JVC HRS6700MS - Service Manual Immediate Download

SERVICE MANUAL

No. 82807

June 2000

HR-S6700MS/S7700MS

CARACTERISTIQUES TECHNIQUES (The specifications shown pertain specifically to the model HR-S7700MS)

MAGNETOSCOPE

Printed in Japan

VICTOR COMPANY OF JAPAN, LIMITED

VIDEO DIVISION

S40894

This service manual is printed on 100% recycled paper.

HR-S6700MS/S7700MS

No.

82807

GÉNÉRALES

Alimentation

: CA 220 V 240 V ` , 50 Hz/60 Hz

Consommation

Alimentation en marche : 25 W

Alimentation en veille

: 4,7 W

Températures

Fonctionnement

: 5°C à 40°C

Stockage

: -20°C à 60°C

Position de fonctionnement

: Seulement horizontale

Dimensions (LxHxP)

: 400 mm x 94 mm x 344 mm

Poids

: 4,3 kg

Format

: Standard S-VHS/VHS PAL/SECAM

Largeur de bande

: 12,65 mm

Vitesse de bande

(VN)

: 23,39 mm/s

(LD)

: 11,70 mm/s

Durée maximale d'enregistrement

(VN)

: 240 mn avec une cassette vidéo E-240

(LD)

: 480 mn avec une cassette vidéo E-240

VIDÉO/AUDIO

Système de signal

: Signaux couleur PAL/SECAM et signal

monochrome CCIR, 625 lignes/50 trames

Système d'enregistrement

: Balayage hélicoïdal DA4 (Double Azimuth)

Entrée

: 0,5 Vcc à 2,0 Vcc, 75 ohms, asymétrique

Sortie

: 1,0 Vcc, 75 ohms, asymétrique

Rapport signal/bruit

: 45 dB

Résolution horizontale : 400 lignes (S-VHS-PAL)

250 lignes (VHS-PAL)

240 lignes (VHS-SECAM)

Gamme de fréquence

: 70 Hz à 10.000 Hz (Audio normal)

20 Hz à 20.000 Hz (Audio Hi-Fi)

Entrée/sortie

: Connecteurs péritélévision à 21 broches :

ENTREE/SORTIE x 1, ENTREE/DECODEUR x 1

Connecteurs RCA:

ENTREE VIDEO x 1,

ENTREE AUDIO x 1,

SORTIE AUDIO x 1

Connecteurs S-Vidéo:

ENTREE x 1, SORTIE x 1

SYNTONISEUR

Système de syntonisation

: Syntoniseur à synthèse de fréquence

Capacité de canaux TV

: 99 positions (+ position AUX)

Canaux couverts

MINUTERIE

Référence de l'horloge

: Par quartz

Capacité de programmation : Minuterie sur 1 an/8 programmes

Durée de soutien mémoire : 60 mn

ACCESSOIRES

Accessoires fournis

: Câble RF,

Câble péritélévision à 21 broches,

Adaptateur antenne,

Contrôleur satellite RM-SD1,

Boîtier de télécommande à infrarouge,

Pile "R6" x 2,

Etiquettes S-VHS ET

ATTENTION:

Ce magnétoscope contient des microprocesseurs. Des bruits

électroniques externes ou des interférences peuvent causer un mauvais

fonctionnement. Dans de tels cas, couper l'alimentation et débrancher

le cordon d'alimentation. Puis le rebrancher et remettre l'alimentation.

Sortir la cassette. Après contrôle de la cassette, faire fonctionner

l'appareil comme d'ordinaire.

Les caractéristiques techniques sont pour le mode VN à moins

d'indication contraire.

Présentation et caractéristiques modifiables sans préavis.

Gamme

SECAM L

PAL B/G

Fréquence

Canaux

Fréquence

Canaux

VHF

49 MHz 65 MHz 2 4

47 MHz 89 MHz

E2 E4

(LOW)

X, Y, Z

E5 E12

VHF

104 MHz

5 10

104 MHz

S1 S20

(HIGH)

