JVC HR-S6700MS, HR-S7700MS Service Manual

HR-S6700MS/S7700MS

SERVICE MANUAL

MAGNETOSCOPE

HR-S6700MS/S7700MS

VICTOR COMPANY OF JAPAN, LIMITED VIDEO DIVISION

S40894

No. 82807

CARACTERISTIQUES TECHNIQUES

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

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

SYNTONISEUR

Système de syntonisation : Syntoniseur à synthèse de fréquence Capacité de canaux TV : 99 positions (+ position AUX) Canaux couverts

Gamme

VHF (LOW) X, Y, Z

VHF 104 MHz 5 – 10 104 MHz S1 – S20 (HIGH) – 300 MHz CATV – 300 MHz M1 – M10

Hyper UHF

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,

49 MHz – 65 MHz

300 MHz – 470 MHz 470 MHz – 862 MHz

Les caractéristiques techniques sont pour le mode VN à moins d’indication contraire. Présentation et caractéristiques modifiables sans préavis.

SECAM L PAL B/G

Fréquence Canaux Fréquence Canaux

2 – 4

CATV302 MHz – 470 MHz 21 – 69

Câble péritélévision à 21 broches, Adaptateur antenne, Contrôleur satellite RM-SD1, Boîtier de télécommande à infrarouge, Pile “R6” x 2, Etiquettes S-VHS ET

47 MHz – 89 MHz

470 MHz – 862 MHz

E2 – E4

E5 – E12

U1 – U10 S21 – S41 E21 – E69

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.

Printed in Japan

This service manual is printed on 100% recycled paper.

No. 82807

June 2000

Section Title Page Section Title Page

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)

2.2.2 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

2.2.13 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

2.2.17 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

2.2.22 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

2.3.3 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

2-6

2-10

2-12

2-14

2-17

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 .....................

4.3 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]

4.24 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] .

4.28

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

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

4-5

4-43

4-49 4-50

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

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

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.

Precautions during Servicing

•

1. Locations requiring special caution are denoted by labels and inscriptions 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 service 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.

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 transformer primary lead wires are performed using crimp type connectors, 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).

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.1

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.

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 compliance with recognized codes pertaining to X-ray emission. Consequently, when servicing these products, replace the cathode 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.

Fig.4

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

wires fully into the connector.

Metal sleeve

Connector

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.

Fig.6

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

Not easily pulled free

Wire insulation recessed

more than 4 mm

Fig.7

Crimping tool

Crimped at approx. center

of metal sleeve

Conductors extended

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 externally 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 accessible 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’) between soldered terminals, and between terminals and surrounding metallic parts. See table 1 below.

Fig. 8

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.

Externally exposed accessible part

Fig. 9

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

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

SECTION 1

DISASSEMBLY

This flowchart lists the disassembling steps for the cabinet parts and P.C. boards in order to gain access to item(s) to be serviced. When reassembling, perform the step(s) in reverse order. Bend, route and dress the flat cables as they were originally laid.

1.2

HOW TO READ THE DISASSEMBLY AND ASSEMBLY

Step/

Loc No.

1 Top cover, D1

(1) (2) (3) (4) (5)

(1) Order of steps in Procedure

When reassembling, perform the step(s) in the reverse order. These numbers are also used as the identification (location) No.

of parts Figures. (2) Part name to be removed or installed. (3) Fig. No. showing procedure or part location. (4) Identification of part to be removed, unhooked, unlocked,

released, unplugged, unclamped or unsoldered.

P= Spring, W= Washer, S= Screw, L= Locking tab, SD= Solder,

CN**(WR**)= Remove the wire (WR**) from the connector

(CN**).

Note:

• The bracketed ( ) WR of the connector symbol are as-

signed nos. in priority order and do not correspond to those on the spare parts list.

(5) Adjustment information for installation

Part Name

Bracket 2(S1c)

Top cover, Bracket

Bottom cover

Front panel assembly

Drum assembly

Mechanism assembly

SW/Display board assembly

P/S Converter board assembly

Main board assembly

Fig. No.

