JVC HMHDS1U - Service Manual Immediate Download

SERVICE MANUAL

No. 82853

April 2001

HM-HDS1U

SPECIFICATIONS

HDD / VHS DUAL RECORDER

Printed in Japan

This service manual is printed on 100% recycled paper.

HM-HDS1U

No.

82853

JVC SERVICE & ENGINEERING COMPANY OF AMERICA

DIVISION OF JVC AMERICAS CORP.

Head office

East Coast

Midwest

West Coast

Atlanta

Hawaii

1700 Valley Road Wayne, New Jersey 07470-9976

10 New Maple Avenue Pine Brook, New Jersey 07058-9641

705 Enterprise Street Aurora, Illinois 60504-8149

5665 Corporate Avenue Cypress, California 90630-0024

1500 Lakes Parkway Lawrenceville, Georgia 30043-5857

2969 Mapunapuna Place Honolulu, Hawaii 96819-2040

(973)315-5000

(973)396-1000

(630)851-7855

(714)229-8011

(770)339-2582

(808)833-5828

JVC CANADA INC.

Head office

Montreal

Vancouver

21 Finchdene Square Scarborough, Ontario M1X 1A7

16800 Rte Trans-Canadienne, Kirkland, Quebec H9H 5G7

13040 Worster Court Richmond, B.C. V6V 2B3

(416)293-1311

(514)871-1311

(604)270-1311

S40895-03

DIGITPURE TECHNOLOGY

S-VHS ET

S-VHS

HDD

HM-HDS1

REC LINK

NAVI

STOP

PLAY

PAUSE

REC

REW

FEW

A. DUB

EJECT

VIDEO

PAUSE

S-VIDEO

(M) L AUDIO R

POWER

F - 1

GENERAL

Power requirement

: AC 120 V`, 60 Hz

Power consumption

Power on

: 45 W

Power off

: 14 W

Temperature

Operating

: 5°C to 40°C (41°F to 104°F)

Storage

: 20°C to 60°C (4°F to 140°F)

Operating position

: Horizontal only

Dimensions (WxHxD) : 435 mm x 124 mm x 385 mm

(17-1/16" x 4-15/16" x 15-3/16")

Weight

: 7.4 kg (16.4 lbs)

Input/Output

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

S-Video connectors:(IN x 1, OUT x 2)

HDD DECK VIDEO/AUDIO

Video format

: MPEG2 (VBR)

Audio format

: MPEG1 Layer2

Maximum recording time

(SP)

: 14 hours

(LP)

: 20 hours

(EP)

: 28 hours

(SEP)

: 40 hours

VHS DECK VIDEO/AUDIO

Signal system

: NTSC-type colour signal and EIA monochrome

signal, 525 lines/60 fields

Recording system

: DA4 (Double Azimuth) head helical scan system

Format

: S-VHS/VHS NTSC standard

Signal-to-noise ratio

: 45 dB

Horizontal resolution

: 240 lines (VHS)

400 lines (S-VHS)

Frequency range

: 70 Hz to 10,000 Hz (Normal audio)

20 Hz to 20,000 Hz(Hi-Fi audio)

Maximum recording time

(SP)

: 210 min. with ST-210 video cassette

(EP)

: 630 min. with ST-210 video cassette

TUNER

Tuning system

: Frequency-synthesized tuner

Channel coverage

VHF

: Channels 213

UHF

: Channels 1469

CATV

: 113 Channels

TIMER

Clock reference

: Quartz

Program capacity

: 1-year programmable timer/

16 programs each on the VHS and

HDD deck

Memory backup time

: Approx. 60 min.

ACCESSORIES

Provided accessories

: RF cable (F-type),

Infrared remote control unit, "AA"

battery x 2,

Audio/Video Cable,

S-Video cable (4-pin),

Controller

Specifications shown are for SP mode unless otherwise specified.

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

Hard Disk Drive (HDD)

1. Hard Disk Drive (HDD) Handling Precautions

The HDD is a precision device for use in reading and writing a large amount of data on or from a disk rotating at

a high speed. If it is not handled carefully, either abnormal operation may result or it may not be possible to read

data. The HDD is sensitive to the following items and special care is required in safeguarding against them when

handling an HDD. Also take care in handling a set incorporating an HDD.

1. Vibrations and impacts

2. Static electricity

3. Rough handling

1.1

Handling in transport, etc.

s Be sure to place the HDD in the manufacturer's specified package

carton before transport.

s When receiving a package containing an HDD, check that the pack-

age carton is not damaged (such as having holes in the carton,

crushed corners, etc.).

s Do not impact the packaging carton when loading or unloading it.

s It is not permitted to use the inner package carton only for transport-

ing an HDD.

s Do not stack package cartons one upon another.

1.2

Handling an HDD in the stand-alone status

s When handling an HDD on a hard workbench, place an antistatic

mat (rubber sheet) or similar object on the hard surface (to prevent

any impacts occurring between the HDD and bench).

s Do not stack the HDDs one upon another.

s Do not knock an HDD with a hard object (such as a screwdriver).

s Do not place an HDD on its side panel without using a support (do

not place an HDD in an unstable position).

