Jvc Hr-s6850ms User manual

SERVICE MANUAL

No. 82884

July 2001

HR-S6850MS/S7850MS/S7851MS/S8850MS

CARACTÉRISTIQUES TECHNIQUES

(The specifications shown pertain specifically to the model HR-S8850MS)

MAGNETOSCOPE

Printed in Japan

VICTOR COMPANY OF JAPAN, LIMITED

VIDEO DIVISION

S40894

This service manual is printed on 100% recycled paper.

HR-S6850MS/S7850MS/S7851MS/S8850MS

No. 82884

INSERT A.DUB

GÉNÉRALES

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

Consommation

Alimentation en marche : 22 W

Alimentation en veille : 3,8 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 278 mm

Poids : 3,7 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

(EP)* : 7,80 mm/s

Durée maximale d’enregistrement

(VN) : 240 mn avec une cassette vidéo E-240

(LD) : 480 mn avec une cassette vidéo E-240

(EP)* : 720 mn avec une cassette vidéo E-240

Signaux PAL seulement

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 à2,0 Vcc, 75 ohms, asymétrique

Sortie : 1,0 Vcc, 75 ohms, asymétrique

Rapport signal/bruit : 45 dB

Résolution horizontale : 400 lignes (S-VHS-PAL, VN/LD)

250 lignes (VHS-PAL, VN/LD)

350 lignes (S-VHS-PAL, EP)

220 lignes (VHS-PAL, EP)

240 lignes (VHS-SECAM, VN/LD)

Gamme de fréquence : 70 Hz à10.000 Hz (Audio normal)

20 Hz à20.000 Hz (Audio Hi-Fi)

Entrée/sortie : Connecteurs péritélévision à21 broches:

ENTREE/SORTIE x 1, ENTREE/DECODEUR x 1

Connecteurs RCA:

ENTREE VIDEO x 1, ENTREE AUDIO x 1,

SORTIE AUDIO x 1

Connecteurs S-Vidéo: ENTREE x 1, SORTIE x 1

SYNTONISEUR

Système de syntonisation : Syntoniseur àsynthèse de fréquence

Capacitéde canaux TV : 99 positions (+ position AUX)

Canaux couverts

MINUTERIE

Référence de l’horloge : Par quartz

Capacitéde programmation : Minuterie sur 1 an/8 programmes

Durée de soutien mémoire : 10 mn

ACCESSOIRES

Accessoires fournis : Câble RF,

Câble péritélévision à21 broches,

Contrôleur satellite,

Boîtier de télécommande àinfrarouge,

Pile “R6”x 2

ATTENTION:

Ce magnétoscope contient des microprocesseurs. Des bruits électroniques

externes ou des interférences peuvent causer un mauvais fonctionnement.

Dans de tels cas, couper l’alimentation et débrancher le cordon

d’alimentation. Puis le rebrancher et remettre l’alimentation. Sortir la cassette.

Après contrôle de la cassette, faire fonctionner l’appareil comme d’ordinaire.

Les caractéristiques techniques sont pour le mode VN àmoins

d’indication contraire.

Présentation et caractéristiques modifiables sans préavis.

