Samsung SV-DVD50 Training Manual Download Page 92

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Circuit Operating Descriptions

7-17

Speed error detection

HSW

generation

Phase error detection

Digital filter

PWM

conversion

Digital filter

Bias value addition

RECCTL generation

Phase detection

Digital filter

Speed error detection

PBCTL amplifier

RECCTL head

(Drum speed gain)

(Drum phase gain)

(Capstan phase gain)

CFG amplifier

VSYNC separation

circuit

composite sync

signal

Vertical sync signal

DPG comparator

DFG amplifier

PWM

conversion

Motor driver

Carrier rejection filter

Drum motor

Capstan motor

CFG signal

DPG signal

DFG signal

Remark The broken line indicates the internal processing of the MICOM

Fig. 7-18 Block Diagram

Summary of Contents for SV-DVD50

Page 1: ...nd Reassembly 6 Alignment and Adjustment 7 Circuit Operating Description 8 VCR Deck Operating Description 9 Troubleshooting 10 Block Diagram 11 Wiring Diagram 12 Schematic Diagrams Manual DVD VCR COMB...

Page 2: ...ad Ass y Separate the Motor Load Ass y 2 When Slider S T are approach the unloading position rotate holder Clutch counterclockwise after inserting screwdriver in the frame s bottom hole in order to wi...

Page 3: ...erwriters Laboratories UL 1270 40 7 With the instrument s AC switch first in the ON position and then in the OFF position measure from a known earth ground metal water pipe conduit etc to all exposed...

Page 4: ...ched out of place or frayed wiring Do not change spacing between a component and the printed circuit board Check the AC power cord for damage 5 Components parts and or wiring that appear to have overh...

Page 5: ...lead last 2 The service precautions are indicated or printed on the cabinet chassis or components When servic ing follow the printed or indicated service precau tions and service materials 3 The comp...

Page 6: ...osure of the assem bly 3 Use only a grounded tip soldering iron to solder or unsolder ESD devices 4 Use only an anti static solder removal devices Some solder removal devices not classified as anti st...

Page 7: ...sheet This gives them the same ground as the sheet 4 Remove the optical pick up block 5 Perform work on top of the conductive sheet Be careful not to let your clothes or any other static sources to to...

Page 8: ...Assy 3 Make solder land 2 points short on Pick up See Fig 1 4 4 Disassembly the Pick up 1 5 2 Assembly 1 Replace the Pick up 2 Remove the soldering 2 points on Pick up 3 Reassemble the Deck Assy PICK...

Page 9: ...ayer Dual Layer Laser Wavelength 650nm 635nm 780nm Track Pitch 0 75um 1 6um Disc Diameter 120mm Disc Thickness 1 2 0 6 x 2 mm 1 2mm Linear Velocity 3 49m s 3 84m s 1 2 1 4m s 2 Disc Formats DVD consis...

Page 10: ...d sound for movies and other video media DVD ROM Read Only Multi functional multi midia software that requires large storage capacity DVD Audio Playback Only High quality sound that exceeds the CD mul...

Page 11: ...ch enables the user to select the scenario 7 Multi Angle Able to view the camera angle you selected among the scenes recorded with multiple camera angles Note The above media features must have the DV...

Page 12: ...eature 1 When Developing the DVD Software various addition and modification is possible DVD Video uses the variable compresion technology the MPEG 2 to compress the moving image optimally mini mizing...

Page 13: ...onventional Dolby Pro Logic and Stereo are all compatible Each separated channels are played back at CD quality sound Frequency band 20Hz 20KHz Linear PCM Pulse Code Modulation Provides the high quali...

Page 14: ...ities 16 9 TV Wide Mode 16 9 Wide Full Screen 4 3 TV Letter Box Mode Pan Scan Mode DVD Video Feature 5 Multi Aspect 4 3 Pan Scan 16 9 Wide 4 3 Letter Box Up to 9 angles of view may be stored enabling...

Page 15: ...l Lock Classify the world into 6 regions and if the DVD Title and the Player s Reginal Code do not agree playback is prohibited Regionnal Coding is optional for the Soft developers Region 0 All Code b...

Page 16: ...as the conventional LD VCD or Original Film Different Authoring Process are used accoring to the Software developers and this may affect the DVD image quality Authoring Process Remark DVD Video Author...

Page 17: ...ts List 3 1 Cabinet Assembly 3 2 3 2 VCR Mechanical Parts Top Side 3 4 3 3 VCR Mechanical Parts Bottom Side 3 6 3 4 DVD Mechanical Parts 3 8 You can search for the updated part code through ITSELF web...

Page 18: ...g Electronics 3 1 Cabinet Assembly DVD DECK S N A 157 BRACKET FRAME S N A 153 UT01 101 155 701 FUNCTION PCB 602 S M P S PCB TM401B 1 21 22 S N A Service Not Available 157 VCR DECK S N A 3 2 601 MAIN P...

Page 19: ...VD V3500 03 SECCOM43 LD601A AC61 21009A HOLDER LED X 9 POM M90 44 BLK TM401B AK97 00463A ASSY CON BOARD HIPS94HB PBS T0 2 SV DVD5 UT01 AK59 00008E REMOCON SV DVD55 SAMSUNG MODELS 1 21 200 601 SV DVD50...

Page 20: ...tronics 3 2 VCR Mechanical Parts Top Side G001 G555 G510 G480 K546 G680 G681 B410 B475 B440 B448 B452 G546 G060 G520 G527 K188 K182 K110 K240 K248 K350 K330 K140 K340 G070 K470 B474 B473 K250 K530 K49...

