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Sylvania 6720FDD, Service Manual, Page: 18 / 49

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Sylvania 6720FDD Service Manual Download Page 18

DVD Audio Block Diagram

TD900BLAD

IC601 (AUDIO DAC)

7

8

CN601

1
2
3

13

14

15

16

FROM
DVD SYSTEM
CONTROL
/SERVO
BLOCK

FROM
DIGITAL
SIGNAL
PROCESS
BLOCK

SERIAL

PORT

SERIAL

CONTROL

4X/8X

OVERSAMPLING

DIGITAL FILTER

/FUNCTION

CONTROLLER

ENHANCED

MULTI-LEVEL

DELTA-SIGMA

MODULATOR

DAC

LPF+AMP

L-CH

R-CH

LPF+AMP

DAC

SYSTEM CLOCK

PCM-BCK

SPDIF

PCM-DATA0
PCM-LRCLK

ADAC-MD
ADAC-MC
ADAC-ML

PCM-SCLK

DVD MAIN CBA UNIT

DATA(AUDIO) SIGNAL

 A-MUTE

12 SPDIF

7 DVD-A(L)
9 DVD-A(R)
6 DVD-A-MUTE

TO AUDIO BLOCK
<TV/VCR SECTION>
CN2401

DVD AUDIO SIGNAL

1-10-20

1-10-19

Summary of Contents for 6720FDD

Page 1: ...cing I Adjustment Procedures I Schematic Diagrams I CBA s Sec 2 Deck Mechanism Section I Standard Maintenance I Alignment for Mechanism I Disassembly Assembly of Mechanism Sec 3 Exploded views and Par...

Page 2: ...microproces sor with a jumper wire How to Set up the Service mode Service Mode 1 Use the service remote control unit 2 Turn the power on Use main power on the TV unit 3 To enter the TV mode press CH...

Page 3: ...again 3 C Trap Adjustment Purpose To get minimum leakage of the color signal carrier Symptom of Misadjustment If C Trap Adjustment is incorrect stripes will appear on the screen Note D1304 Cathode B...

Page 4: ...at the top and bottom of the monoscope pat tern are equal to each other 6 H Shift Adjustment Purpose To obtain correct horizontal position and size of screen image Symptom of Misadjustment Horizontal...

Page 5: ...izontal line becomes white 10 Choose CUT OFF DRIVE mode then press 4 but ton 11 Input the White Raster Signal from Video In 12 Adjust the RED DRIVE as needed with the CH o p buttons to get the followi...

Page 6: ...remote con trol unit if necessary The value will be changed in 0 5H steps up or down Adjustable range is up to 9 5H If the value is beyond adjustable range the display will change as Lower out of ran...

Page 7: ...at the center of the screen by rotating RB G C P Magnet See Fig 8 4 Fix the C P Magnets by tightening the Ring Lock 5 Remove the DY Wedges and slightly tilt the Deflec tion Yoke horizontally and vert...

Page 8: ...et Then plug it again 7 Turn the power on by pressing the power button and the tray will close 8 Press 1 2 3 4 and DISPLAY buttons on the remote control unit in that order Fig d appears on the screen...

Page 9: ...D900BLS SCL MEMORY SDA 6 5 P DOWN 84 P ON H P DOWN P ON H 31 LD SW 1 I 2 C OPEN 45 71 AL 5V SW1212 LD SW CS 7 FROM TO POWER SUPPLY BLOCK SDA SCL FROM TO CHROMA BLOCK IC1202 WF3 ENV DET 17 V H SW ENV D...

Page 10: ...1 WF1 TP1403 HA MONITOR BUFFER DV SYNC SP LP SLP ROTA DV SYNC ROTA 14 36 16 71 39 59 73 SPL PLAY REC EE PB RENTAL SPL PLAY REC EE PB RENTAL 42 EXT H 74 45 47 49 44 Q1402 WF6 WF5 WF4 WF2 L R VIDEO R 1...

Page 11: ...1 WF7 WF8 FROM TO SERVO SYSTEM CONTROL BLOCK 3 1 EQ AMP 100 SP LP ON 2 IC1802 OUTPUT SELECT IC2201 OP AMP JK1801 HEADPHONE JACK SPEAKER R CH CN1802 CN1805 SP1802 FROM TO Hi Fi AUDIO BLOCK FROM DVD AUD...

