JVC HR-J3008 Service Manual

SERVICE MANUAL

VIDEO CASSETTE RECORDER

HR-J3008UM/J4008UM

Regarding service information other than these sections, refer to the HR-A37U service manual (No.82836). Also, be sure to note important safety precautions provided in the service manual.

SPECIFICATIONS

GENERAL

Power requirement : AC 110 V – 220 Vd, 50 Hz/60 Hz Power consumption

Power on : 14 W Power off : 2.0 W

Temperature

Operating : 5°C to 40°C Storage : –20°C to 60°C

Operating position : Horizontal only Dimensions (W x H x D) : 360 mm x 94 mm x 247 mm Weight : 3.0 kg Format : VHS NTSC standard Maximum recording time

SP : 210 min. with ST-210 video cassette EP : 630 min. with ST-210 video cassette

VIDEO/AUDIO

Signal system : NTSC-type color signal and EIA

Recording/Playback system

Signal-to-noise ratio : 45 dB Horizontal resolution : 230 lines Frequency range : 70 Hz to 10,000 Hz Input/Output : RCA connectors (IN x 1, OUT x 1)

(The specifications shown pertain specifically to the model HR-J4008UM)

monochrome signal, 525 lines/ 60 fields

: DA-4 (Double Azimuth) head helical

scan system

TUNER

Tuning system : Frequency-synthesized tuner Channel coverage

VHF : Channels 2–13 UHF : Channels 14–69 CATV : 113 Channels

RF output : Channel 3 or 4 (switchable; preset to

Channel 3 when shipped) 75 ohms, unbalanced

TIMER

Clock reference : Quartz Program capacity : 1-year programmable timer/

8 programs

Memory backup time : Approx. 6 months

Estimated figure based on supplied fresh battery; actual performance may differ.

ACCESSORIES

Provided accessories : RF cable (F-type),

Lithium battery CR2025, Infrared remote control unit, “AA” battery x 2, Conversion plug

Specifications shown are for SP mode unless specified otherwise. E. & O.E. Design and specifications subject to change without notice.

No.82852

April 2001

Section Title Page Section Title Page

DIFFERENT TABLE ........................................................................... 1 to 2

2. MECHANISM ADJUSTMENT

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

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

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

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

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

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

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

2.2.1Before starting disassembling

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

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

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

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

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

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

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

2.2.9Pole 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

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)

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),

(Phase matching between mechanical parts) .........................2-6

and coupling gear .................................................................2-10

and loading arm gear shaft ................................................... 2-12

2.2.21 Tension brake assembly, reel disk (supply side)

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

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

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

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

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

2.3.5Tension pole position ..................................................................2-18

4. CHARTS AND DIAGRAMS

4.1 MAIN (SYSCOM) AND LT BATTERY

4.2 MAIN CIRCUIT BOARD

4.3 MAIN CIRCUIT BOARD

5. PARTS LIST

5.1 PACKING AND ACCESSORY ASSEMBL Y <M1> ........................ 5-1

5.2 FINAL ASSEMBL Y <M2>.............................................................. 5-2

5.3 MECHANISM ASSEMBLY <M4>.................................................. 5-4

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

reel disk (take-up side) and

main brake assembly (supply side).......................................2-13

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

SCHEMATIC DIAGRAMS.......................................................4-1

(MAIN PWB LPB10130-001C) [HR-J4008UM].............................4-3

(MAIN PWB LPB10130-001D) [HR-J3008UM].............................4-5

MAIN BOARD ASSEMBLY <03> ..................................................5-6

A/C HEAD BOARD ASSEMBLY <12>. .......................................5-10

LOADING MOTOR BOARD ASSEMBLY <55> ..........................5-10

LT BATTERY BOARD ASSEMBLY <93>

[HR-J4008UM] .......................................................................510

The following table indicate main different points between models HR-A37U,HR-J3008UM and HR-J4008UM.

ITEM

MODEL

HR-A37U

HR-J3008UM

HR-J4008UM

POWER VOLTAGE 120V, 60HZ 110-220V, 50/60HZ POWER PLUG UL, CSA SASO COSMETIC/COLOR MOLD-DARK GRAY PAINT-Pure SILVER RCU TYPE / COLOR U1 / MOLD BLACK E1 / PAINT SILVER INSTRUCTION / LANGUAGE 1 SHEET / ENG YES / SPA YES / SPA, ENG

PLUG ADAPTER NOT USED SASO CEE LITHIUM BATTERY NOT USED CR2025 HEAD CLEANER NOT USED USED SHUTTLE SERCH(LATCH) SP

X7, EPX21 SPX7, EPX21(X21)

B.E.S.T. PICTURE AUTO PICTURE A.V. CALIBRATION AUTO CH PRESET USED (P&P) USED BACKUP TIME NOT USED 6 MONTHS(LI BATT.) TIMER PROGRAM BACKUP

PERMANENT PROGRAM

NOT USED SUMMER TIME ADJUST USED NOT USED AUTO CLOCK / JUST CLOCK USED NOT USED REC RESUME NOT USED USED LANGUAGE[INITIAL] [ENG], SPA, FRE [SPA], ENG

Note: Mark is same as left.

The following table indicate main different points between models HR-A37U,HR-J3008UM and HR-J4008UM. PACKING AND ACCESSORY ASSEMBLY <M1>

REF NO.

