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1. 1 VIDEO AUDIO BLOCK 22 10 M2 6309 9301 L301 1C3199 V GR 2 0 AT ioe taal 1508 Y 6 1 LI VIDEO HEAD CL253 1 M 1 e 1 vir 2 s gt Hi Fi COM 8 s TUNER LINE1 4E LINE2 SECAM DET im CONTINUE 1 PAL M DET MAIN 5 5 1 TE m ED E s LPF CONTINUE 1 MAIN 2 5 BEFORE 0807 AAGE OL CONTINUE BUFFER 1 MAIN 1 5 A 1 COMP f TIC BUS SDA N MAIN YR M 9 M BALANGER CON T Ron 5 9 5 3525 9 IT OSD V 0UT E CONTINUE uF RA 1372 F i NL 1 CONTINUE QN 2 M US Te
2. 0717 0 2 SYSCON TIMER SERVO BLOCK 16 4714 1 FP562 LFU 4421 2001A LED DISPLAY 1 1 MI6 32 22 2 8 2 5 0 i 3 3 1 PWR RE i 5 gt z 1 MA gt es CONTINUE 919 am am a LJ PT6958 FN TP TP505 i Ss See ee 6 STS io a GEN f 1 2 3 0 9 0 8 9 00 3 2 3 4 5 06 07 8 9 6 6 2 5 8 1504598512 Tus ar 5 5 0 9 5 69 65 S I 1 2 6 ea CONTINUE Ln 147 SENSOR MAIN 4 5 1564 1562 63 H3 9844 5540 1 SEU WD Oper CBA bie Em 384e 7970 av 33076 VP L 1 I JACK BLOCK 1 1 t 1 I 1 MAIN 3 5 t I 1 W moore 1 1 10751 I 1 751 952 88100245 LD SW 1 I a 8538 1 5 I 10K I 1 5 CONTINUE VI VII I R536 470 8537 22K 2 c 1 H 54514 osu STOP EJ
3. 1 1 en6o5 TO CAPSTAN 40K 1N4148M cL502 MOTOR 1 155133 1 77 1 ALT12V 71 ALTSV A 51 10 3 i C CONT 6 m LM FWD REV 1 88 2 0 10K 9 0 PFG CONTINUE 556 MAIN 2 5 1 L DAV DATA 1 64 M 12V 2 ORV STB C vu 10 10 2 3 6 4 7 0 DRV CLK 6 3 9 4 2115 j a Jo 2 0 21 5 210 19 1 5 1 12 5K 0 1 1 a o 2 o T CONTINUE i NE 8 ALTSV lt gt v 862 1 1 MATN 575 050 V Her 25 04 470 MAIN 5 5 ST S aperi FSC IN 4 43MHz 1K 38 01 Hi Fi H SW KEY 1 See IIC BUS SDA zu 2 L IIC BUS SCL 482 1 gt OSCin iim Lone 519 4 TIC BUS SCL NU 10504 M 24 84 470 1 1 057 145 TIC BUS SDA ACE HEAD CL504 D PFG MICROCONTROLLER 8817 NU TUN SW1 SERVO SYSTEM CONTROL 41 61 EN AMPVREF OUT 42 01 b tH 2 AMPVREFin 43 81 P80 C 1 cTL Loses Ree 1 VETT CTL MAIN 3 5 10501 082 av ri FE H GND CTLAMPout logs 21 T 750v 0 1 APPEL AM
4. NOTE FOR WIRE CONNECTORS TEST POINT INFORMATION 1 PREFIX SYMBOL CN MEANS CONNECTOR D INDICATES A TEST POINT WITH JUMPER WIRE ACROSS HOLE IN THE PCB DISCONNECT AND gt USED TO INDICATE TEST POINT WITH COMPONENT LEAD ON FOIL SIDE Comparison Chart of e SMD 2 PREFIX SYMBOL CL MEANS WIRE SOLDER amp USED TO INDICATE A TEST POINT WITH NO TEST PIN Models amp Marks HOLES OF THE PCB USED TO INDICATE TEST POINT WITH TEST PIN cD Model WIRE IS SOLDERED DIRECTLY b LE IC501 SW1 A VR340 55 MAIN CBA 4 10504 SERVO SYSTEM CONTROL CL509 CIL VR340 75 a 67 CTL AMP OUT gt 1 POWER SWITCH SW507 3 de IO LDsw V MEN MASE KEY 17 SWITCH SENS INHJ VR740 75 0502 64 FF REW L SW2CBA _ 1 TP505 O i EE KEY 2 8 sr L KEY a MOM SWITCH 1 5 _ STS AL 5V C 1 L SWITCH 95 Atem eres T Gol ST S FP562 N f Q504 V 4 END S 9 IC561 LED DISPLAY LED DISPLAY ST S T Y DRV DATA 6 68 DRV DATA G1 TIMERSSV ll _ T REEL RESET 64 RESET DRV CLK
5. alo 2 zm 39 29 2 om 9 20 mz 2 9 20 2 2 m s z m z 2 2 m m 2 m 20 Bf EE fs FE od FFS Fr f FS FF fo Ed dr 2222292822228 lt lt lt lt lt lt lt lt gt lt lt lt lt lt lt lt lt 5 gt lt 4 gt 4 4 5 5 5 BIOS 5 5 5 5 5 0 0 5 0 0101 015 CI 5 5 ooo CI CI 5 5 5 5 01015 ololelolelelolelelelelolo ololololololololo ololololololololololo 9 gt IC 2 gt gt gt gt gt gt I gt gt gt 2 gt gt gt ISR gt gt gt gt gt gt X L gt ILILIL gt gt gt gt L gt L gt gt gt gt Q2 x 0 7v 9 9 9 9 9 7o 9 9 9 VDV V 9 0 5 0 OP 70 09 9 9 9 9 v 9 5 C 5 I gt LI MI XI XI XI X XI C XI X C C X 1 XI MI
6. 2 70 2 70 2 vv 20 D NIN 12 70 2 9 NIN 624 706 707 714 1608 1 10W J 150 OHM 55 555 B 28318 gt zmzzizm 2 22 20 m m m m GEIR AA lt lt 752 754 CHIP RES 1608 1 10VV J 75 OHM 1608 1 10W J 75 OHM 756 851 852 OJO gt I zm m 2 ITI 2 70 2 1608 1 10W J 1 5K OHM CHIP RES 1608 1 10W J 1K OHM 1608 1 10W J 1K OHM 9 NIN alo in gt Ola m m m 2 5 A 501 9965 000 12191 2222222 2222222 2222 3 N N DIDIDI gt DI Dl C1 LULU LUL Oo I I S 5 gt N C5 ICI I SNIS CI O O gt N 0 CI gt A
7. Bottom Side Grease point View for Grease point Some Ref Numbers are not in sequence 2 5 2 UHE274DEX Deck Mechanism View 3 Mark Description Floil G 684G or Multemp MH D Blue grease SLIDUS OIL 150 Some Ref Numbers are not in sequence B514 2 5 3 UHE274DEX DECK PARTS LIST Description 9965 000 17189 CYLINDER ASSEMBLY MK12 PAL 2HD 2SP 9965 000 16630 9965 000 17190 9965 000 17191 9965 000 16632 9965 000 16633 MOVING GUIDE T PREPARATION MK12 9965 000 16634 LOADING ARM TU ASSEMBLY MK12 9965 000 16635 9965 000 16636 9965 000 16637 TAPE GUIDE ARM ASSEMBLY MK12 9965 000 17192 CAPSTAN MOTOR 288 VCCM012 9965 000 08593 CAP BELTMKIO 9965 000 12210 HEAD ASSEMBLY MK11 9965 000 08555 PRISM MK10 9965 000 16640 WORM MK12 9965 000 16641 PULLEY MK12 9965 000 17193 9965 000 17194 9965 000 12368 9965 000 16643 9965 000 16644 F DOOR OPENER MK12 9965 000 16645 DRIVE SPRING MKI2 9965 000 08445 9965 000 16646 9965 000 16647 SLIDER SP MK12 9965 000 08449 CLEANER LEVER MK10 9965 000 06561 9965 000 08450 9965 000 16648 9965 000 16649 9965 000 17195 IM BRAKE SP ASSEMBLY MK12 9965 000 17196 IV ASSEMBLY MK12 9965 000 17197 3002654 MK12 9965 000 08457 LOCK LEVER SPRING MK10 9965 000 08458
8. of E t oo E doa d S 4 5 to 4 2 gt je 4 STE E i E EP er CC C u 9 SM sFFB SF SM AU SM SF SM AU SM AL SS RS AL AU AL SSRS ALAU AL SM FB TL SB EJ LD SW AU AU AU SS SS SF 81 LM FWD M REV C DRIVE 78 C F R N 9 ROTATION ON 67 83 A MUTE H DATA PB 33 D REC H DISPLAY STOP FF STOP REW STOP REC REC PAUSE REC 015 5 Fig 6 274 1 14 7 Comparison Chart of Models and Marks VR340 55 VR340 75 VR740 55 VR740 75 IC501 SERVO SYSTEM CONTROL IC gt 4 5V L lt 1 0V Function Not Used Active Level Video Head Switching Pulse Signal Adjusted Voltage P ON Power Detection Input Signal Tape End Position Detect Signal Automatic Frequency Control Signal Video Envelope Comparator Signal Key Scan Input Signal 1 IC FUNCTION DESCRIPTIONS Function Not Used Active Level
9. ISI ule oum QIc ielelme lt 13 12 1 17 2 1 ELECTRICAL PARTS LIST VR340 55 VR340 75 VR740 55 VR740 75 Pos A 12NC Description C430 CHIP CERAMIC CAP F Z 0 1UF 50V 1 1 451 452 453 454 456 457 458 459 466 467 468 469 470 471 472 473 475 100PF 50V 520 521 522 523 524 525 526 527 528 529 530 535 540 541 542 F Z 0 022UF 25V 561 701 703 704 710 C711 oy or O1 O O O 5 S A gt AIR CI II I DID C om gt gt 5 CI a a CF CC Fal CC a a a a a a Cal 90 9C 95 9 so ao dx 5 6 9 9 9 0 6 9 9 9 9 9 9 0 9 5 o 9 2 6 o 9 o 9 6 61 9 6 5 9 O 9 O
10. gt 5 I ala 2 11 o gt m F O lt 573 70 coz lt lt ajz 2 2 6 1 DECK PARTS LIST Description 9965 000 08522 KICK SPRING MK10 8562 9965 000 16665 C DRIVE LEVER SP MK12 8563 9965 000 16666 SLIDER SHAFT MK12 8564 9965 000 17205 GEAR MK12 8565 9965 000 17206 SENSOR GEAR MK12 B567 PINCH ARM B MK12 BT ARM MK12 9965 000 17207 9965 000 17207 HOLDER F 12 CAM RACK SPRING HI MK11 P S W CUT 1 6X4 0X0 5T REEL SP D2 MK12 REEL TU D2 MK12 TENSION LEVER ASSEMBLY MK12 BRAKE ARM TU MK12 BAND BRAKE TU MK12 TG POST MK11 AM HOLDER F ASSEMBLY MK12 CREW B TIGHT M2 6X6 PAN HEAD CREW S TIGHT 2 6 8 WASHER HEAD CREW SEMS M2 6X4 PAN HEAD CREW S TIGHT 2 6 8 WASHER HEAD CREW S TIGHT M3X6 BIND HEAD C HEAD SCREW MK9 CREW SEMS M2 6X5 PAN HEAD CREW S TIGHT 2 6 6 BIND HEAD B568 B569 B570 B571 B573 B574 B587 B590 B591 B592 B593 L105 L105 L115 L119 L132 L140 L145 1 3 1 1 1 6 0 6 L146 2 6 2 VR140 02 VR140 07 VR840 39 VR840 58
11. 194 037 Mms wsi QNS A sier 77 gre AS NODSAS AS N0OSXS 9 M095 5 ON ee SOSdlogcy 1 8 lt 904 04 ON 49078 VR501 031 M3M11 67 7059 L 9733 BLOCK 75XX JK755 _ JK754 JK753 000 E 058 ROSS 0052 9051 STE ROST 90536050 57511 59510 _ 1548 esp Z A3N CN505 1912 5 KEY 2 1 11 21 1 11 22 BHE274F01011 A Main CBA Parts Location Guide Ref No Position Ref No Position Ref No Position Ref No Position Ref No Position Ref No Position Ref No Position Ref No Position Ref No Position Ref No Position CAPACITORS CAPACITORS CAPACITORS CAPACITORS DIODES TRANSISTORS RESISTORS RESISTORS RESISTORS RESISTORS C001 F 3 C330 D 2 C459 B 3 C547 F 1 Q305 A 2 8071 F 1 R409 C 2 C003 F 3 C331 D 2 C461 B 3 C551 F 1 Q307 D 2 R073 F 1 R410 D 2 C004 G 3 C332 C 2 C462 C 3 C552 F 1 Q308 D 2 R076 F 1 R414 C005 G 2 C333 C 2 C463 C 3 C553 D 2 Q401 E 3 R077 F 1 R415 SW501 B 1 C006 G 2 C334 D 2 C464 C 3 C561 C 1 0402 C 3 8078 F 1 R416 R525 SW502 B 1 C007 F 2 C335 D 2 C465 C 3 C701 D 2 Q403 F 2 R253 C 3 R417 C008 G 2 C336 C 2 C466 C 3 C703 A 2 ICS Q405 D 3 R256 C 3 R418 SW505 C010 F 2 337 C 2 C467 B 2 C704 Q501 C 1 R257 C 3 R419 B 1 C011 F 2 C338 C 2 C468 B 2 C7
12. T 2 2 70 2 C 29 9 222 22 I 70 2 70 D m T 2 2 m m rm 70 2 0 9 2221 m m 0104022 463 464 465 466 467 470 471 472 I E 2 9 2 D NIN T NIN C I 9 9 2 9 9 222 2 22 I 501 502 503 504 505 506 70 2 70 2 511 516 517 518 8519 III III IN III III mimm 0 0 2 0 50 DD 0 0 0 0 0 0 0 00 m mmmmmmm 222 aya I CV 0 1 G1 a a G1 G1 alm 62 Go Go gt C 6 gt L VU m 1 17 7 ELECTRICAL PARTS LIST VR340 55 VR340 75 VR740 55 VR740 75 Pos 12 Description 1608 1608 R520 CHIP RES CHIP RES CHIP RES 1608 CHIP RES 1608 1 10W J 10K OHM 1 1 1 1 10W J 220K OHM 1 10W J
13. 2 2 3 3 3 3 3 3 3 1 11 14 Main 5 5 Schematic Diagram C 0 Comparison Chart of Models and Marks A MODEL MARK V8340 55 VR340 75 B MAIN Hi Fi BLOCK VR740 55 VR740 75 D SMD CONTINUE 1 4 5 5 P ONtSV MODE SP REC PLAY MODE 50 50 REC MODE t lea THE SAME VOLTAGE FOR INDICATES THATTHE VOLTAGE 1 5 BOTH PLAY 8 MODES IS NOT CONSISTENT HERE I IC BUS SDA oA 4 7 25V 22 C472 9C470 22 10V 0 01 I 469 1 V 3300P C468 1 4700 SERIAL lt DATA DECODER 0 0 1 928455 CONTINUE 2 3 220K MAIN 3 5 453 2 4 B9 lt gt Hi Fi A R R454 C477 ED 2 WE s A COM LE Ins 50 TUE 5 OUTPUT 25 1 67 B BIAS 10 1 CONTINUE MAIN 2 5 TU AUDIO R z TU AUDIO L CONTINUE
14. NIN U 2 lt gt gt 42 gt gt 2 CI gt gt 2 Q C mi a ol JA i c iz I 1 17 5 1 ELECTRICAL PARTS LIST VR340 55 VR340 75 VR740 55 VR740 75 Pos 12 Description 8012 CARBON RES 1 4VV J 390K OHM 1 1 013 014 014 1608 1 10W J 10K OHM 1608 1 10W J 100K OHM 555552525 I gt I I I2 2 2 2 22 2 m m m m gt BAIS _ _ gt gt I ox o 2 021 022 022 023 024 025 026 027 028 029 052 054 058 060 061 1608 1 10W J 22K OHM 1608 1 10W J 1 5K OHM CHIP RES 1608 1 10W J 390 OHM CHIP RES 1608 1 10W J 2 2K OHM 1608 1 10W J 1K OHM 1608 1 10W J 330 OHM 2 1608 1 10VV J 68K OHM 555555 8 28 88 2 2142 2 2 2 2 20 m m m gt RIRI gt IL 255 E D m 1608 1 10VV J 180 OHM CHIP RES 1608 1 10W J 820 OHM 1608 1 10VV J 22K OHM 91191191191 116 gt gt
15. 10454 LA72638M AUDIO SIGNAL PROCESS C453 C455 C457 22 10V 0 01 22 10v 9 289 e 10 8472 0 8473 L 1 50V 6 BK 39K 1 11 15 1 11 16 HE494SCM5 AFV Schematic Diagram C D SMD MODE SP REC AY MODE Comparison Chart of TT Te eee Models and Marks THE SAME VOLTAGE FOR INDICATES THAT THE VOLTAGE MODEL MARK BOTH PLAY amp REC MODES IS NOT CONSISTENT HERE VR34075 B V874075 D REC AUDIO SIGNAL AFV Schematic Diagram Parts Location Guide 1 Al B1 C11 C12 82 04 2 15 2 cie 2 C17 A 2 C19 C20 C21 A 1 C22 A 2 2 gt T C24 CONNECTORS CN1 DIODES oo 1 MAIN 701 5034476 06 88 A 1 M5034176 08 88 V3 cos IF SIGNAL PROCESS GND i2 2 TAMIL paw Pon 5 IIC BUS SCL 8 1 IIC BUS SDA 1 1 CRYSTAL OSCILLATORS X1 B 1 e ajA 1 11 17 1 11 18 HE494SCAFV Main CBA Top View CAUTION For continued protection against 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 F1001 is blown
16. FFC Cable Connector a Be careful to avoid a short circuit How to Remove Install Flat Pack IC 1 Removal With Hot Air Flat Pack IC Desoldering Machine 1 Prepare the hot air flat pack IC desoldering machine 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 when removing entire flat pack IC first apply soldering iron to center of the flat pack IC and heat up Then remove glue will be melted Fig S 1 6 4 Release the flat pack IC from the CBA using twee zers Fig S 1 6 Caution 1 Do not supply hot air to the chip parts around the flat pack IC for over 6 seconds because damage to the chip parts may occur Put masking tape around the flat pack IC to protect other parts from damage Fig S 1 2 2 The flat pack IC on the is affixed with glue so be careful not to break or damage the foil of each pin or the solder lands under the IC when removing it Hot air Flat Pack IC Desoldering Machine Masking Flat Pack IC Tape Tweezers Fig S 1 2 NOTE 1 With Soldering Iron 1 Using desoldering braid remove the solder from all pins of the 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 Flat Pack IC
17. PULLEY MK10 9965 000 16653 9965 000 16654 LOCK LEVER MK12 9965 000 16655 BAND BRAKE SP MK12 9965 000 17198 9965 000 17199 9965 000 16658 9965 000 16659 9965 000 16660 9965 000 16661 9965 000 17200 9965 000 05342 9965 000 08470 S BRAKE SPRING MK10 9965 000 17201 9965 000 08641 9965 000 05342 9965 000 17202 TU BRAKE SPRINGMKI2 9965 000 16662 REV BRAKE SPRING MKI2 9965 000 12373 TG POST ASSEMBLYMKI 9965 000 12230 9965 000 08504 ASSEMBLY MK10 996500012233 REV SPRING MK11 9965 000 16663 RACK ASSEMBLY MK12 9965 000 08519 MOTOR PULLEY 5 9965 000 17203 LOADING MOTOR M31E 1 R14 7352 8559 9965 000 17204 CLUTCH ASSEMBLY MK12 VR140 02 VR140 07 VR840 39 VR840 58 OADING ASSEMBLY 12 2 gt Io I9CIC lt lt 292 lt lt 9 m Q gt I gt 2 El ld gt 2 2 m lt TIN lt DINIDA gt zi v gt 2 m T CD gt CD gt 79 I gt 2 gt lt z 2 CD I gt U gt I lt C gt I m lt 2 51 m I m gt gt m r lt
