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SERVICE MANUAL

VIDEO CASSETTE RECORDER

29B-250

29B-750

Sec. 1: Main Section

Specifications

Preparation for Servicing

Adjustment Procedures

Schematic Diagrams

CBA’s

Exploded views

Parts List

Sec. 2: Deck Mechanism Section

Standard Maintenance

Alignment for Mechanism

Disassembly/Assembly of Mechanism

Alignment Procedures of Mechanism

Deck Exploded Views

Deck Parts List

PA L

Summary of Contents for 29B-250

Page 1: ...ration for Servicing I Adjustment Procedures I Schematic Diagrams I CBA s I Exploded views I Parts List Sec 2 Deck Mechanism Section I Standard Maintenance I Alignment for Mechanism I Disassembly Asse...

Page 2: ...nt Instructions 1 6 1 Block Diagrams 1 7 1 Function Indicator Symbols 1 7 7 Schematic Diagrams CBA s and Test Points 1 8 1 Waveforms 1 9 1 Wiring Diagrams 1 10 1 IC Pin Function Descriptions 1 11 1 Le...

Page 3: ...1 4 Video Color S N AM R P dB 37 41 SP Mode 1 5 Video Color S N PM R P dB 30 36 SP Mode 1 6 Resolution PB Line 230 245 SP Mode 2 Servo 2 1 Jitter Low sec 0 07 0 12 SP Mode 2 2 Wow Flutter 0 3 0 5 SP...

Page 4: ...especially 1 Wires covered with PVC tubing 2 Double insulated wires 3 High voltage leads D Use specified insulating materials for hazardous live parts Note especially 1 Insulation tape 2 PVC tubing 3...

Page 5: ...termi nals antenna terminals video and audio input and output terminals microphone jacks earphone jacks etc is lower than or equal to the specified value in the table below Measuring Method Power ON...

Page 6: ...chine then apply hot air to the Flat Pack IC about 5 to 6 seconds Fig S 1 1 2 Remove the flat pack IC with tweezers while apply ing the hot air 3 Bottom of the flat pack IC is fixed with glue to the C...

Page 7: ...e flat pack IC When you use solder flux which is applied to all pins of the flat pack IC you can remove it easily Fig S 1 3 2 Affix the wire to a workbench or solid mounting point as shown in Fig S 1...

Page 8: ...nce caused by electro static charge during unpacking or repair work 1 Ground for Human Body Be sure to wear a grounding band 1M that is prop erly grounded to remove any static electricity that may be...

Page 9: ...nto the Deck Mechanism Assembly and press the PLAY button The tape will be loaded into the Deck Mechanism Assembly Make sure the power is on connect TP507 S INH to GND This will stop the function of T...

Page 10: ...S 2 two Screws S 3 29B 250 three Screws S 3 29B 750 and Screw S 4 Then slowly lift the VCR Chassis Unit Deck Assembly Jack CBA and Main CBA up 2 When reassembling solder wire jumpers as shown in Fig D...

Page 11: ...HG242DC Fig D2 L 2 L 1 2 Front Assembly L 2 S 2 S 2 S 4 S 2 S 2 S 3 S 3 3 VCR Chassis Unit Fig D3 1 29B 250 Fig D3 2 S 2 S 2 S 4 S 2 S 2 S 3 S 3 S 3 3 VCR Chassis Unit 29B 750 Fig D4 S 5 4 Jack CBA De...

Page 12: ...sembly From ACE Head Assembly Lead with white stripe Lead with blue stripe Desolder from bottom Lead with blue stripe From Capstan Motor Assembly Lead connections of Deck Assembly and Main CBA Printin...

Page 13: ...l trace with 10 1 probe V Range 0 001 50V Div F Range DC AC 20MHz 2 Alignment Tape FL6A Head Switching Position Adjustment Purpose To determine the Head Switching position during playback Symptom of M...

Page 14: ...N L C SYNC 58 SW506 TO VIDEO BLOCK TO Hi Fi AUDIO BLOCK TO AUDIO BLOCK SDA SDA SCL SCL TU701 TUNER UNIT IC503 MEMORY 72 32 19 83 IIC BUS SCL D V SYNC D REC H RF SW H A SW C ROTA IIC BUS SDA H A COMP V...

Page 15: ...CHARA INS CCD 1H DELAY SP BYPASS MUTE PB EE IN1 TUNER IN1 TUNER MUTE PB EE IN2 IN2 AGC P R R Y C P R P R P Y DELAY Y C MIX 21 79 78 AGC VXO OSD CHARACTER MIX FBC 1 2 58 59 65 29 28 IIC BUS SDA IIC BUS...

