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5-2

Disassembly and Reassembly

Samsung Electronics

5-1-5 Chassis Removal

VCR MAIN PCB

S.M.P.S PCB

DVD DECK

VCR DECK

DVD MAIN PCB

REMOVE 2 SCREWS

REMOVE 4 SCREWS

REMOVE 3 SCREWS

REMOVE 2 SCREWS

REMOVE

3 SCREWS

Fig. 5-5 Chassis Removal

5-1-6 VCR Main PCB Removal

REMOVE 4 SCREWS

VCR MAIN PCB

MODE SWITCH

When installing the ass'y full deck on the Main PCB,

be sure to align the assembly point of mode switch.

ASSEMBLY POINT

Fig. 5-6 VCR Main PCB Removal

Содержание DVD-V642K

Страница 1: ...ting Description 8 VCR Deck Operating Description 9 Troubleshooting 10 Block Diagram 11 Wiring Diagram 12 Schematic Diagrams Manual DVD VCR COMBINATION CONTENTS TRAINING MANUAL DVD V940K V645K V642K V29000K V25000K SV DVD240 ELECTRONICS Samsung Electronics Co Ltd APR 2004 Printed in Korea AK82 00557A This Service Manual is a property of Samsung Electronics Co Ltd Any unauthorized use of Manual can...

Страница 2: ... Motor Load Ass y Separate the Motor Load Ass y 2 When Slider S T approachs the unloading position rotate holder Clutch counterclockwise after inserting screwdriver in the frame s bottom hole in order to wind the unwound tape Refer to Fig 3 If you rotate Gear Worm Œ continuously when tape is unwinding you may cause tape contamination by grease and tape damage Be sure to wind the unwound tape with ...

Страница 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 metal parts of the instrument antennas handle brackets metal cabinets screw heads metallic overlays control shafts etc espe cially any exposed metal parts that offer an electri cal return path to the ...

Страница 4: ...nched 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 overheated or that are otherwise damaged should be replaced with components parts and or wiring that meet original specifications Additionally determine the cause of overheating and or damage and if neces...

Страница 5: ...d 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 components used in the unit have a specified flame resistance and dielectric strength When replacing components use components which have the same ratings Components identi fied by shading by or by in th...

Страница 6: ...posure 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 static can generate electrical charges suffi cient to damage ESD devices 5 Do not use freon propelled chemicals These can generate electrical charges sufficient to damage ESD devices 6 Do not remove a ...

Страница 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 touch the unit Be sure to put on a wrist strap grounded to the sheet Be sure to lay a conductive sheet made of copper etc Which is grounded to the table Fig 1 3 6 Short the short terminal on the PCB wh...

Страница 8: ... Assy 3 Make solder land 2 points short on Pick up See Fig 1 4 4 Disassemble 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 UP ASS Y SOLDER LAND 2 POINTS SHORT Note If the assembly and disassembly are not done in correct sequence the Pick up may be damaged Fig 1 4 ...

Страница 9: ...Layer 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 consists of two 0 6mm discs attached together enabling access to the upper and lower side of the disk and 4 sides could be used at maximum Single Layer 4 7GByte Polycarbonate Label Bondinglayer Reflectivel...

Страница 10: ...nd 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 multi channel Audio DVD R 1 Time Recording Storage media for the computer DVD RAM Rewritable Data access storage media for the computer ...

Страница 11: ...ich 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 DVD Title that contains the appropriate contents to function properly 2 2 2 Audio Video Specifications Classification DVD Video Video CD LD Compression MPEG 2 MPEG 1 Analog Pixel 720 x 480 352 x 240 VI...

Страница 12: ...Feature 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 the Data loss to Provide a clear natural screen while increasing the storage time DVD Video Feature 2 Application of the MPEG 2 compression technology MPEG 2 Variable compression Max 1 40 Field unit ...

Страница 13: ...conventional 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 quality Digital sound without the audio data compression Various Digital Recordings are possible as shown in the table to the right DVD Video Feature 3 High quality surround audio Sampling Frequency Bit R...

Страница 14: ...lities 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 the viewer to select a specific viewpoint at a given time Especially for the Music Video and Sports Title this provides a more lively image of the scene DVD Video Feature 6 Multi Angle Note Only enab...

Страница 15: ... 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 but the Hardware developers must adopt the appropriate regionnal code for sale Region 1 The United States and its territories Canada Region 2 Europe Japan Greenland Egypt South Africa the Middle East Region ...

Страница 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 Authoring Process Video Audio Master Surround Audio Master Subtitle Master MPEG 2 Encoding AC 3 MPEG Audio Encoding Cutting Master Disc Production Subtitle Encoding Authoring Process Video Audio Subtitle M...

Страница 17: ...47Kohm unbalnced RF out UHF 28 69 lnitial CH36 Audio DVD VCR RCA jack Output Audio DVD only Digital audio out OPTICAL COAXIAL RCA jack Video DVD VCR RCA jack Video DVD only S Video out COMPONENT out RCA jack Tape format VHS type video tape S VHS type video tape Playback only Color system PAL NTSC4 43 MESECAM NTSC playback on PAL TV VCR Video S N Above 43dB standard recording Resolution Above 240 l...

Страница 18: ...n the direction of arrow Fig 5 1 Cabinet Top Removal 5 1 2 Ass y Bottom Cover Removal Œ RELEASE 2 HOOKS Bottom View 5 1 4 Function PCB Removal Œ RELEASE 1 HOOK Fig 5 4 Function PCB Removal Fig 5 2 Ass y Bottom Cover Removal RELEASE 3 HOOKS Bottom View Œ RELEASE 4 HOOKS Top View Fig 5 3 Ass y Front Panel Removal 5 1 3 Ass y Front Panel Removal ...

Страница 19: ...B Œ REMOVE 2 SCREWS REMOVE 4 SCREWS ˇ REMOVE 3 SCREWS REMOVE 2 SCREWS ˆ REMOVE 3 SCREWS Fig 5 5 Chassis Removal 5 1 6 VCR Main PCB Removal Œ REMOVE 4 SCREWS VCR MAIN PCB MODE SWITCH When installing the ass y full deck on the Main PCB be sure to align the assembly point of mode switch ASSEMBLY POINT Fig 5 6 VCR Main PCB Removal ...

