Sony DNW-A75 BETACAM SX User manual

DIGITAL VIDEOCASSETTE RECORDER
DNW-A75/A75P
MAINTENANCE MANUAL Part 1
1st Edition (Revised 8)
Serial No. 10001 and Higher: DNW-A75
Serial No. 40001 and Higher: DNW-A75P

DNW-A75/A75P
!WARNING
This manual is intended for qualified service personnel only.
To reduce the risk of electric shock, fire or injury, do not perform any servicing other than that
contained in the operating instructions unless you are qualified to do so. Refer all servicing to
qualified service personnel.
!WARNUNG
Die Anleitung ist nur für qualifiziertes Fachpersonal bestimmt.
Alle Wartungsarbeiten dürfen nur von qualifiziertem Fachpersonal ausgeführt werden. Um die
Gefahr eines elektrischen Schlages, Feuergefahr und Verletzungen zu vermeiden, sind bei
Wartungsarbeiten strikt die Angaben in der Anleitung zu befolgen.Andere als die angegeben
Wartungsarbeiten dürfen nur von Personen ausgeführt werden, die eine spezielle Befähigung
dazu besitzen.
!AVERTISSEMENT
Ce manual est destiné uniquement aux personnes compétentes en charge de l’entretien. Afin
de réduire les risques de décharge 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.
Attention-when the product is installed in Rack:
1. Prevention against overloading of branch circuit
When this product is installed in a rack and is
supplied power from an outlet on the rack, please
make sure that the rack does not overload the supply
circuit.
2. Providing protective earth
When this product is installed in a rack and is
supplied power from an outlet on the rack, please
confirm that the outlet is provided with a suitable
protective earth connection.
3. Internal air ambient temperature of the rack
When this product is installed in a rack, please make
sure that the internal air ambient temperature of the
rack is within the specified limit of this product.
4. Prevention against achieving hazardous
condition due to uneven mechanical loading
When this product is installed in a rack, please make
sure that the rack does not achieve hazardous
condition due to uneven mechanical loading.

DNW-A75/A75P
CAUTION
Danger of explosion if battery is incorrectly
replaced.
Replace only with the same or equivalent type
recommended by the manufacturer.
Dispose of used batteries according to the
manufacturer’s instructions.
Vorsicht!
Explosionsgefahr bei unsachgemäßem
Austausch der Batterie.
Ersatz nur durch denselben oder einen vom
Hersteller empfohlenen ähnlichen Typ.
Entsorgung gebrauchter Batterien nach Angaben
des Herstellers.
ATTENTION
Il y a danger d’explosion s’il y a remplacement
incorrect de la batterie.
Remplacer uniquement avec une batterie du
même type ou d’un type équivalent recommandé
par le constructeur.
Mettre au rebut les batteries usagées
conformément aux instructions du fabricant.
ADVARSEL!
Lithiumbatteri-Eksplosionsfare ved fejlagtig
håndtering.
Udskiftning måkun ske med batteri
af samme fabrikat og type.
Levér det brugte batteri tilbage til leverandøren.
Voor de klanten in Nederland
Dit apparaat bevat een (CF)n-Li batterij voor memory
back-up.
Raadpleeg uw leverancier over de verwijdering van de
batterij op het moment dat u het apparaat bij einde
levensduur afdankt.
Gooi de batterij niet weg. maar lever hem in als KCA.
Bij dit produkt zijn batterijen geleverd.
Wanneer deze leeg zijn, moet u ze niet
weggooien maar inleveren als KCA.
1 (P)

1
DNW-A75/A75P
Table of Contents
Manual Structure
Purpose of this manual .............................................................................................. 5
Contents ..................................................................................................................... 5
Related manuals......................................................................................................... 6
Trademarks ................................................................................................................ 6
1. Installation
1-1. Installation Procedure..................................................................................1-1
1-2. Supplied Accessories ..................................................................................1-1
1-3. Operating Conditions ..................................................................................1-2
1-4. Power Supply ..............................................................................................1-2
1-4-1. Voltage and Power Requirements ..............................................1-2
1-4-2. Power Cord.................................................................................1-2
1-5. Installation Space ........................................................................................1-3
1-6. Rack Mounting............................................................................................1-4
1-7. Matching Connectors and Cables................................................................1-9
1-8. Signal Inputs and Outputs .........................................................................1-10
1-9. Switch Settings on Connector Panel .........................................................1-14
1-10. Switch and Shorting Plug Settings on PC Boards.....................................1-15
1-10-1. APR-40 Board ..........................................................................1-15
1-10-2. AU-260 Board ..........................................................................1-19
1-10-3. DM-89 Board ...........................................................................1-20
1-10-4. TBC-23A Board .......................................................................1-21
1-10-5. SS-83 Board .............................................................................1-22
1-11. Switching Search Dial Mode ....................................................................1-24
1-12. Reference System......................................................................................1-25
1-13. Settings and Adjustment when External Equipment is Connected...........1-26
1-13-1. Settings for Time Code ............................................................1-26
1-13-2. VTR Constant Values Settings of Editor .................................1-26
1-13-3. System Phase Alignment..........................................................1-27
1-13-4. Setup Menu Settings ................................................................1-27