300 MHz

CATV

300 MHz

M1 M10

U1 U10

Hyper

300 MHz 470 MHz CATV

302 MHz 470 MHz S21 S41

UHF

470 MHz 862 MHz 21 69 470 MHz 862 MHz E21 E69

Important Safety Precautions

INSTRUCTIONS

1. DISASSEMBLY

1.1 DISASSEMBLY FLOW CHART ............................................................ 1-1

1.2 HOW TO READ THE DISASSEMBLY AND ASSEMBLY ...................... 1-1

1.3 DISASSEMBLY/ASSEMBLY METHOD ................................................ 1-1

1.4 SERVICE POSITION ............................................................................ 1-4

1.4.1 How to take out the Mechanism and Main board assemblies ......... 1-4

1.4.2 Precautions for cassette loading in the "SERVICE POSITION" ...... 1-5

1.4.3 Cassette loading and ejection methods in the

"SERVICE POSITION"(See Fig. 1-4-3). .......................................... 1-5

1.5 MECHANISM SERVICE MODE ........................................................... 1-5

1.5.1 How to set the "MECHANISM SERVICE MODE" ............................ 1-5

1.6 EMERGENCY DISPLAY FUNCTION ................................................... 1-6

1.6.1 Displaying the emergency information ............................................ 1-6

1.6.2 Clearing the emergency history ....................................................... 1-6

1.6.3 Emergency content description ....................................................... 1-7

1.6.4 Emergency detail information 1 ....................................................... 1-8

1.6.5 Emergency detail information 2 ....................................................... 1-9

1.7 SYSCON CIRCUIT ............................................................................. 1-10

1.7.1 Syscon CPU pin function (IC3001) 1/2 .......................................... 1-10

1.7.2 Syscon CPU pin function (IC3001) 2/2 .......................................... 1-11

2. MECHANISM ADJUSTMENT

2.1 BEFORE STARTING REPAIR AND ADJUSTMENT ............................. 2-1

2.1.1 Precautions ...................................................................................... 2-1

2.1.2 Checking for Proper Mechanical Operations ................................... 2-1

2.1.3 Manually Removing the Cassette Tape ........................................... 2-1

2.1.4 Jigs and Tools Required for Adjustment .......................................... 2-2

2.1.5 Maintenance and Inspection ............................................................ 2-3

2.2 REPLACEMENT OF MAJOR PARTS .................................................. 2-6

2.2.1 Before Starting Disassembling (Phase matching between mechanical parts) 2-6

2.2.2 How to Set the Mechanism Assembling Mode ................................ 2-6

2.2.3 Cassette Holder Assembly .............................................................. 2-6

2.2.4 Pinch Roller Arm Assembly ............................................................. 2-8

2.2.5 Guide Arm Assembly and Press Lever Assembly ............................ 2-8

2.2.6 Audio Control Head ......................................................................... 2-8

2.2.7 Loading Motor .................................................................................. 2-8

2.2.8 Capstan Motor ................................................................................. 2-9

2.2.9 Pole Base Assembly (supply or take-up side) ................................. 2-9

2.2.10 Rotary Encoder ........................................................................... 2-10

2.2.11 Clutch Unit .................................................................................. 2-10

2.2.12 Change Lever Assembly, Direct Gear, Clutch Gear and Coupling Gear 2-10

2.2.13 Link Lever ................................................................................... 2-11

2.2.14 Cassette Gear, Control Cam and Worm Gear ............................ 2-11

2.2.15 Control Plate ............................................................................... 2-11

2.2.16 Loading Arm Gear (supply or take-up side) and Loading Arm Gear Shaft 2-12

2.2.17 Take-up Lever, Take-up Head and Control Plate Guide ............. 2-13

2.2.18 Capstan Brake Assembly ........................................................... 2-13

2.2.19 Sub Brake Assembly (take-up side) ........................................... 2-13

2.2.20 Main Brake Assembly (take-up side), Reel Disk (take-up side)

and Main Brake Assembly (supply side) ..................................... 2-13

2.2.21 Tension Brake Assembly, Reel Disk (supply side) and Tension Arm Assembly 2-14

2.2.22 Idler Lever, Idler Arm Assembly .................................................. 2-14

2.2.23 Stator Assembly .......................................................................... 2-14

2.2.24 Rotor Assembly .......................................................................... 2-14

2.2.25 Upper Drum Assembly ................................................................ 2-15

2.3 COMPATIBILITY ADJUSTMENT ........................................................ 2-16

2.3.1 Checking/Adjustment of FM Waveform Linearity ........................... 2-16

2.3.2 Checking/Adjustment of the Height and Tilt of the Audio Control Head 2-17

2.3.3 Checking/Adjustment of the Audio Control Head Phase (X-Value) 2-17

2.3.4 Checking/Adjustment of the Standard Tracking Preset ................. 2-18

2.3.5 Checking/Adjustment of the Tension Pole Position ....................... 2-18

3. ELECTRICAL ADJUSTMENT

3.1 PRECAUTION ...................................................................................... 3-1

3.1.1 Required test equipments ................................................................ 3-1

3.1.2 Required adjustment tools ............................................................... 3-1

3.1.3 Color (colour) bar signal,Color (colour) bar pattern ......................... 3-1

3.1.4 Switch settings and standard precautions ....................................... 3-1

3.1.5 EVR Adjustment .............................................................................. 3-1

3.2 SERVO CIRCUIT .................................................................................. 3-2

3.2.1 Switching point ................................................................................ 3-2

3.2.2 Slow tracking preset ........................................................................ 3-2

3.3 VIDEO CIRCUIT ................................................................................... 3-2

3.3.1 D/A level .......................................................................................... 3-2

TABLE OF CONTENTS

Section

Title

Page

Section

Title

Page

3.3.2 EE Y level ........................................................................................ 3-3

3.3.3 PB Y level (S-VHS / VHS) ............................................................... 3-3

3.3.4 REC color (colour) level ................................................................... 3-3

3.3.5 Video EQ (Frequency response) ..................................................... 3-4

3.3.6 AUTO PICTURE initial setting ......................................................... 3-4

3.4 AUDIO CIRCUIT ................................................................................... 3-5

3.4.1 Audio REC FM ................................................................................. 3-5

3.5 PAL/SECAM CONVERTER CIRCUIT .................................................. 3-5

3.5.1 fH VCO ............................................................................................ 3-5

