Samsung DVD-V940K Training Manual Download

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Disassembly and Reassembly

5-5

Samsung Electronics

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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

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BAND BRAKE ASS’Y

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DISK S REEL

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LEVER S BRAKE ASS’Y

GEAR IDLE

LEVER IDLE

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LEVER T BRAKE ASS’Y

DISK T REEL

Summary of Contents for DVD-V940K

Page 1: ...ing 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 V2...

Page 2: ...f 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 orde...

Page 3: ...rwriters 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 m...

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 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...

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: ...7Kohm 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 RC...

Page 18: ...in the direction of arrow Fig 5 1 Cabinet Top Removal 5 1 2 Ass y Bottom Cover Removal RELEASE 2 HOOKS Bottom View 5 1 4 Function PCB Removal RELEASE 1 HOOK Fig 5 4 Function PCB Removal Fig 5 2 Ass y...

Page 19: ...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...

Page 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...

Page 21: ...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 22: ...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 23: ...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 24: ...in this time you have to grasp the Lever FL Cassette R Continuously until the Holder FL Cassette Ass y is taken out completely Note Be sure to insert Lever FL Cassette R in the direction of A to prev...

Page 25: ...3 Remove the Gear FL cam Note When reinstalling be sure to reassemble Slider FL drive after you insert the Boss of Lever FL ARM R in Groove of Slider Fl drive Assembly Align the Gear FL Cam with the...

Page 26: ...5 Gear Worm Wheel Removal 1 Remove the Gear Worm 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...

Page 27: ...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 28: ...Cam as shown in drawing Refer to Timing Point 3 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 Lever...

Page 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 t...

Page 30: ...E 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 Bra...

Page 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...

Page 32: ...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 33: ...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 34: ...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 35: ...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 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 3 SCREWS A B C MOTOR CAPSTAN ASS Y Fig 5 40 Motor C...

Page 37: ...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 in the state of set hor...

Page 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 PO...

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

Page 40: ...emoval 1 Insert a Screw Driver into Emergency Hole and push 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 Fig 5 46 Tray D...

Page 41: ...he 1 Screw and lift up the Ass y P U Deck in the direction arrow A 3 When the Ass y P U Deck lift up a little push Chassis Sub in the direction of arrow B and lift up the Ass y P U Deck Fig 5 47 Assy...

Page 42: ...g in the direction arrow B 4 Push the 1 Hook in the direction of arrow C and lift up the Slider Housing 5 Remove the Belt Pulley and 2 Screws Ass y Motor Load 6 Push the 1 Hook in the direction of arr...

Page 43: ...Feed B Gear Feed A 3 Remove the 2 Screws 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 Shaft Pick Up Ass y Pi...

Page 44: ...cing 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 butt...

Page 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...

Page 46: ...l 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 ag...

Page 47: ...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 3...

Page 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...

Page 49: ...d 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 Fi...

Page 50: ...t 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 g...

Page 51: ...ference 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 T...

Page 52: ...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 53: ...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 54: ...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 adjustme...

Page 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...

Page 56: ...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 57: ...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 th...

Page 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 Cen...

Page 59: ...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 60: ...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 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 ci...

Page 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...

Page 63: ...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 64: ...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 65: ...Circuit Operating Descriptions 7 7 Fig 7 12 Block Diagram...

Page 66: ...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 67: ...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 68: ...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 69: ...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 70: ...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 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 rot...

Page 72: ...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 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 progr...

Page 74: ...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 75: ...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 76: ...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 77: ...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 78: ...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 79: ...t 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 T...

Page 80: ...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 81: ...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 82: ...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 83: ...omponents 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...

Page 84: ...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 85: ...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 86: ...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 87: ...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 88: ...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 89: ...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 90: ...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 91: ...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 92: ...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 93: ...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 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...

Page 95: ...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 96: ...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 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 co...

Page 98: ...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...

Page 99: ...ow 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...

Page 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 volt...

Page 101: ...ED 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 trac...

Page 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 DI...

Page 103: ...g 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...

Page 104: ...a 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 wa...

Page 105: ...mpressed 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 i...

Page 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...

Page 107: ...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 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 ente...

Page 109: ...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 110: ...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 111: ...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 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...

Page 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 th...

Page 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...

Page 115: ...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 116: ...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 117: ...VCR Deck Operating Description 8 12 Samsung Electronics Fig 8 14 Mecha Timing Chart...

Page 118: ...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 119: ...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 120: ...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 121: ...r 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 tra...

Page 122: ...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 123: ...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 124: ...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 125: ...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 126: ...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 127: ...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 128: ...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 129: ...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 130: ...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 131: ...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 132: ...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 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 IC60...

Page 134: ...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 135: ...ECK 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...

Page 136: ...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 CHE...

Page 137: ...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 138: ...E 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 MIS...

Page 139: ...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 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 MOT...

Page 141: ...S 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...

Page 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 dat...

Page 143: ...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...

Page 144: ...6 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 ro...

Page 145: ...EN 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 U...

Page 146: ...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 21 23 25pin output...

Page 147: ...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...

Page 148: ...atto 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 D...

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

Page 150: ...e 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 electrostat...

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

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

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

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

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

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

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

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

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

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

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

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

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

Page 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-V940K, Training Manual

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