Page 12: ...7 1 39 26 24 27 N A OUT LIM 49 A OUT L A OUT R N A IN Hi Fi H SW A MUTE NORMAL H 40 ST SAP MODE FROM TO AUDIO BLOCK SCL P ON 9V TO SERVO SYSTEM CONTROL BLOCK Hi Fi AUDIO R HEAD Hi Fi AUDIO L HEAD CYLI...

Page 13: ...40 41 16 6 20 25 23 CHROMA TRAP SERIAL I F INTELLIGENT MONITORING CHROMA BPF SYNC SEPARATION LUMA SIGNAL PROCESS CIRCUIT CHROMA SIGNAL PROCESS CIRCUIT H SYNC PROCESS CIRCUIT V SYNC PROCESS CIRCUIT OS...

Page 14: ...US SCREEN JK501 HEATER 1 1 CN501A CL501 CL501A REC VIDEO SIGNAL PB VIDEO SIGNAL CN571 180V 3 3 11 S F HV FOCUS VR SCREEN VR B 7 CL502A 2 3 4 RED GREEN BLUE 8 B 5 DEF B H OUTPUT V RAMP FB 1 3 5 4 5 4 3...

Page 15: ...P ON 5V P ON 5V P ON 5V T 5V P ON 9V P ON 12V AL 5V P ON 12V Q1612 AL 33V D L 15V P ON 5V 5V CTRL P ON H FROM PIN31 OF IC1201 DVD MAIN POWER FROM PIN42 OF IC1201 CN2602 TO CN502 TO CRT H V BLOCK CN280...

Page 16: ...NDLE MOTOR DRIVE TRACKING ACTUATOR DRIVE EXT CLOCK CLK33M BE CLOCK 172 170 150 TRAY OUT TRAY IN FG IN 97 SLD 70 SPDL 71 TRACKING DRIVE 152 FOCUS DRIVE 60 66 TO DIGITAL SIGNAL PROCESS BLOCK FS FS TS TS...

Page 17: ...NST ROM SERIAL D A GENERAL I O INTERRUPT CONTROLLER TIMER WATCH DOG TIMER 32BIT CPU STREAM I F EXTERNAL MEMORY I F SDRAM ECC UMAC 124 125 122 123 128 129 126 127 131 130 135 133 132 134 78 DEBUG BCU I...

Page 18: ...TROL 4X 8X OVERSAMPLING DIGITAL FILTER FUNCTION CONTROLLER ENHANCED MULTI LEVEL DELTA SIGMA MODULATOR DAC LPF AMP L CH R CH LPF AMP DAC SYSTEM CLOCK PCM BCK SPDIF PCM DATA0 PCM LRCLK ADAC MD ADAC MC A...

Page 19: ...2 E3 E4 F1 F2 F3 F4 Main 1 5 Schematic Diagram TV VCR Section 1 11 3 1 11 4 TD900SCM1 MAIN 1 5 Ref No Position IC1201 C 3 IC1202 D 1 Q1205 A 1 Q1206 D 3 Q1207 A 2 Q1210 A 2 Q1211 A 1 Q1212 D 3 CL1201...

Page 20: ...GNAL PB AUDIO TV VCR LINE SIGNAL 1 11 5 1 11 6 TD900SCM2 Main 2 5 Schematic Diagram TV VCR Section MAIN 2 5 Ref No Position IC1401 H 2 Q1401 K 2 Q1402 K 3 Q1403 K 4 Q1871 G 2 Q1872 H 1 Q1873 G 2 Q1874...

Page 21: ...VIDEO SIGNAL PB VIDEO TV VCR LINE SIGNAL DVD VIDEO SIGNAL PB VIDEO TV VCR LINE DVD VIDEO SIGNAL 1 11 7 1 11 8 TD900SCM3 Main 3 5 Schematic Diagram TV VCR Section MAIN 3 5 Ref No Position IC1301 M 2 Q...

Page 22: ...V3 W1 W2 W3 S4 T4 U4 V4 W4 REC AUDIO SIGNAL PB AUDIO TV VCR LINE SIGNAL 1 11 9 1 11 10 TD900SCM4 Main 4 5 Schematic Diagram TV VCR Section MAIN 4 5 Ref No Position IC1751 T 2 Q1701 W 2 TP1701 T 2 TP17...