18. VR740 75 Mode SP REC OUTPUT SELECT A IN L F TAN N A REC C N A PB C EET EEE EE ERE ER RER EE SERIAL IIC BUS SDA DATA IIC BUS SCL DECODER FROM TO A MUTE H SERVO SYSTEM CONTROL BLOCK Hi Fi SW 40 A MODE I A OUT L gt MOD A TO AOUTR AUDIO BLOCK CN253 Hi F A R 7 HFFFCOM 8 Hi Fi A L 9 Hi Fi AUDIO L HEAD CYLINDER ASSEMBLY 1 10 8 HE494BLH Power Supply Block Diagram Comparison Chart of Models amp Marks Model VR340 55 VR340 75 VR740 55 VR740 75 001 The voltage for parts hot circuit is measured using hot GND as a common terminal 0001 0004 001 A L003 1 LINE BRIDGE CAUTION FOR CONTINUED PROTECTION AGAINST FIRE HAZARD REPLACE ONLY WITH THE SAME TYPE T1 6AL 250V FUSE FILTER RECTIFIER CAUTION Fixed voltage or Auto voltage selectable p
19. BUS Control Data KEY 1 Key Scan Input Signal 1 KEY 2 Key Scan Input Signal 2 LD SW Position Detector LM FWD REV Loading Motor Control Signal MOD A Modulator Audio Output Signal N A PB Normal Audio Playback Normal Audio Recording OSCIN Clock Input for letter size OSCOUT Clock Output for letter size OSD V IN OSD Video Signal Input OSD V OUT OSD Video Signal Output OSDVcc OSDVcc OSDVss OSDVss P DOWN L Power Voltage Down Detector Signal HE274SNA Signal Name Function P OFF H Power Off at High P ON 5V 5V at Power On Signal P ON L Power On Signal at Low P80 C P80 C Terminal PG DELAY Video Head Switching Pulse Signal Adjusted Voltage POW SAF P ON Power Detection Input Signal REC SAF SW Recording Safety SW Detect With Record tab L With out Record tab H REMOCON IN Remote Control Sensor RESET System Reset Signal Reset L RESET 5V 5V at System Reset Signal RF SW Video Head Switching Pulse SIF Intermediate Frequency ST S Tape Start Position Detector Signal T REEL Take Up Reel Rotation Signal TIMER 5V 5V at Timer TU AUDIO Tuner Audio Input Signal TU VIDEO Tuner Video Input Signal TUN SW1 Tuner System Control Signal Output TUN SW2 Tuner System Control Signal Output V ENV Video Envelope Comparator Signal V IN Video
20. Video Head Amp Switching Pulse Not Used Head Amp Comparator Signal Video Head Switching Pulse Not Used HiFi Audio Head Switching Pulse Not Used Tuner System Control Signal Output Not Used Tuner System Control Signal Output Not Used Not Used Not Used Not Used Not Used Not Used Not Used Key Scan Input Signal 2 Deck Mode Position Detector Signal Tape Start Position Detector Signal Not Used Not Used Recording Safety SW Detect With Record tab L With out Record tab H Not Used Not Used Dummy V sync Output Remote Control Sensor Color Phase Rotary Changeover Slgnal 1 15 1 Not Used Hi Fi Tape Detection Signal Delayed Record Signal System Reset Signal Reset L Sub Clock Sub Clock HE274PIN Active Active Function Level Function Level VCC 66 Not Used Main Clock Power On Input p NG EON Signal at Low L Main Clock DRV LED Clock Input 68 OUT DATA IC H L Control Data Vss GND LED Not Used 69 OUT I Driver IC Chip HL LED Clock GND 70 OUT ere Driver IC H L Control Clock Clock Input PG for
21. PNG I gt gt RENE 5 Bi 20 NER 5 1 oj gt 1 e zz nm o 27 L 2 d 1 JE eles n WS rae 2 18501 VR501 E 9 E 8 gt 20502 u lt 5 5 21 8565 24 5 Ji e _ 2 52 515 N 5 SI 5 5 3 A H 25 3155 I a 5 C501 S M D BLOCK NO 752 NE 6545 J128 5 25 56 0057 0052 JK753 dedi beu r5 gt 527 C069 9053 JK754 _ 755 m 2 in 2 38 59510 54511 5 2 x 5 ELI 0 0 0 5 ds 8 564 C B m DEN 061 DTP507 SN NA a 2 ET ed A 5 25 25 58 5 Oe 2 C3 25 SND gt amp 5 R562 E 7972 CM505 in E 5509 gt 2 1 66562 EN 4 LI 1 11 19 1 11 20 BHE274F01011 A Main CBA Bottom View CAUTION BECAUSE CHASSIS GROUND IS PRESENT INTHE POWER For continued protection against fire hazard CAUTION SUPPLY CIRCUIT AN ISOLATION TRANSFORMER MUST BE USED replace only with the same type fuse Fixed voltage or Auto voltage selectable power supply circuit is used in this unit ALSO IN ORDER TO HAVE THE ABILITY TO INCREASE THE INPUT If Main Fuse F1 001 is blown check to see that all components in the power supply SLOWLY WHEN TROUBLESHOOTING
22. UNLOCK RELEASE grelt UNPLUG DESOLDER 1 1 Guide Holder A T DM3 2 S 1 2 1 Cassette Holder Assembly T DM4 3 2 Slider SP T DM5 L 1 4 2 Slider TU T DM5 L 2 5 4 Lock Lever I DM5 L 3 P 1 6 2 Cassette Plate I DM5 7 7 Cylinder Assembly DM1 DM6 Desolder 3 S 2 B B Loading Motor Assembly DM1 DM7 252 9 9 AG Head Assembly T DM1 DM7 S 4 10 2 Tape Guide Arm Assembly DM1 DM8 P 2 11 10 Door Opener T DM1 DM8 L 4 12 11 Pinch Arm T DM1 DM8 P 3 13 12 Arm Assembly T DM1 DM8 14 14 FE Head Assembly T DM1 DM9 5 5 15 15 Prism T DM1 DM9 S 6 16 2 15 Sensor Gear I DM1 DM15 17 2 Slider Shaft I DM10 L 5 18 17 Drive Lever SP I DM10 19 17 Drive Lever TU I DM10 S 7 P 4 20 Capstan Motor B DM2 DM11 3 S 8 Cap Belt 21 21 Clutch Assembly B DM2 DM12 C 1 22 22 Holder Assembly DM2 DM12 L 6 23 23 Gear B DM2 DM12 C 4 P 5 24 24 Gear B DM2 DM13 C 2 25 2 Mode Lever B DM2 DM13 C 3 L 8 26 22 Worm Holder DM2 DM13 S 9 L 9 L 10 27 26 Pulley Assembly B DM2 DM13 28 25 26 Cam Gear A B DM2 DM13 29 25 ldler Gear B
23. 5 XI 9 5 als TE TE a LI XI MI alel 74 5 2 2 3 512 61512 C C I gt 2 2 8248 1 lt a ki lt ala a C 9 lt 2 4 aS S CC C 2 C I1C lt lt lt lt C lt 2 12 lt lt gt C lt lt lt 2 lt zu zz lt lt lt lt lt lt lt lt ias z lt e lt 412 413 414 416 420 421 423 424 CERAMIC 1200 16 05 05 is gt gt 5 o 05 02 05 e 6 C1 gt gt Ola 5 gt meer 55 55 21 2 2 922522 lt lt lt 5 lt CI C 1C CIC C 0 gt gt gt gt S S 70 5 0170 9 TO
24. gt gt gt gt BIR gt gt gt gt ABEL RATING HE275AD ABEL RATING HE494PD LABEL RATING HE495AD DECK ASSEMBLY CZD012 VM1720 DECK ASSEMBLY CZD012 VM1760 SCREW P TIGHT 3X10 BIND HEAD SCREW P TIGHT M3X10 WASHER HEAD CREW B TIGHT M3X8 BIND HEAD TIGHT SCREW 3X8 BIND 822 502 14012 P TIGHT SCREW 3X8 BIND 965 000 13027 SCREW P TIGHT M3X8 BIND HEAD ACKING GIFT BOX CARTON HE274PD GIFT BOX CARTON HE275AD GIFT BOX CARTON HE494PD IFT BOX CARTON HE495AD TYROFOAM HB300UD TYROFOAM HB4P0UD TYROFOAM KID U23LC H79POUD NIT BAG E5500UD UNIT BAG V4010PA PAD HB200UD PAD HB4P0UD REMOTE CONTROL UNIT 364 006 REMOTE CONTROL UNIT 364 CRC006 REMOTE CONTROL UNIT 364 006 REMOTE CONTROL UNIT 364 006 RF CABLE LP PAL 960601 ACCESSORY BAG H3600UD T 0 03 gt gt N L021 3 gt NIN CD gt L04 L09 gt XIX gt lt gt 2 lt gt lt XI Mm CO 62 NS MS 965 000 13675 965 000 17331 822 322 10137 EE EET Jeff EEE ET ETT 4 1 19 1 DECK MECHANISM SECTION VIDEO CASSETTE RECORDER Sec 2 Deck Mechanism Section Standard Maintenance Mechanism Alignment Procedures Disassembly Assembly of Mechanism Deck Exploded Views Deck Part
25. Desoldering Braid Soldering Iron Fig S 1 3 2 Lift each lead of the flat pack IC upward one by one using a sharp pin or wire to which solder will not adhere iron wire When heating the pins use fine tip soldering iron or hot air desoldering machine Fig S 1 4 Soldering Iron 3 Bottom of the flat pack IC is fixed with glue to the CBA when removing entire flat pack IG first apply soldering iron to center of the flat pack IC and heat up Then remove glue will be melted Fig S 1 6 4 Release the flat pack IC from the CBA using twee zers Fig S 1 6 With Iron Wire 1 Using desoldering braid remove the solder from all pins of the 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 5 3 While heating the pins using a fine tip soldering iron or hot air blower pull up the wire as the solder melts so as to lift the IC leads from the CBA contact pads as shown in Fig S 1 5 1 3 2 4 of the flat is fixed with glue to the CBA when removing entire flat pack IG first apply soldering iron to center of the flat pack IC and heat up Then remove glue will be melted Fig S 1 6 5 Release the flat pack IC from the CBA using twee zers Fig S 1 6 Note When using a soldering iron care must be taken to ensure
26. To Monitor for CTL AMP Output AMPVcc A D Converter Power Input Standard Voltage Input Not Used Notes Abbreviation for Active Level PWM Pulse Wide Modulation A D Analog Digital Converter 1 15 3 HE274PIN LEAD IDENTIFICATIONS 2SC1815 BL TPE2 A ey BM oc 20 25 1815 2 2SC1815 GR TPE2 66 GR KTC3199 2SC2120 Y TPE2 V 68 8L 2SC2785 J H F K KTC3203 Y KRA103M 2SC1815 BL TPE2 KRC103M 2SA1015 GR TPE2 ECB ECB LA71586M QSZAAORMB145 80 51 LTV 817 B C F CAT24WC02JI EL817 A B C BR24C02F W 81 50 A C K E 100 T e OI 31 1 30 LA72638M RN1511 TE85R KTC3879Y RTK 60 41 FMGAA T148 KTC3875Y RTK EEE oe C1 C2 S 61 I 40 B1 E B2 B E 80 c 1 20 204 6 12 2SK3566 MID 32A22 PT 6958 FN TP 28 15 Note C 1 14 A Anode K Cathode E E Emitter C Collector B Base R Reference GDS S Source G Gate D Drain 1 16 1 HE274LE PRODUCT SAFETY NOTE Products marked with a have special characteristics important to safety Before replacing any of these
27. 5 6 6 Identification of parts to be removed unhooked unlocked released unplugged unclamped or desoldered P Spring W Washer C Cut Washer S Screw Unhook Unlock Release Unplug or Desolder e g 2 L 2 two Locking Tabs L 2 7 Adjustment Information for Installation Refer to Deck Exploded Views for lubrication 2 4 2 U27NPCASIADA Top View 40 29 30 16 39 38 Fig DM1 Bottom View Fig DM2 2 4 3 U27NPCASIADA First while pushing the locking tab as shown at right slide and pull up the right side on 2 to release Pin A and Pin B from the slots A Lead with E se C GE Red Stripe View Then remove Pin and Pin D on 2 from the slots B as shown View for A Locking tab U27NPCASIADA 2 4 4 Desolder from bottom Lead with White Stripe View for A
28. AUDIO SELECT button 12 STANDBY ON button 13 STATUS button 14 CLEAR button 15 ALT CH button 16 STILL button 17 gt gt J F FWD button 18 STOP button 19 VOL ume buttons 20 TV button 21 TIME SEARCH button 22 SPEED SYSTEM button 23 SLOW button Doesn t work on this model as the SYSTEM button r To insert the batteries Install two R6 batteries matching the polarity compartment indicated inside the battery e O You can use this remote control to operate some PHILIPS TVs Press VCR before pressing VCR feature buttons press TV before pressing TV feature buttons if you have a PHILIPS TV 1 6 4 On Battery Replacement Do not mix old and new batteries Also never mix alkaline batteries with manganese batteries HE274IB Signal Name SIGNAL NAME ABBREVIATIONS Function 4 43MHz 4 43MHz Clock A COM Audio Head Common A IN Audio Signal Input A MODE Hi Fi Tape Detection Signal A MUTE H Audio Mute Control Signal Mute H A OUT Audio Signal Output A PB REC Normal Audio Play Back Record Signal AE H Audio Erase Head AFC Automatic Frequency Control Signal AL 12V Always 12V with AC Plug Connected AL 5V Always 5V with AC Plug Connected AMPC CTL AMP Connected Terminal AMPVcc AMPVcc
29. ER 028 0 85 MONO EN z 1 58 HIFI 025 0 85 1 08 105 085 025 STOP PLAY RS FS PLAY STILL PLAY STOP gt lt gt lt gt lt gt gt lt gt lt PE gt POWER OFF 274 1 14 2 2 STOP A gt FF gt STOP A gt REW gt STOP A gt REC gt PAUSE gt PAUSE or REC gt STOP A gt EJECT FF STOP A 4 STOP LD FWD FF LD FWD 2 5S LD FWD 0 5S LD STOP A 4 REW STOP LD REV 0 2S LD FWD REW LD FWD 2 55 LD FWD 0 55 LD REV STOP A REC 4 PAUSE LD FWD LD FWD REC 2 55 Short REV LD REV LD FWD REC PAUSE REC or PAUSE REC STOP 5 CASS UNLD STS LD FWD LD REV STOP A LD REV 1 05 0 25 LD FWD 0 55 0 25 LD REV 0 55 0 25 0 55 4 END S EJECT 81 LM FWD M REV 7 C DRIVE 78 C F R DRUM ROTATION 83 EE 33 D REC H DISPLAY SM STOP FF gt 5 REW gt AL AU SM STOP AL SS R PAUSE RS AU SM IL CD T n 0 15 STOP ON Fig 2 274 1 14 3 VR740 55 75
30. L562 L701 L702 I 1 L704 C 1 TRANSISTORS Q504 L 4 Q505 L 4 RESISTORS J30 2 912 2 8534 3 8535 3 8536 TEST POINTS R537 J 3 TP505 K 4 G 3 G 3 2 bol bowl amp 5 1 11 7 MAIN 3 5 Schematic Diagram Parts Location Guide Ref No Ref No Ref No Ref No Position CAPACITORS CAPACITORS COILS RESISTORS C253 342 Q 4 L306 R323 Q 1 c255 cs44 P 4 L308 R324 0 2 256 M2 0345 P 4 L403 R325 Q 2 N N N C301 C346 P 4 TRANSISTORS R327 Q 2 C C c302 C2 cas48 6 4 0301 8328 0 3 c303 02 cs49 C304 C350 0 4 0 4 0 4 0 4 C 2 C 2 0 1 M 2 M 2 M 2 M 2 M 2 M 2 M 2 M 1 M 1 M 1 0 2 0 2 0 4 N 4 N 4 N 4 N 4 0 4 Q302 Q303 Q304 R332 Q305 R334 Q307 R335 R329 R330 0 2 P 1 0 4 P 4 P 4 0 4 0 1 C 2 C 2 M 2 M 2 M 2 M 2 M 2 M 2 M 2 M 2 M 2 C305 C351 C306 C307 C308 C309 C310 C311 C312 C313 C314 C315 C317 C318 C319 C411 C320 C412 c3231 02 C352 C355 C361 C362 C401 C403 C404 C405 C406 C407 C409 C410 Q308 R336 Q401 R340 Q402 R344 Q403 R372 Q405 R401 RESISTORS R402 R253 R403 R256 R404 R257 R405 R302 R406 R303 R408 R304 R409 R305 R410 R306 R414 R307 R415 R308 R416 R309 R417 R310 R418 C323 C414 C324 C416 C326 C420 C327 C421 C328 C423 C330 C424 C331 C430 C332 C333 C334 C335 C336 C337 L251 C338 Q L301 c339 1302 1303