Страница 20: ...Disassembly and Reassembly 5 3 Samsung Electronics 5 2 Circuit Board Locations DVD MAIN PCB FUNCTION PCB VCR MAIN PCB S M P S PCB Fig 5 7 Circuit Board Locations ...

Страница 21: ...assembly Samsung Electronics 5 3 VCR Deck Parts Locations 5 3 1 Top View Œ ˆ Ø ˇ Fig 5 8 Top parts Location 1 Œ GEAR FL CAM MOTOR LOADING ASS Y ˇ LEVER FL ARM ASS Y HOLDER FL CASSETTE ASS Y ˆ LEVER FL DOOR Ø SLIDER FL DRIVE ...

Страница 22: ... Ø Ô Ò ˇ ˆ Fig 5 9 Top Parts Location 2 Œ FE HEAD CYLINDER ASS Y ˇ ACE HEAD ASS Y LEVER UNIT PINCH ASS Y ˆ LEVER 9 GUIDE ASS Y Ø LEVER TENSION ASS Y BAND BRAKE ASS Y DISK S REEL LEVER S BRAKE ASS Y GEAR IDLE Ô LEVER IDLE LEVER T BRAKE ASS Y Ò DISK T REEL ...

Страница 23: ...ng Electronics 5 3 2 Bottom View Œ ˇ ˆ Ø Fig 5 10 Bottom Parts Location Œ GEAR JOINT 1 GEAR JOINT 2 ˇ BRAKET GEAR MOTOR CAPSTAN ASS Y ˆ LEVER T LOAD ASS Y Ø GEAR LOADING DRIVE LEVER S LOAD ASS Y HOLDER CLUTCH ASS Y BELT PULLEY SLIDER CAM ...

Страница 24: ...y Œ in this time you have to grasp the Lever FL Cassette R Continuously until the Holder FL Cassette Ass y Œ is taken out completely Note Be sure to insert Lever FL Cassette R in the direction of A to prevent separation and breakage of the Lever FL Cassette R at disassembling and reassembling RAIL B BOSS A LEVER FL CASSETTEE R A Œ HOLDER FL CASSETTEE ASS Y Fig 5 11 Holder FL Cassette Ass y Removal...

Страница 25: ... Remove the Gear FL cam Note When reinstalling be sure to reassemble Slider FL drive Œ after you insert the Boss of Lever FL ARM R in Groove of Slider Fl drive Œ Assembly Align the Gear FL Cam Œ with the Gear worm wheel Post as shown drawing Refer to Timing point Œ SLIDER FL DRIVE GEAR FL CAM Fig 5 14 Slider FL Drive Removal 5 4 3 Lever FL Door Removal 1 Release the Hook and Remove the Lever FL Do...

Страница 26: ...Gear Worm Wheel Removal 1 Remove the Gear Worm wheel Œ Œ 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 Œ from Connector Waffer CONNECTOR WAFER Œ CABLE FLAT Fig 5 17 Cable Flat Removal ...

Страница 27: ... 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 ˇ Œ SCREW BRAKET GEAR GEAR JOINT 1 ˇ GEAR JOINT 2 Fig 5 19 Bracket Gear Gear Joint 1 2 Removal Œ GEAR JOINT1 GEAR JOINT2 ˇ SLIDER CAM TIMING POINT 1 TIMING POINT 2 Fig 5 20 Gear Joint 1 2 Assembly 5 4 7 Motor Loading Ass y Removal 1 Remove the screw Œ 2 Remove the Motor Loading As...

Страница 28: ...m ˇ as shown in drawing Refer to Timing Point 3 LEVER LOAD S Œ LEVER LOAD T PIN A PIN C PIN B PIN D ˇ SLIDER CAM TIMING POINT 2 TIMING POINT 1 TIMING POINT 3 Fig 5 22 Gear Loading Drive Slider Cam Lever Load S T Ass y Assembly 5 4 9 Gear Loading Drive Slider Cam Lever Load S T Ass y Removal 1 Remove the Belt Pulley Refer to Fig 5 38 2 Remove the Gear Loading Drive Œ after releasing Hook A in the d...

Страница 29: ...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 to the Mark B Œ SPRING TENTION LEVER LEVER TENTION ASS Y ˇ BAND BRAKE ASS Y STOPPER MARK B A Fig 5 24 Lever Tension Ass y Band Brake Ass y Removal 5 4 11 Lever Pinch Drive Lever Tension Drive Removal 1 ...

Страница 30: ...LE GEAR IDLE A HOOK C 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 Brake Ass y Œ with spring brake ˇ Assembly 1 Assembly the Lever S Brake Ass y Œ on the Main Base 2 Assembly the Lever T Brake Ass y with spring brake ˇ Note Take extreme care not to be folded and transf...

Страница 31: ...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 y as shown in detail B Œ DISK S REEL DISK T REEL Œ WASHER SLIT HOLDER CLUTCH ASS Y DETAIL A BAD SPRING GOOD BAD SPRING GOOD DETAIL B Fig 5 27 Disk S T Reel Removal Fig 5 28 Holder Clutch Ass y Removal...

Страница 32: ...an gular holes on Main Base as shown in Fig 5 30 2 Lift the Lever Up Down Ass y Œ 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 Œ 4 Insert the Gear Center Ass y in the post on Main Base 5 Push down the Lever Up Down Ass y Œ for locking of the Hook Note 1 Take care not to separate and sentence does not mark sense 2 Be sure to confirm that ...

Страница 33: ... to apply grease on the post pinch roller ˇ SPRING PINCH DRIVE Œ 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 Removal 1 Remove the Spring 9 Guide Œ 2 Lift the Spring 9 Guide Ass y in the direction of arrow A Note 1 Take extreme care not to get grease on the tape Guide Post 2 After reinstalling check the bottom ...

Страница 34: ...CE Head Removal 1 Pull out the FPC from connector of ACE Head Ass y 2 Remove the screw Œ 3 Lift the ACE Head Ass y Œ SCREW HEAD ACE ASS Y Fig 5 35 ACE Head Removal 5 4 21 FE Head Removal 1 Remove the screw Œ 2 Lift the FE Head Œ FE HEAD Fig 5 34 FE Head Removal ...

