JVC HR-S6700MS, HR-S7700MS Service Manual

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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

3 – : Mechanism Sensor Information

[Common table of MN and HD]

Display

0– VHS Tab broken ON ON 1– VHS Tab broken ON OFF 2– VHS Tab broken OFF ON 3– VHS Tab broken OFF OFF 4– VHS Tab present ON ON 5– VHS Tab present ON OFF 6– VHS Tab present OFF ON 7– VHS Tab present OFF OFF 8– S-VHS Tab broken ON ON

9– S-VHS Tab broken ON OFF A– S-VHS Tab broken OFF ON B– S-VHS Tab broken OFF OFF C– S-VHS Tab present ON ON D– S-VHS Tab present ON OFF E– S-VHS Tab present OFF ON F– S-VHS Tab present OFF OFF

– 4 : Mechanism Mode Position

Mechanism Sensor Information

S-VHS SW

REC SAFETY SW

START SENSOR

END SENSOR

[Table of MN]

Display

-0 Initial value

-1 EJECT position

-2 Housing operating

-3 U/L STOP position

-4

Tape being loaded/unloaded (When the pole base is located on the front side of the position just beside the drum)

-5 Tape being loaded/unloaded (When the pole base is located on the rear side of the position just beside the drum)

-6 Pole base compressed position

-7 FF/REW position

-8 Between FF/REW and STOP with pinch roller compression ON

-9 STOP with pinch roller compression OFF

-A Between STOP with pinch roller compression OFF and REV

-B REV (REV STILL/SLOW) position

-C Between REV and FWD

-D FWD (FWD STILL/SLOW) position

-E Between FWD and PLAY

-F PLAY position

Mechanism Mode Position

[Table of HD]

Display

–0 EJECT position –1 U/L STOP position –2 Tape being loaded/unloaded (When the pole base is located on the rear

side of the position just beside the drum)

–3 FF/REW position –4 STOP with pinch roller pressure off –5 REV (REV STILL/SLOW) position –6 FWD (FWD STILL/SLOW) position, PLAY position –7 Intermediate position during transition between other mechanism modes

Mechanism Mode Position

Note:

• As the display is always “–7” at any intermediate position between mechanism modes, the position of transitory EMG may sometimes not be locatable.

1.6.5 Emergency detail information

The type of the cassette tape and the cassette tape winding position can be confirmed based on the figure in EMG detail infor-

mation

[FDP display]

5 : *6 :

* *

Note:

5 : Type of the cassette tape in use

6 : Winding position of the cassette tape in use

7 :

Type of the cassette tape in use

(Winding area)

• EMG detail information 2 is the reference information stored using the remaining tape detection function of the cassette tape. As a result, it may not identify cassette correctly when a special cassette tape is used or when the tape has variable thickness.

5 : Cassette tape type

Display Cassette Tape Type

00 Cassette type not identified 16

Large reel/small reel (T-0 to T-15/T-130 to T-210) not classified 82 Small reel, thick tape (T-120) identified/thin tape (T-140) identified 84 Large reel (T-0 to T-60) identified 92

Small reel, thick tape (T-130) identified/thin tape (T-160 to T-210) identified 93

Small reel, thick tape/C cassette (T-0 to T-100/C cassette) not classified C3

Small reel, thick tape/C cassette (T-0 to T-100/C cassette) being classified D3

Small reel, thick tape/C cassette (T-0 to T-100/C cassette) being classified E1 C cassette, thick tape (TC-10 to TC-20) identified E2 Small reel, thick tape (T-0 to T-100) identified E9 C cassette, thin tape (TC-30 to TC-40) identified

C cassette, thick tape/thin tape (TC-10 to TC-40) not classified

Notes:

•

Cassette tape type

is identified a few times during mode tran-

sition and the identification count is variable depending on the cassette tape type. If an EMG occurs in the middle of identification, the cassette tape type may not be able to be identified.

•

If other value than those listed in the above table is displayed, the cassette tape type is not identified.

6 : Cassette tape winding position

The cassette tape winding position at the moment of EMG is displayed by dividing the entire tape (from the beginning to the end) in 22 sections using a hex number from “00” to “15”.

“00” : End of winding “15” : Beginning of winding “FF” : Tape position not identified

7 : Cassette tape type

Display Cassette Tape Type

Cassette type not identified

Small reel, thick tape T-5

08 - 0E

C cassette, thick tape TC-10

09 - 15

0A - 0B

0D - 0F

19 - 1D 1D - 21 1E - 1F

2D - 2F

C cassette, thick tape TC-20P Small reel, thick tape T-20

0A - 16

C cassette, thin tape TC-30

0A - 16

C cassette, thin tape TC-40 Small reel, thick tape T-40

11 - 14

Small reel, thick tape T-60

15 - 18

Small reel, thick tape T-80/DF-160

17 - 1A

Small reel, thick tape T-80/DF-180 Small reel, thick tape T-100 Small reel, thick tape T-120/DF-240 Small reel, thin tape T-140

1F - 23

Small reel, thick tape T-130

21 - 23

Small reel, thin tape T-160

21 - 23

Small reel, thin tape T-168

22 - 24

Small reel, thick tape DF-300

22 - 24

Small reel, thin tape T-180/DF-380

22 - 24

Small reel, thin tape T-210/DF-420

22 - 23

Large reel T-5

23 - 24

Large reel T-10

25 - 26

Large reel T-20

27 - 29

Large reel T-30

29 - 2B

Large reel T-40 Large reel T-60

(Winding area)

Note:

• The values of cassette tape type 2 in the above table are typical values with representative cassette tapes.

1-9

1.7 SYSCON CIRCUIT

1.7.1 Syscon CPU pin function (IC3001) 1/2

PIN NO. LABEL IN/OUT FUNCTION

1 CTL(+) IN/OUT CTL(+) SIGNAL 2 SVSS - GND 3 CTL(-) IN/OUT CTL(-) SIGNAL 4 CTLBIAS - CTL BIAS VOLTAGE 5 CTLFB IN CTL PULSE FEEDBACK 6 CTLAMPOUT OUT CTL PULSE OUTPUT 7 CTLSMTIN IN CTL PULSE INPUT 8 CFG IN CAPSTAN FG PULSE INPUT

9 SVCC - SYSTEM POWER 10 AVCC - SYSTEM POWER FOR ANALOG CIRCUIT 11 NORM/MESEC/S IN SVHS MODE:H 12

SECAM_DET(H)/KILLER_DET 13 VIDEO_ENV IN 14 START_SENSOR IN START SENSOR 15 END_SENSOR IN END SENSOR 16 IND(L) IN AUDIO INPUT (LCH) FOR THE FDP AUDIO INDICATOR 17 DD_ABS - NC 18 SCR_ID IN SCRAMBLE CONTROL INPUT (SCRAMBLE:H) 19 IND(R) IN AUDIO INPUT (RCH) FOR THE FDP AUDIO INDICATOR 20 BS_ANT/AFC IN TUNING CLOCK 21 LED/RF AGC IN

22 A.ENV/ND(L) IN AUDIO PB FM ENV.INPUT/NON HiFi MODE:L 23 AVSS - GND FOR ANALOG CIRCUIT 24 CTL_GAIN OUT CONTROL AMP OUT FREQUENCY RESPONSE SWITCHING 25 LSA IN MECHANISM MODE DETECT(A) 26 LSB IN MECHANISM MODE DETECT(B) 27 LSC IN MECHANISM MODE DETECT(C) 28 CAP_REV(L) OUT CAPSTAN MOTOR REVERSE CONTROL (FWD:H/REV:L) 29 RC IN REMOTE CONTROL DATA INPUT 30 LOCK(L)/P.SAVE[0.1] IN TUNING PLL LOCK DETECT:L / NC 31 P50_IN IN CONTROL SIGNAL FOR TV LINK 32 R.PAUSE/COMPU_IN IN REMOTE PAUSE CONTROL [HR-S7700MS] / NC 33 RAE_OUT/COMPUOUT - NC 34 P50_OUT OUT CONTROL SIGNAL FOR TV LINK 35 LMC1 OUT LOADING MOTOR DRIVE(1) 36 LMC2 OUT LOADING MOTOR DRIVE(2) 37 LMC3 OUT LOADING MOTOR DRIVE(3) 38 SB_G(PWM) OUT VOLTAGE CONTROL SIGNAL FOR VIDEO FREQUENCY RESPONSE 39 STB/TEST OUT STROBE SIGNAL (FOR FDP DRIVER) 40 POWER_DET IN DETECTION SIGNAL FOR POWER DOWN OF AC POWER SUPPLY 41 REC_SAFETY IN REC SAFETY SWITCH DETECT (SW ON:L) 42 PROTECT IN DETECTION SIGNAL FOR SW POWER SUPPLY 43 VSS - GND 44 RMO OUT REMOTE CONTROL OUTPUT FOR SATELLITE RECEIVER 45 VCC - SYSTEM POWER 46 EXP2_DATA IN/OUT SERIAL DATA TRANSFER OUTPUT FOR TUNER/REG CONTROL 47 EXP1_DATA IN/OUT SERIAL DATA TRANSFER OUTPUT FOR AUDIO/VIDEO CONTROL 48 EXP_CLK OUT 49 I2C_DATA_A/V IN/OUT SERIAL DATA TRANSFER OUTPUT FOR THE VIDEO/AUDIO IC 50 I2C_CLK_A/V OUT SERIAL DATA TRANSFER CLOCK FOR THE VIDEO/AUDIO IC 51 S.DATA_TOSYS IN 52 S.DATA_FRSYS OUT 53 S.CLK OUT 54 SP_FG IN DETECTION SIGNAL FOR SUPPLY REEL ROTATION/TAPE REMAIN 55 TU_FG IN DETECTION SIGNAL FOR TAKE-UP REEL ROTATION/TAPE REMAIN 56 SECAM(H)/EDS(H) OUT COLOUR SYSTEM SECAM:H / NC

IN DETECTION SIGNAL FOR SECAM ON PB MODE (SECAM:H) / NC

AUTO TRACKING DETECT/INPUT THE AVERAGE OF PLAYBACK VIDEO SIGNAL

NC/CHANGES IN ATS+IC OUTPUT AS CAUSED BY CHANGES IN RECEIVER SENSITIVITY

THE SAME CHANNEL IS RECEIVED MORE THAN ONCE ARE INPUT.