Point Note

4(S1a),(S1b),3(L1a), <Note 1> 2(SD1a),(P1a), CN1(WR1a),

1.3 DISASSEMBLY/ASSEMBLY METHOD1.1 DISASSEMBLY FLOW CHART

Step/

Loc No.

• When attaching the Bottom cover, make sure that the Earth plate of the Bottom cover is passed through the hole of the Bottom chassis and then touches the GND (Ground) on the Main board assembly.

• Be careful not to damage the connector and wire etc. during connection and disconnection. When connecting the wire to the connector, be careful with the wire direction.

• When reattaching the Front panel assembly, make sure that the door opener in position prior to the reinstallation.

• When it is required to remove the screws (S5a) retaining the Mechanism assembly, please refer to the “Procedures for Lowering the Cassette holder assembly”(See on pages 1-2).

• When removing the Mechanism assembly only, unhook the two spacers connecting it with the Main board assembly with pliers from the back side of the Main board assembly first, and then remove the Mechanism assembly.

• When reattaching the Mechanism assembly to the Main board assembly, take care not to damage the sensors on the Main board assembly (D3001: LED, Q3002: Start sensor, Q3003: End sensor, S3002 : S cassette switch).

• The wire (WR5) has excess length that may be loose, as it is quite long. After inserting the wire and connectors, the loose portion of the wire should be taken up and accommodated between the A/C head base and the main deck.

• The REC safety board assembly is attached to the SW/Display board assembly. It is therefore necessary to remove the REC safety board assembly before removing the SW/Display board assembly.

Part Name

Top cover, D1 4(S1a), (S1b) Bracket 2(S1c)

Bottom cover D2 4(L2a),3(L2b),(S2a), <Note 2>

Front panel assembly D3

Drum assembly D4

(Inertia plate) 4(L4a) (Roller arm assy) (P4), (L4b)

Mechanism assembly D5 2(S5a),(S5b),(S5c),

SW/Display board D6 CN7001(WR6a), assembly CN7191(WR6b),

P/S Converter board D7 2(S7), assembly CN3501(WR7a),

Main board assembly D8 2(S8), (L8)

a of the Cassette holder assembly is lowered

Fig. No.

Point Note

------------------

2(S2b)

------------------

Earth plate

7(L3),CN901(WR3a), CN7002(WR3b) [HR-S6700MS] CN3012(WR3b) [HR-S7700MS]

------------------

2(S3),Jack board assy

3(S4),CON1(WR4a), CN1(WR4b)

------------------

2(L5), CN1(WR5)

(L6a), REC safety board assy, 2(L6b), 5(L6c)

CN3502(WR7b)

1-1

Procedures for Lowering the Cassette holder assembly

As the mechanism of this unit is integrated with the Housing assembly, the holder must be lowered and the two screws unscrewed when removing the Mechanism assembly.

Fig. 2

(L2b)

(L2a)

Fig. 1

Fig. 3

Turn the loading motor pulley in the direction as indicated by Fig.2. As both

and ı levers are lodged twice, push the

levers in the direction as indicated by Fig.3 to release them. When pushing the levers, do it in the order of

Å, ı, ı, Å

When the holder has been lowered, turn the pulley until the cassette holder is securely in place without allowing any up/ down movement.

Procedures for Lowering the Cassette holder assembly

(S1a)

(S1b)

Top cover

Earth plate

(S2a)

(S2b)

Fig. D2

WR3a Foil side <Note 3a>

(L3)

CN901

CN3012 [HR-S7700MS]

1-2

(S1c)

(S1a)

(S1c)

Bracket

(L3)

Jog shuttle

Front panel back side

Jack board assembly

(L3)

CN7192

Fig. D1 Fig. D3

WR3b Foil side <Note 3a>

WR3a

(S3)

CN7002 [HR-S6700MS]

a <Note 3b>

Note: When installing the Drum assembly, secure the

(L6c)

CN7001

(L6b)

CN7191

(L6a)

REC Safety board assembly <Note 6>

WR6b Foil side <Note 3a>

WR6a Supporting tape side <Note 3a>

screws (S4) in the order of a , b , c .

