Sony SVT-RA40 User manual

TIME LAPSE VIDEOCASSETTE RECORDER
SVT-RA40
SVT-RA168
SERVICE MANUAL
1st Edition
COMPUTER INTRFACE BOARD
SVT-RS100

SVT-RA40/RA168
!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.

SVT-RA40/RA168
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 recommandépar 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.
ADVARSEL
Lithiumbatteri - Eksplosjonsfare.
Ved utskifting benyttes kun batteri som
anbefalt av apparatfabrikanten.
Brukt batteri returneres
apparatleverandøren.
VARNING
Explosionsfara vid felaktigt batteribyte.
Använd samma batterityp eller en likvärdig typ
som rekommenderas av apparattillverkaren.
Kassera använt batteri enligt gällande
föreskrifter.
VAROITUS
Paristo voi räjähtää jos se on virheellisesti
asennettu.
Vaihda paristo ainoastaan laitevalmistajan
suosittelemaan tyyppiin.
Hävitäkäytetty paristo valmistajan ohjeiden
mukaisesti.
1 (P)

1
SVT-RA40/RA168
Table of Contents
Manual Structure
Purpose of this manual .............................................................................................. 5
Related manuals......................................................................................................... 5
Contents ..................................................................................................................... 6
1. Service Overview
1-1. Maintenance Table on the Monitor Screen .................................................1-1
1-2. Removal of Cabinet, Mechanism Unit, and Main Board............................1-3
1-2-1. Removing the Cabinet Parts.......................................................1-3
1-2-2. Removing the Mechanism Main Unit and
the CP-1 PWB Assembly ...........................................................1-4
1-3. Temporarily Setting Up and Connecting CP-1 PWB Assembly ................1-5
1-4. Installation of the Front Panel .....................................................................1-5
1-5. Circuit Board Locations ..............................................................................1-6
1-6. Lithium Battery for Backup ........................................................................1-6
2. Mechanical Adjustments
1. Maintaining and Checking the Mechanism ....................................................2-1
1-1. Regular Checks and Maintenance Items .............................................2-1
1-1-1. Regular Checks ..........................................................................2-2
1-2. Service Tools and Cleaning ................................................................2-3
1-2-1. Service Tools..............................................................................2-3
1-2-2. Cleaning .....................................................................................2-4
2. An Overview of the Mechanism.....................................................................2-5
2-1. Names of the Main Parts .....................................................................2-5
2-1-1. Cassette Mechanism Assembly..................................................2-5
2-1-2. Topview......................................................................................2-6
2-1-3. Underside ...................................................................................2-7
2-2. An Overview of the Mechanism Modes .............................................2-8
2-2-1. Mechanism Mode Switching Table ...........................................2-8
2-2-2. Movement Check List for the Main Parts of the Mechanism ....2-9
2-2-3. How To Check The Mechanism Mode Position ........................2-9
2-2-4. Self-diagnosis Display ...............................................................2-9
3. Disassembling the Main Parts of the Mechanism.........................................2-10
3-1. How to Make the Mechanism Move .................................................2-10
3-1-1. Operating the Loading Motor by the Manual Method .............2-10
3-1-2. Making the Mechanism Move Using the Manual Method ......2-11
3-2. Mechanism Unit ................................................................................2-11