WHEN

SERIAL DATA TRANSFER CLOCK FOR AUDIO/VIDEO AND TUNER/REG CONTROL

SERIAL DATA TRANSFER OUTPUT FROM THE ON-SCREEN IC TO THE FDP DRIVER SERIAL DATA TRANSFER OUTPUT FROM THE FDP DRIVER TO THE ON-SCREEN IC SERIAL DATA TRANSMISSION CLOCK FROM THE FDP DRIVER TO THE ON-SCREEN IC

Table 1-7-1 SYSCON CPU pin function(1/2)

1-10

1.7.2 Syscon CPU pin function (IC3001) 2/2

PIN NO. LABEL IN/OUT FUNCTION

57 TU_CE OUT CHIP ENABLE OF THE TUNER UNIT 58 N.REC_ST(H) OUT NORMAL AUDIO SOUND RECORDING START 59 DD_FG - NC 60 TU_CLK OUT CLOCK FOR DATA TRANSFER TO THE TUNER UNIT 61 TU_DATA OUT TUNING DATA 62 FWE - NC 63 NMI(L) - NC 64 X2 - TIMER CLOCK (32.768KHz) 65 X1 - TIMER CLOCK (32.768KHz) 66 RES(L) - RESET TERMINAL (RESET ON:L) 67 OSC1(IN) - MAIN SYSTEM CLOCK(10MHz) 68 VSS - GND 69 OSC2(OUT) - MAIN SYSTEM CLOCK(10MHz) 70 VCC - SYSTEM POWER 71 MODE - NC 72 TU_A_MUTE(H) OUT TUNER AUDIO MUTE CONTROL (MUTE:H) 73 TU_V_MUTE(H) OUT TUNER VIDEO CONTROL (MUTE:H) 74 A.MUTE(H) OUT AUDIO MUTE CONTROL (MUTE:H) 75 I2C_CLK2 OUT SERIAL DATA TRANSFER CLOCK FOR MEMORY IC 76 I2C_DATA2 IN/OUT SERIAL DATA TRANSFER OUTPUT FOR MEMORY IC 77 DDCFWD - NC 78 DDCREV - NC 79 DDSPDCTL - NC 80 V.P.CTL OUT 81 R-Y_REV/EDS_CS - NC 82 VCC - SYSTEM POWER 83 SLOW_P OUT MEMORY TIMING CONTROL IN THE SLOW MODE [HR-S7700MS] 84 VSS - GND 85 SP_SHORT(H) OUT MODE SELECT [HR-S6700MS] 86 LP_SHORT(H) OUT MODE SELECT [HR-S6700MS] 87 FLY_ON(H) OUT FLYING ERASE ON:H [HR-S7700MS] 88 H.REC_ST(H) OUT HIFI AUDIO SOUND RECORDING START 89 TRICK(H)/M_TRICK(L) - NC 90 HEAD_SEL IN HEAD SELECT(LP HEAD:H, SP HEAD:L) 91 OSD_CS OUT CHIP SELECT FOR THE ON-SCREEN IC 92 SYNC_DET(H) IN DETECTION OF VIDEO SYNC SIGNAL (DETECTED:H) 93 MESECAM(H) OUT MESECAM:H 94 JSB/STLB IN INPUT FOR THE JOG SHUTTLE [HR-S7700MS] 95 SHTL(L)/JOGA IN INPUT FOR THE JOG SHUTTLE [HR-S7700MS] 96 JOGB/S_CASS(H) IN NC/DETECTION SIGNAL FOR SVHS CASSETTE (SVHS:H) 97 JSA/STLA IN INPUT FOR THE JOG SHUTTLE [HR-S7700MS] 98 C.SYNC IN COMPOSITE SYNC

99 A.FF OUT AUDIO FF OUTPUT 100 V.FF OUT 101 CAPPWM OUT CAPSTAN MOTOR CONTROL 102 DRUMPWM OUT DRUM MOTOR CONTROL 103 SUB_RESET - NC 104 HI_FF/REW(L) OUT HIGH SPEED FF/REW:L 105 SUB_BUSY - NC 106 SUB_CS - NC 107 DPG IN DRUM PICKUP PULSE INPUT (SWITCHING PULSE) 108 DFG IN DRUM FG PULSE INPUT 109 VCC - SYSTEM POWER 110 V.PULSE OUT V.PULSE ADDITION TIMING CONTROL 111 VSS - GND 112 CTLREF - CTL REFERENCE VOLTAGE

V.PULSE CONTROL, V COMPENSATION DURING SPECIAL PLAYBACK [HR-S7700MS]

ROTATION DETECTION SIGNAL FOR DRUM MOTOR/TIMING CONTROL SIGNAL FOR REC

Table 1-7-2 SYSCON CPU pin function(2/2)

1-11

SECTION 2

MECHANISM ADJUSTMENT

2.1 BEFORE STARTING REPAIR AND ADJUSTMENT

2.1.1 Precautions

(1) Unplug the power cable of the main unit before using your

soldering iron.

(2) Take care not to cause any damage to the conductor

wires when plugging and unplugging the connectors.

(3) Do not randomly handle the parts without identifying

where the trouble is.

(4) Exercise enough care not to damage the lugs, etc. dur-

ing the repair work.

(5) When installing the front panel assembly, be sure to hook

the lug on the back side of the cassette door to the door opener of the cassette holder. If this operation is neglected it will not be possible to remove the cassette when ejecting because the housing door cannot be opened.

2.1.2 Checking for Proper Mechanical Operations

Enter the mechanism service mode when you want to operate the mechanism when no cassette is loaded. (See 1.5 MECHANISM SERVICE MODE.)

Loading motor

Pole base assembly

2.1.3 Manually Removing the Cassette Tape

1. In case of electrical failures

If you cannot remove the cassette tape which is loaded because of any electrical failure, manually remove it by taking the following steps.

(1) Unplug the power cable and remove the top cover,

bracket and front panel assembly. (See 1.3 DISASSEMBLY/ASSEMBLY METHOD.)

(2) Unload the cassette by manually turning the loading mo-

tor of the mechanism assembly toward the front. In doing so, hold the tape by the hand to keep the slack away from any grease. (See Fig.2-1-3a.)

(3) Bring the pole base assembly (supply or take-up side) to

a pause when it reaches the position where it is hidden behind the cassette tape.

(4) Move the top guide toward the drum while holding down

the lug A of the bracket retaining the top guide. Likewise hold part B down and remove the top guide. Section C of the top guide is then brought under the cassette lid. Then remove the top guide by pressing the whole cassette tape down. (See Fig.2-1-3b.)

(5) Remove the cassette tape by holding both the slackened

tape and the cassette lid.

(6) Take up the slack of the tape into the cassette. This com-

pletes removal of the cassette tape.

Fig. 2-1-3a

Press

2-1

Fig. 2-1-3b

2. In case of mechanical failure

Roller driver

PTU94002

A/C head positioning tool

PTU94010

Back tension cassette gauge

PUJ48076-2

Jig RCU

PTU94023B

Alignment tape

(SP, stairstep, PAL)

MHPE

Alignment tape

(LP, stairstep, PAL)

MHPE-L

Torque gauge

PUJ48075-2

If you cannot remove the cassette tape which is loaded because of any mechanical failure, manually remove it by taking the following steps.

(1) Unplug the power cable and remove the top cover, front

panel assembly and others so that the mechanism assembly is visible. (See 1.3 DISASSEMBLY/ASSEMBLY METHOD.)

(2) While keeping the tension arm assembly of the mecha-

nism assembly free from tension, pull the tape on the pole base assembly (supply or take-up side) out of the guide roller. (See Fig.2-1-3c.)

(3) Take the spring of the pinch roller arm assembly off the

hook of the press lever assembly, and detach it from the tape. (See Fig.2-1-3d.)

(4) In the same way as in the electrical failure instructions in

2.1.3-1(4), remove the top guide.

(5) Raise the cassette tape cover. By keeping it in that posi-

tion, draw out the cassette tape case from the cassette holder and take out the tape.

(6) By hanging the pinch roller arm assembly spring back

on the hook, take up the slack of the tape into the cassette.

Pole base assembly (take-up side)

2.1.4 Jigs and Tools Required for Adjustment

Pole base assembly

(supply side)

Tension arm assembly

Fig. 2-1-3c

Take the spring off the hook, and detach it from the tape.

Guide pole guard

Pinch roller arm assembly

Press lever assembly

Fig. 2-1-3d

2-2

2.1.5 Maintenance and Inspection

1. Location of major mechanical parts

In this chapter, the two mechanism speeds are described by comparing the speeds of the standard type and the high-speed FF/REW type. It is possible to distinguish between these two types of mechanism by the diameters of their capstan pulleys. The capstan pulley diameter for the standard type is approx. 32 mm. The capstan pulley diameter for the high-speed FF/REW type is approx. 43 mm. For information on the different parts used in the two mechanism types, please refer to the “Replacement of major parts”.

UV catcher2 (supply and take-up side)

Stator assembly

Full erase head

T26

Pole base assembly

T25

(supply side)

Tension arm

T24

assembly

T23

Tension brake

T22

assembly

Adjust pin

Drum assembly

T5 T7

Head base

Audio control head

Loading motor

Guide pole guard

Pinch roller arm

assembly

Lid guide

T10

Press lever

T11

assembly

Guide arm

T12

assembly

Reel disk

T13

(take-up side)

Sub brake assembly

T14

(take-up side)

Belt

B22

(loading motor)

B21

Control cam

B20

B19

Cassette gear

B18

Worm gear

Brake lever

Rec safety lever

Reel disk

T20

(supply side)

Main brake assembly (supply side)

Idler lever

T17T19T21

Idler arm assembly

T16T18

Pole base assembly (take-up side)

Fig. 2-1-5a Mechanism assembly top side

Capstan motor

Capstan brake assembly

B3 B5

Belt (capstan)

Loading arm gear (take-up side)

Loading arm gear (supply side)

Main brake assembly

T15

(take-up side)

Plate

(supply side)

Control

bracket1

Control plate

Tension arm

bearing

2-3

Link lever

B17

Rotary encoder guide

B16

Rotary encoder

B15

B14

Direct gear

B13

Change lever assembly

B12

B10

Clutch unit

Take-up head

Fig. 2-1-5b Mechanism assembly bottom side

Take-up lever

B11

Guide rail Roller cam assembly

L2L1

Fig. 2-1-5c Mechanism assembly left side

Opener guide

Door

opener

Drive gear

Cassette housing bracket

Limit gear

Loading motor

Worm gear

Belt (loading motor)

Fig. 2-1-5d Mechanism assembly right side

2. Cleaning

Regular cleaning of the transport system parts is desirable but practically impossible. So make it a rule to carry out cleaning of the tape transport system whenever the machine is serviced. When the video head, tape guide and/or brush get soiled, the playback picture may appear inferior or at worst disappear, resulting in possible tape damage.

(1) When cleaning the upper drum (especially the video

head), soak a piece of closely woven cloth or Kimu-wipe with alcohol and while holding the cloth onto the upper drum by the fingers, turn the upper drum counterclockwise.

Note:

• Absolutely avoid sweeping the upper drum vertically as this will cause damage to the video head.