Gamme

SECAM L PAL B/G

Fréquence Canaux Fréquence Canaux

VHF

49 MHz –65 MHz

2 –4

47 MHz –89 MHz

E2 –E4

(LOW) X, Y, Z

E5 –E12

VHF 104 MHz 5 –10 104 MHz S1 –S20

(HIGH) –300 MHz CATV –300 MHz M1 –M10

U1 –U10

Hyper

300 MHz –470 MHz

CATV

02 MHz –470 MHz

S21 –S41

UHF

470 MHz –862 MHz

21 –69

470 MHz –862 MHz

E21 –E69

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

3.3.2 EE Y/PB Y (S-VHS/VHS) level ......................................... 3-2

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

3.3.4 Video EQ (Frequency response) ..................................... 3-3

3.3.5 Auto picture initial setting ................................................. 3-4

3.4 Audio circuit .......................................................................... 3-4

3.4.1 Audio REC FM ................................................................. 3-4

3.5 Syscon circuit ....................................................................... 3-4

3.5.1 Timer clock ...................................................................... 3-4

3.6 PAL/SECAM Converter circuit .............................................. 3-5

3.6.1 Colour difference level ..................................................... 3-5

3.6.2 SECAM burst position ..................................................... 3-5

4. CHARTS AND DIAGRAMS

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

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

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

4.2 MAIN (VIDEO/AUDIO) SCHEMATIC DIAGRAM .................. 4-5

4.3 MAIN (ON SCREEN) SCHEMATIC DIAGRAM .................... 4-7

4.4 MAIN (SECAM) SCHEMATIC DIAGRAM ............................. 4-9

4.5 MAIN (SYSCON) SCHEMATIC DIAGRAM ........................ 4-11

4.6 MAIN (SW.REG) SCHEMATIC DIAGRAM ......................... 4-13

4.7 MAIN (TUNER) SCHEMATIC DIAGRAM ........................... 4-15

4.8

MAIN (SW/DISPLAY), MINI FRONT, S-JACK AND ADV. JOG

SCHEMATIC DIAGRAMS .....................................................

4-17

4.9 MAIN (MAIN TERMINAL) SCHEMATIC DIAGRAM ............ 4-19

4.10 2D DIGITAL SCHEMATIC DIAGRAM

[HR-S6850MS/S7850MS/S7851MS] ............................... 4-21

4.11 3D/TBC(2M) SCHEMATIC DIAGRAM [HR-S8850MS] .... 4-23

4.12 TERMINAL (S-SUB) SCHEMATIC DIAGRAM ................. 4-25

4.13 TERMINAL (I/O) SCHEMATIC DIAGRAM ....................... 4-27

4.14 DEMODULATOR SCHEMATIC DIAGRAM ...................... 4-29

4.15 S-P CONVERTER SCHEMATIC DIAGRAM .................... 4-31

4.16 MAIN CIRCUIT BOARD ................................................... 4-33

4.17 2D DIGITAL AND 3D DIGITAL/2M CIRCUIT BOARDS ... 4-36

4.18 TERMINAL CIRCUIT BOARD ......................................... 4-37

4.19

S-P CONVERTER AND DEMODULATOR CIRCUIT BOARDS

4-38

4.20 FDP GRID ASSIGNMENT AND ANODE CONNECTION 4-39

4.21 REMOTE CONTROLLER SCHEMATIC DIAGRAMS ...... 4-40

4.22 WAVEFORMS .................................................................. 4-41

4.23 VOLTAGE CHARTS ......................................................... 4-43

4.24 CPU PIN FUNCTION ....................................................... 4-45

4.25 SYSTEM CONTROL BLOCK DIAGRAM ......................... 4-47

4.26 VIDEO BLOCK DIAGRAM ............................................... 4-49

4.27 AUDIO BLOCK DIAGRAM ............................................... 4-53

5. PARTS LIST

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

5.2 FINAL 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 <05>(MODEL:A,B,C) ......... 5-14

3D DIGITAL/2M BOARD ASSEMBLY <05>(MODEL:D) .......... 5-15

TERMINAL BOARD ASSEMBLY <06> ................................... 5-16

A/C HEAD BOARD ASSEMBLY <12> ..................................... 5-18

DEMOD BOARD ASSEMBLY <14> ........................................ 5-18

MINI FRONT BOARD ASSEMBLY(MODEL:B,C,D)<28> ........ 5-19

S JACK BOARD ASSEMBLY <36> ......................................... 5-19

ADV.JOG BOARD ASSEMBLY <38> ....................................... 5-19

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

S/P CONVERTER BOARD ASSEMBLY <87> ........................ 5-19

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 set the “Service position” ..................................... 1-4

1.5 Mechanism service mode ..................................................... 1-4

1.5.1 How to set the “Mechanism service mode” ..................... 1-4

1.6 Jig RCU mode ...................................................................... 1-4

1.6.1 Setting the Jig RCU mode ............................................... 1-4

1.6.2 Setting the User RCU mode ............................................ 1-4

1.7 Servicing items related to video navigation .......................... 1-4

1.8 Emergency display function .................................................. 1-5

1.8.1 Displaying the EMG information ...................................... 1-5

1.8.2 Clearing the EMG history ................................................ 1-5

1.8.3 EMG content description ................................................. 1-6

1.8.4 EMG detail information <1> ............................................. 1-7

1.8.5 EMG detail information <2> ............................................. 1-8

2. MECHANISM ADJUSTMENT

2.1 Before starting repair and adjustment ................................... 2-1

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

2.1.2 Checking for proper mechanical operations .................... 2-1

2.1.3 Manually removing the cassette tape .............................. 2-1

2.1.4 Jigs and tools required for adjustment ............................. 2-2

2.1.5 Maintenance and inspection ............................................ 2-3

2.2 Replacement of major parts ................................................. 2-6

2.2.1 Before starting disassembling (Phase matching between

mechanical parts) ............................................................ 2-6