Page 21: ...WSP PH M2 6 L5 0 ZPC G520 AC66 00033A LEVER 9 GUIDE ASS Y TS 10 G527 AC61 60553A SPRING ETC GUIDE 9 X 9 SUS304 WPB 0 25 G530 AC33 00007A HEAD FE HVFHPOO43A G546 AC66 00005A LEVER FL DOOR TS 10 POM NAT...

Page 22: ...Exploded View and Parts List 3 6 Samsung Electronics 3 3 VCR Mechanical Parts Bottom Side G542 B462 B560 B501 B484 B561 B488 B500 B456 B458 B464 B468 K222 K200 K225 K221 B478 B570 B460 B489...

Page 23: ...ECC E20 20 1 B484 AC66 00030A GEAR LOADING DR ASS Y TS 10 POM SWPB B488 AC66 00023A LEVER S LOADING TS 10 POM NAT B489 AC66 00021A LINK LOADING S TS 10 SECC E20 20 0 8 B500 AC66 00024A LEVER T LOADING...

Page 24: ...Exploded View and Parts List 3 8 Samsung Electronics 3 4 DVD Mechanical Parts H107 S N A H105 H106 H103 H108 H104 H211 H241 H102 H206 H207 H206 H203 H202 H209 H210 900 900 903 903 904 H204 H205...

Page 25: ...ULAR CR T1 2 4 3 1 2X25 1 B H106 AK66 00008A GEAR TRAY DP 9 POM H107 AK66 00009A SLIDER HOUSING DP 9 POM H108 AK63 00008B TRAY DISC DP 9 ABS BLK DP 9 H202 AK73 00005A RUBBER INSULATOR DP 9 BUTYL RUBBE...

Page 26: ...2203 005148 C CERAMIC CHIP 100nF 10 16V X7R TP 1608 C330 2203 000975 C CERAMIC CHIP 47nF 10 25V X7R TP 1608 C331 2203 005148 C CERAMIC CHIP 100nF 10 16V X7R TP 1608 C332 2203 000975 C CERAMIC CHIP 47...

Page 27: ...35V GP TP 4x5 5 C530 2203 005148 C CERAMIC CHIP 100nF 10 16V X7R TP 1608 C535 2203 005148 C CERAMIC CHIP 100nF 10 16V X7R TP 1608 C536 2203 005148 C CERAMIC CHIP 100nF 10 16V X7R TP 1608 C537 2401 000...

Page 28: ...RECTIFIER 1N4002 100V 1A DO 41 TP D688 0401 000101 DIODE SWITCHING 1N4148 100V 200mA DO 35 D692 0402 000127 DIODE RECTIFIER 1N4002 100V 1A DO 41 TP D6P01 0401 000101 DIODE SWITCHING 1N4148 100V 200mA...

Page 29: ...701 000181 INDUCTOR AXIAL 33uH 5 2 4x3 4mm L814 AC27 92001M COIL INDUCTOR RH3 5X6 5RS BEAD RADIAL LD601 0601 000517 LED IR RECTANGULA 4x6 0mm 75mW 6V 950 PC1 2203 005148 C CERAMIC CHIP 100nF 10 16V X7...

Page 30: ...ohm 5 1 16W DA TP 1608 R3Q2 2007 000090 R CHIP 10KOHM 5 1 16W DA TP 1608 R3Q3 2007 000076 R CHIP 330ohm 5 1 16W DA TP 1608 R3Q4 2007 001056 R CHIP 6 2Kohm 5 1 16W DA TP 1608 R3Q5 2007 000076 R CHIP 33...

Page 31: ...TP 1608 R821 2007 000134 R CHIP 33Kohm 5 1 16W DA TP 1608 R822 2007 000094 R CHIP 22Kohm 5 1 16W DA TP 1608 R825 2007 000084 R CHIP 4 7Kohm 5 1 16W DA TP 1608 R839 2007 000074 R CHIP 100ohm 5 1 16W DA...

Page 32: ...00nF 10 16V X7R TP 1608 SC36 2203 000257 C CERAMIC CHIP 10nF 10 50V X7R TP 1608 SC38 2203 005148 C CERAMIC CHIP 100nF 10 16V X7R TP 1608 SC4 2203 001652 C CERAMIC CHIP 470nF 80 20 16V Y5V TP SC41 2203...

Page 33: ...100nF 10 16V X7R TP 1608 ZC106 2203 005148 C CERAMIC CHIP 100nF 10 16V X7R TP 1608 ZC107 2203 005148 C CERAMIC CHIP 100nF 10 16V X7R TP 1608 ZC108 2203 005148 C CERAMIC CHIP 100nF 10 16V X7R TP 1608 Z...

Page 34: ...ZR46 2007 000070 R CHIP 0ohm 5 1 16W DA TP 1608 ZR48 2007 000070 R CHIP 0ohm 5 1 16W DA TP 1608 ZR5 2007 000078 R CHIP 1Kohm 5 1 16W DA TP 1608 ZR56 2007 000070 R CHIP 0ohm 5 1 16W DA TP 1608 ZR57 20...

Page 35: ...TP 2 4X6 4MM R1P103 2001 000362 R CARBON 150OHM 5 1 8W AA TP 1 8X3 2MM R1P104 2001 000449 R CARBON 2 2KOHM 5 1 8W AA TP 1 8X3 2M R1P105 2001 000969 R CARBON 75OHM 5 1 8W AA TP 1 8X3 2MM R1P109 2001 00...

Page 36: ...tion of arrow REMOVE 3 SCREWS Fig 5 1 Cabinet Top Removal 5 1 3 Ass y Front Panel Removal RELEASE 4 HOOKS RELEASE 3 HOOKS Top View Bottom View Fig 5 3 Ass y Front Panel Removal 5 1 2 Bottom Cover Remo...