(2) To clean the parts of the tape transport system other than

the upper drum, use a piece of closely woven cloth or a cotton swab soaked with alcohol.

(3) After cleaning, make sure that the cleaned parts are com-

pletely dry before using the video tape.

3. Lubrication

With no need for periodical lubrication, you have only to lubricate new parts after replacement. If any oil or grease on contact parts is soiled, wipe it off and newly lubricate the parts.

Note:

• See the “mechanism assembly” diagram of the parts list for the lubricating or greasing spots, and for the types of oil or grease to be used.

4. Suggested servicing schedule for main components

The following table indicates the suggested period for such service measures as cleaning,lubrication and replacement. In practice, the indicated periods will vary widely according to environmental and usage conditions.However, the indicated components should be inspected when a set is brought for service and the maintenance work performed if necessary. Also note that rubber parts may deform in time,even if the set is not used.

System Parts Name

Upper drum assembly

A/C head

Lower drum assembly

Pinch roller arm assembly

Full erase head

Tension arm assembly

Tape transport

Capstan motor (Shaft)

Guide arm assembly

Capstan motor

Capstan brake assembly

Main brake assembly

Belt (Capstan)

Belt (Loading motor)

Loading motor

Clutch unit

Worm gear

Control plate

Brush

Tension brake assembly

Other Drive

Rotary encoder

: Cleaning

: Inspection or Replacement if necessary

Operation Hours

~1000H ~2000H

¤R R ¤R ¤R

¤¤R ¤¤ ¤¤ ¤¤ ¤¤ ¤¤

R R R

R R R R R

¤R ¤R

Table 2-1-5a

5. Disassembling procedure table

The following table indicates the order in which parts are removed for replacement. To replace parts, remove them in the order of 1 to 18 as shown in the table. To install them, reverse the removal sequence. The symbols and numbers preceding the individual part names represent the numbers in the “Location of major mechanical parts” table. Also, the “T”, “B”, and “T/B” on the right of each part name shows that the particular part is removed from the front, from the back, and from both sides of the mechanism, respectively.

2-4

R4 R1 R3 T9 T 12 T11 B15 B12 B14 B13 B17 B21 B7 B8 B5 B4 B11 T14 T15 T13 T22 T24 T18 B19

Symbols and numbers

Removal parts

(Reference items) Replacement parts

Symbols and numbers

2.2.3 Guide rail T 1

2.2.3 Roller cam assembly T 1

2.2.3 Cassette housing bracket T 1

2.2.3 Opener guide T 2

2.2.3 Door opener T 3

2.2.3 Relay gear T 3

2.2.3 Limit gear T 3

2.2.3 Cassette holder assembly T 6

2.2.3 Drive gear T 4

2.2.3 Drive arm T 8

2.2.4 Pinch roller arm assembly T 1

T12

2.2.5 Guide arm assembly T 1

T11

2.2.5 Press lever assembly T 3

2.2.6 Audio control head T 1

2.2.7 Loading motor T 1

2.2.8 Capstan motor T/B 1

2.2.9 UV catcher2 T 1

T17

Pole base assembly (take-up side)

2.2.9

T25

2.2.9

Pole base assembly (supply side)

B15

2.2.10 Rotary encoder B 1

B12

2.2.11 Clutch unit B 1

B14

2.2.12 Change lever assembly B 3

B13

2.2.12 Direct gear B 4

2.2.12 Clutch gear B 5

2.2.12 Coupling gear (

B17

2.2.13 Link lever B 1

2.2.14 Cassette gear B 2

B18

B20

2.2.14 Control cam B 2

B21

2.2.14 Worm gear B 1

T10

- Lid guide T/B 5

2.2.15 Control bracket1 B 1

2.2.15 Control plate B 6

2.2.16 Loading arm gear (supply side) B 7

Loading arm gear (take-up side)

2.2.16

2.2.16 Loading arm gear shaft B 9

2.2.17 Take-up lever T/B 7

B11

B10

2.2.17 Take-up head T/B 8

2.2.17 Control plate guide T/B 8

2.2.18 Capstan brake assembly T/B 7

T14

Sub brake assembly(take-up side)

2.2.19

T15

Main brake assembly(take-up side)

2.2.20

T19

2.2.20

Main brake assembly(supply side)

T13

2.2.20 Reel disk (take-up side) T/B 16

T22

2.2.21 Tension brake assembly T/B 9

T20

2.2.21 Reel disk (supply side) T/B 10

T24

2.2.21 Tension arm assembly T/B 10

2.2.21 Tension arm bearing T/B 10

T18

2.2.22 Idler lever T/B 17

T16

2.2.22 Idler arm assembly T/B 18

B19

- Brake lever (

B16

- Rotary encoder guide T/B 19

2) B 6

) T/B 18

L1L1L2

Number of removal steps

Guide rail

Roller cam assembly

Cassette housing bracket

Opener guide

Front (T)/Back (B) of mechanism

1 2 3 4 5

T/B 2

T/B 15

1 2 3 4

T/B 16

1 2 3 4 5 6 7 8

T/B 9

1 2 3 4 5 6 7 8

1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8

1 2 3 4 5 6 7 8

1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8

1 2 3 4 5 6 7 8

Relay gear

112 12

12 3

4 5

5 6

6 7

Cassette holder assembly

Drive gear

Table 2-1-5b

Note:

• The parts with marked ( nisms (standard type or high-speed FF/REW type).

1 : Uses the standard type mechanism only.

2 : Uses the high-speed FF/REW type mechanism only.

) have different types of mecha-

Drive arm

Pinch roller arm assembly

Guide arm assembly

Press lever assembly

UV catcher2

Rotary encoder

Clutch unit

Change lever assembly

Direct gear

Clutch gear

Link lever

Worm gear

Control bracket1

Control plate

Loading arm gear (supply side)

Loading arm gear (take-up side)

1 2 3 4 5

3 4

1 2 3 4

1 2 3 4 5

1 2 3 4 5 6 1 2 3 4 5 6 7 1 2 3 4 5 6

1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 6

9 10 11 12 13 14

9 10 11 12 13 14 15

9 10 11 12 13 14 15 16

9 10 11 12 13 14 15 16 17 9 10 11 12 13 14 15 16 17

9 10 11 12 13 14 15 16 17 18

) 1

(

Take-up lever

Sub brake assembly (take-up side)

Main brake assembly (take-up side)

Reel disk (take-up side)

Tension brake assembly

Tension arm assembly

Idler lever

Brake lever

7 7

2-5

2.2 REPLACEMENT OF MAJOR PARTS

2.2.1 Before Starting Disassembling (Phase matching between mechanical parts)

The mechanism of this unit is closely linked with the rotary encoder and system controller circuits. Since the system controller detects the status of mechanical operation in response to phases of the rotary encoder (internal switch positions), the mechanism may not operate properly unless such parts as the rotary encoder, control plate, loading arm gear, control cam, cassette gear, limit gear, relay gear and drive gear are installed in their correct positions. Especially, this model is not provided with any cassette housing assembly, so that cassette loading and unloading must be accomplished by operation of the cassette holder assembly. The latter is in turn driven by such parts as the drive gear, relay gear and limit gear. Exercise enough care, therefore, to have the phases of all this gear matching one another. (For information on phase matching of the mechanism, see the instructions on how to install individual parts.) This unit is provided with a mechanism assembly mode. It is therefore necessary to enter this mode for assembling and disassembling procedures. This mode is usually not in use, manually set it when it is required.

2.2.3 Cassette Holder Assembly

1. How to remove

(1) Remove the guide rail and roller cam assembly. (See

Fig.2-2-3a.) (3 lugs on the guide rail and one lug on the roller cam assembly)

Guide rail

Lugs

Roller cam assembly

Lug

Fig. 2-2-3a

(2) Remove the two slit washers and remove the cassette

housing bracket. (See Fig.2-2-3b.)

(3) Remove the opener guide, spring(A), door opener, relay

gear and limit gear. (See Fig.2-2-3b.)

2.2.2 How to Set the Mechanism Assembling Mode

Remove the mechanism assembly and place it bottom side up. (See SECTION 1 DISASSEMBLY.) Turn the worm gear toward the front so that the guide hole of the control cam is brought into alignment with the hole at the mechanism assembly chassis. This position renders the mechanism assembling mode operational. Make sure that the control plate is located in alignment with the mark E. (See Fig.2-2-2a.)

Worm gear

Chassis hole

Guide hole

Control cam

Limit gear

Spring(A)

Opener guide

Relay gear

Door opener

Cassette housing bracket

Slit washers

Fig. 2-2-3b

(4) While swinging the lock levers (R) and (L) of the cassette

holder assembly toward the front, slide the cassette holder assembly until its legs come to where the guide rail and the roller cam assembly have been removed (so that the drive arm is upright). (See Fig.2-2-3c.)

Lock lever (L)

Cassette holder assembly

Drive arm

(Upright)

Mark E

Control plate

Fig. 2-2-2a

Fig. 2-2-3c

Legs

2-6

(5) While holding the left side of the cassette holder, lift the

cassette holder assembly so that the three legs on the left side are all released. Then pull the legs

and

on the right side out of the rail and also pull up the leg

. (See Fig.2-2-3d and Fig.2-2-3e.)

(6) Draw out the drive gear, and remove the drive arm.

Cassette holder assembly

Fig. 2-2-3d

Cassette holder assembly

2. How to install (Phase matching)

(1) Insert the section

of the drive arm into the section

of the main deck.

(2) Insert the section

and the section

of the drive gear into the round hole,

into the square hole on the drive arm.

(See Fig.2-2-3f.)

(3) Hold the drive arm upright and fit the leg

on the right

side of the cassette holder assembly into the groove. (See Fig.2-2-3g.)

(4) While swinging the lock lever (R) of the cassette holder

assembly toward the front, put the legs

and ı into

the rail. (See Fig.2-2-3g.)

(5) Drop the three legs on the left side of the cassette holder

assembly into the groove at one time. (See Fig.2-2-3h.)

(6) Slide the whole cassette holder assembly toward the front

to bring it to the eject end position.

(7) Install the limit gear so that the notch on the outer cir-

cumference of the limit gear is brought into alignment with the guide hole on the main deck. (See Fig.2-2-3i.)

(8) Install so that the notch on the periphery of the relay gear

is aligned with the notch of the main deck and that hole A of the relay gear is aligned with the hole A of the limit gear and that hole B of the relay gear is aligned with the hole B of the drive gear. (See Fig.2-2-3i.)

(9) Install the door opener, opener guide, spring(A) and cas-

sette housing bracket and fasten the two slit washers.

