Sony DVW-250 User manual
MAINTENANCE MANUAL Part 1
1st Edition (Revised 2)
Serial No. 10001 and Higher
DVW-250/250P
DIGITAL VIDEOCASSETTE RECORDER
!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.
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 må kun ske med batteri
af samme fabrikat og type.
Levér det brugte batteri tilbage til leverandøren.
1
DVW-250/250P
Table of Contents
Manual Structure
Purpose of this manual .............................................................................................. 7
Contents ..................................................................................................................... 7
Relative manual ......................................................................................................... 8
1. Service Overview
1-1. Operating Conditions ..................................................................................1-1
1-2. Locations of Main Part and Functions of Printed Circuit Board ................1-2
1-2-1. Functions of Printed Circuit Board and
Printed Circuit Board Location ..................................................1-2
1-2-2. Main Mechanical Part Locations ...............................................1-5
1-2-3. Function and Location of Sensors..............................................1-6
1-3. Matching Connectors ..................................................................................1-8
1-4. Signal Input/Output.....................................................................................1-9
1-5. Removal/Installation of Cabinet ...............................................................1-12
1-6. Cassette Compartment Removal/Installation............................................1-14
1-7. Connector Panel Removal/Installation......................................................1-14
1-8. Battery Terminal Replacement .................................................................1-15
1-9. Fuse Replacement .....................................................................................1-15
1-10. Switch/Slit Land Settings on the Boards...................................................1-16
1-10-1. CP-260 board ...........................................................................1-16
1-10-2. ADA-44 board..........................................................................1-18
1-10-3. DIF-31 board ............................................................................1-19
1-10-4. DPR-62 board...........................................................................1-20
1-10-5. EQ-54 board .............................................................................1-21
1-10-6. SST-3 board .............................................................................1-22
1-10-7. VPR-12 board...........................................................................1-23
1-11. Ejecting the Cassette Tape Manually ........................................................1-24
1-12. Cleaning when the Heads are Clogged .....................................................1-25
1-13. Tracking/Audio Meter Adjustment ...........................................................1-25
1-13-1. Tracking Adjustment................................................................1-25
1-13-2. Audio Meter Contrast Adjustment ...........................................1-25
1-14. Optional Accessories.................................................................................1-25
1-14-1. Optional Accessories................................................................1-25
1-14-2. Fixture ......................................................................................1-26
1-14-3. Measuring Equipment ..............................................................1-29
2. Error Messages
2-1. Error Message .............................................................................................2-1
2DVW-250/250P
3. Maintenance Mode
3-1. Setup Menu .................................................................................................3-1
3-2. DIAG Menu ................................................................................................3-5
3-3. ISR.............................................................................................................3-12
4. Block Diagrams and Circuit Description
5. Periodic Maintenance and Inspection
5-1. Cleaning ......................................................................................................5-1
5-1-1. General Information for Cleaning ..............................................5-1
5-1-2. Cleaning of Tape Running Surface of Upper Drum
and Video Heads ........................................................................5-2
5-1-3. Cleaning of Tape Running Surface of Lower Drum
and Lead Surface ........................................................................5-3
5-1-4. Stationary Heads Cleaning .........................................................5-4
5-1-5. Cleaning of Tape Running System and Tape Cleaner ...............5-5
5-2. Periodic Check ............................................................................................5-6
5-2-1. Hours Meter ...............................................................................5-6
5-2-2. Periodic Check List ....................................................................5-6
DVW-250/250P Periodic Replacement List ..............................5-7
5-3. Cares after Using at Special Environment ..................................................5-8
6. Replacement of Mechanical Parts
6-1. General Information for Mechanical Part Replacement .............................6-1
6-1-1. Caution .......................................................................................6-1
6-1-2. Threading End/ Unthreading End Mode ....................................6-2
6-1-3. Parts Location of Periodical Replacement Parts ........................6-4
6-1-4. Other Cautions ...........................................................................6-5
6-1-5. Reel Table Position ....................................................................6-7
6-2. Brush Replacement .....................................................................................6-9
6-3. Slip Ring Assembly Replacement.............................................................6-12
