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Philips VR340/55 Service Manual

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Video Cassette Recorder
Service
Service
Service
STANDBY/ON
CHANNEL
VR340/
Service Manual
Contents
Chapter
Sec. 1:
Specifications
Adjustment Procedure
Schematic Diagrams and CBA's
Exploded Views
Mechanical and Electrical Parts Lists
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
RECORD
STOP/EJECT
REW.
PLAY
FWD.
/
/
55
75
Printed in Japan
STANDBY/ON
CHANNEL
Survey of types:
VR340, VR740: Video Cassette Recorder
Survey of versions:
/55/75
PAL
c Copyright reserved
Subject to modification
VR340/
VR340/
VR740/
VR740/
RECORD
REW.
PLAY
FWD.
VR740/
/
55
75
GB
3103 785 22210
55
75
55
75
/
STOP/EJECT

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Summary of Contents for Philips VR340/55

  • Page 1 Video Cassette Recorder VR340/ VR340/ Service VR740/ Service VR740/ Service STANDBY/ON STOP/EJECT RECORD STOP/EJECT REW. PLAY FWD. RECORD REW. PLAY FWD. STANDBY/ON CHANNEL CHANNEL VR340/ VR740/ Service Manual Contents Survey of types: Chapter VR340, VR740: Video Cassette Recorder Sec. 1: Specifications Adjustment Procedure Schematic Diagrams and CBA's...

  • Page 2: Table Of Contents

    MAIN SECTION VIDEO CASSETTE RECORDER Sec. 1: Main Section I Specifications I Adjustment Procedures I Schematic Diagrams and CBA’s I Exploded Views I Mechanical and Electrical Parts List TABLE OF CONTENTS SPECIFICATIONS ............... 1-1-1 IMPORTANT SAFETY PRECAUTIONS .

  • Page 3: Specifications

    SPECIFICATIONS Comparison Chart of Models and Marks Model Mark VR340/55 VR340/75 VR740/55 VR740/75 Description Unit Minimum Nominal Maximum Remark 1. Video 1-1. Video Output (PB) Vp-p SP Mode 1-2. Video Output (R/P) Vp-p SP Mode, 1-3. Video S/N Y (R/P) W/O Burst 1-4.

  • Page 4: Important Safety Precautions

    IMPORTANT SAFETY PRECAUTIONS Product Safety Notice I. Also check areas surrounding repaired locations. J. Use care that foreign objects (screws, solder drop- Some electrical and mechanical parts have special lets, etc.) do not remain inside the set. safety-related characteristics which are often not evi- K.
  • Page 5 (d) (d’) 110 to 240 V (Auto) Exposed Accessible Part ≥ 3 mm(d) [ VR340/55, VR740/55 ], ≥ 6 mm(d’) 240 V [ VR340/75, VR740/75 ] Note: This table is unofficial and for reference only. Be sure to confirm the precise values.

  • Page 6: Standard Notes For Servicing

    STANDARD NOTES FOR SERVICING Circuit Board Indications How to Remove / Install Flat Pack-IC a. The output pin of the 3 pin Regulator ICs is indi- 1. Removal cated as shown. With Hot-Air Flat Pack-IC Desoldering Machine:. (1) Prepare the hot-air flat pack-IC desoldering Top View Bottom View machine, then apply hot air to the Flat Pack-IC...
  • Page 7 With Soldering Iron: (4) Bottom of the flat pack-IC is fixed with glue to the CBA; when removing entire flat pack-IC, first apply (1) Using desoldering braid, remove the solder from all soldering iron to center of the flat pack-IC and heat pins of the flat pack-IC.
  • Page 8 2. Installation Instructions for Handling Semi-conductors (1) Using desoldering braid, remove the solder from the foil of each pin of the flat pack-IC on the CBA Electrostatic breakdown of the semi-conductors may so you can install a replacement flat pack-IC more occur due to a potential difference caused by electro- easily.

  • Page 9: Function Indicator Symbols

    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 PWR.

  • Page 10: Preparation For Servicing

    PREPARATION FOR SERVICING How to Enter the Service Mode About Optical Sensors Caution: An optical sensor system 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.