3.5.2 DEMOD Fo ...................................................................................... 3-5

3.5.3 Colour difference level ..................................................................... 3-6

3.5.4 PAL burst position ............................................................................ 3-6

4. CHARTS AND DIAGRAMS

NOTES OF SCHEMATIC DIAGRAM .......................................................... 4-1

CIRCUIT BOARD NOTES ........................................................................... 4-2

4.1 BOARD INTERCONNECTIONS .......................................................... 4-3

4.2 VIDEO/AUDIO AND AUDIO ERASE SCHEMATIC DIAGRAMS ..................... 4-5

4.3 SYSTEM CONTROL SCHEMATIC DIAGRAM .................................... 4-7

4.4 SWITCHING REGULATOR SCHEMATIC DIAGRAM ......................... 4-9

4.5 TUNER SCHEMATIC DIAGRAM ....................................................... 4-11

4.6 CONNECTION SCHEMATIC DIAGRAM ........................................... 4-13

4.7 2D DIGITAL SCHEMATIC DIAGRAM [HR-S6700MS] ....................... 4-15

4.8 3D DIGITAL/2M SCHEMATIC DIAGRAM [HR-S7700MS] ................. 4-17

4.9 TERMINAL SCHEMATIC DIAGRAM ................................................. 4-19

4.10 DEMODULATOR SCHEMATIC DIAGRAM ..................................... 4-21

4.11 S-SUB SCHEMATIC DIAGRAM ...................................................... 4-23

4.12 SW/DISPLAY, REC SAFETY, JACK AND SHUTTLE/PLAY

SCHEMATIC DIAGRAMS [HR-S6700MS] ....................................... 4-25

4.13 SW/DISPLAY, REC SAFETY, JACK AND JOG SCHEMATIC

DIAGRAMS [HR-S7700MS] ............................................................. 4-27

4.14 P/S CONVERTER SCHEMATIC DIAGRAM .................................... 4-29

4.15 SECAM SCHEMATIC DIAGRAM ..................................................... 4-31

4.16 MAIN, AUDIO ERASE, A/C HEAD AND LOADING MOTOR

CIRCUIT BOARDS ........................................................................... 4-35

4.17 2D DIGITAL CIRCUIT BOARD [HR-S6700MS] ............................... 4-37

4.18 3D DIGITAL/2M CIRCUIT BOARD [HR-S7700MS] ......................... 4-37

4.19 TERMINAL CIRCUIT BOARD .......................................................... 4-38

4.20 DEMODULATOR CIRCUIT BOARD ................................................ 4-39

4.21 S-SUB CIRCUIT BOARD ................................................................. 4-39

4.22 SW/DISPLAY, REC SAFETY, JACK AND SHUTTLE/PLAY

CIRCUIT BOARDS [HR-S6700MS] ................................................. 4-41

4.23 SW/DISPLAY, REC SAFETY, JACK AND JOG CIRCUIT BOARDS [HR-S7700MS] 4-43

4.24 P/S CONVERTER CIRCUIT BOARD .............................................. 4-45

4.25 SECAM CIRCUIT BOARD ............................................................... 4-47

4.26 REMOTE CONTROL SCHEMATIC DIAGRAM ............................... 4-48

4.27 FDP GRID ASSIGNMENT AND ANODE CONNECTION[HR-S6700MS] . 4-49

4.28 FDP GRID ASSIGNMENT AND ANODE CONNECTION[HR-S7700MS] . 4-50

4.29 VOLTAGE CHARTS ......................................................................... 4-51

4.30 SYSTEM CONTROL BLOCK DIAGRAM ......................................... 4-57

4.31 VIDEO BLOCK DIAGRAM ............................................................... 4-59

4.32 AUDIO BLOCK DIAGRAM ............................................................... 4-63

5. PARTS LIST