6-4. Upper Drum Assembly Replacement........................................................6-14
6-5. Drum Assembly Replacement...................................................................6-21
6-6. Driving Belt Replacement .........................................................................6-27
6-7. Pinch Roller Arm Assembly Replacement ...............................................6-29
6-8. Video Head Cleaning Roller Replacement ...............................................6-31
6-9. Cue Brush Replacement ............................................................................6-34
6-10. Pinch Solenoid Assembly Replacement....................................................6-35
6-11. Tension Regulator Roller Replacement ....................................................6-37
6-12. S Reel Brake Solenoid Replacement.........................................................6-41
3
DVW-250/250P
6-13. T Reel Brake Solenoid Replacement ........................................................6-45
6-14. Video Head Cleaner Solenoid Replacement .............................................6-53
6-15. Capstan Motor Replacement .....................................................................6-55
6-16. CTL Head Replacement............................................................................6-58
6-17. CUE/TC Head Replacement .....................................................................6-62
6-18. Threading Motor Replacement .................................................................6-68
6-19. Battery Replacement .................................................................................6-72
6-20. Cassette Compartment Harness Replacement...........................................6-74
6-21. S Reel Motor Assembly Replacement ......................................................6-76
6-22. T Reel Motor Assembly Replacement ......................................................6-80
6-23. S Arm Assembly Replacement .................................................................6-87
6-24. T Link and T Drawing Arm Replacement ................................................6-91
6-25. Replacement of the Component of the Threading Link Block .................6-95
7. Tape Path Alignment
7-1. General Information for Tape Path Adjustment..........................................7-1
7-1-1. Tape Path Adjustment Flow.......................................................7-1
7-1-2. Locations of Tape Running System ...........................................7-2
7-1-3. Notes ..........................................................................................7-3
7-1-4. Preparations................................................................................7-4
7-1-5. Tools...........................................................................................7-4
7-2. Tape Path Adjustment .................................................................................7-5
7-2-1. S3/S5 Tape Guides Height Adjustment .....................................7-5
7-2-2. CTL Head Height Adjustment ...................................................7-9
7-2-3. CTL Head Position Adjustment ...............................................7-11
7-2-4. DIP Switch Setting ...................................................................7-13
7-2-5. S1 Guide Slantness Adjustment ...............................................7-14
7-2-6. S2 Guide Height Adjustment ...................................................7-16
7-2-7. S Side Tape Running Check ....................................................7-18
7-2-8. T1 Guide Slantness Adjustment...............................................7-21
7-2-9. T2 Guide Height Adjustment ...................................................7-23
7-2-10. Alignment Tape Tracking Check .............................................7-25
7-2-11. T3 Guide Height Adjustment ...................................................7-27
7-2-12. CUE/TC Head Position Adjustment ........................................7-31
7-2-13. CUE/TC Head Height Adjustment...........................................7-33
7-2-14. CUE/TC Head Azimuth Adjustment .......................................7-35
7-2-15. Drum PG Phase Adjustment ....................................................7-37
7-2-16. CTL Head Position Check .......................................................7-39
7-2-17. DIP Switch Re-setting..............................................................7-41
7-2-18. Self REC/PB Tracking Check ..................................................7-42
7-2-19. Tape Running Check................................................................7-45
7-2-20. Locking Compound Applying..................................................7-50
7-3. Mechanical Alignment ..............................................................................7-51
7-3-1. Tension Regurator Adjustment ................................................7-51
4DVW-250/250P
8. Replacement of Circuit Boards
8-1. General Information for Boards Replacement ............................................8-1
8-2. Video Boards Assembly Replacement ........................................................8-1
8-2-1. Opening/Removal of Video Boards Assembly ..........................8-1
8-2-2. DIF-31 Board Removal ..............................................................8-3
8-2-3. VPR-12 Board Removal ............................................................8-4
8-2-4. DPR-62 Board Removal ............................................................8-4
8-3. SST-3 Board Removal ................................................................................8-5
8-4. KY-315 Board Removal .............................................................................8-6
8-5. ADA-44 Board Removal.............................................................................8-7
8-6. EQ-54 Board Replacement .........................................................................8-8
8-7. DC/DC Converter Removal ........................................................................8-8
9. Electrical Alignment
9-1. General Information for Electrical Adjustment ..........................................9-1
9-1-1. Notes for Adjustment .................................................................9-1
9-1-2. Equipment/Fixtures ....................................................................9-1