Страница 35: ... 3 Lift the Cylinder Ass y ˇ Assembly 1 Match the 3 holes in the bottom of Cylinder ass y ˇ to the 3 holes of Main Base as attending not to drop or knock the Cylinder ass y ˇ 2 Tighten the 1 Screw Œ 3 Match the Plate Ground Deck to the Hole of Base Main 4 Tighten the other 2 Screws Œ Note 1 Take care not to touch the Cylinder Ass y ˇ and the tape guide post at reinstalling 2 When reinstalling Don ...

Страница 36: ...Base There should have no gap between the head of screws and the top side of Main Base After reinstalling adjusting the tape transport system again Œ 3 SCREWS A B C MOTOR CAPSTAN ASS Y Fig 5 40 Motor Capstan Ass y Removal 5 4 25 Belt Pulley Removal 1 Remove the Belt Pulley Œ Note Take extreme care not to get grease on Belt Pulley Œ at assembling or reassembling Œ BELT PULLEY Fig 5 38 Belt Pulley R...

Страница 37: ...g 5 43 If you rotate Gear Worm Œ 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 in the state of set horizently 3 Rotate Gear Worm Œ clockwise using screw driver again up to the state of eject mode and then pick out the tape Refer to Fig 5 42 FRAME 5 4 28 Post 8 Guide Ass y Removal 1 Rotate the Post 8 Gu...

Страница 38: ... 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 POST REEL S T SLEEVE TENSION POST CENTER LEVER IDLE BOSS 2Point CAPSTAN MOTOR PULLEY O O O O O BELT PULLEY O O O O O O O HOLDER CLUTCH ASS Y O O O O O O O O O GEAR CENTER ASS Y O O O O O O O O O GEAR I...

Страница 39: ...y and Reassembly Samsung Electronics 5 6 DVD Deck 5 6 1 Holder Chuck Removal 1 Push 4 Hooks Œ in the direction of arrow A and lift up the Holder Chuck Fig 5 45 Holder Chuck Removal HOLDER CHUCK Œ 2 HOOKS Œ 2 HOOKS A A ...

Страница 40: ...val 1 Insert a Screw Driver Œ into Emergency Hole and push the Slider Housing ˇ in the direction arrow A 2 When the Tray Disc comes out a little pull it in the direction arrow B by hand Fig 5 46 Tray Disc Removal B ˇ SLIDER HOUSING TRAY DISC A Œ SCREW DRIVER EMERGENCY HOLE ...

Страница 41: ...1 Screw and lift up the Ass y P U Deck ˇ in the direction arrow A 3 When the Ass y P U Deck ˇ lift up a little push Chassis Sub in the direction of arrow B and lift up the Ass y P U Deck ˇ Fig 5 47 Assy P U Deck Removal SL BLK SP BLK TM BLK TM BLK SL RED SP RED A B B 1 SCREW ˇ ASS Y P U DECK CHASSIS SUB Œ 4 SOLDERING Assembly Point ...

Страница 42: ...the direction arrow B 4 Push the 1 Hook ˆ in the direction of arrow C and lift up the Slider Housing 5 Remove the Belt Pulley Ø and 2 Screws Ass y Motor Load 6 Push the 1 Hook in the direction of arrow D and lift up the Gear Pulley Gear Tray Ô Fig 5 48 Ass y Housing Removal B D A A C SLIDER HOUSING ˇ ASS Y PCB DECK Œ 2 SOLDERING 2 SCREWS Ø BELT PULLEY Ô GEAR TRAY GEAR PULLEY 1 HOOK ˆ 1 HOOK ASS Y ...

Страница 43: ...Gear Feed A ˆ 3 Remove the 2 Screws Ø and lift down Motor Feed Ass y 4 Remove the 2 Screws and lift down Motor Spindl Ass y 5 Remove the 3 Screws and remove 3 Holder Cam Skew Ô Shaft Pick Up Ass y Pick Up Ò Fig 5 49 Ass y Bracket Deck Removal A ˇ HOOK GEAR FEED B ˆ GEAR FEED A Ø 2 SCREWS MOTOR FEED ASS Y Œ 2 SCREWS 2 SCREWS MOTOR SPINDLE CHASSIS SUB Ô 3 HOLDER CAM SKEW 3 SCREWS SHAFT PICK UP Ò ASS...

Страница 44: ...acing the cylinder ass y be sure to adjust the X Point and Head switching adjustment 4 How to adjust Short the TEST Point on VCR MAIN PCB to set the adjustment mode If the corresponding adjustment button is pressed the adjustment is performed automatically When the adjustment is completed be sure to turn the power off 6 1 1 a Location of adjustment button of remote control Fig 6 1 X Point Tracking...

Страница 45: ...6 2 Alignment and Adjustments Samsung Electronics 6 1 1 b TEST location for adjustment mode setting Fig 6 2 VCR Main PCB Top View SHORT ...

Страница 46: ...ol 4 After selecting the option number is completed press the button of remote control If button is pressed the selected number is changescolor See Fig 6 4 5 Press the ENTER button of remote control again to store the option number 6 Turn the Power off 1 NVRAM Option is adjusted in the factory 2 In case Main PCB Micom IC601 and NVRAM IC603 EEPROM are replaced be sure to set the corresponding optio...

Страница 47: ...2 17 18 19 20 22 30 34 36 37 38 42 44 47 48 50 51 57 61 63 65 66 DVD V940K XTL 6 7 8 9 10 12 17 18 19 20 22 30 34 36 37 39 42 44 47 48 50 51 57 61 63 65 66 DVD V29000K 6 7 8 9 10 12 17 18 19 20 22 29 30 34 36 38 42 44 47 48 50 51 56 57 61 63 65 66 DVD V25000K 6 9 10 12 17 18 19 20 22 29 30 34 36 38 42 44 47 48 52 56 57 61 63 65 66 DVD V940K XSG ELT 6 7 8 9 10 12 17 18 19 20 22 30 34 36 38 42 44 47...

Страница 48: ...Alignment and Adjustments 6 5 Samsung Electronics 6 2 DVD Adjustment 6 2 1 Location of Test Point Fig 6 5 Location of test Point Main PCB Top Side Pin 29 of RIC1 ...