2.2.2 How to set the “Mechanism assembling mode” ............... 2-6

2.2.3 Cassette holder assembly ............................................... 2-6

2.2.4 Pinch roller arm assembly ............................................... 2-8

2.2.5 Guide arm assembly and press lever assembly .............. 2-8

2.2.6 A/C head ......................................................................... 2-8

2.2.7 Loading motor ................................................................. 2-8

2.2.8 Capstan motor ................................................................. 2-9

2.2.9 Pole base assembly (supply or take-up side) .................. 2-9

2.2.10 Rotary encoder ........................................................... 2-10

2.2.11 Clutch unit ................................................................... 2-10

2.2.12

Change lever assembly, direct gear, clutch gear and coupling gear

2-10

2.2.13 Link lever ..................................................................... 2-11

2.2.14 Cassette gear, control cam and worm gear ................ 2-11

2.2.15 Control plate ............................................................... 2-11

2.2.16

Loading arm gear (supply or take-up side) and

loading arm gear shaft ..................................................

2-12

2.2.17 Take-up lever, take-up head and control plate guide .. 2-13

2.2.18 Capstan brake assembly ............................................ 2-13

2.2.19 Sub brake assembly (take-up side) ............................ 2-13

2.2.20

Main brake assembly (take-up side), reel disk (take-up side)

and main brake assembly (supply side) ...............................

2-13

2.2.21 Tension brake assembly, reel disk (supply side) and

tension arm assembly ................................................. 2-14

2.2.22 Idler lever, idler arm assembly .................................... 2-14

2.2.23 Stator assembly .......................................................... 2-14

2.2.24 Rotor assembly ........................................................... 2-14

2.2.25 Upper drum assembly ................................................. 2-15

2.3 Compatibility adjustment .................................................... 2-16

2.3.1 FM waveform linearity ................................................... 2-16

2.3.2 Height and tilt of the A/C head ...................................... 2-17

2.3.3 A/C head phase (X-value) ............................................. 2-17

2.3.4 Standard tracking preset ............................................... 2-18

2.3.5 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

TABLE OF CONTENTS

Section Title Page Section Title Page

HR-S6850MS HR-S7850MS HR-S7851MS HR-S8850MS

FLYING ERASE HEAD NOT USED USED USED USED

DIGITAL 3R/TBC/FRAME MEMORY

NOT USED NOT USED NOT USED USED

YNR/CNR/S.COLOR

NOT USED / 2D/NOT USED NOT USED / 2D / NOT USED NOT USED / 2D / NOT USED USED (3D) / 3D / USED (3D)

RE-TAKE/ASSEMBLE EDIT NOT USED / A.F.E. USED / Z.F.E. USED / Z.F.E. USED / Z.F.E.

INSERT/OPERATION, NOT USED USED/BUTTON USED/BUTTON USED/BUTTON

AUDIO DUBBING / OPERATION

HiFi LEVEL METER NOT USED USED USED USED

R.PAUSE TERMINAL NOT USED USED USED USED

REAR OUT AUDIO L/R AUDIO L/R & S-OUT AUDIO L/R & S-OUT AUDIO L/R & S-OUT

CABLE BOX OR DBS. BOX OR SAT CTL

OPTION OPTION OPTION USED

CABLE MOUSE OPTION OPTION OPTION PROVIDED

RCU V13 SMALL 10KEY V13 SMALL 10KEY V13 SMALL 10KEY V13 LCD

RCU TYPE / COLOR V14#E11-S / SILVER V14#E11-S / SILVER V14#E11-S / SILVER V14#E5 / LIGHT BEIGE

RCU MBR /IR CODE NOT USED / A NOT USED / A NOT USED / A

USED (TV, SAT/CABLE) / A, B

F-AV CAP NOT USED USED USED USED

WINDOW COLOR SMOKE LIGHT GRAY SMOKE LIGHT GRAY GREEN SMOKE LIGHT GRAY

The following table lists the differing points between Models ( HR-S6850MS, HR-S7850MS, HR-S7851MS and HR-S8850MS) in this series.