Cassette holder assembly

Fig. 2-2-3e

Main deck right side

Drive arm

Hole

Lock lever (R)

Drive arm

Fig. 2-2-3g

Cassette holder assembly

Hole

Drive gear

2-7

Fig. 2-2-3f

Fig. 2-2-3h

Relay gear

Guide holeNotches Notch

2.2.6 Audio Control Head

1. How to remove

(1) Remove the two screws (A) and remove the audio con-

trol head together with the head base.

(2) When replacing only the audio control head, remove the

three screws (B) while controlling the compression spring.

Head base

Drive gear Limit gear

Fig. 2-2-3i

2.2.4 Pinch Roller Arm Assembly

1. How to remove

(1) Remove the spring from the hook of the press lever as-

sembly.

(2) Remove the slit washer and remove the pinch roller seat

2. (See Fig.2-2-4a.)

(3) Remove the pinch roller arm assembly by pulling it up.

Slit washer

Pinch roller seat2

Spring

Pinch roller arm

Press lever assembly

Pinch roller arm assembly

assembly

Fig. 2-2-4a

2.2.5 Guide Arm Assembly and Press Lever Assembly

1. How to remove

(1) Remove the spring and expand the lug of the lid guide in

the arrow-indicated direction. Then remove the guide arm assembly by pulling it up.

(2) Remove the press lever assembly by pulling it up. (See

Fig.2-2-5a.)

Screws(A)

Audio control head

Fig. 2-2-6a

Screws(B)

Audio control head

Compression

Audio control head board assembly

Head base

springs

Fig. 2-2-6b

2. How to install

(1) To make the post-installation adjustment easier, set the

temporary level as indicated in Fig.2-2-6c. Also make sure that the screw center (centre) is brought into alignment with the center (centre) position of the slot.

A/C head

12.4 mm

Head base

Screw

Tension spring

LugLid guide

Fig. 2-2-5a

Press lever assembly

Guide arm assembly

Head base

Audio control head

Fig. 2-2-6c

2.2.7 Loading Motor

1. How to remove

(1) Remove the belt wound around the worm gear. (2) Open the two lugs of the motor guide and remove the

loading motor, loading motor board assembly and motor guide altogether by pulling them up.

(3) When replacing the loading motor board assembly, take

care with the orientation of the loading motor. (Install so that the loading motor label faces upward.)

(4) When the motor pulley has been replaced, choose the

fitting dimension as indicated in Fig.2-2-7a.

2-8

Loading motor board assembly

Loading motor

Lugs

Motor guide

6.5 ± 0.2 mm

LABEL

Motor pulley

Worm gear

Belt

Fig. 2-2-7a

2.2.8 Capstan Motor

1. How to remove

(1) Remove the belt (capstan) on the mechanism assembly

back side.

(2) Remove the three screws (A) and remove the capstan

motor.

Screws(A)

Screw(A)

Capstan motor

Belt

Fig. 2-2-8a

Spacer

2. How to install (Centering the mounting position)

When the capstan motor has once been removed and then reinstalled out of the initial correct position in the rotational direction, the capstan motor current may be unstable during operation in high or low temperatures. This may result in greater Wow & Flutter and occasionally in power breakdown because of current over - load. Install the capstan motor while following the procedure given below. (The capstan motor is centrally located when the unit is shipped from the factory.)

(1) Provisionally tighten the three screws (A) securing the

capstan motor.

(2) Install the mechanism assembly to which the capstan

motor is provisionally fastened on the bottom chassis which incorporates the Main board assembly. (No need to tighten the screws for mounting the mechanism.) Make sure that all the connectors for the mechanism assembly and the Main board assembly are correctly installed as indicated in Fig. 2-2-8b.

(3) Making sure that the connector for the capstan motor is

correctly mounted, and securely tighten the three screws (A).

Note:

• When the capstan motor has been replaced with a new one, perform recording in the EP(or LP) mode for at least 2 minutes at normal temperatures immediately before starting the FF/REW or SEARCH operations (Aging).

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

1. How to remove

(1) Remove the UV catcher 2 on the removal side by loos-

ening the screw (A).

(2) Remove the pole base assembly on the supply side from

the mechanism assembly by loosening the screw (B) on the mechanism assembly back side and sliding the pole base assembly toward the UV catcher 2.

(3) As for the pole base assembly on the take-up side, turn

the pulley of the loading motor to lower the cassette holder because the screw (B) is hidden under the control plate. (See the “Procedures for Lowering the Cassette holder assembly” of 1.3 DISASSEMBLY/ASSEMBLY METHOD.) Further turn the motor pulley to move the cassette holder until the screw (B) is no longer under the control plate (in the half-loading position). Then remove it as done for the supply side by removing the screw (B).

Note:

• After reinstalling the Pole base assembly and the UV catcher2, be sure to perform compatibility adjustment.

2-9

Fig. 2-2-8b

Connector for the capstan motor

Screw(A)

UV catcher2

Screw(A)

UV catcher2

Screw(B)

Fig. 2-2-9a

Spacer

Change lever assembly

Direct gear

Clutch gear

Spring (C)

Slit washer

Lugs

Spring(A) Position the projecting side down.

Spring(B)

Washer (*1)

Spacer (

Coupling gear (

2.2.10 Rotary Encoder

1. How to remove

(1) Remove the screw (A) and remove the rotary encoder

by pulling it up. (See Fig. 2-2-10a.)

Rotary encoder (Front side)

Screw(A)

Positioning pin of the rotary encoder

Guide marks

Rotary encoder (Back side)

Fig. 2-2-10a

Mark E

2.2.12 Change Lever Assembly, Direct Gear, Clutch Gear and Coupling Gear

1. How to remove

(1) Release the two lugs of the rotary encoder guide in the

arrow-indicated direction and remove the change lever assembly.

(2) Remove the slit washer retaining the direct gear and re-

move the latter. Take care so as not to lose the washer and spring. (See Fig.2-2-12a.)

Shaft of the rotary encoder guide

Control plate

Fig. 2-2-10b

2. How to install (Phase matching)

(1) Make sure that the mark E of the control plate is in align-

ment with the mark

of the loading arm gear shaft and bring the guide marks on the rotary encoder into alignment as indicated in Fig.2-2-10a. (See Fig. 2-2-10a and Fig. 2-2-10b.)

(2) Turn over the rotary encoder with its guide marks kept in

alignment and install it by fitting on the shaft of the rotary encoder guide and the positioning pin.

(3) Tighten the screw (A) to complete the installation.

2.2.11 Clutch Unit

(1) Remove the belt wound around the capstan motor and

the clutch unit.

(2) Remove the slit washer and remove the clutch unit.

Belt

Clutch unit

Slit washer

Note:

• The parts with marked ( speed FF/REW type). 1 : Uses the standard type mechanism only.

Uses the high-speed FF/REW type mechanism only.

) have different types of mechanisms (standard type or high-

Fig. 2-2-12a

2. How to install

(1) Install the clutch gear, spring (A), spring (C), direct gear,

spacer and others to the individual shafts of the main deck, and finally the slit washer. (See Fig.2-2-12a.)

(2) Let the spring (B) drops into the rotary encoder guide hole

and install the change lever assembly.(Take care not to mistake a direction of the spring.) The point is to slightly lift the clutch gear and catch it from the both sides with the assembly. (See Fig.2-2-12b.)

Rotary encoder guide

Spring(B)

Main deck Main deck

Change lever assembly

Clutch gear

Fig. 2-2-12b

Fig. 2-2-11a

2-10

2.2.13 Link Lever

1. How to remove

(1) Remove the two slit washers. (2) Remove the link lever by lifting it from the shaft retained

by the slit washers. Then swing the link lever counterclockwise and remove it from the locking section of the control plate.

Slit washers

2.2.14 Cassette Gear, Control Cam and Worm Gear

1. How to remove

(1) Remove the control cam by lifting it. (2) Open the two lugs of the cassette gear outward and pull

the latter off.

(3) Remove the belt wound around the worm gear and the

loading motor.

(4) Open the lug of the lid guide outward and remove the

worm gear.

Link lever

Locking section of the control plate

Fig. 2-2-13a

2. How to install (Phase matching)

(1) Slide the control plate so that its mark E is aligned with

the mark

on the loading arm gear shaft. (See Fig.2-2-

13b.)

(2) Rotate the worm gear until the guide hole of the control

cam is aligned exactly with the guide hole of the main deck. (See Fig.2-2-13c.)

(3) Insert the link lever into the locking section of the control

plate. (See Fig.2-2-13a.)

(4) Rotate the link lever clockwise so that it is installed on

the shafts in the center (centre) and on the left of the control cam.

(5) Fasten the slit washers at these two points.

Loading motor

Belt

Lug

Worm gear

Lugs

Cassette gear

Lid guide

Control cam

Fig. 2-2-14a

2.2.15 Control Plate

1. How to remove

(1) Remove the screw (A) retaining the control bracket 1 and

remove the latter.

(2) Slide the control plate as indicated by the arrow and re-

move the control plate. (See Fig.2-2-15a.)

Shaft of the rotary encoder guide

Fig. 2-2-13b

Worm gear

Main deck guide hole

Control cam guide hole

Cassette gear

Fig. 2-2-13c

Control plate

Control cam

Mark E

Screw(A)

Control bracket1

Control plate

Fig. 2-2-15a

2. How to install (Phase matching)

(1) Adjust the position of the idler arm assembly pin as indi-

cated in Fig.2-2-15b (to the left of center (centre) of the R section).

(2) Bring the guide hole of the take-up lever into alignment

with the hole at the control plate guide and fix the position by inserting a 1.5 mm hexagonal wrench.

2-11

(3) Install the control plate so that the section A of the load-

ing arm gear shaft fits into the hole (A) of the control plate, the section B of the control plate guide into the hole (B), and the control plate comes under the section C of the rotary encoder guide and the section D of the loading arm gear shaft while press-fit the pole base assmebly (supply side) as indicated by the arrow. It is important that the tension arm assembly shaft is positioned closer toward you than the control plate. (See Fig.2-2-15c.)

(4) Make sure that the mark E of the control plate is in align-

ment with the mark

of the loading arm gear shaft. (See

Fig.2-2-15c.)

(5) Pull off the hexagonal wrench for positioning.

(3) Turn the loading arm gear (take-up side) clockwise so

that the notch of the loading arm gear (take-up side) is in alignment with the projection of the loading arm gear shaft and lift it. Likewise, turn the loading arm counterclockwise so that the notch is in alignment with the projection and remove the loading arm gear (take-up side). (See Fig.2-2-16a and Fig. 2-2-16b.)

(4) When removing the loading arm gear shaft, be sure of

first removing the screw retaining the drum assembly (on the back side of the loading arm gear shaft). Then remove the screw (C) and remove the loading arm gear shaft by sliding it.