Roller arm assy

WR5

Inertia plate

(L4a)

(P4)

(L4b)

A/C head base

(S4)

CON1

WR4a Foil side <Note 3a>

(S4)

CN1

Fig. D4

Note: When installing the Mechanism assembly, secure the screws (S5a) in the order of a , b .

WR4b Foil side <Note 3a>

Cleaner assy

(L4c)

Not use

Fig. D6

Q3003 End sensor <Note 5a>

(L5) Spacer <Note 5a>

D3001 LED <Note 5a>

(S5a) <Note 5a>

S3002 S cassette switch <Note 5a>

Fig. D5

(S5b)

CN1

WR5 Foil side <Note3a> <Note 5b>

(S5c)

(L5) Spacer <Note 5a>

Q3002 Start sensor <Note 5a>

Foil side

(S7)

WR7a

CN3501

WR7b

(S7)

CN3502

Fig. D7

1-3

(S8)

(L8)

Fig. D8

1.4 SERVICE POSITION

In order to facilitate diagnosis and the repair of the Mechanism assembly, this unit is constructed so as to allow the Mechanism and Main board assemblies to be removed together from the Bottom chassis assembly.

1.4.1 How to take out the Mechanism and Main board assemblies

(1) Remove the Top cover, Bracket, Front panel assembly

and Jack board assembly. (Refer to 1.3 DISASSEMBLY/ ASSEMBLY METHOD. )

(2) Lower the cassette holder, and make the preparations re-

quired in order to remove the screws from the Mechanism assembly. (Refer to the “Procedures for Lowering the Cassette holder assembly” on pages 1-2 of 1.3 DISASSEMBLY/ASSEMBLY METHOD.)

(3) Take out 2 screws

, 1 screw ı and 1 screw Ç as

shown in Fig. 1-4-1.

(4) Remove the flat wires from CN3011 and CN902 on the

Main board assembly.

(5) Take out 2 screws

and 1 screw ´ as shown in Fig. 1-

4-1.

(6) Take out 2 screws

as shown in Fig. 1-4-1. Then re-

move the P/S Converter board assembly. (Refer to 1.3 DISASSEMBLY/ASSEMBLY METHOD.)

(7) Remove the hook

while holding the edge of the Main

board assembly, and remove the Main board and Mechanism assemblies together. At this stage be careful of the power cord and prongs of the jacks on the back side. (Refer to Fig. 1-4-2.)

(8) Remove the SW/Display board assembly and REC safety

board assembly. (Refer to page 1-3 of 1.3 DISASSEMBLY/ASSEMBLY METHOD. Take care not to pull the flat wires (Fig. D7) from CN7001 and CN7191.)

Fig. 1-4-2

(9) Place the SW/Display board assembly, REC safety board

assembly, Jack board assembly and P/S Converter board assembly on the front side and left side of the Mechanism and Main board assemblies which was removed at the step (7), then connect the flat wires into CN3011, CN901 and CN902 of the Main board assembly, CN3501 and CN3502 of the P/S Converter board assembly. (Refer to Fig. 1-4-3.)

P/S Converter board Assembly

CN3502

CN3501

Jack board

Assembly

CN7192

CN6102

1-4

CN901

REC safety board

Assembly

CN902

CN3011

SW/Disply board Assembly

CN3012

Main board

Assembly

To Jog

Fig. 1-4-3

(10)

Fig. 1-4-1

Connect the power cord to the wall socket, and lift the cassette holder. (Before turning on the power make sure that there is nothing which may produce a short circuit, such as faulty soldering.)

Note:

• When carrying out diagnosis and repair of the Main board assembly in the service position, be sure to ground both the Main board and the Mechanism assemblies.