Страница 49: ...nd Test Point 6 2 2 Skew Adjustment Test Disc Adjustment Spec Test Point Adjustment Location TDV 533 Pin 29 of RIC1 Ass y Deck Top Side Chapter 14 Flat Waveform DVD Main PCB Top Side See Fig 6 6 See Fig 6 5 Fig 6 6 Ass y Deck Top Side Test Disc Service not Available Table 6 2 ...

Страница 50: ...et the Oscilloscope 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 Chapter 1 and make sure the Waveform is Flat here as well If not you have to go back to Chapter 14 and adjust again If you cannot obtain a Flat waveform then the unit is defective Note The Deck ...

Страница 51: ...eference for the transport adjustment To maintain the 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 DISK 8 GUIDE POST 9 GUIDE POST SUPPLY REEL DISK CAPSTAN PINCH ROLLER GUIDE ROLLER T GUIDE ROLLER S FULL ERASE HEAD 3 GUIDE POST TENSION POST HEIGHT SCRE...

Страница 52: ...e 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 Observe surface of the audio head using a dental mirror 3 Turn screw C clockwise or counterclockwise until the gap of lower tape edge and the lower edge of the control head is about 0 25mm Refer to Fi...

Страница 53: ...wer 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 Check c AUDIO AZIMUTH ADJUSTMENT 1 Load alignment tape Mono scope and playback the 7KHz signal 2 Connect channel 1 scope probe to audio output 3 Adjust screw B to achieve maximum audio level See Fig...

Страница 54: ...s then adjustment is operates automatically See Fig 6 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 adjustment hole and adjust it so that envelope waveform is maximum Test point W325 Audio Output W324 Envelope W323 H D S W Trigger W322 Control Pulse Fig 6 13 Location of Test point VCR Main PCB Top View AUD...

Страница 55: ... follows Note a Maximum output of the video RF envelope 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 section A in Fig 6 15 does not meet the specification adjust the guide roller S up or down 5 If the section B in Fig 6 15 does not meet the specificati...

Страница 56: ...ope 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 S T Height Adjustment IDEAL ENVELOPE SHEIGHTTOOHIGH SHEIGHTTOOLOW THEIGHTTOOHIGH THEIGHTTOOLOW GUIDE ROLLER S GUIDE ROLLER T ...

Страница 57: ...E Fig 6 17 Video Envelope Rising when Operation mode 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 self recorded tape recording made on the unit using with T 120 E 120 The video envelope should meet the specification as shown in Fig 6 18 In SP mod...

Страница 58: ... 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 Center Ass y Note If the spec does not meet the followings specifications replace the holder clutch ass y and then recheck MODE TORQUE g cm GAUGE PB 42 11 Cassette Torquemeter RPS 145 30 Cassette Torque...

Страница 59: ...Ns 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 transformer is determined by the ratio of 1st Np and 2nd Ns Vs Ns Np x Vp Vout is output DC by diode and condensor 7 Circuit Operating Descriptions ...

Страница 60: ...sed 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 power Regulator loss Fig 7 5 Terms 1 1st Common power input to 1st winding 2 2nd Circuit followings output winding of transformer 3 f Frequency Switching frequency T Switching cycle 4 Duty Ton T x 100...

Страница 61: ...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 circuit protects SCS11A from damage through leakage voltage suppression by RC Charges the leakage voltage to D1SS11 and C1SD12 and discharges to R1SD11 and R1SD13 3 C1SS16 For noise removal c IC1SS2 Vcc ...

Страница 62: ...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 up Maintain Vout 5 8V 3 If load of 5 8 V terminal decreases or AC input voltage rises and Vout rises above 5 8V then Reverse sequence of the above description Duty down Vout down Maintain 5 8V i e th...

Страница 63: ...g 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 U T Fig 7 9 b IC1SF01 ICE2B0565 Internal Block Diagram VCC Power Manag em ent Protecti on Unit Soft Start Co ntrol PW M Co ntrolle r Cu rren t Mo de FB Drain Co olMO S PWM Controller Low Power StandB...

Страница 64: ...o 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 control is performed by 4 control sections System and timer control Servo control F S Tuner On Screen Display LED DISPLAY REMOCON SYSCON MECHA BLOCK Hi Fi IC EPROM IC TM BLOCK AV BLOCK OSD BLOCK IIC COMM...

Страница 65: ...Circuit Operating Descriptions 7 7 Fig 7 12 Block Diagram ...

Страница 66: ...Control 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 Controls a series of loading unloading operation after the u COM judges the operation mode and sets the mechanism to suitable mode Fig 7 13 show correlation between u COM and peripheral components d...

Страница 67: ...otor 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 Unload POWER OFF LOADING START 0 0 0 1 Tape loading start point LOADING END 1 0 1 1 1 Tape loading end point REV 1 1 0 X Reverse picture search reverse SLOW PLAY 0 1 0 X Play Rec F PS Still SLOW F ADV...

Страница 68: ...p 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 forward search reverse search still slow and frame advance Audio signal is muted V lock is controlled by pin 31 of IC601 9 Forward Search Mode 5 Times play speed search in SP State input Press the fa...

Страница 69: ...unter 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 State input Press the record button during stop mode and record pause mode or at the preset time reached in the timer record mode Press the REC button in stop mode Indication output R lights in LED d...

Страница 70: ...rch 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 recording starts the duty cycle of control pulse will change and then record on the control track of the tape for 2 seconds Fig 7 14 Index Recording REC CTL PB CTL NORMAL RECORD INDEX RECORD 100 100 60 5 2...

Страница 71: ... power on state in the reel emergency Fig 7 15 Reel and Cylinder Lock T END S END Sensor R676 66 75 98 99 R679 R678 R691 R682 R675 C633 21 Cylinder Lock Sensor Cylinder lock sensor detects abnormal rotation of the cylinder motor Cylinder FG pulse is supplied to pin97 of IC601 MICOM measures the period of the pulse in the play record search and trick play models When H d S W frequency is less than ...

Страница 72: ...tape 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 display Counter displays the time and it is increased or decreased by one minute after counting 1500 control puls es Counter mode is switched to clock mode when the display button is pushed or when the ...

