Luma VCR425, Service Manual

Page 1: ...rvicing I Adjustment Procedures I Schematic Diagrams I CBA s Sec 2 Deck Mechanism Section I Standard Maintenance I Alignment for Mechanism I Disassembly Assembly of Mechanism I Alignment Procedures of...

Page 2: ...Disassembly Instructions 1 5 1 Electrical Adjustment Instructions 1 6 1 Block Diagrams 1 7 1 Function Indicator Symbols 1 7 9 Schematic Diagrams CBA s and Test Points 1 8 1 Waveforms 1 9 1 Wiring Diag...

Page 3: ...Vp p 0 8 1 0 1 2 1 3 Video S N Y R P dB 40 45 SP Mode W O Burst 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...

Page 4: ...specially 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 S...

Page 5: ...arts RF 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 Po...

Page 6: ...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 CBA when removing entire flat pack IC first apply soldering iron to center of the fla...

Page 7: ...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 5 3 While heating the pins using a fine tip soldering iron or ho...

Page 8: ...cur due to a potential difference 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 s...

Page 9: ...will stop the function of Tape Start Sensor Tape End Sen sor and Reel Sensors If these TPs are connected before plugging in the unit the function of the sensors will stay valid See Fig 1 Note Because...

Page 10: ...Be careful not to break them 1 Release Locking Tab L 3 and remove Screw S 2 five Screws S 3 three Screws S 4 and Screw S 5 Then slowly lift the VCR Chassis Unit Deck Assembly Function CBA Jack CBA an...

Page 11: ...1 5 2 HC2C0DC S 1 S 1 S 1 1 Top Case Fig 1 L 2 L 1 2 Front Assembly L 2 Fig 2 S 4 S 3 S 3 S 3 S 4 3 VCR Chassis Unit L 3 S 5 Fig 3 S 6 4 Jack CBA Desolder Fig 4...

Page 12: ...Assembly TOP VIEW From FE Head From Cylinder Assembly From AC Head Assembly Lead with red stripe Lead with white stripe Lead with white stripe From Capstan Motor Assembly Lead connections of Deck Asse...

Page 13: ...cope Dual 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 point during playback Symptom...

Page 14: ...YNC 58 SW506 REC SAFETY TO VIDEO BLOCK TO AUDIO BLOCK 2 2 KEY 2 4 4 KEY 1 KEY SWITCH KEY SWITCH CL505 CN651 FUNCTION CBA 1 7 1 1 7 2 HC341BLS SDA SDA SCL SCL TU701 TUNER UNIT IC503 MEMORY 72 83 I2C BU...

Page 15: ...C501 OSD REC VIDEO SIGNAL PB VIDEO SIGNAL MODE SP REC SERIAL DECORDER V OUT1 1 V IN1 1 3 3 V OUT2 1 V IN2 3 1 3 JACK CBA 48 50 52 56 24 6 50 52 19 20 JK101 V OUT1 V IN1 19 20 JK102 CL151 CL152 CL101 C...

Page 16: ...GND CL501 1 7 5 1 7 6 HC341BLA MAIN CBA PB AUDIO SIGNAL REC AUDIO SIGNAL Mode SP REC 71 A MUTE H I2C BUS SCL I2C BUS SDA TO SERVO SYSTEM CONTROL BLOCK FULL ERASE HEAD 68 69 SERIAL DECODER DECK ASSEMB...

Page 17: ...check to see that all components 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...

Page 18: ...L TAPE IN 1 When reel and capstan mechanism is not functioning correctly 2 When tape loading mechanism is not functioning correctly 3 When cassette loading mechanism is not functioning correctly 4 Wh...

Page 19: ...fully The use of substitute replacement parts that do not have the same safety characteristics as speci fied in the parts list may create shock fire or other hazards Capacitor Temperature Markings Not...

Page 20: ...only original replacement parts which are listed with their part numbers in the parts list section of the service manual 4 Wire Connectors 1 Prefix symbol CN means connector can disconnect and reconn...

Page 21: ...1 8 3 1 8 4 1 8 5 HC341SCM1 Main 1 4 Schematic Diagram Note When it is necessary to replace one or more of the following Diodes all five should be replaced D561 D562 D563 D564 D565 1...

Page 22: ...1 8 6 1 8 7 1 8 8 HC341SCM2 Main 2 4 Schematic Diagram...

Page 23: ...1 8 9 1 8 10 1 8 11 HC341SCM3 Main 3 4 Schematic Diagram...

Page 24: ...GAINST FIRE HAZARD REPLACE ONLY WITH THE 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 comp...