31. RF OUT terminal 20 VIDEO IN jack 21 VIDEO OUT jack OND of Co k You can use this remote control to operate some PHILIPS TVs Press VCR before pressing VCR feature buttons press TV before pressing TV feature buttons if you have a PHILIPS TV OONDOBRWN EJECT button MENU button NUMBER buttons MEMORY button f A PLAY button RECORD OTR button K lt lt 4 REW button MUTE button CH annel buttons 10 VCR button 11 STANDBY ON button To insert the batteries 12 STATUS button 13 CLEAR button 14 ALT CH button 15 STILL button 16 P gt gt FFWD button 17 STOP button 18 buttons 19 button 20 SPEED SYSTEM button Install two R6 batteries matching the polarity indicated inside the battery compartment On Battery Replacement Do not mix old and new batteries Also never mix alkaline batteries with manganese batteries 1 6 1 HE274IB VR340 75 1 lt Front Panel lt 1 STANDBY ON button Cassette compartment 4 STOP EJECT button gt gt FWD button P gt PLAY button K lt REW button RECORD button Display window See below CHANNEL buttons 10 PWR Power indicator 11 TAPE IN indicator 12 REC indicator 13 14
32. 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 to fail BECAUSE A HOT CHASSIS GROUND IS PRESENT IN THE POWER SUPPLY CIRCUIT AN ISOLATION TRANSFORMER MUST BE USED ALSO IN ORDER HAVE THE ABILITY TO INCREASE THE INPUT SLOWLY WHEN TROUBLESHOOTING THIS TYPE POWER SUPPLY CIRCUIT A VARIABLE ISOLATION TRANSFORMER IS REQUIRED NOTE The voltage for parts in hot circuit is measured using hot GND as a common terminal Sensor CBA Top View BHB300F0101 I BHB300F01014 A BHB300F0101 4B BHB300F01014 B 1 BLUE BROWN T T 5 5 TX 4 Sams 2 0 gt 1 0 2 Cio p Zu 2 25 E rene 5 Ti SAL 250 n 1 124 Stop _ 7719 2171 2 1 ES des gt ETE 513 Ds 22 sadol lt B 9 gt 3 25 7 6356 si 5 5 I pr C 45 XI 3 lt 299 955 3 8 gt 8 z ot as ale I B Zu coos 0003 7527 Fam I PRAN pen XII Laz 5 gt gt 7 NU case LI 930481 fpe 0m Loos NE 7 Sle 1 3 dt HIHI OUT R 818 0 8 lt 2 FLY cave 2 gt 5 it HIEL IN L X D C
33. gt 79 2 gt a o 85 4464 lt F I gt m Jlm lt ol lr zEIx Alo m lt Zim z m 2 lt UJ CD 2 lt CD U D Z 0 UJ CD olz gt om 2 gt 2 D gt I gt 2 A ASSEMBLY 4 MK12 gt LI mls z U DI Ox 2 CD 79 lt 9 5 G m lt 2 00 00 WU U U U U UU C I C2I PMD C1 gt 2 gt O m gt 2 MK12 8 E gt En gt 59 40 2 de C I 2 LC 2 Ul m gt Dimm z 2226 gt BAD 12 EEL WASHER MK9 5 2 1 0 5 2 Jj z iolojo c I gt gt m TD 2 2 2 00 U U U i Sr Sr Or or OM a I 3 71 zm om m uz gt DIN z sz 2
34. gt gt gt 50 9 9 5 9 906 0000210 22 2 20 20 20 20 2 Oo SIASI gt 0 O I r z r I lt lt lt lt 0 lt CHIP 1608 1 10VV J 1K OHM 1608 1 10W J 4 7K OHM 1608 1 10W J 12K OHM 1608 1 10W J 47K OHM 1608 1 10W J 2 7K OHM 1608 1 10W J 12K OHM 1608 1 10W J 10K OHM 1608 1 10W J 18K OHM 1608 1 10W J 22K OHM 1608 1 10W J 100K OHM 1608 1 10W J 10K OHM 1608 1 10W J 820 OHM 1608 1 10W J 1K OHM 1608 1 10W J 820 OHM 1608 1 10W J 1K OHM 1608 1 10W J 390 OHM 1608 1 10W J 390 OHM 1608 1 10W J 2 7K OHM 1608 1 10W J 820 OHM 1608 1 10W J 560 OHM 1608 1 10W J 100 OHM 1608 1 10W J 1 5K OHM 1608 1 10W J 4 7K OHM 1608 1 10W J 820 OHM 1608 1 10W J 150K OHM 22515515 mm SS 2 Bld eo ool bs m m m BIDS MI gt lt lt 70 2 T 2 2 D m 9 9 NIN 306 307 308 309 310 311 312 313 314 315 316 T 221 m m rm 0104 d D D NIN 9 NI
35. 1 10 2 HE274BLS Video Block Diagram NOTE FOR WIRE CONNECTORS 1 PREFIX SYMBOL MEANS CONNECTOR TEST POINT INFORMATION O INDICATES A TEST POINT WITH A JUMPER WIRE ACROSS HOLE IN THE Comparison Chart of Models amp Marks SMD DISCONNECT AND RECONNECT USED TO INDICATE TEST POINT WITH COMPONENT LEAD FOIL SIDE 2 PREFIX SYMBOL CL MEANS WIRE SOLDER USED TO INDICATE TEST POINT WITH NO TEST Model REC VIDEO SIGNAL lt J PB VIDEO SIGNAL MODE SP REC HOLES OF THE PCB USED TO INDICATE A TEST POINT WITH A TEST PIN WIRE IS SOLDERED DIRECTLY VR340 55 TP751 eic501 OSD MAIN CBA VR340 75 vor VR740 55 9
36. 5 Z gt n 5 R2T la 5 8304 9307 18 gt YEE gt S 5 9001 Sop scoot m XO gt gt gt Roos P pors coos 2 2 lt 22 g n z e 2 ALL 32V 2 ale 1 gt gt 9 19 poo M 552 55 2 2 gt LI PR E co12 Los omm MAI zz zm El N 2 C 3 SE 2 2 gt gt 3 C862 lt 2V MT CBUS CLK1 zs TEE E D 025 eee s SNE 3923 39 2 E 5 5 1908 gt m 9 1052 e ISYSCON TIMER 1ICBUS DATAI C856 A d SERVO BLOCK Ly IL 1525 ee H A COMP us 59 NO 5 F re ND 2114 0515 8 jsos sies n CIS re Id 2 oe ER SC 1 INIPG Deley 1935 gt t ee Dos A pu gt 3n 8524 5 i 3 A rec 2 5 8 5 gt mle Sree J37 S em gt 5 gt gt E Qr 3 3 0070 6516520 ce Posta 2 H A SW KE lt 4 C m 74 SR RF SW 32 gt gt N m 0 n S a ee 5 1 sa is C ROTA T En lt S S
37. 5 00V 5 00V 0 00V 0 25V 0 00V 1 06V 1 50V 1 21V 0 66V 1 05V 0 91V 1 99V 2 60V 2 17V 1 51 1 98 1 80V 3 20V 3 75V 3 40V 0 26V 0 65V 0 44V 4 51V 5 00V 5 00V 2 61V 3 19V 2 97V S L Note gt RS Loading FWD LM FWD LM REV L RS gt EJ Loading REV LM FWD L LM REV Stop A Loading Stop B Unloading Note Note Symbol Loading Status Eject Eject REW Reel REW Reel Stop B Stop B Brake Cancel Brake Cancel FF REW FF REW Stop M FF REW Stop M FF REW Stop A Stop A Play REC Play REC Still Slow Still Slow RS REW Search RS REW Search 1 14 1 HE274TI VR340 55 75 1 1 EJECT POWER OFF gt CASSETTE IN POWER ON gt STOP B gt STOP A gt PLAY gt RS gt FS gt PLAY gt STILL gt PLAY gt STOP A x z 88 BB lt lt Ju I Li z z m bu _ a L a 62685 lt Y Y Y Y Y 5 22 8 3 8 2 p 89 MI 8 E _ z LL z 2 2 2 2 2 z 5 d a o Na d OG d a PIN NO lt gt oa C 2 oa
38. AE HIFE H 2 A COM 3 EE A PB REC 4 CTL 5 CONTROL HEAD H le A PB REC CTL LOADING MOTOR CYLINDER ASSEMBLY C CTL CL501 FE H CAPSTAN MOTOR FE H GND CL502 AL 12V AL 5V C FG C F R CAPSTAN MOTOR C CONT GND LM FWD REV D CONT D PFG GND AL 12V 2 AL 15V CL253 V R 1 V COM V L 1 V L 2 V COM V R 2 Hi Fi A L Hi Fi AUDIO R HEAD Hi Fi COM IC I Hi Fi A R MAIN CBA BHE274F01011A CN701 ANT IN ANT OUT AC CORD CN1 TU AUDIO SIF GND TU AUDIO R TU AUDIO L AFV CBA BHC400F01091 AL 5V AL 5V IIC BUS SCL IIC BUS SDA CL509 POWER SW1 CBA GND BHE274F01011C STOP EJECT SW2 CBA GND BHE274F01011E 1 13 2 HE274WI SYSTEM CONTROL TIMING CHARTS Mode SW L0 5VV LD SW Position detection A D Input voltage Limit Symbol Calculated voltage 3 76V 4 50V 4 12V 4 51V
39. AMPVREF OUT V Ref for CTL AMP AMPVREFIn V Ref for CTL AMP AMPVss AMPVss AVcc A D Converter Power Input Standard Voltage Input Capstan Motor Control Signal C L Capstan Motor FWD REV Control Signal FWD L REV H C FG Capstan Motor Rotation Detection Pulse C ROTA Color Phase Rotary Changeover Slgnal C SYNC Composite Synchronized Pulse CLKSEL Clock Select GND COLOR IN SECAM or MESECAM Chroma Video Input Signal at Super Impose CTL Playback Record Control Signal CTL Playback Record Control Signal CTLAMPout To Monitor for CTL AMP Output D CONT Drum Motor Control Signal 1 7 1 Signal Name Function D PFG Phase Frequency D REC H Delayed Record Signal D V SYNC Dummy V sync Output DRV CLK LED Clock Driver IC Control Clock DRV DATA LED Clock Driver IC Control Data DRV STB eee Driver IC Chip Select END S Tape End Position Detect Signal FE H GND Ground for Full Erase Head Frimew STE Frequency Characins aM 4 43MHz Clock Input H A COMP Head Amp Comparator Signal H A SW Video Head Amp Switching Pulse Hi Fi A Hi Fi Audio Head Hi Fi COM Hi Fi Audio Head Common HiFi H SW HiFi Audio Head Switching Pulse HLF Terminal Sicer BUS SCL BUS Control Clock BUS SDA
40. Alcohol 2 After cleaning the parts do all DECK ADJUSTMENTS 3 For the reference numbers listed above refer to Deck Exploded Views B73 Recording Model only 2 1 1 U27MEN Cleaning Cleaning of Video Head Clean the head with head cleaning stick or chamois cloth Procedure 1 Remove the top cabinet 2 Put on a glove thin type to avoid touching the upper and lower drum with your bare hand 3 Put a few drops of 90 Isopropyl alcohol on the head cleaning stick or on the chamois cloth and by slightly pressing it against the head tip turn the upper drum to the right and to the left Notes 1 The video head surface is made of very 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 chamois cloth Upper Cylinder Video Head Cleaning Stick Cleaning of Audio Control Head Clean the head with a cotton swab Procedure 1 Remove the top cabinet 2 Dip the cotton swab in 90 isopropyl alcohol and clean the audio control head Be careful not to damage the upper drum and other tape running parts Notes 1 Avoid cleaning the audio control head vertically 2 Wait for the cleaned part to dry thoroughly before operating the unit or damage may occur U27MEN SERVICE FIXTURE AND TOOLS 4 1 1 J 1 2 5 Alignment Tape Part No FL6A Adj
41. DM1 DM14 30 29 Idler Arm B DM1 DM14 L 11 31 25 B DM2 DM14 P 6 Loading Arm SP Refer to Alignment 132 25 Assembly Sec Pg 2 4 9 2 4 1 U27NPCASIADA 32 Loading Arm TU Assembly DM2 DM14 REMOVE UNHOOK UNLOCK RELEASE UNPLUG DESOLDER ADJUSTMENT CONDITION Refer to Alignment Sec Pg 2 4 9 2 25 M Brake TU Assembly DM1 DM15 P 7 Brake Belt 2 25 M Brake SP Assembly DM1 DM15 8 35 Tension Lever Assembly DM1 DM15 36 T Lever Holder DM15 34 Reel TU D2 DM1 DM15 38 M Gear DM1 DM15 36 Reel SP D2 DM1 DM15 32 36 Moving Guide S Preparation ala a aya DM1 DM16 33 Moving Guide T Preparation DM1 DM16 19 TG Post Assembly DM1 DM16 28 Rack Assembly DM17 Refer to Alignment Sec Pg 2 4 9 44 F Door Opener DM17 46 Cleaner Assembly DM1 DM6 46 CL Post 3 41 2 4 6 1 Follow steps in sequence When reassembling follow the steps in reverse order These numbers are also used as identification location No of parts in the figures 2 Indicates the part to start disassembling with in order to disassemble the part in column 1 3 Name of the part 5 Figure Number 2 3 4 Location of the part T Top B Bottom R Right L Left
42. Deck Assembly Jack CBA and Main CBA up 2 When reassembling solder wire jumpers as shown in Fig 5 3 Before installing the Deck Assembly be sure to place the pin of LD SW on Main CBA as shown in Fig 6 Then install the Deck Assembly while align ing the hole of Cam Gear with the pin of LD SW the shaft of Cam Gear with the hole of LD SW as shown in Fig 6 1 Top Case REMOVAL ID LOC PART Fi REMOVE UNHOOK No He UNLOCK RELEASE Note UNPLUG DESOLDER 1 3 5 1 Front n bid _ 2 Assembly 2 3 L 1 4 L 2 VCR 5 S 2 3 Chassis 3 1 Unit 2 S 3 Mark C D Deck 3 S 4 2 W 1 4 Assembly Desolder 2 3 5 Main CBA 4 5 l 1 2 3 4 5 1 8 1 HE274DC gt Lead with blue stripe Assembly From FE Head Desolder Cylinder Assembly BOTTOM VIEW Lead connections of Deck Assembly and Main CBA From Lead with blue stripe 5 Main CB 5 4 From ACE Head Assembly From Capstan Motor Printing side Assembly Assembly Desolder 2 Front Assembly Chassis Unit HE274DC 1 8 2 C2 5 Main SS 4 Deck Assembly Cam Gear N Hole Shaft Hole LD SW _ Pin St 5 Main CBA Fig 5 HE274DC ELECTRICAL ADJUSTMENT INSTRUCTIONS General Note CBA is an abbreviation for Circuit Board
43. Q404 AL 5V DECODER PB ON M Y e SWITCHING i I Q403 D REC OFF L CL501 IC 805 SDA C AL 5V 9 gt lt 2 IIC BUS SCL ERASE 1 FE HGND Q405 A MUTE H SERVO SYSTEM HEAD Y i M CONTROL BLOCK L i 3 D REC H 1 2 M 2 2 0 9 _ HE274BLA Hi Fi Audio Block Diagram C D SMD A IN R NOTE FOR WIRE CONNECTORS 1 PREFIX SYMBOL CN MEANS CONNECTOR CAN DISCONNECT AND RECONNECT 2 PREFIX SYMBOL CL MEANS WIRE SOLDER HOLES OF THE PCB WIRE IS SOLDERED DIRECTLY TEST POINT INFORMATION INDICATES A TEST POINT WITH A JUMPER WIRE ACROSS A HOLE IN THE PCB gt USED TO INDICATE A TEST POINT WITH A COMPONENT LEAD ON FOIL SIDE USED TO INDICATE A TEST POINT WITH NO TEST PIN USED TO INDICATE TEST POINT WITH A TEST PIN MAIN CBA 451 MTS SAP Hi Fi AUDIO PROCESS Hi Fi HEAD TU AUDIO R AUDIO BLOCK AUN TU AUDIO L 4 PB AUDIO SIGNAL REC AUDIO SIGNAL Comparison Chart of Models amp Marks VR340 55 VR340 75 VR740 55
44. Signal Input V OUT Video Signal Output Vcc Vcc VIDEO Video Signal Vss Vss GND X IN Main Clock Input X OUT Main Clock Input XC IN Sub Clock XC OUT Sub Clock 1 7 2 HE274SNA CABINET DISASSEMBLY INSTRUCTIONS Comparison Chart of Models and Marks Model Mark VR340 55 VR340 75 B VR740 55 C VR740 75 D 1 Disassembly Flowchart This flowchart indicates the disassembly steps to gain access to item s to be serviced When reassembling follow the steps in reverse order Bend route and dress the cables as they were originally 1 Top Case 2 Front Assembly 3 VCR Chassis Unit 4 Deck Assembly 5 Main CBA 2 Disassembly Method 1 Identification location No of parts in the figures 2 Name of the part 3 Figure Number for reference 4 Identification of parts to be removed unhooked unlocked released unplugged unclamped or desoldered P Spring L Locking Tab S Screw CN Connector Unhook Unlock Release Unplug or Desolder e g 2 S 2 two Screws S 2 2 L 2 two Locking Tabs L 2 5 Refer to Reference Notes 1 2 3 4 Reference Notes CAUTION Locking Tabs L 1 and L 2 are fragile Be careful not to break them 1 Remove five Screws S 2 two Screws S 3 and Screw S 4 Then slowly lift the VCR Chassis Unit
