JVC HMDH30000U - Service Manual Immediate Download

SERVICE MANUAL

No. 82894

August 2001

HM-DH30000U

SPECIFICATIONS

D-VHS DIGITAL RECORDER

Printed in Japan

This service manual is printed on 100% recycled paper.

HM-DH30000U

No.

82894

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

MTP

NTSC

REC LINK

POWER

TIMER

STOP/EJECT

PULL-OPEN

CANCEL

TIMER

START

STOP

DATE

PLAY

REW

BACK

REC

STOP

PAUSE

POWER

TV/VCR

C. RESET

DBS

. , ?

ABC

DEF

GHI

JKL

MNO

PQRS

TUV

WXYZ

DAILY(M-F)

AUX

WEEKLY

PROG.

CHECK

PROG.

HS/STD/LS3

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

GENERAL

Power requirement

: AC 120 V`, 60 Hz

Power consumption

Power on

: 55 W

Power off

: 18 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)

: 435 mm x 105 mm x 383 mm

(17-3/16" x 4-3/16" x 15-1/8")

Weight

: 5.7 kg (12.6 lbs)

Maximum recording time

D-VHS (HS)

: 210 min. with DF-420 video cassette

D-VHS (STD)

: 420 min. with DF-420 video cassette

D-VHS (LS3)

: 1260 min. with DF-420 video cassette

S-VHS/VHS (SP)

: 210 min. with ST-210 video cassette

S-VHS/VHS (EP)

: 630 min. with ST-210 video cassette

VIDEO/AUDIO (D-VHS)

Video format

: MPEG2 standard

Audio format

: Encode

MPEG1 Layer2

Decode MPEG1 Layer2

Dolby Digital

Track composition

Tape speed

: 33.4 mm/sec (HS mode)

16.67 mm/sec (STD mode)

5.55 mm/sec (LS3 mode)

Head azimuth

: ±30 deg

Drum rotation

: 1800 rpm

Tracking system

: CTL track system

Recording specification

Main data input rate

: 28.2 Mbps (HS mode)

14.1 Mbps (STD mode)

4.7 Mbps (LS3 mode)

Interface

: IEEE1394 compliant

DTCP digital copy protection compatible

VIDEO/AUDIO (S-VHS/VHS)

Format

: S-VHS/VHS NTSC standard

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

Frequency range

Normal audio

: 70 Hz to 10,000 Hz

Hi-Fi audio

: 20 Hz to 20,000 Hz

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/24 programs

Memory backup time

: Approx. 60 min.

CONNECTORS

Input/Output

: i.LINK IN/OUT, DV IN x 2 (4-pin, S200)

RCA connectors (IN x 3, OUT x 2)

S-video connectors (IN x 3, OUT x 2)

Component video OUT (Y, PB/CB, PR/CR) x 1

Digital OUT (optical) x 1

ACCESSORIES

Provided accessories

: Infrared remote control unit, "AA" battery x 2,

Audio cable, RF cable (F-type),

S-video cable (4-pin), Controller

Manufactured under license from Dolby Laboratories.

"Dolby", "Pro Logic", and the double-D symbol are trademarks of Dolby

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 ............................................................................ 1-5

1.4.1 How to set the "Service position" ........................................... 1-5

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" 1-5

1.5 Mechanism service mode ............................................................ 1-6

1.5.1 How to set the "Mechanism service mode" ............................ 1-6

1.6 Jig RCU mode ............................................................................. 1-6

1.6.1 Setting the Jig RCU mode ..................................................... 1-6

1.6.2 Setting the User RCU mode .................................................. 1-6

1.7 Opening on the chassis ................................................................ 1-6

1.8 Emergency display function ......................................................... 1-7

1.8.1 Displaying the EMG information ............................................. 1-7

1.8.2 Clearing the EMG history ....................................................... 1-7

1.8.3 EMG content description ........................................................ 1-8

1.8.4 EMG detail information <1> ................................................... 1-9

1.8.5 EMG detail information <2> ................................................. 1-10

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

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 D-VHS switching point ........................................................... 3-2

3.2.3 Slow tracking preset ............................................................... 3-2

TABLE OF CONTENTS

Section

Title

Page

Section

Title

Page

3.3 Video circuit .................................................................................. 3-3

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

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

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

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

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 Demodulator circuit ...................................................................... 3-5

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

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

3.5.3 Stereo filter ............................................................................. 3-5

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

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

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

3.6 Digital circuit ................................................................................. 3-6

3.6.1 D-VHS REC level ................................................................... 3-6

3.6.2 PLL f0 ..................................................................................... 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 REGULATOR AND SUB REGULATOR SCHEMATIC DIAGRAMS ...... 4-5