Page 25: ...Jack Schematic Diagram 1 8 15 1 8 16 HC341SCJ...

Page 26: ...1 8 17 1 8 18 Function Schematic Diagram HC341SCF...

Page 27: ...re you connect the AC plug to the AC power supply Otherwise it may cause some components in the power supply circuit to fail BECAUSE A HOT CHASSIS GROUND IS PRESENT IN THE POWER SUPPLY CIRCUIT AN ISOL...

Page 28: ...use some components in the power supply circuit to fail BECAUSE A HOT CHASSIS GROUND IS PRESENT IN THE POWER SUPPLY CIRCUIT AN ISOLATION TRANSFORMER MUST BE USED ALSO IN ORDER TO HAVE THE ABILITY TO I...

Page 29: ...Jack CBA Top View Jack CBA Bottom View BHC400F01018 E 1 8 25 1 8 26...

Page 30: ...Function CBA Top View Function CBA Bottom View 1 8 27 1 8 28 BHC400F01018 B...

Page 31: ...usec 50mV x 10 WAVEFORMS TP751 of Main CBA WF1 UPPER WF2 LOWER V OUT 0 1V x 10 RF SW 0 5V x 10 50usec TP751 of Main CBA TP302 of Main CBA WF5 C PB 10mV x 10 RF SW 0 5V x 10 5msec UPPER LOWER WF2 TP302...

Page 32: ...E HEAD CONTROL HEAD AE H AE H FE H A COM A PB REC CTL CTL 6 5 4 3 2 1 CL287 M LOADING MOTOR CYLINDER ASSEMBLY AE H 1 AE H FE H 2 A COM 3 A PB REC 4 CTL 5 CTL 6 V COM 5 V R 2 6 V R 1 1 V COM 2 V L 2 3...

Page 33: ...H L 19 N U Not Used 20 N U Not Used 21 N U Not Used 22 N U Not Used 23 OUT POWER LED STANDBY LED Sig nal Output H L 24 OUT CAS LED TAPE IN LED Sig nal Output H L 25 OUT TIMER LED TIMER LED Signal Out...

Page 34: ...REV Control Signal FWD L REV H H L 79 IN S REEL Supply Reel Rotation Signal PULSE 80 IN T REEL Take Up Reel Rotation Signal PULSE 81 OUT LM FWD REV Loading Motor Control Signal H L Hi z 82 N U Not Use...

Page 35: ...TB QSZAB0RMB111 E C B BN1F4M T BA1F4M T KTA1266 GR KTC3199 Y GR BL 2SC2785 J H F K KRA103M KRC103M KRA104M BN1L4M T KTA1281 Y 2SC1815 Y TPE2 2SC1815 GR TPE2 2SC2120 Y TPE2 KTC3203 Y 2SC1815 BL TPE2 2S...

Page 36: ...ixtures and Tools 2 2 1 Mechanical Alignment Procedures 2 3 1 Disassembly Assembly Procedures of Deck Mechanism 2 4 1 Alignment Procedures of Mechanism 2 4 9 Sec 2 Deck Mechanism Section I Standard Ma...

Page 37: ...ove refer to Deck Exploded Views B73 Recording Model only H Hours Check I Change Deck Periodic Service Schedule Ref No Part Name 1 000 H 2 000 H 3 000 H 4 000 H B2 Cylinder Assembly I I B3 Loading Mot...

Page 38: ...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 39: ...ignment Tape FL6N8 1 speed only FL6NS8 2 speed only Azimuth and X Value Adjustment of Audio Control Head Adjustment of Envelope Waveform J 2 Guide Roller Adj Screwdriver Available Locally Guide Roller...

Page 40: ...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 41: ...the X value and envelope Not good Do the final tape traveling test to see that the tape runs normally in play mode with out creasing or slacking Completion Not good OK OK OK Not good Not good OK Flow...

Page 42: ...sition of the Audio Control Erase Head Symptom of Misalignment If the Horizontal Position of the Audio Control Erase Head is not properly aligned maximum envelope can not be obtained at the Neutral po...

Page 43: ...of Guide Roller 2 Refer to Fig M3 so that the waveform looks like the one shown in Fig M9 4 If the envelope is as shown in Fig M8 adjust the height of Guide Roller 3 Refer to Fig M3 so that the wavefo...

Page 44: ...S 5 8 8 Loading Motor Assembly T DM1 DM7 Desolder LDG Belt 2 S 6 9 9 AC Head Assembly T DM1 DM7 S 7 10 2 Tape Guide Assembly T DM1 DM8 P 2 11 10 Door Opener B T DM1 DM8 L 1 L 2 12 11 Pinch Arm B T DM...