Page 37: ...OVE 4 SCREWS REMOVE 1 SCREW REMOVE 3 SCREWS MAIN PCB S M P S PCB DVD DECK VCR DECK Fig 5 5 Chassis Removal 5 1 6 VCR Main PCB Removal REMOVE 3 SCREWS MODE SWITCH When installing the ass y full deck on...

Page 38: ...Disassembly and Reassembly 5 3 Samsung Electronics 5 2 Circuit Board Locations S M P S PCB FUNCTION PCB MAIN PCB Fig 5 7 Circuit Board Locations...

Page 39: ...and Reassembly Samsung Electronics 5 3 VCR Deck Parts Locations 5 3 1 Top View Fig 5 8 Top parts Location 1 GEAR FL CAM MOTOR LOADING ASS Y LEVER FL ARM ASS Y HOLDER FL CASSETTE ASS Y LEVER FL DOOR S...

Page 40: ...ectronics Fig 5 9 Top Parts Location 2 FE HEAD CYLINDER ASS Y ACE HEAD ASS Y LEVER UNIT PINCH ASS Y LEVER 9 GUIDE ASS Y LEVER TENSION ASS Y BAND BRAKE ASS Y DISK S REEL LEVER S BRAKE ASS Y GEAR IDLE L...

Page 41: ...y Samsung Electronics 5 3 2 Bottom View Fig 5 10 Bottom Parts Location GEAR JOINT 1 GEAR JOINT 2 BRAKET GEAR MOTOR CAPSTAN ASS Y LEVER T LOAD ASS Y GEAR LOADING DRIVE LEVER S LOAD ASS Y HOLDER CLUTCH...

Page 42: ...R in the same time to release hooking from Main Base until the Boss A of Holder FL Cassette Ass y is taken out from the Rail B 3 Lift the Holder FL Cassette Ass y in this time you have to grasp the Le...

Page 43: ...5 4 3 Slider FL Drive Gear FL Cam Removal 1 Pull the Slider FL Drive to the front direction 2 Remove the Slider FL Drive in the direction of arrow Refer to Fig 5 13 3 Remove the Gear FL cam Note When...

Page 44: ...m wheel GEAR WORM WHEEL Fig 5 16 Gear Worm Wheel Removal 5 4 6 Cable Flat Removal 1 Remove the Drum connecting part of Cable Flat from Connector Waffer 2 Remove the Loading Motor connecting part of Ca...

Page 45: ...of Gear Joint 2 as shown Fig 5 20 Refer to Timing point1 2 Confirm the Timing Point 2 of the Gear Joint 2 and Slider Cam SCREW BRAKET GEAR GEAR JOINT 1 GEAR JOINT 2 Fig 5 19 Bracket Gear Gear Joint 1...

Page 46: ...ing Refer to Timing Point 3 LEVER LOAD S LEVER LOAD T LEVER LOAD S LEVER LOAD T PIN A PIN C PIN B PIN D SLIDER CAM TIMING POINT 2 TIMING POINT 1 TIMING POINT 3 Fig 5 22 Gear Loading Drive Slider Cam L...

Page 47: ...y be sure to apply Grease on the post 2 Take care not to touch stain on the felt side and not to be folder and broken Band brake Ass y 3 After Lever Tension Ass y seated Rotate stopper of Main Base t...

Page 48: ...EVER IDLE A HOOK C B Fig 5 26 Gear Idle Ass y Removal 5 4 13 Lever Brake S T Ass y Removal 1 Release the Hook A and the Hook B C in the direction of arrow as shown in Fig 5 25 2 Lift the Lever S T Bra...

Page 49: ...Holder Clutch Ass y down with exces sive force Just insert Holder Clutch Ass y into post center with dead force and Rotate it smoothly Be sure to confirm that spring is in the slit of Gear Center Ass...

Page 50: ...an gular holes on Main Base as shown in Fig 5 30 2 Lift the Lever Up Down Ass y about 35 Refer to Fig 5 30 3 Insert Ring of the Gear Center Ass y in the Guide of the Lever Up Down Ass y 4 Insert the G...

Page 51: ...e to apply grease on the post pinch roller SPRING PINCH DRIVE LEVER UNIT PINCH ASS Y PLATE JOINT Fig 5 32 Lever Unit Pinch Ass y Plate Joint Spring Pinch Drive Removal 5 4 20 Lever 9 Guide Ass y Remov...

Page 52: ...2 ACE Head Removal 1 Pull out the FPC from connector of ACE Head Ass y 2 Remove the screw 3 Lift the ACE Head Ass y SCREW HEAD ACE ASS Y Fig 5 35 ACE Head Removal 5 4 21 FE Head Removal 1 Remove the s...

Page 53: ...Deck 3 Lift the Cylinder Ass y Assembly 1 Match the 3 holes in the bottom of Cylinder ass y to the 3 holes of Main Base as attending not to drop or knock the Cylinder ass y 2 Tighten the 1 Screw 3 Mat...

Page 54: ...ion of arrow as shown detail drawing 3 Assemble the Damper Capstan Note After tightening screws check if there is gap between the head of screws and the top side of Main Base There should have no gap...

Page 55: ...unwinded tape Refer to Fig 5 43 If you rotate Gear Worm continuously when tape is in state of unwinding you may cause a tape contamination by grease and tape damage Be sure to wind the unwinded tape i...

Page 56: ...8 GUIDE SHAFT CAPSTAN SHAFT 9 GUIDE POST 3 GUIDE POST GUIDE ROLLER S T O O O O O O O CYLINDER ASS Y O O O O O O O O O FE HEAD O O O O O O O ACE HEAD O O O O O O O O O PINCH ROLLER O O O O O O O O O PO...

Page 57: ...the Slider Housing in the direction arrow A 2 When the Tray Disc comes out a little pull it in the direction arrow B by hand 3 Pull the Tray Disc to disassemble while simultaneously pushing 2 Stoppers...