If they are improperly grounded, there may be noise on the playback picture or the FDP counter display may move even when the mechanism is kept in an inoperative status.

• In the "SERVICE POSITION", the cassette tabs cannot be detected and recording becomes possible even with a cassette with broken tabs such as the alignment tape. Be very careful not to erase important tapes.

(5) The switch on the REC safety board assembly does not

have to be operated when ejecting a tape. But be sure to turn the set to the normal position before ejecting the tape.

1.4.2 Precautions for cassette loading in the "SERVICE POSITION"

The REC safety board assembly detects cassette loading as well as cassette tabs. Therefore, after the assembly has been removed in the "SERVICE POSITION", it is required to set the switch manually on the REC safety board assembly when a cassette is loaded.

1.4.3 Cassette loading and ejection methods in the “SERVICE POSITION”(See Fig. 1-4-3).

(1)

Insert a cassette halfway in the Cassette holder assembly.

(2) Set the switch on the REC safety board assembly to ON

(by pressing the switch).

(3) As soon as the cassette starts to be loaded, set the switch

on the REC safety board assembly to OFF (by releasing the switch).

(4) Now the desired operation (recording, playback, fast for-

ward, rewind, etc.) is possible in this status (the status shown in Fig.1-4-3).

Notes:

• When performing diagnostics of the tape playback or

the recording condition in the "SERVICE POSITION", enter the desired mode before turning the set upside down, and do not change the mode when performing diagnostics while the set is placed upside down. If you want to switch the mode, turn the set to the normal position (the status shown in Fig.1-4-3).

1.5 MECHANISM SERVICE MODE

This model has a unique function to enter the mechanism into every operation mode without loading of any cassette tape. This function is called the “MECHANISM SERVICE MODE”.

1.5.1 How to set the "MECHANISM SERVICE MODE"

(1) Disconnect VCR from AC. (2) Connect TPGND and TP7001 (TEST) on the SW/Display

board assembly with a jump wire. (3) Connect VCR to AC. (4) Press the POWER button. (5) With lock levers

on the left and right of the Cassette

Åı

holder assembly pulled toward the front, slide the holder

in the same direction as the cassette insertion direction.

(For the positions of lock levers

, refer to the “Pro-

Åı

cedures for Lowering the Cassette holder assembly” on

pages 1-2 of 1.3 DISASSEMBLY/ASSEMBLY METHOD.) (6) The cassette holder lowers and, when the loading has

completed, the mechanism enters the desired mode.

P/S Converter board assembly

DEMOD board assembly

CN3502

CN3501

CN7192

Jack board assembly

S-Sub board assembly

CN513

CN6102

CN901

CN902

CN7191

SW/Display board assembly

Fig. 1-5-1

2D Digital [HR-S6700MS] or 3D Digital/2M [HR-S7700MS] board assembly

VR1401

D/A LEVEL ADJ

[HR-S7700MS]

Audio erase board assembly

REC safety board assembly

TP4001 CTL.P

TP2253 A.FM

TP7001 (TEST)

TP111 D.FF

TP106 PB.FM

CP4001

CP5302

CP5301

CN7002 [HR-S6700MS]

TPGND

Terminal board assembly

Main board assembly

[HR-S7700MS]

CN3012

CN3011

To Jog [HR-S7700MS]

CN7001

To Shuttle play [HR-S6700MS]

1-5

1.6 EMERGENCY DISPLAY FUNCTION

This unit has a function for storing the history of the past two emergencies (EMG) and displaying them on each FDP. With the status of the VCR and mechanism at the moment an emergency occurred can also be confirmed.

1.6.1 Displaying the emergency information

(1) Transmit the code “59” from the Jig RCU.

The FDP shows the emergency content in the form of “E:

:**”.

Example 1 E : 01 :

FDP display switching

FDP display

Notes:

• The emergency detail display on the latest emergency. It becomes “ – – : – – : – –” when there is no latest emergency record.