Page 45: ...ng Arm S B Assembly B DM2 DM15 Refer to Alignment Sec Pg 2 4 9 36 35 Loading Arm T B Assembly B DM2 DM15 Refer to Alignment Sec Pg 2 4 9 37 2 25 M Brake T HI Assembly T DM1 DM16 P 6 38 2 25 M Brake S...

Page 46: ...2 4 3 U25PALDA 14 13 11 10 12 7 50 8 33 44 42 31 32 41 43 46 45 47 9 37 15 39 40 38 Fig DM1 Top View Fig DM2 Bottom View 35 19 36 24 25 27 26 23 28 34 20 29 22...

Page 47: ...shing the locking tab as shown in the right slide and pull up the right side on 2 to release Pin A and Pin B from the slots A Then remove Pin C and Pin D on 2 from the slots B as shown 1 2 A Fig DM4 3...

Page 48: ...of 12 are in the grooves of 28 as shown 11 13 12 A 10 L 1 P 3 Adj Screw P 2 L 2 View for A Fig DM8 17 16 18 S 11 L 3 After removing the Screw S 11 while pressing the Locking Tab L 3 remove 16 Fig DM10...

Page 49: ...2 4 6 U25PALDA S 12 19 Cap Belt Fig DM11 Fig DM12 20 C 1 21...

Page 50: ...31 C 6 Pin of 37 Pin of 34 Position of Mode Lever when installed Pin of 38 23 P 4 C 3 P 4 28 28 23 When installing 23 install the spring P 4 to 28 as shown in the left figure and then install 23 while...

Page 51: ...2 4 8 U25PALDA 36 34 33 P 5 L 5 35 Refer to the Alignment Section Page 2 4 9 Fig DM15 L 6 P 7 P 6 C 7 38 44 41 39 43 37 40 turn turn turn 42 C 8 Fig DM16 45 46 47 L 7 Fig DM17 49 48 Slide Fig DM18...

Page 52: ...the mechanical or electrical parts Alignment points in Eject Position Alignment 1 Loading Arm S and T Assembly Install Loading Arm S and T Assembly so that their triangle marks point to each other as...

Page 53: ...y Install the Rack Assembly so that the first tooth on the gear of the Rack Assembly meets the first groove on the Cam Gear A as shown in Fig AL4 Cam Gear A First tooth First groove on the Cam Gear A...

Page 54: ...SECTION VIDEO CASSETTE RECORDER VCR425 TABLE OF CONTENTS Exploded Views 3 1 1 Mechanical Parts List 3 2 1 Electrical Parts List 3 3 1 Deck Parts List 3 4 1 Sec 3 Exploded views and Parts List Section...

Page 55: ...3 1 1 HC341FEX A1X EXPLODED VIEWS Front Panel...

Page 56: ...021 2L021 2L021 2L021 2B5 2L022 2L022 2L022 2L022 2L042 2L031 2L051 2L012 2B18 2B9 A4 2L099 2B9 2L041 2L041 A2 2L011 2L011 2L011 2L011 2L011 FUNCTION CBA A7 A3 A10 MAIN CBA 2L041 2B14 JACK CBA 2B7 2B8...

Page 57: ...3 1 3 HC341PEX Some Ref Numbers are not in sequence X4 S1 X2 X20A X3 X20B Unit S3 X1 S2 S2 A14 Packing...

Page 58: ...nce Mark Description SLIDUS OIL 150 B2 B35 B553 B410 B411 B494 B567 L1053 B74 B10 L1191 B73 B9 B12 B492 B11 B571 B37 B126 L1466 B501 B8 B121 B426 B560 L1450 L1051 L1467 Floil G 374G Blue grease Chassi...

Page 59: ...se Bottom Side Grease point B569 B513 B502 B570 B491 B565 L1151 B525 B522 B31 L1406 B148 B521 B520 B416 B518 B564 B487 B573 B574 B499 B27 B508 B414 B505 B572 B558 B557 B568 B417 B585 B3 B551 Bottom Si...

Page 60: ...B347 L1321 B359 B529 B360 B361 B359 B529 B360 Type B Type A Note There are two different but interchangeable types of CLEANER LEVER B359 in this model and have different combination with B361 Please...

Page 61: ...List 2B8 BUSH LED F H3700UD See Electrical Parts List 2B9 CUSHION HC460ED 0VM413251 2B14 CUSHION PCB HC460ED 0VM413265 2B18 FIBER TOP CASE HC460ED 0VM412906 2B46 ROHM HOLDER H7770JD See Electrical Par...