2SVT-RA40/RA168
3-3. Cassette Drive Mechanism ................................................................2-12
3-3-1. Cassette Mechanism Assembly ................................................2-12
3-3-2. Cassette Drive Gear..................................................................2-12
3-3-3. Door Opener, Under Frame and Stand L .................................2-13
3-3-4. Start Rack Gear and Front Rack Gear ......................................2-13
3-4. Cleaner Roller Assembly ..................................................................2-14
3-5. Cylinder (Drum) ................................................................................2-15
3-5-1. Cylinder (Drum) Motor, Upper Cylinder Assembly ................2-15
3-5-2. Cylinder Mounting ...................................................................2-16
3-6. FE Head and ACE Head ...................................................................2-17
3-6-1. Audio R/P Head Assembly (ACE Head) .................................2-17
3-6-2. Full Erase Head ........................................................................2-17
3-7. Capstan Motor ...................................................................................2-18
3-7-1. Capstan Motor ..........................................................................2-18
3-7-2. Capstan Brake Assembly .........................................................2-19
3-8. Loading Motor Assembly and Worm Gear Assembly......................2-19
3-9. Pinch Roller Pressur Mechanism ......................................................2-20
3-9-1. Pinch Roller Lever Assembly ..................................................2-20
3-9-2. Pinch Lift Cam and Pinch Cam Gear .......................................2-21
3-10. L Guide Act Lever Assembly, Load Lever Assembly and
Stopper Lever Assembly ...................................................................2-22
3-11. BT Lever Assembly ..........................................................................2-22
3-12. Reel Drive Mechanism......................................................................2-23
3-12-1. Reel Belt, Reel Pulley, Friction Gear Assembly and
Clutch Change Lever................................................................2-23
3-12-2. Clutch Mounting Assembly .....................................................2-23
3-12-3. S Soft Lever, Supply Reel Assembly and S Reel Gear ............2-24
3-12-4. T Soft Brake Assembly, Take Up Reel Assembly,
T Reel Gear ..............................................................................2-24
3-13. Brakes................................................................................................2-25
3-13-1. S Brake Assembly, T Brake Assembly, T Brake Act Slide .....2-25
3-13-2. Brake Control Lever and Brake Act Lever Assembly .............2-25
3-13-3. S Brake Act Slide and BT Spring Lever Assembly .................2-26
3-14. Guides ...............................................................................................2-27
3-14-1. Guide Roller Assembly ............................................................2-27
3-14-2. S and T Incline Mounting Assemblies .....................................2-27
3-15. Wheel Gear 2, Main Cam and OPT Pinch Relay Gear .....................2-28
3-16. Crescent Slide....................................................................................2-29
3-17. S Load Gear, T Load Gear, S Load Lever Assembly and
T Load Lever Assembly ....................................................................2-30
3-18. Tape Sensors, Reel Sensor and EP SW Lever ..................................2-31
3-18-1. Tape Top Sensor and Tape End Sensor ...................................2-31
3-18-2. Reel Sensor...............................................................................2-31
3-18-3. EP Switch Lever.......................................................................2-32

3
SVT-RA40/RA168
4. Mechanism Checks and Adjustments...........................................................2-33
4-1. Reel Table Torque Check..................................................................2-33
4-2. Adjusting the BT Lever Assembly Position and
Checking the Back Tension Torque in Play Mode ...........................2-34
4-2-1. BT Lever Pole Position Adjustment ........................................2-34
4-2-2. Checking the Back Tension Torque Play Mode ......................2-34
4-3. Tape Path Adjustment .......................................................................2-34
4-3-1. Adjustment Procedure ..............................................................2-35
4-3-2. Load Lever Assembly Height Adjustment...............................2-35
4-3-3. Guide Roller Height Adjustment .............................................2-36
4-3-4. Audio R/P Head (ACE Head) Height Adjustment,
Azimuth Adjustment and Horizontal Position Adjustment .....2-37
4-3-5. Checking After Adjustment .....................................................2-38
5. Test Points for Tape Path Adjustment ..........................................................2-38
3. Electrical Adjustments
3-1. Servo Circuit Adjustment............................................................................3-1
3-1-1. Test Equipment and Standards Required ...................................3-1
3-1-2. Location Of Adjustment Points..................................................3-1
3-1-3. Switching Position Adj. .............................................................3-2
3-1-4. 24 H Play Tracking Confirm and Adj. .......................................3-2
3-1-5. F. Slow Tracking Confirm and Adj............................................3-3
3-2. Video Circuit Adjustment ...........................................................................3-4
3-2-1. Test Equipment and Standards Required ...................................3-4
3-2-2. Comb Filter Adj. ........................................................................3-4
3-2-3. 2 H Delay Level Adj. .................................................................3-4
4. Spare Parts
4-1. Notes on Repair Parts..................................................................................4-1
4-2. Exploded Views ..........................................................................................4-2
4-3. Electrical Parts List .....................................................................................4-9
5. Semiconductors

4SVT-RA40/RA168
6. Block Diagrams
Overall Wiring ............................................................................................6-1
Mechanism Connection...............................................................................6-2
Audio Circuit...............................................................................................6-3
Video Circuit ...............................................................................................6-4
System Control & Servo Circuit .................................................................6-5
7. Schematic Diagrams
CT-1 Board (Option Board for SVT-RS100)..............................................7-1
IC002 Interface MPU Pin Function Table ..................................................7-1
CP-1 Board (VA-A) ....................................................................................7-2
Video Circuit Waveforms ...........................................................................7-4
IC301 System Control, Timer, OSC & Servo MPU Pin Function Table ...7-4
CP-1 Board (SY-A) .....................................................................................7-5
Servo Circuit Waveforms............................................................................7-6
Display (FLD) Grid/Anode Assignment Drawing & Table........................7-6
TM-1, TM-2 Board .....................................................................................7-7
PW-1 Board.................................................................................................7-8
8. Board Layouts
CP-1 Board ..................................................................................................8-1
TM-1 Board.................................................................................................8-2
TM-2 Board.................................................................................................8-2
CT-1 Board (Option Board for SVT-RS100)..............................................8-2
PW-1 Board.................................................................................................8-3