45. THIS TYPE POWER SUPPLY circuit are not defective before you connect the AC plug to the AC power supply CIRCUIT A VARIABLE ISOLATION TRANSFORMER IS REQUIRED NOTE Otherwise it may cause some components in the power supply circuit to fail The voltage for parts hot circuit is measured using hot GND as a common terminal NOTE Red letters indicate additional parts on the copper side UDIO BLOGK 8402 NO 4XX 5 OG 5172 gt 5 ete 8 SPT GAL 250 ay 000 1 5 26307 E g 5 TI lt a Esse ER 3 I 5 2 R pus 4 EJ por Y LAL 5 3 EI fasion 0003 gt gt 17717741 9 E 2 mek R316 RS t m L003 Stara 8817 ma ih Ej T 285 8 3 E 1 L ye SN z RJ i me 01 HOT m 0 04 gt 4 2100 12 m E ESTE 55 ce N 4 R332 701 23 2 R006 amp _ ole 265 R003 3 D018 kd E 2028 55609 d E s re 0327 55372 E II y 2628 C330 gt TP301 1 3 8004 gt 46 gt v 3 0008 2 E mc Jie Tuts 0 015 COLD 5 555 gt OG 2 d X801 a gis B plo 4 C 535 pri
46. components read carefully the product safety notice in this service manual Don t degrade the safety of the product through improper servicing NOTES Parts that not assigned part numbers are not available Tolerance of Capacitors and Resistors are noted with the following symbols 0 25 D 40 5 L 1 G 296 5 10 20 30 7 80 20 1 ELECTRICAL PARTS LIST VR340 55 VR340 75 VR740 55 VR740 75 Pos A 12NC Description MCV CBA Consists of the following MAIN CBA MCV A 1 1 11 1 SW1CBAMCV C Tifi JSWeCBAMCVE fSENSOROBA 1 1 1 1 MAIN CBA MCV A 2B8 9965 000 08566 LED F H3700UD 11 1 1 1 1 1 JACK BOARD 4 1 1 CAPACITORS C001 9965 000 06521 METALLIZED FILM CAP 0 068UF 250V K 003 004 005 006 007 008 010 011 012 017 020 021 025 026 051 053 9965 000 06522 SAFETY CAP 2200PF 250V ELECTROLYTIC CAP 22UF 400V M CERAMIC CAP BK 0 01UF 500V CERAMIC CAP SLK 120PF 1KV CERAMIC CAP AX BK 1000PF 50V CERAMIC CAP AX XK 5600PF 16V FILM CAP P 0 022UF 50V J ELECTROLYTIC CAP 10UF 16V H7 ELECTROLYTIC CAP 10UF 50V H7 ELECTROLYTIC CAP 470UF 16V ELECTROLYTIC CAP 1000UF 16V ELECTROLYTIC CAP 470UF 10V CERAMIC CAP AX 5600PF 16V ELECTROLYTIC CAP 47UF 16V ELECTROLYTIC CAP 47UF 16V H7 ELECTROLYTIC CAP 220UF 6 3V CERAMIC
47. conductors are to be placed Because the static electricity charge on cloth ing will not escape through the body grounding band be careful to avoid contacting semi conductors with your clothing lt Incorrect gt Grounding Band 1MQ Conductive Sheet or Copper Plate lt Correct gt 1 3 3 NOTE 1 FUNCTION INDICATOR SYMBOLS Note The following symbols will appear on the indicator panel to indicate the current mode or operation of the VCR On screen modes will also be momentarily displayed on the tv screen when you press the operation buttons Display panel LED Light on LED Light off LED MODE INDICATOR ACTIVE CASSETTE IN ON CASSETTE OUT OFF CLOCK ON POWER ON ON REC ON REC PAUSE Blinks at 0 8Hz interval T REC OTR ON T REC OFF T REC incomplete Blinks at 0 8Hz interval When reel and capstan mechanism is not Blinks at 0 8Hz interval functioning correctly When tape loading mechanism is not func Blinks at 0 8Hz interval tioning correctly When cassette loading mechanism is not Blinks at 0 8Hz interval functioning correctly When the drum is not working properly Blinks at 0 8Hz interval P ON Power safety detection Blinks at 0 8Hz interval 5 5 condition All modes Blinks at 0 8Hz interval 1 4 1 HE274FIS PREPARATION FOR SERVICING How to Enter the Service Mode About Optical Sensors Caution An optical sensor syste
48. letter size 2 71 OUT BUS BUS Control Clock Output for Clock letter Size Not Used 72 Ty FOBUS Control LP SDA aa 4 43MHz Clock 73 OUT P OFF Power Off at L LI High nput 74 Not Used OSDVss 75 Not Used Capstan Motor OSD Video 76 OUT PWM Signal Input CONT Control Signal D Drum Motor PO 7 OUT CONT Control Signal EAN OSD Video Signal Output EG OSDVcc 78 OUT C F R a H L REV H LPF Connected Terminal Slicer 79 Not Used Not Used _ Take Reel 80 T REEL Rotation Signal PULSE SECAM or a MESECAM H L Chroma Video beading Motor HU Input Signal at REV Super Impose 82 Not Used Not Used Audio Mute Not Used 3 Control 83 OUT Signal Mute H Composite Synchronized Pulse Not Used z Not Used 84 CTL Frequency FF Characteristics L Not Used REW L Switching Signal Not Used FF REW L Not Used 85 N U Not Used Voltage Mot ussu 86 DOWN Down Detector L Not Used L Signal Not Used 1 15 2 HE274PIN Function Capstan Motor Rotation Detection Pulse Active Level AMPVss Not Used Drum Motor Phase Frequency Generator V Ref for CTL AMP V Ref for CTL AMP P80 C Terminal Playback Record Control Signal Playback Record Control Signal CTL AMP Connected Terminal
49. line number 1 goes to area B1 5 All resistance values are indicated in ohms 103 106 6 Resistor wattages 1 4W 1 6W unless other wise specified 7 All capacitance values are indicated in uF P 10 uF 8 All voltages are DC voltages unless otherwise specified 9 Voltage indications for PLAY and REC modes on the schematics are as shown below PLAY mode 0 Os Det Pd REC mode DI Indicates that the voltage Unit Volt The same voltage m NEN both PLAY amp REC modes is not consistent here Transistor or Digital Transistor 2 9 8 lt Schematic Diagram Symbols gt Top View Top View Digital Transistor NPN Transistor PNP Transistor ECB ECB GO Top View Top View gt PNP Digital NPN Digital Transistor Transistor GO ECB ECB 1 11 1 5C 08 Main 1 5 Schematic Diagram Parts Location Guide Ref No Ref No Ref No CAPACITORS CAPACITORS C501 B 1 C858 C503 CA C859 C506 C 1 C862 C508 C510 C511 C512 C513 C514 C515 C516 C517 C518 C519 C520 C521 C522 C523 C524 C525 C526 C527 C528 B C529 C C530 D 1 SWITCHES C535 E 2 SW506 D 1 545 2 VARIABLE RESISTORS 542 2 B 1 C547 D 2 CRYSTAL OSCILLATORS C553 D 3 D 2 C851 F 3 D 2 C852 F 3 MISCELLANEOUS C853 D 4 B 2 C854 E 4 TEST POINTS C855 E A 2 C856 B C 1 D D D DIODES D501 D502 E 2 E 2 E 2 E 2 E 2 E 2 E 2 E 4 E 4 B 4 A 3 A 2 A 2 A 5
50. ol o 3 5 6722 5 lt 5 55 5 50221 458215 Bs 1 INE 5 5 5 6 28 7A 5 215 6723 EB SK 595525 IICBUS cest ES 9159 m 52 bd C859 PN ele nl E an 7158 spe BE m 5 SYSCON TIMER 5 X III VA Es SERVO BLOCK 240 J114 GND af es NO 5XX 6XX gt 7 JE 2 SC 1 IN PG Del ey I TIMER 5 2 29 elg 780 lt Er m 499 ESS BASIS Sho e n aso L 38 8 gt 5 I HEMA sS mI 5 gt Oe gt N 18 RNS ajal ede 2 90 2 Ne E 0022 2 5 2 FE 85 d 5 5 4 35 1 C 2 Bae ees pE u 5 7 5 5 0070 5 4 1 0 H A SW gt BE uM m EL 15 a 2 9 I 8076 g TP5 2 gt gt 2 ol 5 A A 5 5 8 2 eS Si R077 0058 2 n J34 SJ ata 5 wo 915 RF 5W 5 x eg RF SW E 8 ni P DOWN L 1907 Spa E LIE e 1 8 5 5 E tla 2 NG lt C ROTA o 53 SRG wi 5 gt 896274601 01 x Bs mr i 2 lt 5 C 555 gt 55 V 5 afm EI Q 8 S laine elo s ale R056 EG o wo
51. 0 9 2 9 0 70 9 5 9 5 0 DI 9 70 TI UIT Tol aA WIlulp u u olulp 0 0 U TM 1 gt i W O amp mo a mie CIE lt 1222 bari kad gt C Bs os gt SIE SIG 318 2 3 813 28 Jll 09 lt DNI 9 C lt IC Ne Sl 8 9 S 0 mm imme lt lt lt lt lt S 2 2 lt 2 5 m MI Aslag SS 2 m Aim m m S 21 2 lt gt lt gt alo 2 I I aya ayaa I 8 lt 9 lt lt lt 2 2 2 2 lt 4 z gt lt lt N I lt NS lt lt lt lt lt SIN 1 17 3 1 ELECTRICAL PARTS LIST VR340 55 VR340 75 VR740 55 VR740 75 Pos A 12NC Description C716 CHIP CERAMIC CAP F Z 0 22UF 16V 1 1 CHIPCERAMICCAP FZ0 22UF IV 1 CER
52. 001 9965 000 08602 SURGE ABSORBER CNR 10D471K SWITCHES SW501 4822 276 13954 SWITCH KSM0614B 1 5 503 SWITCH KSM0614B 1 1 Sw506 9965 000 16625 LEAF SWITCH MXS01830MVP0 1 1 51 509 SWITCH KSM0614B SW510 1 SW511 TACT SWITCH KSM0614B 1 1 17 8 ELECTRICAL PARTS LIST VR340 55 VR340 75 VR740 55 VR740 75 Pos 12 Description SW512 4822 276 13954 TACT SWITCH KSM0614B 1 1 1 1 1001 9965 000 16627 SWITCHING TRANSFORMER CSA SW0233A 1 Too1 9965 000 17327 SWITCHING TRANSFORMER CSA SW0253C 1 1 P3001 PCBJUMPERD06P100 0 1 1 1 1 P501 PCBJUMPERD06P60 1 1 1 1 P502 JPCBJUMPERDO amp P90 1 1 1 1 mesos PGBJUMPERD06PS0 1 1 1 1 P507 PCBJUMPERD06P60 1 1 1 1 P751 POBJUMPERD06P190 111 1 1 P752 jPCBJUMPERDO amp PS5 1 1 1 1 TP754 PGBJUMPERD06PSS 1 1 1 TU701 996500012893 TUNER UNIT TMDG1 682A 1 TU701 9965000 12265 TUNERUNITTMDG2631A tt TU701 9965000 13684 TUNERUNITTMDG2 837A 11 fi V8501 9965 000 05260 CARBONP O T 100KOHMB 1 1 1 1 X302 9965000 05629 XTAL4433619MHZ 1 1 1 1 X501 9965000 12194 XTAL12 000MHZ 1 1 1 1 X502 9965000 12288 XTAL 32 768KHZ 20PPM 1 1 1 1 ISWiGBAMOVO p 1 1 SW513 4822276 13954 TACT SWITCHKSM06148 Tifi WOO 9965000 13680 FLAT CABLE 2P AWG26ft2651 P1 25 1
53. 1 Still Slow Control Frame Advance Timing Chart 1 SP Mode 18 RF SW F AD Internal Signal C DRIVE 78 C F R 16 H A SW 15 ROTA do mo Wed ET The first rise of RF SW after rise in F AD signal AT p N Stop detection T2 Acceleration Detection T1 ST Slow Tracking Value BL lt Reversal Limit Value 20ms rir STILL FRAME ADVANCE STILL Fig 3 1 14 4 274 2 LP SLP Mode 18 RF SW F AD Internal Signal C DRIVE PB CTL 78 C F R 16 H A SW 15 ROTA The first rise of RF SW after a rise in F AD signal L Acceleration Detection T1 Stop detection T2 a i Slow Tracking Value BL4 Reversal Limit Value 4 STILL FRAME ADVANCE STILL Fig 4 1 14 5 274 1 EJECT POWER OFF gt CASSETTE IN POWER ON gt STOP B gt STOP A gt PLAY gt RS gt FS gt PLAY gt STILL gt PLAY gt STOP A 9 9 514 LD FWD LD FWD z a l C gt a v Y lt gt gt x gt gt C lt a N C lt CC PLAY PAUSE 6 2 2 2 2 gt gt J I T i E o al U PLAY
54. 10 Q502 D 1 R302 D 2 R420 F 2 R530 SW509 F 1 F 1 1 1 C 1 F 1 B 1 E 1 E 1 A 3 F 2 C 3 C 3 C 1 D 2 E 1 C012 F 2 C339 C 2 C469 B 2 C711 Q503 D 2 R303 D 2 R421 C017 6 1 C340 C 2 C470 C 2 C716 0504 8 3 8304 D 2 R422 C020 6 1 C341 C 2 C471 C 2 C717 Q505 F 3 R305 D 2 R425 C021 6 1 C342 C 2 C472 8 2 C721 A RESISTORS R306 D 2 R430 R537 C025 L 2 C344 C 2 C473 8 3 C722 A 2 COILS J30 R307 D 3 R431 R539 C026 G 1 C345 C 3 C474 B 3 C723 J901 J912 F 1 R308 D 3 R432 R540 C051 F 1 C346 C 2 C475 B 2 C751 J931 R001 F 3 8309 0 3 8451 L003 8541 8542 C053 F 1 C348 C 3 C476 B 2 C752 R002 G 2 R310 D 3 R452 C056 F 1 C349 C 2 C477 B 3 C851 L010 R003 G 2 R311 D 3 R453 L012 R543 R544 C057 F 1 C350 C 3 478 3 852 R004 G 2 R312 D 3 R454 L052 R545 001 060 1 C351 C 3 C501 E 1 853 2005 G 2 R313 D 3 R455 L251 L301 R546 2001 8547 FP562 D 2 D 1 F 2 B 1 C061 F 1 C352 C 3 C503 C 1 C854 R006 G 2 R314 D 3 R456 E 1 C 1 C 1 D 1 A 3 C 2 A 2 A 2 A 2 A 1 A 1 E G SW514 G VR501 A 1 CRYSTAL OSCILLATORS 501 2 3 3 1 i C253 C255 C256 C301 C302 C303 C304 C305 C306 C307 C308 C309 C310 C311 C312 C313 C314 C315 C317 C318 C319 C320 C321 C323 C324 C326 C327 C328 C 3 C 3 C 3 D 3 D 3 D 3 D 3 D 3 D 3 D 3 D 3 C 2 D 3 D 3 D 3 D 3 D 3 D 2 A 3 D 3 D 2 D 2 D 3 1 D 3 C 2 D 2 D 2 C361 C362 C
55. 10501 IC503 COILS 4931 1501 1851 D TRANSISTORS Q501 Q502 A Q503 D RESISTORS R501 R502 R503 8504 R505 R506 R509 R511 R513 R514 R516 R517 R518 R519 R520 R521 R522 R523 C E m 2 2 2 2 2 A 2 B 2 E 1 A 3 A 4 B 1 E 4 E 3 E 3 D 3 E 3 D 3 D 4 C C C C C C C 4 B 4 4 B 3 3 A 2 A 2 4 B 1 1 1 A 3 3 D 1 4 1 4 1 1 1 3 0 4 1 2 1 2 4 1 4 4 1 4 2 4 2 D 3 1 0 3 1 0 4 1 0 4 0528 2 RESISTORS 4 4 1 11 2 Main 1 5 Schematic Diagram Comparison Chart of IC501 KEY VOLTAGE CHART MODE SP REG ae Models and Marks KEY 1 7PIN KEY 2 8 PIN 5 0 5 0 REC MODEL 2 5 VR340 55 0 00 0 51V POWER STOP EJECT THE SAME VOLTAGE FOR INDICATES THAT THE VOLTAGE VR340 75 0 51 0 92V CH DOWN BOTH PLAY amp REC MODES IS NOT CONSISTENT HERE VR740 55 0 92 1 27V CH UP VR740 75 187 SIV 1 61 1 98V 1 98 2 39V REC VIDEO SIGNAL Q3 PB VIDEO SIGNAL REC AUDIO SIGNAL z PB AUDIO SIGNAL 2 39 2 90 2 90 3 60V SYSCON TIMER SERVO BLOCK 3 60 4 30V 4 30 5 00V KEY OFF KEY OFF
56. 20 1 SW2CGBAMOVB 1 1 5VM514 4822 276 13954 SWITCHKSMO614B Tifi uWoo2 9965000 17216 FLAT CABLE 2P AWG2642651 P125 140 lili SENSOR CBA SENSOR CBA 0504 9965 000 08630 PHOTO TRANSISTOR PT204 6B 12 1 1 1 1 0505 9965 000 08630 TRANSISTOR PT204 6B 12 11 1 111 1 17 9 EXPLODED VIEWS Front Panel VR340 55 75 1 18 1 HE274FEX Cabinet Comparison Chart of Models and Marks VR340 55 VR340 75 VR740 55 VR740 75 21021 8 2L021 21021 21021 177773 See Electrical Parts List for parts with this mark Some Ref Numbers are not in sequence 1 18 2 HE274CEX Packing PRODUCT SAFETY NOTE Products marked with a have special characteristics important to safety Before replacing any of these components read carefully the product safety notice in this service manual Don t degrade the safety of the product through improper servicing MECHANICAL PARTS LIST VR840 58 Description RONT ASSEMBLY HE274PD RONT ASSEMBLY HE275AD RONT ASSEMBLY HE494PD RONT ASSEMBLY HE495AD ASE TOP HB465UD CASE TOP CHASSIS HE275AD CHASSIS 435MM HE495AD LABEL BAR CODE HE274PD ABEL BAR CODE HE275AD ABEL BAR CODE HE494PD ABEL BAR CODE HE495AD p LABEL RATING HE274PD DENEN A1X A1X wN gt gt gt gt gt gt