Idler arm assembly pin

R section

Guide hole of the control plate guide

Section D

1.5mm hexagonal wrench

Fig. 2-2-15b

Section A

Section D

Hole A

Pressfit

Take-up lever

Insert

Pole base assembly (supply side)

Section A

Hole A

Pole base assembly (take-up side)

Screw(B)

Torsion arm

Loading arm gear (take-up side)

Projection B

Guide marks

Projection A

Pole base assembly (supply side)

Screw(A)

Loading arm gear (supply side)

Fig. 2-2-16a

Loading arm gear shaft

Loading arm gear (take-up side)

Notch

Screw(C)

Loading arm gear shaft

Section C

Section B

Hole B

Section B

Control plate

Tension arm assembly shaft

Fig. 2-2-15c

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

1. How to remove

(1) Remove the loading arm gear (supply side) by loosen-

ing the screw (A). (See Fig. 2-2-16a.)

(2) Remove the screw (B) and remove the torsion arm from

the pole base assembly (take-up side). (See Fig.2-2-16a.)

Fig. 2-2-16b

2. How to install

(1) Align the notch of the loading arm gear (take-up side) to

the projection B of the loading arm gear shaft and slip it over. Then rotate it clockwise for alignment with the projection A and slip it down to the bottom. (See Fig.2-216b.)

(2) Then turn the loading arm gear (take-up side)

counterclockwise. Hang the torsion arm on the pole base assembly (take-up side) and tighten the screw (B).

(3) Install the loading arm gear (supply side) so that the guide

mark of the loading arm gear (take-up side) is in alignment with the guide mark of the loading arm gear (supply side). Then hang the torsion arm on the pole base assembly (supply side) and tighten the screw (A). (See Fig.2-2-16a.)

2-12

2.2.17 Take-up Lever, Take-up Head and Control Plate Guide

(1) Remove the spring of the take-up lever from the main

deck.

(2) Remove the lug (A) of the take-up lever from the main

deck and pull out the take-up lever and the take-up head

together. (3) Remove the screw (A). (4) Align the idler arm assembly pin in the center (centre) of

the R section of the control plate guide, remove the con-

trol plate guide lugs (B) and (C) from the main deck, and

remove the control plate guide.

Idler arm assembly pin

Lug(C)

Screw(A)

Take-up lever

Take-up head

Lug(A)

Lug(B)

Control plate guide

Fig. 2-2-17a

2.2.18 Capstan Brake Assembly

1. How to remove

(1) Move the lug (A) of the capstan brake assembly in the

arrow-indicated direction so that it comes into alignment

with the notch of the main deck. (See Fig. 2-2-18a.) (2) Remove the lug (B) of the capstan brake assembly from

the main deck and remove the capstan brake assembly.

Spring

Sub brake

Lug(A)

Lug(B)

assembly (take-up side)

Lug(C)

Fig. 2-2-19a

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

1. How to remove

(1) Move the main brake assembly (take-up side) in the ar-

row-indicated direction and remove the reel disk (takeup side). Remove the spring attached to the main brake assembly.

(2) (3) Remove the lug (A) of the main brake assembly (take-

up side) and pull out the lug (B) after bringing it into alignment with the main deck notch.

(4) Remove the lugs (C), (D) and (E) of the main brake as-

sembly (supply side) from the main deck and pull them off. (See Fig.2-2-20a.)

(5) When installing the main brake assembly (take-up side),

slide the brake lever in the direction as indicated by the arrow to prevent it from hitting the projection of the main brake assembly (take-up side). (See Fig.2-2-20b.)

Main brake assembly (supply side)

Reel disk (take-up side)

Main brake assembly (take-up side)

Lug(B)

Lug(A)

Capstan brake assembly

Fig. 2-2-18a

2.2.19 Sub Brake Assembly (take-up side)

1. How to remove

(1) Remove the spring attached to the lid guide and sub

brake assembly (take-up side).

(2) Bring the lug (A) of the sub brake assembly (take-up side)

into alignment with the notch of the main deck.

(3) Remove the lugs (B) and (C) of the sub brake assembly

(take-up side) from the main deck and remove the sub brake assembly (take-up side).

2-13

Lug(B)

Lug(C)

Lug(D)

SpringLug(E)

Lug(A)

Notch

Fig. 2-2-20a

(

Brake lever

Note:

• The parts with marked ( *) have different types of mechanisms (standard type or high-speed FF/REW type). 1 : Uses the standard type mechanism only.

Rotary encoder guide

Projection of the main brake assembly (take-up side)

Fig. 2-2-20b

2.2.21 Tension Brake Assembly, Reel Disk (supply side)

(

)

and Tension Arm Assembly

1. How to remove

(1) Remove the three lugs of the tension brake assembly

from the main deck and pull them off.

(2) Remove the reel disk (supply side) by loosening in the

arrow-indicated direction the main brake assembly (supply side).

(3) Remove the tension spring on the back of the main deck.

Then release the lug of the tension arm bearing in the arrow-indicated direction and draw out the tension arm assembly. (See Fig. 2-2-21a.)

Lug of the tension arm bearing

Tension arm assembly

Reel disk (supply side)

2.2.23 Stator Assembly

(1) Remove the flat cable. (2) Remove the two screws (A). (3) Remove the stator assembly by lifting in the arrow-indi-

cated direction. (Take care that the brush spring does not jump out.)

(4) After installation, be sure to perform the PB switching

point adjustment according to the electrical adjustment procedure.

Screws(A)

Tension brake assembly

Lugs

Tension spring Main brake assembly

supply side

Fig. 2-2-21a

2.2.22 Idler Lever, Idler Arm Assembly

1. How to remove

(1) Remove the lug of the idler lever from the main deck and

remove the hook fitted in the idler arm assembly hole by lifting it.

(2) Remove the slit washer and pull out the idler arm assem-

bly.

Lug Idler lever

Stator assembly

Flat cable (Take care not to mix up the polar faces when installing.)

Fig. 2-2-23a

2.2.24 Rotor Assembly

(1) Remove the stator assembly. (2) Remove the two screws (B) and remove the rotor assem-

bly.

Note:

• When installing the rotor assembly, note that a normal picture cannot be obtained without ensuring the phase matching as mentioned below.

(3) Match the phases of the upper drum assembly and the

rotor assembly as indicated in Fig.2-2-24a.

(4) Place the upper drum assembly hole (a) over the rotor

assembly holes (b) (with three holes to be aligned) and tighten the two screws (B). (See Fig.2-2-24a.)

Hole(a)

The hole is not in line but is offset toward the right.

Hole(b)

Fig. 2-2-22a

Hook

Idler arm assembly

Slit washer

Screws (B)

Screw holes

Upper drum assembly

Rotor assembly

Fig. 2-2-24a

2-14

2.2.25 Upper Drum Assembly

1. How to remove

(1) Remove the stator assembly and rotor assembly. (2) Loosen the screw of the collar assembly using a 1.5 mm

hexagonal wrench and remove the collar assembly. Also remove the brush, spring and cap at one time.

(3) Remove the upper drum assembly and remove the

washer using tweezers.

Note:

• When replacement is required, control the up- down movement of the brush. Never apply grease.

Lower drum assembly

Coil parts

Upper drum assembly

Spring

Brush

Upper drum assembly

Washer

Collar assembly

Loosen

Cap

1.5 mm hexagonal wrench

Shaft

Lower drum assembly

Fig. 2-2-25a

2. How to install

(1) Clean the coil parts of the lower drum assembly and the

newly installed upper drum assembly with an air brush in advance. (See Fig.2-2-25b.)

(2) Install a new washer and upper drum assembly on the

drum shaft. (See Fig.2-2-25a.)

Note:

• When replacing the upper drum assembly, replace it the together with the washer.

(3) Install the cap to the upper drum assembly. (4) Position the collar assembly as indicated in Fig.2-2-25c

while controlling its up- down movement.

(5) Secure the collar assembly in position with a hexagonal

wrench while pressing its top with the fingers.

(6) After installation, gently turn the upper drum assembly

with your hand to make sure that it turns normally. Then install the brush and the spring.

(7) Install the rotor assembly and stator assembly according

to Fig 2-2-23a and 2-2-24a.

(8) When installation is complete, clean the upper drum as-

sembly and lower drum assembly and carry out the following adjustments.

• PB switching point adjustment

• Slow tracking adjustment

• Compatibility adjustment (Be sure to check for compat-

ibility for the EP (or LP) mode.)

Upper drum assembly

Collar assembly

Fig. 2-2-25b

Fig. 2-2-25c

Press

Fig. 2-2-25d

Collar assembly

Tighten

2-15

2.3 COMPATIBILITY ADJUSTMENT

Notes:

• Although compatibility adjustment is very important, it is not necessary to perform this as part of the normal servicing work. It will be required when you have replaced the audio control head, drum assembly or any part of the tape transport system.

• To avoid any damage to the alignment tape while performing the compatibility adjustment, get a separate cassette tape (for recording and play back) ready to be used for checking the initial tape running behavior.

• Unless otherwise specified, all measuring points and adjustment parts are located on the Main board.

• 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.

CUSTOM CODE 43: A CODE 53: B CODE

DATA CODE

INITIAL MODE

Fig. 2-3a Jig RCU [PTU94023B]

(5) Reduce the V.PB FM waveform while pressing the chan-

nel buttons (+, –) during playback. If a drop in level is found on the left side, turn the guide roller of the pole base assembly (supply side) with the roller driver to make the V.PB FM waveform linear. If a drop in level is on the right side, likewise turn the guide roller of the pole base assembly (take-up side) with the roller driver to make it linear. (See Fig. 2-3-1c.)

(6) Make sure that the V.PB FM waveform varies in parallel

and linearly with the tracking operation again. When required, perform fine-adjustment of the guide roller of the pole base assembly (supply or take-up side).

(7) Unload the cassette tape once, play back the alignment

tape (A1) again and confirm the V.PB FM waveform.

(8) After adjustment, confirm that the tape wrinkling does not

occur at the roller upper or lower limits. (See Fig. 2-31d.)

[Perform adjustment step (9) only for the models

equipped with SP mode and EP (or LP) mode.]

(9) Repeat steps (1) to (8) by using the alignment tape (A2).

2.3.1 Checking/Adjustment of FM Waveform Linearity

Signal (A1) •

(A2) • Mode (B) • PB Equipment (C) • Oscilloscope Measuring point (D) • TP106 (PB. FM) External trigger (E) • TP111 (D.FF) Adjustment part (F) • Guide roller [Mechanism assembly] Specified value (G) • Flat V.PB FM waveform Adjustment tool (H) • Roller driver [PTU94002]

Alignment tape(SP, stairstep, PAL) [MHPE] Alignment tape(LP, stairstep, PAL) [MHPE-L]

(1) Play back the alignment tape (A1). (2) Apply the external trigger signal to D.FF (E), to observe

the V.PB FM waveform at the measuring point (D).

