Page 1: Table Of Contents
10. Block Diagram 11. Wiring Diagram 12. Schematic Diagrams This Service Manual is a property of Samsung Electronics Co .,Ltd. © Samsung Electronics Co., Ltd. APR. 2004 Any unauthorized use of Manual can be punished under applicable Printed in Korea International and/or domestic law.
Page 2 IMPORTANT SERVICE GUIDE ◆ MODE SWITCH (PROGRAM SWITCH) ASSEMBLY POINT 1) When installing the ass’y deck on the Main PCB, be sure to align the assembly point of mode switch. ASSEMBLY POINT VCR MAIN PCB Fig. 1 ◆ HOW TO EJECT THE CASSETTE TAPE (If the tape is stuck in the unit) 1) Turn the Gear Worm Œ...
Page 3: Precautions
Metal Part cal return path to the chassis. Any current measured must not exceed 0.5mA. Reverse the instrument power cord plug in the out- ohmmeter let and repeat the test. See Fig. 1-1. Fig. 1-2 Insulation Resistance Test Samsung Electronics...
Page 4 (5) antenna wiring. Always inspect in all areas tinuously and new instructions are issued whenev- for pinched, out-of-place, or frayed wiring, Do not er appropriate. change spacing between a component and the printed-circuit board. Check the AC power cord for damage. Samsung Electronics...
Page 5: Servicing Precautions
Components identi- fied by shading, by( ) or by ( ) in the circuit dia- gram are important for safety or for the characteris- tics of the unit. Always replace them with the exact replacement components. Samsung Electronics...
Page 6 (6) Do not remove a replacement ESD device from its protective package until immediately before your are ready to install it.(Most replacement ESD devices are packaged with leads electrically short- ed together by conductive foam, aluminum foil or comparable conductive materials). Samsung Electronics...
Page 7 ◆ 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. Samsung Electronics...
Page 8 3) Make solder land 2 points short on Pick-up. (See Fig. 1-4) 4) Disassemble the Pick-up. Note : If the assembly and disassembly are not done in correct sequence, the Pick-up may be damaged. SOLDER LAND 2 POINTS SHORT PICK-UP ASS'Y Fig. 1-4 Samsung Electronics...
Page 9: Reference Information
Reflective layer Semi-reflective layer Polycarbonate Polycarbonate Dual Side Dual Layer : 17GByte Dual Side Single Layer : 9.5GByte Polycarbonate Polycarbonate Semi-reflective layer Reflective layer Reflective layer Bonding layer Bonding layer Reflective layer Reflective layer Semi-reflective layer Polycarbonate Polycarbonate Samsung Electronics...
Page 10 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. Samsung Electronics...
Page 11 Recording type Dolby Digital Linear PCM MPEG-1 Layer 2 AUDIO Transmission rate 448Kbps/stream 6.144Mbps/stream 224Kbps 1 Analog CH. Channel 5.1CH/stream 8CH/stream 1 Stream of Dolby Digital 2 Digital CH. (16Bit/44.1KHz) Sampling frequency 48KHz 16, 20, 24Bit/48, 96KHz 16Bit/44.1KHz Samsung Electronics...
Page 12 Data loss and enables Time efficient compression. Loss area ◆ MPEG-1 (Fixed compression : Max. 1/140) Amount of data ✓ Frame unit compression. ✓ Compresses all data using the same ratio. Video-CD - Fast movements are jagged, and unnatural Time Samsung Electronics...
Page 13 ✓ Various Digital Recordings are possible as shown in the table to the right. Sampling Frequency Bit Rate 16bit 48KHz 20bit 24bit 16bit 96KHz 20bit 24bit ◆ Dolby Digital compatible Audio Mode Channel Format Audio Coding Front Surround (Rear) Remark Mode Mono Stereo Mono Mono Surround Samsung Electronics...
Page 14 ◆ 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. Note ; Only enable to be worked correctly by an appropriate data supported this function in Disc. Samsung Electronics...
Page 15 ✓ Region 5 : Russia, Eastern Europe, India, Africa. ✓ Region 6 : China. ✓ Region 0 : Worldwide (All Code) ˆ Œ ´ Œ Ø ´ Œ ˇ ˆ ¨ ´ ¨ ◆ Adoptation of the Macrovision System disables the copying on to other media. Samsung Electronics...
Page 16 ✓ Different Authoring Process are used accoring to the Software developers, and this may affect the DVD image quality. ⌘ Authoring Process bit stream Video/Audio MPEG-2 Master Encoding Disc Production bit stream Video/Audio Surround Audio AC-3/MPEG Audio Cutting Subtitle Master Encoding Master Multiplexing bit stream Subtitle Subtitle Master Encoding Authoring Process Samsung Electronics...
Page 17: Product Specification
Video S/N Above 43dB (standard recording) Resolution Above 240 lines (standard recording) Audio S/N Above 50dB (Hi-Fi), 39dB (Mono) Audio frequency characteristics 20Hz - 20KHz (Hi-Fi) Disc DVD, CD (12Cm), CD (8Cm), Audio S/N 95dB Audio dynamic range 105dB Samsung Electronics...
Page 18: Disassembly And Reassembly
5-1-2 Ass’y Bottom Cover Removal Œ RELEASE 2 HOOKS ´ RELEASE 3 HOOKS (Bottom View) Fig. 5-3 Ass’y Front Panel Removal (Bottom View) 5-1-4 Function PCB Removal Fig. 5-2 Ass’y Bottom Cover Removal Œ RELEASE 1 HOOK Fig. 5-4 Function PCB Removal Samsung Electronics...