1.3

Handling the installation of an HDD

s Place antistatic mats or similar sheets on all of the surfaces on which work is conducted or when the HDD

is transported.

s Do not permit the HDD to knock against the set's brackets.

s When screwing the brackets, be careful not to knock the HDD. When using a power screwdriver, use a low-

shock model and arrange the tightening torque properly.

s When mounting an HDD in a computer, take care not to apply excessive force to the brackets.

HDD

Do not throw or

drop packages.

Be sure to package and

transport the HDDs correctly.

2. In Case of an HDD Failure

When a computer AC cord is plugged into a power outlet, the boot loader is read from the IC8204 (8M FLASH

ROM), which activates the HDD and reads the system files in the HDD before getting ready for operation. In

consequence, the computer cannot be turned on if the HDD fails.

In case a failure of the HDD is in doubt, use the following procedure to switch the main power of the set ON using

the VHS section alone, by bypassing the HDD operation check.

(1) With the computer in the remote control standby status, trans-

mit code 7b from the remote jig for more than 2 seconds.

(2) The BS digital reservation button on the computer blinks, indi-

cating that the power supply can be switched ON.

(3) When the code 7B is transmitted again from the remote jig,

the button stops blinking and its function is canceled.

Initial mode

Data code

Custom code

43: A code

52: B code

HDD

HM-HDS1

POWER

BS DIGIATL

CHANNEL

Blinks.

ASIC_IF

MPEG_DEC

40GB

HDD

IC8201

IC8001

8M FLASH

OPEN

IC8204

IC8205

IC8206

IC8207

DVD 0_:7_

VIO 0:7

IDE 40PIN

AD 0:31

AD 4:11

AD 12:19

LADO

4:11

LADO

12:19

AD 0:15

AD 16:31

AD 4:19

VHS

SYSCON

HOSTD

US_IN

US_OUT

Address

Latch

Address

Latch

E:08 is displayed in the

case of a

communication error

with the VHS SYSCON

Firmware

HDD driver

Navigation information

boot loader

VHS Navi

back up

Hard Disk Drive (HDD)

Important Safety Precautions

INSTRUCTIONS

1. DISASSEMBLY

1.1 HOW TO REMOVE THE MAJOR PARTS ..................................................... 1-1

1.1.1 Introduction .................................................................................... 1-1

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

1.3 DISCONNECTION OF CONNECTORS (WIRES) ........................................ 1-1

1.4 SCREWS USED CABINET COMPONENTS AND BOARD ASSEMBLIES .. 1-1

1.5 HOW TO REMOVE THE MAJOR PARTS <COM section> ........................... 1-2

1.5.1 Disassembly flow chart .................................................................. 1-2

1.5.2 Disassembly/assembly method <COM section> ............................ 1-2

1.6 HOW TO REMOVE THE MAJOR PARTS <VHS section> ............................ 1-4

1.6.1 Disassembly flow chart .................................................................. 1-4

1.6.2 DIsassembly/assembly method <VHS section> ............................ 1-4

1.7 HOW TO REMOVE THE MAJOR PARTS <HDD section> ............................ 1-6

1.7.1 Disassembly flow chart .................................................................. 1-6

1.7.2 DIsassembly/assembly method <HDD section> ............................ 1-6

1.8 SERVICE POSITIONS .................................................................................. 1-7

1.8.1 Service position <VHS SIDE> ........................................................ 1-7

1.8.2 Service position <HDD side> ......................................................... 1-8

1.9 MECHANISM SERVICE MODE .................................................................... 1-9

1.9.1 How to set the "MECHANISM SERVICE MODE" .......................... 1-9

1.10 CONNECTION .................................................................................. 1-10

1.11 EMERGENCY DISPLAY FUNCTION ................................................ 1-12

1.11.1 Displaying the emergency information ........................................ 1-12

1.11.2 Clearing the emergency history ................................................... 1-12

1.11.3 Emergency content description ................................................... 1-13

1.11.4 Emergency detail information 1 ................................................. 1-14

1.11.5 Emergency detail information 2 ................................................. 1-15

2. MECHANISM ADJUSTMENT (VHS)

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 (VHS)

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

TABLE OF CONTENTS

Section

Title

Page

Section

Title

Page

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

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

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 DIGITAL CIRCUIT ......................................................................................... 3-4