Important Safety Precautions

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

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

when a set is being serviced.

Fig.1

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

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

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

and other cautionary notices appearing in the operation and serv-

ice manuals.

2. Parts identified by the !symbol and shaded ( ) parts are

critical for safety.

Replace only with specified part numbers.

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

ply with X-ray emission standards for products using

cathode ray tubes and those specified for compliance

with various regulations regarding spurious radiation

emission.

3. Fuse replacement caution notice.

Caution for continued protection against fire hazard.

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

4. Use specified internal wiring. Note especially:

1) Wires covered with PVC tubing

2) Double insulated wires

3) High voltage leads

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

especially:

1) Insulation Tape 3) Spacers 5) Barrier

2) PVC tubing 4) Insulation sheets for transistors

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

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

about the terminals before soldering.

Power cord

Fig.2

10. Also check areas surrounding repaired locations.

11. Products using cathode ray tubes (CRTs)

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

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

ance with recognized codes pertaining to X-ray emission.

Consequently, when servicing these products, replace the cath-

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

no circumstances attempt to modify these circuits.

Unauthorized modification can increase the high voltage value and

cause X-ray emission from the cathode ray tube.

12. Crimp type wire connector

In such cases as when replacing the power transformer in sets

where the connections between the power cord and power trans-

former primary lead wires are performed using crimp type connec-

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

safety hazards, perform carefully and precisely according to the

following steps.

1) Connector part number : E03830-001

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

will not damage insulated parts.

3) Replacement procedure

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

close to the connector.

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

Fig.7

cut close to connector

Fig.3

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

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

frayed conductors.

15 mm

Fig.4

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

wires fully into the connector.

Connector

Metal sleeve

Fig.5

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

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

complete closure of the tool.

•Precautions during Servicing

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

oxide metal film resistors, fusible resistors, etc.)

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

parts.

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

force in any direction will not loosen it.

1.25

2.0

5.5

Crimping tool

Fig.6

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

Not easily pulled free Crimped at approx. center

of metal sleeve

Conductors extended

Wire insulation recessed

more than 4 mm

S40888-01

•Safety Check after Servicing

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

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

standards.

1. Insulation resistance test

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

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

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

2. Dielectric strength test

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

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

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

3. Clearance distance

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

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

below.

4. Leakage current test

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

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

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

Measuring Method : (Power ON)

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

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

table 2.

5. Grounding (Class 1 model only)

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

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

Measuring Method:

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

Fig. 10

Fig. 9

Fig. 8

Table 1 Specifications for each region

Table 2 Leakage current specifications for each region

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

S40888-01

Externally

exposed

accessible part

1-1

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

[1] Top cover, D1 4(S1a), (S1b)

Bracket 2(S1c)

[2] Front panel assembly D2 CN7001(WR2a), <Note 2a>

CN916(WR2b), <Note 2b>

4(L2a), 3(L2b) <Note 2c>

ADV. Jog board assembly

2(S2a)

S Jack board assembly

2(S2b)

[3] Drum assembly D3 CON1(WR3a),

CN1(WR3b),

(S3a), (S3b), (S3c)

(Inertia plate) 4(L3a)

(Roller arm assy) (P3), (L3b)

[4] Mechanism assembly D4 CN2001(WR4a), <Note 2c>

(S4a),(S4b), <Note 4a>

(S4c), (S4d), 2(L4)

[5] S/P Converter board D5 CN601(WR5a), <Note 2c>

assembly 2(S5c)

Main board assembly (S5a),3(S5b),7(L5a)

[6] Bottom cover D6 2(L6a), 9(L6b) <Note 6a>

SECTION 1

DISASSEMBLY

1.3 Disassembly/assembly method

1.1 Disassembly flow chart

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 re-

verse order. Bend, route and dress the flat cables as they

were originally laid.