Page 19: Chassis Removal
5-1-6 VCR Main PCB Removal Œ REMOVE 4 SCREWS When installing the ass'y full deck on the Main PCB, be sure to align the assembly point of mode switch. MODE SWITCH ASSEMBLY POINT VCR MAIN PCB Fig. 5-6 VCR Main PCB Removal Samsung Electronics...
Page 20: Circuit Board Locations
Disassembly and Reassembly 5-2 Circuit Board Locations Fig. 5-7 Circuit Board Locations Samsung Electronics...
Page 21: Vcr Deck Parts Locations
5-3-1 Top View ´ Œ ˇ ¨ Ø ˆ 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 Samsung Electronics...
Page 22 ´ CYLINDER ASS’Y ˝ GEAR IDLE ˇ ACE HEAD ASS’Y Ô LEVER IDLE ¨ LEVER UNIT PINCH ASS’Y  LEVER T BRAKE ASS’Y ˆ LEVER #9 GUIDE ASS’Y Ò DISK T REEL Ø LEVER TENSION ASS’Y ∏ BAND BRAKE ASS’Y Samsung Electronics...
Page 23 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 Samsung Electronics...
Page 24 Lever FL Cassette-R ´ at disassembling and "C" reassembling. Œ LEVER FL ARM ASS'Y Fig. 5-12 Lever FL Arm Ass’y Removal Œ HOLDER FL RAIL [B] CASSETTEE ASS'Y ´ LEVER FL CASSETTEE -R "A" BOSS [A] Fig. 5-11 Holder FL Cassette Ass’y Removal Samsung Electronics...
Page 25 "C" Fig. 5-13 Lever FL Door Removal ´ GEAR FL CAM Œ SLIDER FL DRIVE Fig. 5-14 Slider FL Drive Removal Œ GEAR FL CAM GEAR WORM WHEEL POST TIMING POINT Fig. 5-15 Gear FL Cam, Gear Worm Samsung Electronics...
Page 26 1) Remove the Gear Worm wheel Œ. 1) Remove the Drum connecting part of Cable Flat Œ from Connector Waffer ´. ´ CONNECTOR WAFER Œ CABLE FLAT Œ GEAR WORM WHEEL Fig. 5-16 Gear Worm Wheel Removal Fig. 5-17 Cable Flat Removal Samsung Electronics...
Page 27 ´ BRAKET GEAR Œ SCREW Fig.5-18 Motor Loading Ass’y Removal Fig. 5-19 Bracket Gear, Gear Joint 1,2 Removal Œ GEAR JOINT1 ´ GEAR JOINT2 ˇ SLIDER CAM TIMING POINT 2 TIMING POINT 1 Fig. 5-20 Gear Joint 1,2 Assembly 5-10 Samsung Electronics...
Page 28 Fig. 5-21 Gear Loading Drive, Slider Cam, PIN A PIN D PIN C PIN B Lever T, S Load Ass’y Removal ˇ SLIDER CAM Fig. 5-22 Gear Loading Drive, Slider Cam, Lever Load S, T Ass’y Assembly Samsung Electronics 5-11...
Page 29 Main Base to the Mark[B]. ˇ BAND BRAKE ASS`Y ´ LEVER TENTION ASS`Y Fig. 5-23 Lever Pinch Drive, Œ SPRING TENTION LEVER Lever Tension Drive Removal STOPPER "A" MARK[B] Fig. 5-24 Lever Tension Ass’y, Band Brake Ass’y Removal 5-12 Samsung Electronics...
Page 30 ´ GEAR IDLE "B" HOOK(A) HOOK "C" ´ GEAR IDLE ˇ SPRING BRAKE Œ LEVER S BRAKE ASS'Y HOOK(C) HOOK(B) ´ LEVER T BRAKE ASS`Y Fig. 5-26 Gear Idle Ass’y Removal Fig. 5-25 Lever Brake S, T Ass’y Removal Samsung Electronics 5-13...
Page 31 Center Ass'y as shown in detail B. Œ WASHER SLIT ´ HOLDER CLUTCH ASS`Y Fig. 5-27 Disk S, T Reel Removal DETAIL A <BAD> SPRING <GOOD> DETAIL B SPRING <BAD> <GOOD> Fig. 5-28 Holder Clutch Ass’y Removal 5-14 Samsung Electronics...
Page 32 ´ GEAR CENTER ASS`Y Fig. 5-31 Guide Cassette Door Removal Fig. 5-29 Lever Up Down Ass’y Removal GEAR CENTER ASS'Y GUIDE LEVER UP DOWN ASS'Y RING GEAR POST HOOK MAIN BASE Fig. 5-30 Lever Up Down Ass’y Removal Samsung Electronics 5-15...
Page 33 Œ LEVER UNIT PINCH ASS`Y ´ LEVER #9 GUIDE ASS`Y "B" ´ PLATE JOINT ˇ SPRING PINCH DRIVE Fig. 5-33 Lever #9 Guide Ass’y Removal Fig. 5-32 Lever Unit Pinch Ass’y, Plate Joint, Spring Pinch Drive Removal 5-16 Samsung Electronics...
Page 34 2) Lift the FE Head ´. 2) Remove the screw Œ. 3) Lift the ACE Head Ass’y ´. Œ FE HEAD Œ SCREW ´ HEAD ACE ASS`Y Fig. 5-34 FE Head Removal Fig. 5-35 ACE Head Removal Samsung Electronics 5-17...
Page 35 2) When reinstalling, Don't push down too much on Screw Driver. Œ 3 SCREWS Fig. 5-36 Slider S, T Ass’y Removal ´ PLATE GROUND DECK ˇ CYLINDER ASS'Y Fig. 5-37 Plate Ground Deck, Cylinder Ass’y Removal 5-18 Samsung Electronics...