Page 62: ...TFZ473 C151 CHIP CERAMIC CAP F Z 0 1 F 50V or CHD1JZB0F104 CHIP CERAMIC CAP F Z 0 1 F 25V or CHD1EZB0F104 CHIP CERAMIC CAP FZ Z 0 1 F 50V or CHD1JZBFZ104 CHIP CERAMIC CAP F Z 0 1 F 50V or CHD1JZ30F104...

Page 63: ...CHIP CERAMIC CAP CG J 68pF 50V or CHD1JJBCG680 CHIP CERAMIC CAP CH J 68pF 50V or CHD1JJ3CH680 Ref No Description Part No CHIP CERAMIC CAP CG J 68pF 50V CHD1JJ3CG680 C325 CHIP CERAMIC CAP F Z 0 1 F 50V...

Page 64: ...CAP CH J 220pF 50V or CHD1JJ3CH221 CHIP CERAMIC CAP CG J 220pF 50V CHD1JJ3CG221 Ref No Description Part No C428 CHIP CERAMIC CAP CH J 68pF 50V or CHD1JJBCH680 CHIP CERAMIC CAP CG J 68pF 50V or CHD1JJ...

Page 65: ...853 CHIP CERAMIC CAP B K 4700pF 50V or CHD1JKB0B472 CHIP CERAMIC CAP B K 4700pF 50V CHD1JK30B472 C854 CHIP CERAMIC CAP B K 0 01 F 50V or CHD1JKB0B103 CHIP CERAMIC CAP B K 0 01 F 50V CHD1JK30B103 C855...

Page 66: ...f No Description Part No L703 PCB JUMPER D0 6 P5 0 JW5 0T L704 INDUCTOR 15 H K 26T LLAXKATTU150 L705 PCB JUMPER D0 6 P5 0 JW5 0T L851 INDUCTOR 1 8 H K 26T LLAXKATTU1R8 L853 PCB JUMPER D0 6 P5 0 JW5 0T...

Page 67: ...C2785 H or QQSH02SC2785 TRANSISTOR 2SC2785 F or QQSF02SC2785 Ref No Description Part No TRANSISTOR 2SC1815 Y TPE2 or QQSY02SC1815 TRANSISTOR 2SC1815 GR TPE2 QQS102SC1815 RESISTORS R002 METAL OXIDE FIL...

Page 68: ...1608 1 10W J 5 6M or RRXAJB5Z0565 CHIP RES 1608 1 10W J 5 6M RRXAJR5Z0565 Ref No Description Part No R331 CHIP RES 1608 1 10W J 10k or RRXAJB5Z0103 CHIP RES 1608 1 10W J 10k RRXAJR5Z0103 R332 CHIP IND...

Page 69: ...1 10W J 10k RRXAJR5Z0103 R529 CARBON RES 1 4W J 270 RCX4JATZ0271 R530 CHIP RES 1608 1 10W J 180 or RRXAJB5Z0181 Ref No Description Part No CHIP RES 1608 1 10W J 180 RRXAJR5Z0181 R531 CHIP RES 1608 1...

Page 70: ...ER MSF 015 XH01Z00LY001 J902 BEAD CORE B16 RH 3 5X10X1 3 or XL03010XM001 BEAD CORE HF70BB3 5X10X1 3 XL03010TE001 JW001 FLAT CABLE 8P AWG26 2651 P1 25 150 WX1HC267 001 JW002 FLAT CABLE 8P AWG26 2651 P1...

Page 71: ...XL03010XM001 BEAD CORE HF70BB3 5X10X1 3 XL03010TE001 TRANSISTORS Q101 TRANSISTOR KTA1266 GR or NQS40KTA1266 TRANSISTOR 2SA1015 GR TPE2 QQS102SA1015 Q102 TRANSISTOR KTA1266 GR or NQS40KTA1266 TRANSIST...

Page 72: ...64C B300 C DRIVE LEVER R MK11 0VM305068 B303 F DOOR OPENER MK11 0VM203299 B347 GUIDE HOLDER A MK10 0VM304920 B354 SLIDER R MK11 0VM101040 B355 SLIDER L MK11 0VM203296 B359 CLEANER LEVER MK10 or 0VM304...

Page 73: ...GEAR HYT N12G5F or 0VM412379 CENTER GEAR MK11 0VM305081 B582 TR GEAR SPRING MK10 0VM411187 B583 REEL WASHER MK9 5 2 1 0 5 0VM410058 B584 TR GEAR SHAFT MK10 0VM411186 B585 PSW 317505 MK11 0VM413663 B58...

Page 74: ...VCR425 HC341ED...