5
SVT-RA40/RA168
Purpose of this manual This manual is the Service Manual for the time lapse videocassette recorder
SVT-RA40/RA168 and the option board Computer Interface Board SVT-RS100.
This service manual provides the information of maintenance and detailed service
(parts replacement, guideline for adjustment, schematic diagrams, board layouts,
detailed parts list).
Related manuals In addition to this Service Manual, the following manuals are provided.
..
..
.Operating Instructions
SVT-RA40 (Supplied with Model SVT-RA40)
Part number: 3-206-678-XX
SVT-RA168 (Supplied with Model SVT-RA168)
Part number: 3-206-574-XX
SVT-RS100 (Supplied with Model SVT-RS100)
Part number: 3-206-934-XX
Manual Structure

6SVT-RA40/RA168
Contents This service manual is organized by following sections.
Section 1 Service Overview
Describes the information that is required to service (maintenance table on the
monitor screen, removal of cabinet, mechanism unit and main board, circuit board
locations, etc.).
Section 2 Mechanical Adjustments
Describes the recommended periodic maintenance, the cleaning procedure, service
tools, disassembling the main parts of the mechanism and tape path adjustment.
Section 3 Electrical Adjustments
Describes the electrical alignment for the maintenance of this unit.
Section 4 Spare Parts
Describes the exploded views, the mechanical parts list and the electrical parts list.
Section 5 Semiconductors
Describes information on semiconductors used for unit.
Section 6 Block Diagrams
Describes the overall wiring and the block diagrams of each board.
Section 7 Schematic Diagrams
Describes the schematic diagrams for the unit.
Section 8 Board Layouts
Describes the board layouts for the unit.

1-1
SVT-RA40/RA168
1-1. Maintenance Table on the Monitor Screen
To display the maintenance table, press “MENU” button with “REC/PLAY SPEED _(_)” button while
the fourth MENU <ALARM TIME> is displayed.
Section 1
Service Overview
Maintenance table 1
The used time of each mode (part) is displayed, and can be
reset by items.
Access the maintenance-screen according to the above,
and then Fig. below is displayed and VIDEO HEAD will
blink.
Move the blinking to the item to be reset with “TRACK-
ING – (
▼
) ” button and press the “MENU RESET”
button, and then the used time for the item will be reset.
When the “MENU RESET” button is pressed during
display and resetting all data.
VIDEO HEAD: Used time of the video head (cylinder)
total hours.
n
Reset when the cylinder is replaced.
POWER ON: Hours of the power supply being.
ALARM DATA: Number of ALARM REC.
Total counts of ALARM.
n
The data for the maintenance tables are memoried in E2
PROM, and the memory can be kept if the timer micro-
computer is reset.
Maintenance table 2
As shown in Fig. below Maintenance Table 2, <ERROR>
is displayed on the screen.
When the “MENU RESET” button is pressed during
display and resetting all data.
<ERROR> : Dates and error codes are displayed when
VCR happens to be in an abnormal condition
and the system is down.
The newest data is displayed in the first line,
and the old ones are moved down one by one.
Not-displayed old data is cleared automatical-
ly.
*ALARM DATA Maintenance table 1
Press “MENU” button with “REC/
PLAY SPEED –(_)” button
“TRACKING +
( )” button
Maintenance table 2
“MENU” buttonNormal screen
< MAINTENANCETABLE 1 >
USED TIME RESET
*VIDEO HEAD
*POWER ON
*ALARM DATA
NEXT TABLE :
0 0 0 0 0 H
0 0 0 0 0 H
0 0 0 0 0 0
< MAINTENANCETABLE 2 >
ERROR
DATE CODE POSITION
1 06 - 26 - 02 E01 08
2 - - - - - - - - - - - - - -
3 - - - - - - - - - - - - - -
4 - - - - - - - - - - - - - -
5 - - - - - - - - - - - - - -
6 - - - - - - - - - - - - - -
7 - - - - - - - - - - - - - -
8 - - - - - - - - - - - - - -