Page 23: ...VCR LINE SIGNAL DVD AUDIO SIGNAL 1 11 11 1 11 12 TD900SCM5 Main 5 5 Schematic Diagram TV VCR Section MAIN 5 5 Ref No Position IC1602 Y 2 IC1801 AA 2 IC1802 X 4 Q1608 Z 2 Q1611 Y 2 Q1612 BB 3 Q1613 Y...

Page 24: ...the power supply circuit to fail Power Supply AV 1 2 Schematic Diagram TV VCR Section 1 11 13 1 11 14 TD900SCP1 VOLTAGE CHART Power off mode Ref No 1 4 IC2601 13 2 2 3 IC2602 2 0 IC2603 1 8 1 9 IC2604...

Page 25: ...Power Supply AV 2 2 Schematic Diagram TV VCR Section 1 11 15 1 11 16 TD900SCP2 POWER SUPPLY AV 2 2 Ref No Position IC2201 I 2 Q2202 I 4 Q2204 H 4 Q2205 J 4 Q2207 H 3 Q2210 I 3 Q2211 I 3 Q2614 H 3 Q262...

Page 26: ...E3 1 11 17 1 11 18 TD900SCHV H V Schematic Diagram TV VCR Section H V Ref No Position IC551 B 3 Q571 C 1 Q591 B 1 Q592 B 1 CL501A E 1 CL502A E 1 CL503A A 2 CN571 C 3 J520 D 1 J521 D 2 J522 C 1 J535 D...

Page 27: ...DVD AUDIO SIGNAL PB VIDEO TV VCR LINE DVD VIDEO SIGNAL 1 11 19 1 11 20 TD900SCCRT CRT Schematic Diagram TV VCR Section TD900SCF Function Schematic Diagram TV VCR Section CRT Ref No Position Q501 A 2 Q...

Page 28: ...O AUDIO TRACKING SERVO SIGNAL SPINDLE SERVO SIGNAL SLED SERVO SIGNAL 1 11 21 1 11 22 TD900SCD1 DVD Main 1 3 Schematic Diagram DVD Section DVD MAIN 1 3 Ref No Position IC201 B 1 IC202 E 4 IC301 D 3 IC4...

Page 29: ...K4 L1 L2 L3 L4 DVD VIDEO SIGNAL DATA VIDEO AUDIO SPINDLE SERVO SIGNAL SLED SERVO SIGNAL FOCUS SERVO SIGNAL TRACKING SERVO SIGNAL DATA AUDIO SIGNAL 1 11 23 1 11 24 TD900SCD2 DVD Main 2 3 Schematic Diag...

Page 30: ...0 1 127 2 0 2 0 32 64 96 3 4 3 4 128 2 0 2 0 PIN NO PLAY STOP PIN NO PLAY STOP PIN NO PLAY STOP PIN NO PLAY STOP 129 2 0 2 0 161 193 225 1 9 1 9 130 2 2 2 2 162 1 4 1 4 194 0 0 226 3 3 3 3 131 2 3 2...

Page 31: ...Q3 Q4 R1 R2 R3 R4 DVD AUDIO SIGNAL DVD VIDEO SIGNAL DATA AUDIO SIGNAL 1 11 27 1 11 28 TD900SCD3 DVD Main 3 3 Schematic Diagram DVD Section DVD MAIN 3 3 Ref No Position IC102 O 4 IC103 O 3 IC104 N 3 I...

Page 32: ...1 V 10 ms 0 5 ms 1 V 20 s 20 s 200 V 10 V 5 ms 20 V 20 s 20 V 20 s WF15MAIN 1 5 SCHEMATIC DIAGRAM IC1201 PIN 58 1 V WF16MAIN 1 5 SCHEMATIC DIAGRAM IC1201 PIN 59 1 V 5 ms 20 s WF12CRT SCHEMATIC DIAGRA...

Page 33: ...A B SENSOR CBA ST SENSOR BHB300F01014 A B Hi Fi A L 1 Hi Fi COM 2 Hi Fi A R 3 V R 2 4 V COM 5 V L 2 6 V L 1 7 V COM 8 V R 1 9 AE H 1 AE H FE H 2 A COM 3 A PB REC 4 CTL 5 CTL 6 FE H 1 FE H GND 2 P SAF...

