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Sony BVW-55 Maintenance Manual
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Sony BVW-55 Maintenance Manual

Sony BVW-55 Maintenance Manual

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VIDEOCASSETTE RECORDER
BVW-55
MAINTENANCE MANUAL
Part 2
Volume 1 1st Edition
Serial No. 10001 and Higher

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  • Page 1 VIDEOCASSETTE RECORDER BVW-55 MAINTENANCE MANUAL Part 2 Volume 1 1st Edition Serial No. 10001 and Higher...
  • Page 2 électrique, d’incendie ou de blessure n’effectuer que les réparations indiquées dans le mode d’emploi à moins d’être qualifié pour en effectuer d’autres. Pour toute réparation faire appel à une personne compétente uniquement. BVW-55 P2...
  • Page 3 Bij dit produkt zijn batterijen geleverd. Wanneer deze leeg zijn, moet u ze niet Lithiumbatteri-Eksplosionsfare ved fejlagtig weggooien maar inleveren als KCA. håndtering. Udskiftning må kun ske med batteri af samme fabrikat og type. Levér det brugte batteri tilbage til leverandøren. 1 (P) BVW-55 P2...

  • Page 5: Table Of Contents

    2-2-4. AUDIO/VIDEO ADJUST Mode (A2)........2-21 2-2-5. BETACAM PB ADJUST Mode (A3)........2-30 2-2-6. MECHANISM ADJUST Mode (A4)........2-34 2-3. OTHERS CHECK Mode (M3) ..............2-35 2-3-1. Outline ..................2-35 2-3-2. MEMORY CHECK Display Menu (M35) ......2-36 BVW-55 P2...
  • Page 6 4-10. S Tension Regulator Arm Assembly Replacement ........4-37 4-11. T Tension Regulator Arm Assembly Replacement ........4-39 4-12. T Idler Assembly Replacement ..............4-41 4-13. Cam Gear Assembly Replacement ............4-43 4-14. Intermittent Gear Replacement ..............4-48 4-15. Fan Motor Replacement ................4-50 BVW-55 P2...
  • Page 7 5-10. AT Head Azimuth Check and Adjustment ..........5-37 5-11. AT Head Head-to-tape Contact Check ............. 5-40 6. Electrical Alignment after Replacement of Periodic Maintenance Parts (Will be avaelable as a supplement.) 7. Electrical Alignment (Will be avaelable as a supplement.) BVW-55 P2...

  • Page 9: Manual Structure

    ..Protocol Manual of Remote (9-pin) Connector (available on request) This manual explains the protocol for controlling the VTR via the RS-422A (9-pin serial remote) . If this manual is required, please contact to Sony’s service organi- zation.

  • Page 10: Contents

    Block Diagrams Describes the block diagrams of overall and each board. Section 4 Schematic Diagrams and Frame Wiring Describes the frame wiring and the schematic diagrams. Section 5 Board Layouts Describes the board layouts of printed wiring boards. BVW-55 P2...

  • Page 11: Service Overview

    2. Connect the connectors on the extension board EX-706 to the connectors on the mother board. Install the extension board EX-706 with side A in the front. 3. Connect the connectors on the plug-in board to the connectors on the extension board EX-706. BVW-55 P2...

  • Page 12: Board

    2. Remove the harnesses from the three connectors (a, b, c) on the drum assembly using a thin stick with a no sharp point. BPWH2.6 x 5 APWH2.6 x 5 Acoustic isolation plate RP-107 board BPWH2.6 x 5 CPWH2.6 x 5 CN102 RP shield plate Drum assembly BVW-55 P2...
  • Page 13 6. Connect the extension harnesses to the RP-107 board. RP-107 board CN102 Extension board EX-706 Orange Extension harness (SR66-EQ3) Blue Yellow White Extension harness (DR2) Drum assembly Extension harness (DR1) to CN7 to CN6 to CN4 to CN3 to CN2 to CN1 to CN5 Drum assembly BVW-55 P2...
  • Page 14 4. Lightly insert the RP-107 board. At this time, insert the acoustic isolation plate into the position shown in the figure. Take care not to catch the harnesses between the acoustic isolation plate and the chassis. RP-107 board Acoustic isolation plate CPWH2.6 x 5 DR2-RP6 SR66-RP6 Drum assembly DR1-RP Acoustic isolation plate Chassis BVW-55 P2...
  • Page 15 (APWH2.6 x 5). 11. Attach the upper frame. (For the installation, refer to “1-6. Removal/Installation of Cabinet” of the maintenance manual Part 1.) Acoustic isolation plate PWH2.6 x 5 PWH2.6 x 5 RP shield plate Convex portions PWH2.6 x 5 BVW-55 P2...

  • Page 16: Board

    3. Connect the harness connecting between the RP-107 and DM-121 boards to the connector (CN1). 4. Place the cushion between the DM-121 board and floor to fix the DM-121 board. Reinforcement plate (portion A) CN100 DM-121 board Side A Harness Reinforcement Cushion plate (portion A) BVW-55 P2...

  • Page 17: Fixtures And Adjustment Equipment List

    Terminator 75 Z BNC type Recording tape Sony Betacam SP tape (BCT-30MA, etc.) Sony Betacam tape (BCT-20G, etc.) *1: P2= Used in the maintenance manual Part 2. *2: Use the composite video monitor that is applicable to the places in the world.

  • Page 18: Fixtures

    Fixing position of threading gear/drawing arm when installing 16 7-432-114-11 Screw locking compound (200g) Inhibits loosening of screws 17 7-651-000-10 Sony grease SGL-601 (50 g) 7-651-000-11 Sony grease SGL-801 (50 g) P1/P2 18 7-661-018-18 Diamond oil NT-68 (50 ml) 19 7-700-751-01 Nut driver (s = 4.5 mm)
  • Page 19 1-2. Fixtures and Adjustment Equipment List BVW-55 P2...

  • Page 20: Alignment Tape

    1-3. Alignment Tape 1-3. Alignment Tape Describes the alignment tapes using for adjusting the unit. 1. CR2-1B (SONY part No. 8-960-096-01) : For 525/60 system Used for tracking adjustment. Time (min. : sec.) Video Track LTC track CTL track 00:00 -28:00 Y : 4 MHz —...
  • Page 21 1-3. Alignment Tape 4. CR8-1A (SONY part No. 8-960-097-45) : For 525/60 system Used for audio adjustment. Time (min. : sec.) LAU tracks CTL track Video 0:00 - 1 kHz sine wave, 0 VU No signal 2:55 - No signal...

  • Page 22: Disconnecting/Connecting Flexible Card Wire

    1. Insert the flexible card wire firmly as far as it will go. 2. Push portion A of the connector in the direction indicated by the arrow and lock the connector. At that time, take care that the flexible card wire is not inclined. Flexible card wire Connector 1-12 BVW-55 P2...

  • Page 23: Nv-Ram/Eeprom

    (1) Set initial values to all A37: TBC VR 1 menu items of the maintenance mode below, then adjust them. (For the setting and adjustment, refer to Section 7.) 3. IC108 on KY-446 board (1) Reset the sub-LCD menu data. (For the setting, refer to the operation manual.) 1-13 BVW-55 P2...
  • Page 24 (For the setting, refer to Section 3 in the maitenance manual. part 1.) 7. IC406 on TG-191 board (1) Adjust all A20: VPR/TG VR menu items of the maintenance mode. (For the adjustment, refer to Section 7.) 1-14 BVW-55 P2...

  • Page 25: Plcc Ic Removal

    It is recommended that the tool below is used to remove the PLCC-type IC inserted into an IC socket. Tool required Extraction tool for PLCC socket Sony part No.: J-6035-070-A This tool can be used for IC whose number of pins is 20 to 124. Procedure .

  • Page 27: Maintenance Mode

    This mode is used for checking the others. M30:ROM VERSION M31:SERIAL NUMBER M35:MEMORY CHECK M36:HOUR METER RESET M3F:MEMORY CARD UTILITY M4 : SETUP MAINTENANCE SETUP MAINTENANCE MODE This mode is used for the setup menu. M40 : EXTENDED MENU M49 : RESET ALL SETUP BVW-55 P2...
  • Page 28 (“JOG DIAL” is displayed on the LCD monitor.) The data value or setting can be changed when the JOG dial or shuttle dial (depend on search mode) is turned while pressing the 6 search button. BVW-55 P2...
  • Page 29 Location of Switches on SY-272 Board Remove the battery sub panel referring to Section 1-6-1 in the maintenance manual part 1 when operating the switches on the SY-272 board. Change the setting of DIP switch S202 with the power switch set to OFF. BVW-55 P2...
  • Page 30 (1) Press the 2 MENU button several times to display the mode screen on the LCD monitor. The selected mode No. and title are displayed in a sub LCD. (2) Press the 2 MENU button again to terminate the maintenance mode. BVW-55 P2...
  • Page 31 (menu) in the same row. Display the mode (menu) which you wish C0 -SERV O CHECK C2 -AUDI O/VIDEO to open and press the SET button. Turn JOG dial The mode (menu) is then opened. Example in sub LCD BVW-55 P2...