1.2

How to read the disassembly and assembly

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

Top cover, Bracket

Front panel assembly,

ADV. Jog board assembly,

S Jack board assembly

Drum assembly

Mechanism assembly

S/P Converter board assembly,

Main board assembly

Bottom cover

[1]

[2]

[3]

[4]

[5]

[6]

Step/

Loc No.

Part Name Fig.

No. Point Note

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

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

Step/

Loc No.

Part Name Fig.

No. Point Note

[1] Top cover, D1

4(S1a),(S1b),3(L1a), <Note 1a>

2(SD1a),(P1a),(W1a),

CN1(WR1a),

Bracket 2(S1c)

(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**).

• When reattaching the Front panel assembly, make sure that

the door opener “a” of the Cassette holder assembly is low-

ered in position prior to the reinstallation.

• When reattaching the Front panel assembly, pay careful at-

tention to the switch lever not to make it touch the switch

knob “b” of the Main board assembly from the side.

• 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 it is required to remove the screws (S4a to S4b) re-

taining the Mechanism assembly, please refer to the “Pro-

cedures for Lowering the Cassette holder assembly”(See

on page 1-2).

• When reattaching the Mechanism assembly to the Main

board assembly, take care not to damage the sensors and

switch on the Main board assembly.

• 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.

• The wire (WR4a) 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 accommo-

dated between the A/C head base and the main deck.

When removing the bottom cover, push down the two tabs

(L6a) to slide the bottom cover.

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

1-2

(L2a)

(L2b)

WR2a

(L2a)

CN7001

CN916

[2]

Front panel

assembly

a <Note 2a>

b <Note 2b>

WR2b

CN7108

(S2b)

S Jack

board assembly

WR2b

Front panel

back side

(S2a) ADV. Jog board

assembly

WR2a

Front panel

back side

CN7003

Fig. D1 Fig. D3

Fig. D2

Fig. 1

Fig. 2

Fig. 3

(A)

(B)

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 un-

screwed when removing the Mechanism assembly.

(S1a)

(S1c)

Bracket

[1] Top cover

[1]

(S1b)

Procedures for Lowering the Cassette holder assembly

(S3b)

[3]

Drum

assembly

CN1

CON1

WR3a

(L3a)

(L3b)

(P3)

Roller arm

assy

Inertia plate

(L3c)

WR3b

Cleaner assy

Not used

(S3a) (S3c)

Drum shield

(S3d)

Note: When installing the Drum assembly, secure the screws

(S3a to S3c) in the order of a, b, c.

Turn the loading motor pulley in the direction as indicated by

Fig.2. As both (A) and (B) 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 (A), (B), (B),

(A). When the holder has been lowered, turn the pulley until

the cassette holder is securely in place without allowing any

up/down movement.

1-3

[4]

Mechanism

assembly

Q3003

End sensor

Q3002

Start sensor

(S4b)

(S4a)

(S4c) (S4d)

D3001

LED

(L4)

Spacer

CN2001

A/C head base

WR4a

Note:

When installing the

Mechanism assembly,

secure the screws

(S4a to S4b) in the

order of a, b.

(L4)

Spacer

WR4a

S3002

S cassette switch

Fig. D4

Fig. D6

Fig. D5

[5]

Main board

assembly

(L5a)

(S5a)

(S5c)

WR5a

(S5b)

S/P Converter board assy

CN1601

(L6b)

[6]

Bottom cover

(L6b)

(L6a)

1-4

1.4 Service position

This unit has been designed so that the Mechanism and

Main board assemblies can be removed together from the

chassis assembly. Before diagnosing or servicing the cir-

cuit boards, take out the major parts from the chassis as-

sembly.

1.4.1 How to set the “Service position”

(1) Refer to the disassembly procedure and perform the dis-

assembly of the major parts before removing the Drum

assembly.

(2) Lower the cassette holder to prepare for the removal of

the Mechanism assembly screws. (Refer to the “Proce-

dures for lowering the Cassette holder assembly”of 1.3

Disassembly/assembly method.)

(3) Remove the combined Mechanism and Main board as-

semblies.

(4) Connect the wires and connectors of the major parts that

have been removed in step (1). (Refer to Fig.1-4-1a.)