Page 16: ...H AUDIO HEAD AUDIO ERASE HEAD AC HEAD ASSEMBLY FE HEAD 2 FE H 1 FE H GND CN501 MAIN CBA PB AUDIO SIGNAL REC AUDIO SIGNAL Mode SP REC 71 A MUTE H AUDIO SW 1 AUDIO SW 2 IIC BUS SCL IIC BUS SDA TO SERVO...

Page 17: ...R IN2 IN1 R ALC DET ALC IC301 AUDIO SIGNAL PROCESS 15 13 17 3 A PB REC CN504 4 A COM 6 AE H 5 AE H FE H AUDIO HEAD AUDIO ERASE HEAD AC HEAD ASSEMBLY FE HEAD 2 FE H 1 FE H GND CN501 MAIN CBA PB AUDIO S...

Page 18: ...Hi Fi AUDIO SIGNAL PROCESS 9 A IN2 L 8 9 8 A OUT2 R 6 A OUT2 L 11 6 11 A IN1 R 9 A IN1 L 7 9 7 A OUT1 R 5 A OUT1 L 11 5 11 IC451 Hi Fi AUDIO R HEAD Hi Fi AUDIO L HEAD CYLINDER ASSEMBLY Hi Fi A R 7 Hi...

Page 19: ...s in the power supply circuit are not defective before you connect the AC plug to the AC power supply Otherwise it may cause some components in the power supply circuit to fail COLD MAIN CBA HOT CIRCU...

Page 20: ...mer stand by H One touch recording H Timer recording H General mode L REC REC mode H REC pause General mode L Blinks at 0 8Hz interval When reel or capstan mechanism is not functioning correctly A R i...

Page 21: ...Hz interval All lighting mode All characters ON When reel or capstan mechanism is not functioning correctly A R is displayed on a TV screen Refer to Fig 1 When tape loading mechanism is not func tioni...

Page 22: ...ror occurs When reel or capstan mechanism is not functioning correctly When tape loading mechanism is not functioning cor rectly When cassette loading mechanism is not functioning correctly When the d...

Page 23: ...umber is shown in the parts list and may be slightly different or amended since these drawings were prepared 2 All resistance values are indicated in ohms K 103 M 106 3 Resistor wattages are 1 4W or 1...

Page 24: ...re prepared 2 To maintain original function and reliability of repaired units use only original replacement parts which are listed with their part numbers in the parts list section of the service manu...

Page 25: ...1 8 3 1 8 4 HG242SCM1 Main 1 6 Schematic Diagram Comparison Chart of Models and Marks MODEL MARK 29B 250 A 29B 750 B...

Page 26: ...Main 2 6 Sensor Schematic Diagrams 1 8 5 1 8 6 HG242SCM2 Comparison Chart of Models and Marks MODEL MARK 29B 250 A 29B 750 B D1 D2 D3 D4 a b c d e g f...

Page 27: ...Main 3 6 Schematic Diagram 1 8 7 1 8 8 HG242SCM3 Comparison Chart of Models and Marks MODEL MARK 29B 250 A 29B 750 B...

Page 28: ...Main 4 6 Jack Schematic Diagrams 1 8 9 1 8 10 HG242SCM4 Comparison Chart of Models and Marks MODEL MARK 29B 250 A 29B 750 B...

Page 29: ...he same type fuse CAUTION Fixed voltage or Auto voltage selectable power supply circuit is used in this unit If Main Fuse F001 is blown check to see that all components in the power supply circuit are...

Page 30: ...Main 6 6 Schematic Diagram B 1 8 13 1 8 14 HG454SCM6 Comparison Chart of Models and Marks MODEL MARK 29B 250 A 29B 750 B...

Page 31: ...AFV Schematic Diagram B 1 8 15 1 8 16 HG454SCAFV Comparison Chart of Models and Marks MODEL MARK 29B 250 A 29B 750 B...

Page 32: ...ING THIS TYPE POWER SUPPLY CIRCUIT A VARIABLE ISOLATION TRANSFORMER IS REQUIRED CAUTION For continued protection against fire hazard replace only with the same type fuse CAUTION Fixed voltage or Auto...

Page 33: ...N TROUBLESHOOTING THIS TYPE POWER SUPPLY CIRCUIT A VARIABLE ISOLATION TRANSFORMER IS REQUIRED CAUTION For continued protection against fire hazard replace only with the same type fuse CAUTION Fixed vo...