  • Page 32: Tape Maintenance Mode (M0)

    This unit has the seven submodes below. TAPE MAINTENANCE MODE C0 : SERVO CHECK C2 : AUDIO/VIDEO CHECK A0 : SERVO ADJUST A1 : BETACAM REC ADJUST A2 : AUDIO/VIDEO ADJUST A3 : BETACAM PB ADJUST A4 : MECHANISM ADJUST TAPE Maintenance Mode BVW-55 P2...
  • Page 33 & FG CHECK [MENU] C2 : AUDIO/VIDEO CHECK This submode is used to check the audio and video systems. For more details, refer to the maintenance manual part 1. AUDIO/VIDEO CHECK MODE C21:VIDEO TEST SG C22:MULTI LOOP(10TIMES) C23:AUDIO TEST SG BVW-55 P2...
  • Page 34 Adjusts the modulator circuit (metal mode). A19 : MODULATOR VR 2 2-19 Adjusts the modulator circuit (oxide mode). A1A : MODULATOR VR 3 2-19 Adjusts the modulator circuit (input level). A1F : NV-RAM CONTROL 2-20 Saves the adjustment data in a recording system. BVW-55 P2...
  • Page 35 A26 : DEC VR (LOOP) 2-27 Adjusts the composite video input (in the multi-loop state). A27 : VIDEO METER 2-27 Calibration of video meter on the sub LCD. A2F : NV-RAM CONTROL 2-29 Saves the adjustment data in audio and video systems. BVW-55 P2...
  • Page 36 This submode is used to adjust the mechanism part. For more details, refer to Section 2-2-6. MECHANISM ADJUST A40:PATH MODE SEL Title Page Description A40 : PATH MODE SEL 2-34 Sets the tape PB mode (Used for tape transport adjustment). 2-10 BVW-55 P2...

  • Page 37: Servo Adjust Mode (A0)

    A00-01 : SERVO ADJUST SERVO ADJUST A000:A001-A003 ADJ. A001:S REEL FG DUTY A002:CAPSTAN FG DUTY A003:CAPSTAN FRICTION A004:CAPSTAN SPEED A005:RF SWITCHING POS. A006:NV-RAM CONTROL 2-11 BVW-55 P2...
  • Page 38 SAVE SERVO ADJUST Confirm data in an A006 : NV-RAM CONTROL menu. [MENU] Data save A006:NV-RAM CONTROL SERVO ADJUST A001-003:AUTO ADJUST A001:S REEL FG DUTY # ADJUST INCOMPLETE # # S REEL TROUBLE Ex.: When failing the automatic adjustment 2-12 BVW-55 P2...
  • Page 39 (4) To save the adjustment data in the NV-RAM of a servo system, execute the SAVE SERVO ADJUST data in an A006 : NV-RAM CONTROL menu. SERVO ADJUST A001:S REEL FG DUTY # ADJUST INCOMPLETE # # S REEL TROUBLE Ex.: When failing the automatic adjustment 2-13 BVW-55 P2...
  • Page 40 (3) Press the MENU button to terminate the menu. (4) To save the adjustment data in the NV-RAM of a servo system, execute the SAVE SERVO ADJUST data in an A006 : NV-RAM CONTROL menu. 2-14 BVW-55 P2...
  • Page 41 SAVE SERVO ADJUST PG DATA:BDF7 data in an A006 : NV-RAM CONTROL menu. Confirm [MENU] Data save A006:NV-RAM CONTROL SERVO ADJUST A005:RF SWITCHING POS. # ADJUST INCOMPLETE # PG DATA:C000 When failing the automatic adjustment 2-15 BVW-55 P2...
  • Page 42 Check the capstan FG amplifier circuit and CTL amplifier circuit on the SV-206 board. When “CAPSTAN DRIVER TROUBLE” is displayed Check the capstan motor driver circuit on the SV-206 board. A005 : RF SWITCHING POS. Confirm that the played back tape is alignment tape CR2-1B. 2-16 BVW-55 P2...
  • Page 43 A006:NV-RAM CONTROL “DATA SAVED” is displayed on the LCD monitor NO OPERATION SAVE SERVO ADJUST DATA and “A0061 10” is displayed in the sub LCD. (4) Press the MENU button to terminate the menu. DATA SAVED Confirm [MENU] 2-17 BVW-55 P2...

  • Page 44: Betacam Rec Adjust Mode (A1)

    Execute ALL DATA PREVIOUS in A1F : NV-RAM CONTROL menu. The current adjustment data can not return to the former state after executing SAVE ALL ADJUST DATA. To save the adjustment data Execute SAVE ALL ADJUST DATA in A1F:NV-RAM CONTROL. 2-18 BVW-55 P2...
  • Page 45 OXIDE-C HF SLICE A1A : MODULATOR VR 3 This menu is used to adjust the modulator circuit of the video level (MD-122 board). Example of display BETACAM REC ADJUST MODE A1A:MODULATOR VR3 DEC Y LEVEL DEC C LEVEL 2-19 BVW-55 P2...
  • Page 46 . After data transmission is completed, message “Save Complete” or “Load Complete” is displayed on the LCD monitor, and message “SAVE COM- PLETE” or “LOAD COMPLETE” is displayed in the sub LCD. (4) Press the MENU button to terminate the menu. 2-20 BVW-55 P2...

  • Page 47: Audio/Video Adjust Mode (A2)

    To return the adjustment data to the former state Execute ALL DATA PREVIOUS in an A2F : NV-RAM CONTROL menu. The current adjustment data can not return to the former state after executing SAVE ALL DATA ADJUST DATA. 2-21 BVW-55 P2...
  • Page 48 This submenu is used for an SDI input interface (SDI 60 and 625/50 systems. decoder). Adjustment item Description When select this submenu, mute the SDI input signal. VIDEO 1/2 LEVEL Composite video output (1/2) level INT 4FSC FREQ Free-running frequency of internal reference signal 4fsc 2-22 BVW-55 P2...
  • Page 49 * mark to line 1 on the LCD monitor. (In a sub LCD, “MANUAL” or “PUSH SET” is displayed.) (ii) Turn the JOG dial while pressing the Search button. Manual 8 Automatic: [Search] + DIAL (2) Manual 7 Automatic: [Search] + DIAL (3) 2-23 BVW-55 P2...
  • Page 50 (for A231 : SDI ENC VCO) or at TP200 on the SDI-23 * A2F:NV-RAM CONTROL board (for A232: SDI DEC VCO) using the frequency counter. For the manual adjustment, refer to the “To change the adjustment data manually” on page 2-21. 2-24 BVW-55 P2...
  • Page 51 3 Each status is displayed as “0” or “1”. 0: When the specification is not satisfied 1: When the specification is satisfied (For SFTP, the status is displayed in alternate “0” and “1” when the specification is satisfied.) 2-25 BVW-55 P2...
  • Page 52 Confirm the adjustment data range in which the SCH status is set to “1” and set the adjustment data to the intermediate value when performing the manual adjustment. For the manual adjustment, refer to the “To change the adjustment data manually” on page 2-21. 2-26 BVW-55 P2...
  • Page 53 625/50 systems. Adjustment item Test signal VIDEO GAIN 100% Color Bars The adjustment data in an A26 : DEC VR (LOOP) menu is used in common with the same adjustment item in an A25 : DEC VR menu. 2-27 BVW-55 P2...
  • Page 54 SX 60 BATT 01 : 23 : 45 : 01 when performing the manual adjustment. AU 1 VITC ON PAGE For the manual adjustment, refer to the “To change the adjustment data manually” on page 2-21. Sub LCD 2-28 BVW-55 P2...
  • Page 55 . After data transmission is completed, message “Save Complete” or “Load Complete” is displayed on the LCD monitor, and message “SAVE COM- PLETE” or “LOAD COMPLETE” is displayed in Confirm the sub LCD. [MENU] (4) Press the MENU button to terminate the menu. 2-29 BVW-55 P2...