1-2 SVT-RA40/RA168
Error Codes (Self-Diagnosis Contents)
No. Problem Mechanism Operations and State After Occurrence
E01 The cylinder does not rotate.
The tape winds around the cylinder.
E02 The take-up reel does not rotate.
E03 The capstan motor does not rotate.
E04 The tape can not be loaded.
(But unloading can be performed.)
E05 The tape can be loaded with the cassette inserted.
But unloading can not be performed or the loading
and unloading cannot be performed with the
cassette inserted. (The tape guide is caught.)
E06 Front unloading cannot be performed when ejecting
the cassette. (Front loading can be performed.)
E07 Front loading and front unloading cannot be per-
formed when ejecting the cassette. (The cassette is
caught in the mechanism front.)
E09 The mechanism becomes 7 (INITIAL) while moving
from 1 (BRAKE), 2 (STOP), 3 (PLAY), 4 (STILL/
SLOW), and to 5 (REVERSE FRAME ADVANCE).
(The mechanism mode switch is faulty.)
E10 The capstan motor does not rotate, or the capstan
motor and the cylinder motor does not rotate with
the cassette inserted.
E11 The cylinder motor does not rotate with the cassette
inserted.
E12 The supply reel does the tape eject when tape
unloading.
E13 The tape cannot be loaded with the cassette
inserted.
E14 The tape cannot be loaded normally.
E15 The mechanism does not move to the correct
position after tape loading.
E16 Mechanism position “3”cannot be used during
intermittent recording.
Mechanism Mode Display Contents
Mode. No. Mechanism mode Mode. No. Mechanism mode Mode. No. Mechanism mode
00 CASSETTE OUT 09 REC 32 INTERMITTENT REC
01 STAND-BY 12 CUE 33 REVERSE STILL
02 STOP 13 REVIEW
03 STILL 14 FAST FORWARD
04 REC-PAUSE 15 REWIND
06 FRAME ADVANCE 30 REVERSE PLAY
08 PLAY 31 REVERSE FRAME ADVANCE
Shift to the STOP mode.
Unload forcibly.
Shift to the STOP mode.
Shift to the STOP mode.
Unload, shift to the ST-BY mode, and the power goes off.
The power is forcibly turned off with the mechanism at its current
position.
Front loading, shift to the STOP mode or ST-BY mode.
The power is forcibly turned off with the mechanism at its current
position.
Carry out the tape take-up operations, and shift to STOP mode.
Shift to the EJECT mode.
Shift to the EJECT mode.
Shift to the EJECT mode.
Shift to the EJECT mode.
Shift to the EJECT mode.
The power is forcibly turned off with the mechanism at its current
position.
Shift to the STOP mode.

1-3
SVT-RA40/RA168
1-2. Removal of Cabinet, Mechanism Unit, and Main Board
1-2-1. Removing the Cabinet Parts
1. Remove the cabinet and bottom cover by removing the four screws (1) and five
screws (2).
2. Remove the front panel by removing the locks of the clamps (A) using a
screwdriver, etc. and slightly rotating the bottom part in the direction of the
arrow.
m
.Electrical adjustments for the this model can be performed with only the cabinet
removed.
.When replacing the bottom cover, do not tighten the screws (2) too much. Excess
tightness may damage the screws taps on the chassis.
Fig. 1-1-1
2
2
2
2
2
Front Panel
Clamps (A)
Cabinet
Main Unit
Bottom Cover
1
1
1
1

1-4 SVT-RA40/RA168
1-2-2. Removing the Mechanism Main Unit
and the CP-1 PWB Assembly
1. Spread out the lock clamps (B) and (C) in the arrow
direction slightly and remove the TM-1 PWB and TM-
2 PWB as shown in Fig. 1-1-2.
2. Remove the screws (3), (4) and (5) at the chassis.
3. Remove the screw (6) at the PW-1 PWB.
4. Remove the two screws (7) at the CP-1 board.
5. Remove the two screws (8) of the mechanism unit.
The two screws (8) of the cassette tray can be removed
easily by pushing the tray lock lever in the arrow
direction to remove the lock as shown in the enlarge
view A and by pushing the lid opener lever in the
arrow direction to remove the lock as shown in the
enlarge view B.
6. Lift up the whole mechanism unit and main board
(CP-1 PWB assembly), and as shown in Fig. 1-1-3,
push the two lock clamps (D) of the chassis in the
arrow direction so that they can be removed from the
chassis.
Chassis
CP-1 PWB Assembly
Mechanism Main Unit
Clamp (D)
TM-1 PWB PW-1 PWB
TM-2 PWB
(B)
(B)
(B)(B)(B)
Tray Lock
Lever
(C)
Holder
Terminal Board
TM-2 PWB
TM-1 PWB
PW-1 PWB
Chassis
Cassette Tray
A
(B)
(B)
(C)
(C)
6
5
7
3
8
8
7
4
Lid Opener
Lever
B
Fig. 1-1-2
Fig. 1-1-3