  • Page 11: Operating Controls And Functions

    On Battery Replacement You can use this remote control to operate Do not mix old and new batteries. (Also never mix some PHILIPS TVs. Press [VCR] before alkaline batteries with manganese batteries.) pressing VCR feature buttons; press [TV] before pressing TV feature buttons if you have a PHILIPS TV.
  • Page 12 CAUTION You can use this remote control to operate On Battery Replacement some PHILIPS TVs. Press [VCR] before Do not mix old and new batteries. (Also never mix pressing VCR feature buttons; press [TV] before alkaline batteries with manganese batteries.) pressing TV feature buttons if you have a PHILIPS TV.
  • Page 13 On Battery Replacement You can use this remote control to operate Do not mix old and new batteries. (Also never mix some PHILIPS TVs. Press [VCR] before alkaline batteries with manganese batteries.) pressing VCR feature buttons; press [TV] before pressing TV feature buttons if you have a PHILIPS TV.
  • Page 14 CAUTION You can use this remote control to operate On Battery Replacement some PHILIPS TVs. Press [VCR] before Do not mix old and new batteries. (Also never mix pressing VCR feature buttons; press [TV] before alkaline batteries with manganese batteries.) pressing TV feature buttons if you have a PHILIPS TV.

  • Page 15: Signal Name Abbreviations

    SIGNAL NAME ABBREVIATIONS Signal Name Function Signal Name Function Drum Motor Phase/Frequency D-PFG Generator 4.43MHz 4.43MHz Clock D-REC-H Delayed Record Signal A-COM Audio Head Common D-V- SYNC Dummy V-sync Output A-IN Audio Signal Input DRV-CLK LED Clock Driver IC Control Clock A-MODE Hi-Fi Tape Detection Signal DRV-DATA...
  • Page 16 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 Video Head Switching Pulse PG-DELAY Signal Adjusted Voltage P-ON Power Detection Input POW-SAF Signal Recording Safety SW Detect (With REC-SAF-SW Record tab="L"/With out Record tab="H")

  • Page 17: Cabinet Disassembly Instructions

    Comparison Chart of Models and Marks (2): Name of the part Model Mark (3): Figure Number for reference (4): Identification of parts to be removed, unhooked, VR340/55 unlocked, released, unplugged, unclamped, or VR340/75 desoldered. P=Spring, L=Locking Tab, S=Screw, VR740/55 CN=Connector...
  • Page 18 FE Head (L-2) Cylinder (L-2) Assembly ACE Head [4] Deck Assembly Assembly (W-1) [2] Front Assembly (S-4) (W-1) (L-1) Fig. 2 (S-2) (S-2) [5] Main CBA (S-4) [3]VCR (S-4) Chassis Unit From From Capstan From From Motor Cylinder ACE Head FE Head Assembly Assembly...
  • Page 19 SW507 LD-SW [5] Main CBA [4] Deck Assembly Cam Gear Hole Shaft Hole LD-SW [5] Main CBA Fig. 5 1-8-3 HE274DC...

  • Page 20: Electrical Adjustment Instructions

    ELECTRICAL ADJUSTMENT INSTRUCTIONS General Note: "CBA" is an abbreviation for Head Switching Position Adjustment "Circuit Board Assembly." Purpose: NOTE: To determine the Head Switching point during 1.Electrical adjustments are required after replacing playback. circuit components and certain mechanical parts. Symptom of Misadjustment: It is important to do these adjustments only after all repairs and replacements have been com- May cause Head Switching noise or vertical jitter...

  • Page 21: Adjustment Points And Test Points

    Comparison Chart of : Indicates a test point with a jumper wire across a hole in the PCB. Models and Marks Model Mark TEST POINTS NOT USED IN ELECTRICAL ADJUSTMENTS VR340/55 Test Point Used in: Page No. VR340/75 2-3-3, 2-3-4...

  • Page 22: Block Diagrams

    HOLES OF THE PCB. :USED TO INDICATE A TEST POINT WITH A TEST PIN. (WIRE IS SOLDERED DIRECTLY.) Model Mark IC501 SW1 CBA AL+5V TP501 VR340/55 (SERVO/SYSTEM CONTROL) CL509 MAIN CBA 1 POWER VR340/75 CTL AMP OUT SWITCH TP507 SW507...
  • Page 23 :USED TO INDICATE A TEST POINT WITH NO TEST PIN. Model Mark HOLES OF THE PCB. :USED TO INDICATE A TEST POINT WITH A TEST PIN. REC-VIDEO SIGNAL PB-VIDEO SIGNAL MODE: SP/REC VR340/55 (WIRE IS SOLDERED DIRECTLY.) VR340/75 TP751 IC501 (OSD) MAIN CBA V-OUT VR740/55...
  • Page 24 :INDICATES A TEST POINT WITH A JUMPER WIRE ACROSS A HOLE IN THE PCB. (CAN DISCONNECT AND RECONNECT.) :USED TO INDICATE A TEST POINT WITH A COMPONENT LEAD ON FOIL SIDE. VR340/55 2. PREFIX SYMBOL "CL" MEANS WIRE-SOLDER :USED TO INDICATE A TEST POINT WITH NO TEST PIN.
  • Page 25 NOTE FOR WIRE CONNECTORS: TEST POINT INFORMATION 1. PREFIX SYMBOL "CN" MEANS CONNECTOR. VR340/55 :INDICATES A TEST POINT WITH A JUMPER WIRE ACROSS A HOLE IN THE PCB. (CAN DISCONNECT AND RECONNECT.) :USED TO INDICATE A TEST POINT WITH A COMPONENT LEAD ON FOIL SIDE.
  • Page 26 GND as a common terminal. Model Mark 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. VR340/55 VR340/75 VR740/55 MAIN CBA VR740/75 HOT CIRCUIT.