57. 39K OHM 1 10W J 10K OHM 1 10W J 10K OHM 1 10W J 1 5K OHM CHIP RES 1608 1 10W J 1 8K OHM 1608 1 10W J 680 OHM CHIP RES 1608 1 10W J 18K OHM 522 523 CHIP RES 1608 CHIP RES 1608 70 D m 528 529 530 533 534 535 536 537 538 539 540 gt 2 gt 2 E z ee m I I CHIP RES 1608 1 10W J 10K OHM 1608 1 10W J 33K OHM 1608 1 10W J 390K OHM 1608 1 10W J 390K OHM 1608 1 10W J 1 8K OHM 1608 1 10W J 1K OHM 1608 1 10W J 2 7K OHM 1608 1 10W J 2 2K OHM 1608 1 10W J 12K OHM 1608 1 10W J 1 8K OHM 1608 1 10W J 1K OHM 1608 1 10W J 1 2K OHM 1608 1 10W J 10K OHM 1608 1 10W J 10K OHM 1608 1 10W J 10K OHM 1608 1 10W J 56K OHM 1608 1 10W J 10K OHM 1608 1 10W J 10K OHM 1608 1 10W J 10K OHM 1608 1 10W J 10K OHM 1608 1 10W J 10K OHM 1608 1 10W J 10K OHM 1608 1 10W J 10K OHM 1608 1 10W J 10K OHM 1608 1 10W J 10K OHM OJ OJOlO Ol O O Ol O O SERERE 9 9 Ug w w 9 I IIDIO JOIOJOIJO O I mim mz 222220 20 20 20 20 20 2 115158885 C2 C2 C C OQ 2 gt lt lt lt 542 543 70 m 9 27 NIN 7 2 70 2 d 221 m m rm cube IX e er p n
58. 4 STOP LD REV STOP A 81 Bi 0 38 035 4 LM FWD mn GL ee E gt REV 0 25 gt 0 25 0 25 4 0 25 5 8 C DRIVE H 1 Refer to STILL L Nm M 20ms SLOW TIMING 048 20 5 HO an i L ADM EGER TT 40mS DRUM ON TETT EAN EET TEA ETTET ROTATION ON 67 a yO B 0 38 _ __ 9 4 4 0 25 0 85 MONO z 158 028 0 88 108 oss 0 88 REC 0 2S DATA EE 33 D REC H STILL STOP PLAY RS FS PLAY SLOW PLAY STOP DISPLAY gt lt 4 gt lt 4 Pit gt POWER OFF HE274TI 1 14 6 2 STOP A gt FF gt STOP A gt REW gt STOP A gt REC gt PAUSE gt PAUSE REC gt STOP A gt EJECT zu sa ow 5 05 2 iu 5 u i ul L ou amp ou amp i gt nu ou y y 5 gt gt gt gt gt gt lt gt gt lt gt gt 5 zu zou L L wm amp
59. 401 C403 C404 C405 C406 C407 C409 C410 C411 C412 C413 C414 C416 C420 C421 C423 C424 C430 C451 C452 C453 C454 C455 C456 C457 C458 A 1 D 2 C 3 C 3 C 3 C 3 E 3 F 3 E 3 F 3 D 3 C 3 D 3 C 3 C 3 C 3 D 3 C 3 C 3 C 3 B 3 B 2 B 3 B 3 B 3 B 3 B 3 B 3 C508 C510 C511 C512 C513 C514 C515 C516 C517 C518 C519 C520 C521 C522 C523 C524 C525 C526 C527 C528 C529 C530 C535 C537 C540 C541 C542 C545 8 1 C 1 C 1 C 1 C 1 C 1 C 2 C 2 1 1 D 1 D 1 D 1 D 1 D 1 D 1 D 1 D 1 D 1 D 1 D 1 D 1 D 2 A 2 E 1 1 D 1 C 1 856 858 859 1 2 1 2 2 1 D 3 2 2 C862 2 3 3 3 3 2 2 D 3 D 3 D 3 D 2 D 3 C 2 D 2 D 3 A 3 D 2 D 2 D 3 D 3 C 2 C 2 C 2 C 2 D 2 B 2 A 3 C 3 C 3 C 3 C 3 C 3 E 3 F 3 R459 R460 R461 R462 R463 R464 R465 R466 R467 R470 R471 R472 R473 R501 R502 R503 R504 R505 R506 R509 R511 R513 R514 R516 R517 R518 R519 R520 R008 6 2 8316 8009 2 8317 8010 G 2 R318 8011 6 2 8319 8012 6 2 8320 8013 C 2 8321 8014 6 2 8322 8015 C 2 8323 8016 C 2 R324 8020 6 1 8325 8021 F 2 R327 G 8022 L 2 8328 L 2 TRANSISTORS 8024 R023 F 2 R329 0001 R025 F 2 R330 Q002 R026 Q003 F 1 R332 G 1 R334 R027 F 2 R335 R028 R029 G 2 R336 R052 Q055 Q056 F 2 R340 F 1 R344 R054 F 1 R372 8058 6 1 8401 8060 F 1 R402 8061 F 1 R403 8067 8068 A A A C C C C C C C C C CONNE
60. 5 2 PREFIX SYMBOL CL MEANS WIRE SOLDER USED TO INDICATE TEST POINT WITH NO TEST PIN HOLES OF THE PCB USED TO INDICATE TEST POINT WITH TEST PIN VR340 75 WIRE IS SOLDERED DIRECTLY VR740 55 amp 1 PB AUDIO SIGNAL REC AUDIO SIGNAL SP REC 2 _ _ gt gt gt gt gt gt gt gt lt lt lt ENE MAIN CBA RE terse cn en Ag eae E erence a a TE CN701 CN1 CN701 TU AUDIO R i SIF OUT 2 SIF SD IF SIGNAL TADO AUDIO OUT PROCESS 5 TU AUDIO L 5 er AUDIO IN 49 A IN L i A IN R i oa FROM TO 96751 D F Hi Fi AUDIO A OUT L BLOCK I L i A B 1 i 77 40 maur A OUT R Ke N A REC N A PB Rear 66 7 ABAIN ji J918 A IN PY y 42 4 tote E 1 1 5 aT 1C301 AUDIO PROCESS AMP gt DECK ASSEMBLY SP LP ON Y A see ACE HEAD ASSEMBLY 1 i 1 CN287 CL504 A AUDIO DASE A PBIREC 4 4 K HEAD A COM 3 i 3 A COM i AUDIO 1 1 ERASE AE H FE H 2 2 AE H FE H HEAD I i p SERIAL
61. 8 1015 6 MAIN 5 5 0 2 ON SV 6007 oo7 SWITCHING P ON 5V L 1 2 lt p ontav gt 2 5 AL 5V 2 gt 1 0057 5 1 gt KRE103M SWITCHING P ON ON 0056 8 103M 1 BN1F4M T EA qi Ki 0009 VOLTAGE 0 8 1 zt p 8009 I Heer HOT dedi o 0004 j 3025 I BEAD 1 POWER SUPPLY BLOCK ry ao I POWER CONTROL BLOCK 1 2 3 14 amt 0 UNLESS OTHERWISE DIODES ARE 1N4148M OR 14SS133 T 77 NPN TRANSISTORS ARE KTC3199 Y GR 2SC2785 J OR 2SC1845 Y GA TPE2 bd Z AA BB ee 1 11 11 1 11 12 HE274SCM4 MAIN 4 5 Schematic Diagram Parts Location Guide Ref No CAPACITORS DIODES RESISTORS 1 11 13 MAIN 5 5 Schematic Diagram Parts Location Guide Ref No Ref No Position CAPACITORS C451 X2 C452 X2 C453 C454 IC451 Y 2 C455 C456 C457 C458 Z C459 2 C461 C462 Z C463 C464 C465 X C469 C470 C471 C472 C473 C474 X lt lt V 1 2 2 3 3 nm V V V Y Y x lt
62. AMIC CAP AX YMO OTUF GV 1 cERAMIC CAP AX 1000PF OV ELECTROLYTIC CAP 1UF 50VM__ GHIPGERAMIGGAP BK2200PFSOV 1 GHIPGERAMIGGAP BKA4700PFSOV GHIPGERAMIGGAP BK2200PFSOV 1 22 0 1 CHIPCERAMICCAP CHJ22PF SOV 1 GHIPGERAMIGGAP BKA4700PFSOV _ 1 010 50 1 GHIPGERAMIGGAP FZO1UFS0V 1 CAP CHJ180PF SOV 1 GHIPGERAMICGAP CHJ560PF50V fELEGTROLYTIGGAP 47UF63VMH7 _ 1 CHIP CERAMIC CAP BKO O1UF 50V _ 1 9965 000 12175 1 DIODES D001 4822 130 31933 RECTIFIER DIODE 1N4005 1 002 1 003 1 004 1 005 1 006 1 007 1 008 4822 130 30621 SWITCHING DIODE 1N4148M 1 009 1 ZENER DIODE DZ 33BSDT265 011 1 RECTIFIER DIODE BA157 1 1 018 N 019 9965 000 12904 7 DIODE DZ 5 1BSBT265 E a bl E eR eio jN oO 5 2 e as gt 45 1 1 1 021 1 RECTIFIER DIODE 1N4005 1 1 055 1 056 1 058 1 070 1 301 1 501 1 502 1 001 4822 070 31602 1 H001 1 FH002 4822 256 10461 1 FP562 9965 000 09307 1 IC 5 IC001 4822 130 11655 PHOTOCOUPLER LTV 817B F 1 1 1 1 1 1 COILS 901 4822 526 10685 BEAD CORE 816 RH 3 5X10X1 3 1 JACK MSP 283V B 324 1 JK752 RCA JACK MSP 282V 14 JK752 RCA JACK MSP 293V3 324 1 1 174 1 E
63. Assembly NOTE 1 Electrical adjustments are required after replacing circuit components and certain mechanical parts It is important to do these adjustments only after all repairs and replacements have been com pleted Also do not attempt these adjustments unless the proper equipment is available 2 To perform these alignment confirmation proce dures make sure that the tracking control is set in the center position Press either w or A button on the remote control unit first then the PLAY button Front Panel only Test Equipment Required 1 Oscilloscope Dual trace with 10 1 probe V Range 0 001 50V Div F Range DC AC 20MHz 2 Alignment Tape 4822 395 10283 Head Switching Position Adjustment Purpose To determine the Head Switching point during playback Symptom of Misadjustment May cause Head Switching noise or vertical jitter in the picture Test point Adj Point TP751 V OUT TP502 RF SW GND VR501 Switching Point MAIN CBA Measurement Tape Equipment Spec 6 5H 1H 4822 395 10283 412 7us 60us Oscilloscope Connections of Measurement Equipment Oscilloscope Main CBA Figure 1 EXT Syncronize Trigger Point V Sync L II I gt 0 5H 1 0H d 6 5H Switching Pulse Reference Notes Playback the Alignment tape and
64. C341 4 1304 M 2 M 2 lt N 1 O 2 O 2 N 4 N 4 N 4 O 4 R311 R419 R312 R420 DIODES R313 R421 D301 P 1 R314 R422 IC R315 R425 IC301 N 2 R316 R430 COILS R431 0 4 R432 N 1 CRYSTAL OSCILLATORS X302 0 4 TEST POINTS TP301 R317 R318 R319 R320 R321 R322 O C Q Q Q Q Q Q Q Q Q M 3 0 4 0 1 0 1 P 1 3 3 2 2 2 2 1 P 1 1 1 1 P 4 P 1 P 2 P 1 P 1 P 1 1 2 2 2 2 2 2 2 3 3 3 3 3 3 3 3 3 4 4 4 P 4 P 4 P 4 1 11 8 Main 3 5 Schematic Diagram 5 0 MODE SP REC PLAY MODE Comparison Chart of 50 REC MODE Models and Marks 2 5 MODEL THE SAME VOLTAGE FOR INDICATES THATTHE VOLTAGE VR340 55 BOTH PLAY amp REG MODES IS NOT CONSISTENT HERE VR340 75 VR740 55 VR740 75
65. CAP AX Z 0 047UF 16V CHIP CERAMIC CAP CH J 470PF 50V ELECTROLYTIC CAP 10UF 16V CHIP CERAMIC CAP F Z 0 1UF 50V CHIP CERAMIC 0 01UF 50V ELECTROLYTIC CAP 10UF 16V H7 ELECTROLYTIC CAP 1UF 50V H7 CHIP CERAMIC 2 0 1UF 50V ELECTROLYTIC CAP 1UF 50V H7 CHIP CERAMIC CAP B K 0 047UF 50V gt 070 253 255 256 301 C302 EE ER ER DE 1 17 1 1 ELECTRICAL PARTS LIST VR340 55 VR340 75 VR740 55 VR740 75 Pos A 12NC Description C303 ELECTROLYTIC CAP 1UF 50V M H7 1 1 1 304 305 306 307 308 309 310 312 313 318 319 320 321 323 324 326 327 328 330 331 7 0 1UF 50V 348 349 350 351 352 355 361 362 401 403 409 410 ILM CAP P 0 018UF 100V J lt 20 6 95 5 C 9 CC 9 9 9 96 9 CC 9 9 9 9 O 5 9 v o O 9 9 O 9 9 9 2 O O O 9 9 9 5 5 510 9 2 9 9
66. CIFICATIONS Comparison Chart of Models and Marks VR340 55 VR340 75 VR740 55 VR740 75 Description Minimum Nominal Maximum Remark Video 1 1 Video Output PB 0 8 1 0 1 2 SP Mode 1 2 Video Output R P 0 8 1 0 1 2 SP Mode W O Burst 1 4 Video Color S N AM R P 37 41 SP Mode 1 5 Video Color S N PM R P 30 36 SP Mode 1 6 Resolution PB SP Mode Servo 2 1 Jitter Low SP Mode 2 2 Wow amp Flutter SP Normal Audio 3 1 Output PB SP Mode 3 2 Output R P SP 3 3 S N R P SP Mode 3 4 Distortion R P SP Mode 3 5 Freq resp R P at 200Hz SP Mode 200B ref 1 2 at 6 2 SP Mode 1 3 Video S N Y R P 40 45 Tuner 4 1 Video output 4 2 Video S N 4 3 Audio output 4 4 Audio S N Hi Fi Audio C D 5 1 Output SP Mode 5 2 Dynamic Range SP Mode 5 3 Freq resp 6dB B W SP Mode Note Nominal specs represent the design specs All units should be able to approximate these some will exceed and some may drop slightly below these specs Limit specs represent the absolute worst condition that still might be considered acceptable In no case should a unit fail to meet limit specs 1 1 1 HE274SP IMPORTANT SAFETY PRECAUTIONS Product Safety Notice Some electrical and mechanical parts have special safety related characteristics which are often not evi dent from visual in
67. CLOCK indicator Timer indicator AC power cord AUDIO OUT jack AUDIO IN jack AERIAL terminal RF OUT terminal VIDEO IN jack 21 VIDEO OUT jack OND UR C You can use this remote control to operate some PHILIPS TVs Press VCR before pressing VCR feature buttons press TV before pressing TV feature buttons if you have a PHILIPS TV EJECT button MENU button NUMBER buttons MEMORY button gt PLAY button RECORD OTR button lt 9 REW button MUTE button CH annel buttons 10 VCR button 11 STANDBY ON button insert the batteries 12 STATUS button 13 CLEAR button 14 ALT CH button 15 STILL button 16 gt gt gt F FWD button 17 STOP button 18 VOL ume buttons 19 TV button 20 SPEED SYSTEM button Doesn t work on this model as the SYSTEM button Install two R6 batteries matching the polarity compartment indicated inside the battery On Battery Replacement Do not mix old and new batteries Also never mix alkaline batteries with manganese batteries 1 6 2 HE274IB I VR740 55 1 x Front Panel lt STANDBY ON button Cassette compartment STOP EJECT but
68. CTORS CN701 C070 F 1 C355 A 2 C506 B 1 C855 R007 F 2 R315 D 3 R458 L303 R549 JK752 R557 JK755 8611 TU701 A 1 R612 TEST POINTS R624 507 G 1 8714 8751 8752 8851 R852 A gt m 0001 0002 0003 0004 0005 0006 0007 0008 0009 0010 0011 0013 0014 0015 0018 0019 0021 0022 0052 0055 0056 F 3 D 1 A 3 A 3 A 1 A 1 A 1 C 1 F 3 G G G G G F 3 E 1 F 3 G 1 C 1 L 2 C 3 2 D 3 D 3 D 3 C 2 D 2 C 3 E 1 E 1 1 2 2 2 C 2 C C C C C C C C C C C C C C C C C C G G G C G G G G G G G E F 1 R404 1 405 R069 E 1 R406 070 408 E 3 D 3 3 3 3 D 3 3 D 3 D 3 3 3 3 3 3 D 3 B 3 B 3 3 3 3 3 B 2 B 2 B 2 B 2 B 3 B 3 B 3 B 3 B 3 B 3 B 2 B 3 B 3 B 3 1 B 1 D 1 B 1 D 1 B 1 B 1 1 2 B 1 1 2 D 2 D 2 E 1 F 2 2 F 2 2 3 F 2 L 2 L 2 L 2 L 1 2 L 1 1 1 2 L 1 L 2 L 1 2 L 1 1 2 1 D 3 1 D 3 F 2 D 3 F 1 1 11 23 1 11 24 AFV CBA Top View AFV CBA Bottom View SW1 CBA Top View SW1 CBA Bottom View 0 BHC400F01091 C 1 X 2 J1SCL 2 i SIF IN ive es ee BHE274F01 01 ff 1 4 CM509 1 20 15 SWETA p L2 cf15 1 Ms 1 2 o BHE274F01011C BHC400F01091 SW2 CBA Top View SW2 CBA Bottom View AF
69. DRV CLK EE Q501 I Q505 L END S L SENSOR CBA TU701 TUNER UNIT DECK ASSEMBLY M CL287 CL504 5 CTL 5 RS501 CONTROL HEAD 1 6 CTL 6 REMOTE 1C503 MEMORY A REMOCON IN SENSOR iz 2 Ae 0 lt L AC HEAD ASSEMBLY 61 I D REC H gt IIC BUS SDA To B 2 PG DELAY amp C BUS SCL AUDIO BLOCK SW POINT 4 A MUTE H AL 5V 31 A MUTE H 83 T o lt T Sgen cumin em RS SW506 T lICBUSSDA I CYLINDER ASSEMBLY CAPSTAN MOTOR 22 i IC 805 SCL i LI 1 mse wi i i Hi Fi H SW EE i Fi H Hi Fi AUDIO 1 SENSOR 5 CAPSTAN ete BLOCK gt lt AL 12V 2 O AL 12V A MUTE H i 4 MOTOR a 1 gt lt GND 1 Aare eos orum Mo E Gores ucsus soal M DONT j IIC BUS SCL 71 gt LM FWD REV 61 LM D REC H l PRE GND L gt RF SW C CONT gt C F R 78 C FIR D V SYNC FRoMrro i C FG FIA 89777 VIDEO BLOCK AL 5V O AL 5V 1 aeons MOTOR AL 12V C AL 12V cix lt o V ENV 6 o NG FROM TO P ON L 58 C SYNC o Oo 4 P DOWN L BLOCK P OFF H 2 1 10 1