Страница 73: ... 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 programs Express recording lets the operator record up to 9 hours without programming the timer 25 Clock Display The clock generator inside of the u COM counts the oscillation signal of XT601 for the time...

Страница 74: ...eed 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 speed of the capstan motor so that the video head can trace the video track correctly It keeps tape speed constant according to the mode SP LP during playback and recording Table 7 3 Servo System Signa...

Страница 75: ...PBCTL 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 PWM conversion Motor driver Motor driver Carrier rejection filter Carrier rejection filter M Drum motor M Capstan motor CFG signal DPG signal DFG signal Remark The broken line indicates the internal...

Страница 76: ...vided 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 CFG signal which is divided from the CFG signal in the CFG frequency divider to a frequency of 25Hz In playback the latch signal is the divided CFG signal obtained by frequency division from the risi...

Страница 77: ...e 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 which contains video head phase information with a reference signal In the actual circuit the comparison is carried out by comparing the head switching HSW signal which is delayed by a counter that is r...

Страница 78: ...till 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 search mode both CH 1 2 and V LOCK position are fixed to 6 5H CH2 CH1 HEAD SW EDGE V LOCK PULSE PEDESTAL LEVEL 1 2 H Fig 7 20 V LOCK PULSE ...

Страница 79: ...at 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 video amp and driver The output signal from the clamp circuit enter the detail enhancer circuit In the detail enhancer circuit the low level high frequency video signal is emphasized to improve the original signals freque...

Страница 80: ...or 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 governed by the level of the processed video signal at any given point Therefore the processed video signal varies the frequency of the sine wave which is frequency modulation FM During playback in SLP m...

Страница 81: ...nal 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 detector output signal is applied to the FM AGC Amp to keep the output constant This output is applied to the PB FM EQ block FM EQ is correct the phase distortion and level The signal through PB EQ ci...

Страница 82: ...returns 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 characteristics are also the opposite of those in recording 7 Drop Out Compensator YNR Circuit This circuit compensated for missing parts of the FM signal due to dust dirt on the tape or irregular tape coati...

Страница 83: ...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 chroma signal is supplied to the luma chroma mixer of pre amp block and then recorded on the tape via the record amp and heads AFC detection is performed with the head switching pulse and the fh signal generated from...

Страница 84: ...tself 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 phase is shifted by 90 it becomes 627KHz 90 The 40fh 90 627KHz 90 is balanced modu lated via fsc 4 43MHz depending on which side band is detected That is the fs 40fh 90 4 2MHz 90 of total frequency is s...

Страница 85: ...signal 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 main converter are the 627KHz signal which comes from the output of the ACC and a 5 06MHz which has the same rotational phase as the 627KHz signal It is important that the rotational phase of the 5 0...

Страница 86: ...circuit 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 SEL CONV LINEAMP 80 LINE OUT LINEAR IN LINEAR OUT 4 6 PRE AMP INPUT BPF DEMOD LPF PNR CONV LINEAMP 80 LINEAR IN OUT SEL 4 LINE OUT Fig 7 25 REC Mode L CH Only Fig 7 26 PB Mode L CH Only 2 PB Mode L C...

Страница 87: ...signals 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 eliminate the harmonic components of Hi Fi carrier formed during VCO which may affect other block It s pass band approximately 2MHz 9 MIXER It mixes the Hi Fi carrier formed in L CH and R CH However due to...

Страница 88: ...ed 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 compensating the switching noise when the damage on the envelope ranges 10 15mVpp 17 ENV DET To obtain optimal tracking envelop must be peak to peak and micom should be in DC It is a function to conve...

Страница 89: ...d 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 the level of distortion repodly increases 3 LINE AMP Line amp s gain is approximately 23dB The purpose of the line amp is to amplify to 68dB in order to obtain the recorded signal on the tape during p...

Страница 90: ...be 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 is approximately 40Vp p it operates on recoed mode It is supplied to audio erase head and full erase head used to erase already recorded signals Also it conducts AM Amplitude Modulation using oscill...

Страница 91: ...channel 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 TUNER BLOCK AND IF DEMODULATOR BLOCK Its size is greatly reduced and other noise interference can be minimized to make performance high Fig 7 30 Tuner demodulator Block Diagram 11 3 5 12 21 23 24 ANT ...

Страница 92: ...and 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 Block Diagram ANTENNA TO TUNER SECTION HIGH CH OSC LOW CH OSC CH S W ANT S W VIDEO OUT TO TV AUDIO IN 2 ANT S W DRIVER VIDEO MOD FM MOD AUDIO CARRIER MOD WHITE CLIP VIDEO IN 6 ...

Страница 93: ...ve 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 rejection characteristic it shows especially various beat characteristic It serects channels and contains charge pump band driver The minimum step standard frequency 27 97KHZ AGC from IF Section Prescaler ...

Страница 94: ... 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 in the tuner so that it retains a constant level It is a quadrature detection type The carrier which is detected from video det is directly input to AFT detector The 90 degree delayed phase signal i...

Страница 95: ...e 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 flattened using SAP LPF and the SAP signal is input to the dbx TV block 4 dbx TV BLOCK Either the L R signal and SAP signal input is selected by the mode control and input to the dbx TV block The inp...

Страница 96: ...g 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 Base Band Spectrum ...

Страница 97: ... analizes the key commands of front panel or instruc tions of remote control through communication with Micom IC601 MPD790006GF of VCR an d controls the devices on board to execute the corresponding commands after initializing the devices connected with micom on board at power on 2 Block Diagram RIC1 ES6603 AIC2 PCM1742KE IC601 MPD790006GF DIC4 TC74VHCT125 U1 Vibratto II DIC5 IS42S16400A 7T IC605 ...

Страница 98: ...B C D CD DVD CD R b4 CCR b5 I NPU T SEL I NPU T I M P SEL RF C R b2 0 TRC R2 b6 4 DP D EQ TRC R b6 DP D CO M P HYS O N PD C R b3 TRC R2 b7 PD C R b3 CTC R b3 0 CO gai n CB R b1 0 RF C R b3 CA R b3 2 SI G DET RF C R b5 4 FCC R b6 0 FBCR b6 0 CA R b1 0 Env Cl amp CD R b5 1 6dB i s added hig h gain m ode CD R b5 1 12dB i s added hig h gain m ode C ONTROL Sign al s To each bl oc k CD R b3 VC 2 Offs et...