(3) Press the channel buttons (+, –) simultaneously to enter

the manual tracking mode. This also brings tracking to the center (centre).

(4) Make sure that there is no significant level drop of the

V.PB FM waveform caused by the tracking operation, with its generally parallel and linear variation ensured. Perform the following adjustments when required. (See Fig. 2-3-1a.)

Max level

Proper waveform variation

Improper waveform variation

Fig. 2-3-1a

Roller driver

Min level

Guide roller (supply side)

Fig. 2-3-1b

2-16

(2)

(3)

(1)

AUDIO OUT

Head base

Audio control head

CTL. P

Level drop at the guide roller (supply side)

Level drop at the guide roller (take-up side)

• Proper waveform variation: Always flat

the manual tracking mode. This also brings tracking to the center (centre).

(4) Adjust the AUDIO OUT waveform and Control pulse

waveform by turning the screws (1), (2) and (3) little by little until both waveforms reach maximum. The screw (1) and (3) are for adjustment of tilt and the screw (2) for azimuth.

(3) Press the channel buttons (+, –) simultaneously to enter

• Improper waveform variation: Higher Lower

Fig. 2-3-1c

Improper

(a) Guide roller

(b) Guide pole

Proper

Fig. 2-3-1d

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

Note:

• Set a temporary level of the height of the A/C head in

advance to make the adjustment easier after the A/C head has been replaced. (See Fig.2-2-6c.)

Signal (A) • Mode (B) • PB Equipment (C) • Oscilloscope Measuring point (D1) • AUDIO OUT terminal

(D2) • TP4001 (CTL. P) External trigger (E) • TP111 (D.FF) Adjustment part (F) • A/C head [Mechanism assembly] Specified value (G) • Maximum waveform

(1) Play back the alignment tape (A). (2) Apply the external trigger signal to D.FF (E), to observe

the AUDIO OUT waveform and Control pulse waveform at the measuring points (D1) and (D2) in the ALT mode.

Alignment tape(SP, stairstep, PAL) [MHPE]

Fig. 2-3-2a

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

Signal (A1) • Mode (B) • PB Equipment (C) • Oscilloscope Measuring point (D) • TP106 (PB. FM) External trigger (E) • TP111 (D.FF) Adjustment part (F) • Specified value (G) • Maximum V.PB FM waveform Adjustment tool (H) • A/C head positioning tool [PTU94010]

Alignment tape(SP, stairstep, PAL) [MHPE]

A/C head base [Mechanism assembly]

(1) Play back the alignment tape (A1). (2) Apply the external trigger signal to D.FF (E), to observe

the V.PB FM waveform at the measuring point (D).

(3) Press the channel buttons (+, –) simultaneously to enter

the manual tracking mode. This also brings tracking to the center (centre).

(4) Loosen the screws (4) and (5), then set the A/C head

positioning tool to the innermost projected part of the A/ C head. (See Fig. 2-3-3a.)

(5) Turn the A/C head positioning tool fully toward the cap-

stan. Then turn it back gradually toward the drum and stop on the second peak point position of the V.PB FM waveform output level. Then tighten the screws (4) and (5).

(6) Perform the tracking operation and make sure that the

V.PB FM waveform is at its maximum. If it is not at maximum, loosen the screws (4) and (5), and turn the A/C head positioning tool to bring the A/C head to a position, around where the waveform reaches its maximum for the first time. Then tighten the screws (4) and (5).

2-17

[Perform adjustments steps (7) to (10) only for 2 Head

0.5 mm

Hole (A)

Edge

Marker

Tension arm assembly

Adjust pin

Tension brake assembly

Tension arm assembly

models equipped with LP mode.]

(7) Then play back the alignment tape (A2). (8) Press the channel buttons (+, –) simultaneously to enter

the manual tracking mode. This also brings tracking to the center (centre).

(9) Perform the tracking operation and make sure that the

V.PB FM waveform is at its maximum.

(10)

If it is not at maximum, loosen the screws (4) and (5), and turn the A/C head positioning tool to bring the A/C head to a position, around where the waveform reaches its maximum for the first time. Then tighten the screws (4) and (5).

Note:

• After adjusting, always perform the confirmation and re-adjustment of the item 2.3.4.

Toward the drum

A/C head positioning tool

To the drum

Audio control head

Toward the capstan

Head base

Screw

To the capstan

(4)

(5)

Fig. 2-3-3a

Alignment tape [SP, stairstep] played with the SP head

Alignment tape [EP(LP), stairstep] played with the EP(LP) head

(1) Play back the alignment tape (A). (2) Apply the external trigger signal to D.FF (E), to observe

the V.PB FM waveform at the measuring point (D).

(3) Confirm that the automatic tracking operation is com-

pleted.

(4) Set the VCR to the Auto adjust mode by transmitting the

code (F) twice from the Jig RCU. When the VCR enters the stop mode, the adjustment is completed.

(5) If the VCR enters the eject mode, perform adjustment for

the audio control head phase (X-value) again.

2.3.5 Checking/Adjustment of the Tension Pole Position

Signal (A) • Back tension cassette gauge

[PUJ48076-2]

Mode (B) • PB Adjustment part (F) • Adjust pin [Mechansim assembly] Specified value (G) • 25 - 51 gf•cm (2.45 – 5 × 10-3 Nm]

(1) Play back the back tension cassette gauge (A). (2) Check that the indicated value on the left side gauge is

within the specified value (G).

(3) If the indicated value is not within the specified value (G),

perform the adjustment in a following procedure.

1) Set the VCR to the mechanism service mode. (See

1.5 MECHANISM SERVICE MODE.)

2) Set the VCR to the play back mode and adjust by turning adjustment pin to align the tension arm assembly edge with the main deck hole (A) on the right edge marker. (See Fig. 2-3-5a)

Waveform output

X-value adjustment point

Drum side Control head position Capstan side

Maximum

Fig. 2-3-3b

2.3.4 Checking/Adjustment of the Standard Tracking Preset

Signal (A) • Mode (B) • PB ¥ Auto adjust Equipment (C) • Oscilloscope Measuring point (D) • TP106 (PB. FM) External trigger (E) • TP111 (D.FF) Adjustment part (F) • Jig RCU: Code “50” Specified value (G) • STOP mode

Adjustment tool (H) • Jig RCU [PTU94023B]

Alignment tape(LP, stairstep, PAL) [MHPE-L]

(Maximum V.PB FM waveform)

Fig. 2-3-5a

2-18

Mechanism Timing Chart

Mechanism mode

Control plate mark

Rotary encoder

Control cam angle

EJECT

END

E U CI

HIGH

C CH

LOW

HIGH

B CH

LOW

HIGH

A CH

LOW

CASS-

69 136 370 412.

CASS-INS

FF/REW

230

STOP

264.

REV

318.

SLOW/STILLPPLAY

Rotary encoder angle

Pole base

Pinch roller

Guide arm

Tension arm

Main brake S

Main brake T

Sub brake S

Sub brake T

Capstan brake

Direct gear

Change lever 2

Idler position

Take-up lever

Rec safety switch

Operation mode

HALF PRESS

CONTACT

ON PLAY

ON REV

CONTACT

(C-INS)

HALF REV

HALF FF/REW

CONTACT

IN FF/REW

OUT PLAY

SUPPLY

CENTER

TAKE-UP

READY

RESET

OFF

20 42.652.

114.

150.4167.8178.

(drum at stop)

POWER OFF

(cassette loaded)

207.2218.2240.2251.

Timer REC

standby

STOP

Backspace Slow FOR

Search REW

Slow REW

293.2304.2320.4335

REC pause

REC

Search FF

STOP

(

drum

in motion)

2-19

SECTION 3

ELECTRICAL ADJUSTMENT

3.1 PRECAUTION

The following adjustment procedures are not only necessary after replacement of consumable mechanical parts or board assemblies, but are also provided as references to be referred to when servicing the electrical circuitry. In case of trouble with the electrical circuitry, always begin a service by identifying the defective points by using the measuring instruments as described in the following electrical adjustment procedures. After this, proceed to the repair, replacement and/or adjustment. If the required measuring instruments are not available in the field, do not change the adjustment parts (variable resistor, etc.) carelessly.

3.1.1 Required test equipments

• Color (colour) television or monitor

• Oscilloscope: wide-band, dual-trace, triggered delayed

sweep

• Frequency counter

• Signal generator: RF / IF sweep / marker

• Signal generator: stairstep, color (colour) bar [PAL/SECAM]

• Recording tape

• Digit-key remote controller(provided)

3.1.2 Required adjustment tools

Jig RCU

PTU94023B

LPF

PTU93006

Alignment tape

(SP, stairstep, PAL)

MHPE

Alignment tape

(S-VHS, SP/LP, color (colour) bar)

MH-2H

Alignment tape

(SP, stairstep, NTSC)

MHP

3.1.4 Switch settings and standard precautions

The SW settings of the VCR and the standard precautions for the electrical adjustments are as follows.

• 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.

CUSTOM CODE 43: A CODE 53: B CODE

DATA CODE

INITIAL MODE

Fig. 3-1-4a Jig RCU [PTU94023B]

• Set the switches as shown below unless otherwise specified on the relevant adjustment chart. The switches that are not listed below can be set as desired. If the VCR is not equipped with the functions detailed below, setup is not required.

AUTO PICTURE/VIDEO CALIBRATION/ B.E.S.T./D.S.P.C.

PICTURE CONTROL/SMART PICTURE

VIDEO STABILIZER OFF

TBC ON

Digital 3R ON

VIDEO NAVIGATION/TAPE MANAGER

OFF

NORMAL/NATURAL

OFF

• Unless otherwise specified, all measuring points and adjustment parts are located on the Main board.

• In the Signal column of the adjustment chart, “Ext. Sinput” means the Y/C separated video signal and “Ext. input” means the composite video signal input.

3.1.3 Color (colour) bar signal,Color (colour) bar pattern

Colour bar signal [PAL]

•

White(100%)

White(75%)

0.7 V

0.3 V

Horizontal sync

Colour bar signal [SECAM]

0.7 Vp-p

0.3 Vp-p

Carrier(4.406 MHz)

Yellow

Cyan

R-Y

B-Y

Carrier(4.250 MHz)

R-Y colour BAR

Green

Magenta

Red

V(R-Y) U(B-Y)

White

Burst

Blue

White

Yellow

(100%)

R-Y

Cyan

B-Y colour BAR

(100%)

Horizontal sync

B-Y

Colour bar pattern [PAL]

•

(75%)

Cyan

White

0.3 V

U Black

Colour bar pattern [SECAM]

•

Green

Magenta

Red

Blue

White

R–Y

Yellow

White 100%

Cyan

White 100%

Green

Red

Magenta

Red

Magenta

B–Y Black

Blue

3.1.5 EVR Adjustment

Some of the electrical adjustments require the adjustment performed by the EVR system. The Main board assembly have EEPROMs for storing the EVR adjustment data and user setups.