  • Page 56: Betacam Pb Adjust Mode (A3)

    * mark to the adjustment item. Turn the JOG dial in the sub LCD and display the item to be adjusted. (2) Turn the JOG dial while pressing the search button. The adjustment data then increases or decreases. 2-30 BVW-55 P2...
  • Page 57 MAIN METAL-Y-B MAIN METAL-C-A GUARD BAND METAL-Y MAIN METAL-C-B GUARD BAND METAL-C MAIN OXIDE-Y-A GUARD BAND OXIDE-Y MAIN OXIDE-Y-B GUARD BAND OXIDE-C MAIN OXIDE-C-A OMC DC METAL-Y MAIN OXIDE-C-B OMC DC METAL-C OMC DC OXIDE-Y OMC DC OXIDE-C 2-31 BVW-55 P2...
  • Page 58 PB VISC phase detection circuit on the DM-121 board. The adjustment item is provided proportionally to the number of video channels (Y and C) for read clock timing setting. Example of display BETACAM PB ADJUST MODE A37:TBC VR1 SQ-Y RZ SQ-C-RZ VISC PHASE 2-32 BVW-55 P2...
  • Page 59 . After data transmission is completed, message “Save Complete” or “Load Complete” is displayed on the LCD monitor, and message “SAVE COM- PLETE” or “LOAD COMPLETE” is displayed in Confirm the sub LCD. [MENU] (4) Press the MENU button to terminate the menu. 2-33 BVW-55 P2...

  • Page 60: Mechanism Adjust Mode (A4)

    However, character information (time code or operation status) superimposed during ordinary operation is not displayed. To return to the former state, press the MENU button. For the video tracking confirmation and adjustment, refer to “5-5. Video Tracking Confirmation and Adjustment”. 2-34 BVW-55 P2...

  • Page 61: Others Check Mode (M3)

    Displays and resets the resettable hours meter and thread counter. (Refer to the maintenance manual part 1.) M3F : MEMORY CARD UTILITY — Uploads and downloads the software using the memory card box. This unit is not ready for “M3F : MEMORY CARD UTILITY” yet. 2-35 BVW-55 P2...

  • Page 62: Memory Check Display Menu (M35)

    However, the character information (time code or opera- tion status) superimposed during ordinary operation is not displayed. To return to the former state, press the MENU button. 2-36 BVW-55 P2...
  • Page 63 S main brake shoe 3-12 T tension regulator arm 4-11 Capstan motor 3-13 T idler 4-12 S reel motor 3-14 Cam gear 4-13 AT head 3-15 Intermittent gear 4-14 : Refer to the Mechanical Part Replacement in Section 4. BVW-55 P2...

  • Page 64: General Information On Parts Replacement And Alignment

    Clean the surface of tools before using them. . Cleaning cloth (15 cm x 15 cm) : 3-184-527-01 . Cleaning liquid: 9-919-573-01 Take care not to damage the tool when handling it. If damaged tool is used, the correct adjustment may not be carried out. BVW-55 P2...

  • Page 65: Threading End And Unthreading End States

    To enter the threading end state manually Turn the manual eject knob clockwise. Stop the rotation of the manual eject knob if the mechanical deck is in the above mentioned threading end state. If not, the related gears may be damaged. BVW-55 P2...
  • Page 66 (5) Put the cassette tape without lid on the mechanical deck and put a weight. Reference . Use a weight of about 1000 g. . As for how to remove a lid from the cassette tape, refer to section 5-1. S100 switch Cassette tape without lid Weight (about 1000 g) BVW-55 P2...
  • Page 67 If not, related gears may be damaged. . As for how to enter the unthreading end state with the cassette tape inserted, refer to the maintenance manual Part 1, Section 1-11. S100 switch Manual eject knob BVW-55 P2...

  • Page 68: Oil And Grease

    Stick (2 mm dia.) Pulling up Dip into oil vertically Oil (5 mm in depth) <A quarter of one drop> A quarter of one drop Stick (0.3 mm dia.) Pulling up Dip into oil vertically Oil (5 mm in depth) BVW-55 P2...

  • Page 69: Tightening Torque And Washer

    (2) Put the thin tip of the tool on the top of the shaft to be installed in a upright position. (3) Push the tool downward and install the stop Stop washer washer to the shaft. Stop washer BVW-55 P2...

  • Page 70: Display Panel Cover Removal And Installation

    3. Close the display panel once, then remove the display panel cover in the upper direction. Display panel caver 4. Reinstall the display panel cover in the reverse order of removal. Being careful not to pinch the harnesses nearby the inverter, reinstall the panel. BVW-55 P2...

  • Page 71: Control Panel Removal And Installation

    5. Remove the six claws on the control panel, then remove the control panel in the direction indicated by the arrow. Control panel Flatblade screwdriver Hole Claws Hook Claws BVTT3 x 8 Claws 6. Install the control panel in the reverse order of removal. BVW-55 P2...

  • Page 72: Mechanical Deck Assembly Removal And Installation

    5. Put the unit back to the original position. Reference The frame has four feet, therefore, the unit can be put the original position even if there is no bottom plate. CN301, CN302, CN303 Feet Feet CN901 SV-206 board Feet 3-10 BVW-55 P2...
  • Page 73 The drum is protected by the cassette compartment and manual eject knob. Hexagon cap screw Brush connector Hexagon cap screw Hexagon cap screws (Loosen) AT head harness Hexagon cap screws (Loosen) Hexagon cap screw Hexagon cap screw AU-262 board CN300 3-11 BVW-55 P2...
  • Page 74 . CN707 (Full top sensor harness) Reference Remove the cassette compartment once during harness removal. This facilitates the removal opera- tion. CN201 (Back side) CN101 CN701 CN702 CN601 CN401 CN704 CN703 CN705 CN706 CN707 CN304 (Back side) 3-12 BVW-55 P2...
  • Page 75 Perform the confirmation or adjustment below after the mechanical deck assembly is removed and installed. . Tape running check or adjustment . Video tracking check or adjustment . CTL head position check or adjustment . AT head position check or adjustment 3-13 BVW-55 P2...

  • Page 76: Upper Drum Assembly Replacement

    . Hexagon bit (Across flat has 1.5 mm): J-6326-120-A . Torque screwdriver (for 3 kg): J-6325-400-A . L-shaped wrench (Across flat has 1.5 mm): 7-700-736-05 . Cleaning cloth (15 cm x 15 cm): 3-184-527-01 . Cleaning liquid: 9-919-573-01 3-14 BVW-55 P2...
  • Page 77 L-shaped wrench and remove the upper drum assembly in the direction indicated by the arrow. Be careful not to damage the upper edge of the lower drum after the upper drum assem- bly is removed. 3-15 BVW-55 P2...
  • Page 78 Do not apply cleaning fluid to the contact pins and contact patterns. . Lower drum assembly Contact patterns (cleaning with Cleaning Contact patterns dry cloth) (cleaning with dry cloth) Contact patterns Flange (cleaning) (cleaning with dry cloth) 3-16 BVW-55 P2...
  • Page 79 (3) In the state in step (2), fix the four screws tentatively in the order shown in the figure at the torque below. [Tightening torque: 10 x 10 {1.0 kgf.cm}] (4) Tighten the four screws at the torque below. [Tightening torque: 25 x 10 {2.5 kgf.cm}] 3-17 BVW-55 P2...
  • Page 80 (Refer to Section 5-7.) 13. AT head position adjustment (Refer to Section 5-8.) 14. Drum phase adjustment (Refer to Section 6-2.) 15. PB system adjustment (Refer to Section 6-2.) 16. REC system adjustment (Refer to Section 6-2.) 3-18 BVW-55 P2...

  • Page 81: Brush Replacement

    The brush assembly can be replaced with the cassette compartment installed. Tools . Torque screwdriver bit (for M2): J-6325-380-A . Torque screwdriver (for 3 kg): J-6325-400-A Removal P2 x 2 1. Brush cover removal Remove the two screws, then remove the brush Brush cover cover. Brush assembly 3-19 BVW-55 P2...
  • Page 82 (1) and (2) while pushing the brush base in the direction indicated by arrow B. [Tightening torque: 20 x 10 {2.0 kgf.cm}] (4) Connect the harness disconnected in step (1) of procedure 2 to the connector on the brush board. 3-20 BVW-55 P2...
  • Page 83 {1.0 kgf.cm}] Be careful not to apply excessive force to the brush base. (2) Apply the screw locking compound to two Locking compound screws. (3) Recheck that the brush surely touches the grooves of the slip ring. 3-21 BVW-55 P2...

  • Page 84: Slip Ring Assembly Replacement

    . Torque screwdriver bit (for M2): J-6325-380-A . Torque screwdriver (for 3 kg): J-6325-400-A Removal 1. Brush cover removal Remove the brush cover. (Refer to Section 3-3.) 2. Brush assembly removal Remove the brush assembly. (Refer to Section 3-3.) 3-22 BVW-55 P2...
  • Page 85 (3) Connect the small relay board of the slip ring assembly to the board on the upper drum assembly. 5. Brush assembly installation Install the brush assembly. (Refer to Section 3-3.) 6. Brush cover installation Install the brush cover. (Refer to Section 3-3.) 3-23 BVW-55 P2...