Страница 99: ...low the disc track in use of tracking error signal created 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 SERVO DISC Motor Control SERVO Controls the disc motor to maintain a constant linear velocity necessary for RF signal 2 Block Diagram Fig 7 37 TRINO ...

Страница 100: ...g a constant distance from the disc these operations are same in CD and DVD Fig 7 38 b Play When focus loop closes the loop during focus servo on both pin 142 and pin of U1 are controlled by VREF voltage approx 1 5V and pin 40 of RIC1 are approximately 1 5V 2 TRACKING SERVO A NORMAL PLAY MODE Œ For DVD Composite The signal output from PD A B C D of Pick up the tracking error signal pin31 of RIC1 u...

Страница 101: ...LED LINKED SERVO Normal play mode Move SLED motor slightly by means of DA signal in U1 pin 174 as the tracking actuator moves along with track during play Control to move the entire Pick up as the tracking actuator moves Coarse serach mode In case of long distance search such as chapter serach U1 uses MIRR and signal of U146 Then read ID and compute the existing track count after input of next tra...

Страница 102: ... system micomunicate with RIC1 and MIC1 by seqnence RIC1 set the servo and moving SLED focclsing actuator to check the disc now the DVD system is ready to opente 2 Block Diagram Fig 7 39 U1 Vibratto DIC2 MBM29LV800BA Flas3 DIC5 MIC1 FAN8004 RIC1 ES6603S open close tracking SLEDing Focclsing spindle DRVSB RFO RFF P LNN SDARM RF SCLK TE FE DEFECTMIRR SCLK RRQ SRQ M RST RXD TXD IC601 MPP790006GF Data...

Страница 103: ...ng of 8bit video signal of ITU R601 format The separate signal is encoded to NTSC PAL by control of IC601 The above signals which are CVBS Composite Video Burst Synchronized G GREEN Y PIN139 Y S_VIDEO B BRUE Pb PIN145 and C S_VIDEO R RED Pr PIN151 are selectively outputted CVBS S_VIDEO RGB Component by the rear switch In Course of encoding 8bit data can extend to 10bit or more To convert the exten...

Страница 104: ...ia 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 you want to listen to the multichannel output you have to connect digital output with AC 3 amp or MPEG DTS amp 2 Block Diagram AIC2 PCM1742KE D A CONVERTER POST FILTER POST FILTER AMP AMP ZIC1 Vibratto II ...

Страница 105: ...ompressed 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 process they is transmitted to digital amplifier or AC 3 MPEG DTS amplifier built in the external digital input source with IEC 958 1937 transmission format AUDIO INPUT BUFFER AUDIO OUTPUT BUFFER RECEIVER or DECOD...

Страница 106: ... 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 in VCR 1 The cassette is automatically set on the reel disc 2 The tape is pulled out from the cassette and wrapped around the cylinder 3 The cylinder turns in a constant speed rate synchronizing wit...

Страница 107: ...d 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 side tape exit side of the cylinder The guide parts marked with asterisks are equipped with the adjusting mechanism to stabilize the tape run ning or to record and reproduce the signals precisely Fig 8 ...

Страница 108: ... 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 enters a direct connecting status in which the clutch mechanism does not operate and the capstan drive torque is transmitted without reduction so a high speed taking up is enabled Fig 8 4 Reel Drive Syst...

Страница 109: ...deo 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 cassette tape is loaded 8 The status becomes full loading 9 When the cassette is out the reverse steps of the above procedure are carried out Fig 8 5 Cassette IN Start Sensor OFF Microcomputer Microcompu...

Страница 110: ...case 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 head Tape guide Pinch roller No 9 guide No 8 guide Capstan T Tape up reel disc Capstan belt Clutch gear Clutch mechanism Idle gear S slant guide S guide roller FE head Tension post Tape guide S Supply...

Страница 111: ...condition 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 Standby Mode In the full loading system the tape loading starts at the same time when the cassette mounting has completed the mechanism shifts to the playback position and enters the standby status ...

Страница 112: ... 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 Mode Cylinder T slant guide T guide roller Video tape Magneticside ACE head Tape guide Pinch roller No 9 guide No 8 guide Capstan T Tape up reel disc Capstan belt Clutch gear Clutch mechanism Idle g...

Страница 113: ... 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 the clutch mechanism Fig 8 10 Record Playback Mode Cylinder T slant guide T guide roller Video tape Magneticside ACE head Tape guide Pinch roller No 9 guide No 8 guide Capstan T Tape up reel disc Capst...

Страница 114: ... the 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 Supply Stsrt sensor Tape Mode sensor Detecting of mechanical mode position Detection of cassette in cassette out Loading motor control Voltage direction Capstan motor control Speed direction Abnorma...

Страница 115: ...ading 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 shows each mode and mechanism status in each mode concerned with the rotation of the FL cam gear or cam slider shift The mechanism operates as shown in Fig 8 13 according to the timing chart in Fig ...

Страница 116: ...lever 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 drive lever S brake T brake Pinch drive lever Joint gear 2 Cam slider Joint gear 1 FL cam gear Loading motor Bottom View Top View ...

Страница 117: ...VCR Deck Operating Description 8 12 Samsung Electronics Fig 8 14 Mecha Timing Chart ...

Страница 118: ...ng 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 Œ The tape load is large during performing FF The tape load is small during performing REW and reducing speed No load is given to S REEL DISK and the small load is given to T REEL DISK Cf According to acceleration deceleration and the location of tape tension control which is ca...

Страница 119: ...MAIN 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 UNLOADING Completion STOP 1 FF REW 2 The small load is given to T REEL DISC ...

Страница 120: ...Deck 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 REEL ...

Страница 121: ...or 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 transmitted to the microcomputer and the microcomputer stops the cam slider at a specified angle thus establishing each mode The IC601 controls Capstan Motor Drive IC for each mode to make the loading m...

Страница 122: ...ver 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 lever rotates and the FL Drive Slider slides thereby closing the start sensor 4 IC601 controls Capstan Motor Drive IC to rotate the loading motor in forward direction and move the cassette holder At the ...