Page 34: ...D 2 E 3 DVD ON 5V 4 VREF 5 B 6 C 7 D 8 A 9 CD DVD 10 F 11 GND LD 12 CD LD 13 PD MONI 14 DVD LD 15 GND DVD PD 16 GND CD PD 17 TS 18 FS 19 FS 20 TS TO CN2402 TO CN2401 SPDIF 12 AUDIO 5V 11 NU 10 DVD AUD...

Page 35: ...xtures and Tools 2 2 1 Mechanical Alignment Procedures 2 3 1 Disassembly Assembly Procedures of Deck Mechanism 2 4 1 Alignment Procedures of Mechanism 2 4 9 Sec 2 Deck Mechanism Section I Standard Mai...

Page 36: ...only H Hours Check I Change Deck Periodic Service Schedule Ref No Part Name 1 000 H 2 000 H 3 000 H 4 000 H B2 Cylinder Assembly I I B3 Loading Motor Assembly I B8 Pulley Assembly I I B587 Tension Lev...

Page 37: ...that the Moving guide preparations are in the Eject Position 4 Turn the LDG Belt in the appropriate direction shown in Fig M1 until the Moving guide prepara tions come to the Eject Position Stop turni...

Page 38: ...the X value and envelope Not good Do the final tape traveling test to see that the tape runs normally in play mode with out creasing or slacking Completion Not good OK OK OK Not good Not good OK Flowc...

Page 39: ...the Audio Control Erase Head Symptom of Misalignment If the Horizontal Position of the Audio Control Erase Head is not properly aligned maximum envelope can not be obtained at the Neutral position of...

Page 40: ...wn in Fig M7 adjust the height of Guide Roller 2 Refer to Fig M3 so that the waveform looks like the one shown in Fig M9 4 If the envelope is as shown in Fig M8 adjust the height of Guide Roller 3 Ref...

Page 41: ...T DM1 DM6 Desolder 3 S 2 8 8 Loading Motor Assembly T DM1 DM7 Desolder LDG Belt 2 S 3 9 9 AC Head Assembly T DM1 DM7 S 4 10 2 Tape Guide Arm Assembly T DM1 DM8 P 2 11 10 C Door Opener T DM1 DM8 L 4 12...

Page 42: ...Installation Refer to Deck Exploded Views for lubrication 33 32 Loading Arm TU Assembly B DM2 DM14 Refer to Alignment Sec Pg 2 4 9 34 2 25 M Brake TU Assembly T DM1 DM15 P 7 Brake Belt 35 2 25 M Brak...

Page 43: ...2 4 3 TD951DA 14 13 11 10 12 7 46 8 30 40 16 39 38 42 41 43 9 34 15 36 35 Fig DM1 Top View 29 32 20 33 24 25 27 26 23 28 31 21 22 Fig DM2 Bottom View...

Page 44: ...ll up the right side on 2 to release Pin A and Pin B from the slots A Then remove Pin C and Pin D on 2 from the slots B as shown Fig DM4 2 Pin A Slots B Pin C Pin B Pin D Pull up Slide Slot A Slot A 1...

Page 45: ...tripe A 8 9 S 4 S 3 LDG Belt 28 11 13 12 A 10 L 4 Adj Screw P 3 P 2 When reassembling 10 and 12 confirm that pin of 10 and pin of 12 are in the groove of 28 as shown Pin of 12 Pin of 10 Groove of 28 V...

Page 46: ...as shown in the left figure and then install 23 while pressing the spring P 5 to the direction of the arrow in the left figure and confirming that the position of the spring P 5 is placed as shown in...

Page 47: ...44 First groove on 28 Align 25 and 28 as shown Bottom View 28 Pin of 34 Pin of 31 Position of Mode Lever when installed Pin of 35 Fig DM13 25 24 C 3 S 9 25 27 26 28 C 2 L 8 L 9 L 10 Refer to the Align...

Page 48: ...2 4 8 TD951DA Fig DM16 41 42 43 L 13 44 45 P 9 Slide Fig DM17...

Page 49: ...the mechanical or electrical parts Alignment points in Eject Position Alignment 1 Loading Arm SP and TU Assembly Install Loading Arm SP and TU Assembly so that their triangle marks point to each other...

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