• When using the Jig RCU, set its custom code to match the custom code of the VCR.

Jig RCU

[Data transmitting method] Depress the “ ” ( 3 ) button after the data code is set.

0 : 00 : 00

E: **:

1: *2 :

5: *6 :

CUSTOM CODE 43: A CODE 53: B CODE

DATA CODE

Fig. 1-6-1 Jig RCU [PTU94023B]

Normal display

Emergency content display

(E:Latest:Previous)

Emergency detail display

show the information

1 2

INITIAL MODE

Previous emergency

Latest emergency

––

Example 2 E : –– :

Note:

• For the emergency content, see “1.6.3 Emergency content description”.

(2) Transmit the code “59” from the Jig RCU again.

The FDP shows the emergency detail information 1 in the form of “

* *

3 – : Mechanism sensor information at the moment of

– 4 : Mechanism mode position at the moment of emer-

Note:

• For the emergency detail information 1 , see “1.6.4 Emergency detail information

(3) Transmit the code “59” from the Jig RCU once again.

The FDP shows the emergency detail information form of “

* *

Note:

• For the emergency detail information

gency detail information

1 : *2 : 34”.

1 : Deck operation mode at the moment of emergency 2 : Mechanism operation mode at the moment of emer-

gency

emergency

gency

5 : *6 :

5 : Type of the cassette tape in use

7 ”.

6 : Winding position of the cassette tape in use

7 : Type of the cassette tape in use

No emergency record

”.

in the

(Winding area)

, see “1.6.5 Emer-

(4) Transmit the code “59” from the Jig RCU once again to re-

set the display.

1.6.2 Clearing the emergency history

(1) Display the emergency history. (2) Transmit the code “36” from the Jig RCU. (3) Reset the emergency display.

(Y292-03e)

1-6

1.6.3 Emergency content description

Note:

Emergency contents “E08/E09” are for the model with Dynamic Drum (DD).

FDP CONTENT CAUSE

E01: Loading EMG

E02:

Unloading EMG

E03: Take Up Reel

Pulse EMG

E04: Drum FG

EMG

E05: Cassette Eject

EMG

E06: Capstan FG

EMG

E07: SW Power

Short-Circuit EMG

E08:

DD Initialized (Absolute Position Sensor) EMG

E09: DD FG EMG

E0A:Supply Reel

Pulse EMG

EC1 or EU1: Head clog warning

When the mechanism mode cannot be changed to another mode even when the loading motor has rotated for more than 4 seconds in the loading direction, [E:01] is identified and the power is turned off.

When the mechanism mode cannot be changed to another mode even when the loading motor has rotated for more than 4 seconds in the unloading direction, [E:02] is identified and the power is turned off.

When the take-up reel pulse has not been generated for more than 4 seconds in the capstan rotating mode, [E:03] is identified, the pinch rollers are turned off and stopped, and the power is turned off. However, the reel EMG is not detected in STILL/SLOW modes.

When the drum FG pulse has not been input for more than 3 seconds in the drum rotating mode, [E:04] is identified, the pinch rollers are turned off and stopped, and the power is turned off.

When the eject operation does not complete in 3 seconds after the start, [E:05] is identified, the pinch rollers are turned off and stopped, and the power is turned off. When the cassette insertion operation does not complete in 3 seconds after the start, the cassette is ejected. In addition, when the operation does not complete within 3 seconds after the start, [E:05] is also identified and the power is turned off immediately.

When the capstan FG pulse has not been generated for more than 1 second in the capstan rotating mode, [E:06] is identified, the pinch rollers are turned off and stopped, and the power is turned off.However, the capstan EMG is not detected in STILL/SLOW/FF/REW modes.

When short-circuiting of the SW power supply with GND has lasted for 0.5 second or more, [E:07] is identified, all the motors are stopped and the power is turned off.

When DD tilting does not complete in 4 seconds, [E:08] is identified, the tilt motor is stopped and the power is turned off.

