAMP

IN

OUT

VCA

CCD

3.58M BPF1

Y/C MIX

6dB

DOUBLE

LIMFMDEM

SUB

LPF

MAIN

DE-EM

PB

FM-EQ

FM

AGC

CNC

YNR

COMB

4.21M BPF

SUB

CONV

39

37

36

34

26

22

21

P

B

(PB Mode)

(REC Mode)

V. H/SW55Y/C ENA

57

Y/C DATA

Y/C CLOCK

54

53 51 50 49 48 47

SERIAL

DECODER

X-TAL

3.58MHZ

320FH

VCO

SLDVX01

OUT

39

38

REC

APC

AFC

R

SP REC

EP REC

66

BGA

MAIN CONV

4.21M BPF

SUB

CONV

B-UP AMP

ACC AMP

ACC DET

DETAIL

ENH

NL

EMPHA

CLAMP

MAIN

EMPHA

FM

MOD

REC

FM-EQ

LPF

3.58M BPF1

YNR

COMB

Y

69

C-LPF

70

R

73

CCD

VIDEO

4.7K

AGC

CLAMP

VCA

CLAMP

20

37

IN

36

34

TU/LINE1

32

DVD

30

LINE2

28

V.OUT

26

IC302

SW

BLOCK

22

21

B

TOSHIBA

SD-V55HTSU/SC

3-24 3-25

4. NORMAL AUDIO BLOCK DIAGRAM

IC301

LA71206M

SIF

A_IN

RF_MOD

IC801

LA72670M

TUNER

TU701

10

76

DET

NORMAL

AUDIO

OUT

LINE AUDIO(R) IN

LINE AUDIO(L) IN

REAR JACK

REAR Jack

A. OUT (L)

ALC

SIF

DE MOD

INPUT

SELECT

OUTPUT

SELECT

4

6

13

1

57

9

2

71

117312

74

80

78

A. OUT (R)

DVD AUDIO

(System)

IC801

LA72670M

IC301

LA71206M

AMP

EQ

AMP

78

410

A. OUT (R)

MOD. OUT

DATA

CLOCK

R/P HEAD

N.A.IN

53

ENA

55 54

5

4

6

From u-COM

80

A. OUT (L)

2

OUTPUT

SELECTOR

EQ

3

2

1) EE Mode 2) PB Mode 3) REC Mode

9

IC301

LA71206M

IC801

LA72670M

TU701

TUNER

DET

ALC

76

NORMAL

AUDIO

OUT

6

SIF

DE MOD

13 57

SIF

REC

AMP

10

4

RF MOD.

INPUT

SELECT

1 2

A_IN

OUTPUT

SELECT

9

71

LINE AUDIO(L) IN

LINE AUDIO(R) IN

REAR Jack

78

A. OUT (R)

80

A. OUT (L)

TOSHIBA

SD-V55HTSU/SC