5.1 PACKING AND ACCESSORY ASSEMBLY <M1> ............................... 5-1

5.2 CABINET AND CHASSIS ASSEMBLY <M2> ...................................... 5-2

5.3 MECHANISM ASSEMBLY <M4> ......................................................... 5-4

5.4 ELECTRICAL PARTS LIST .................................................................. 5-6

MAIN BOARD ASSEMBLY <03> .............................................................. 5-6

2D DIGITAL BOARD ASSEMBLY(S6700MS)<05> ................................. 5-12

3D DIGITAL/2M BOARD ASSEMBLY(S7700MS) <05> .......................... 5-13

TERMINAL BOARD ASSEMBLY <06> ................................................... 5-14

AUDIO CONTROL HEAD BOARD ASSEMBLY <12> ............................ 5-16

DEMOD BOARD ASSEMBLY <14> ........................................................ 5-16

S-SUB BOARD ASSEMBLY <15> .......................................................... 5-17

DISPLAY BOARD ASSEMBLY(S6700MS) <28> .................................... 5-17

DISPLAY BOARD ASSEMBLY(S7700MS) <28> .................................... 5-18

REC SAFETY BOARD ASSEMBLY(S6700MS) <32> ............................ 5-19

REC SAFETY BOARD ASSEMBLY(S7700MS) <32> ............................ 5-19

S JACK BOARD ASSEMBLY(S7700MS) <36> ...................................... 5-19

S JACK BOARD ASSEMBLY(S6700MS) <36> ...................................... 5-19

JOG BOARD ASSEMBLY(S7700MS) <37> ............................................ 5-19

AUDIO ERASE BOARD ASSEMBLY <46> ............................................. 5-19

LOADING MOTOR BOARD ASSEMBLY <55> ....................................... 5-19

SHUTTLE/PLAY BOARD ASSEMBLY(S6700MS) <85> ......................... 5-19

P/S CONVERTER BOARD ASSEMBLY <87> ........................................ 5-20

SECAM BOARD ASSEMBLY <88> ........................................................ 5-22

HR-S6700MS

HR-S7700MS

JOG/SHUTTLE DIAL

SHUTTLE PLAY

JOG/SHUTTLE

FLYING ERASE HEAD

NOT USED

USED

INSERT EDIT

NOT USED

USED

DIGITAL 3R

NOT USED

USED

TBC/3D-MEMORY

NOT USED

USED/2M

AUDIO DUBBING

NOT USED

USED

HiFi LEVEL METER

NOT USED

USED

RE-TAKE (CM PAUSE)

NOT USED

USED

R.PAUSE

NOT USED

USED

The following table lists the differing points between Models (HR-S6700MS and HR-S7700MS) in this series.

Important Safety Precautions

Prior to shipment from the factory, JVC products are strictly inspected to conform with the recognized product safety and electrical codes of the

countries in which they are to be sold. However, in order to maintain such compliance, it is equally important to implement the following precautions

when a set is being serviced.

Fig.1

1. Locations requiring special caution are denoted by labels and in-

scriptions on the cabinet, chassis and certain parts of the product.

When performing service, be sure to read and comply with these

and other cautionary notices appearing in the operation and serv-

ice manuals.

2. Parts identified by the

! symbol and shaded (

) parts are

critical for safety.

Replace only with specified part numbers.

Note: Parts in this category also include those specified to com-

ply with X-ray emission standards for products using

cathode ray tubes and those specified for compliance

with various regulations regarding spurious radiation

emission.

3. Fuse replacement caution notice.

Caution for continued protection against fire hazard.

Replace only with same type and rated fuse(s) as specified.