  • Page 27: Schematic Diagrams / Cba's And Test Points

    SCHEMATIC DIAGRAMS / CBA'S AND TEST POINTS Standard Notes Notes: WARNING 1. Do not use the part number shown on these draw- ings for ordering. The correct part number is Many electrical and mechanical parts in this chassis shown in the parts list, and may be slightly different have special characteristics.

  • Page 28: Main 1/5 Schematic Diagram Parts Location Guide

    Main 1/5 Schematic Diagram Parts Location Guide Ref No. Position Ref No. Position Ref No. Position CAPACITORS CAPACITORS RESISTORS C501 C858 R524 C503 C859 R525 C506 C862 R526 C508 DIODES R527 C510 D501 R528 C511 D502 R529 C512 R530 C513 IC501 R533 C514...

  • Page 29: Main 1/5 Schematic Diagram

    KEY 1 (7 PIN) KEY 2 (8 PIN) REC MODE MODEL MARK 0.00 ~ 0.51V POWER STOP/EJECT (2.5) VR340/55 0.51 ~ 0.92V CH DOWN INDICATES THAT THE VOLTAGE THE SAME VOLTAGE FOR VR340/75 0.92 ~ 1.27V CH UP PLAY IS NOT CONSISTENT HERE.

  • Page 30: Main 2/5 & Sensor & Sw1 & Sw2 Schematic Diagram

    Comparison Chart of MODE: SP/REC “ “ = SMD PLAY MODE Models and Marks REC MODE (2.5) MODEL MARK VR340/55 INDICATES THAT THE VOLTAGE THE SAME VOLTAGE FOR VR340/75 IS NOT CONSISTENT HERE. BOTH PLAY & REC MODES. VR740/55 VR740/75 1-11-5 1-11-6...

  • Page 31: Main 2/5 Schematic Diagram Parts Location Guide

    MAIN 2/5 Schematic Diagram Parts Location Guide Ref No. Position Ref No. Position CAPACITORS RESISTORS C537 R542 C540 R543 C541 R544 C551 R545 C552 R546 C561 R547 C701 R548 C703 R549 C704 R566 C710 R706 C711 R707 C716 R714 C717 R751 C721 R752...

  • Page 32: Main 3/5 Schematic Diagram Parts Location Guide

    MAIN 3/5 Schematic Diagram Parts Location Guide Ref No. Position Ref No. Position Ref No. Position Ref No. Position CAPACITORS CAPACITORS COILS RESISTORS C253 C342 L306 R323 C255 C344 L308 R324 C256 C345 L403 R325 C301 C346 TRANSISTORS R327 C302 C348 Q301 R328...

  • Page 33: Main 3/5 Schematic Diagram

    Comparison Chart of MODE: SP/REC “ “ = SMD PLAY MODE Models and Marks REC MODE (2.5) MODEL MARK VR340/55 THE SAME VOLTAGE FOR INDICATES THAT THE VOLTAGE VR340/75 IS NOT CONSISTENT HERE. BOTH PLAY & REC MODES. VR740/55 VR740/75 1-11-9 1-11-10...

  • Page 34: Main 4/5 Schematic Diagram

    PLAY MODE For continued protection against fire hazard, Fixed voltage ( or Auto voltage selectable ) power supply circuit is used in this unit. VR340/55 REC MODE replace only with the same type fuse. If Main Fuse (F1001) is blown, check to see that all components in the power supply VR340/75 (2.5)

  • Page 35: Main 4/5 Schematic Diagram Parts Location Guide

    MAIN 4/5 Schematic Diagram Parts Location Guide Ref No. Position Ref No. Position Ref No. Position CAPACITORS DIODES RESISTORS C001 D019 R010 C003 D021 R011 C004 D022 R012 C005 D052 R013 C006 D055 R014 C007 D056 R015 C008 D058 R016 C010 D059 R020...