Page 58: ...cs 5 6 2 Assy P U Deck Removal 1 Disconnect DCN2 DCN3 2 Lift down the Assy P U Deck while simultaneously pushing 2 Hooks in the direction of arrow A B Fig 5 45 Assy P U Deck Removal DCN2 DCN3 ASSY P U...

Page 59: ...ow A and lift up Pulley Gear 3 Push the Slider Housing in the direction arrow B and lift up the Gear Tray 4 Lift up the Slider Housing 5 Remove 2 Screws and lift down the Motor Load Assy 6 Remove Clam...

Page 60: ...5 25 Samsung Electronics 5 6 4 Sub Chassis Removal 1 Remove the Soldering of Motor Feed wire 2 Remove the 4 Screws 3 Lift up the Ass y Brkt Deck Fig 5 47 Sub Chassis Removal 4 SCREWS ASSY BRAK DECK SO...

Page 61: ...Remove 3 Screws and 3 Holder Cam Skew 3 Remove Shaft Pick Up and Pick Up Assy 4 Remove Gear Feed A 5 Remove 2 Screws 6 Remove Motor Feed Ass y 7 Remove 3 Screws 8 Remove Motor Spindle Fig 5 48 Ass y B...

Page 62: ...replacing the cylinder ass y be sure to adjust the X Point and Head switching adjustment 4 How to adjustment Intermittently short circuit the Test Point on Main PCB with pincers to the adjustment mode...

Page 63: ...6 2 Alignment and Adjustments Samsung Electronics 6 1 1 b TEST location for adjustment mode setting Fig 6 2 Main PCB Top View Short Circuit for few seconds and release Just one time...

Page 64: ...set the unit will operate Table 6 1 NVRAM Option Table CNG OK SAVE RETURN 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42...

Page 65: ...6 4 Alignment and Adjustments Samsung Electronics 6 2 DVD Adjustment 6 2 1 Location of Test Point Fig 6 5 Location of test Point Main PCB Top Side RIC1 RIC1...

Page 66: ...pec and Test Point 6 2 2 Skew Adjustment Test Disc Adjustment Spec Test Point Adjustment Location TDV 533 ENV Ass y Deck Top Side Chapter 14 Flat Waveform DVD Main PCB Top Side See Fig 6 6 See Fig 6 5...

Page 67: ...illoscope Range as follows Voltage 50mV Div Frequency 10m Sec 3 Adjust the Screws A and B See Fig 6 6 using a Hex screwdriver until you obtain a Flat Waveform and the picture is stable Then go to Chap...

Page 68: ...he height of the tape guide and prevent damage do not apply excessive force onto the main base Fig 6 8 Location of Tape Transport Adjustment Fig 6 9 Tape Travel Diagram CYLINDER ASS Y TAKE UP REEL DIS...

Page 69: ...is still observed at the tape guide perform the tilt adjustment of the ACE head 1 ACE Head Assembly Adjustment a ACE HEAD HEIGHT ADJUSTMENT 1 Run the alignment tape Color bar in the playback mode 2 O...

Page 70: ...er flange of tape guide as shown in Fig 6 12 B 3 If a curl or wrinkle of the tape occurs slightly turn the screw A tilt adjust on the ACE head ass y 4 Reconfirm the ACE head height Fig 6 12 Tape Guide...

Page 71: ...ns then adjustment is operates automatically See Fig 2 1 4 Connect the CH 1 probe to Envelope the CH 2 probe to H D switching pulse and then trigger to CH 1 5 Insert the driver into the X Point adjust...

Page 72: ...ope b Minimum output of the video RF envelope at the entrance side c Minimum output of the video RF envelope at the center point d Maximum output of the video RF envelope at the exit side 4 If the sec...

Page 73: ...pe CH 1 to the Envelope and CH 2 to the H D SW Pulse for triggering 8 Turn the guide roller heads with a flat head driver to obtain a flat video RF envelope as shown in Fig 6 16 Fig 6 16 Guide Roller...

Page 74: ...Changes from RPS to Play Mode 4 Envelope Check 1 Make recordings on T 120 E 120 and T 160 E 180 tape Make sure the playback output envelope meets the specification as shown in Fig 6 18 2 Play back a...

Page 75: ...ass y drives the disk reel S T through gear idler by rotation of gear center ass y 3 Brake is operated by slider cam at FF REW mode 4 Transportation of accurate driving force is done by gears Gear Cen...

Page 76: ...s Vp Np REGULATOR Common power Ex 220V 50Hz Fig 7 1 Linear Power Supply Waveform Description Vs t 0 Fig 7 2 Vs t 0 Fig 7 3 Vout t 0 Fig 7 4 Input Common power to transformer Vp The output Vs of transf...

Page 77: ...d by margin design Greater core size and condensor capacity are ne eded because the transformer works on a single power frequency b S M P S Switch Mode Power Supply v Vreg Vout 0 t Change by common po...

Page 78: ...occurs at switch off because of the 1st winding of transformer V LI xdi dt LI Leakage Induction A very high residual voltage exists on both terminals of SCS11A because dt is a very short 2 SNUBBER ci...

Page 79: ...rrent down IC1S03 of A K current down IC1S03 Diode current down IC1S03 C E current down IC1S03 C E voltage up IC1SS2 F B voltage up Out Duty up Transformer 1st current up Transformer 1st power up Vout...

Page 80: ...Circuit 33V Rectified Smoothing Circuit 5V Rectified Smoothing Circuit 15V Rectified Smoothing Circuit 5V Rectified VoltageCircuit X2 12V Rectified VoltageCircuit 9V Rectified VoltageCircuit O U T P...

Page 81: ...inputs the detected output from the tape and mechanism protection sensor and protects the VCR and tape against abnormal operation Fig 7 11 is a simplified system control block diagram The system cont...