Page 36 Tip. (Refer to Fig. 5-39) 2) Rotate the Damper Capstan in the direction of allow Note : Damper Capstan use the Sankyo Capstan Motor (FQVB65) Only. ´ MOTOR CAPSTAN ASS'Y Fig. 5-40 Motor Capstan Ass’y Removal Fig. 5-39 Damper Capstan Removal Samsung Electronics 5-19...
Page 37 3) Rotate Gear Worm Œ clockwise using screw driver Œ HOOK again up to the state of eject mode and then pick out the tape.(Refer to Fig.5-42) SLEEVE-HEAD CLEANER FRAME Fig. 5-42 Lever Head Cleaner Ass’y Removal Fig. 5-44 5-20 Samsung Electronics...
Page 38 ∆ ∆ ∆ BELT PULLEY HOLDER CLUTCH ASS’Y ∆ GEAR CENTER ASS’Y GEAR IDLE (2Point) LOADING MOTOR BAND BRAKE ASS’Y BRAKE T ASS’Y ◆ : Add Oil ∆ : Cleaning O : Check and replacement in necessary Samsung Electronics 5-21...
Page 39: 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 ´. ´ HOLDER CHUCK Œ 2 HOOKS "A" Œ 2 HOOKS "A" Fig. 5-45 Holder Chuck Removal 5-22 Samsung Electronics...
Page 40 2) When the Tray Disc ¨ comes out a little, pull it in the direction arrow “B” by hand. ˇ SLIDER HOUSING ¨ TRAY DISC "B" "A" ´ EMERGENCY HOLE Œ SCREW DRIVER Fig. 5-46 Tray Disc Removal Samsung Electronics 5-23...
Page 41 ˇ ASS'Y P/U DECK ¨ CHASSIS SUB <Assembly Point> "B" SP + (RED) Œ 4 SOLDERING SP - (BLK) TM - (BLK) SL - (BLK) TM + (BLK) SL + (RED) Fig. 5-47 Assy P/U Deck Removal 5-24 Samsung Electronics...
Page 42 ∏ 2 SCREWS Ô GEAR TRAY ˝ GEAR PULLEY "D" ’ 1 HOOK "C" ´ 2 HOOKS ˆ 1 HOOK ” ASS'Y MOTOR LOAD "A" "A" ˇ ASS'Y PCB DECK Œ 2 SOLDERING Fig. 5-48 Ass’y Housing Removal Samsung Electronics 5-25...
Page 43 Ø 2 SCREWS ” 2 SCREWS ∏ MOTOR FEED ASS'Y ’ MOTOR SPINDLE Ò ASS'Y PICK UP Ô 3 HOLDER CAM SKEW ˝ 3 SCREWS  SHAFT PICK UP ´ CHASSIS SUB Fig. 5-49 Ass’y Bracket Deck Removal 5-26 Samsung Electronics...
Page 44: Alignment And Adjustment
- When the adjustment is completed, be sure to turn the power off. 6-1-1(a) Location of adjustment button of remote control STANDBY/ON OPEN/CLOSE X-Point (Tracking Center) Adjustment ; NVRAM Option Setting ; KARAOKE SEARCH Head Switching Adjustment ; KARAOKE VOLUME PROG / TRK Fig. 6-1 Samsung Electronics...
Page 45 Alignment and Adjustments 6-1-1(b) TEST location for adjustment mode setting SHORT Fig. 6-2 VCR Main PCB (Top View) Samsung Electronics...
Page 46 25 26 27 28 29 30 31 32 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 33 34 35 36 37 38 39 40 MOVE : SAVE : ENTER MOVE : COMPLETE Fig. 6-3 Fig. 6-4 Samsung Electronics...
Page 47 6, 7, 8, 9, 10, 12, 17, 18, 19, 20, 22, 30, 34, 36, 37, 38, 42, 44, 47, 48, 50, 51, 57, 61, 63, 65, 66 DVD-V940K/XSS, XSV 6, 7, 8, 9, 10, 12, 17, 18, 19, 20, 22, 30, 34, 36, 37, 38, 42, 44, 47, 48, 50, 51, 57, 61, 63, 65, 66...
Page 48: Dvd Adjustment
Alignment and Adjustments 6-2 DVD Adjustment 6-2-1 Location of Test Point Pin 29 of RIC1 Fig. 6-5 Location of test Point (Main PCB - Top Side) Samsung Electronics...
Page 49 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) Samsung Electronics...
Page 50 If you cannot obtain a Flat waveform, then the unit is defective. Note : The Deck must be in a horizontal position. Use both “A” and “B” screws to adjust. Typical Waveform before Adjustment Waveform after Correct Adjustment Fig. 6-7 Envelope Waveform Samsung Electronics...
Page 51: Vcr Mechanical Adjustment
Fig. 6-8 Location of Tape Transport Adjustment PINCH ROLLER FE HEAD CYLINDER ASS'Y GUIDE ROLLER "S" GUIDE ROLLER "T" POST TENSION #8 GUIDE POST #9 GUIDE POST #3 GUIDE POST MAIN BASE ACE HEAD CAPSTAN SHAFT Fig. 6-9 Tape Travel Diagram Samsung Electronics...
Page 52 HEIGHT ADJUST X-POSITION ADJUSTING SLIT SCREW (B) SCREW (D) AZIMUTH ADJUST X-POSITION LOCKING Fig. 6-10 Location of ACE Head Adjustment Screw AUDIO HEAD VIDEO HEAD 0 ~ 0 .25 mm CONTROL HEAD Fig. 6-11 ACE Head Height Adjustment Samsung Electronics...
Page 53 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. 6-10) 6-10 Samsung Electronics...
Page 54 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) AUDIO OUTPUT ENVELOPE HEAD SWITCHING CONTROL PULSE Fig. 6-13 Location of Test point (VCR Main PCB-Top View) Samsung Electronics 6-11...
