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Sylvania 6720FDD Service Manual

20" color tv/dvd/vcr
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SERVICE MANUAL
Sec. 1: Main Section
I Specifications
I Preparation for Servicing
I Adjustment Procedures
I Schematic Diagrams
I CBA's
20" COLOR TV/DVD/VCR
Sec. 2: Deck Mechanism Section
I Standard Maintenance
I Alignment for Mechanism
I Disassembly/Assembly of Mechanism
6720FDD
Sec. 3: Exploded views
and Parts List Section
I Exploded views
I Parts List

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Summary of Contents for Sylvania 6720FDD

  • Page 1 Sec. 3: Exploded views I Specifications I Standard Maintenance and Parts List Section I Alignment for Mechanism I Preparation for Servicing I Exploded views I Disassembly/Assembly of Mechanism I Parts List I Adjustment Procedures I Schematic Diagrams I CBA’s 20" COLOR TV/DVD/VCR 6720FDD...
  • Page 2 ELECTRICAL ADJUSTMENT INSTRUCTIONS General Note: How to Set up the Service mode: "CBA" is abbreviation for "Circuit Board Service Mode: Assembly." 1. Use the service remote control unit. 2. Turn the power on. (Use main power on the TV NOTE: unit.) Electrical adjustments are required after replacing 3.
  • Page 3 2. H Adjustment 3. C-Trap Adjustment Purpose: To get correct horizontal position and size of Purpose: To get minimum leakage of the color signal screen image. carrier. Symptom of Misadjustment: Horizontal position and Symptom of Misadjustment: If C-Trap Adjustment is size of screen image may not be properly displayed.
  • Page 4 4. V. Size Adjustment 6. H. Shift Adjustment Purpose: To obtain correct vertical height of screen Purpose: To obtain correct horizontal position and image. size of screen image. Symptom of Misadjustment: If V. Size is incorrect, Symptom of Misadjustment: Horizontal position and vertical height of image on the screen may not be size of screen image may not be properly displayed.
  • Page 5 8. Sub-Brightness Adjustment Notes: Screen Control FBT --- H.V. CBA FBT= Fly Back Transformer Purpose: To get proper brightness. Use the Remote Control Unit Symptom of Misadjustment: If Sub-Brightness is 1. Degauss the CRT and allow CRT to operate for 20 incorrect, proper brightness cannot be obtained by minutes before starting the alignment.
  • Page 6 9. Focus Adjustment 4. Press "CH o" or "CH p" button on the remote con- trol unit if necessary. The value will be changed in Purpose: Set the optimum Focus. 0.5H steps up or down. Adjustable range is up to 9.5H.
  • Page 7 14. Convergence Adjustment 5. Remove the DY Wedges and slightly tilt the Deflec- tion Yoke horizontally and vertically to obtain the Purpose: To obtain proper convergence of red, green best overall convergence. and blue beams. 6. Fix the Deflection Yoke by carefully inserting the Symptom of Misadjustment: If Convergence Adjust- DY Wedges between CRT and Deflection Yoke.
  • Page 8 FIRMWARE RENEWAL MODE 1. Turn the power on and remove the disc on the tray. 5. After programming is finished, the tray opens auto- 2. To put the DVD player into version up mode, press matically. Fig. c appears on the screen. [9], [8], [7], [6], and [SEARCH MODE] buttons on the remote control unit in that order.
  • Page 9 BLOCK DIAGRAMS <TV/VCR Section> Servo/System Control Block Diagram IC1201 FUNCTION CBA (SERVO/SYSTEM CONTROL) SW1201 SW1203, AL+5V MAIN CBA SW1206 SW1210 SW2401 SW2408 CN2805 CN1805 KEY SWITCH KEY0 KEY SWITCH KEY1 KEY1 RS1201 CN2402 CN2803 CN1804 FROM/TO Q2621 REMOTE 20 SDATA SDATA SDATA REMOTE...
  • Page 10 Video Block Diagram REC VIDEO SIGNAL PB VIDEO SIGNAL MODE: SP/REC MAIN CBA TP1402 X1401 Q1401 3.58MHz V-OUT V-OUT BUFFER CHROMA VIDEO BLOCK EXT-V-IN IC1401 VIDEO/AUDIO SIGNAL PROCESS 62 61 TU1001 Q1402 (TUNER UNIT) CCD 1H BUFFER DELAY VIDEO CHARA LUMINANCE DOC YNR Y/C COMB SIGNAL PROCESS...