Notes:

• In the EVR adjustment mode, the value is varied with the channel buttons (+, –). The adjusted data is stored when the setting mode changes (from PB to STOP, when the tape speed is changed, etc.). Take care to identify the current mode of each adjustment item when making an adjustment.

• When changing the address setting in the EVR adjustment mode, use the Jig RCU or the remote controller having numeric keypad with which a numeric code can be directly input. The remote control code of the Jig RCU corresponds to each of the digit keys on the remote controller as follows.

Digit-key 0 1 2 3 4 5 6 7 8 9 Code 20 21 22 23 24 25 26 27 28 29

• As the counter indication and remaining tape indication are not displayed FDP during the EVR adjustment mode, check them on the TV monitor screen.

3-1

• When performing the EVR adjustment, confirm that the FDP indication is changed to the EVR mode, as shown below.

FDP

Trigger point

V.sync

Switching point

V. rate

Fig. 3-1-5a EVR mode

3.2 SERVO CIRCUIT

3.2.1 Switching point

Signal (A1) • Stairstep signal

Mode (B) • PB

Equipment (C) • Oscilloscope

Measuring point (D1) • VIDEO OUT terminal

External trigger (E) • TP111 (D.FF)/slope : –

Adjustment part (F1) • Jig RCU: Code “5A”

Specified value (G1) • 7.5 ±0.5H

Adjustment tool (H) • Jig RCU [PTU94023B]

(A2) • (A3) •

(D2) • TP106 (PB. FM)

(F2) • Jig RCU: Code “51” or “52”

(G2) • 8.0 ±0.5H [MHPE]

Alignment tape(SP, stairstep, PAL) [MHPE] Alignment tape(SP, stairstep, NTSC) [MHP]

• TBC: OFF

• 7.5 ±0.5H [MHP]

[HR-S6700MS]

(1) Play back the signal (A1) of the alignment tape (A2). (2) Apply the external trigger signal to D.FF (E) to observe

the VIDEO OUT waveform and V.PB FM waveform at the measuring points (D1) and (D2).

(3) Press the channel buttons (+, –) simultaneously to enter

the manual tracking mode. This also brings tracking to the center (centre).

(4) Adjust tracking by pressing the channel buttons (+, –) so

that the V.PB FM waveform becomes maximum.

(5) Set the VCR to the Auto adjust mode by transmitting the

code (F1) from the Jig RCU. When the VCR enters the stop mode, the adjustment is completed.

(6) If the VCR enters the eject mode, repeat steps (1) to (5)

again.

(7) Play back the alignment tape (A2) again, confirm that the

switching point is the specified value (G1).

[HR-S7700MS]

(1) Play back the signal (A1) of the alignment tape (A2). (2) Apply the external trigger signal to D.FF (E) to observe

the VIDEO OUT waveform and V.PB FM waveform at the measuring points (D1) and (D2).

(3) Press the channel buttons (+, –) simultaneously to enter

the manual tracking mode. This also brings tracking to the center (centre).

(4) Adjust tracking by pressing the channel buttons (+, -) so

that the V.PB FM waveform becomes maximum.

(5) Transmit the code (F2) from the Jig RCU to adjust so that

the trigger point of the VIDEO OUT waveform is changed from the trailing edge of the V.sync signal becomes the

specified value (G2). (6) Set the VCR to the stop mode or eject mode. (7) Play back the signal (A1) of the alignment tape (A3). (8) Repeat steps (2) to (6).

3-2

Fig. 3-2-1a Switching point

3.2.2 Slow tracking preset

Signal (A1) • Ext. input

Mode (B1) • S-VHS SP

Measuring point (D) • TV-Monitor

Adjustment part (F) • Jig RCU: Code “71“ or “72”

Specified value (G) • Minimum noise

Adjustment tool (H) • Jig RCU [PTU94023B]

(A2) • Color (colour) bar signal [PAL]

(B2) • S-VHS LP

(1) Record the signal (A2) in the mode (B1), and play back

the recorded signal.

(2) Press the channel buttons (+, –) simultaneously to enter

the manual tracking mode. This also brings tracking to

the center (centre). (3) Set the VCR to the FWD slow (+1/6x) mode. (4) Transmit the code (F) from the Jig RCU to adjust so that

the noise bar becomes the specified value (G) on the TV

monitor in the slow mode. (5) Set the VCR to the Stop mode. (6) Confirm that the noise bar is (G) on the TV monitor in

the slow mode. (7) Repeat steps (3) to (6) in the REV slow (–1/6x) mode. (8) Repeat steps (1) to (7) in the mode (B2).

Note:

• For FWD slow (+1/6x) playback, transmit the code “08”

from the Jig RCU to enter the slow playback mode, and transmit the code “D0” for REV slow (–1/6x) mode.

3.3 VIDEO CIRCUIT

3.3.1 D/A level

Signal (A1) • Ext. S-input / Ext. input

Mode (B) • S-VHS

Equipment (C) • Oscilloscope

Measuring point (D) • Y OUT terminal (75Ø terminated)

Adjustment part (F) [HR-S6700MS]

Specified value (G) • 1.00 ± 0.015 Vp-p (reference value) (Note)

(A2) • Color (colour) bar signal [PAL] (A3) • S-VHS tape

• EE

• VR1201 (D/A LEVEL ADJ) [2D board]

[HR-S7700MS]

• VR1401 (D/A LEVEL ADJ) [3D board]

(1) Insert the cassette tape (A3) to enter the mode (B). (2) Observe the Y OUT waveform at the measuring point (D). (3) Check the Y level value when the External S-input (Y/C

separated video signal). (4)

Switch the input signal to the External input (composite

video signal), and adjust the adjustment part (F) so that

the Y level becomes the same value observed in step (3).

Note:

• The specified value (G) is just a reference value to be obtained when the External S-Video (Y/C separated video) signal is input. In actual adjustment, set it to the value observed in step (3).

Y level

H. rate

Fig. 3-3-1a D/A level

3.3.2 EE Y level

Signal (A1) • Ext. input

Mode (B) • EE

Equipment (C) • Oscilloscope

Measuring point (D) • Y OUT terminal (75Ø terminated)

EVR mode (F1) • Jig RCU: Code “57” EVR address (F2) •

Specified value (G) [HR-S6700MS]

Adjustment tool (H) • Jig RCU [PTU94023B]

(A2) • Color (colour) bar signal [PAL]

A:11 (Press remote controller “1” key twice)

• 1.00 ±0.05 Vp-p [HR-S7700MS]

• 1.00 ±0.03 Vp-p

• Digit-key remote controller

(1) Observe the Y OUT waveform at the measuring point (D). (2) Set the VCR to the EVR mode by transmitting the code

(F1) from the Jig RCU.

(3) Set the EVR address to (F2) by pressing the button of

the digit-key remote controller.

(4) Adjust with the channel buttons (+, –) on the VCR (or on

the remote controller) so that the Y level of the Y OUT waveform becomes the specified value (G).

(5) Release the EVR mode of the VCR by transmitting the

code (F1) from the Jig RCU again. (When the EVR mode is released, the adjusted data is memorized.)

3.3.3 PB Y level (S-VHS / VHS)

Signal (A1) • Ext. input

(A2) • Color (colour) bar signal [PAL]

Mode (B1) • S-VHS SP

(B2) • VHS SP

Equipment (C) • Oscilloscope

Measuring point (D) • Y OUT terminal (75Ø terminated)

EVR mode (F1) • Jig RCU: Code “57” EVR address (F2) • A:11 (Press remote controller

“1” key twice)

Specified value (G) [HR-S6700MS]

• 1.00 ±0.05 Vp-p [HR-S7700MS]

• 1.00 ±0.03 Vp-p

Adjustment tool (H) • Jig RCU [PTU94023B]

• Digit-key remote controller

(1) Observe the Y OUT waveform at the measuring point (D). (2) Record the signal (A2) in the mode (B1), and play back

the recorded signal.

(3) Press the channel buttons (+, –) simultaneously to enter

the manual tracking mode. This also brings tracking to the center (centre).

(4) Set the VCR to the EVR mode by transmitting the code

(F1) from the Jig RCU.

(5) Set the EVR address to (F2) by pressing the button of

the digit-key remote controller.

(6) Adjust with the channel buttons (+, –) on the VCR (or on

the remote controller) so that the Y level of the Y OUT waveform becomes the specified value (G).

(7) Release the EVR mode of the VCR by transmitting the

code (F1) from the Jig RCU again. (When the EVR mode is released, the adjusted data is memorized.)

(8) Repeat steps (2) to (7) in the mode (B2).

Y level

H. rate

Fig. 3-3-3a PB Y level

H. rate

Fig. 3-3-2a EE Y level

Y level

3.3.4 REC color (colour) level

Signal (A1) •

(A2) • Ext. input (A3) • Color (colour) bar signal [PAL]

Mode (B1) • S-VHS SP

(B2) • S-VHS LP

Equipment (C) • Oscilloscope

Measuring point (D1) • TP106 (PB. FM)

(D2) • PB color (colour) output of the LPF

External trigger (E) • TP111 (D.FF)

EVR mode (F1) • Jig RCU: Code “57” EVR address (F2) • A:02 (Press remote controller

Specified value (G) • SP: “B” x 125 ± 5%

Adjustment tool (H1) • Jig RCU [PTU94023B]

(H2) • Digit-key remote controller (H3) • LPF[PTU93006] (See Fig. 3-3-4a.)

Alignment tape(S-VHS,SP/LP,color(colour) bar)[MH-2H]

“0” and “2” keys)

• LP: “B” x 125 ± 5%

3-3

PB. FM

1 kØ 39 µH 180 µH

120 pF 180 pF

629 [kHz] PB COLOR (PB COLOUR)

Fig. 3-3-4a LPF

(1) Connect the adjustment tool (H3) to the measuring point

(D1).

(2) Apply the external trigger signal to D.FF (E) to observe

the PB color (colour) waveform at the measuring point (D2).

(3) Play back the signal (A3) in the mode (B1) of the align-

ment tape (A1).

(4) Press the channel buttons (+, –) simultaneously to enter

the manual tracking mode. This also brings tracking to the center (centre).

(5) Adjust tracking by pressing the channel buttons (+, –) so

that the PB color (colour) waveform becomes maximum. Make a note of the higher PB color (colour) level as “B” at this time.

(6) Record the signal (A3) in the mode (B1), and play back

the recorded signal.

(7) Set the VCR to the EVR mode by transmitting the code

(F1) from the Jig RCU.

(8) Set the EVR address to (F2) by pressing the button of

the digit-key remote controller.