Page 82: ...Circuit Operating Descriptions 7 7 Fig 7 12 Block Diagram...

Page 83: ...ontrol the phase of drum and capstan motor 6 Record Safety Tap Detection Detects the safety tab on the rear of a cassette to prevent a prerecorded program from being erased 7 Loading Unloading control...

Page 84: ...tor Drive IC is designed to drive Loading Motor Capstan Motor Cylinder Motor in one IC Table 7 2 Motor Control Logic POSION CAM S W START ACTION MODE A B C SEN STANBY 0 0 0 0 Eject POWER OFF 0 0 0 1 U...

Page 85: ...fast forward rewind forward search reverse search still mode etc Indication output PLAY lights in LED display Output at IC601 Pin 25 CAP F R Hi 8 Trick Play Mode Trick play modes are classified into...

Page 86: ...nter blinks in LED display Output at IC601 Pin 25 CAP F R Hi 14 Record Mode Must use a cassette with the safety tab Index signal is recorded on the control track of the tape at the start of recording...

Page 87: ...ch System Index search Find a certain point of the tape using high speed REW FF and start playback Fig 7 14 The detection is obtained by adjusting the width of the control pulse duty cycle When record...

Page 88: ...on state in the reel emergency Fig 7 15 Reel and Cylinder Lock T END S END Sensor R676 R677 66 75 74 98 99 R679 R678 R691 R682 R675 C633 C634 21 Cylinder Lock Sensor Cylinder lock sensor detects abnor...

Page 89: ...ape direction so the counter counts up when the CAP F R signal is Hi and the counter counts down when the CAP F R signal is Low By counting the control pulse the counter data is supplied to the VF dis...

Page 90: ...of the IC601 during PB period in Slow mode These port is applied to Video IC to operate the trick play 24 Timer OTR Control The timer can preset 6 programs in one year including daily and weekly progr...

Page 91: ...ed of the cylinder motor The speed is kept at a constant 1500 RPM and the phase determines the mechanical position relative to the vertical Sync signal The capstan servo loop controls the phase and sp...

Page 92: ...BCTL amplifier RECCTL head Kp Kp Kv Kv Drum speed gain Drum phase gain Capstan phase gain CFG amplifier VSYNC separation circuit composite sync signal Vertical sync signal DPG comparator DFG amplifier...

Page 93: ...ided CFG signal And than it does in playback mode by comparing HD S W which is synchronized with DFG and DPG with PB CTL signal The latch signal for the phase error data in record mode is the divided...

Page 94: ...rotation phase and speed of the drum When the error is zero the PWM circuit outputs a waveform with a 50 duty cycle The phase counter error detector compares the phase of the DPG pulse tach pulse whi...

Page 95: ...ill slow The value is varied by tracking up down key in trick play mode the variable range from 3H to 12H In trick play mode the V LOCK pulse position of CH 1 is variable but CH 2 is fixed During sear...

Page 96: ...AGC detector so that the output is constant approx 2Vp p The output signal of AGC is clamped by the FBC Feed Back Clamp cir cuit This signal appears at pin 26 after being amplified at the internal vi...

Page 97: ...r the white peak The actual device which constitutes the FM modulator is a stable multivibrator This multivibrator generates a sine wave output of variable frequency The frequency of sine wave is gove...

Page 98: ...al is applied to FM AGC 2 FM AGC AMP At the FM AGC Amp FM signals are automatically balanced One of the AGC circuit outputs is fed to AGC detector circuit which detects signal level fluctuations The d...

Page 99: ...eturns the emphasized high frequency component to the original value 6 Non Linear De Emphasis Circuit This circuit is the counter part of the dynamic pre emphasis circuit during recording The characte...

Page 100: ...s of output components which are the added frequency of 5 06 4 43 9 49MHz and the difference frequency component 627KHz Added frequency is rejected by the 1 3MHz LPF and the 627KHz down converted chro...

Page 101: ...self during SP and SLP provides a some what better S N ratio 3 Four 4 Phase Rotation CH1 is advanced 90 degrees every channel while CH2 is delayed 90 degrees When the frequency is set to 627KHz if pha...

Page 102: ...ignal and converted into 5 06MHz 627KHz signals 2 Main Converter Inside of IC the main converter converts the 627KHz rotational chroma signal to a 4 43MHz non rotational signal The two inputs of this...

Page 103: ...ircuit REC EQ circuit and a PB EQ circuit Hi Fi and Linear audio share the same input selector output selector and mute circuit 1 REC Mode L CH Only IN SEL REC AMP INPUT ALC LPF PNR MOD 26 REC FM OUT...

Page 104: ...ignals exceeding the size limit to max deviation of 150KHz 7 VCO Voltage Control Oscillation It is a modulation function that oscillates 1 3MHz L CH and 1 7MHz R CH 8 RF LPF It is a function to elimin...

Page 105: ...d without properly treating the damage on Hi Fi envelope caused by scratch on the tape noise occurs In order to improve this noise occurrence DO DET compensate the drop out using the same methode of c...

Page 106: ...uses magnetic recording device it only records limited size and as the size of input signal increases distortion increases To prevent this occurance mark sure the signal does not get bigger even if t...

Page 107: ...e considered when designing rec amp The REC amp should be the opposite to playback characteristics OUTPUT PB AMP INPUT R1 R2 Fig 7 29 REC Amp 7 OSC Oscillation Oscillation frequency is 70KHz It s size...

Page 108: ...hannel 4 by an RF modulator so that the signal can be received by conventional TV receivers 2 Tuner modulator block As explained this model is designed in one package to contain a RF MODULATOR BLOCK T...

Page 109: ...nd 3ch 61 25MHz 4ch 67 25MHz B PLL synthesized audio FM 4 5MHz C The 4 43MHz reference frequency for PLL can either be generated internally or input from an external source Fig 7 31 Modulator Section...