70. EC PLAYMODE MODEL MARK For continued protection against fire hazard Fixed voltage or Auto voltage selectable power supply circuit is used in this unit 50 50 REC MODE VR340 55 A replace only with the same type fuse If Main Fuse F1001 is blown check to see that all components in the power supply 4 09 VR340 75 B circuit are not defective before you connect the AC plug to the AC power supply THE SAME VOLTAGE FOR INDICATES THAT THE VOLTAGE VR740 55 Otherwise it may cause some components in the power supply circuit to fail BOTH PLAY amp REG MODES IS NOT CONSISTENT HERE VR740 75 D NOTE 5 The voltage for parts in hot circuit is measured using hot GND as a common terminal m n CL CL A I CONTINUE MAIN 1 5 Fon gt S Orom S 9 0059 BAFFAM T SWITCHING P ON OFF ji 8068 I 40K 1 1 CONTINUE MAIN 2 5 C gt 1 1 T 2 8 28SAT265 02 i MAIN 3 5 MTZJT 778 11062 a 1 6 V3 Me 0058 Z 10BSBT265 9 MTZJT 7710B REGULATOR gt 0002 61C3499 8L 25 2785 0056 72501815 BL TPE2 D 5 689601265 059 SWITCHING MTZJT 775 6C i 1 4 6 SHITCHT N 4 5 0055 Fr 9 3 Ka 2
71. ECT 11 ifo o 34 I 8547 548 549 ge 1K 1 2K i I 1 C en SW510 SW511 SW512 TUNER BLOCK EN 1 3 8 I CONTINUE 8 9 I 8543 8544 8545 8546 2 4K 2 7K 2 eK 12K I pu C704 Tre 1701 1 54503 SN505 1 CH UP 1 8667018 TP507 4 in 3 8 SWITCHES ARE KSMO614B SKGSAFOO1A OR TC 1104 H 9 5 0 CN701 i CONTINUE pe i aje i se s nccws MAIN 5 5 I pem CE 5100 6 9V 1000 CD p IQ TU AUDIOIL gt 4 TU AUDIOIL gt a pix 1 11 6 HE274SCM2 MAIN 2 5 Schematic Diagram Parts Location Guide Ref No Ref No Position CAPACITORS C537 C540 C541 C551 C552 C561 C701 2 C711 1 R707 G 1 C716 G 1 R714 C717 G 1 R751 C721 G 1 R752 C722 H 1 R754 C723 H 1 R755 H 3 C751 H 3 R756 H 2 C752 H 3 SWITCHES CONNECTORS SW501 CN701 K 1 SW502 DIODES SW503 ICS SW505 IC561 4 SW507 COILS SW509 SW510 SW511 SW512 SW513 L 2 SW514 L 2 MISCELLANEOUS FP562 JK751 JK752 JK753 JK754 JK755 TU701 K 4 J 3 G 3 2 2 3 J J K K K 2 2 2 2 2 c H 2 H 2 J 2 J 2 AIAD K 2 J 3 2 1561
72. Fig DM7 Adj Screw Fig DM10 j be Groove of 28 2 When reassembling 10 12 confirm that pin of 10 28 pin of 12 are in the groove of 28 as shown View for A Fig DM8 U27NPCASIADA Cap Belt N Fig DM11 When installing 23 install the spring P 5 to 28 as shown in the left figure and then install 23 while bottom pressing the spring P 5 to of 23 the direction of the arrow in the left figure and confirming that the position of the spring P 5 is placed as shown in the left figure Pin on 22 Position of pin on 22 Fig DM12 2 4 6 U27NPCASIADA Refer to the Alignment Section Page 2 4 9 Position of Mode Lever when installed Break belt Pin of 31 Pin of 35 wl J PD Pin of 34 Align 25 and 28 as shown First groove on 28 First tooth on 44 When reassembling 28 align the first groove on gt 2 28 to the first tooth Top View 44 as shown Fig DM15 Fig DM13 2 4 7 U27NPCASIADA U27NPCASIADA 2 4 8 ALIGNMENT PROCEDURES OF MECHANISM The following procedur
73. LECTRICAL PARTS LIST VR340 55 VR340 75 VR740 55 VR740 75 Pos 12 Description JK753 4822 265 11659 JACK YELLOW MSP 281V4 B 1 1 4822 265 11661 RCA JACK WHITE MSP 281Vi B 1 9965 000 00423 RCA JACK RED MSP 281V3A 1 1 1 1 9965 000 05627 CHOKE COIL 47UH K 1 1 4822 157 11511 INDUCTOR 15UH K 26T 1 1 4822 157 10325 INDUCTOR 39UH K 26T 1 1 1 1 1 1 1 9965 000 05704 INDUCTOR 68UH K 26T 1 1 9965 000 05627 CHOKE COIL 47UH K 1 1 TRANSISTORS 9965 000 17186 FET 2SK3566 Q 001 k 001 002 RANSISTOR KTC3199 Y 4822 130 42292 TRANSISTOR KTC3203 Y 1 1 1 1 1 1 1 1 1 1 1 1 1 TRANSISTOR KTA1266 GR 1 1 1 1 4822 130 42292 TRANSISTOR KTC3203 Y 1 1 1 1 1 1 RESISTORS 8001 9965 000 08653 CARBON RES 1 2VV K 5 6M OHM 002 003 004 005 005 9965 000 08635 olololo 22 2 2 U gt FIFIOIOIO Io T 2 2 2 2 0 CICLO 5 olol C IC c 99 2 1608 1 10W J 22K OHM CHIP RES 1608 1 10W J 3 9K OHM 1608 1 10W J 100K OHM CHIP RES 1608 1 10W J 220K OHM 008 008 009 009 010 8011 U 2 2 2 2 20 DD 2 952 2
74. Location 1 11 14 Main 5 5 Schematic Diagram 20 4 1 11 15 Schematic Diagram 40 2 1 11 17 Main CBA Top View 24 4 2 1 11 19 Main CBA Bottom 1 11 21 Main CBA Parts Location Guide 1 11 23 SW1 SW2 8 CBA Top Bottom View 1 11 25 XX pa ea ia eens 1 12 1 WIRING DIAGRAM EG re ee EA Re DELE 1 13 1 SYSTEM CONTROL TIMING CHARTS 1 14 1 PIN FUNCTION 6 0 0 1 1 15 1 LEAD IDENTIFICATIONS lekt do had ea ee ane 1 16 1 ELEC TRIGAL PARTS LIST iss FEE ee pe be pe Sees unge 1 17 1 1 18 1 SET MECHANICAL PARTS 8 1 4 4 1 19 1 VR340CV SPE
75. N 70 0 0 0 222 22 22 m m m m m m DM Mm nm j CO 0106100 9199 1 ojojo NIN CIC CI GA U QO C1 4 gt C2 1 ojojo 70 2 322 323 324 CHIP RES 1608 1 10W J 560K OHM 325 327 CHIP RES 1608 1 10W J 4 7K OHM 328 329 CHIP RES 1608 1 10W J 8 2K OHM 330 CHIP RES 1608 1 10W J 390 OHM R332 CHIP RES 1608 1 10W 0 OHM 1 17 6 1 ELECTRICAL PARTS LIST VR340 55 VR340 75 VR740 55 VR740 75 Pos A 12NC Description 1608 CHIP RES 1608 R334 CHIP RES 1 10W J 1 8K OHM 1 1 1 1 10W J 1 2K OHM CHIP RES 1608 1 10W J 8 2K OHM CHIP RES 1608 1 10W J 6 8K OHM 1608 1 10W J 220 OHM 335 336 340 344 372 401 402 403 404 OJO gt gt 2m 2 ITI gt gt eg CHIP RES 1608 1 10VV J 2 2K OHM CHIP RES 1608 1 10W J 6 8K OHM CHIP RES 1608 1 10W J 2 2K OHM CHIP RES 1608 1 10W J 2 7K OHM CHIP RES 1608 1 10W J 1K OHM 1608 1 10W J 22K OHM 1608 1 10W J 47K OHM 5555 BE 22 11 Oo 410 414 415 416 417 418 419 420 421 421 422 RES 1608 1 10W J 22 1608 1 10W J 5 6 OHM 1608 1 10W J 12K
76. O 9 9 9 9 O 6 0000 1 Ala 4 5 5 5 4 4 malm 50 20 20 20 20 9 en mim mim m mim 9 250 2 50 9 20 2 2 50 9 2 xim 20 2 9 20 Im 20 20 2 2952 2222 525 22522522229222222222 gt 255 55255 5 5 52 gt 2 2 522222 52 8 lt lt lt lt lt lt lt lt lt lt 9 lt lt lt lt lt lt lt lt lt lt lt lt lt lt lt 45 4 4 gt gt 5 5 5 5 5 gt 4 lt 4 lt 445 5 5 5 4 45 lt 44 CI CICIC ICICIC I C ICI C IC ICI CICI CICICICIC IC ICICICICICICICICIC IC 5 C ICI ICIC IC ICICIC ICICICICICICICICICIC I C ICICICIC 5 CICIC C CIC gt 5I gt gt gt I gt gt gt gt gt gt gt gt gt gt gt gt gt 2 2 C 2 gt gt gt gt 9 gt 210 9 20 70 9 0 5 5 5 0 9 0 5 5 5 0 9 5 5 5 2 9 5 5 9 0 5 51 5 9 9 70 70 70 2 2 2 70 70 2 70 9 7
77. OHM 1608 1 10W OHM 1608 1 10W J 120 OHM 1608 1 10W J 27K OHM 1608 1 10W J 910 OHM 1608 1 10W J 2 7K OHM 1608 1 10W J 3 3K OHM 1608 1 10W J 22K OHM 1608 1 10W J 5 6K OHM 1608 1 10W J 2 2M OHM 1608 1 10W J 27K OHM 1608 1 10W J 3 3K OHM 1608 1 10W 0 OHM 1608 1 10W J 6 8K OHM 1608 1 10W J 39K OHM 1608 1 10W J 470 OHM 1608 1 10W J 2 7K OHM 1608 1 10W J 220K OHM 1608 1 10W 0 OHM 1608 1 10W J 39K OHM 1608 1 10W J 6 8K OHM 1608 1 10W J 39K OHM 1608 1 10W J 6 8K OHM 1608 1 10W J 22K OHM 1608 1 10W J 8 2K OHM 1608 1 10W J 1K OHM 1608 1 10W J 1K OHM 1608 1 10W J 6 8K OHM 1608 1 10W J 39K OHM 1608 1 10W J 39K OHM 1608 1 10W J 6 8K OHM 1608 1 10W J 6 8K OHM 1608 1 10W J 39K OHM 1608 1 10W J 1K OHM 1608 1 10W J 1K OHM 1608 1 10W J 1K OHM 1608 1 10W J 10K OHM CHIP RES 1608 1 10W J 10K OHM CHIP RES 1608 1 10W J 10K OHM CHIP RES 1608 1 10W J 4 7K OHM CHIP RES 1608 1 10W J 100K OHM CHIP RES 1608 1 10W J 1 8K OHM CHIP RES 1608 1 10W J 820 OHM CHIP RES 1608 1 10W J 330K OHM CHIP RES 1608 1 10W J 560 OHM CHIP RES 1608 1 10W J 470 OHM CHIP RES 1608 1 10W J 470 OHM C I 9 9 0 9 9 222 2 22 70 2
78. OSD VR740 75 V OUT SS Q307 Q304 IIC BUS SDA Esau BUFFER BUFFER x302 JW gt IIC BUS SCL SERVO SYSTEM c301 4 43MHz CONTROL BLOCK 4 Y C PROCESS 29 6766 9 3 25 26 21 20 2 06403 TU701 qb 5 VXO v CCD 1H SERIAL VIDEO 6 4 DELAY CLAMP 1 DECORDER i TU VIDEO 24 DETAIL V B Y ENH 1 RP P VI SUB FM DOUBLE fruer ep nd 9 9 e pemon SD V IN F FBC DOC YNR Y C COMB 4 RYP NOISE M JK752 ae 0302 0303 V IN 4 V PEAKING 1 PIC CTL wid FM REC AMP MIX ANR CLIP MOD FM EQ NL EMPHA 1 e a Bret FROMTO DRECH BPF d SERVO gt C SYNC G0 D REC H lt 4 DV SYNC 68 oS CONTROL oF SYNC P R E REC FM BLOCK 24 H KH G AE R B UP MAIN ER ACC gt F LT 4 SUB 4 C COMB COMB 4 43MHz R LPF x m 4 gt PB FM PB Lo b 1 629KHz AGC FM EQ L 59 57 54 52 51 61 71 72 DECK ASSEMBLY gt ASSEMBLY C ROTA 19 o 1 i COMP OUT 2094 HA SW FROM TO 1 1 De gt __ _ D V ENV CONTROL BLOCK i E RF S
79. PERATING CONTROLS AND 6 1 1 6 1 SIGNAL NAME ABBREVIATIONS 0 1 7 1 CABINET DISASSEMBLY 1 8 1 ELECTRICAL ADJUSTMENT INSTRUCTIONS 1 9 1 Adjustment Points and Test 1 9 2 BLOCK DIAGRAMS ERE Dr eae Lata ena eeu Pang ci a e E 1 10 1 SCHEMATIC DIAGRAMS CBAS AND 1 11 1 Main 1 5 Schematic Diagram Parts Location 1 11 2 Main 1 5 Schematic 1 11 3 Main 2 5 amp Sensor amp SW1 8 SW2 Schematic 1 11 5 Main 2 5 Schematic Diagram Parts Location 1 11 7 Main 3 5 Schematic Diagram Parts Location Guide 1 11 8 Main 3 5 Schematic 0 1 11 9 Main 4 5 Schematic 2 4 1 11 11 Main 4 5 Schematic Diagram Parts Location 1 11 13 Main 5 5 Schematic Diagram Parts
80. PVCC 0501 Jm FE HEAD CL501 gt 72801815 BL 1062 1 M 5 FE H 2 m 8 Ferje 5 g CONTINUE 29 04 MAIN 3 5 H A COMP 1 50 61 H N AF SW 48 61 era 1 52 81 C SYNC IIC 805 SDA IIC BUS SCL 33 01 C ROTA lt 050 V II xn 60 EVE MAIN 4 5 4 43ML7 ye L Hege SW POINT MID 32A22 D V SYNC P ONL o MX80 1830MVPO lt 1 P DOWN L REC SAFETY SENSOR S dd 7 TIMER SV 1 1 11 3 1 11 4 2745 1 Main 2 5 amp Sensor amp SW1 amp SW2 Schematic Diagram e SMD MODE SP REC PLAY MODE Comparison Chart of 50 N 50 REC MODE Models and Marks es MODEL THE SAME VOLTAGE FOR INDICATES THAT THE VOLTAGE VR340 55 BOTH PLAY amp REC MODES IS NOT CONSISTENT HERE VR340 75 VR740 55 VR740 75 REC VIDEO SIGNAL VIDEO SIGNAL REC AUDIO SIGNAL PB AUDIO SIGNAL Fr
81. V CBA Parts Location Guide Ref Position 8 1 8 2 1 58514 1E BH274F0101 __ 1 CRYSTAL OSCILLATORS C24 BHE274F01011E 1 11 25 1 11 26 WAVEFORMS TP751 of Main CBA 500VX10 UPPER TP751 of Main Lower TP502 of Main 7 S V OUT 0 1V x 1 5 UPPER 16301 of LowER TP502 of 10MV x 10 1 12 1 U27WFP Model Comparison Chart of Models amp Marks VR340 55 VR340 75 VR740 55 FE HEAD FULL ERASE HEAD PG SENSOR VR740 75 D NOTE FOR WIRE CONNECTORS 1 PREFIX SYMBOL CN MEANS CONNECTOR CAN DISCONNECT AND 2 PREFIX SYMBOL CL MEANS WIRE SOLDER HOLES OF THE PCB WIRE IS SOLDERED DIRECTLY SENSOR CBA BHB300F01014 SENSOR CBA BHB300F01014 WIRING DIAGRAM REAR VIDEO VIDEO AUDIO i AUDIO VIDEO i AUDIO AUDIO IN IN L OUT OUT L OUT CL504 AE H AE H FE H A COM DE EN Y AC HEAD ASSEMBLY CL287 AUDIO 1 ERASE HEAD
82. Video Cassette Recorder VR340 55 VR340 75 Service VR740 ss Se 740 75 Service D ICT I 16 VR340 55 75 VR740 55 75 Contents Survey of types Chapter VR340 VR740 Video Cassette Recorder Sec 1 Specifications Adjustment Procedure Schematic Diagrams and CBA s Exploded Views Survey of versions Mechanical and Electrical Parts Lists 55 75 PAL Sec 2 Standard Maintenance Mechanism Alignment Procedures Disassembly Assembly of Mechanism Deck Exploded Views Safety regulations require that the set be restored to its original condition and that parts which are identical with those specified be used Published by BK 2003 Video Service Department Printed in Japan Copyright reserved Subject to modification 3103 785 22210 MAIN SEGTION VIDEO CASSETTE RECORDER Sec 1 Main Section 9 Specifications 9 Adjustment Procedures 9 Schematic Diagrams and CBA s 9 Exploded Views 9 Mechanical and Electrical Parts List TABLE OF CONTENTS SPECIFICATIONS 52 Mae eee ae ee 1 1 1 IMPORTANT SAFETY PRECAUTIONS 1 4 1 2 1 STANDARD NOTES FOR 1 3 1 FUNCTION INDICATOR SYMBOLS rr 1 4 1 PREPARATION FOR SERVICING 1 5 1 O
83. W e I 4 1 Rey 1 5 89 2 1 T VIDEO L 2 HEAD gt 6 VR 2 gt gt SP p TP502 gt RF SW j NE D Je e I VIDEO R 2 HEAD 8 5 ioo o 85 gt E I 84 N e 4 m 1 GD 74 TP301 1 L T I 63 lt H gt an FE 82 ES gt HE274BLV Audio Block Diagram NOTE FOR WIRE CONNECTORS TEST POINT INFORMATION Comparison Chart of Models amp Marks Model SMD 1 PREFIX SYMBOL CN MEANS CONNECTOR INDICATES ATEST POINT WITH A JUMPER WIRE ACROSS HOLE IN THE CAN DISCONNECT AND gt USED TO INDICATE A TEST POINT WITH COMPONENT LEAD ON FOIL SIDE VR340 5
84. a 20 20 C T T T T T T T T T T T 9 EJ CLSB TL SB FB SM AL SM AL RS SS AU AL AU SM LD SW TL SF AU AU AU SS AU CL SS Jesse RPP PP PP Si SES G a espera RR iouis cias EJ Ge eem as der ae de pues pes __ VE pe Ve dt poste fe eee RS aepo MLE I m lee nien ee GLE HASSE LEI Bb omsf f d f 4 Eee MI B _ 23_ _________ _ __ _ _ 4 Deep de ee AL SB EDEA NA ssenpesem GR SETE GEGEN E SEG NENE 0 35 81 EE 0 38 gt T LM FWD M pem 1 REV 7 0 28 u TINE SP MODE LP SLP MODE DRUM ROTATION 67 P ON 83 A MUTE H DATA 33 D REC H DISPLAY ON 777 80mS6mS 160mS TI 038
85. adjust VR501 so that the V sync front edge of the CH1 video output wave form is at the 6 5H 412 7us delayed position from the rising edge of the CH2 head switching pulse wave form 1 9 1 HE274EA Adjustment Points and Test Points Main CBA Top View Hi Fi VIDEO AUDIO BLOCK POWER CTL SYSCON TIMER BLOCK 5 1 SERVO BLOCK CTL TP507 5 5 TEST POINT INFORMATION p Indicates a test point with a jumper wire across hole in the PCB comparison Models and Marks TEST POINTS NOT USED IN ELECTRICAL ADJUSTMENTS Test Point Used in Page No VR340 55 TP301 Mechanical Alignment Procedures 2 3 3 2 3 4 VR340 75 TP501 Mechanical Alignment Procedures 2 3 3 2 3 4 VR740 55 1 VR740 75 TP507 Preparation for Servicing 1 5 1 C D Audio Out L Main CBA Main CBA Audio In Audio Out Audio 2 ll Audio In SS Audio In Tuner Unit Video IC Tuner Unit Hc Antenna In Antenna Out Video Out Video In Antenna In Video In Antenna Out 1 9 2 HE274EA BLOCK DIAGRAMS Servo System Control Block Diagram