When the DD FG pulse is not generated within 2.5 seconds, [E:09] is identified, the tilt motor is stopped and the power is turned off.

When the supply reel pulse has not been generated for more than 10 seconds in the capstan rotating mode, [E:0A] is identified and the cassette is ejected (but the power is not turned off). However, note that the reel EMG is not detected in the SLOW/STILL mode.

Presupposing the presence of the control pulse output in the PLAY mode, when the value obtained by mixing the two V.FM output channels (without regard to the A.FM output) has remained below a certain threshold level for more than 10 seconds, [E:C1] or [E:U1] is identified and recorded in the emergency history. During the period in which a head clog is detected, the FDP and OSD repeat the “3-second warning display” and “7-second noise picture display” alternately.

EMG code : “E:C1” or “E:U1” / FDP : “U:01” / OSD : “Try cleaning tape.” or “Use cleaning cassette.” The head clog warning is reset when the above-mentioned threshold has been exceeded for more than 2 seconds or the mode is changed to another mode than PLAY.

The mechanism is locked in the middle of mode transition.

The mechanism is locked at the loading end due to the encoder position reading error during mode transition.

Power is not supplied to the loading MDA.

The mechanism is locked in the middle of mode transition.

The mechanism is locked at the unloading end due to the encoder position reading error during mode transition.

Power is not supplied to the loading MDA.

The take-up reel pulse is not generated in the FWD transport modes (PLAY/ FWD SEARCH/FF, etc.) because;

1) The idler gear is not meshed with the take-up reel gear;

The idler gear is meshed with the take-up reel gear, but incapable of winding due to too large mechanical load (abnormal tension);

3) The take-up reel sensor does not output the FG pulse.

The supply reel pulse is not generated in the REV transport modes (REV SEARCH/REW, etc.) because;

1) The idler gear is not meshed with the supply reel gear.

2) The idler gear is meshed with the supply reel gear, but incapable of winding due to too large a mechanical load (abnormal tension);

3) The supply reel sensor does not output the FG pulse.

Power is not supplied to the reel sensors.

The drum could not start or the drum rotation has stopped due to too large a load on the tape, because;

1) The tape tension is abnormally high;

The tape is damaged or a foreign object (grease, etc.) adheres to the tape.

The drum FG pulse did not reach the System controller CPU because;

1) The signal circuit is disconnected in the middle;

2) The FG pulse generator (hall device) of the drum is faulty.

The drum control voltage (DRUM CTL V) is not supplied to the MDA.

Power is not supplied to the drum MDA.

The cassette cannot be ejected due to a failure in the drive mechanism of the housing.

When the housing load increases during ejection, the loading motor is stopped because of lack of headroom in its drive torque.

Housing load increasing factors: Temperature environment (low temperature, etc.), mechanism wear or failure.

The sensor/switch for detecting the end of ejection are not functioning normally.

The loading motor drive voltage is lower than specified or power is not supplied to the motor (MDA).

When the user attempted to eject a cassette, a foreign object (or perhaps the user's hand) was caught in the opening of the housing.

The capstan could not start or the capstan rotation has stopped due to too large a load on the tape, because;

1) The tape tension is abnormally high (mechanical lock);

2) The tape is damaged or a foreign object (grease, etc.) is adhered to the

tape (occurrence of tape entangling, etc.).

The capstan FG pulse did not reach the System controller CPU because;

1) The signal circuit is disconnected in the middle;

2) The FG pulse generator (MR device) of the capstans is faulty.

The capstan control voltage (CAPSTAN CTL V) is not supplied to the MDA.

Power is not supplied to the capstan MDA.

The SW 5 V power supply circuit is shorted with GND.

The SW 12 V power supply circuit is shorted with GND.

1 The absolute value sensor is defective. (The soldered parts have separated.) 2 The pull-up resistor at the absolute sensor output is defective. (The soldered parts

have separated.)

3 Contact failure or soldering failure of the pins of the connector (board-to-board) to the

absolute value sensor.