  • Page 11 Audio Block Diagram DVD AUDIO SIGNAL DATA(AUDIO) SIGNAL REC-AUDIO SIGNAL PB-AUDIO SIGNAL CN1805 CN2805 CN2801 CL2801 DVD-A-MUTE SP2801 SP-L SP-L DVD-H FROM/TO SERVO/SYSTEM SPEAKER IC2201 SP-GND CONTROL BLOCK JACK-MUTE L-CH (OP AMP) WF19 CN2401 CN2803 CN1804 4 DVD-A(R) DVD-A(R) FROM DVD FUNCTION CBA AUDIO BLOCK 6 DVD-A(L)
  • Page 12 Hi-Fi Audio Block Diagram PB-AUDIO SIGNAL REC-AUDIO SIGNAL MAIN CBA IC1751(MTS/ SAP/ Hi-Fi AUDIO PROCESS/ Hi-Fi HEAD AMP) CONT TU1001 (TUNER UNIT) SERIAL FROM/TO Q1010 DATA SERVO/ SYSTEM BUFFER DECODER ST/SAP CONTROL BLOCK DEMOD FILTER DEMOD MATRIX DEMOD STEREO PILOT FILTER CANCEL RIPPLE...
  • Page 13 Chroma Block Diagram REC VIDEO SIGNAL PB VIDEO SIGNAL DVD VIDEO SIGNAL MAIN CBA TU1001 (TUNER UNIT) IC1301 (CHROMA/DEFLECTION SIGNAL PROCESS) TO POWER +5.7V +5V CTRL SUPPLY BLOCK REG. SERIAL TUNER TV-VIDEO INTELLIGENT FROM V-OUT MONITORING VIDEO BLOCK IC1802 EXT-V-IN LINE (OUTPUT SELECT) TUNER...
  • Page 14 CRT/H.V. Block Diagram DVD VIDEO SIGNAL REC VIDEO SIGNAL PB VIDEO SIGNAL IC551 (V-DEFLECTION CONTROL) L551 WF11 D.Y. THERMAL PROTECTION DRIVE Q591 H.DRIVE PULSE DRIVE WF10 Q571 CN571 T572 H.OUTPUT J521 FROM CN502 CL502B CL502A POWER 5 +B SUPPLY 6 +B BLOCK FOCUS VR 3 DEF+B...
  • Page 15 Power Supply Block Diagram CAUTION ! NOTE : Fixed voltage power supply circuit is used in this unit. CAUTION: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, The voltage for parts in hot circuit is measured using If Main Fuse (F2601) is blown, check to see that all components in the power supply REPLACE ONLY WITH SAME TYPE 4 A, 125V FUSE.
  • Page 16 BLOCK DIAGRAMS < DVD Section > DVD System Control/Servo Block Diagram FOCUS SERVO SIGNAL TRACKING SERVO SIGNAL SLED SERVO SIGNAL SPINDLE SERVO SIGNAL IC101 (MICRO CONTROLLER) EXT CLOCK CLK33M BE CLOCK IC451 (CLOCK GENERATOR) X451 MULTI X'TAL 36.864MHz PLL2 FSEL PCM-SCLK A-MUTE A-MUTE...
  • Page 17 Digital Signal Process Block Diagram DATA(AUDIO) SIGNAL DATA(VIDEO/AUDIO) SIGNAL DVD VIDEO SIGNAL FOCUS SERVO SIGNAL TRACKING SERVO SIGNAL IC102 (SDRAM) IC101 (MICRO CONTROLLER) SDRAM ADDRESS(0-10) SDRAM ADDRESS(0-10) DATA SDRAM EXTERNAL MEMORY DECODER INST. DECODER STREAM SDRAM DATA(0-31) SDRAM DATA(0-31) DATA PIXEL OPERATION INST.
  • Page 18 DVD Audio Block Diagram DATA(AUDIO) SIGNAL DVD AUDIO SIGNAL IC601 (AUDIO DAC) SPDIF FROM L-CH 4X/8X DIGITAL LPF+AMP PCM-BCK OVERSAMPLING ENHANCED SIGNAL SERIAL PCM-DATA0 DIGITAL FILTER MULTI-LEVEL PROCESS PORT PCM-LRCLK /FUNCTION DELTA-SIGMA BLOCK R-CH MODULATOR LPF+AMP CONTROLLER CN601 12 SPDIF TO AUDIO BLOCK 7 DVD-A(L) <TV/VCR SECTION>...
