JVC HRS9800U - Service Manual Immediate Download

No. 82805

June 2000

HR-S9800U

SPECIFICATIONS

CANCEL

TIMER

START

STOP

DATE

PLAY

REW

REC

STOP

PAUSE

POWER

TV/VCR

C. RESET

DBS

. , ?

ABC

DEF

DHI

JKL

MNO

PQRS

TUV

WXYZ

DAILY(M-F)

AUX

WEEKLY

PROG

CHECK

PROG

SP/EP

SKIP SEARCH

A/B

DISPLAY

ENTER/OSD

A.MONITOR

VCR TV CABLE/DBS

123

EXPRESS PROGRAMMING

JOG/

SHUTTLE

M ENU

NAVIGAT

ION

TV CH +

TV CH

VOL

This service manual is printed on 100% recycled paper.

VIDEO CASSETTE RECORDER

SERVICE MANUAL

GENERAL

Power requirement

: AC 120 V` , 60 Hz

Power consumption

Power on

: 27 W

Power off

: 2.6 W

Temperature

Operating

: 5°C to 40°C (41°F to 104°F)

Storage

: 20°C to 60°C (4°F to140°F)

Operating position

: Horizontal only

Dimensions (W x H x D) : 437 mm x 97 mm x 347 mm

(17-1/4" x 3-7/8" x 13-11/16")

Weight

: 4.8 kg (10.6 lbs)

Format

: S-VHS/VHS NTSC standard

Maximum recording time

: 210 min. with ST-210 video cassette

: 630 min. with ST-210 video cassette

VIDEO/AUDIO

Signal system

: NTSC-type color signal and EIA

monochrome signal, 525 lines/60 fields

Recording/

Playback system

: DA-4 (Double Azimuth) head helical

scan system

Signal-to-noise ratio

: 45 dB

Horizontal resolution

VHS

: 230 lines

S-VHS

: 400 lines

Frequency range

Normal audio

: 70 Hz to 10,000 Hz

Hi-Fi audio

: 20 Hz to 20,000 Hz

Input/Output

: RCA connectors (IN x 2, OUT x 1)

S-video connectors (IN x 2, OUT x 1)

TUNER

Tuning system

: Frequency-synthesized tuner

Channel coverage

VHF

: Channels 213

UHF

: Channels 1469

CATV

: 113 Channels

RF output

: Channel 3 or 4 (switchable; preset

to Channel 3 when shipped) 75

unbalanced

TIMER

Clock reference

: Quartz

Program capacity

: 1-year programmable timer/

8 programs

Memory backup time

: Approx. 3 min.

ACCESSORIES

Provided accessories

: Infrared remote control unit,

"AA" battery x 2,

Audio/video cable,

RF cable (F-type),

S-video cable (4-pin),

S-VHS ET labels,

Controller

Specifications shown are for SP mode unless specified otherwise.

E. & O.E. Design and specifications subject to change without notice.

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

1.8 SERVICING THE VIDEO NAVIGATION FUNCTION .... 1-12

1.8.1 Copying the video navigation data .......................... 1-12

1.8.2 Erasing the video navigation data (Initialization) ..... 1-13

1.8.3 Factory setting level during shipment ...................... 1-13

2. MECHANISM ADJUSTMENT

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

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

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

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

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

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

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

2.2.1 Before Starting Disassembling (Phase matching

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

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

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

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

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

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

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

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

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

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

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

2.2.12 Change Lever Assembly, Direct Gear, Clutch Gear

and Coupling Gear ................................................ 2-10

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

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

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

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

Loading Arm Gear Shaft ........................................ 2-12

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

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

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

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

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

2.2.21 Tension Brake Assembly, Reel Disk (supply side)

and Tension Arm Assembly .................................... 2-14

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

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

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

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

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

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

2.3.2 Checking/Adjustment of the Height and Tilt of the

Audio Control Head ................................................. 2-17

2.3.3 Checking/Adjustment of the Audio Control Head Phase

(X-Value) ........................................................................ 2-17

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

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

3. ELECTRICAL ADJUSTMENT

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

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

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

TABLE OF CONTENTS

Section

Title

Page

Section

Title

Page

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

3.2.3 Dynamic Drum preset ................................................ 3-2

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

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

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 ............................................ 3-4

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

3.3.6 AUTO PICTURE initial setting ................................... 3-5

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

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

3.5 DEMODULATOR CIRCUIT ............................................. 3-5

3.5.1 Input level .................................................................. 3-5

3.5.2 Stereo VCO ............................................................... 3-5

3.5.3 Stereo filter ................................................................ 3-6

3.5.4 Separation - 1 ............................................................ 3-6

3.5.5 Separation - 2 ............................................................ 3-6

3.5.6 SAP VCO ................................................................... 3-6

4. CHARTS AND DIAGRAMS

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

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

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

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

4.3 VSC SCHEMATIC DIAGRAM ........................................ 4-7

4.4 SYSTEM CONTROL SCHEMATIC DIAGRAM .............. 4-9

4.5 SWITCHING REGULATOR SCHEMATIC DIAGRAM .. 4-11

4.6 TUNER SCHEMATIC DIAGRAM ................................. 4-13

4.7 CONNECTION SCHEMATIC DIAGRAM ..................... 4-15

4.8 3D DIGITAL/4M SCHEMATIC DIAGRAM .................... 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 NAVIGATION SCHEMATIC DIAGRAM .................... 4-25