(5) Place the combined Mechanism and Main board assem-

blies upside down.

(6) Insert the power cord plug into the power outlet and then

proceed with the diagnostics and servicing of the board

assembly.

Notes:

•Before inserting the power cord plug into the power

outlet, make sure that none of the electrical parts are

able to short-circuit between the workbench and the

board assembly.

•For the disassembly procedure of the major parts and

details of the precautions to be taken, see “1.3 Disas-

sembly/assembly method”.

•If there are wire connections from the Main board and

Mechanism assemblies to the other major parts, be

sure to remove them ( including wires connected to the

major parts ) first before performing step (2).

•When carrying out diagnosis and repair of the Main board

assembly in the “Service position”, be sure to ground

both the Main board and Mechanism assemblies. If they

are improperly grounded, there may be noise on the play-

back picture or FDP counter display may move even

when the mechanism is kept in an inoperative status.

•In order to diagnose the playback or recording of the cas-

sette tape, set the Mechanism assembly to the required

mode before placing it upside down. If the mechanism

mode is changed (including ejection) while it is in an up-

side down position the tape inside may be damaged.

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) Unplug the power cord plug from the power outlet.

(2) Connect TPGND and TP7001(TEST) on the Main board

assembly with a jump wire.

(3) Insert the power cord plug into the power outlet.

(4) With lock levers (A) (B) on the left and right of the Cas-

sette holder assembly pulled toward the front, slide the

holder in the same direction as the cassette insertion di-

rection. (For the positions of lock levers (A) (B), refer to

the “Procedures for lowering the Cassette holder assem-

bly”of 1.3 Disassembly/assembly method.)

(5) The cassette holder lowers and, when the loading has

completed, the mechanism enters the desired mode.

1.6 Jig RCU mode

This unit uses the following two modes for receiving remote

control codes.

1) User RCU mode : Ordinary mode for use by the user.

2) Jig RCU mode : Mode for use in production and serv-

icing.

When using the Jig RCU, it is required to set the VCR to

the Jig RCU mode (the mode in which codes from the Jig

RCU can be received). As both of the above two modes

are stored in the EEPROM, it is required to set the VCR

back to the User RCU mode each time that an adjustment

is made or to check that the necessary operations have

been completed. These modes can be set by the opera-

tions described below.

1.6.1 Setting the Jig RCU mode

(1) Unplug the power cord plug from the power outlet.

(2) Press and hold the “REC”and “PAUSE”buttons on the

VCR simultaneously, while plugging the power cord plug

into the power outlet.

When the VCR is set to the Jig RCU mode, the symbols

( “: ”) in the time display of the FDP are turned off.

1.6.2 Setting the User RCU mode

(1) Turn off the power.

(2) Press the “REC”and “PAUSE”buttons of the VCR si-

multaneously. Alternatively, transmit the code “80”from

the Jig RCU.

1.7 Servicing items related to video navigation

The video navigation function built into this unit works by

storing the video navigation data in the internal EEPROM

and writing data in the cassette tape simultaneously.

The video navigation data stored in the EEPROM cannot be

copied to another EEPROM. Therefore, when the circuit board

mounting the EEPROM is replaced, the original EEPROM

should be mounted on the new board. This will make the us-

er’s video navigation data usable with the new circuit board

after replacement. However, the user’s data cannot be restored

if the EEPROM on the original circuit board is damaged.

Note:

•

If the circuit board mounting the EEPROM or the

EEPROM alone has been replaced, it is required to per-

form confirmation/re-adjustment on all of the adjust-

ment items using the EVR as well as those which are

adjusted by transmitting adjustment codes from the Jig

RCU.

Fig. 1-4-1a

CP3002

TP7001

TEST

CN7001

CN7002

CN7005

CN7003

CN916

TPGND

TP2253

A.PB.

TP4001

CTL. P

CN511

CN1601

TP106

PB. FM

TP111

D.FF Main

board

assembly

VR1201

D/A LEVEL ADJ

VR1401

D/A LEVEL ADJ

C3025

Timer Clock

ADV. Jog board assembly

Mini front board assembly

2D Digital board

assembly

3D Digital/2M board

assembly

Demodulator board

assembly

S Jack board

assembly

Terminal board

assembly

S/P Converter

board assembly

ONLY USED FOR HR-S8850MS

ONLY USED FOR

HR-S7850MS/S7851MS/S8850MS

1-5

1.8 Emergency display function

This unit has a function for storing the history of the past two

emergencies (EMG) and displaying them on each FDP (or

OSD). With the status of the VCR and mechanism at the mo-

ment an emergency occurred can also be confirmed.