2DNW-A75/A75P
2. Service Overview
2-1. Notes on Power Supply Block ....................................................................2-1
2-1-1. Warning on Primary Circuit Block and Electric Shock .............2-1
2-1-2. Note on Resetting the Circuit Breaker .......................................2-1
2-2. Cleaning when the Heads are Clogged .......................................................2-1
2-3. Removing/Reattaching Cabinet ..................................................................2-2
2-3-1. Upper Lid, Side Panels, and Bottom Plate .................................2-2
2-3-2. Control Panels ............................................................................2-3
2-3-3. Connector Panel Assembly ........................................................2-4
2-3-4. Power Supply Panel Assembly ..................................................2-5
2-4. Removing/Reattaching Plate MD Assembly ..............................................2-5
2-5. Removing/Reattaching Cassette Compartment...........................................2-6
2-6. Removing/Reattaching Lower Control Panel Assembly ............................2-7
2-7. Circuit Function ..........................................................................................2-8
2-8. Location of Main Parts ..............................................................................2-10
2-8-1. Printed Circuit Boards and Power Supply Unit Locations.......2-10
2-8-2. Main Mechanical Part Locations .............................................2-13
2-9. Function and Location of Sensors .............................................................2-14
2-10. System of Cassettes ...................................................................................2-16
2-11. Function of LEDs on Circuit Boards ........................................................2-18
2-12. Taking Out the Cassette in Tape Slacking ................................................2-22
2-13. Removing/Reattaching Plug-in Boards .....................................................2-23
2-14. Fixtures and Adjustment Equipment List .................................................2-24
2-14-1. Fixtures.....................................................................................2-24
2-14-2. Equipment for Adjustment .......................................................2-26
2-15. ISR.............................................................................................................2-27
2-16. Battery for Memory Backup .....................................................................2-28
2-17. Setup Menu (F-Series) ..............................................................................2-29
2-17-1. Menu Operation .......................................................................2-29
2-17-2. F-Series Items...........................................................................2-30
3. Error Message
3-1. Overview of Error Message ........................................................................3-1
3-2. Details of Error Messages ...........................................................................3-3

3
DNW-A75/A75P
4. Maintenance Mode
4-1. Overview of Maintenance Mode.................................................................4-1
4-2. TAPE Maintenance Mode (M0)..................................................................4-6
4-2-1. Overviews ..................................................................................4-6
4-2-2. SERVO CHECK Mode (C00-03) ............................................4-14
4-2-3. ANALOG DT CHECK Mode (C04) .......................................4-29
4-2-4. RF CHECK Mode (C1)............................................................4-30
4-2-5. AUDIO/VIDEO CHECK Mode (C2) ......................................4-37
4-2-6. BETACAM PB CHECK Mode (C3) .......................................4-44
4-2-7. SERVO ADJUST Mode (A00-01)...........................................4-46
4-2-8. ANALOG DT ADJUST Mode (A02)......................................4-53
4-2-9. RF ADJUST Mode (A1) ..........................................................4-58
4-2-10. AUDIO/VIDEO ADJUST Mode (A2).....................................4-66
4-2-11. BETACAM PB ADJUST Mode (A3)......................................4-75
4-2-12. MECHANISM ADJUST Mode (A4).......................................4-78
4-3. Error Logger Display Mode (M2).............................................................4-79
4-3-1. Outline......................................................................................4-79
4-3-2. Display Mode ...........................................................................4-80
4-3-3. Setting Mode ............................................................................4-82
4-4. OTHERS CHECK Mode (M3) .................................................................4-84
4-4-1. Outline......................................................................................4-84
4-4-2. ROM VERSION Display Menu (M30) ...................................4-85
4-4-3. SERIAL NUMBER Display Menu (M31)...............................4-85
4-4-4. RS-232C STATUS Display Menu (M32)................................4-86
4-4-5. MEMORY CHECK Display Menu (M35) ..............................4-87
4-4-6. HOUR METER RESET Menu (M36) .....................................4-87
4-4-7. METER HEAD ROOM Setup Menu (M37) ...........................4-88
4-4-8. 50PIN DATA ASSIGN Mode (M39) ......................................4-88
4-5. Setup Maintenance Mode (M4) ................................................................4-92
4-5-1. Outline......................................................................................4-92
4-5-2. EXTENDED MENU Display Selection Menu (M40).............4-92
4-5-3. RESET ALL SETUP Executing Menu (M49).........................4-93