3.4.1 HDD EE Y level .............................................................................. 3-4

3.4.2 HDD PB Y level .............................................................................. 3-5

3.4.3 HDD PB C burst level ..................................................................... 3-5

3.5 AUDIO CIRCUIT ........................................................................................... 3-5

3.5.1 Audio REC FM ............................................................................... 3-5

3.6 DEMODULATOR CIRCUIT ........................................................................... 3-6

3.6.1 Input level ....................................................................................... 3-6

3.6.2 Stereo VCO .................................................................................... 3-6

3.6.3 Stereo filter ..................................................................................... 3-6

3.6.4 Separation - 1 ................................................................................. 3-6

3.6.5 Separation - 2 ................................................................................. 3-7

3.6.6 SAP VCO ....................................................................................... 3-7

4. CHARTS AND DIAGRAMS

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

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

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

4.2 SWITCHING REGULATOR AND REGULATOR SCHEMATIC DIAGRAMS ........... 4-5

4.3 VIDEO/AUDIO SCHEMATIC DIAGRAM ....................................................... 4-7

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

4.5 VIDEO I/O SWITCH SCHEMATIC DIAGRAM ............................................ 4-13

4.6 AUDIO I/O SCHEMATIC DIAGRAM ............................................................ 4-15

4.7 CONNECTION SCHEMATIC DIAGRAM .................................................... 4-17

4.8 TUNER SCHEMATIC DIAGRAM ................................................................ 4-19

4.9 3D DIGITAL/2M SCHEMATIC DIAGRAM ................................................... 4-21

4.10 TERMINAL SCHEMATIC DIAGRAM ........................................................ 4-23

4.11 DEMODULATOR SCHEMATIC DIAGRAM ............................................... 4-25

4.12 S-SUB SCHEMATIC DIAGRAM ............................................................... 4-27

4.13 ON SCREEN SCHEMATIC DIAGRAM ..................................................... 4-29

4.14 EJECT SW, DIAPLAY, JACK, LED/SW AND LED SCHEMATIC DIAGRAMS .. 4-31

4.15 DIGITAL P.SUP SCHEMATIC DIAGRAM .................................................. 4-33

4.16 DIGITAL VIDEO SCHEMATIC DIAGRAM ................................................. 4-35

4.17 DIGITAL AUDIO SCHEMATIC DIAGRAM ................................................ 4-37

4.18 DIGITAL MPEG DEC SCHEMATIC DIAGRAM ......................................... 4-39

4.19 DIGITAL MPEG ENC SCHEMATIC DIAGRAM ......................................... 4-41

4.20 DIGITAL ASIC IF SCHEMATIC DIAGRAM ............................................... 4-43

4.21 SWITCHING REGULATOR AND REGULATOR CIRCUIT BOARDS ....... 4-45

4.22 3D DIGITAL/2M AND S-SUB CIRCUIT BOARDS .................................... 4-47

4.23 TERMINAL CIRCUIT BOARD .................................................................. 4-48

4.24 EJECT SW, DISPLAY, LED/SW, JACK AND LED CIRCUIT BOARDS ..... 4-49

4.25 MAIN CIRCUIT BOARD ........................................................................... 4-51

4.26 DEMODULATOR AND ON SCREEN CIRCUIT BOARDS ........................ 4-54

4.27 DIGITAL CIRCUIT BOARD ....................................................................... 4-55

4.28 FDP GRID ASSIGNMENT AND ANODE CONNECTION ........................ 4-58

4.29 REMOTE CONTROL SCHEMATIC DIAGRAM ........................................ 4-58

4.30 WAVEFORMS ........................................................................................... 4-59

4.31 VOLTAGE CHARTS .................................................................................. 4-61

4.32 CPU PIN FUNCTION ................................................................................ 4-64

4.33 SYSTEM CONTROL BLOCK DIAGRAM (VHS) ....................................... 4-65

4.34 AUDIO BLOCK DIAGRAM ........................................................................ 4-67

4.35 VIDEO BLOCK DIAGRAM(VHS) .............................................................. 4-69

4.36 VIDEO/AUDIO BLOCK DIAGRAM (HDD) ................................................ 4-73

5. PARTS LIST

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

5.2 FINAL ASSEMBLY <M2> ............................................................................. 5-2

5.3 MECHANISM ASSEMBLY <M3> .................................................................. 5-4

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

SW REGULATOR BOARD ASSEMBLY <01> ........................................... 5-6

REGULATOR BOARD ASSEMBLY <02> ................................................. 5-7

MAIN BOARD ASSEMBLY <03> .............................................................. 5-8

3D DIGITAL/2M BOARD ASSEMBLY <07> ............................................ 5-15

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

A/C HEAD BOARD ASSEMBLY <12> .................................................... 5-17

DEMOD BOARD ASSEMBLY <14> ........................................................ 5-17

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

ON SCREEN BOARD ASSEMBLY <17> ................................................ 5-18

EJECT SW BOARD ASSEMBLY <27> ................................................... 5-19

SW/DISPLAY BOARD ASSEMBLY <28> ................................................ 5-19

JACK BOARD ASSEMBLY <36> ............................................................ 5-20

LED/SW BOARD ASSEMBLY <47> ....................................................... 5-20

DIGITAL BOARD ASSEMBLY <50> ........................................................ 5-20

LOADING MOTOR BOARD ASSEMBLY <55> ....................................... 5-25

LED BOARD ASSEMBLY <90> .............................................................. 5-25

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