9-1-3. Initial settings for switches.........................................................9-2
9-1-4. Test Signals ................................................................................9-2
9-1-5. Adjustment after Replacement of Boards and/or Blocks ...........9-3
9-2. Power/Control System Adjustment .............................................................9-4
9-2-1. SST-3 Board Voltage Adjustment .............................................9-4
9-3. Servo System Adjustment ...........................................................................9-4
9-3-1. EEPROM Data Initialize ............................................................9-4
9-3-2. Click Position Correction of Tracking Volume .........................9-5
9-3-3. Capstan FG Duty Adjustment ....................................................9-5
9-3-4. Capstan Free Speed Adjustment ................................................9-6
9-3-5. Drum PG Phase Adjustment ......................................................9-6
9-3-6. Save the Servo Data ...................................................................9-7
9-4. Audio System Adjustment ..........................................................................9-8
9-4-1. PB Level/Distortion Adjustment ................................................9-8
9-4-2. INPUT Level Adjustment ..........................................................9-8
9-4-3. DC Offset Adjustment................................................................9-9
9-4-4. CUE ERASE Current Adjustment ...........................................9-10
9-4-5. CUE Channel PB Frequency Response Adjustment ................9-10
9-4-6. CUE Bias Adjustment ..............................................................9-11
9-4-7. CUE REC Level Adjustment ...................................................9-12
9-5. RF System Adjustment .............................................................................9-14
9-5-1. RF Parameter Initialize ............................................................9-16
9-5-2. Transversal Filter Adjustment ..................................................9-16
9-5-3. PLL Adjustment .......................................................................9-17
9-5-4. Phase Adjustment .....................................................................9-18
9-5-5. ADC V-ref Adjustment ............................................................9-18
9-5-6. ADC Sampling Phase Adjustment ...........................................9-19
5
DVW-250/250P
9-5-7. Equalizer (AMP) Adjustment ..................................................9-20
9-5-8. Recording Current Adjustment ................................................9-20
9-5-9. Equalizer (PHASE) Adjustment ..............................................9-21
9-5-10. REC CONFI Channel Condition Check ..................................9-21
9-5-11. Self REC/PB Channel Condition Check ..................................9-22
9-5-12. Alignment Tape Playback Channel Condition Check .............9-22
9-5-13. Save the Adjustment Data ........................................................9-22
9-5-14. Manual Adjustment ..................................................................9-23
9-5-15. Setting after RF Adjustment.....................................................9-24
9-6. Video System Adjustment-1 .....................................................................9-24
9-6-1. Frequency Adjustment .............................................................9-24
9-7. Video System Adjustment-2 .....................................................................9-25
9-7-1. Pedestal Level Adjustment.......................................................9-25
9-7-2. Composite Input Level Adjustment .........................................9-26
9-7-3. CAMERA RETURN VIDEO Level Adjustment ....................9-27
9-7-4. INPUT SYNC Level Adjustment.............................................9-27
10. Spare Parts
10-1. Notes on Spare Parts .................................................................................10-1
10-2. Exploded Views ........................................................................................10-2
DVW-250/250P 7
Purpose of this manual This manual is the maintenance manual of Digital Videocassette Recorder DVW-
250/250P.
This manual describes the maintenance information of this unit, and the information
on primary services such as the replacement of main blocks and circuit boards.
Contents The following is a summary of the sections for understanding the contents of this
manual.
Section 1 Service Overview
Explains the locations of main part, the functions of printed circuit board, the
removal and installation of cabinet, and the measures against trouble.
Section 2 Error Message
Explains the error messages.
Section 3 Maintenance Mode
Explains the maintenance mode of this unit.
Section 4 Overall Block Diagrams and Circuit Descriptions
Describes the overall block diagrams and the circuit descriptions.
Section 5 Periodic Maintenance and Inspection
Explains the cleaning procedures and periodic checks.
Section 6 Replacement of Mechanical Parts
Explains how to replace the parts that should replace periodically and how to adjust
them after the replacement.
Section 7 Tape Path Alignment
Explains the adjustment procedures of tape path system.
Section 8 Replacement of Circuit Boards
Explains how to replace the main boards.
Section 9 Electrical Alignment
Explains the general information for electrical adjustments and the electrical adjust-
ments of this unit.
Section 10 Spare Parts
Describes the exploded views for the unit and mounted/printed circuit boards list.
Manual Structure
DVW-250/250P
8
Relative manual Besides this “Maintenance Manual 1”, the following manuals are available for this
unit.
• Operation Manual (Supplied with this unit.)
This manual is necessary for application and operation of this unit.
• Maintenance Manual Part 2 (Not supplied with this unit.)
This manual describes the information items (adjustments, board layouts, sche-
matic diageams, detailed parts list, etc.) that premise the service based on parts.
If this manual is required, please contact to Sony’s service organization.
This manual suits for next models
1
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