1-5
SVT-RA40/RA168
1-4. Installation of the Front Panel
When installing the front panel to the chassis after repaires
and adjustments.
1. Pressing down the door opener lever of the mechanism
main unit.
2. Set the cassette door to half-opened state as shown in
Fig. 1-1-5, and install the front panel to the chassis.
n
Opened cassette door position does not install the front
panel to the chassis.
Fig. 1-1-5
1-3. Temporarily Setting Up and
Connecting CP-1 PWB Assembly
The following is an example of how to place and connect
the main board without a jig, when repairing the CP-1
PWB assembly.
1. Place the mechanism unit and main board up side
down as a whole on a flat surface with foil side of the
main board facing up.
2. Operete the unit using the buttons on TM-1 PWB and
TM-2 PWB.
Fig. 1-1-4
PW-1 PWB
Screws
CP-1 PWB Assembly (Foil side)
TM-1 PWB
Mechanism
Main Unit
Terminal Board
Cassette Compartment
TM-2 PWB
Jutted part of
Cassette Holder
Door Opener Lever
Front Panel
Cassette Door
(Position B)
Cassette Door
(Position A)

1-6 SVT-RA40/RA168
1-5. Circuit Board Locations
CP-1 PWB Assembly
TM-1 PWB
TM-2 PWB
PW-1 PWB
CT-1 PWB
(Option for SVT-RS100)
Soldered
CP-1 PWB assembly
Battery
1-6. Lithium Battery for Backup
This unit is equipped with a backup battery(lithium
battery) to maintain the clock settings.
For replacement, be sure to use the specified part.
Replacement part: Z3901/CP-1 board
Part description: MnO2-Li (lithium battery)
Part No.: 1-756-091-11
Replacement
1. Remove the cabinet and bottom cover. (Refer to
Section 1-2-1.Removing the Cabinet Parts)
2. Place the mechanism unit and CP-1 board up side
down as a whole on a flat surface with foil side of the
CP-1 board facing up. (Refer to Section 1-3.Tempo-
rarily Setting Up and Connecting CP-1 PWB Assem-
bly)
3. Unsolder the leads of the battery from the soldering
side of the CP-1 board and remove the battery.
Solder the backup battery in the reverse procedure of
removal.

2-1
SVT-RA40/RA168
1. Maintaining and Checking the Mechanism
1-1. Regular Checks and Maintenance Items
To obtain full function and maximum performance from the set, and to stop it getting dirty or scratched,
we recommend that you carry out the following maintenance procedures and regular checks. The mainte-
nance checks described in the following section should also be carried out without fail after carrying out
any repairs to the set.
Note: Oil and Grease
.Always use the specified brands of oil and grease. If you use a grease with the wrong viscosity, for
example, this can lead to all sorts of problems. Be careful to keep the oil and grease free of dust and
foreign bodies.
.A “drop” of oil is the amount of oil remaining on the tip of a rod with a diameter of 1. 5 mm after it is
dipped in oil to a depth of 1 cm and then taken out.
Section 2
Mechanical Adjustments