The absolute value sensor data is not sent to the System Controller CPU.

1 The FG sensor is defective. (The soldered parts have separated.) 2 The pull-up resistor at the FG sensor output is defective. (The soldered parts have

separated.)

3 Contact failure or soldering failure of the pins of the connector (board-to-board) to the FG sensor. 4 The power to the sensor is not supplied. (Connection failure/soldering failure) 5 The FG pulse is not sent to the System Controller CPU. 6

The tilt motor is defective. (The soldered parts have separated.)

7 The drive power to the tilt motor is not supplied. (Connection failure/soldering failure) 8 The tilt motor drive MDA - IC is defective. 9 Auto-recovery of the DD tilting cannot take place due to overrun.

The supply reel pulse is not generated in the FWD transport mode (PLAY/ FWD SEARCH/FF, etc.) because;

1) PLAY/FWD or SEARCH/FF is started while the tape in the inserted cas-

sette is cut in the middle;

2) A mechanical factor caused tape slack inside and outside the supply

reel side of the cassette shell. In this case, the supply reel will not rotate until the tape slack is removed by the FWD transport, so the pulse is not generated until then;

3) The FG pulse output from the supply reel sensor is absent.

The take-up reel pulse is not generated in the REV transport mode (REV SEARCH/REW, etc.).

1) REV SEARCH/REW is started when the tape in the inserted cassette

has been cut in the middle;

2) A mechanical factor caused tape slack inside and outside the take-up

reel side of the cassette shell. In this case, the supply reel will not rotate until the tape slack is removed by the REV transport, so the pulse will not be generated until that time;

3) The FG pulse output from the take-up reel sensor is absent.

The power to a reel sensor is not supplied.

Table 1-6-1

1-7

1.6.4 Emergency detail information

The status (electrical operation mode) of the VCR and the status (mechanism operation mode/sensor information) of the mechanism in the latest emergency can be confirmed based on the figure in EMG detail information

[FDP display]

1 : *2 : 34

1 : Deck operation mode at the moment of emergency

2 :

Mechanism operation mode at the moment of emergency

3 – :

Mechanism sensor information at the moment of emergency

– 4 :

Mechanism mode position at the moment of emergency

Note:

• In the Deck operation mode/Mechanism operation mode/ Mechanism mode position, the contents of the code that is shown on the FDP differs depending on the parts number of the System Control microprocessor (IC3001) of the VCR. For the microprocessor parts number that starts with the two letters “MN”, refer to the Table of MN and for parts number with “HD”, refer to the Table of HD.

2 : Mechanism Operation Mode

[Table of MN]

Display

00 Command standby (Status without executing command) 02 POWER OFF by EMG occurrence 04 Moving to the adjacent position in the LOAD direction 06 Moving to the adjacent position in the UNLOAD direction 08 Cassette ejection being executed 0A Cassette insertion being executed 0C Tape being loaded 0E Tape being unloaded 10 Mode transition to STOP with pinch roller compression ON 12 Mode transition to STOP with pinch roller compression OFF 14 Mode transition to STOP with pinch roller compression OFF as a result

of POWER OFF

16 Mode transition to STOP with pinch roller compression ON as a result of

POWER ON 18 Mode transition to PLAY 1A Mode transition to FWD SEARCH 1C Mode transition to REC 1E Mode transition to FWD STILL/SLOW 20 Mode transition to REV STILL/SLOW 22 Mode transition to REV SEARCH 24 Mode transition from FF/REW to STOP 26 Mode transition to FF 28 Mode transition to REW 2A 4 sec. of REV as a result of END sensor going ON during loading 2C Short FF/REV as a result of tape sensor going ON during unloading 2E Mechanism position being corrected due to overrun 80 Mechanism in initial position (Dummy command)

Mechanism Operation Mode

1 : Deck Operation Mode

[Table of MN]