Страница 123: ...es 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 2 The No 9 guide is loaded 3 The pinch roller is loaded up to front of the capstan 4 The head cleaner is actuated during loading operation 5 The S soft brake is actuated 4 When the cam slider passes th...

Страница 124: ...essed 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 and shifts the cam slider 1 The mechanism components move in the reverse direction against the loading operation 4 When the cam slider reaches the position II IC601 makes the capstan motor rotate in th...

Страница 125: ...e 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 shifted to the reel disc side That is the band brake is released from the ON status and the back tension is also released 4 The S T soft brakes are being applied Fig 8 25 Stop Mode Position V ...

Страница 126: ...capstan driving force is directly transmitted to the reel disc 5 Brakes for the reel discs are as follows Œ VI position FF REW 1 mode S Brake soft brake T Brake off VII position FF REW 2 mode S Brake off T Brake soft brake 3 IC601 makes the capstan motor rotate in the forward direction and the idle gear transmits the rotation to the S T reel discs to take up the tape 5 FF REW to STOP mode 1 When t...

Страница 127: ...he 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 post touches the tape the band braking force is applied and the tension servo mechanism works 4 The clutch holder assembly enters clutched condition 5 S T brakes are released 4 IC601 makes the capstan r...

Страница 128: ...5 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 search The cam slider is in the position IV playback mode the cylinder motor is rotating and the capstan motor is rotating in the forward direction 2 IC 601 controls the audio circuit to actuate the aud...

Страница 129: ...toped 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 shifts to the position III RPS mode When the cam slider reaches the position III RPS mode the loading motor stops The mechanism status is as follows 1 The No 9 guide is loaded 2 The tension post is s...

Страница 130: ...ontrols 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 PAUSE button is pressed in the REC mode the mechanism enters the REC pause mode 2 IC601 controls the audio circuit and the video circuit and releases the record enable mode and performs the rewinding fo...

Страница 131: ...ower 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 the soldering around the IC601 Change IC701 NO NO Key operatious such as STOP PLAY OPEN are normal Check the circuity around the swich check the condition of commmunication with Main Micom IC601 11 SCL...

Страница 132: ...ATE 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 Section LOAD A TAPE AND PRESS PLAY BUTTON TURN VCR POWER ON MECHANISM DOESN T OPERATE IN PLAY MODE TAPE LOADING OPERATION LOAD IC601 76 LOW CYLINDER ROTATION SW 25Hz IC601 24 CYL FG PG IC601 97 CHECK CY...

Страница 133: ... 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 IC601 62 SEE AUDIO MISSING IN RECORD MODE CHANGE SW602 CHECK IC601 CHANGE TAPE SEE PLAY MODE DOESN T OPERATE EJECT NO NO YES NO REC VIDEO SEE VIDEO MISSING IN RECORD MODE NO YES YES YES YES VCR Section ...

Страница 134: ...CAPSTAN 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 FORWARD SEARCH CHECK IC601 CHECK CAPSTAN MOTOR IS CAPSTAN SPEED CHANGED SEARCH OPERATION NOISE BAR LOCKING END ADJUST A CE HEAD CHANGE DECK CHANGE IC601 SEE PLAY DOESN T OPERATE NO NO NO YES NO CONTROL ...

Страница 135: ...HECK START SENSOR S602 IC601 CHECK DM B LINE CHANGE IC601 NO NO NO YES IC601 24 25 HIGH 5V IC601 24 25 HIGH 5V 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 TUNER MODE OPERATION VIDEO MISSING IN EE MODE IC301 61 VIDEO OUT NO YES CHECK C355 YES NO IC301 48 CHECK IC601 NO IC301 68 CLOCK 69 DATA VIDEO YES VCR Sectio...

Страница 136: ...O YES IC301 94 SP IC301 88 SLP CHECK 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 VIDEO HEAD CHECK Q301 C395 CHECK IC601 18 CHECK VIDEO OUT LINE SEE PAGE 6 6 VIDEO MISSING IN EE MODE NO YES YES NO YES YES VIDEO FM IC301 21 VIDEO IC301 78 IC301 65 IC601 55 NO H D SW IC301 70 NO YES YES NO NO CHE...

Страница 137: ...EC 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 33 2V COLOR ROTERY IC301 57 CHANGE IC301 CHECK IC301 27 34 XT301 CHECK IC601 15 SEE PAGE 9 7 VIDEO MISSING IN PLAY MODE NO NO NO NO YES YES YES YES VCR Section CHECK IC301 61 ...

Страница 138: ...GE IC501 NO CHECK L807 L808 R813 R814 TUNER YES YES YES YES IC501 78 80 AUDIO SIGNAL CHECK IC501 38 39 CLK DATA IC501 51 53 AUDIO SIGNAL INPUT ICK1 1 7 AUDIO SIGNAL YES NO VCR Section CHECK ICK1 NO MISSING AUDIO IC501 7 69 AUDIO SIGNAL IC501 26 AUDIO FM CHECK CYLINDER CHANGE IC501 CHECK L504 C512 R503 C513 CHANGE IC501 CHECK AUDIO MISSING IN EE MODE AUDIO MISSING IN REC MODE MONO HIFI MONO NO NO Y...

Страница 139: ...IC301 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 MODE PLACE THE VCR IN PB MODE CHANGE IC501 AUDIO MISSING IN PB MODE CHECK L3A01 R3A25 CHANG IC301 CHECK ACE HEAD C3A16 AND CHANGE IC301 AUDIO SELECT IC501 78 80 AUDIO FM MIXED CHECK IC501 40 A H D SW CH...

Страница 140: ... 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 12 OUTPUT PWM CHECK CAPSTAN MOTOR CHECK R660 CHECK R609 CHANGE IC601 CHECK IC601 CHECK B IN THE POWER BLOCK CHECK PC5V 5V AT LINE IN THE POWER BLOCK NO NO NO NO YES NO YES NO YES YES YES YES VCR Section ...

Страница 141: ...ES YES YES CHANGE IC601 NO CHECK R608 C659 R617 C661 VCR Section MIC INSERT AND SINGING MIC SOUND MISSING CHECK RK04 RK07 R813 R814 JC801 IC7K1 1 7 SOUND CHECK MIC1 MIC2 IC7K1 PERIPHERAL CIRCUIT CHECK Q7K01 Q7K02 PERIPHERAL CIRCUIT CHECK ICK5 12 10 PERIPHERAL CIRCUIT CHECK ICK1 PERIPHERAL CIRCUIT NO YES YES YES YES YES NO NO ICK3 7 SOUND CHECK IC601 59 L NO ICK1 1 7 SOUND NO IC601 81 H ICK3 2 SOUN...