Page 110: ...e rejection characteristic which results in a better band characteris tic D MOP IC Mixer OSC PLL It consists a VHS and UHF OSC and mixer circuit We applied a double balance mixer to have better reject...

Page 111: ...D FM DETECTOR After removing AM signal in the limiter AMP amplified SIF signal is applied FM detector This FM detector is PLL detecting type E AFT DETECTER AFT automatically controls the OSC frequency...

Page 112: ...Fig base band spectrum First the SAP signal only is extracted using SAP BPF Then this is subjected to FM detection Finally residual high frequency components are removed and frequency characteristic...

Page 113: ...Descriptions 7 38 fH 2fH 3fH 4fH 5fH 6fH 6 5fH fH f15 734KHz f 3 15 50 25 50 PEAK DEV KHz L R 50 15KHz 25 AM DSB SC PILOT 5 L R dbx TV NR SAP dbx TV NR FM 10KHz 50 10KHz TELEMETRY FM 3KHz Fig 7 34 Ba...

Page 114: ...cting sync if no sync is detected a blue screen is displayed In other word the OSD circuit displays character on the video when there is a video signal or on blue screen when there is no video signal...

Page 115: ...unnecessary components around the sync signal are muted low chroma signal is output to Pin 18 after through Buffer This mute circuit also has the function of remove unnecessary component during vertic...

Page 116: ...Circuit Operating Descriptions 7 41 3 Block Diagram Fig 7 38 LA70100M Block Diagram...

Page 117: ...AUDIO AMP IC501 HI FI AUDIO IC301 A V ONE CHIP JC801 SCART2 A V IN JK701 FRONT JACK A V IN IC601 VCR u COM DVD L VCR H Fig 7 39 Block Diagram Table 4 Output Signal Switching Condition Block Input Sig...

Page 118: ...s the key commands of front panel or instructions of remote control through communication with Micom IC601 MN101DF06 of front and controls the devices on board to execute the corresponding commands af...

Page 119: ...C1 126 DSPCS DIC1 2 DVD1CS ZIC1 208 CSB SIC1 10 0 Low before trial So to speak the bus is used by time division as shown in Fig 7 41 Two and more devices can t be accessed simultaneously CH1 CH2 CH3 C...

Page 120: ...7 42 shows the flow of signal generated by the pick up A B C D signals detected from pick up are converted in to RF signal A B C D via RF summing AMP PICK UP RE SUM AGC RF EQ DPD TE Mux ENV FOK DEFECT...

Page 121: ...F EQ_FREQ EQ_BOOST EQG_CEN X z b B v Z Fig 7 43 The control parameters of DVD EQ and CD EQ are as follows 1 DVD CD EQ control parameter EQG_CEN EQ_BOOST Changes the gain of peak frequency with EQ freq...

Page 122: ...eated from Pick up 3 SLED Linked SERVO When the tracking actuator inclines outwardly as the object lens follows the track during play the SLED motor moves slightly and counteracts the incline 4 CLV SE...

Page 123: ...e same in CD and DVD Fig 7 45 b Play When focus loop closes the loop during focus servo on both pin 65 and pin 75 of SIC1 are controlled by VREF voltage approx 1 65V and pin 26 27 of SIC3 are approxim...

Page 124: ...SERVO Normal play mode Move SLED motor slightly by means of PWM signal in SIC1 pin 26 as the tracking actuator moves along with track during play Control to move the entire Pick up as the tracking ac...

Page 125: ...last data read from disc until now It takes some times to jump to the previous track and return to the original jump location again The memory will have an empty space because A V decoder reads out d...

Page 126: ...3 Waveform Description It measures the timing that data processed in SIC1 at DVD playback CH1 CH2 CH3 CH4 Fig 7 47 CH1 STROBE SIC1 123 CLOCK CH2 REQ SIC1 124 DATA REQUEST CH3 DACK SIC1 125 DATA ACKNO...

Page 127: ...ing of 8bit video signal of ITU R601 format The separate signal is encoded to NTSC PAL by control of MIC1 The above signals which are CVBS Composite Video Burst Synchronized G GREEN Y PIN139 Y S_VIDEO...

Page 128: ...d via post filter and amplifier CD and VCD are outputted with only 2 channels audio data and transmit them to Data 0 If DVD of multichannel Source disc if is downmixed and transmit them to Data0 If yo...

Page 129: ...isn t compressed so it is called CD DA LPCM data The 2 channels data is converted through audio decoder 2 channel data and Data 0 and are outputted in digital audio interface Via IEC 958 output proces...

Page 130: ...in Fig 8 1 the mechanism of VCR is configured with five main blocks and each operation is precisely controlled by the microcomputer built in the system control section First load a video cassette tape...

Page 131: ...and reproduce a control signal at lower side of the tape and an audio erase head to erase only the audio signals and perform after recording in parallel with the audio head are provided at T reel sid...

Page 132: ...record playback fps rps modes the reel take up torque is controlled by the clutch mechanism thereby the tape fed by the capstan is taken up with a proper torque In the FF and REW modes the clutch ente...

Page 133: ...eo cassette is horizontally moved 5 The cassette tape is vertically moved In this case the cassette lid is opened 6 The cassette tape is set on the reel disc and loading operation completes 7 The cass...

Page 134: ...ase the tension post loading tape guide capstan motor and the No 9 guide are positioned inside of the tape in the cassette case Fig 8 7 Cassette IN OUT Mode Cylinder T slant guide T guide roller ACE h...

Page 135: ...ondition Fig 8 8 Tape Loading Cylinder T guide roller ACE head Tape guide Pinch roller No 9 guide No 8 guide Capstan Guide post Guide post S guide roller FE head Tension post Tape guide 8 4 4 Playback...