86. al to the specified value in the Power Cord Plug Prongs table below Measuring Method Power ON Insert load Z between B earth ground power cord plug prongs and exposed accessible parts Use an AC voltmeter to measure across the terminals of load Z See Fig 2 and the following table Table 2 Leakage current ratings for selected areas 5 One side of power cord AC Line Voltage Leakage Current i plug prongs B to is0 7mA Peak RF or parallel is2mA DC Antenna terminals 50kQ RES Connected in parallel 110 to 240 V Auto I VR340 55 VR740 55 1 240 V VR340 75 VR740 75 is0 7mA AC Peak is2mA DC A V Input Output Note This table is unofficial and for reference only Be sure to confirm the precise values 1 2 2 HE274SFTY STANDARD NOTES FOR SERVICING Circuit Board Indications a The output pin of the 3 pin Regulator ICs is indi cated as shown Bottom View Jin b For other ICs 1 and every fifth are indicated as shown Top View 5 BA LI TY YY DO 10 The 1st pin of every male connector is indicated as shown Pin 1 1 1 A Instructions for Connectors When you connect or disconnect the FFC Flexible Foil Connector cable be sure to first disconnect the AC cord FFC Flexible Foil Connector cable should be inserted parallel into the connector not at an angle X 0
87. e complete clo sure of the tool L When connecting or disconnecting the internal con nectors first disconnect the AC plug from the AC outlet HE274SFTY Safety Check after Servicing Examine the area surrounding the repaired location for Chassis or Secondary Conductor damage or deterioration Observe that screws parts and wires have been returned to their original posi Primary Circuit Terminals tions Afterwards do the following tests and confirm the specified values to verify compliance with safety p d standards 1 Clearance Distance When replacing primary circuit components confirm specified clearance distance d and d between sol dered terminals and between terminals and surround ing metallic parts See Fig 1 Table 1 Ratings for selected area Clearance AC Line Voltage Distance d 9 110 to 240 V Auto VR340 55 VR740 55 240 V VR340 75 VR740 75 O Exposed Accessible Part Note This table is unofficial and for reference only Be sure to confirm the precise values AC Voltmeter 2 Leakage Current Test High Impedance Confirm the specified or lower leakage current between B earth ground power cord plug prongs and externally exposed accessible parts RF termi nals antenna terminals video and audio input and output terminals microphone jacks earphone jacks g One side of etc is lower than or equ
88. e parts Note especially 1 Insulation tape 2 PVC tubing 3 Spacers 4 Insulators for transistors When replacing AC primary side components transformers power cord etc wrap ends of wires securely about the terminals before solder ing Observe that the wires do not contact heat produc ing parts heatsinks oxide metal film resistors fus ible resistors etc Check that replaced wires do not contact sharp edges or pointed parts When a power cord has been replaced check that 5 6 kg of force in any direction will not loosen it 1 2 1 Also check areas surrounding repaired locations J Use care that foreign objects screws solder drop lets etc do not remain inside the set K Crimp type wire connector The power transformer uses crimp type connectors which connect the power cord and the primary side of the transformer When replacing the transformer follow these steps carefully and precisely to pre vent shock hazards Replacement procedure 1 Remove the old connector by cutting the wires at a point close to the connector Important Do not re use a connector Discard it 2 Strip about 15 mm of the insulation from the ends of the wires If the wires are stranded twist the strands to avoid frayed conductors 3 Align the lengths of the wires to be connected Insert the wires fully into the connector 4 Use crimping tool to crimp the metal sleeve at its center Be sure to crimp fully to th
89. es describe how to align the individual gears and levers that make up the tape load ing unloading mechanism Since information about the state of the mechanism is provided to the System Control Circuit only through the Mode Switch it is essential that the correct relationship between individ ual gears and levers be maintained All alignments are to be performed with the mech anism in Eject mode in the sequence given Each procedure assumes that all previous procedures have been completed IMPORTANT If any one of these alignments is not performed properly even if off by only one tooth the unit will unload or stop and it may result in damage to the mechanical or electrical parts Alignment points in Eject Position Top View Alignment 3 Bottom View Alignment 1 0 Alignment 2 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 shown in Fig AL2 Alignment 2 Mode Gear Keeping the two triangles pointing at each other install the Loading Arm TU Assembly so that the last tooth of the gear meets the most inside teeth of the Mode Gear See Fig AL2 Alignment 1 Triangle Ma
90. f the Tracking Control Circuit 1 Connect the oscilloscope to TP301 C PB and TP501 CTL on the Main CBA Use TP502 RF SW as a trigger 2 Playback the Gray Scale of the Alignment Tape FL6NS8 and confirm that the PB FM signal is present 3 Set the Tracking Control Circuit to the center posi tion by pressing CH UP button then PLAY button on the unit Refer to note on bottom of page 2 3 4 4 Use the X Value Adj Screwdriver so that the PB FM signal at TP301 C PB is maximum Fig M6 5 Press CH UP button on the unit until the CTL wave form has shifted by approx 2msec Make sure that the envelope is simply attenuated shrinks in height during this process so that you will know the envelope has been at its peak U27PMAPC 6 Press CH DOWN button on the unit until the CTL waveform has shifted from its original position not the position achieved in step 5 but the position of CTL waveform in step 4 by approximately 2msec Make sure that the envelope is simply attenuated shrinks in height once CTL waveform passes its original position and is further brought in the minus direction 7 Set the Tracking Control Circuit to the center posi tion by pressing CH UP button and then PLAY button 1 C Checking Adjustment of Envelope Waveform Purpose To achieve a satisfactory picture and precise tracking Symptom of Misalignment I the envelope output is poor noise will appear in the picture The
91. gt 2 SN 4 2 gp 100 31 i 008 C355 ev 0372 8325 14 9 61 1266 68 00716VI 1872 SUIS BR Taar GND 1 ay SWITCHING VIDEO AUDIO 1 2 3 4 5 6 7 X8 9 19 44 13 14 15 19 20 21 22 23 25 25 27 30 5 0 12407 STONAL PROCESS 5 272 472 572 276 772 472 4 074 872 570 4 3 2 2 0 Ji 4 28 2 4 3 7320 6 0 aad0 084 10K C408 1 7 CONTINUE A70P 9344 1 0 _ 2 7 MAIN 1 5 100V RS 9408 220 2 01 0305 N L KiAfag6 eR ate 02 0 3aSA1646 6RITPE2 844 5 0 BUFFER 0402 MIC3203 V 2862120 81AS osc L403 SANT 5 1 405 N1511 16850 0403 FMG4A 7148 529 RA103M 0303 15 0 BN4F 4M T KTC3B78Y RTK I 3345 GER SWITCHING PEAKING AMP 0302 KTC3879Y RTK PEAKING 0308 1 8 KTC3875Y RTK 3592 Ss gens ow mde rt i 4 6 BUFFER 303 8308 5308 8309 8314 EN 12 082 39VII820 0380 577 5 0 18340 mr II L308 22uH 8 4 4 2 7 6 1 9 3 4 5 73530 M3 M3 P 1 11 9 1 11 10 HE274SCM3 Main 4 5 Schematic Diagram Comparison Chart of Models and Marks CAUTION CAUTION MODE SP R
92. ignment Note To do these alignment procedures make sure that the Tracking Control Circuit is set to the center position every time a tape is loaded or unloaded Refer to page 2 3 4 procedure 1 G step 2 Equipment required Dual Trace Oscilloscope VHS Alignment FL6NS8 Guide Roller Adj Screwdriver X Value Adj Screwdriver Note Before starting this Mechanical Alignment do all Electrical Adjustment procedures Flowchart of Alignment for tape traveling Loading Use a blank tape Adjust the height of the Guide Rollers Supply side and take up side Use a blank tape pg 2 3 3 Check to see that the tape is not creasing and that there is no slack on the supply and take up side Guide Rollers Use a blank tape 1 A Adjust the X Value for maximum envelope pg 2 3 3 Use Alignment Tape 1 B Adjust the envelope pg 2 3 4 Check the envelope Not good OK Adjust the Audio Section Azimuth Alignment pg 2 3 4 1 D Check the audio output n5 Not good OK Check the following Not good 1 X Value pg 2 3 3 9 2 Envelope 2 3 4 2 3 2 Not good Do the final tape traveling test to see that the tape runs normally in play mode with out creasing or slacking 1 A Completion Adjust the X value and envelope 1 8 1 U27PMAPC 1 A Preliminary Final Checking and Alignment of Tape Path Purpose To make sure that the tape path is well s
93. lope should match the number of pushes CH DOWN button from center If required redo the X Value Alignment 1 D Azimuth Alignment of Audio Con trol Erase Head Purpose To correct the Azimuth alignment so that the Audio Control Erase Head meets tape tracks properly Symptom of Misalignment If the position of the Audio Control Erase Head is not properly aligned the Audio S N Ratio or Frequency Response will be poor 1 Connect the oscilloscope to the audio output jack on the rear side of the deck 2 Playback the alignment tape FL6NS8 and confirm that the audio signal output level is 6kHz 3 Adjust Azimuth Adj Screw so that the output level on the AC Voltmeter or the waveform on the oscillo Scope is at maximum Fig M6 Dropping envelope level at the beginning of track Dropping envelope level at the end of track Envelope is adjusted properly No envelope drop U27PMAPC order STEP LOG No DISASSEMBLY ASSEMBLY PROCEDURES OF DECK MECHANISM Before following the procedures described below be sure to remove the deck assembly from the cabinet Refer to CABINET DISASSEMBLY INSTRUCTIONS on page 1 8 1 All the following procedures including those for adjustment and replacement of parts should be done in Eject mode see the positions of 41 and 42 in Fig DM1 on page 2 4 3 When reassembling follow the steps in reverse START ING No PART REMOVAL INSTALLATION REMOVEFUNHOOK Fig
94. m is used for the Tape Start and End Sensors on this equipment Carefully read and follow the instructions below Otherwise the unit may operate erratically What to do for preparation Insert a tape into 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 SENSOR INHIBITION to GND This will stop the function of Tape Start Sensor Tape End Sensor and Reel Sensors II these TPs are con nected before plugging in the unit the function of the sensors will stay valid See Fig 1 Note Because the Tape End Sensors are inactive do not run tape all the way to the start or the end of the tape to avoid tape damage 1 5 1 HE274PFS OPERATING CONTROLS AND FUNCTIONS I V8340 55 1 Front Panel lt 1 STANDBY ON button 2 Cassette compartment 3 B 4 STOP EJECT button 4 gt gt FWD button 5 button 6 lt REW button 7 RECORD button 8 Display window See below 9 CHANNEL buttons Rear Panel 10 PWR Power indicator 11 TAPE IN indicator 12 indicator 13 Timer indicator 14 CLOCK indicator 15 16 17 18 1 RE 15 AC power cord 16 AUDIO OUT jack 17 AUDIO IN jack 18 AERIAL terminal 19
95. ole 8 MINC S X spt ec HIFI QUT L RR ager ul 5 5 I I HOT 6703 5 25 298 II SS 1100 2 3 m a 5 J 3 R006 8 0 5 4 3 1 3 J83 78 X301 TICBUS CLK mmm J TU A IN L P ON 5V GND 185 V ENV IICBUS CLK D V SYNC 1ICBUS DATA AL 5V VIDEO OUT 1809 ASSN J163 GND ALL 32V L308 114 J71 1134 HIFI H SW J79 Jet J84 0M 5V D REC H 1153 H A SW 2154 TEKE EEE med 2 5 E S lt J928 6 8 II 03058 MODA Ye fi 0844 B Cus Jerg MIFTTQUT R 2 1247 C 5 J93 M 5 R x 3 HIFI IN R 5 2 P A GJE pp 0 iis 506 Hew Uv cr 2 ex 6332 6333 L I M L4 J910575N5V COMPLETE UNIT PATENTS PENDING 64 JAPAN AND 17 WORLD WIDE GND 1 Jpg TU SCL w c7 i 9 e
96. ower 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 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 AL 15V AL 32V P ON L AL 12V AL 5V P ON 5V TIMER 5V P DOWN L P OFF H Q055 001 VOLTAGE DET Q057 Q004 SHUNT REGULATOR HE274BLP SCHEMATIC DIAGRAMS CBA S AND TEST POINTS Standard Notes WARNING Many electrical and mechanical parts in this chassis have special characteristics These characteristics often pass unnoticed and the protection afforded by them cannot necessarily be obtained by using replace ment components rated for higher voltage wattage etc Replacement parts that have these special safety characteristics are identified in this manual and its supplements electrical components having such fea tures are identified by the mark A schematic diagram and the parts list Before replacing any of these components read the parts list in this manual carefull