Page 55 5) If the section B in Fig. 6-15 does not meet the specification, adjust the guide roller T up or down. a b c d c,b,d/a Fig. 6-14 Envelope Waveform Adjustment H'D SWITCHING PULSE ENVELOPE Fig. 6-15 Adjustment Points 6-12 Samsung Electronics...
Page 56 ) driver to obtain a flat video RF envelope as shown in Fig. 6-16. IDEAL ENVELOPE S HEIGHT TOO HIGH S HEIGHT TOO LOW T HEIGHT TOO HIGH T HEIGHT TOO LOW GUIDE ROLLER S GUIDE ROLLER T Fig. 6-16 Guide Roller S, T Height Adjustment Samsung Electronics 6-13...
Page 57 2) If excessive tape wrinkle is observed, perform the following adjustments in Playback mode : ◆ Tape wrinkle at the guide roller S, T section : Linearity adjustment. ◆ Tape wrinkle at tape guide flange : ACE head assembly coarse adjustment. 6-14 Samsung Electronics...
Page 58 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. <Table 6-4> MODE TORQUE g/cm GAUGE 42 ± 11 Cassette Torquemeter 145 ± 30 Cassette Torquemeter Samsung Electronics 6-15...
Page 59: Circuit Operating Description
Circuit Operating Descriptions 7. Circuit Operating Descriptions 7-1 Power Supply (Free Voltage) (1) Comparsion between Linear Power Supply and S.M.P.S. (a) Linear Vout Vreg REGULATOR Common power (Ex.220V 50Hz) – – (Np) (Ns) Fig. 7-1 Linear Power Supply ◆ Waveform/Description Input : Common power to transformer (Vp).
Page 60 Circuit Operating Descriptions ◆ Advantages and disadvantages of linear power supply Change by common power 1) Advantages : Little noise because the output waveform Vout of transformer is sine wave. 2) Disadvantages : Vreg Œ Additional margin is required because Vs is chan- ged (depending on power source).
Page 61 Circuit Operating Descriptions (2) Circuit description (FLY-Back PWM (Pulse Width Modulation control) (a) AC Power Rectification/Smoothing Terminal 1) D1SS01, D1SS02, D1SS03, D1SS04 : Convert AC power to DC(Wave rectification). 2) C1SS10 : Smooth the voltage converted to DC. 3) L1SS01, L1SS02, C1SS01, C1SS02 : Noise removal at power input/output. 4) R1SS01 : Rush current limit resistance at the moment of power cord insertion.
Page 62 Circuit Operating Descriptions (d) Feedback Control Circuit Trans D1SS13 L1SS05 5.8V IC1SS2 C1SS16 C1SS35 DRAIN & R1SS31 R1SS34 R1SS33 IC1S02 C1SS27 R1SS32 1st GND IC1S03 2.5V R1SS35 2nd GND Fig. 7-8 1) F/B terminal of IC1SF01 determines output duty cycle. 2) C-E(Collector-Emitter) of IC1SF01 and F/B potential of IC1SF01 are same.
Page 63 Circuit Operating Descriptions (3) Internal Block Diagram (a) Internal Block Diagram of S.M.P.S. Circuit Smoothing Circuit 33V Rectified Smoothing Circuit Noise Converter Removal 24V Rectified (SNUBBER) Smoothing Circuit Rectified Circuit 5V Rectified 5V Rectified VoltageCircuit(X2) Smoothing Circuit PWM Control 9V Rectified Line Filter Circuit VoltageCircuit...
Page 64 Circuit Operating Descriptions 7-2 System Control REMOCON SYSCON DISPLAY MECHA BLOCK IIC COMMON Hi-Fi IC MICOM SERVO EPROM IC TM BLOCK SERVO BLOCK AV BLOCK OSD BLOCK Fig. 7-11 Micom Block Diagram (1) Outline The system control circuit inputs the commands given by the operator to set the mechanism and circuit to the commanded mode.
Page 65 Circuit Operating Descriptions Fig. 7-12 Block Diagram...
Page 66 Circuit Operating Descriptions (2) Mechanism/Circuit Control When the u-COM inputs operator’s commands via the key input or remote input, the mechanism and circuits are set to the command mode. This function controls mechanism/servo section and audio/video processing section. 1) Cassette Loading Control Controls loading and ejection of a cassette and determines the mechanism operation mode;...
Page 67 Circuit Operating Descriptions (3) Program SW Input The mechanism state for each mode is shown in table 7-1 below. The mechanism state is classified into position, and correlation between the switch position and mechanism state is shown in table 7-1, also. Table 7-1 : Prog.
Page 68 Circuit Operating Descriptions (5) Stop Mode The VCR enters the stop mode when the stop button is pressed during playback, record, rewind and fast forward mode. When trouble is detected, the VCR enters the stop mode to protect the tape and mechanism or when the tape reaches the end, etc.
Page 69 Circuit Operating Descriptions (11) Slow Mode • State input ; Press the still button and next press the FF button on the remote control. • Indication output ; First digit rotates in LED display. • Output at ; IC601 Pin 25 (CAP F/R) : Hi (12) Frame Advance Mode Views one stop-action “frame”...
Page 70 Circuit Operating Descriptions (16) Fast Forward Mode Tape fast forward operation using capstan motor. • State input ; Press the rewind button in the stop or fast forward modes. • Indication output ; First digit rotates in LED display. • Output at ; IC601 Pin 25 (CAP F/R) : Hi (17) Rewind Mode...
Page 71 Circuit Operating Descriptions (20) Trouble Detection The trouble detection circuits are provided to protect the from damage (Fig. 7-15). The reel lock sensor detects incorrect rotation of supply and take up reel. The reel lock sensor consists of the disk and photo sensor installed at the bottom of the reel disk.