  • Page 86: Drum Assembly Replacement

    (Refer to the maintenance manual Part 1, Section 1-7.) Tools . Torque screwdriver bit (for M2): J-6325-380-A . Torque screwdriver (for 3 kg): J-6325-400-A . Cleaning cloth (15 cm x 15 cm): 3-184-527-01 . Cleaning liquid: 9-919-573-01 3-24 BVW-55 P2...
  • Page 87 (CN1, CN2 and CN3) connected to the board below the drum. The drum assembly can be then removed. Be careful not to damage the CTL head, AT head, and peripheral tape guides when removing the drum assembly. 3-25 BVW-55 P2...
  • Page 88 (4) Confirm that the drum assembly is firmly inserted into the positioning pins by moving it slightly. (5) Tighten the three screws. [Tightening torque: 20 x 10 Positioning pins {2.0 kgf.cm}] (6) Confirm that the brush surely touches the grooves of the slip ring. 3-26 BVW-55 P2...
  • Page 89 (Refer to Section 5-7.) 8. AT head position adjustment (Refer to Section 5-8.) 9. Drum phase system adjustment (Refer to Section 6-2.) 10. PB system adjustment (Refer to Section 6-2.) 11. REC system adjustment (Refer to Section 6-2.) 3-27 BVW-55 P2...

  • Page 90: Video Head Cleaner Replacement

    Tools . Torque screwdriver bit (for M1.4): J-6325-110-A . Torque screwdriver (for 3 kg): J-6325-400-A Replacement PWH1.4 x 3.5 1. VH cleaner assembly removal Remove the two screws, then remove the VH VH cleaner assembly cleaner assembly. 3-28 BVW-55 P2...
  • Page 91 Narrow Cleaning roller VH cleaner assembly 3. VH cleaner assembly installation (1) Install the VH cleaner assembly with the two PWH1.4 x 3.5 screws. [Tightening torque: 9 x 10 VH cleaner assembly {0.9 kgf.cm}] 3-29 BVW-55 P2...
  • Page 92 4. Operation check Check that the cleaning roller touches to the VH cleaner assembly drum, or releases from the drum the drum when Engaging the manual eject knob is turned clockwise and counterclockwise. Manual eject knob (push down) 3-30 BVW-55 P2...

  • Page 93: Pinch Roller Replacement

    1. Pinch arm assembly removal Manual eject knob (1) Turn the manual eject knob counterclockwise so that the notch of the pinch press cam fits with the slider of the pinch arm assembly. Pinch press cam Notch Slider 3-31 BVW-55 P2...
  • Page 94 (3) Insert a new pinch roller into the pinch shaft in the direction indicated by the figure and tighten it with one screw. [Tightening torque: 9 x 10 White {0.9 kgf.cm}] marking Pinch shaft (cleaning with dry cloth) 3-32 BVW-55 P2...
  • Page 95 5. Operation check Pinch arm lifting shafts Check that the pinch roller is engaged to the capstan shaft when the unit is in the threading end state. Adjustment after replacement 6. Tape running adjustment (Refer to Section 5-4.) 3-33 BVW-55 P2...

  • Page 96: Swing Gear Replacement

    . Cleaning cloth (15 cm x 15 cm): 3-184-527-01 . Cleaning liquid: 9-919-573-01 Removal Screw (loosen) Gear assembly 1. Timing belt removal (1) Loosen the two screws shown in the figure of the gear assembly by one half to one turn. 3-34 BVW-55 P2...
  • Page 97 (6) Pass the pulley removed in step (2) through the shaft of the gear assembly and fasten them using a new stop washer. (7) Install the gear assembly in the mechanical deck with the one percision screw. [Tightening torque: 9 x 10 {0.9 kgf.cm}] 3-35 BVW-55 P2...
  • Page 98 The tension of the timing belt is adjusted by performing steps (4) and (5). (6) Apply locking fluid to the screws after tightened in step (5). When applying, avoid the slot of the screw. Adjustment after replacement 4. Tape running adjustment (Refer to Section 5-4.) 3-36 BVW-55 P2...

  • Page 99: Tension Regulator Band Replacement

    (Refer to the maintenance manual Part 1, Section 1-7.) Tools . Torque screwdriver bit (for M2): J-6325-380-A . Torque screwdriver (for 3 kg): J-6325-400-A . Stop washer fastening tool: J-6323-530-A . Cleaning cloth (15 cm x 15 cm): 3-184-527-01 . Cleaning liquid: 9-919-573-01 3-37 BVW-55 P2...
  • Page 100 (3) Move the tension regulator band in the direction indicated by arrow A, remove the hook from the longitudinal hole of the T rail, Hook then remove the tension regulator band. Longitudinal hole Band holder 3-38 BVW-55 P2...
  • Page 101 (2) Hook the spring removed in step (1) of procedure 1 in the former position. Pin of the T drawer arm Spring Adjustment after replacement 5. Tape running adjustment (Refer to Section 5-4.) 6. REV back tension adjustment (Refer to Section 5-3-2.) 3-39 BVW-55 P2...

  • Page 102: Ctl Head Replacement

    (Refer to the maintenance manual Part 1, Section 1-6.) Tools . Torque screwdriver bit (for M1.4): J-6325-110-A . Torque screwdriver bit (for M2): J-6325-380-A . Torque screwdriver (for 3 kg): J-6325-400-A . Cleaning cloth (15 cm x 15 cm): 3-184-527-01 . Cleaning liquid: 9-919-573-01 3-40 BVW-55 P2...
  • Page 103 (Refer to step (1) of procedure 2.) Never make a mistake in the color and place of the wire to be soldered. If so, a serious trouble occurs in the compatibility of the CTL head tape. Contact surface (cleaning) PSW2 x 5 3-41 BVW-55 P2...
  • Page 104 (Refer to Section 5-4.) 6. Video tracking adjustment (Refer to Section 5-5.) 7. CTL head height adjustment (Refer to Section 5-6.) 8. CTL head position adjustment (Refer to Section 5-7.) 9. AT head position adjustment (Refer to Section 5-8.) 3-42 BVW-55 P2...

  • Page 105: Timing Belt Replacement

    . Cleaning cloth (15 cm x 15 cm): 3-184-527-01 . Cleaning liquid: 9-919-573-01 Removal 1. Timing belt removal (1) Loosen the two screws shown in the figure of Screw (loosen) Gear assembly the gear assembly by one half to one turn. 3-43 BVW-55 P2...
  • Page 106 The tension of the timing belt is adjusted by performing steps (4) and (5). (6) Apply locking fluid to the screws after tightened in step (5). When applying, avoid the slot of the screw. Adjustment after replacement 3. Tape running adjustment (Refer to Section 5-4.) 3-44 BVW-55 P2...

  • Page 107: S Main Brake Shoe Replacement

    1. S brake assembly removal (1) Remove the two screws. (2) Remove the S brake assembly while releasing Brake shoe the brake shoe from the S reel table. PSW2 x 5 S brake assembly S reel table 3-45 BVW-55 P2...
  • Page 108 (3) Pass the other end of the brake shoe through Surface of adhesive tape the hole of the brake arm. New brake shoe (4) Attach the brake shoe to the brake arm while taking care that the brake shoe is not bent. Brake shoe Press 3-46 BVW-55 P2...
  • Page 109 Press 4. Operation check Brake shoe Check that the brake shoe is released from the S reel table when the plunger of the brake solenoid Release is pushed in the energized direction. Plunger (press) S reel table 3-47 BVW-55 P2...

  • Page 110: Capstan Motor Replacement

    . Hexagon bit (Across flat has 1.5 mm): J-6326-120-A . Torque screwdriver bit (for M1.4): J-6325-110-A . Torque screwdriver bit (for M2): J-6325-380-A . Torque screwdriver (for 3 kg): J-6325-400-A . Cleaning cloth (15 cm x 15 cm): 3-184-527-01 . Cleaning liquid: 9-919-573-01 3-48 BVW-55 P2...
  • Page 111 Remove the two screws, then remove the VH VH cleaner assembly cleaner assembly. 2. Timing belt removal Screw (loosen) Gear assembly (1) Loosen the two screws shown in the figure of the gear assembly by one half to one turn. 3-49 BVW-55 P2...
  • Page 112 [Tightening torque: 20 x 10 {2.0 kgf.cm}] Be careful not to damage the capstan shaft when the new capstan motor is passed through the hole of the mechanical deck assembly. (2) Connect the harness to the board of the capstan motor. 3-50 BVW-55 P2...
  • Page 113 Reference The tension of the timing belt is adjusted by performing steps (4) and (5). (6) Apply locking fluid to the screws after tightened in step (5). When applying, avoid the slot of the screw. 3-51 BVW-55 P2...
  • Page 114 (A002 : CAPSTAN FG DUTY) 12. Video tracking check 9. CAPSTAN FRICTION adjustment (Refer to Section 5-5.) (Refer to Section 2-2-2.) (A003 : CAPSTAN FRICTION) 10. CAPSTAN FREE SPEED adjustment (Refer to Section 2-2-2.) (A004 : CAPSTAN FREE SPEED) 3-52 BVW-55 P2...