  • Page 36: Main 5/5 Schematic Diagram Parts Location Guide

    MAIN 5/5 Schematic Diagram Parts Location Guide Ref No. Position Ref No. Position CAPACITORS CAPACITORS C451 C477 C452 C478 C453 C454 IC451 C455 RESISTORS C456 R451 C457 R452 C458 R453 C459 R454 C461 R455 C462 R456 C463 R458 C464 R459 C465 R460 C466...

  • Page 37: Main 5/5 Schematic Diagram (C,D)

    Main 5/5 Schematic Diagram ( C, D ) Comparison Chart of Models and Marks MODEL MARK VR340/55 VR340/75 VR740/55 VR740/75 “ “ = SMD MODE: SP/REC PLAY MODE REC MODE (2.5) INDICATES THAT THE VOLTAGE THE SAME VOLTAGE FOR BOTH PLAY & REC MODES.

  • Page 38: Afv Schematic Diagram (C,D)

    REC MODE Models and Marks (2.5) MODEL MARK INDICATES THAT THE VOLTAGE THE SAME VOLTAGE FOR IS NOT CONSISTENT HERE. BOTH PLAY & REC MODES. VR340/55 VR340/75 VR740/55 VR740/75 AFV Schematic Diagram Parts Location Guide Ref No. Position CAPACITORS CONNECTORS...

  • Page 39: Main Cba Top View

    Main CBA Top View CAUTION ! CAUTION ! BECAUSE A HOT CHASSIS GROUND IS PRESENT IN THE POWER For continued protection against fire hazard, Fixed voltage ( or Auto voltage selectable ) power supply circuit is used in this unit. SUPPLY CIRCUIT , AN ISOLATION TRANSFORMER MUST BE USED.

  • Page 40: Main Cba Bottom View

    Main CBA Bottom View CAUTION ! BECAUSE A HOT CHASSIS GROUND IS PRESENT IN THE POWER CAUTION ! For continued protection against fire hazard, SUPPLY CIRCUIT , AN ISOLATION TRANSFORMER MUST BE USED. Fixed voltage ( or Auto voltage selectable ) power supply circuit is used in this unit. replace only with the same type fuse.

  • Page 41: Main Cba Parts Location Guide

    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...
  • Page 42 AFV CBA Bottom View SW1 CBA Bottom View AFV CBA Top View SW1 CBA Top View BHE274F01011C BHC400F01091 SW2 CBA Top View SW2 CBA Bottom View AFV CBA Parts Location Guide Ref No. Position Ref No. Position CAPACITORS CONNECTORS DIODES COILS RESISTORS CRYSTAL OSCILLATORS...

  • Page 43: Waveforms

    WAVEFORMS (TP751 of Main CBA) V-OUT E-E 10usec 50mV x 10 (TP751 of Main CBA) UPPER (TP502 of Main CBA) LOWER V-OUT 0.1V x 10 RF-SW 0.5V x 10 50usec (TP301 of Main CBA) UPPER (TP502 of Main CBA) LOWER C-PB 10mV x 10 RF-SW...

  • Page 44: Wiring Diagram

    AUDIO AUDIO VIDEO AUDIO AUDIO HOLES OF THE PCB. IN (R) IN (L) IN (L) IN (R) OUT (L) OUT (R) VR340/55 (WIRE IS SOLDERED DIRECTLY.) VR340/75 VR740/55 VR740/75 SENSOR CBA (BHB300F01014) AC CORD SENSOR CBA (BHB300F01014) (DECK ASSEMBLY) ANT-IN...