Page 72 Circuit Operating Descriptions (23) Tape Counter Control Fig. 7-16 is a simplified diagram of the tape counter control circuit. The tape counter in the u-COM counts the control pulses derived from control head. The control signal on the control track of the tape is picked up by the control head and supplied to pins 85, 86 of IC601.
Page 73 Circuit Operating Descriptions (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 timer clock data. (26) Power Failure Detection u-COM goes to the power failure mode when the 61 port is lower than 4/5 of AD Vcc level.
Page 74 Circuit Operating Descriptions 7-3 Servo (1) Outline The servo system is divided into three loops. The cylinder servo controls the rotation of video heads, the capstan servo controls the tape speed, and the tension. In addition it’s necessary to control cylinder motor, especially during trick play in 4H’D models.
Page 75 Circuit Operating Descriptions Fig. 7-18 Block Diagram 7-17...
Page 76 Circuit Operating Descriptions (2) Capstan Speed Error Detector The capstan speed control operates so as to hold the capstan at a constant rotational speed, by measuring the peri- od of the CFG signal. A digital counter detects the speed deviation from a preset value. The speed error data is added to phase error data in a digital filter.
Page 77 Circuit Operating Descriptions (5) Drum Phase Error Detector Drum phase control must start operating after the drum motor is brought to the correct rotational speed by the speed control system . Drum speed control works as follows in record and playback. ◆...
Page 78 Circuit Operating Descriptions (7) V-Lock Phase V-lock pulse is used for adjusting the picture’s vertical vibration in trick play (still,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.
Page 79 Circuit Operating Descriptions 7-4 VCR Video (1) Luminance Signal Recording System AV V IN TU V OUT VIDEO F. B YNR Y/C 3 MHz CLAMP COMB AV VIDEO OUT QV/QH INSERT MAIN DETAIL CLAMP EMPH EMPH clock data FM EQ CLIP SP H'D CURRENT...
Page 80 Circuit Operating Descriptions 2) Main Emphasis Circuit The dynamically emphasized luminance signal is now supplied to the main emphasis circuit where all the high frequency components of the signal are boosted more than the low frequency components. The boosting action is required for the high frequency components because in the FM recording method, the noise of the playback signal increases in proportion to the modulated signal frequency or low level signal.
Page 81 Circuit Operating Descriptions (2) Luminance Signal Playback System PB EQ DOUBLE PHASE LIMIT DEMOD MA2N FM-EQ DE-EMPHA 91 92 91 93 3.5MHZ FM AGC CLAMP 91 90 YNR Y/C 91 43 DEEMPHA COMB H'D S/W 91 46 NOISE H'D AMP S/W CANCELL PICTURE 6dB AMP...
Page 82 Circuit Operating Descriptions 4) FM DEMODULATOR The FM demodulator consists of a stable mono multivibrator balanced modulator (BM) and a LPF. The FM demodulator circuit first converts the FM signal to a pulse width modulator signal. Then the circuit smoothes the PWM signal to demodulate the video signal.
Page 83 Circuit Operating Descriptions (3) Chroma Signal Recording System AV V IN TU V AT VIDEO YNR Y/C 4.43MHz COMB MAIN 1.3MHz BURST CONVERTER EMPHA SP H'D CURRENT REC LUMINANCE SLP H'D IC301 LA71750/30M Fig. 7-23 Chrominance Record Process 1) Outline Fig.
Page 84 Circuit Operating Descriptions 2) ACC (Automatic Color Gain Control) Circuit The ACC is used as burst ACC in the LP mode, however it is also used for peak ACC in the SP/SLP mode. The purpose of using two different ACC operations is to improve the overall Chroma S/N ratio during playback. In SP and SLP, there is H-sync alignment.
Page 85 Circuit Operating Descriptions (4) Chroma Signal Playback System 91 96 91 92 91 93 1.3 MHz BURST MAIN ACC AMP UP AMP CONV 91 90 BURST 4.43MHz YNR Y/C 4.43MHz DE-EMPHA BPF 1 COMB BPF 2 H'D S/W H'D AMP S/W COLOR PB AMP Y/C MIX...
Page 86 Circuit Operating Descriptions 7-5 Hi-Fi Audio (1) Outline Hi-Fi circuit consists of HiFi audio LPF, VCO, BPF, FM detect circuit and switching noise compensator, PRE-AMP etc. Linear audio consists of an ALC circuit,REC EQ circuit and a PB EQ circuit. Hi-Fi and Linear audio share the same input selector,output selector and mute circuit.
Page 87 Circuit Operating Descriptions (2) Block Description 1) Input Selector Input selector outputs 1 signal from 4 different signals received. It outputs 1 selected signal from tuner, rear, front. 2) Normal(Linear) Selector Two signals,L-CH and R-CH are inputed to Hi-Fi IC.But,linear audio is capable of receiving only one signal. Therefore the 2 input signals must be selected.
Page 88 Circuit Operating Descriptions 14) Hold Pulse It makes standard signal(Pulse) to compensate SW noise. 15) DET(Hi-Fi/LINEAR) From the Hi-Fi envelope inputed from pre-amp,it decides whether the signal passing through L-CH BPF is Hi-Fi or LINEAR tape it’s size(the signal passing through BPF is below 10mVpp, it is not Hi-Fi, therefore, it output linear) 16) DOC(Drop Out Compensation) If demodulation is conducted without properly treating the damage on Hi-Fi envelope caused by scratch on...