  • Page 19 Main 1/5 Schematic Diagram < TV/VCR Section > MAIN 1/5 Ref No. Position IC1201 IC1202 TRANSISTORS Q1205 Q1206 Q1207 Q1210 Q1211 Q1212 CONNECTOR CL1201 TEST POINT TP1201 1-11-3 1-11-4 TD900SCM1...
  • Page 20 Main 2/5 Schematic Diagram < TV/VCR Section > REC VIDEO SIGNAL PB VIDEO(TV/VCR/LINE) SIGNAL REC AUDIO SIGNAL PB AUDIO (TV/VCR/LINE) SIGNAL MAIN 2/5 Ref No. Position IC1401 TRANSISTORS Q1401 Q1402 Q1403 Q1871 Q1872 Q1873 Q1874 Q1875 CONNECTORS CL1401 CL1402 CL1403 TEST POINTS TP1401 TP1402...
  • Page 21 Main 3/5 Schematic Diagram < TV/VCR Section > REC VIDEO SIGNAL PB VIDEO(TV/VCR/LINE) SIGNAL DVD VIDEO SIGNAL PB VIDEO(TV/VCR/LINE)+DVD VIDEO SIGNAL MAIN 3/5 Ref No. Position IC1301 TRANSISTORS Q1010 Q1301 Q1350 Q1351 CONNECTOR CN1301 1-11-7 1-11-8 TD900SCM3...
  • Page 22 Main 4/5 Schematic Diagram < TV/VCR Section > REC AUDIO SIGNAL PB AUDIO (TV/VCR/LINE) SIGNAL MAIN 4/5 Ref No. Position IC1751 TRANSISTOR Q1701 TEST POINTS TP1701 TP1702 1-11-9 1-11-10 TD900SCM4...
  • Page 23 Main 5/5 Schematic Diagram < TV/VCR Section > DVD VIDEO SIGNAL REC AUDIO SIGNAL PB AUDIO (TV/VCR/LINE) SIGNAL DVD AUDIO SIGNAL MAIN 5/5 Ref No. Position IC1602 IC1801 AA-2 IC1802 TRANSISTORS Q1608 Q1611 Q1612 BB-3 Q1613 Q1803 Q1806 CONNECTORS CN1802 BB-1 CN1803 CC-3...
  • Page 24 Power Supply/AV 1/2 Schematic Diagram < TV/VCR Section > VOLTAGE CHART (Power off mode) Ref. No. IC2601 13.2 12.1 CAUTION ! Fixed voltage ( or Auto voltage selectable ) power supply circuit is used in this unit. IC2602 NOTE : If Main Fuse (F2601) is blown, check to see that all components in the power supply IC2603 The voltage for parts in hot circuit is measured...
  • Page 25 Power Supply/AV 2/2 Schematic Diagram < TV/VCR Section > REC AUDIO SIGNAL DVD VIDEO SIGNAL DVD AUDIO SIGNAL DATA (AUDIO) SIGNAL POWER SUPPLY/AV 2/2 Ref No. Position IC2201 TRANSISTORS Q2202 Q2204 Q2205 Q2207 Q2210 Q2211 Q2614 Q2621 Q2622 Q2623 CONNECTORS CN2401 CN2402 CN2803...
  • Page 26 H.V. Schematic Diagram < TV/VCR Section > H.V. Ref No. Position IC551 TRANSISTORS Q571 Q591 Q592 CONNECTORS CL501A CL502A CL503A CN571 TEST POINTS J520 J521 J522 J535 1-11-17 1-11-18 TD900SCHV...
  • Page 27 CRT Schematic Diagram < TV/VCR Section > REC VIDEO SIGNAL PB VIDEO(TV/VCR/LINE)+DVD VIDEO SIGNAL Ref No. Position TRANSISTORS Q501 Q502 Q503 Q504 Q505 Q506 CONNECTORS CL501 CL504A CN501A TD900SCCRT Function Schematic Diagram < TV/VCR Section > REC AUDIO SIGNAL PB AUDIO (TV/VCR/LINE) SIGNAL DVD AUDIO SIGNAL 1-11-19 TD900SCF...