4.13 SW/DISPLAY, REC SAFETY, JACK AND JOG

SCHEMATIC DIAGRAMS ......................................... 4-27

4.14 GR SCHEMATIC DIAGRAM ..................................... 4-29

4.15 MAIN, AUDIO ERASE, A/C HEAD AND

LOADING MOTOR CIRCUIT BOARDS .................... 4-33

4.16 3D DIGITAL/4M CIRCUIT BOARD ............................ 4-35

4.17 TERMINAL CIRCUIT BOARD ................................... 4-36

4.18 DEMODULATOR CIRCUIT BOARD ......................... 4-37

4.19 S-SUB CIRCUIT BOARD .......................................... 4-37

4.20 NAVIGATION CIRCUIT BOARD ............................... 4-39

4.21 GR CIRCUIT BOARD ................................................ 4-40

4.22 SW/DISPLAY, REC SAFETY, JACK AND JOG

CIRCUIT BOARDS .................................................... 4-41

4.23 FDP GRID ASSIGNMENT AND ANODE CONNECTION 4-43

4.24 REMOTE CONTROL SCHEMATIC DIAGRAM ......... 4-44

4.25 VOLTAGE CHARTS .................................................. 4-45

4.26 SYSTEM CONTROL BLOCK DIAGRAM .................. 4-49

4.27 VIDEO BLOCK DIAGRAM ........................................ 4-51

4.28 AUDIO BLOCK DIAGRAM ........................................ 4-55

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

3D DIGITAL/4M BOARD ASSEMBLY <05> ...................... 5-12

TERMINAL BOARD ASSEMBLY <06> .............................. 5-13

AUDIO CONTROL HEAD BOARD ASSEMBLY <12> ....... 5-14

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

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

NAVIGATION BOARD ASSEMBLY <19> .......................... 5-15

DISPLAY BOARD ASSEMBLY <28> ................................. 5-16

REC SAFETY BOARD ASSEMBLY <32> ......................... 5-17

S JACK BOARD ASSEMBLY <36> ................................... 5-17

JOG BOARD ASSEMBLY <37> ........................................ 5-17

AUDIO ERASE BOARD ASSEMBLY <46> ....................... 5-17

LOADING MOTOR BOARD ASSEMBLY <55> ................. 5-17

GR BOARD ASSEMBLY <96> .......................................... 5-17

Important Safety Precautions

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

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

when a set is being serviced.

Fig.1

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

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

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

and other cautionary notices appearing in the operation and serv-

ice manuals.

2. Parts identified by the

symbol and shaded (

) parts are

critical for safety.

Replace only with specified part numbers.

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

ply with X-ray emission standards for products using

cathode ray tubes and those specified for compliance

with various regulations regarding spurious radiation

emission.

3. Fuse replacement caution notice.

Caution for continued protection against fire hazard.

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

4. Use specified internal wiring. Note especially:

1) Wires covered with PVC tubing

2) Double insulated wires

3) High voltage leads

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

especially:

1) Insulation Tape

3) Spacers

5) Barrier

2) PVC tubing

4) Insulation sheets for transistors

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

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

about the terminals before soldering.

Power cord

Fig.2

10. Also check areas surrounding repaired locations.

11. Products using cathode ray tubes (CRTs)

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

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

ance with recognized codes pertaining to X-ray emission.

Consequently, when servicing these products, replace the cath-

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

no circumstances attempt to modify these circuits.

Unauthorized modification can increase the high voltage value and

cause X-ray emission from the cathode ray tube.

12. Crimp type wire connector

In such cases as when replacing the power transformer in sets

where the connections between the power cord and power trans-

former primary lead wires are performed using crimp type connec-

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

safety hazards, perform carefully and precisely according to the

following steps.

1) Connector part number : E03830-001

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

will not damage insulated parts.

3) Replacement procedure

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

close to the connector.

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

Fig.7

cut close to connector

Fig.3

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

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

frayed conductors.

15 mm

Fig.4

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

wires fully into the connector.

Connector

Metal sleeve

Fig.5

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

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

complete closure of the tool.

·Precautions during Servicing

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

oxide metal film resistors, fusible resistors, etc.)

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

parts.

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

force in any direction will not loosen it.

1.2

2.0

5.5

Crimping tool

Fig.6

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

Not easily pulled free

Crimped at approx. center

of metal sleeve

Conductors extended

Wire insulation recessed

more than 4 mm

S40888-01

·Safety Check after Servicing

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

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

standards.

1. Insulation resistance test

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

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

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

2. Dielectric strength test

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

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

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

3. Clearance distance

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

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

below.

4. Leakage current test

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

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

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

Measuring Method : (Power ON)

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

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

table 2.

5. Grounding (Class 1 model only)

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

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

Measuring Method:

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

Fig. 10

Fig. 9

Fig. 8

Table 1 Specifications for each region

Table 2 Leakage current specifications for each region

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

S40888-01

Externally

exposed

accessible part