  • Page 45: System Control Timing Charts

    SYSTEM CONTROL TIMING CHARTS Mode SW : LD-SW LD-SW Position detection A/D Input voltage Limit Symbol (Calculated voltage) 3.76V~4.50V (4.12V) 4.51V~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) 1.51V~1.98V (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) Note: Note : RS: Loading FWD (LM-FWD “H”, LM-REV “L”)
  • Page 46 [ VR340/ (55, 75) ] EJECT ST-S/ END-S "OFF" CASS.LOAD LD-FWD 0.2S LD-REV 0.7S LD-FWD 0.4S LD-FWD 0.5S LD-REV STOP(A) PLAY LD-FWD PLAY LD-FWD LD-REV 0.2S LD-FWD PLAY PLAY PAUSE STILL PAUSE NOISE CANCEL PAUSE STILL PAUSE NOISE CANCEL PAUSE STILL PLAY PLAY...
  • Page 47 STOP(A) STOP LD-REV 0.2S LD-FWD STOP /EJECT LD-FWD 2.5S LD-FWD 0.5S LD-REV STOP(A) LD-REV 0.2S LD-FWD STOP /EJECT LD-FWD 2.5S LD-FWD 0.5S LD-REV STOP(A) LD-FWD PAUSE LD-FWD 2.5S Short REV LD-REV 0.2S LD-FWD REC PAUSE REC or PAUSE STOP /EJECT LD-FWD 1.0S LD-REV...
  • Page 48 [ VR740/ (55, 75) ] Still/Slow Control Frame Advance Timing Chart 1) SP Mode 18 RF-SW The first rise of RF-SW after a rise in F-AD signal F-AD (Internal Signal) "H" "H" "Z" C-DRIVE "L" "L" Stop detection (T2) Acceleration Detection (T1) Slow Tracking Value PB CTL Reversal Limit Value...
  • Page 49 2) LP/SLP Mode 18 RF-SW The first rise of RF-SW after a rise in F-AD signal F-AD (Internal Signal) "H" "H" "Z" C-DRIVE "L" "L" Stop detection (T2) Acceleration Detection (T1) Slow Tracking Value PB CTL Reversal Limit Value 20ms 78 C-F/R 16 H-A-SW 15 ROTA...
  • Page 50 EJECT ST-S/ END-S "OFF" CASS.LOAD LD-FWD 0.2S LD-REV 0.7S LD-FWD 0.4S LD-FWD 0.5S LD-REV STOP(A) PLAY LD-FWD PLAY LD-FWD LD-REV 0.2S LD-FWD PLAY PLAY PAUSE (SLOW) LD-FWD STILL(SLOW) PLAY LD-REV 0.2S LD-FWD PLAY STOP /EJECT LD-REV STOP(A) Fig. 5 1-14-6 HE274TI...
  • Page 51 STOP(A) STOP LD-REV 0.2S LD-FWD STOP /EJECT LD-FWD 2.5S LD-FWD 0.5S LD-REV STOP(A) LD-REV 0.2S LD-FWD STOP /EJECT LD-FWD 2.5S LD-FWD 0.5S LD-REV STOP(A) LD-FWD PAUSE LD-FWD 2.5S Short REV LD-REV 0.2S LD-FWD REC PAUSE REC or PAUSE STOP /EJECT LD-FWD 1.0S LD-REV...

  • Page 52: Ic Pin Function Descriptions

    IC PIN FUNCTION DESCRIPTIONS Comparison Chart of Models and Marks Signal Active Mark Function Name Level Model Mark N.U. Not Used VR340/55 Video Head C,D OUT H-A-SW Amp Switching VR340/75 Pulse VR740/55 N.U. Not Used VR740/75 Head Amp H-A- Comparator...
  • Page 53 Signal Active Signal Active Mark Function Mark Function Name Level Name Level N.U. Not Used Main Clock P-ON-L Power On X-IN Input Signal at Low Main Clock LED Clock OUT X-OUT OUT DRV- Input Driver IC DATA Control Data Vss(GND) LED Clock OUT DRV- N.U.
  • Page 54 Signal Active Mark Function Name Level Capstan Motor Rotation PULSE C-FG Detection Pulse AMPVs AMPVss N.U. Not Used Drum Motor Phase/ PULSE D-PFG Frequency Generator AMPVR V-Ref for CTL EF OUT AMPVR V-Ref for CTL P80/C P80/C Terminal Playback/ OUT CTL (-) Record Control Signal (-) Playback/...

  • Page 55: Lead Identifications

    LEAD IDENTIFICATIONS 2SC1815-BL(TPE2) BN1F4M-T 2SC1815-Y(TPE2) BA1F4M-T 2SC1815-GR(TPE2) KTA1266(GR) 2SC2120-Y(TPE2) KTC3199(Y,GR,BL) KTC3203(Y) 2SC2785(J.H.F.K) 2SC1815-BL(TPE2) KRA103M 2SA1015-GR(TPE2) KRC103M E C B E C B LA71586M QSZAA0RMB145 LTV-817(B.C)-F CAT24WC02JI EL817(A,B,C) BR24C02F-W LA72638M RN1511(TE85R) KTC3879Y-RTK FMG4A T148 KTC3875Y-RTK B1 E B2 2SK3566 PT204-6B-12 PT-6958-FN-TP MID-32A22 Note: A: Anode...