  • Page 28 DVD Main 1/3 Schematic Diagram < DVD Section > DATA(VIDEO+AUDIO) FOCUS SERVO SIGNAL SPINDLE SERVO SIGNAL TRACKING SERVO SIGNAL SLED SERVO SIGNAL DVD MAIN 1/3 Ref No. Position IC201 IC202 IC301 IC461 TRANSISTORS Q251 Q252 Q253 Q254 CONNECTORS CN201 CN301 CN401 1-11-22 TD900SCD1...
  • Page 29 DVD Main 2/3 Schematic Diagram < DVD Section > DATA(VIDEO+AUDIO) SPINDLE SERVO SIGNAL DATA (AUDIO) SIGNAL FOCUS SERVO SIGNAL TRACKING SERVO SIGNAL DVD VIDEO SIGNAL SLED SERVO SIGNAL DVD MAIN 2/3 Ref No. Position IC101 1-11-23 1-11-24 TD900SCD2...
  • Page 30 IC101 VOLTAGE CHART PIN.NO PLAY STOP PIN.NO PLAY STOP PIN.NO PLAY STOP PIN.NO PLAY STOP PIN.NO PLAY STOP PIN.NO PLAY STOP PIN.NO PLAY STOP PIN.NO PLAY STOP ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- -----...
  • Page 31 DVD Main 3/3 Schematic Diagram < DVD Section > DVD MAIN 3/3 Ref No. Position DVD VIDEO SIGNAL DVD AUDIO SIGNAL DATA (AUDIO) SIGNAL IC102 IC103 IC104 IC105 IC451 IC601 CONNECTOR CN601 1-11-27 1-11-28 TD900SCD3...
  • Page 32 WAVEFORMS Input: NTSC Color Bar Signal (with 1kHz Audio Signal) --- WF1~WF16 DVD Video (Power on (Stop) MODE) --- WF17, WF18 CD (1KHz Play) --- WF19, WF20 INITIAL POSITION: Unplug unit from AC outlet for at least five minutes, reconnect to AC outlet and then turn power on. (Brightness---Center Color---Center Tint --- Center Contrast---Approx 70%) 5 ms 0.5 V...
  • Page 33 WIRING DIAGRAM < TV/VCR SECTION > CN1805 CN2805 CN2801 SENSOR CBA SENSOR CBA CN1802 CL2801 CL1802 SP2801 SP-L WIRING DIAGRAM FOR SECTION 2 (END-SENSOR) (ST-SENSOR) SP1802 SP-R SP-L SPEAKER SPEAKER SP-GND (DECK MECHANISM) BHB300F01014-A,B BHB300F01014-A,B L-CH SP-GND R-CH KEY1 FUNCTION CBA CAPSTAN BTD850F01022B MOTOR...
  • Page 34 WIRING DIAGRAM < DVD SECTION > DVD MECHA SW3001 TRAY-OUT SW3002 CN601 TRAY-IN SPDIF CN301 AUDIO+5V FG-IN SENSOR DVD-ON+3.3V DVD-AUDIO(R) SP(+) FG CBA SP(-) DVD-AUDIO(L) TRAY-OUT TO CN2401 SPINDLE DVD-A-MUTE TRAY-IN MOTOR SLED 8 SL(-) MOTOR DVD-C 9 SL(+) DRIVE CBA DVD-Y CN201 CONTINUE...
  • Page 35 DECK MECHANISM SECTION 20" COLOR TV/DVD/VCR 6720FDD Sec. 2: Deck Mechanism Section I Standard Maintenance I Alignment for Mechanism I Disassembly/Assembly of Mechanism I Alignment Procedures of Mechanism TABLE OF CONTENTS Standard Maintenance ..............2-1-1 Service Fixtures and Tools.
  • Page 36 STANDARD MAINTENANCE Service Schedule of Components 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 Cylinder Assembly Loading Motor Assembly Pulley Assembly B587 Tension Lever Assembly AC Head Assembly B573,B574 Reel (SP)(D2), Reel (TU)(D2) Capstan Motor...
  • Page 37 MECHANICAL ALIGNMENT PROCEDURES Explanation of alignment for the tape to correctly run B. Method to place the Cassette Holder in the tape- starts on the next page. Refer to the information below loaded position without a cassette tape on this page if a tape gets stuck, for example, in the 1.