Display

00 Mechanism being initialized 01 STOP with pinch roller pressure off (or tape present with P.OFF) 02 STOP with pinch roller pressure on 03 POWER OFF as a result of EMG 04 PLAY 0C REC 10 Cassette ejected 20 FF 21 Tape fully loaded, START sensor ON, short FF 22

Cassette identification FWD SEARCH before transition to FF (SP x7-speed) 24 FWD SEARCH (variable speed) including x2-speed 2C INSERT REC 40 REW 42

Cassette identification REV SEARCH before transition to REW (SP x7-speed) 44 REV SEARCH (variable speed) 4C AUDIO DUB 6C INSERT REC (VIDEO + AUDIO) 84 FWD STILL/SLOW 85 REV STILL/SLOW 8C REC PAUSE 8D Back spacing 8E Forward spacing (FWD transport mode with BEST function) AC INSERT REC PAUSE AD INSERT REC Back spacing CC AUDIO DUB PAUSE CD AUDIO DUB Back spacing EC INSERT REC (VIDEO + AUDIO) PAUSE ED INSERT REC (VIDEO + AUDIO) Back spacing

Deck Operation Mode

[Table of HD]

Display

00 STOP with pinch roller pressure off (or tape present with P.OFF) 01 STOP with pinch roller pressure on 04 PLAY 0E REC 11 Cassette ejected 22 FF 26 FWD SEARCH (variable speed) including x2-speed 2E INSERT REC 43 REW 47 REV SEARCH (variable speed) 4C AUDIO DUB 6E INSERT REC (VIDEO+AUDIO) 84 FWD STILL/SLOW 85 REV STILL/SLOW 8F REC PAUSE AF INSERT REC PAUSE CD AUDIO DUB PAUSE EF INSERT REC (VIDEO+AUDIO) PAUSE

Deck Operation Mode

[Table of HD]

Display

00 STOP with pinch roller pressure off 01 STOP with pinch roller pressure on 02 U/L STOP (or tape being loaded) 04 PLAY 05 PLAY (x1-speed playback using JOG) 0E REC 11 Cassette ejected 22 FF 26 FWD SEARCH (variable speed) including x2-speed 2E INSERT REC 43 REW 47 REV SEARCH 4C AUDIO DUB 6E INSERT REC (VIDEO + AUDIO) 84 FWD STILL/SLOW 85 REV STILL/SLOW 8F REC PAUSE AF INSERT REC PAUSE C7 REV SEARCH (x1-speed reverse playback using JOG) CD AUDIO DUB PAUSE EF INSERT REC (VIDEO + AUDIO) PAUSE F0 Mechanism being initialized F1 POWER OFF as a result of EMG F2 Cassette being inserted F3 Cassette being ejected F4 Transition from STOP with pinch roller pressure on to STOP with pinch

roller pressure off F5 Transition from STOP with pinch roller pressure on to PLAY F6 Transition from STOP with pinch roller pressure on to REC F7 Cassette type detection SEARCH before FF/REW is being executed F8 Tape being unloaded F9 Transition from STOP with pinch roller pressure off to STOP with pinch

roller pressure on FA Transition from STOP with pinch roller pressure off to FF/REW FB Transition from STOP with pinch roller pressure off to REC.P (T.REC,etc.) FC Transition from STOP with pinch roller pressure off to cassette type de-

tection SEARCH FD Short REV being executed after END sensor on during unloading FE Tension loosening being executed after tape loading (STOP with pinch

roller pressure on)

Mechanism Operation Mode

1-8

+ 28 hidden pages

JVC HR-S6700MS, HR-S7700MS Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

TABLE OF CONTENTS

Important Safety Precautions

DISASSEMBLY

HOW TO READ THE DISASSEMBLY AND ASSEMBLY

1.3 DISASSEMBLY/ASSEMBLY METHOD1.1 DISASSEMBLY FLOW CHART

1.4 SERVICE POSITION

1.5 MECHANISM SERVICE MODE

1.6 EMERGENCY DISPLAY FUNCTION