Page 136: ...according to the rotating direction of the capstan motor As a result the T reel rotates in the FF mode or the S reel rotates in the REW mode thus taking up the tape to the rotating reel Fig 8 9 FF REW...

Page 137: ...thereby stabilizing the tape tension The tape fed by the capstan is taken up around the T reel The T reel is driven with a constant torque generated by transmitting rotation of the capstan motor to th...

Page 138: ...microcomputer controls signal switchings for each circuit according to the mechanism status Remote control Remote Main microcomputer Loading motor drive broken safety tab Tape stsrt sensor Take up Sup...

Page 139: ...ding drive gear Pinch drive lever Tension drive lever S brake T brake Up Down lever FL arm lever Mode SW No 9 guide S T slider Pinch lever Tension lever Cassette holder FL cam gear Cam slider Fig 8 14...

Page 140: ...ever T brake soft Idle lever assembly S brake off Tension arm S slider assembly Pinch assembly Loading motor FL cam gear T loading lever assembly S loading lever assembly Loading drive gear Tension dr...

Page 141: ...VCR Deck Operating Description 8 12 Samsung Electronics Fig 8 14 Mecha Timing Chart...

Page 142: ...g REW The small load is given to S REEL DISK and no load is given to T REEL DISC 4 FF REW 2 This mode is performed when The tape load is large during performing FF The tape load is small during perfor...

Page 143: ...AIN BRAKE STOP 2 The large load is given to S REEL DISC Fig 8 18 T BRAKE 1 OFF BRAKE PLAY FF REW 1 T BRAKE is detached from T REEL DISC completely So T REEL DISC is free Fig 8 19 2 SOFT BRAKE UNLOADIN...

Page 144: ...eck Operating Description Samsung Electronics 8 15 Fig 8 20 3 REVERSE SEARCH BRAKE RPS The medium load is given to T REEL DISC Fig 8 21 4 MAIN BRAKE on the loading STOP 2 The large load is given to T...

Page 145: ...and the cam slider slides after operation of the cassette holder Then the mode switch also rotates synchronized with the cam slider and outputs a signal corresponding to each mode This signal is trans...

Page 146: ...er assembly is enabled to be engaged with both S and T reel discs 3 When a cassette is inserted the lock lever of cassette holder is released from the stopper the cassette holder moves the FL arm leve...

Page 147: ...hes the position II loading unloading modes the mechanism enters the loading status and operates as described below 1 S T sliders are moved through the loading drive gear and trun on the tension post...

Page 148: ...ssed in the stop mode the mechanism enters the eject mode 2 IC601 controls cylinder motor drive IC to make the cylinder motor rotates 3 IC601 makes the loading motor rotate in the reverse direction an...

Page 149: ...stop mode position V and each motor stops 2 The mechanism status is as follows 1 The S T guide rollers are in the loading status 2 The pinch roller is kept away from the capstan 3 The tension post is...

Page 150: ...capstan driving force is directly transmitted to the reel disc 5 Brakes for the reel discs are as follows VI position FF REW 1 mode S Brake soft brake T Brake off VII position FF REW 2 mode S Brake of...

Page 151: ...e position IV The mechanism works as follows 1 The pinch roller moves toward the capstan side and press fits the capstan 2 The No 9 guide is loaded once and then returned immediately 3 The tension pos...

Page 152: ...In the slow mode the capstan motor rotates continuously in the intermittent driving FPS mode 1 When the FF button is pressed in the playback mode the mechanism enters the FPS mode forward picture sea...

Page 153: ...oped for 250ms the capstan motor is rotated in the reverse direction for a constant time and the idle gear is swung toward the S reel disc side Then the loading motor rotates in reverse direction and...

Page 154: ...ntrols the audio circuit and video circuit to set the record enable mode 4 Recording mute is released thus setting the recording status The CTL signal is output for recording REC PAUSE mode 1 When PAU...

Page 155: ...udio DAC IC701 PT6959 LED Drive DT701 VIC1 LA73054 Video Amp 6CH S W AUDIO L R AUDIO L R ZIC3 MBM29LV800BA IMB Flash Memory ZIC8 TC74VHCT125 Level Shifter SIC1 S5L1455X DVD CD Processor Digital IC802...

Page 156: ...Samsung Electronics 11 1 11 Wiring Diagram...

Page 157: ...ed Note Special note Most semiconductor devices are electrostatically sensitive and therefore require the special handling techniques described under the electrostatically sensitive ES devices section...

Page 158: ...Schematic Diagrams 12 2 Samsung Electronics 6 1 S M P S...

Page 159: ...Schematic Diagrams Samsung Electronics 12 3 6 2 Power Drive...

Page 160: ...Schematic Diagrams 12 4 Samsung Electronics DT701 6 3 Display Function...

Page 161: ...Schematic Diagrams Samsung Electronics 12 5 6 4 System Control Servo...

Page 162: ...Schematic Diagrams 12 6 Samsung Electronics 6 5 A V...

Page 163: ...Schematic Diagrams Samsung Electronics 12 7 6 6 Hi Fi...

Page 164: ...Schematic Diagrams 12 8 Samsung Electronics 6 7 A2 NICAM...

Page 165: ...Schematic Diagrams Samsung Electronics 12 9 6 8 SECAM Option...

Page 166: ...Schematic Diagrams 12 10 Samsung Electronics 6 9 OSD VPS PDC...

Page 167: ...Schematic Diagrams Samsung Electronics 12 11 6 10 TM...

Page 168: ...Schematic Diagrams 12 12 Samsung Electronics 6 11 Input Output...

Page 169: ...Schematic Diagrams Samsung Electronics 12 13 6 12 DVD AV Decoder...