(9) Adjust with the channel buttons (+, –) on the VCR (or on

the remote controller) so that the higher level channel becomes the specified value (G) of the note "B" level as shown in Fig. 3-3-4b. (Adjust before recording, then confirm it by playing back.)

(10) After adjustment, record the signal (A3) then playing

it back again. At this time, confirm that there is no inverting phenomenon or noise appearing on the playback screen.

(11)

Release the EVR mode of the VCR by transmitting the code (F1) from the Jig RCU again. (When the EVR mode is released, the adjusted data is memorized.)

(12)

Repeat steps (3) to (11) in the mode (B2).

Note:

• After adjusting, always perform the confirmation and re-adjustment of the item 3.4.1.

3.3.5 Video EQ (Frequency response)

Signal (A1) • Ext. S-input

Mode (B1) • S-VHS SP

Equipment (C) • Oscilloscope

Measuring point (D1) • Y OUT terminal (75Ø terminated) Frequency marker

External trigger (E) • TP111 (D.FF)

EVR mode (F1) • Jig RCU: Code “57” EVR address (F2) • A:03 (Press remote controller

Specified value (G) • SP: 3.6 ±0.4 div. (-1 ±1 dB)

Adjustment tool (H) • Jig RCU [PTU94023B]

(A2) • Video sweep signal

(B2) • S-VHS LP (B3) • Picture Control / Smart Picture

REC : Normal / Natural PB : Edit / Distinct

(D2) • 3 [MHz]

“0” and “3” keys)

• LP: 3.2 ±0.4 div. (-2 ±1 dB)

• Digit-key remote controller

(1) Apply the external trigger signal to D.FF (E) to observe

the Y OUT waveform at the measuring point (D1).

(2) Record the signal (A2) in the mode (B1), and play back

the recorded signal.

(3) Press the channel buttons (+, –) simultaneously to enter

the manual tracking mode. This also brings tracking to the center (centre).

(4) Set the VCR to the EVR mode by transmitting the code

(F1) from the Jig RCU.

(5) Set the EVR address to (F2) by pressing the button of

the digit-key remote controller.

(6) Set the slope of the oscilloscope to the channel having

higher (D2) marker level of the Y OUT waveform [signal (A2)]. Then set the 100 kHz marker level to the "4" scale on the oscilloscope. In this condition, adjust with the channel buttons (+, -) on the VCR (or on the remote controller) so that the (D2) marker level reaches the specified value (G).

(7) Release the EVR mode of the VCR by transmitting the

code (F1) from the Jig RCU again. (When the EVR mode is released, the adjusted data is memorized.)

(8) Repeat steps (2) to (7) in the mode (B2).

100 kHz

Four scale

Scale 4 (4 div.)

Specified value (G)

1 MHz

2 MHz

Frequency marker (D2)

5 MHz

3-4

Specified value (G)

V. rate

Fig. 3-3-4b REC color (colour) level

V. rate

Fig. 3-3-5a Video EQ (Frequency Response)

3.3.6 AUTO PICTURE initial setting

Signal (A1) • Ext. input

(A2) • Video: Optional (A3) • VHS tape

Mode (B) • EE ¥ Auto adjust (SP/LP REC ¥ PB)

Adjustment part (F) • Jig RCU : Code “58”

Specified value (G) • STOP mode

Adjustment tool (H) • Jig RCU [PTU94023B]

(1) Insert the cassette tape (A3). (2) Set the VCR to the Auto adjust mode by transmitting the

code (F) from the Jig RCU. When the VCR enters the stop mode, the adjustment is completed. When the VCR enters the eject mode, repeat steps (1) to (2) again.

3.4 AUDIO CIRCUIT

Pedestal level

Specified value (G)

B – Y signal

Blanking level

H.rate

3.5 PAL/SECAM CONVERTER CIRCUIT

Notes:

• This adjustment should be done after the “REC color (colour) level adjustment” for the video circuit has been completed.

• GND (Ground) should be taken from the Tuner shield case.

3.4.1 Audio REC FM

Signal (A1) • Ext. input

(A2) • Audio: No signal (A3) • Video: Color (colour) bar signal [PAL]

Mode (B) • S-VHS LP

Equipment (C) • Oscilloscope

Measuring point (D) • TP2253 (A. PB. FM)

External trigger (E) • TP111 (D.FF)

EVR mode (F1) • Jig RCU: Code “57” EVR address (F2) • A: 30 (Press remote controller “3” and

“0” keys.)

Specified value (G1) • 450 ±100 mVp-p

(G2) • More than 300 mVp-p

Adjustment tool (H) • Jig RCU [PTU94023B]

• Digit-key remote controller

(1) Apply the external trigger signal to D.FF (E) to observe

the Audio PB FM waveform at the measuring point (D).

(2) Record the signal (A3) with no audio signal input in the

mode (B), and play back the recorded signal.

(3) Press the channel buttons (+, –) simultaneously to enter

the manual tracking mode. This also brings tracking to the center (centre).

(4) If the A.PB FM level is not within the specified value (G1),

perform the adjustment in a following procedure.

(5) Set the VCR to the EVR mode by transmitting the code

(F1) from the Jig RCU.

(6) Set the EVR address to (F2) by pressing the button of

the digit-key remote controller.

(7) Adjust with the channel buttons (+, –) on the VCR (or on

the remote controller) so that the A.PB FM level of the higher channel level becomes the specified value (G1). (Adjust before recording, then confirm it by playing back.)

(8) If the specified value (G1) is not obtained, adjust with the

channel buttons (+, –) so that the waveform level of the lower channel level becomes the specified value (G2). (Adjust before recording, then confirm it by playing back.)

(9) Release the EVR mode of the VCR by transmitting the

code (F1) from the Jig RCU again. (When the EVR mode is released, the adjusted data is memorized.)

Note:

• Unless otherwise specified in this P/S Converter circuit adjustments, all measuring points and adjustment parts are located on the P/S Converter board.

3.5.1 fH VCO

Signal (A1) • Ext. input

Mode (B) • EE

Equipment (C) • Oscilloscope

Measuring point (D1) • IC3504 pin 4 (H OUT) Short point (D2) • TP3503

Adjustment part (F) • VR3501 (FH FREE RUN ADJ.)

Specified value (G) • fH = 15.625 ± 0.2 kHz

(A2) • Color (colour) bar signal [SECAM]

(T = 64 ± 0.8 µsec)

(1) Connect the short wire between the short point (D2) and

the GND (Ground).

(2) Observe the waveform appeared at the measuring point

(D1).

(3) Adjust the adjustment part (F) so that the fH SYNC fre-

quency becomes the specified value (G).

(4) Disconnect the short wire between the short point (D2)

and the GND (Ground).

FH–SYNC

Specified value (G)

H.rate

Fig. 3-5-1a fH VCO

3.5.2 DEMOD Fo

Signal (A1) • Ext. input

Mode (B) • EE

Equipment (C) • Oscilloscope

Measuring point (D1) • TP3501 round (B-Y)

Adjustment part (F1) • L3513 (SECAM DECODE ADJ.)

Specified value (G) • Less than 20 mVp-p

(A2) • Color (colour) bar signal [SECAM]

(D2) • TP3502 round (R-Y)

(F2) • VR3502 (SECAM DECODE ADJ.)

Specified value (G2)

V. rate

Fig. 3-4-1a Audio REC FM

Specified value (G1)

(1) Observe the B-Y waveform at the measuring point (D1). (2) Adjust the adjustment part (F1) so that the difference be-

tween the blanking level and the pedestal level of the BY waveform becomes the specified value (G).

Fig. 3-5-2a DEMOD Fo-1

(3) Observe the R-Y waveform at the measuring point (D2).

3-5

(4) Adjust the adjustment part (F2) so that the difference be-

tween the blanking level and the pedestal level of the RY waveform becomes the specified value (G).

Blanking level

Specified value (G)

Pedestal level

R – Y signal

3.5.4 PAL burst position

Signal (A1) • Ext. input

(A2) • Color (colour) bar signal [SECAM]

Mode (B) • EE

Equipment (C) • Oscilloscope

Measuring point (D1) • CN3502 pin 1

(D2) • TP3504 (CONV’D COLOR)

Adjustment part (F) • VR3503 (PAL BURST ADJ.)

Specified value (G) • Tr = 5.6 ± 0.1 µsec

H.rate

Fig. 3-5-2b DEMOD Fo-2

3.5.3 Colour difference level

Signal (A1) • Ext. input

(A2) • Color (colour) bar signal [SECAM]

Mode (B) • EE

Equipment (C) • Oscilloscope

Measuring point (D) • TP3504 round (CONV’D COLOR)

Adjustment part (F1) • L3513 (SECAM DECODE ADJ.)

(F2) • VR3502 (SECAM DECODE) (F3) • VR3506 (B-Y LEVEL ADJ.) (F4) • VR3505 (R-Y LEVEL ADJ.)

Specified value (G1) • Less than 30 mVp-p (CARRIER LEAK)

(G2) • 460 ± 20 mVp-p : VR3506 (B-Y) (G3) • 620 ± 20 mVp-p : VR3505 (R-Y)

(1) Observe the C (converted colour) waveform at the meas-

uring point (D).

(2) Fine adjust the adjustment part (F1) so that the carrier

leak becomes the specified value (G1). In case the adjustment cannot be accomplished, after fine adjust the adjustment part (F1) so that the carrier leak is reduced to its minimum level then fine adjust the adjustment part (F2).

(3) Adjust the adjustment part (F3) so that the higher level

of the Yellow and Blue of the C waveform becomes the specified value (G2).

(4) Adjust the adjustment part (F4) so that the higher level

of the Green and Magenta of the C waveform becomes the specified value (G3).

(1) Observe the waveforms appeared at the measuring

points (D1) and (D2).

(2) Adjust the adjustment part (F) so that the waveforms tim-

ing width between the H-SYNC and the colour burst signal becomes the specified value (G).

Colour burst signal

C (Converted colour)

H-SYNC

Specified value (G)

Fig. 3-5-4a PAL burst position

3-6

GREEN

CARRIER LEAK

Specified value (G1)

YELLOW

MAGENTA

Fig. 3-5-3a Colour difference level

BLUE

Specified value (G2)

Specified value (G3)

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

1.7 SYSCON CIRCUIT

MECHANISM ADJUSTMENT

2.1 BEFORE STARTING REPAIR AND ADJUSTMENT

2.2 REPLACEMENT OF MAJOR PARTS

2.3 COMPATIBILITY ADJUSTMENT

ELECTRICAL ADJUSTMENT

3.1 PRECAUTION

3.2 SERVO CIRCUIT

3.3 VIDEO CIRCUIT

3.4 AUDIO CIRCUIT

3.5 PAL/SECAM CONVERTER CIRCUIT