Page 89 Circuit Operating Descriptions 7-6 Linear Audio (1) Block Diagram OUTPUT 12KHz HEAD BIAS LINE PB ON 60KHz REC ON PB ON INPUT Fig. 7-27 Block Diagram (2) Block Description 1) ATT (Attenuation) Line amp is shared between PB mode and E/E mode, which reduces the recorded signal by 20dB and resister. 2) ALC (Auto Level Control) If the signal level is lower than the reference signal (-6dBm) level, the output signal will equal the input signal.
Page 90 Circuit Operating Descriptions 5) PB AMP The diagram to the left is the playback amp and the gain input/output are as PB AMP follows. INPUT OUTPUT Av = 1 + The playback characteristic of VHS format can be satisfied by using Z the above equation.
Page 91 Circuit Operating Descriptions 7-7 TM (1) Outline RF and frequency synthesized tuning system General description : The receiving circuit consists of both ANT input and output circuits, channel selection cir- cuit, PIF circuit and SIF circuit. The receiving circuit selects a desired broadcast signal from TV signals induced on an antenna and sends stable video and audio signals to their respective processing circuits.
Page 92 Circuit Operating Descriptions (3) Modulator Section A. RF Modulator generates, from a baseband video and audio signal, PLL frequency synthesized RF TV channel signal in VHF band. (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. VIDEO IN TO TUNER SECTION ANTENNA...
Page 93 Circuit Operating Descriptions (4) Tuner Block A. Low pass filter & high pass filter This consists of IF trap circuit and UHF & VHF separation circuit. If the input signal is IF(45.75MHz), this filter prevents interference. B. Single tune & RF AMP This consists of a filter circuit, RF AMP, impedance conversion circuit, image trap and a single tuning circuit.
Page 94 Circuit Operating Descriptions (5) IF Block A. SAW FILTER It passes only needed band of the signal that is converted to IF frequency and decrease other band to minimize the effect of adjacent channel. B. IF AMP IF signal ,which is selected in SAW FILTER, is amplified in IF amp frequency enough to be detected. The IF AMP has parallel inputs &...
Page 95 Circuit Operating Descriptions 7-8 MTS 1) Outline The Multiplex signal that come from Tuner/demode block(TM block IF DEMOD) enters into the MTS IC11 pin and sap or stereo signal can be detected. The components of the signal are roughly separated 4 areas(stereo,dbx,matrix and sap) 2) STEREO BLOCK (a) L+R(Main)
Page 96 Circuit Operating Descriptions PEAK DEV AM-DSB-SC dbx-TV TELEMETRY dbx-TV NR FM 3KHz FM 10KHz 50-15KHz 50-10KHz 6.5f = f15.734KHz Fig. 7-34 Base Band Spectrum 7-38...
Page 97 Circuit Operating Descriptions 7-9 DVD System Control (1) Outline The main micom circuit is composed of IM flash memory (DIC2) to bosting system and data saving, 64bit SDRAM (DIC5) for temporary data read and write The Micom (U1, ES6698 & ES6629) mounted in main board 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.
Page 98 Circuit Operating Descriptions 7-10 DVD RF (1) RIC1 (ES6603 = SP3723C) The main furction of this IC is control the DVD RF signal by eolualiziny. This IC has a favction “(aser power control). This function makes a RF signal to grnerale a RF signal from pickoup by stable control.
Page 99 Circuit Operating Descriptions 7-11 DVD Servo (1) Outline SERVO system of DVD is Compoced of Focusing SERVO, Tracking SERVO, SERVO and CLV SERVO (spindle motor servo) 1) Focusing SERVO : Focuses the optical spot output from object lens onto the disc surface. Maintains a uniform distance between object lens of Pick-up and disc (for surface vibration of disc).
Page 100 Circuit Operating Descriptions (3) Operation 1) FOCUSING SERVO (a) Focus Input The focus loop is changed from open loop to closed loop, and the triangular waveform moves the object lens up and down (at pin 172 of U1 during Focus SERVO ON.) At that time, S curve is input to pin 142 of U1. SBAD (pin 34 of RIC1) signal, summing signal of PD A, B, C, D, is generated, and zero cross(1.65V) point occurs when S curve is focused and SBAD signal exceeds a preset,constant value.
Page 101 Circuit Operating Descriptions B. SEARCH Mode : Search mode : Fine seek,(Moving the tracking actuator slightly little below 255 track) and coarse search, moving much in use of sled motor. The coarse search will be described in sled linked servo and now, the fine seek is explained shortly.
Page 102 Circuit Operating Descriptions 7-12 DVD Data Processor (1) Outline IC601 resed the DVD main micom U1, by 5 line communication. When the DVD system setup, micom and flash memry comunicate with each other and then DVD system is booted. After the flash set the system micomunicate with RIC1 and MIC1 by seqnence. RIC1 set the servo and moving SLED, focclsing actuator to check the disc.
Page 103 Circuit Operating Descriptions 7-13 DVD Video (1) Outline U1(A/V decoder with video encoder) diverges from the 27MHz crystal, then generates VSYNC and HSYNC. U1(A/V decoder with video encoder) does RGB encoding, copy guard processing and D/A conversion of 8bit video data internally inputted from video decoder block by Micro Process block. Video signal converted into analog signal is outputted via amplifier of analog part.
Page 104: Dvd Audio
Circuit Operating Descriptions 7-14 DVD Audio (1) Outline A/V decoder (U1 ; Vibratto∏) is supply to DATA 0 for 2-channel mixed audio output. The audio data transmitted from A/V decoder (U1 ; Vibratto∏) are converted into analog signal via audio D/A converter and outputted via post filter and amplifier.
Page 105 Circuit Operating Descriptions (3) DVD Audio Output Source Data Types : MPEG-1,-2, Dolby Digital, CD-DA, LPCM, WMA DIC2 (LOCAL DRAM) ZIC1 (Vibratto II ; A/V DECODER) HOST or DVD/CD INTERFACE RECEIVER IEC-958/1937 IEC-958/1937 AUDIO INPUT DECODER BUFFER OUTPUT PROCESS INTERFACE (IEC-958/1937) Compressed Data WMA 2-Channel LPCM, Decoded...