  • Page 115: S Reel Motor Replacement

    (2) Disconnect the harness from the board of the S reel motor. Be careful not to lose the harness because it is used again. Harness Positioning pin S reel motor PSW2 x 5 Positioning hole 3-53 BVW-55 P2...
  • Page 116 [Tightening torque: 20 x 10 {2.0 kgf.cm}] Adjustment after replacement 3. S REEL FG DUTY adjustment (Refer to Section 2-2-2.) (A001 : S REEL FG DUTY) 4. Tape running adjustment (Refer to Section 5-4.) 3-54 BVW-55 P2...

  • Page 117: At Head Replacement

    (Refer to the maintenance manual Part 1, Section 1-7.) Tools . Torque screwdriver bit (for M1.4): J-6325-110-A . Torque screwdriver bit (for M2): J-6325-380-A . Torque screwdriver (for 3 kg): J-6325-400-A . Cleaning cloth (15 cm x 15 cm): 3-184-527-01 . Cleaning liquid: 9-919-573-01 3-55 BVW-55 P2...
  • Page 118 (2) Pull the AU-262 board out. And then, disconnect the AT head harness from the connector (CN300) on the AU-262 board. (3) Remove the three precision screws, then remove the AT head assembly. CN300 SV-206 board CN601 3-56 BVW-55 P2...
  • Page 119 [Tightening torque: 20 x 10 White Black {2.0 kgf.cm}] White (6) Fix the harnesses onto the AT base using the White Black White new clamp (3-847-356-02). White Black AT head board Shorter harness (12P) Clamp AT head A/T base 3-57 BVW-55 P2...
  • Page 120 VH cleaner assembly [Tightening torque: 9 x 10 {0.9 kgf.cm}] (2) Confirm that the gear of the VH clearner assembly is engaged with the gear of the gear box when the manual eject knob is pushed down. 3-58 BVW-55 P2...
  • Page 121 7. Video tracking adjustment (Refer to Section 5-5.) 8. AT head height adjustment (Refer to Section 5-9.) 9. AT head position adjustment (Refer to Section 5-8.) 10. Electrical adjustment after replacing the AT head (Refer to Section 6-3.) 3-59 BVW-55 P2...

  • Page 123: Main Parts Replacement

    . Torque screwdriver bit (for M1.4): J-6325-110-A . Torque screwdriver bit (for M2): J-6325-380-A Replacement 1. VH cleaner assembly removal Remove the VH cleaner assembly. (Refer to Section 3-6.) 2. AT head assembly removal Remove the AT head assembly. (Refer to Section 3-15.) BVW-55 P2...
  • Page 124 Leave the timing belt on the mechanical Threading motor assembly deck. CN702 SV-206 board 4. Threading motor replacement Motor Motor bracket (1) Remove the two precision screws, and then remove the motor from the motor bracket. Precision P1.7 x 2.0 Loading motor pulley BVW-55 P2...
  • Page 125 Be sure to put the other end of the motor shaft on a hard table when pressing as shown Precision in the figure. P1.7 x 2.0 Loading motor pulley Loading motor pulley Motor shaft Hard table BVW-55 P2...
  • Page 126 Install the AT head assembly. (Refer to Section 3-15.) 7. VH cleaner assembly installation CN702 Install the VH cleaner assembly. (Refer to Section 3-6.) Adjustment after replacement SV-206 board 8. AT head position adjustment (Refer to Section 5-8.) BVW-55 P2...

  • Page 127: Gear In Gear Box Replacement

    . Torque screwdriver bit (for M1.4): J-6325-110-A . Grease (PG-662): 7-651-000-59 . Tweezers Replacement 1. VH cleaner assembly removal Remove the VH cleaner assembly. (Refer to Section 3-6.) 2. AT head assembly removal Remove the AT head assembly. (Refer to Section 3-15.) BVW-55 P2...
  • Page 128 ME gear and GB(2) gear assembly) in the housing are removed together. The GB(3) gear assembly is left on the mechanical deck. Bearings are provided at the tip of each gear shaft. Be careful not to lose them. GB(3) gear assembly BVW-55 P2...
  • Page 129 (3) Replace the GB(1) gear assembly with a new one. (4) Insert the GB(1) gear assembly into the gear box housing and install the GB(2) gear assembly. (Refer to (6) in step 5 above.) GB(1) gear assembly BVW-55 P2...
  • Page 130 (4) Push the gear box housing toward the mechanical deck as far as it will go. Post Be careful not to interpose the timing belt between the gear box housing and mechani- cal deck at that time. Timing belt BVW-55 P2...
  • Page 131 12. AT head assembly installation Install the AT head assembly. (Refer to Section 3-15.) 13. VH cleaner assembly installation Install the VH cleaner assembly. (Refer to Section 3-6.) Adjustment after replacement 14. AT head position adjustment (Refer to Section 5-8). BVW-55 P2...

  • Page 132: Full Erase Head Replacement

    (Refer to the maintenance manual Part 1, Section 1-6.) Tools . Torque screwdriver (3 kg.cm): J-6325-400-A . Torque screwdriver bit (for M1.4): J-6325-110-A . Torque screwdriver bit (for M2): J-6325-380-A . Cleaning cloth (15 cm x 15 cm): 3-184-527-01 . Cleaning liquid: 9-919-573-01 4-10 BVW-55 P2...
  • Page 133 Full erase head Harness (1) Unsolder the two harnesses soldered to the full erase head. (2) Remove the one screw at the back of the CTL/FE head assembly, then remove the full erase head. PS2 x 5 4-11 BVW-55 P2...
  • Page 134 Clean the CTL head, full erase head, tape cleaner and tape guide with cleaning cloth moistened with cleaning fluid. Reference hole SV-206 board After cleaning, be sure to wipe with dry cloth. Adjustment after replacement 6. Tape running adjustment (Refer to Section 5-4.) 4-12 BVW-55 P2...

  • Page 135: S Brake Solenoid Replacement

    Remove the mechanical deck. (Refer to Section 3-1-8.) 2. SV-206 board removal Remove the SV-206 board. (Refer to Section 4-18-1.) 3. Cassette compartment removal Remove the cassette compartment. (Refer to the maintenance manual Part 1, Section 1-7.) 4-13 BVW-55 P2...
  • Page 136 P2 x 2.2 Brake arm assembly 3.0 ±0.1 mm when pushing down the iron core in the direction of the arrow by a finger and tighten it with the two screws. [Tightening torque: 20 x 10 Push {2.0 kgf.cm}] 4-14 BVW-55 P2...
  • Page 137 Check after replacement 11. Tape running check (Refer to Section 5-4.) 12. Video tracking check (Refer to Section 5-5.) 13. CTL head position check (Refer to Section 5-7.) 14. AT head position check (Refer to Section 5-8.) 4-15 BVW-55 P2...

  • Page 138: S/T Slider Replacement

    1. Put the unit into the unthreading end state. 2. Turn off the power. 3. Remove the upper frame. (Refer to the maintenance manual Part 1, Section 1-6.) 4. Remove the cassette compartment. (Refer to the maintenance manual Part 1, Section 1-7.) 4-16 BVW-55 P2...
  • Page 139 Remove the screw, and then remove the full top sensor. 8. S and T catchers removal Remove the three screws respectively, and then remove the S catcher, and T catcher. Never turn or remove the screws (*) shown in the figure. 4-17 BVW-55 P2...
  • Page 140 S cam gear with the ME gear (D) reference hole (2.0 mm) on the mechanical deck. Then pass the parallel pin (d = 2.0 mm) through these holes. Fig. (A) Parallel pin (d = 1.6 mm) T cam gear 4-18 BVW-55 P2...
  • Page 141 (5) Fix the link assembly with the nine screws. Be careful not to hit the stationary head and other parts with a screwdriver during installa- tion. (6) Pull out three parallel pins passed in steps (1) to (3). Hole 4-19 BVW-55 P2...
  • Page 142 Adjustment after replacement 20. Tape running adjustment (Refer to Section 5-4.) 21. Video tracking adjustment (Refer to Section 5-5.) 22. CTL head position adjustment (Refer to Section 5-7.) 23. AT head position adjustment (Refer to Section 5-8.) 4-20 BVW-55 P2...

  • Page 143: S/T Threading Gear Replacement

    7-624-105-04 (2.3) x 1 3-559-408-11 x 4 (for S, T sliders, tension regulator band, and T Stop washer: tension arm) . The two parallel pins (d = 2.0 mm) are required as tools for gear phase adjustment. 4-21 BVW-55 P2...
  • Page 144 (Refer to Section 3-9.) 6. S tension regulator arm removal Remove the S tension regulator arm. (Refer to Section 4-10.) 7. Full top sensor removal Remove the full top sensor. (Refer to step 7 in Section 4-5.) 4-22 BVW-55 P2...
  • Page 145 S gear (S) and S threading gear assembly is easy to be out of phase. 14. Slider installation (1) Pull out the link of the threading gear assembly. (2) Install the slider using a new stop washer. 4-23 BVW-55 P2...
  • Page 146 Adjustment after replacement 24. Tape running adjustment (Refer to Section 5-4.) 25. Video tracking adjustment (Refer to Section 5-5.) 26. CTL head position adjustment (Refer to Section 5-7.) 27. AT head position adjustment (Refer to Section 5-8.) 4-24 BVW-55 P2...