Fig. 1-8a Jig RCU [PTU94023B]

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

The FDP shows the EMG detail information <1> in the form

of “* 1 : * 2 : 34 ”.

* 1 : Deck operation mode at the moment of EMG

* 2 : Mechanism operation mode at the moment of EMG

3–: Mechanism sensor information at the moment of

EMG

–4 : Mechanism mode position at the moment of EMG

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

The FDP shows the EMG detail information <2> in the form

of “*5 : *6 : *7 ”.

* 5 : Type of the cassette tape in use <1> .

* 6 : Winding position of the cassette tape in use

* 7 : Type of the cassette tape in use <2> (Winding area)

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

set the display.

Notes:

•

For the OSD display model, all EMG information are

showed by transmitting first code from the Jig RCU.

•

For the EMG content, see “1.8.3 EMG content descrip-

tion”.

•

For the EMG detail information <1> , see “1.8.4 EMG de-

tail information <1> ”.

•

For the EMG detail information <2>

, see “1.8.5 EMG de-

tail information <2>”.

1.8.2 Clearing the EMG history

(1) Display the EMG history.

(2) Transmit the code “36”from the Jig RCU.

(3) Reset the EMG display.

<Example 1> E : 01 : 03

Previous EMG

Latest EMG

No EMG record

<Example 2> E : ––: ––

1.8.1 Displaying the EMG information

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

The FDP shows the EMG content in the form of “E:**:**”.

INITIAL MODE

DATA CODE

CUSTOM CODE

43: A CODE

[Data transmitting method]

Depress the “ ” ( 3 ) button

after the data code is set.

Jig RCU

Notes:

•

The EMG detail information <1><2>

show the information

on the latest EMG.

It becomes “––: ––: ––” when there is no latest EMG

record.

•

When using the Jig RCU, it is required to set the VCR to

the Jig RCU mode (the mode in which codes from the Jig

RCU can be received).

FDP display model

[FDP display]

0 : 00 : 00

E: ** :**

*1: *2 : 34

*5: *6 : *7

E: **:**

*1: *2 : 34

*5: *6 : *7

EMG detail information <2>

EMG detail information <1>

EMG content display

(E:Latest:Previous)

Normal display

OSD display model

[OSD display]

EMG EMG content display

(E:Latest:Previous)

FDP (7segment LED) display model

[FDP display]

0: 00

E: **

1: **

2: *1

3: *2

4: 34

5: *5

6: *6

7: *7

Normal display

EMG content display (Latest)

EMG content display (Previous)

EMG detail information <1>

[Deck operation mode]

EMG detail information <1>

[Mechanism operation mode]

EMG detail information <1>

[Mechanism sensor information and Mechanism mode position]

EMG detail information <2>

[Type of the cassette tape in use <1>]

EMG detail information <2>

[Winding position of the cassette tape in use]

EMG detail information <2>

[Type of the cassette tape in use <2> (Winding area)]

(EMG-02e)

1-6

1.8.3 EMG content description

Note:

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

Table 1-8-3a

When the mechanism mode cannot be changed to an-

other 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 an-

other 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 iden-

tified, the pinch rollers are turned off and stopped, and

the power is turned off.

When the eject operation does not complete in 3 sec-

onds 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 sec-

onds, [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.

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 posi-

tion 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 wind-

ing 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 wind-

ing 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 tempera-

ture, 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 sup-

plied 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.

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.

FDP CONTENT CAUSE

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.

EC1 or EU1:

Head clog warning

E0A:Supply Reel

Pulse EMG

E07: SW Power

Short-Circuit

EMG

E06: Capstan FG

EMG

E05: Cassette Eject

EMG

E04: Drum FG

EMG

E03: Take Up Reel

Pulse EMG

E02:

Unloading EMG

E01: Loading EMG

E08:

DD Initialized

(Absolute

Position

Sensor)

EMG

E09: DD FG EMG

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