  • Page 56: Electrical Parts List

    PRODUCT SAFETY NOTE: Products marked with a h 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. NOTES: Parts that not assigned part numbers (-----------) are not available.
  • Page 57 ELECTRICAL PARTS LIST Pos. 12 NC Description C303 ELECTROLYTIC CAP. 1UF/50V M H7 C304 ELECTROLYTIC CAP. 100UF/6.3V H7 C305 CHIP CERAMIC CAP. F Z 0.1UF/50V C306 CHIP CERAMIC CAP. B K 0.01UF/50V C307 CHIP CERAMIC CAP. CH J 27PF/50V C308 CHIP CERAMIC CAP.
  • Page 58 ELECTRICAL PARTS LIST Pos. 12 NC Description C430 CHIP CERAMIC CAP. F Z 0.1UF/50V C451 ELECTROLYTIC CAP. 10UF/16V M H7 C452 ELECTROLYTIC CAP. 1UF/50V M H7 C453 ELECTROLYTIC CAP. 22UF/10V M H7 C454 ELECTROLYTIC CAP. 4.7UF/25V M H7 C455 CHIP CERAMIC CAP. B K 0.01UF/50V C456 ELECTROLYTIC CAP.
  • Page 59 ELECTRICAL PARTS LIST Pos. 12 NC Description C716 CHIP CERAMIC CAP. F Z 0.22UF/16V C717 CHIP CERAMIC CAP. F Z 0.22UF/16V C721 CERAMIC CAP.(AX) Y M 0.01UF/16V C722 CERAMIC CAP.(AX) B K 1000PF/50V C723 ELECTROLYTIC CAP. 1UF/50V M C751 CHIP CERAMIC CAP. B K 2200PF/50V C751 CHIP CERAMIC CAP.
  • Page 60 ELECTRICAL PARTS LIST Pos. 12 NC Description JK753 4822 265 11659 RCA JACK(YELLOW) MSP-281V4-B JK754 4822 265 11661 RCA JACK(WHITE) MSP-281V1-B JK755 9965 000 00423 RCA JACK(RED) MSP-281V3-A L003 9965 000 09297 LINE FILTER 33MH SA-01021 L010 9965 000 05627 CHOKE COIL 47UH-K L012 9965 000 13681 INDUCTOR 100UH-J-5FT L052...
  • Page 61 ELECTRICAL PARTS LIST Pos. 12 NC Description R012 CARBON RES. 1/4W J 390K OHM R013 CARBON RES. 1/6W J 470K OHM R014 CARBON RES. 1/6W J 47K OHM R014 CARBON RES. 1/6W J 100K OHM R015 CHIP RES.(1608) 1/10W J 10K OHM R016 CHIP RES.(1608) 1/10W J 100K OHM R020...
  • Page 62 ELECTRICAL PARTS LIST Pos. 12 NC Description R334 CHIP RES.(1608) 1/10W J 1.8K OHM R335 CHIP RES.(1608) 1/10W J 1.2K OHM R336 CHIP RES.(1608) 1/10W J 8.2K OHM R340 CHIP RES.(1608) 1/10W J 6.8K OHM R344 CHIP RES.(1608) 1/10W J 220 OHM R372 CARBON RES.
  • Page 63 ELECTRICAL PARTS LIST Pos. 12 NC Description R520 CHIP RES.(1608) 1/10W J 10K OHM R521 CHIP RES.(1608) 1/10W J 220K OHM R522 CHIP RES.(1608) 1/10W J 39K OHM R523 CHIP RES.(1608) 1/10W J 10K OHM R524 CHIP RES.(1608) 1/10W J 10K OHM R525 CHIP RES.(1608) 1/10W J 1.5K OHM R526...
  • Page 64 ELECTRICAL PARTS LIST Pos. 12 NC Description SW512 4822 276 13954 TACT SWITCH KSM0614B T001 9965 000 16627 SWITCHING TRANSFORMER CSA-SW0233A T001 9965 000 17327 SWITCHING TRANSFORMER CSA-SW0253C TP301 PCB JUMPER D0.6-P10.0 TP501 PCB JUMPER D0.6-P6.0 TP502 PCB JUMPER D0.6-P9.0 TP505 PCB JUMPER D0.6-P5.0 TP507...