2-2 SVT-RA40/RA168
1-1-1. Regular Checks
Cleaning Check Oil Check, Replace
Part maintained Part Number Hours of use (H) Remarks
2000 4000 6000 8000
Band brake assembly 3-963-789-01
BT lever assembly 3-961-016-01
Full erase head 3-193-669-01
Cleaner roller assembly 3-977-067-01
Guide roller assembly 3-735-630-01
S incline mounting assembly 3-961-037-01
Tape path T incline mounting assembly 3-961-039-01
system ACE head A-8344-338-A
Pinch roller lever assembly 3-961-024-01
Pinch lift mounting 3-204-110-01
Pinch lift cam 3-961-027-01
Pinch cam gear 3-203-303-01
Cylinder chip earth 3-206-679-01
Cylinder complete A-8344-339-A ( ) ( )
Upper cylinder assembly 3-206-564-01 ( ) ( ) ( ) ( )
Supply reel assembly 3-977-065-01
Take up reel assembly 3-963-782-01
S reel gear 3-960-927-01
T reel gear 3-960-928-01
Reel drive Reel pulley 3-960-926-01
system Special washer 2.4 x6 x0.25 3-948-603-01
Clutch mounting complete A-8316-756-A
Reel belt 3-960-929-01
Capstan motor 3-203-331-01 ( ) ( )
Friction gear assembly 3-206-566-01
S brake assembly A-8325-366-A
Brake T brake assembly A-8325-367-A
system Capstan brake assembly A-8315-818-A
T soft brake assembly 3-963-784-01
Loading motor assembly 3-961-047-01
Damper 3-961-049-01
Worm gear complete 3-961-048-02
Main cam 3-206-567-01
Special washer 3.6 x0.5 3-973-491-01
Loading Wheel gear 1 3-961-050-01
drive Wheel gear 2 3-963-793-01
system Opt pinch relay gear 3-206-568-01
Crescent slide 3-203-305-01
S load gear 3-960-995-01
Front rack gear 3-961-305-01
Start rack gear 3-961-306-01
Pinion gear 3-960-960-01
Perform- Back tension torque PB back tension torque: 25~50 g.cm
ance FF, REW torque FF, REW: more than 600 g.cm
checks PLAY torque PLAY: 55~110 g.cm
REV torque REVIEW: 100~210 g.cm
This periodic maintenance check table changes considerably according to the using conditions and environment.
This is an annual periodic maintenance check table. Repeat this maintenance table every year.
As life may be shortened if foreign particles and dusts remain accumulated on the tape guides and rotating and contacting portions, clean if dirty.
Dusts and other foreign particles on the tape guides may also shorten the tape life and lower picture quality, therefore clean thoroughly.

2-3
SVT-RA40/RA168
1-2. Service Tools and Cleaning
1-2-1. Service Tools
Notes on Alignment Tapes
Alignment tape from the list below, according to the transmission system of the VCR you are repairing.
Models with 525 scanning lines and a field frequency of 60Hz
No. Tool Tool No. Remarks
1 Alignment tape (VHJ-0005) —————— SP colour bar 1 kHz (normal)
2 Alignment tape (VHJ-0006) —————— SP monoscope 7 kHz or 6 kHz (normal)
3 Alignment tape (VHJ-0007) —————— EP monoscope No Audio signal
4 Alignment tape (VSJ-1001) —————— EP Sync signal 3 kHz (normal)
5 Eccentric screw driver (VHJ-0003) J-6082-044-A Used to adjust the tape path
6 Nut box (VHJ-0048) J-6082-045-A Used to adjust the height of the lever
load assembly
7 Torque dial gauge (VHJ-0004) —————— Used to measure reel winding torque
8 Cassette torque meter (VHJ-0016) —————— Used to measure back tension torque
9 Load lever assembly height J-6431-410-A Used to adjust the height of the load
adjustment tool (VHJ-0111) lever assembly
10 Torque gauge screwdriver (VHJ-0014) J-6082-047-A Used to adjust the tightening torque of screws
11 3 mm dia. bit for torque screwdriver J-6082-048-A Used to replace the bit of the torque gauge
(VHJ-0045) screwdriver
12 Oil (VHJ-0099) 7-661-018-18 ——————
13 Grease (VHJ-0100) 7-661-000-11 ——————
14 Grease (VHJ-0101) J-6090-014-A ——————
15 Grease (VHJ-0114) —————— ——————
16 Upper drum fitting tool kit (VHJ-0112) —————— Used to reassemble the upper cylinder
(includes VHJ-0113)
17 Hexagonal wrench (VHJ-0113 ) —————— Spare hexagonal wrench for upper drum
fitting tool kit
No.1, 2, 3, 4 No. 5 No. 6 No. 7
No. 8 No. 9 No. 10
No. 12 No. 13, 14, 15
No. 17
No. 16
No. 11

2-4 SVT-RA40/RA168
1-2-2. Cleaning
1. Cylinder (Drum)
Moisten a chamois with methyl alcohol and clean the video
head and the tape path surface of the cylinder. Be sure to
wipe horizontally in relation to the video head. If you wipe
vertically, or use excessive force, you can damage the
video head.
2. Tape Path System / Reel Drive System
Clean the pinch roller, the capstan shaft, the tape guides,
the FE head, the ACE head, the reel table, the pulley and
the reel belt with a soft cloth, or chamois, moistened with
methyl alcohol.
n
If the dirt on the tape guide cannot be cleaned off, replace
the tape guide.
Fig. 1-2-2
Tape path surface Video head
Cylinder (Drum)