Page 34: ...1 8 21 1 8 22 Jack CBA Top View Jack CBA Bottom View BHG470F01014C...

Page 35: ...AFV CBA Top View B AFV CBA Bottom View B Sub Jack CBA Top View B Sub Jack CBA Bottom View B 1 8 23 1 8 24 BHC400F01093 BHG470F01014B Comparison Chart of Models and Marks MODEL MARK 29B 250 A 29B 750 B...

Page 36: ...F3 V OUT E E 10 s 50mV x 10 J23 of Main CBA WF3 UPPER WF1 LOWER V OUT 0 1V x 10 RF SW 0 5V x 10 50 s J23 of Main CBA TP502 of Main CBA WF2 C PB 10mV x 10 RF SW 0 5V x 10 5ms UPPER LOWER WF1 TP502 of M...

Page 37: ...2 3 4 5 6 7 8 9 10 11 CN151 CN101 SIF 1 NU 2 TU AUDIO R 3 GND 4 TU AUDIO L 5 P ON 5V 6 P ON 5V 7 IIC BUS SCL 8 IIC BUS SDA 9 1 2 3 4 5 6 7 8 9 CN701 CN1 GND 1 V OUT2 2 NU 3 V IN2 4 GND 5 A OUT2 R 6 S...

Page 38: ...A Color Phase Rotary Changeover SIgnal H L 16 A N U Not Used B OUT H A SW Video Head Amp Switching Pulse H L 17 A N U Not Used B IN H A COMP Head Amp Comparator Signal H L 18 OUT RF SW Video Head Swit...

Page 39: ...ctive Level 66 OUT C POW SW Capstan Power Switching Signal H L 67 OUT P ON H Power On Signal at High H 68 A N U Not Used B OUT DRV DATA LED Clock Driver IC Control Data H L 69 A N U Not Used B OUT DRV...

Page 40: ...in V Ref for CTL AMP 93 P80 C P80 C Terminal 94 IN OUT CTL Playback Record Control Signal H L 95 IN OUT CTL Playback Record Control Signal H L 96 AMPC CTL AMP Connected Terminal 97 CTLAMP out To Moni...

Page 41: ...266 GR KTA1281 Y KTC3199 BL GR Y RN2204 TE4 T 2SA1015 GR TPE2 2SA1020 Y 2SC1815 BL TPE2 2SC1815 GR TPE2 2SC1815 Y TPE2 2SC2120 Y TPE2 2SC3266 Y TPE2 KTA1267 GR Y KTC3203 Y KTC3205 Y BR24L02F WE2 CAT24...

Page 42: ...1 13 1 HG242FEX EXPLODED VIEWS Front Panel 29B 250 29B 750 A1X A1X...

Page 43: ...ers are not in sequence 2B18 A2 2L011 2L011 2L011 2L011 2L011 2B9 2B9 A23 2L022 2L022 2L012 JACK CBA A5 2L041 A10 2L031 2L099 2L041 2B7 SENSOR CBA 2B8 2B46 A7 A3 2L042 2L021 2L021 2L021 2L021 2L021 2B...

Page 44: ...1 13 3 HG242PEX Packing Some Ref Numbers are not in sequence X2 X3 X20 X1 X4 S1 Unit S3 A14 S2 S2 S9...

Page 45: ...A0FL 1B1 B DECK ASSEMBLY CZD013 VM23ED N23E0FL 2B5 SHEILD CYLINDER HG470ED 0VM306638 2B7 SHIELD ASSEMBLY HG470ED See Electrical Parts List 2B8 BUSH LED F H3700UD See Electrical Parts List 2B9 CUSHION...

Page 46: ...10V M CE1AMASTL471 C022 A ELECTROLYTIC CAP 22 F 16V M H7 CE1CMAVSL220 C025 CHIP CERAMIC CAP 1608 B K 0 01 F 50V CHD1JK30B103 C026 ELECTROLYTIC CAP 47 F 16V M H7 CE1CMAVSL470 C053 ELECTROLYTIC CAP 220...

Page 47: ...ription Part No C332 CHIP CERAMIC CAP 1608 F Z 0 1 F 50V or CHD1JZ30F104 CHIP CERAMIC CAP 1608 F Z 0 1 F 25V or CHD1EZ30F104 CHIP CERAMIC CAP FZ Z 0 1 F 50V CHD1JZ3FZ104 C333 ELECTROLYTIC CAP 0 47 F 5...