4.3 MAIN (VIDEO/AUDIO) SCHEMATIC DIAGRAM .......................... 4-7

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

4.5 MAIN (TUNER/DEMOD) SCHEMATIC DIAGRAM ..................... 4-11

4.6 MAIN (AUDIO I/O) SCHEMATIC DIAGRAM .............................. 4-13

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

4.8 MAIN (MAIN-TERMINAL) SCHEMATIC DIAGRAM ................... 4-17

4.9 3D DIGITAL/4M SCHEMATIC DIAGRAM ................................... 4-19

4.10 TERMINAL-NTSC SCHEMATIC DIAGRAM ............................. 4-21

4.11 S-SUB SCHEMATIC DIAGRAM ............................................... 4-23

4.12 DISPLAY, REC SAFETY/D.CASS SW AND

JACK SCHEMATIC DIAGRAMS .............................................. 4-25

4.13 D-PRE/REC SCHEMATIC DIAGRAM ...................................... 4-27

4.14 DIGITAL(HOST) SCHEMATIC DIAGRAM ................................ 4-29

4.15 DIGITAL(DMAIN) SCHEMATIC DIAGRAM .............................. 4-31

4.16 DIGITAL(D-VHS IF) SCHEMATIC DIAGRAM .......................... 4-33

4.17 DIGITAL(DVX) SCHEMATIC DIAGRAM ................................... 4-35

4.18 DIGITAL(VIDEO IF) SCHEMATIC DIAGRAM .......................... 4-37

4.19 DIGITAL(HD DEC) SCHEMATIC DIAGRAM ............................ 4-39

4.20 DIGITAL(LAPRAS) SCHEMATIC DIAGRAM ............................ 4-41

4.21 DIGITAL(DSP) SCHEMATIC DIAGRAM .................................. 4-43

4.22 DIGITAL(AUDIO AD/DA) SCHEMATIC DIAGRAM ................... 4-45

4.23 DIGITAL(DECRIPTER) SCHEMATIC DIAGRAM ..................... 4-47

4.24 REGULATOR AND SUB REGULATOR CIRCUIT BOARDS .... 4-49

4.25 3D DIGITAL/4M AND S-SUB CIRCUIT BOARDS .................... 4-51

4.26 TERMINAL CIRCUIT BOARD .................................................. 4-52

4.27 DISPLAY, REC SAFETY AND JACK CIRCUIT BOARDS ........ 4-53

4.28 D-PRE/REC CIRCUIT BOARD ................................................ 4-55

4.29 DIGITAL CIRCUIT BOARD ...................................................... 4-57

4.30 MAIN CIRCUIT BOARD ........................................................... 4-61

4.31 VOLTAGE CHARTS .................................................................. 4-64

4.32 FDP GRID ASSIGNMENT AND ANODE CONNECTION ........ 4-65

4.33 REMOTE CONTROLLER SCHEMATIC DIAGRAM ................. 3-66

4.34 WAVEFORMS .......................................................................... 4-67

4.35 CPU PIN FUNCTION ............................................................... 4-68

4.36 SYSTEM CONTROL BLOCK DIAGRAM ................................. 4-69

4.37 AUDIO BLOCK DIAGRAM ....................................................... 4-71

4.38 VIDEO BLOCK DIAGRAM ....................................................... 4-73

4.39 D-VHS BLOCK DIAGRAM ....................................................... 4-77

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

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

SUB REG BOARD ASSEMBLY <02> .............................................. 5-7

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

3D DIGITAL/4M BOARD ASSEMBLY <05> ................................... 5-14

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

A/C HEAD BOARD ASSEMBLY <12> ........................................... 5-16

S-SUB BOARD ASSEMBLY <15> ................................................. 5-16

DISPLAY BOARD ASSEMBLY <28> .............................................. 5-17

REC SAFETY BOARD ASSEMBLY <32> ...................................... 5-18

JACK BOARD ASSEMBLY <36> ................................................... 5-18

D-PRE/REC BOARD ASSEMBLY <43> ......................................... 5-18

DIGITAL BOARD ASSEMBLY <50> ............................................... 5-22

LOADING MOTOR BOARD ASSEMBLY <55> .............................. 5-32

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

1-1

[1]

Top cover,

D1 2(S1a), 2(S1b), (S1c)

Bracket

2(S1d)

[2]

Front panel assembly

D2 CN8201(WR2a),

2(S2a), 4(L2a), 2(L2b), <Note 2b>

3(L2c)

[3]

SW.REG board

D3 CN5302(WR3a),

assembly

CN5502(WR3b),

CN5504(WR3c),

CN5303(WR3d),

CN5503(WR3e),

2(S3a)

[4]

Digital board assembly D4 CN601(WR4a),

CN603(WR4b),

CN8803(WR4c),

CN9801(WR4d),

CN8002(WR4e),

2(S4a), (S4b),

Earth plate

[5]

D-PRE/REC board

D5 (S5a), L5a(WR5a), <Note 2a>

assembly

Shield case(PRE),

CN606(WR5b),

CN3011

[6]

Drum assembly,

D6 CON1(WR6a),

CN1(WR6b),

(S6a), (S6b), (S6c)

(Inertia plate),

4(L6a)

(Roller arm assembly),

(P6a), (L6b)

(Cleaner assembly)

(L6c)

[7]

Mechanism assembly D7 CN1(WR7a), (S7a), <Note 2a>

(S7b), (S7c), (S7d), <Note 7a>

S7e(WR7b), 2(L7a)

[8]

REC safety board

D8 (S8a)

assembly,

Display board assembly,

CN7002(WR8a),

4(L8a)

Jack board assembly

CN7191(WR8b)

[9]

Main board assembly

D9 2(S9a)

[10] Bottom cover,

D10

(Foot(2)),

4(L10a)

(Foot assembly)

4(L10b)

(S10a), 2(S10b),

4(L10c), 3(L10d)

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

SW.REG board assembly

Digital board assembly

D-PRE/REC board assembly

Drum assembly

Mechanism assembly

REC safety board assembly,

Display board assembly,

Jack board assembly

Main board assembly

Bottom cover

[1]

[2]

[3]

[4]

[5]

[6]

[7]

[8]

[9]

[10]

Step/

LocNo.

Part Name

Fig.

No.

Point

Note

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

(1)

(2)

(3)

(4)

(5)

Step/

LocNo.

Part Name

Fig.

No.

Point

Note

[1]

Top cover,

D1 4(S1a),(S1b),3(L1a),

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**).

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