97. rate some PHILIPS TVs Press VCR before pressing VCR feature buttons press TV before pressing TV feature buttons if you have a PHILIPS TV On Battery Replacement Do not mix old and new batteries Also never mix alkaline batteries with manganese batteries 1 6 3 HE274IB VR740 75 1 x Front Panel gt Indicator REW PLAY FWD 0 YO e gt 18 19 20 21 rT I 22 23 24 STANDBY ON button Cassette compartment B 4 STOP EJECT button gt gt F FWD button gt PLAY button lt lt REW button RECORD button Display window See below 9 CHANNEL a v buttons 10 A V CONNECTORS 13 PWR Power indicator 14 TAPE IN indicator 15 REC indicator 16 Timer indicator 17 CLOCK indicator 18 AC power cord 19 AUDIO OUT jacks 20 AUDIO IN jacks 21 AERIAL terminal 22 VIDEO OUT jack 23 VIDEO IN jack 24 RF OUT terminal OND of NOTE button MENU button NUMBER buttons MEMORY button gt PLAY button RECORD OTR button lt lt lt 4 REW button MUTE button CH annel buttons 10 VCR button 11
98. rks Loading Arm VER SP Assembly Last Tooth Alignment 2 Loading Arm TU Assembly Most inside teeth of Mode Gear Mode Gear Fig AL2 Alignment 3 Cam Gear A Rack Assembly 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 AL3 Top View Cam Gear A HI Alignment 3 First tooth First groove on the Cam Gear A HI Gear on Rack Assembly Fig AL3 2 4 9 U27NAPM DECK EXPLODED VIEWS Deck Mechanism View 1 Floil G 684G or Multemp MH D Blue grease 44444 SLIDUS OIL 150 Chassis Assembly Top View Lubricating Point Some Ref Numbers are not in sequence Chassis Assembly Bottom View Lubricating Point 2 5 1 UHE274DEX Deck Mechanism View 2 Floil G 684G or Multemp MH D Blue grease SLIDUS OIL 150 SANKOUL FG84M Yellow grease 11151 8525 Comparison Chart of Models and Marks VR340 55 VR340 75 p VR740 55 EN S EE VR740 75
99. s List TABLE OF CONTENTS STANDARD MAINTENANCE 2 2 1 1 SERVICE FIXTURE AND TOOLS 4 fied Aa be are FE et eat 2 2 1 MECHANICAL ALIGNMENT PROCEDURES 0 2 3 1 DISASSEMBLY ASSEMBLY PROCEDURES OF DECK 2 4 1 ALIGNMENT PROCEDURES OF 4 1 2 4 9 DECK EXPLODED VIEWS sr Abe S r SR Eg eet eee egg ee KE ES 2 5 1 DECK PARTS LIST 6 0 2 6 1 VR340CV STANDARD MAINTENANCE Service Schedule of Components Hours Check Change Deck Periodic Service Schedule Part Name 2 000 H 3 000 H 82 Cylinder Assembly B3 Loading Motor Assembly B8 Pulley Assembly B587 Tension Lever Assembly B31 AG Head Assembly B573 B574 Reel SP D2 Reel TU D2 B37 Capstan Motor B52 Cap Belt B73 FE Head B133 B134 Gear Idler Arm B410 Pinch Arm Assembly B414 M Brake SP Assembly B416 M Brake TU Assembly B525 LDG Belt B569 2 head only Cam Holder F B593 4 head 4 head HiFi only Cam Holder F Assembly Notes 1 Clean all parts for the tape transport Upper Drum with Video Head Pinch Roller Audio Control Head Full Erase Head using 90 Isopropyl
100. spection nor can the protection they give necessarily be obtained by replacing them with components rated for higher voltage wattage etc Parts that have special safety characteristics are identified by on schematics and in parts lists Use of a substitute replacement that does not have the same safety characteristics as the recommended replacement part might create shock fire and or other hazards The Product s Safety is under review contin uously and new instructions are issued whenever appropriate Prior to shipment from the factory our products are carefully inspected to confirm with the recognized product safety and electrical codes of the countries in which they are to be sold However in order to maintain such compliance it is equally impor tant to implement the following precautions when a set is being serviced Precautions during Servicing A Parts identified by the symbol are critical for safety Replace only with part number specified B In addition to safety other parts and assemblies are specified for conformance with regulations applying to spurious radiation These must also be replaced only with specified replacements Examples RF converters RF cables noise block ing capacitors and noise blocking filters etc C Use specified internal wiring Note especially 1 Wires covered with PVC tubing 2 Double insulated wires 3 High voltage leads D Use specified insulating materials for hazardous liv
101. tabilized Symptom of Misalignment If the tape path is unstable the tape will be damaged Note Do not use an Alignment Tape for this proce dure If the unit is not correctly aligned the tape may be damaged 1 Playback a blank cassette tape and check to see that the tape runs without creasing at Guide Rollers 2 and 8 and at points A and B on the lead sur face Refer to Fig M3 and M4 2 f creasing is apparent align the height of the guide rollers by turning the top of Guide Rollers 2 and 3 with a Guide Roller Adj Screwdriver Refer to Fig M3 and M5 Guide Roller 2 Guide Roller 3 ACE Head Lead Surface of Cylinder Tape Fig Correct Incorrect Guide Roller Take up Guide post 3 Check to see that the tape runs without creasing at Take up Guide Post 4 or without snaking between Guide Roller 3 and AC Head Fig M3 and M5 4 II creasing or snaking is apparent adjust the Tilt Adj Screw of the AC Head Fig M6 Azimuth Adj Screw X Value Adj Screwdriver Tilt Adj Screw 1 B X Value Alignment Purpose To align the Horizontal Position 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 position o
102. that the flat pack IC is not being held by glue When the flat pack IC is removed from the CBA handle it gently because it may be damaged if force is applied Hot Air Blower Iron Wire Soldering Iron To Solid Mounting Point Fine Tip Soldering Iron Flat Pack IC Tweezers Fig S 1 6 NOTE 1 2 Installation 1 Using desoldering braid remove the solder from the foil of each pin of the flat pack IC on the CBA so you can install a replacement flat pack IC more easily 2 The mark on the flat pack IC indicates pin 1 See Fig S 1 7 Be sure this mark matches the 1 on the PCB when positioning for installation Then presolder the four corners of the flat pack IC See Fig S 1 8 3 Solder all pins of the flat pack IC Be sure that none of the pins have solder bridges Example Pin 1 of the Flat Pack IC is indicated by mark Presolder Flat Pack IC Instructions for Handling Semi conductors Electrostatic breakdown of the semi conductors may occur due to potential difference caused by electro static charge during unpacking or repair work 1 Ground for Human Body Be sure to wear a grounding band 1MQ that is prop erly grounded to remove any static electricity that may be charged on the body 2 Ground for Workbench Be sure to place conductive sheet or copper plate with proper grounding 1MQ on the workbench or other surface where the semi
103. ton 10 9 8 o I gt I F FWD button P PLAY button KW J REW button RECORD button Display window See below CHANNEL buttons 10 A V CONNECTORS 13 PWR Power indicator 14 TAPE IN indicator 15 indicator 16 Timen indicator 17 CLOCK indicator 19 20 21 18 AC power cord 19 AUDIO OUT jacks 20 AUDIO IN jacks 21 AERIAL terminal 22 VIDEO OUT jack 23 VIDEO IN jack 24 RF OUT terminal LI 22 23 24 x Remote Control 1 EJECT button 13 STATUS button 1 2 MENU button 14 CLEAR button 2 3 NUMBER buttons 15 ALT CH button 4 MEMORY button 16 STILL button 5 P A PLAY button 17 gt gt 9 F FWD button 6 RECORD OTR button 18 STOP button lt 1 lt 4 REW button 19 VOL ume buttons 8 MUTE button 20 TV button 9 CH annel buttons 21 TIME SEARCH button 10 VCR button 22 SPEED SYSTEM button 11 AUDIO SELECT button 23 SLOW button OND e NOTE 12 STANDBY ON button To insert the batteries Install two 86 batteries matching the polarity indicated inside the battery compartment You can use this remote control to ope
104. tracking will then lose precision and the playback picture will be distorted by any slight varia tion of the Tracking Control Circuit 1 Connect the oscilloscope to TP301 C PB on the Main CBA Use TP502 RF SW as a trigger 2 Playback the Gray Scale on the Alignment Tape FL6NS8 Set Tracking Control Circuit to the center position by pressing CH UP button and then PLAY button on the unit Adjust the height of Guide Rollers 2 and 3 Fig M3 Page 2 3 3 watching the oscilloscope display so that 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 Guide Roller 2 Refer to Fig M3 so that the waveform looks like the one shown in Fig M9 4 the envelope is as shown in Fig adjust the height of Guide Roller 3 Refer to Fig M3 so that the waveform looks like the one shown in Fig M9 5 When Guide Rollers 2 and 3 Refer to Fig M3 are aligned properly there is no envelope drop either at the beginning or end of track as shown in Fig M9 Note Upon completion of the adjustment of Guide Rollers 2 and 3 Refer to Fig M3 check the X Value by pushing the CH UP or DOWN buttons alter nately to check the symmetry of the envelope Check the number of pushes to ensure center position The number of pushes CH UP button to achieve 1 2 level of enve
105. ustment Electrical Adjustments Alignment Tape FL6N8 2 Head model FL6NS8 4 Head model Azimuth and X Value Adjustment of Audio Control Head Adjustment of Envelope Waveform Guide Roller Adj Screwdriver Available Locally Guide Roller Mirror Available Locally Tape Transportation Check Azimuth Adj Screwdriver Available Locally A C Head Height X Value Adj Screwdriver Available Locally 2 2 1 X Value U25PCFIX MECHANICAL ALIGNMENT PROCEDURES Explanation of alignment for the tape to correctly run starts on the next page Refer to the information below on this page if a tape gets stuck for example in the mechanism due to some electrical trouble of the unit Service Information A Method for Manual Tape Loading Unloading To load a cassette tape manually 1 Disconnect the AG plug 2 Remove the Top Case and Front Assembly 3 Insert a cassette tape Though the tape will not be automatically loaded make sure that the cassette tape is all the way in at the inlet of the Cassette Holder To confirm this lightly push the cassette tape further in and see if the tape comes back out by a spring motion just as much as you have pushed in Turn the LDG Belt in the appropriate direction shown in Fig M1 for a minute or two to complete this task To unload a cassette tape manually 1 Disconnect the AC plug Remove the Top Case and Front Assembl
106. y Make sure that the Moving guide preparations are in the Eject Position Turn the LDG Belt in the appropriate direction shown in Fig M1 until the Moving guide prepara tions come to the Eject Position Stop turning when the preparations begin clicking or can not be moved further However the tape will be left wound around the cylinder Turn the LDG Belt in the appropriate direction con tinuously and the cassette tape will be ejected Allow a minute or two to complete this task 2 3 1 B Method to place the Cassette Holder in the tape loaded position without a cassette tape 1 Disconnect the AC Plug 2 Remove the Top Case and Front Assembly 3 Turn the LDG Belt in the appropriate direction shown in Fig M1 Release the locking tabs shown in Fig M1 and continue turning the LDG Belt until the Cassette Holder comes to the tape loaded position Allow a minute or two to complete this task Top View Moving guide T preparation Eject Position Moving guide S preparation Eject Position UNLOAD EJECT I Side View Push the tape to load it Push the locking tab gently to unlock when loading without a cassette Bottom View LDG Belt B UNLOAD 227 EJECT Cam Gear U27PMAPC 1 Tape Interchangeability Al
107. y 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 Standard temperature 20 C 20 20 Temperature range 25 4 85 25 85 25 85 Capacity change rate 10 30 80 15 20 25 85 22 5 Capacitors and transistors are represented by the fol lowing symbols lt PCB Symbols gt Top View Bottom View gt Electrolytic Capacitor TN Notes 1 Do not use the part number shown on these draw ings for ordering The correct part number is shown in the parts list and may be slightly different or amended since these drawings were 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 manual 3 Prefix symbol CN means connector can dis connect and reconnect Prefix symbol CL means wire solder holes of the PCB wire is soldered directly 4 How to read converged lines 1 D3 e t 3 1 B1 Distinction Area ME Line Number 2 AREAB 1 to 3 digits 177 c o 1 1 D3 means that line number 1 goes to area D3 2 1 B1 means that

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