Page 106: Vcr Deck Operating Description
Tension post Tape sensor Tape loading Reel brake REC-inhibiting SW Pinch lever Idle gear Cassette holder Loading motor cam gear Reel sensor (Front loading setion) (Loading motor drive section) (Front loading setion) Fig. 8-1 Basic Configuration of Mechanism Samsung Electronics...
Page 107 Fig. 8-2 Tape Path System Cylinder T slant guide S slant guide ACE head Tension post Capstan No.9 guide Pinch roller FE head No.8 guide T guide roller S guide roller show the locations to be adjusted. Fig. 8-3 Guide Path System Samsung Electronics...
Page 108 ACE head No. 8 guide Pinch roller Cylinder Capstan No. 9 guide Tape guide Tension post Tape guide S (Supply) reel disc Idle gear Capstan belt Clutch gear (Clutch mechanism) T (Tape-up) reel disc Fig. 8-4 Reel Drive System Samsung Electronics...
Page 109 (9) When the cassette is out, the reverse steps of the above procedure are carried out. Cassette Loading Complete Tape Loading Full Loading Mode Fig. 8-5 Loading motor FL arm lever FL drive slider FL camgear Worm wheel Fig. 8-6 Drive Transmission Path Samsung Electronics...
Page 110 No. 8 guide FE head Pinch roller Cylinder Capstan No. 9 guide Tape guide S guide roller Tape guide S (Supply) reel disc Idle gear Capstan belt Clutch gear (Clutch mechanism) T (Tape-up) reel disc Fig. 8-7 Cassette IN/OUT Mode Samsung Electronics...
Page 111 In this case, tape tension applied to the cylinder is decreased to protect the tape and to prevent the tape from scratches. Samsung Electronics...
Page 112 FE head No. 8 guide Pinch roller Cylinder Capstan No. 9 guide Tape guide Tension post Tape guide S (Supply) reel disc Idle gear Capstan belt Clutch gear (Clutch mechanism) T (Tape-up) reel disc Fig. 8-9 FF/REW Mode Samsung Electronics...
Page 113 FE head No. 8 guide Pinch roller Cylinder Capstan No. 9 guide Tape guide Tension post Tape guide S (Supply) reel disc T (Tape-up) reel disc Clutch gear (Clutch mechanism) Capstan belt Idle gear Fig. 8-10 Record/Playback Mode Samsung Electronics...
Page 114 FG pulse CTL pulse (Linear time counter) AUDIO Control IIC BUS VIDEO REC control TUNER Cylinder motor control Cylinder Cylinder motor motor drive POWER ON/OFF REC mute FG/PG pulse TV/VCR Fig. 8-11 System Control Block Diagram Samsung Electronics...
Page 115 The mechanism operates as shown in Fig. 8-13 according to the timing chart in Fig. 8-14. Note : The Start Sensor is actuated by the horizontal moving of Slider FL Drive and turned on or off by insertion or ejec- tion of a cassette. 8-10 Samsung Electronics...
Page 116 T loading lever assembly S loading lever assembly Loading motor Loading drive gear FL cam gear Joint gear 1 Cam slider T brake S brake Pinch drive lever Tension drive lever Joint gear 2 Fig. 8-13 Mechanical Operation Samsung Electronics 8-11...
Page 117 VCR Deck Operating Description Fig. 8-14 Mecha Timing Chart 8-12 Samsung Electronics...
Page 118 - S BRAKE is detached from S REEL DISC completely. So S REEL DISC is free. Fig. 8-15 2) SOFT BRAKE(during LOADING, STOP 1, FF/REW 1) - The small load is given to S REEL DISC. Fig. 8-16 Samsung Electronics 8-13...
Page 119 - T BRAKE is detached from T REEL DISC completely. So T REEL DISC is free. Fig. 8-18 2) SOFT BRAKE (UNLOADING Completion ,STOP 1, FF/REW 2 ) - The small load is given to T REEL DISC. Fig. 8-19 8-14 Samsung Electronics...
Page 120 VCR Deck Operating Description 3) REVERSE SEARCH BRAKE (RPS) - The medium load is given to T REEL DISC. Fig. 8-20 4) MAIN BRAKE (on the loading, STOP 2) - The large load is given to T REEL Fig. 8-21 Samsung Electronics 8-15...
Page 121 The circuit configuration of the mode sensor drive is shown in Fig. 8-22. CN604 Load (+) IC601 CAPSTAN MOTOR L.M B+ Loading motor DRIVE IC L,M CTL 58 Load (-) AL 5V LM F/R AL 5V SW603 Mode SW Fig. 8-22 Mode Sensor Drive 8-16 Samsung Electronics...
Page 122 After 300msec the loading motor rotates in the forward direction and enters the tape loading operation. T slider assembly S slider assembly No. 9 guide lever Tension arm T brake (soft) S brake (off) Idle lever assembly Fig. 8-23 Cassette-Loading Mode (Position I) Samsung Electronics 8-17...
Page 123 ˇ The tension post touches the tape, band brake force is applied, and the tension servo brake mechanism actuates. ¨ Brakes for the reel discs are all off. T slider assembly S slider assembly Tension lever No. 9 guide lever T brake (soft) S brake (off) Fig. 8-24 Tape Loading Operation (Position II) 8-18 Samsung Electronics...
Page 124 OFF --> ON, and the capstan motor stops. (2) IC601 makes the loading motor stop after 150ms passed from sensing “ON”. (3) Also IC601 makes the loading motor rotate in the forward direction after 120ms passed. Samsung Electronics 8-19...