  • Page 65: Exploded Views

    EXPLODED VIEWS Front Panel [ VR340/ (55, 75) ] [ VR740/ (55, 75) ] 1-18-1 HE274FEX...
  • Page 66 Cabinet 2L011 2L011 2L011 Comparison Chart of Models and Marks Model Mark VR340/55 VR340/75 VR740/55 [ A,B ] VR740/75 [ C,D ] 2L021 2L021 2L021 2L021 2B40 2L021 SENSOR CBA [ C,D ] 2B34 AFV CBA 2L031 SW1 CBA 2B40...
  • Page 67 Some Ref. Numbers are not in sequence. Packing [ A,C ] [ B,D ] X20A X20B X20C X20D Comparison Chart of Unit Models and Marks Model Mark VR340/55 VR340/75 VR740/55 VR740/75 1-18-3 HE274PEX...
  • Page 68 PRODUCT SAFETY NOTE: Products marked with a h 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 Pos.
  • Page 69 DECK MECHANISM SECTION VIDEO CASSETTE RECORDER Sec. 2: Deck Mechanism Section I Standard Maintenance I Mechanism Alignment Procedures I Disassembly / Assembly of Mechanism I Deck Exploded Views I Deck Parts List TABLE OF CONTENTS STANDARD MAINTENANCE ............. . 2-1-1 SERVICE FIXTURE AND TOOLS .

  • Page 70: Standard Maintenance

    STANDARD MAINTENANCE Service Schedule of Components H: Hours : Check I: Change Deck Periodic Service Schedule Ref.No. Part Name 1,000 H 2,000 H 3,000 H 4,000 H Cylinder Assembly Loading Motor Assembly Pulley Assembly B587 Tension Lever Assembly AC Head Assembly B573,B574 Reel (SP)(D2), Reel (TU)(D2) Capstan Motor...
  • Page 71 Cleaning Cleaning of Audio Control Head Clean the head with a cotton swab. Cleaning of Video Head Procedure Clean the head with a head cleaning stick or chamois 1.Remove the top cabinet. cloth. 2.Dip the cotton swab in 90% isopropyl alcohol and Procedure clean the audio control head.

  • Page 72: Service Fixture And Tools

    SERVICE FIXTURE AND TOOLS J-1-1, J-1-2 Ref. No. Name Part No. Adjustment J-1-1 Alignment Tape FL6A Electrical Adjustments J-1-2 Alignment Tape FL6N8 Azimuth and X Value Adjustment of Audio Control (2 Head model) Head / Adjustment of Envelope Waveform FL6NS8 (4 Head model) Guide Roller Adj.Screwdriver Available...

  • Page 73: Mechanical Alignment Procedures

    MECHANICAL ALIGNMENT PROCEDURES Explanation of alignment for the tape to correctly run B. Method to place the Cassette Holder in the tape- starts on the next page. Refer to the information below loaded position without a cassette tape on this page if a tape gets stuck, for example, in the 1.
  • Page 74 1.Tape Interchangeability Alignment 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-C, step 2.) Equipment required: Dual Trace Oscilloscope VHS Alignment Tape (FL6NS8) Guide Roller Adj.
  • Page 75 1-A. Preliminary/Final Checking and 3. Check to see that the tape runs without creasing at Alignment of Tape Path Take-up Guide Post [4] or without snaking between Guide Roller [3] and AC Head. (Fig. M3 and M5) Purpose: 4. If creasing or snaking is apparent, adjust the Tilt To make sure that the tape path is well stabilized.
  • Page 76 6. Press CH DOWN button on the unit until the CTL 1-D. Azimuth Alignment of Audio/Con- waveform has shifted from its original position (not trol/ Erase Head the position achieved in step 5, but the position of Purpose: CTL waveform in step 4) by approximately -2msec. To correct the Azimuth alignment so that the Audio/ Make sure that the envelope is simply attenuated Control/Erase Head meets tape tracks properly.