4. Use specified internal wiring. Note especially:

1) Wires covered with PVC tubing

2) Double insulated wires

3) High voltage leads

5. Use specified insulating materials for hazardous live parts. Note

especially:

1) Insulation Tape

3) Spacers

5) Barrier

2) PVC tubing

4) Insulation sheets for transistors

6. When replacing AC primary side components (transformers, power

cords, noise blocking capacitors, etc.) wrap ends of wires securely

about the terminals before soldering.

Power cord

Fig.2

10. Also check areas surrounding repaired locations.

11. Products using cathode ray tubes (CRTs)

In regard to such products, the cathode ray tubes themselves, the

high voltage circuits, and related circuits are specified for compli-

ance with recognized codes pertaining to X-ray emission.

Consequently, when servicing these products, replace the cath-

ode ray tubes and other parts with only the specified parts. Under

no circumstances attempt to modify these circuits.

Unauthorized modification can increase the high voltage value and

cause X-ray emission from the cathode ray tube.

12. Crimp type wire connector

In such cases as when replacing the power transformer in sets

where the connections between the power cord and power trans-

former primary lead wires are performed using crimp type connec-

tors, if replacing the connectors is unavoidable, in order to prevent

safety hazards, perform carefully and precisely according to the

following steps.

1) Connector part number : E03830-001

2) Required tool : Connector crimping tool of the proper type which

will not damage insulated parts.

3) Replacement procedure

(1) Remove the old connector by cutting the wires at a point

close to the connector.

Important : Do not reuse a connector (discard it).

Fig.7

cut close to connector

Fig.3

(2) Strip about 15 mm of the insulation from the ends of the

wires. If the wires are stranded, twist the strands to avoid

frayed conductors.

15 mm

Fig.4

(3) Align the lengths of the wires to be connected. Insert the

wires fully into the connector.

Connector

Metal sleeve

Fig.5

(4) As shown in Fig.6, use the crimping tool to crimp the metal

sleeve at the center position. Be sure to crimp fully to the

complete closure of the tool.

·Precautions during Servicing

7. Observe that wires do not contact heat producing parts (heatsinks,

oxide metal film resistors, fusible resistors, etc.)

8. Check that replaced wires do not contact sharp edged or pointed

parts.

9. When a power cord has been replaced, check that 10-15 kg of

force in any direction will not loosen it.

1.2

2.0

5.5

Crimping tool

Fig.6

(5) Check the four points noted in Fig.7.

Not easily pulled free

Crimped at approx. center

of metal sleeve

Conductors extended

Wire insulation recessed

more than 4 mm

S40888-01

·Safety Check after Servicing

Examine the area surrounding the repaired location for damage or deterioration. Observe that screws, parts and wires have been returned

to original positions, Afterwards, perform the following tests and confirm the specified values in order to verify compliance with safety

standards.

1. Insulation resistance test

Confirm the specified insulation resistance or greater between power cord plug prongs and exter-

nally exposed parts of the set (RF terminals, antenna terminals, video and audio input and output

terminals, microphone jacks, earphone jacks, etc.). See table 1 below.

2. Dielectric strength test

Confirm specified dielectric strength or greater between power cord plug prongs and exposed acces-

sible parts of the set (RF terminals, antenna terminals, video and audio input and output terminals,

microphone jacks, earphone jacks, etc.). See table 1 below.

3. Clearance distance

When replacing primary circuit components, confirm specified clearance distance (d), (d') be-

tween soldered terminals, and between terminals and surrounding metallic parts. See table 1

below.

4. Leakage current test

Confirm specified or lower leakage current between earth ground/power cord plug prongs and

externally exposed accessible parts (RF terminals, antenna terminals, video and audio input and

output terminals, microphone jacks, earphone jacks, etc.).

Measuring Method : (Power ON)

Insert load Z between earth ground/power cord plug prongs and externally exposed accessible

parts. Use an AC voltmeter to measure across both terminals of load Z. See figure 9 and following

table 2.

5. Grounding (Class 1 model only)

Confirm specified or lower grounding impedance between earth pin in AC inlet and externally exposed accessible parts (Video in, Video out,

Audio in, Audio out or Fixing screw etc.).

Measuring Method:

Connect milli ohm meter between earth pin in AC inlet and exposed accessible parts. See figure 10 and grounding specifications.

Fig. 10

Fig. 9

Fig. 8

Table 1 Specifications for each region

Table 2 Leakage current specifications for each region

Note: These tables are unofficial and for reference only. Be sure to confirm the precise values for your particular country and locality.

S40888-01

Externally

exposed

accessible part