Page 48: ...7 C471 B ELECTROLYTIC CAP 10 F 16V M H7 CE1CMAVSL100 C472 B CHIP CERAMIC CAP 1608 F Z 0 1 F 50V or CHD1JZ30F104 Ref No Mark Description Part No B CHIP CERAMIC CAP 1608 F Z 0 1 F 25V or CHD1EZ30F104 B...

Page 49: ...15 A CHIP CERAMIC CAP 1608 B K 0 01 F 50V CHD1JK30B103 Ref No Mark Description Part No C716 B CHIP CERAMIC CAP F Z 0 22 F 16V or CHD1CZ30F224 B CHIP CERAMIC CAP FZ Z 0 22 F 25V CHD1EZ3FZ224 C717 B CHI...

Page 50: ...03010XM001 Ref No Mark Description Part No L002 BEAD CORE B16 RH 3 5X10X1 3 XL03010XM001 L003 LINE FILTER 56MH TLF14CB5630R2 or LLBG00ZTU022 LINE FILTER 50MH LF 4D E503 LLBG00ZKQ009 L009 CHOKE COIL 47...

Page 51: ...E FILM RES 1W J 1 8 or RN011R8ZU001 METAL OXIDE FILM RES 1W J 1 8 RN011R8KE009 Ref No Mark Description Part No R007 CARBON RES 1 6W J 22k or RCX6JATZ0223 CARBON RES 1 4W J 22k RCX4JATZ0223 R008 CARBON...

Page 52: ...1608 1 10W J 12k RRXAJR5Z0123 Ref No Mark Description Part No R426 B CHIP RES 1608 1 10W J 4 7k RRXAJR5Z0472 R427 A CHIP RES 1608 1 10W J 68k RRXAJR5Z0683 R428 A CHIP RES 1608 1 10W J 12k RRXAJR5Z012...

Page 53: ...Z0102 R706 CHIP RES 1608 1 10W J 1k RRXAJR5Z0102 R707 B CHIP RES 1608 1 10W 0 RRXAZR5Z0000 R756 B CHIP RES 1608 1 10W 0 RRXAZR5Z0000 Ref No Mark Description Part No R757 B CHIP RES 1608 1 10W J 75 RRX...

Page 54: ...0 F 6 3V M CE0KMASTL471 C117 ELECTROLYTIC CAP 470 F 6 3V M CE0KMASTL471 Ref No Mark Description Part No DIODES D101 ZENER DIODE DZ 11BSAT265 or NDTA00DZ11BS ZENER DIODE MTZJT 7711A QDTA00MTZJ11 D102 Z...

Page 55: ...ERAMIC CAP 1608 B K 0 01 F 50V CHD1JK30B103 C14 B CHIP CERAMIC CAP 1608 B K 0 01 F 50V CHD1JK30B103 C15 B ELECTROLYTIC CAP 10 F 16V M H7 CE1CMASSL100 C16 B ELECTROLYTIC CAP 10 F 16V M H7 CE1CMASSL100...

Page 56: ...echanical Alignment Procedures 2 3 1 Disassembly Assembly Procedures of Deck Mechanism 2 4 1 Alignment Procedures of Mechanism 2 5 1 Deck Exploded Views 2 6 1 Deck Parts List 2 7 1 Sec 2 Deck Mechanis...

Page 57: ...DECK ADJUSTMENTS 3 For the reference numbers listed above refer to Deck Exploded Views B73 Recording model only B86 Not used in 2 head model h Hours Cleaning I Replace Deck Periodic Service Schedule...

Page 58: ...hard material but since it is very thin avoid cleaning it vertically 2 Wait for the cleaned part to dry thoroughly before operating the unit 3 Do not reuse a stained head cleaning stick or a stained c...

Page 59: ...Alignment Tape FL6N8 2 Head model FL6NS8 4 Head model Azimuth and X Value Adjustment of ACE Head Adjustment of Envelope Waveform J 2 Guide Roller Adj Screwdriver Available Locally Guide Roller J 3 Mi...

Page 60: ...that the Moving guide preparations are in the Eject Position 4 Turn the LDG Belt in the appropriate direction shown in Fig M1 until the Moving guide prepara tions come to the Eject Position Stop turni...

Page 61: ...sing and that there is no slack on the supply and take up side Guide Rollers Use a blank tape Adjust the height of the Guide Rollers Supply side and take up side Use a blank tape Page 2 3 3 Loading Us...

Page 62: ...1 B X Value Alignment Purpose To obtain maximum PB FM envelope signal at the pre set position of the Tracking Control Circuit align the Horizontal Position of the ACE Head Symptom of Misalignment If...