  • Page 147: Reel Table Replacement

    . Reel table height adjustment tool: J-6324-150-A . Cassette reference plate: J-7032-610-B . Cleaning cloth (15 cm x 15 cm): 3-184-527-01 . Cleaning liquid: 9-919-573-01 . Torque driver (3 kg): J-6325 400 A . Bit for torque driver (M1.4): J-6325-110-A 4-25 BVW-55 P2...
  • Page 148 T reel table Polywashers may adhere to the bottom of the reel table. Return all polywashers to the reel shaft in this case. T soft brake arm Tension regulator band assembly 4-26 BVW-55 P2...
  • Page 149 The go end side of the gauge slides over the flange of the reel table. The not-go end side of the gauge blocks with the flange of the reel table. . Difference between go end side and not-go end side in dimension is 0.2 mm 4-27 BVW-55 P2...
  • Page 150 12. FWD back tension adjustment (when S reel table was replaced) (Refer to Section 5-3-1.) 13. REV back tension adjustment (when T reel table was replaced) (Refer to Section 5-3-2.) 14. Tape running adjustment (Refer to Section 5-4.) 4-28 BVW-55 P2...

  • Page 151: Tape Guide Replacement

    The replacement procedures of the following tape guides are described in this section. S2 guide T2 guide T3 guide (T drawer guide) T4 guide S3 guide T5 guide (S tension regulator guide) T6 guide (T tension regulator guide) T7 guide S4 guide 4-29 BVW-55 P2...
  • Page 152 . Cleaning cloth (15 cm x 15 cm): 3-184-527-01 . Cleaning liquid: 9-919-573-01 If the tape guide adjustment driver tip is broken, it is recommended to repair by using the following spare bit. . Spare bit (0.89 mm): J-6322-420-3 4-30 BVW-55 P2...
  • Page 153 (3) Turn the driver knob counterclockwise, then remove the upper flange from the tape guide shaft. (4) Pull out the guide roller from the shaft. The lower flange and compression spring can be removed. 4-31 BVW-55 P2...
  • Page 154 (5) Turn the upper flange clockwise, and thread it to the guide shaft. Black marking Guide roller Guide shaft Apply a locking compound. Be careful not to smear the side of frange and guide roller by the locking compound. 4-32 BVW-55 P2...
  • Page 155 1/10 of the tape width. . T7 guide Tape should run without contacting the upper and lower flanges. Even if the tape runs without contacting this tape guide roller, it is acceptable. 4-33 BVW-55 P2...

  • Page 156: Pinch Press Cam Replacement

    . Cleaning liquid: 9-919-573-01 . Grease (PG-662): 7-651-000-59 . Tweezers Replacement 1. Pinch arm assembly removal Remove the pinch arm assembly. (Refer to Section 3-7.) 2. VH cleaner assembly removal Remove the VH cleaner assembly. (Refer to Section 3-6.) 4-34 BVW-55 P2...
  • Page 157 (d = 1.6 mm) satisfied, lift the pinch press cam slightly up Hole on mechanical and shift the engagement of each tooth. deck (4) Pull out the parallel pin (d = 1.6 mm). 1.6 mm dia. hole 4-35 BVW-55 P2...
  • Page 158 (2) Check that the pinch arm is smoothly moved upward and put into the unthreading end state when the manual eject knob is turned coun- terclockwise. 4-36 BVW-55 P2...

  • Page 159: S Tension Regulator Arm Assembly Replacement

    4. Remove the cassette compartment. (Refer to the maintenance manual Part 1, Section1-7.) Tools . Torque screwdriver (3 kg.cm): J-6325-400-A . Torque screwdriver bit (for M1.4): J-6325-110-A . Cleaning cloth (15 cm x 15 cm): 3-184-527-01 . Cleaning liquid: 9-919-573-01 4-37 BVW-55 P2...
  • Page 160 (2) After cleaning, wipe with dry cloth. Adjustment after replacement 4. S tension regulator offset/gain adjustment (Refer to Section 5-2.) 5. Tape running adjustment (Refer to Section 5-4.) 4-38 BVW-55 P2...

  • Page 161: T Tension Regulator Arm Assembly Replacement

    (Refer to the maintenance manual Part 1, Section 1-7.) Tools . Stop washer fastening tool: J-6323-530-A . Torque screwdriver (3 kg.cm): J-6325-400-A . Torque screwdriver bit (for M1.4): J-6325-110-A . Cleaning cloth (15 cm x 15 cm): 3-184-527-01 . Cleaning liquid: 9-919-573-01 . Tweezers 4-39 BVW-55 P2...
  • Page 162 (1) Clean the guide roller of the tension regulator arm assembly with cleaning cloth moistened with cleaning fluid. (2) After cleaning, wipe with dry cloth. Adjustment after replacement 4. REV back tension adjustment (Refer to Section 5-3-2.) 5. Tape running adjustment (Refer to Section 5-4.) 4-40 BVW-55 P2...

  • Page 163: T Idler Assembly Replacement

    . Stop washer fastening tool: J-6323-530-A . Torque screwdriver (3 kg.cm): J-6325-400-A . Torque screwdriver bit (for M1.4): J-6325-110-A . Oil: 7-661-018-18 . Cleaning cloth (15 cm x 15 cm): 3-184-527-01 . Cleaning liquid: 9-919-573-01 . Tweezers 4-41 BVW-55 P2...
  • Page 164 6. Spring installation Hook the two springs removed in step 1 to the gear connecting arm assembly. Check after replacement 7. Operation check Insert the cassette tape and check that the PLAY, F-FWD, and REW operations are normal. 4-42 BVW-55 P2...

  • Page 165: Cam Gear Assembly Replacement

    . Torque screw driver bit (for M2): J-6325-380-A . Torque screwdriver (for 3 kg): J-6325-400-A . Stop washer fastening tool: J-6323-530-A . Cleaning cloth (15 cm x 15 cm): 3-184-527-01 . Cleaning fluid: 9-919-573-01 . Oil: 7-661-018-18 . Grease (RG-662): 7-651-000-59 . Tweezers 4-43 BVW-55 P2...
  • Page 166 Remove the tension regulator band. (Refer to Section 3-9.) 4. Release arm assembly removal Remove the stop washer, and then remove the Stop washer release arm assembly. Release arm assembly T tension drawer arm assembly Cam gear assembly 4-44 BVW-55 P2...
  • Page 167 (1) Mark either of the tooth of the cam gear assembly and the tooth of the midway gear Marking which are meshed each other, using a twee- zers. (2) Lift the cam gear assembly out. Intermittent gear Cam gear assembly Midway gear 4-45 BVW-55 P2...
  • Page 168 Positioning pin stop washer as shown in the Fig-1. (2) Attach the band aligning plate using a new T tension drawer arm assembly Cam slot stop washer. Cam gear installation shaft Positioning pin Shaft 4-46 BVW-55 P2...
  • Page 169 (Refer to Section 3-9-4.) 12. Parallel pin removal Pull the parallel pin out from the S cam gear. Adjustment after replacement 13. Tape running check (Refer to Section 5-4.) 14. REV back tension check (Refer to Section 5-3-2.) 4-47 BVW-55 P2...

  • Page 170: Intermittent Gear Replacement

    J-6325-400-A . Stop washer fastening tool: J-6323-530-A . Parallel pin (d = 2.0 mm): 3-703-358-04 . Cleaning cloth (15 cm x 15 cm): 3-184-527-01 . Cleaning fluid: 9-919-573-01 . Oil: 7-661-018-18 . Grease (RG-662): 7-651-000-59 . Tweezers 4-48 BVW-55 P2...
  • Page 171 5. Threading link assembly installation Reattach the cam gear assembly. (Refer to Section 4-5-11.) Cam gear assembly Adjustment after replacement 6. Tape running check (Refer to Section 5-4.) 7. REV back tension check (Refer to Section 5-3-2.) 4-49 BVW-55 P2...

  • Page 172: Fan Motor Replacement

    Connector panel installation Operation check Preparations 1. Turn off the power. 2. Open the connector panel. (Refer to the maintenance manual Part 1, Section 1-6.) Tools . Torque screwdriver (3 kg.cm): J-6325-400-A . Torque screwdriver bit (for M2): J-6325-380-A 4-50 BVW-55 P2...
  • Page 173 (Refer to the maintenance manual Part 1, Section 1-6.) Boss Boss 4. Operation check Attach a motor in this place. (1) Turn on the power. (2) Check that the fan motor rotates, and blows off the air from the ventilation hole of the unit. 4-51 BVW-55 P2...