  • Page 77: Disassembly/Assembly Procedures Of Deck Mechanism

    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;...
  • Page 78 REMOVAL INSTALLATION STEP START- REMOVE/*UNHOOK/ /LOC. PART ADJUSTMENT Fig. No. UNLOCK/RELEASE/ CONDITION UNPLUG/DESOLDER Loading Arm (TU) (+)Refer to Alignment [32] [33] DM2,DM14 Assembly Sec.Pg.2-4-9 [34] [2],[25] M Brake (TU) Assembly DM1,DM15 *(P-7), Brake Belt [35] [2],[25] M Brake (SP) Assembly DM1,DM15 *(P-8) [36] [35]...
  • Page 79 Top View [41] [42] [46] [43] [14] [13] [11] [15] [36] [10] [12] [35] [34] [40] [29] [30] [16] [39] [38] Fig. DM1 Bottom View [20] [33] [32] [24] [26] [27] [25] [23] [28] [22] [21] [31] Fig. DM2 2-4-3 U27NPCASIADA...
  • Page 80 (S-1) (S-1) (L-1) (L-3) (L-2) (P-1) Fig. DM5 [46] Fig. DM3 [47] Pin D (L-14) Pin C Pull up Slide Pin A Pin B Slot A (S-2) Slots B Slot A 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.
  • Page 81 (S-4) (S-5) [14] (S-6) [16] [15] Desolder from bottom (S-3) Lead with White Stripe Belt View for A Fig. DM7 Fig. DM9 Adj. Screw [11] [18] (L-4) (L-5) (P-3) [17] [13] [19] [12] (P-4) [10] (P-2) (S-7) Pin of [12] Pin of [10] Fig.
  • Page 82 [22] (C-4) (S-8) (C-1) [23] (L-6) [21] (P-5) [20] Cap Belt (P-5) [28] Fig. DM11 When installing [23], install the spring (P-5) to [28] as shown in the left figure, and then install [23] while Pin on pressing the spring (P-5) to bottom the direction of the arrow in of [23]...
  • Page 83 (P-6) [25] [31] Refer to the Alignment (C-3) Section, Page 2-4-9. (S-9) [29] [33] [30] (L-11) [32] (L-10) (L-8) (C-2) [27] [28] [24] [26] (L-9) Fig. DM14 Position of Mode Lever when installed [36] Break belt Pin of [35] (P-7) Pin of [31] Pin of [34] [34]...
  • Page 84 [42] [41] [43] (L-13) Fig. DM16 [44] [45] Slide Fig. DM17 2-4-8 U27NPCASIADA...

  • Page 85: Alignment Procedures Of Mechanism

    ALIGNMENT PROCEDURES OF MECHANISM The following procedures describe how to align the Alignment 1 individual gears and levers that make up the tape load- Loading Arm (SP) and (TU) Assembly ing/unloading mechanism. Since information about the state of the mechanism is provided to the System Install Loading Arm (SP) and (TU) Assembly so Control Circuit only through the Mode Switch, it is that their triangle marks point to each other as...

  • Page 86: Deck Exploded Views

    DECK EXPLODED VIEWS Deck Mechanism View 1 Mark Description Floil G-684G or Multemp MH-D (Blue grease) SLIDUS OIL #150 B494 L1467 L1191 B553 B411 B567 L1053 B410 L1051 Chassis Assembly Top View (Lubricating Point) B501 B560 L1450 L1450 B426 L1466 B121 B126 B492...
  • Page 87 B574 B558 B564 B557 B414 B565 B525 L1151 B417 Comparison Chart of Models and Marks B568 Model Mark B134 VR340/55 VR340/75 B133 VR740/55 VR740/75 B593 B569 [ A,B ] [ C,D ] B491 B488 Bottom Side B559 B570 (Grease point)
  • Page 88 Deck Mechanism View 3 Mark Description Floil G-684G or Multemp MH-D (Blue grease) SLIDUS OIL #150 L1321 B347 L1321 B355 B354 B483 B425 B482 B562 B300 B563 B313 B529 B360 B359 B361 B555 B303 Some Ref. Numbers are not in sequence. B514 2-5-3 UHE274DEX...

  • Page 89: Deck Parts List

    DECK PARTS LIST Pos. 12 NC Description 9965 000 17189 CYLINDER ASSEMBLY MK12 PAL 2HD 2SP 9965 000 16630 CYLINDER ASSEMBLY MK12 PAL 4HD HIFI 9965 000 17190 LOADING MOTOR ASSEMBLY MK12 9965 000 17191 PULLEY ASSEMBLY MK12 9965 000 16632 MOVING GUIDE S PREPARATION MK12 9965 000 16633 MOVING GUIDE T PREPARATION MK12 9965 000 16634 LOADING ARM(TU) ASSEMBLY MK12 9965 000 16635 LOADING ARM(SP) ASSEMBLY MK12...
  • Page 90 DECK PARTS LIST Pos. 12 NC Description B560 9965 000 08522 KICK SPRING MK10 B562 9965 000 16665 C DRIVE LEVER(SP) MK12 B563 9965 000 16666 SLIDER SHAFT MK12 B564 9965 000 17205 M GEAR MK12 B565 9965 000 17206 SENSOR GEAR MK12 B567 9965 000 16669 PINCH ARM(B) MK12 B568...

This manual is also suitable for:

Vr740/55Vr340/75Vr740/75

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