Page 63: ...the enve lope becomes as flat as possible To do this adjust ment turn the top of the Guide Roller with the Guide Roller Adj Screwdriver 3 If the envelope is as shown in Fig M7 adjust the height of Gui...

Page 64: ...eck the number of pushes to ensure preset position The number of pushes CH UP button to achieve 1 2 level of envelope should match the number of pushes CH DOWN button from center If required redo the...

Page 65: ...sembly T DM1H DM7H Desolder LDG Belt 2 S 3 9 9 ACE Head Assembly T DM1H DM7H S 4 10 2 Tape Guide Arm Assembly T DM1H DM8H 1 P 2 11 10 C Door Opener T DM1H DM8H 1 S 4A L 4 12 11 Pinch Arm B T DM1H DM8H...

Page 66: ...Arm B DM2H DM14H P 5 34 26 Loading Arm SP Assembly B DM2H DM14H Refer to Alignment Sec Page 2 5 1 35 34 Loading Arm TU Assembly B DM2H DM14H Refer to Alignment Sec Page 2 5 1 36 16 26 M Brake TU Asse...

Page 67: ...2 4 3 U29PHSDA 14 13 11 10 12 7 49 8 32 43 41 40 31 42 45 44 46 9 36 15 38 37 Fig DM1H Top View 34 19 35 25 26 24 23 27 33 20 28 22 Fig DM2H Bottom View...

Page 68: ...Fig DM4H Pull up Slide 1 2 A 3 6 6 L 2 Pin A Hole A Pin B Hole B L 1 First insert 6 diagonally in 3 as shown below Then install 6 in 3 while pushing L 1 in a direction of arrow After installing 6 in 3...

Page 69: ...h White Stripe A 8 Fig DM7H 11 13 12 10 L 4 P 3 P 2 Fig DM8H 1 Pin of 12 Pin of 10 Groove of 27 View for A When reassembling 10 and 12 confirm that pin of 10 and pin of 12 are in the groove of 27 as s...

Page 70: ...to Fig A Fig A 13 12 P 3 Fig B Top view Install pin of 12 in groove of 27 Refer to Fig B 27 Hold 12 and 13 till groove of pin of chassis looks and fit 13 in notch of chassis Then turn a few 13 while...

Page 71: ...2 4 7 U29PHSDA 19 Cap Belt S 8 19 20 Cap Belt A Installation position of Cap Belt View for A Fig DM11H L 6 22 20 C 1 21 27 Pin on 22 Position of pin on 22 turn Fig DM12H...

Page 72: ...47 First groove on 27 Align 26 and 27 as shown Pin of 36 Pin of 33 Position of Mode Lever when installed Pin of 37 Bottom View Installation of 26 When reassembling 27 meet the first groove on 27 to t...

Page 73: ...2 4 9 U29PHSDA 39 L 10 37 P 6 43 38 36 42 40 41 C 6 C 7 turn turn turn Fig DM15H 44 45 46 L 11 Fig DM16H Slide Plate S 11 47 48 Slide Fig DM17H...

Page 74: ...echanical or electrical parts Alignment points in Eject Position Alignment 1 Loading Arm SP and TU Assembly Install Loading Arm SP and TU Assembly so that their triangle marks point to each other as s...

Page 75: ...lue grease SLIDUS OIL 150 Some Ref Numbers are not in sequence B12 B492 B11 B571 B37 B126 B8 B121 L1450 L1450 B86 L1466 B501 Chassis Assembly Top View Lubricating Point Chassis Assembly Bottom View Lu...

Page 76: ...ow grease B499 B516 B52 B507 B559 B581 B583 B580 B582 A View for A B578 B579 B579 B133 B551 Bottom Side Grease point Some Ref Numbers are not in sequence B488 B491 B513 Bottom Side Grease point L1151...

Page 77: ...nism View 3 Mark Description Floil G 684G or Multemp MH D Blue grease SLIDUS OIL 150 L1341 L1321 B347 L1321 B355 B354 B482 B483 B425 B303 B555 B563 B300 B562 B514 B313 Some Ref Numbers are not in sequ...

Page 78: ...12 0VM101176 B492 MODE GEAR LM MK12 0VM204236 B494 C DOOR OPENER MK12 0VM305719 B499 T LEVER HOLDER MK12 0VM305729 B501 WORM HOLDER MK12 or 0VM203767 WORM HOLDER R MK12 0VM204324 B507 REEL WASHER MK9...

Page 79: ...29B 250 29B 750 HG242BD HG454BD 2004 08 04...

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