  • Page 38 1.Tape Interchangeability Alignment Note: To do these alignment procedures, make sure that the Tracking Control Circuit is set to the center position every time a tape is loaded or unloaded. (Refer to page 2-3-4, procedure 1-C, step 2.) Equipment required: Dual Trace Oscilloscope VHS Alignment Tape (FL8NW) Guide Roller Adj.
  • Page 39 1-A. Preliminary/Final Checking and 3. Check to see that the tape runs without creasing at Alignment of Tape Path Take-up Guide Post [4] or without snaking between Guide Roller [3] and AC Head. (Fig. M3 and M5) Purpose: 4. If creasing or snaking is apparent, adjust the Tilt To make sure that the tape path is well stabilized.
  • Page 40 6. Press CH DOWN button on the unit until the CTL Dropping envelope level at the end of track. waveform has shifted from its original position (not the position achieved in step 5, but the position of CTL waveform in step 4) by approximately -2msec. Make sure that the envelope is simply attenuated (shrinks in height) once CTL waveform passes its original position and is further brought in the minus...
  • Page 41 DISASSEMBLY/ASSEMBLY PROCEDURES OF DECK MECHANISM Before following the procedures described below, be sure to remove the deck assembly from the cabinet. (Refer to CABINET DISASSEMBLY INSTRUCTIONS on page 1-7-1.) All the following procedures, including those for adjustment and replacement of parts, should be done in Eject mode;...
  • Page 42 REMOVAL INSTALLATION STEP START- REMOVE/*UNHOOK/ /LOC. PART ADJUSTMENT Fig. No. UNLOCK/RELEASE/ CONDITION UNPLUG/DESOLDER Loading Arm (TU) (+)Refer to Alignment [32] [33] DM2,DM14 Assembly Sec.Pg.2-4-9 [34] [2],[25] M Brake (TU) Assembly DM1,DM15 *(P-7), Brake Belt [35] [2],[25] M Brake (SP) Assembly DM1,DM15 *(P-8) [36] [35]...
  • Page 43 Top View [41] [42] [46] [43] [14] [13] [11] [15] [36] [10] [12] [35] [34] [40] [29] [30] [16] [39] [38] Fig. DM1 Bottom View [20] [33] [32] [24] [26] [27] [25] [23] [28] [22] [21] [31] Fig. DM2 2-4-3 TD951DA...
  • Page 44 (S-1) (S-1) (L-1) (L-3) (L-2) (S-1A) (P-1) Fig. DM5 [46] Fig. DM3 [47] Pin D (L-14) Pin C Pull up Slide Pin A Pin B Slot A (S-2) Slots B Slot A First, while pushing the locking tab as shown at right, slide and pull up the right side on [2] to release Pin A and Pin B from the slots A.
  • Page 45 (S-4) (S-5) [14] (S-6) [16] [15] Desolder from bottom (S-3) Lead with White Stripe Belt View for A Fig. DM7 Fig. DM9 Adj. Screw [11] [18] (L-4) (L-5) (P-3) [17] [13] [19] [12] (P-4) [10] (P-2) (S-7) Pin of [12] Pin of [10] Fig.
  • Page 46 [22] (C-4) (S-8) (C-1) [23] (L-6) [21] (P-5) [20] Cap Belt (P-5) [28] Fig. DM11 When installing [23], install the spring (P-5) to [28] as shown in the left figure, and then install [23] while Pin on pressing the spring (P-5) to bottom the direction of the arrow in of [23]...
  • Page 47 (P-6) [25] [31] Refer to the Alignment (C-3) Section, Page 2-4-9. (S-9) [29] [33] [30] (L-11) [32] (L-10) (L-8) (C-2) [27] [28] [24] [26] (L-9) Fig. DM14 [36] Position of Mode Lever when installed Break belt Pin of [35] (P-7) Pin of [31] Pin of [34] [34]...
  • Page 48 [42] [41] [43] (L-13) Fig. DM16 (P-9) [44] [45] Slide Fig. DM17 2-4-8 TD951DA...
  • Page 49 ALIGNMENT PROCEDURES OF MECHANISM The following procedures describe how to align the Alignment 1 individual gears and levers that make up the tape load- Loading Arm (SP) and (TU) Assembly ing/unloading mechanism. Since information about the state of the mechanism is provided to the System Install Loading Arm (SP) and (TU) Assembly so Control Circuit only through the Mode Switch, it is that their triangle marks point to each other as...