Страница 142: ... ROR2 level changed From H to L Check U1 MIC1 connection circuit Yes Yes No MIC1 37 38 has data Check MIC1 s circuit and soldering Yes No A DVD Section No pick up home positing MIC1 8 SLD input has data Check the Sled Motor and connection Check U1 MIC1 connection Yes No SLED SLED MIC1 32 33 output are normal Check MIC1 Yes No SLD Waveform DVD Section ...

Страница 143: ...k RIC1 Yes Yes Yes No No Divide LPR1 emitter terminal voltage and 5V real voltage difference into 10ohm DVD Section No Search Operation MIRR U1 146 output is normal Check RIC1 peripheral circuit RFAGCO RIC1 63 output level is normal No No occurs in search range Focus On Yes Yes A See Fine Seek Check No Yes Check pick up No MIRR Waveform DVD Section ...

Страница 144: ...36 T T terminal outputs are normal Check DCN1 and pick up Check MECHA Check RIC1 39 terminal Check SIC3 peripheral circuit Yes Yes Yes Yes Yes Yes No No No No No No TRD Waveform DVD Section Abnormal rotation of disc motor Input of RF SUM signal is normal U1 154 155 SPD output is normal U1 171 After resoldering SIC1 Check or replace disc motor Check path to RIC1 and U1 RIC1 63 output is normal Chec...

Страница 145: ...PEN Waveform DVD Section CD VCD DVD L R output error Mixed Audio output Normal DATA 0 is input in AIC2 2 CHECK AIC2 7 8pin output is normal Check PCB peripheral Pattern shot Check U1 117 output Check U1 1 3 13 16 data clock CD VCD 16 9344MHz DVD 18 432MHz Yes Yes No No AIC4 1 7 output is normal Check AIC4 peripheral circuit Yes No Base terminal level of AQ1 AQ3 are L Check AIC2 11 12 Yes No DATA 0...

Страница 146: ...is 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 21 23 25pin output is normal Change a sceen set Check the circuit ZIC1 and VIC1 Yes No No JACK1 output level is normal Check the connection between VIC1 and JACK1 Yes No Yes Check the connection component cable DVD Se...

Страница 147: ...d normally VIC1 2 Yes No Power is normal at VIC1 1 34 Yes No Pin 5 in VIC1 is in LOW state Yes Check the connection netween pin 133 in ZIC1 and VIC1 Check the connection betwen VIC1 1 and VL6 Check the VIC1 Pheriperal circuit No No Check the connection between VIC1 and output jack Pin of D3 3V in U1 has normal level Check PPIC3 2 3 3V or NOT Yes No Video signal of about 1V appears at output jack Y...

Страница 148: ...ratto II A V Decoder AIC2 PCM1742KE 2CH Audio DAC IC701 PT6961 LED Drive ICK4 ICK5 Karaoke DT701 VIC1 LA73054 Video Amp 6CH S W ICK1 Karaoke MIC AUDIO L R AUDIO L R DIC2 MBM29LV800BA IMB Flash Memory DIC4 TC74VHCT125 Level Shifter IC501 LA72646 Hi FI Audio Processor IC301 LA71750EM LA71730 Video Signal Processor IC601 M37760E VCR Main Micom AUDIO L A V Common VIDEO AUDIO R Pb Y Pr MIC Jack Optical...

Страница 149: ...Samsung Electronics 11 1 11 Wiring Diagram ...

Страница 150: ...re in ohms 1 8W unless otherwise noted Note Special note Most semiconductor devices are electrostatically sensitive and therefore require the special handling techniques described under the electrostatically sensitive ES devices section of this service manual Note Do not use the part number shown on this drawing for ordering The correct part number is shown in the parts list may be slightly differ...

Страница 151: ...Schematic Diagrams 12 2 Samsung Electronics This Document can not be used without Samsung s authorization 12 1 S M P S ...

Страница 152: ...Schematic Diagrams Samsung Electronics 12 3 This Document can not be used without Samsung s authorization 12 2 Power Drive ...

Страница 153: ...Schematic Diagrams 12 4 Samsung Electronics This Document can not be used without Samsung s authorization 12 3 Display Function ...

Страница 154: ...Schematic Diagrams Samsung Electronics 12 5 This Document can not be used without Samsung s authorization 12 4 System Control Servo ...

Страница 155: ...Schematic Diagrams 12 6 Samsung Electronics This Document can not be used without Samsung s authorization 12 5 A V ...

Страница 156: ...Schematic Diagrams Samsung Electronics 12 7 This Document can not be used without Samsung s authorization 12 6 Hi Fi ...

Страница 157: ...Schematic Diagrams 12 8 Samsung Electronics This Document can not be used without Samsung s authorization 12 7 A2 NICAM ...

Страница 158: ...Schematic Diagrams Samsung Electronics 12 9 This Document can not be used without Samsung s authorization 12 8 TM China Hong Kong Only ...

Страница 159: ...Schematic Diagrams 12 10 Samsung Electronics This Document can not be used without Samsung s authorization 12 9 TM ...

Страница 160: ...Schematic Diagrams Samsung Electronics 12 11 This Document can not be used without Samsung s authorization 12 10 Input Output ...

Страница 161: ...Schematic Diagrams 12 12 Samsung Electronics This Document can not be used without Samsung s authorization 12 11 Karaoke ...

Страница 162: ...Schematic Diagrams Samsung Electronics 12 13 This Document can not be used without Samsung s authorization 12 12 DVD AV Decoder ...

Страница 163: ...Schematic Diagrams 12 14 Samsung Electronics This Document can not be used without Samsung s authorization 12 13 DVD Servo ...

Страница 164: ...Schematic Diagrams Samsung Electronics 12 15 This Document can not be used without Samsung s authorization 12 14 DVD Audio Video ...

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Samsung DVD-V642K, Руководство по обучению

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Содержание DVD-V642K

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