  • Page 174: Jog/Shuttle Dial Replacement

    JOG/SHUTTLE dial installation Preparations 1. Turn off the power. 2. Remove the control panel. (Refer to Section 3-1-7.) Tools . Torque screwdriver (3 kg.cm): J-6325-400-A . Torque screwdriver bit (for M1.4): J-6325-110-A . Torque screwdriver bit (for M2): J-6325-380-A 4-52 BVW-55 P2...
  • Page 175 (2) Fit the three bosses of the JOG/SHUTTLE dial to the three positioning notches on the back side of the control panel, then tighten it with three screws. (Tightening torque: 20 x 10 {2.0 kgf.cm}) JOG/SHUTTLE dial Connector Harness Positioning notches 4-53 BVW-55 P2...

  • Page 176: Lcd Monitor And Backlight Replacement

    CN6 on the DP-300 board. (2) Remove the four screws shown in the figure. (3) Disconnect the connector CN7 connected to B2 x 4 the CN-1541 board below the DP-300 board to lift the DP-300 board out. CN-1541 board 4-54 BVW-55 P2...
  • Page 177 (3) Remove the four screws to remove the LCD monitor. BVTT2 x 5 Backlight (4) Remove the four screws, then remove the B2 x 4 backlights by moving it in the arrow direc- BVTT2 x 5 tion. B2 x 4 Backlight LCD monitor 4-55 BVW-55 P2...
  • Page 178 CN-1541 board. B2 x 4 (2) Reinstall the DP-300 board with the four screws. (3) Reconnect the harness connector disconnect- ed in (1) of step 1 to CN6 on the DP-300 board. B2 x 4 Inverter board 4-56 BVW-55 P2...

  • Page 179: Lcd Monitor Replacement

    CN6 on the DP-300 board. (2) Remove the four screws shown in the figure. (3) Disconnect the connector CN7 connected to the CN-1541 board below the DP-300 board B2 x 4 to lift the DP-300 board out. CN-1541 board 4-57 BVW-55 P2...
  • Page 180 (2) Remove the four screws to remove the LCD B2 x 4 monitor. 4. LCD monitor installation (1) Install a new LCD monitor with the four screws. (2) Connect the connector CN1 (A side) of the CN-1541 board to the LCD monitor. 4-58 BVW-55 P2...
  • Page 181 CN-1541 board. (2) Reinstall the DP-300 board with the four B2 x 4 screws. (3) Reconnect the harness connector disconnect- ed in (1) of step 1 to CN6 on the DP-300 board. Inverter board 4-59 BVW-55 P2...

  • Page 182: Board Replacement

    4. Remove the bottom plate. (Refer to the maintenance manual Part 1, Section 1-6.) Tools . Torque screwdriver (3 kg.cm): J-6325-400-A . Torque screwdriver bit (for M1.4): J-6325-110-A . Torque screwdriver bit (for M2): J-6325-380-A . Hexagonal bit: J-6326-120-A 4-60 BVW-55 P2...
  • Page 183 (Refer to Section 5-4.) Cam gear shaft S tension regulator shaft 8. Video tracking adjustment (Refer to Section 5-5.) 9. CTL head position adjustment (Refer to Section 5-7.) 10. AT head position adjustment (Refer to Section 5-8.) 4-61 BVW-55 P2...

  • Page 184: Board Replacement

    (2) Push the RE-174 board downward and connect it firmly to the connector (CN900) on the MB-838 board. (3) Fix the RE-174 board to the chassis with the two screws. Connector (MB-838 board) (4) Connect the harness connector to connector CN1 and CN5. 4-62 BVW-55 P2...
  • Page 185 3. S tension regulator arm assembly installation Install the S tension regulator arm assembly. (Refer to Section 4-10.) 4. Tension regulator guide cleaning (1) Clean the guide roller with cleaning cloth moistened with cleaning fluid. (2) After cleaning, wipe with dry cloth. 4-63 BVW-55 P2...
  • Page 186 4-18-3. SR-65 Board Replacement Adjustment after replacement 5. S tension regulator offset/gain adjustment (Refer to Section 5-2.) 6. Tape running adjustment (Refer to Section 5-4.) 4-64 BVW-55 P2...

  • Page 187: Board (Dc In Connector) Replacement

    (2). 3. RE-174 board installation Reinstall all the boards in the reverse order of steps 1 to 2. PWH2.6 x 4 DC IN connector B2.6 x 5 (DC-97 board) 4-65 BVW-55 P2...

  • Page 188: Board Replacement

    (5) Attach the HP-88 board to the bracket with the screw. (6) Connect the harness connectors to connectors CN1 and CN8. HP-88 board Knob 3. Shield sheet installation Place the shield sheet onto the chassis. Bracket P2 x 2.5 < Chassis back > 4-66 BVW-55 P2...
  • Page 189 (1) Connect the harness connector to connector CN1 on the PSW-63 board. (2) Install the power switch block in the unit using a hexagon nut so that the connector CN1 on the PSW-63 board faced to the mechanical deck. 4-67 BVW-55 P2...
  • Page 190 CN-1541 board below the DP-300 board while lifting the DP-300 board up. CN-1541 board (4) Install a new DP-300 board in the reverse order of steps. 3. Display panel cover installation Install the display panel cover. (Refer to Section 3-1-6.) 4-68 BVW-55 P2...
  • Page 191 2. Inverter board removal B2 x 4 (1) Disconnect the harness connectors from the connectors CN1, CN2 and CN3 on the inverter board. Inverter board (2) Remove the two screws, then remove the B2 x 4 inverter board. 4-69 BVW-55 P2...
  • Page 192 (1) to (4). 4. Inverter board installation Install the inverter board in the reverse order of steps (1) to (2) in step 2. 5. Display panel cover installation Install the display panel cover. (Refer to Section 3-1-6.) 4-70 BVW-55 P2...

  • Page 193: Tape Path Alignment

    When adjusting the CTL head position CTL head position check and adjustment AT head position check and adjustment When adjusting the AT head height AT head height check and adjustment AT head azimuth check and adjustment AT head head-to-tape contact check BVW-55 P2...
  • Page 194 Drum assembly Lead Drum exit side (threading end mode) AT head T3 guide T4 guide Impedance roller Capstan (IR-4) T2 guide Pinch roller T1 guide T5 guide T6 (tension regulator) guide T7 guide Tape top sensor Drum assembly Lead BVW-55 P2...
  • Page 195 . Oscilloscope (Tektronix 2465B or equivalent) . DC power supply (AC-550/550CE or equivalent) (The AC adaptors AC-500 and AC-DN1 cannot be used to derive power.) . Weight about 1000 g (It is smaller than S type cassette tape in size.) . Bamboo stick BVW-55 P2...
  • Page 196 . Tape running surface of the upper drum and video heads . Tape running surfaces of the lower drum and lead . Stationary heads and tape cleaner . Tape guides How to clean these portions, refer to the maintenance manual Part 1, Section 4-2. BVW-55 P2...
  • Page 197 Set the switch S100-1 on the SV-206 board to ON so that the unit put into the cassette compartment locked state electrically. After adjustment is completed, be sure to set this switch back to the former position (OFF). BVW-55 P2...
  • Page 198 When loosening or tightening the following screws, apply locking compound to the screws after adjust- ment is completed. The locking compound that applied to other surrounding parts must be wiped off with gauze or soft cloth. . Locking compound : 7-432-114-11 BVW-55 P2...

  • Page 199: S Tension Regulator Offset/Gain Adjustment

    Part 1, Section 1-7.) 4. Connect the oscilloscope as follows; CH-1: TP700/SV-206 CH-2: E700/SV-206 CH-1: DC mode, 0.2 V/DIV 5. Set the switches S100-1 and S100-2 on the SV-206 board to ON. 6. Turn on the power. E700 TP700 BVW-55 P2...
  • Page 200 (3) Tighten the two screws loosened in step (1). Tightening torque: SR-65 board Notch Specified sensor 20 x 10 N.m {2.0 kgf.cm} Spec. 1 : 0.00 ±0.02 V (4) Recheck the output level at TP700 to meet the specification referring to step 1. BVW-55 P2...
  • Page 201 3. If Spec. 2 : _1.00 ±0.04 V not to meet the specification, perform adjustment again. After checks and adjustments are completed, be sure to set switches S100-1 and S100-2 on the SV-206 board to OFF. BVW-55 P2...

  • Page 202: Back Tension Check And Adjustment

    (Refer to Section 1-1.) 5. Set the switch S100-1 on the SV-206 to ON. 6. Turn on the power. 7. Place the torque cassette to the unit, and put the weight (about 1000 g) on the torque cassette. 5-10 BVW-55 P2...
  • Page 203 (extend) or bend (shorten) the hook of the spring. (4) Recheck the FWD back tension meets the specification according to step 1. S tension regulator arm After check and adjustment are completed, be sure to set switch S100-1 on the SV-206 board to OFF. 5-11 BVW-55 P2...