Page 170: ...Schematic Diagrams 12 14 Samsung Electronics 6 13 DVD Servo...

Page 171: ...Schematic Diagrams Samsung Electronics 12 15 6 14 DVD Audio Video...

Page 172: ...wer with in normal value is the SMPS to Main connector properly connected End repairs Check power and front connector Check the circuity around the clock Check the circuity around IC601 reset Check th...

Page 173: ...TE IN PLAY MODE CHECK TIMER CHECK IC601 XT602 SEE VIDEO MISSING IN EE MODE NO NO NO YES NO PB VIDEO SEE VIDEO MISSING IN PLAY MODE NO YES YES YES DOES NOT OPERATE OR OPERATES BUT STOP SOON YES VCR Sec...

Page 174: ...PT601 PT602 SEE CAPSTAN DOES NOT ROTATE NO DC STOP MODE YES PULSE YES A RECORD MODE DOESN T OPERATE PLAY OPERATION LOAD VCR WITH A BLANK TAPE AND PRESS RECORD BUTTON REC MODE SAFETY TAB D REC A H IC60...

Page 175: ...APSTAN MOTOR ROTATION SEE CAPSTAN DOES NOT ROTATE SEE MECHANISM DOES NOT OPERATE IN PLAY MODE YES F FWD ROTATE CHECK MECHANISM VCR Section FWD SEARCH DOESN T OPERATE PLAY OPERATION PRESS F FWD FOR FOR...

Page 176: ...IC601 38 LOW 0V IC601 39 HIGH 5V IC601 38 HIGH 5V IC601 39 LOW 0V CHECK CASSETT LOADING MECHANISM YES YES NO CN604 8pin 12V YES NO YES VCR Section PLACE VCR IN STOP MODE CHANGE IC301 CHECK TM BLOCK T...

Page 177: ...REC FM signal CHECK CN301 CONNECTION NO YES VCR Section VIDEO MISSING IN PLAY MODE VIDEO EE MODE OPERATION PLACE THE VCR PLAY MODE CHANGE IC301 CHECK IC6P01 Q6P01 R6P10 CHECK VIDEO HEAD CHECK Q301 C3...

Page 178: ...C LINE SEE PAGE 9 6 VIDEO MISSING IN RECORD MODE NO NO NO YES YES YES CHECK XT301 CHANGE XT301 NO NO CHANGE IC301 COLOR MISSING IN PLAY MODE FM ENV IC301 25 COLOR MONITOR IC301 58 COLOR KILLER IC301 3...

Page 179: ...6P05 C6P04 C6P05 YES NO YES YES NO VCR Section PACE VCR IN STOP MODE BLUE MISSING IN STOP MODE CHANGE IC601 SELECT LINE MODE WITHOUT INPUT SIGNAL IC601 72 H CHECK IC6P01 8 TO IC601 72 NO YES YES CHECK...

Page 180: ...IC501 NO CHECK C851 C852 L803 L804 TUNER YES YES YES YES IC501 78 80 AUDIO SIGNAL CHECK IC501 38 39 CLK DATA IC501 51 53 AUDIO SIGNAL INPUT IC801 1 3 AUDIO SIGNAL YES NO VCR Section CHECK IC801 NO MI...

Page 181: ...C301 10 AUDIO SIGNAL IC301 100 AUDIO FM SIGNAL IC301 5 MIX SIGNAL AUDIO 70KHz CN3A01 4 OSCILLATION NO CHECK AUDIO MISSING IN PB MODE CHECK PB MODE CHECK A CE HEAD MONO NO CHECK AUDIO MISSING IN EE MOD...

Page 182: ...CN604 1 NO NO NO YES YES YES VCR Section CAPSTAN DOES NOT ROTATE PLACE THE VCR IN PLAY MODE CN604 2 15V CN604 3 AL 5V CN604 9 3 2V CN604 5 2 6V CN601 3 OUTPUT PWM IC601 10 OUTPUT PWM CHECK CAPSTAN MOT...

Page 183: ...ics DRUM DOES NOT ROTATE CN604 6 12V CN604 3 5V CN604 12 2 5V CHECK CYLINDER MOTOR IC601 5 9 DRUM CTL L CHECK PC5V LINE CHECK AL12V 12V AT LINE IN THE POWER BLOCK NO NO NO YES YES YES CHANGE IC601 NO...

Page 184: ...utput are normal Check open state from SIC3 to pick up Check RIC1 and A B C D input Check SIC3 Yes Yes No No A DVD Section No pick up home positing SIC1 34 SLD output is normal 1 7V 1 8V Check the Sle...

Page 185: ...ference into 10ohm DVD Section No Search Operation MIRR SIC1 37 output is normal Actual velocity occurs at SIC1 15 terminal Actual velocity occurs at SIC3 32 33 terminal Check RIC1 peripheral circuit...

Page 186: ...Check DCN1 and pick up Check MECHA Check RIC1 31 terminal Check SIC3 peripheral circuit Yes Yes Yes Yes Yes Yes Yes No No No No No No No TRD Waveform DVD Section Abnormal rotation of disc motor Input...

Page 187: ...nector Yes Yes No No OPEN Waveform DVD Section CD VCD DVD L R output error Mixed Audio output Normal DATA 0 is input in AIC4 2 CHECK AIC4 7 8pin output is normal Check PCB peripheral Pattern shot Chec...

Page 188: ...s normal Check the connection between VIC1 and S JACK Yes No Yes Check the connection of s video cable DVD Section Y Pr Pb output error Did the screen select with the component VIC1 18 21 24pin output...

Page 189: ...5 in VIC1 is in high stste Yes Check the connection netween pin 133 in ZIC1 and VIC1 Check the connection betwen VIC1 1 and PDS52 Check the connection between PDS52 and pin 1 in VIC1 Check the solder...

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