4DNW-A75/A75P
5. Periodic Maintenance and Inspection
5-1. Periodic Maintenance ..................................................................................5-1
5-1-1. Index...........................................................................................5-1
5-1-2. Periodic Replacement and Check Item Table ............................5-2
5-1-3. Hours Meter ...............................................................................5-4
5-2. Cleaning ......................................................................................................5-5
5-2-1. Cleaning using Cleaning Tape ...................................................5-5
5-2-2. General Information for Cleaning using Cleaning Cloth ...........5-5
5-2-3. Tape Running Surface of Upper Drum and
Video Heads Cleaning................................................................5-7
5-2-4. Tape Running Surface of Lower Drum and
Lead Surface Cleaning ...............................................................5-8
5-2-5. Stationary Heads Cleaning .........................................................5-9
5-2-6. Tape Running System and Tape Cleaner Cleaning..................5-10
5-2-7. Fan Motors Cleaning ................................................................5-11
5-2-8. Cassette Compartment and Cassette Supports Cleaning ..........5-12
5-3. Video Head Tip Protrusion Check ............................................................5-13
5-3-1. Head Tip Protrusion Measurement ..........................................5-13
5-3-2. Brush Slip Ring Assembly Removal/Reinstallation ................5-16
6. Spare Parts
6-1. Notes on Repair Parts ..................................................................................6-1
6-2. Exploded Views ..........................................................................................6-2
6-3. Plug-in Boards.............................................................................................6-4
6-4. Packing Materials and Supplied Accessories List ......................................6-5
6-5. Power Cords List .........................................................................................6-5
6-6. Fixtures List ................................................................................................6-6
Appendix A Outline of Format
A-1. Outline ........................................................................................................A-1
A-2. Recording Format.......................................................................................A-1
A-3. Head Configuration ....................................................................................A-5
A-4. Signal Processing .......................................................................................A-6
A-4-1. Compression System of Video Signal.......................................A-6
A-4-2. Outline of Signal Processing .....................................................A-6
Appendix B Setting Check Sheet
Appendix C Circuit Description and Overall Block Diagram

5
DNW-A75/A75P
Purpose of this manual This manual is the maintenance manual part 1 of digital videocassette recorder
DNW-A75/A75P.
This manual is intended for use by trained system and service engineers, and
provides the information that is required to install and maintenance information.
Contents This manual is organized by following sections.
Section 1 Installation
Explains the information that is required to install (environment, connection infor-
mation, initial setting, etc.).
Section 2 Service Overview
Explains fundamental area of the information that is required to service, (removal of
cabinet and cassette compartment, the functions of printed circuit board, the loca-
tions of main part, fixture and measuring equipment information, notes, etc.), the
measures against trouble and ISR (Interactive Status Reporting).
Section 3 Error Message
Explains the error messages.
Section 4 Maintenance Mode
Explains each menu of the maintenance mode.
Section 5 Periodic Maintenance and Inspection
Explains the recommended periodic maintenance, the cleaning procedure and the
video head tip protrusion check procedure.
Section 6 Spare Parts
Describes the spare parts list and the exploded view for the service parts of this unit,
and the packing materials and supplied accessories list.
Appendix A Outline of Format
Explains the Betacam SX format and the head configuration.
Appendix B Setting Check Sheet
The sheet is used for checking the setup conditions such as switch, setup menu under
the application.
Appendix C Circuit Description and Block Diagram
Describes the circuit description and overall block diagram.
Manual Structure

6DNW-A75/A75P
Related manuals Besides this “maintenance manual part 1”, the following manuals are available for
digital videocassette recorder DNW-A75/A75P.
If these manuals are required, please contact your local Sony Sales Office/Service
Center.
..
..
.Operation Manual (Supplied with the DNW-A75/A75P.)
This manual is necessary for application and operation (and installation) of the DNW.
..
..
.Maintenance Manual Part 2 (Available on request)
Volume-1 : Service Instruction (Part number: 9-967-795-XX)
Volume-2 : Parts List (Part number: 9-967-796-XX)
Volume-3 : Diagrams (Part number: 9-967-797-XX)
These manuals describe the information that premises the parts level service
(adjustments, board layouts, schematic diagrams, detailed parts list, etc.) for this
unit.
..
..
.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).
Part number: 9-977-544-1X
..
..
.Interface Manual of Parallel I/O (50-pin) Connector
(Available on request)
This manual explains the protocol for controlling the VTR via the parallel (50-
pin).
Part number: 9-967-745-XX
..
..
.ISR Protocol Manual (Available on request)
This manual explains the ISR function (Interactive Status Reporting / Integrated
Equipment Management Function).
Part number: 9-967-614-XX
..
..
.“Semiconductor Pin Assignments” CD-ROM (Available on request)
This “Semiconductor Pin Assignments” CD-ROM allows you to search for
semiconductors used in this unit.
Semiconductors that cannot be searched for on this CD-ROM are listed in the
maintenance manual part 2 (volume-3) for the corresponding unit. The mainte-
nance manual part 2 (volume-3) contains a complete list of all semiconductors and
their ID Nos., and thus should be used together with the CD-ROM.
Part number: 9-968-546-XX
Trademarks Trademarks and registered trademarks used in this manual are follows.
.DOLBY is a trademark of Dolby Laboratories Licensing Corporation.