Page 125 4) The S, T soft brakes are being applied. T slider assembly Pinch assembly (off) S slider assembly Tension lever (off) T brake (soft) S brake (off) Fig. 8-25 Stop Mode (Position V) 8-20 Samsung Electronics...
Page 126 IV (playback mode), thus setting the playback standby mode. T slider assembly Pinch assembly (OFF) Tension lever (OFF) No. 9 guide lever (OFF) S brake (OFF) T brake (soft brake) Fig. 8-26 FF/REW 2 Mode (Position VII) Samsung Electronics 8-21...
Page 127 (6) The recording speed data identified by IC601 is displayed in the Led module. Pinch assembly (ON) Tension lever (ON) No. 9 guide lever (OFF) S brake (OFF) T brake (OFF) Fig. 8-27 Playback Mode (Position IV) 8-22 Samsung Electronics...
Page 128 The tape is taken up at a constant torque by the clutch mechanism. (The mechanical operation is the same as that in the playback mode.) (4) The recording speed data identified by IC601 is displayed on the Led module. Samsung Electronics 8-23...
Page 129 (5) The recording speed data identified by IC601 is displayed on the Led module. Pinch assembly (ON) Tension lever (OFF) No. 9 guide lever (ON) S brake (OFF) T brake (RPS brake) Fig. 8-28 RPS Mode (Position III) 8-24 Samsung Electronics...
Page 130 (3) After completion of the rewinding for synchronous editing, the cam slider is in the position IV (playback mode), the cylinder motor is rotating, and the capstan motor and the loading motor stop. Samsung Electronics 8-25...
Page 131: Troubleshooting
9. Troubleshooting Samsung Electronics...
Page 132 Troubleshooting Samsung Electronics...
Page 133 Troubleshooting Samsung Electronics...
Page 134 Troubleshooting Samsung Electronics...
Page 135 Troubleshooting Samsung Electronics...
Page 136 Troubleshooting Samsung Electronics...
Page 137 Troubleshooting Samsung Electronics...
Page 138 Troubleshooting Samsung Electronics...
Page 139 Troubleshooting Samsung Electronics...
Page 140 Troubleshooting 9-10 Samsung Electronics...
Page 141 Troubleshooting Samsung Electronics 9-11...
Page 142 Troubleshooting 9-12 Samsung Electronics...
Page 143 Troubleshooting Samsung Electronics 9-13...
Page 144 Troubleshooting 9-14 Samsung Electronics...
Page 145 Troubleshooting Samsung Electronics 9-15...
Page 146 Troubleshooting 9-16 Samsung Electronics...
Page 147 Troubleshooting Samsung Electronics 9-17...
Page 148: Block Diagram
DIC4 IC602 EEPROM (TC74VHCT125) (M37760E) DIC3 (24C02) Level Shifter VCR Main Micom EPROM ICK4/ICK5 IC701 DIC2 Karaoke (PT6961) (MBM29LV800BA) LED Drive IMB Flash Memory MIC Jack STEREO (DT701) Samsung Electronics 10-1 This Document can not be used without Samsung’s authorization...
Page 149: Wiring Diagram
11. Wiring Diagram Samsung Electronics 11-1...
Page 150: Schematic Diagrams
12-14 DVD Audio/Video - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 12-15 <Component Side> Samsung Electronics 12-1 This Document can not be used without Samsung’s authorization...
Page 151: Schematic Diagrams
Schematic Diagrams 12-1 S.M.P.S. 12-2 Samsung Electronics This Document can not be used without Samsung’s authorization...
Page 152: Power Drive
Schematic Diagrams 12-2 Power Drive Samsung Electronics 12-3 This Document can not be used without Samsung’s authorization...
Page 153: Display/Function
Schematic Diagrams 12-3 Display/Function 12-4 Samsung Electronics This Document can not be used without Samsung’s authorization...
Page 154: System Control/Servo
Schematic Diagrams 12-4 System Control/Servo Samsung Electronics 12-5 This Document can not be used without Samsung’s authorization...
Page 155: A/V
Schematic Diagrams 12-5 A/V 12-6 Samsung Electronics This Document can not be used without Samsung’s authorization...
Page 156: Hi-Fi
Schematic Diagrams 12-6 Hi-Fi Samsung Electronics 12-7 This Document can not be used without Samsung’s authorization...
Page 157: A2/Nicam
Schematic Diagrams 12-7 A2/NICAM 12-8 Samsung Electronics This Document can not be used without Samsung’s authorization...
Page 158: Tm (China/Hong Kong Only)
Schematic Diagrams 12-8 TM (China/Hong Kong Only) Samsung Electronics 12-9 This Document can not be used without Samsung’s authorization...
Page 159 Schematic Diagrams 12-9 TM 12-10 Samsung Electronics This Document can not be used without Samsung’s authorization...
Page 160: Input-Output
Schematic Diagrams 12-10 Input-Output Samsung Electronics 12-11 This Document can not be used without Samsung’s authorization...
Page 161: Karaoke
Schematic Diagrams 12-11 Karaoke 12-12 Samsung Electronics This Document can not be used without Samsung’s authorization...
Page 162: Dvd Av Decoder
Schematic Diagrams 12-12 DVD AV Decoder Samsung Electronics 12-13 This Document can not be used without Samsung’s authorization...
Page 163: Dvd Servo
Schematic Diagrams 12-13 DVD Servo 12-14 Samsung Electronics This Document can not be used without Samsung’s authorization...
Page 164: Dvd Audio/Video
Schematic Diagrams 12-14 DVD Audio/Video Samsung Electronics 12-15 This Document can not be used without Samsung’s authorization...

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Samsung DVD-V940K Training Manual

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