  • Page 204: Rev Back Tension Check And Adjustment

    T7 guide, and the side edge of the mechanical deck is parallel. (3) If not, adjust the eccentric pin (white) on the tension regulator band using a flatbladed screwdriver so that the positional relationship meets. Tension regulator band Eccentric pin (white) 5-12 BVW-55 P2...
  • Page 205 Hook the spring on _ side concave. (4) Recheck the REV back tension meets the specification according to step 2. After check and adjustment are completed, be sure to set the switch S100-1 on the SV-206 board to OFF. 5-13 BVW-55 P2...

  • Page 206: Tape Running Check And Adjustment

    Check procedure 1. Set S cassette tape Set the beginning portion of the S cassette tape without lid to the unit, and put the weight (about 1000 g) on the cassette tape. 2. Turn on the power 5-14 BVW-55 P2...
  • Page 207 1/10 of the tape width. . T7 guide Tape should run without contacting the upper and lower flanges. Even if the tape runs without contacting this tape guide roller, it is acceptable. 5-15 BVW-55 P2...
  • Page 208 1/10 of the tape width. . T7 guide Tape runs without contacting the upper and lower flanges. Even if the tape runs in contact with the upper or lower flange, tape curl could not be acceptable. 5-16 BVW-55 P2...
  • Page 209 Tape runs without contacting the upper and lower flanges. Even if the tape runs in contact with the upper or lower flange, tape curl could not be acceptable. Tape should run in contact with the guide roller. 5-17 BVW-55 P2...
  • Page 210 T5 guide meet the specification 4. (4) Repeat the step (3) three times, and check the tape running conditions meet the specifica- tion 4. If not, perform step 7 and later. 5-18 BVW-55 P2...
  • Page 211 11. AT head height check and adjustment (Refer to Section 5-9.) After check and adjustment are completed, be 12. AT head azimuth check and sure to set the switch S100-1 on the SV-206 adjustment board to OFF. (Refer to Section 5-10.) 5-19 BVW-55 P2...

  • Page 212: Video Tracking Check And Adjustment

    Oscilloscope setting: CH-1 : 50 mV/DIV E501 TIME : 2 ms/DIV TP807 TP806 TP804 5. Switch setting TP805 Set the switch S100-1 (cassette compartment TP803 TP802 lock) on the SV-206 board to ON. TP801 MD-122 BOARD, B Side 5-20 BVW-55 P2...
  • Page 213 (refer to Section 5-4) and S tension regulator video tracking adjustment (refer to steps 19 and later) to meet both specifications. (4) Turn the upper flange of S2 guide clockwise so that the RF signal waveform is almost flat. 5-21 BVW-55 P2...
  • Page 214 TP807 (2) Play back the CR2-1B. TP806 TP804 (3) Press S101 switch on the SV-206 board more TP805 than 3 seconds so that the tracking VR TP803 becomes to be effective. TP802 TP801 MD-122 BOARD, B Side 5-22 BVW-55 P2...
  • Page 215 [Drum entrace side] [Drum exit side] (3) Repeat changing the mode REVx10 to PLAY three times, check that the waveform satisfies the specification 4 on every time. (NG) (NG) 14. Adjust the drum PG phase (Refer to Section 6-2-1.) 5-23 BVW-55 P2...
  • Page 216 (Refer to Section 5-8.) 17. Check the AT head height (Refer to Section 5-9.) Be sure to check the AT head position when the AT head height is adjusted. 18. Check the AT head azimuth (Refer to Section 5-10.) 5-24 BVW-55 P2...
  • Page 217 If it is not satisfied, perform the tape running adjustment (refer to Section 5-4) and this procedure to meet both specifications. Spec. 7: The fluctuation value in each portion of a waveform should be less than 10 %. > 0.9 > 0.9 > 0.9 5-25 BVW-55 P2...
  • Page 218 > 0.80 After adjustment are completed, be sure to set S100-1 switch to OFF position. Spec. 9: The fluctuation value in each portion of a waveform should be less than 10 %. > 0.9 > 0.9 > 0.9 5-26 BVW-55 P2...

  • Page 219: Ctl Head Height Check And Adjustment

    SV-206 board to ON. 4. Set the alignment tape Set the CR8-1A and put a weight on the cassette so that it does not rise up. Weight about 1000 g is suitable. MD-122 BOARD, B Side 5-27 BVW-55 P2...
  • Page 220 Adjustment nut Tape cleaner Full-erase head And at that time, check the output level is 5 Vp-p or more. After adjustment are completed, be sure to set S100-1 switch to OFF position. 5-28 BVW-55 P2...

  • Page 221: Ctl Head Position Check And Adjustment

    SV-206 board to ON. 4. Set the alignment tape Set the CR2-1B and put a weight on the cassette so that it does not rise up. MD-122 BOARD, B Side Weight about 1000 g is suitable. 5-29 BVW-55 P2...
  • Page 222 RF envelope waveform as L (5) Check that the levels Lv (readout by step (2)) and L (readoout step (4)) satisfy the specifi- cation 1. If the specification is not satisfied, perform steps 9 and later. 5-30 BVW-55 P2...
  • Page 223 In Case the Adjustment is Performed . Alignment tape : CR2-1B 12. Adjust the AT head position (D109 Lit) (Refer to Section 5-8.) Y RF After adjustment are completed, be sure to set S100-1 switch on the SV-206 board to OFF position. 5-31 BVW-55 P2...

  • Page 224: At Head Position Check And Adjustment

    Set the CR2-1B and put a weight on the cassette MD-122 BOARD, B Side so that it does not rise up. Weight about 1000 g is suitable. Check procedure 5. Turn the power on 6. Play back the alignment tape Play back the CR2-1B. 5-32 BVW-55 P2...
  • Page 225 (Refer to Section 5-11.) 15. Check the AT head position Refer to steps 6 and 7 in this section. After adjustment are completed, be sure to set S100-1 switch on the SV-206 board to OFF position. 5-33 BVW-55 P2...

  • Page 226: At Head Height Check And Adjustment

    Set the CR8-1A and put a weight on the cassette so that it does not rise up. AU-262 BOARD, A Side Weight about 1000 g is suitable. E501 TP807 TP806 TP804 TP805 TP803 TP802 TP801 MD-122 BOARD, B Side 5-34 BVW-55 P2...
  • Page 227 (2) Check that both levels in CH-1 and CH-2 decrease when portion B of the tape is pushed CH-1 If both levels increase, perform step 9. CH-2 Spec. : The portion C widens when pressing down and pushing up the alignment tape. 5-35 BVW-55 P2...
  • Page 228 14. Re-check the AT head Perform the steps 10 and 12 again. 15. Locking compound applying (Refer to Section 5-1.) After adjustment are completed, be sure to set S100-1 switch on the SV-206 board to OFF position. Tape CH-1 Minimize CH-2 5-36 BVW-55 P2...

  • Page 229: At Head Azimuth Check And Adjustment

    SV-206 board to ON. TP402 4. Set the alignment tape Set the CR8-1A and put a weight on the cassette AU-262 BOARD, A Side so that it does not rise up. Weight about 1000 g is suitable. 5-37 BVW-55 P2...
  • Page 230 Spec. : A < 0.52 cm the specification on every PLAY mode. If the specification is not satisfied in any steps (3), (4), (5) or (6), perform steps 8 and later. 5-38 BVW-55 P2...
  • Page 231 13. Re-check the AT head (Rerform the steps 9 and 10 again.) 14. Locking compound applying (Refer to Section 5-1.) Spec. A 0.52 cm After adjustment are completed, be sure to set S100-1 switch on the SV-206 board to OFF position. 5-39 BVW-55 P2...

  • Page 232: At Head Head-To-Tape Contact Check

    Set the CR8-1A and put a weight on the cassette AU-262 BOARD, A Side so that it does not rise up. Weight about 1000 g is suitable. E501 TP807 TP806 TP804 TP805 TP803 TP802 TP801 MD-122 BOARD, B Side 5-40 BVW-55 P2...
  • Page 233 <AUDIO output waveform> After adjustment are completed, be sure to set S100-1 switch on the SV-206 board to OFF position. CH-1 CH-2 Spec. : Both increasing values of the output levels in CH-1 and CH-2 are within 5%. 5-41 BVW-55 P2...
  • Page 235 The material contained in this manual consists of information that is the property of Sony Corporation. Sony Corporation expressly prohibits the duplication of any portion of this manual or the use thereof for any purpose other than the operation or maintenance of the equipment described in this manual without the express written permission of Sony Corporation.
  • Page 236 Printed in Japan Sony Corporation BVW-55 (UC) E 1999. 7 08 Broadcasting & Professional Systems Company ©1999 9-967-828-01...

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