ITEM

MODEL

HR-A37U

HR-J3008UM

HR-J4008UM

301 PACKING CASE LP30836-006A LP30836-017A LP30836-015B 306 REMOTE CONTROL UNIT LP20878-001A 306A COVER(BATTERY) LP40610-001A

LP20878-002A LP40610-002A

! 309 LITHIUM BATTERY ––– ––– PECA0903 ! 310 INST. BOOK(EN) LPT0497-001A ––– LPT0533-001A ! 310 INST. BOOK(SP) ––– LPT0532-001A LPT0533-002A

311 POLY BAG ––– QPC02503530P

! 313 CONVERSION PLUG ––– ––– PEMC1012

317 REGIST. CARD BT-51020-2 ––– ––– 320 CONNECTION SHEET ––– PU36560-2

Note: Mark ––– is not used.

Mark is same as left.

FINAL ASSEMBL Y<M2>

REF NO.

ITEM

MODEL

HR-A37U

HR-J3008UM

HR-J4008UM

! 501 FRONT PANELASSEMBLY * LP10348-004D LP10348-009F LP10348-008F

501A CASSETTE DOOR * LP20977-002C LP20977-008C 501C DISPLAY WINDOW LP20976-004A LP20976-009A LP20976-008A

! 502 TOP COVER LP10352-002A LP10352-008A

503 SCREW,X2,TOP COVER(SIDE) QYTDSF3010M QYTDSF3010R

! 511 BOTTOM CHASSIS * LP10350-003D LP10350-004D LP10350-005D ! 517 POWER CORD ––– ––– QMP73J0-170

518 CLEANER ASSEMBLY ––– ––– LP40369-001D 518A CLEANER ROLLER ––– ––– PQ46418-1-2 518B CLEANER ––– ––– PQ46419-1-2 518C CLEANER ARM ––– ––– LP30407-001D 520 CAP ––– ––– LP30336-001A 531 SCREW,REAR ––– ––– QYTDSF3010M 532 SCREW,TERMINAL BOARD

MAIN BOARD ASSEMBLY<03>

REF

NO.

PW1 MAIN BOARD ASSEMBLY * LPA10130-02D1

LITHIUM BATTERY BOARD ASSEMBLY<93>

REF

NO.

! PW4

ITEM

LITHIUM BATTERY BOARD ASSEMBLY

MODEL

––– ––– QYTDSF3010Z

HR-A37U

––– ––– LPA10130-01A4

HR-J3008UM

HR-J4008UM

LPA10130-05B1

HR-J4008UM

Note : Mark ––– is not used.

Mark Mark * reference model was also changed.

is same as left.

SECTION 2

MECHANISM ADJUSTMENT

2.1 Before starting repair and adjustment

2.1.1 Precautions

(1) Unplug the power cord plug of the VCR before using your

soldering iron.

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

wires when plugging and unplugging the connectors.

(3) Do not randomly handle the parts without identifying

where the trouble is.

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

ing the repair work.

(5) When reattaching the front panel assembly, make sure

that the door opener of the cassette holder assembly is lowered in position prior to the reinstallation. (See SECTION 1 DISASSEMBLY.)

(6) 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). (See SECTION 1 DISASSEMBLY.)

Loading motor

2.1.2 Checking for proper mechanical operations

Enter the mechanism service mode when you want to operate the mechanism when no cassette is loaded. (See SECTION 1 DISASSEMBLY.)

2.1.3 Manually removing the cassette tape

1. In case of electrical failures

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

(1) Unplug the power cord plug from the power outlet. (2) Refer to the disassembly procedure and perform the dis-

assembly of the major parts before removing the drum assembly.

(3) Unload the pole base assembly by manually turning the

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

(4) Bring the pole base assembly to a pause when it reaches

the position where it is hidden behind the cassette tape.

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

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

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

tape and the cassette lid.

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

pletes removal of the cassette tape.

Note:

• For the disassembly procedure of the major parts and details of the precautions to be taken, see “SECTION 1 DISASSEMBLY”.

Pole base assembly

Fig. 2-1-3a

(C)

(A)

(B)

Press

Fig. 2-1-3b

2-1

2. In case of mechanical failure

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

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

panel assembly and others so that the mechanism assembly is visible. (See SECTION 1 DASASSEMBLY.)

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

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

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

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

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

2.1.3-1(5), remove the top guide.

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

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

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

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

Pole base assembly (take-up side)

2.1.4 Jigs and tools required for adjustment

Roller driver

PTU94002

Back tension cassette gauge

PUJ48076-2

Alignment tape

(SP, stairstep, NTSC)

MHP

A/C head positioning tool

PTU94010

Jig RCU

PTU94023B

Alignment tape

(EP, stairstep, NTSC)

MHP-L

Torque gauge

PUJ48075-2

Pole base assembly

(supply side)

Tension arm assembly

Fig. 2-1-3c

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

Guide pole guard

2-2

Pinch roller arm assembly

Press lever assembly

Fig. 2-1-3d

2.1.5 Maintenance and inspection

1. Location of major mechanical parts

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

UV catcher2 (supply and take-up side)

Stator assembly

Full erase head

T26

Pole base assembly

T25

(supply side)

Tension arm

T24

assembly

Adjust pin

T23

Tension brake

T22

assembly

T5 T7

Drum assembly

Head base

A/C head

Loading motor

Guide pole guard

Pinch roller arm

assembly Lid guide

T10

Press lever

T11

assembly Guide arm

T12

assembly

Reel disk

T13

(take-up side) Sub brake assembly

T14

(take-up side)

Belt

B22

(loading motor)

B21

Control cam

B20

B19

Cassette gear

B18

Worm gear

Brake lever

Rec safety lever

Reel disk

T20

(supply side)

Main brake assembly (supply side)

Idler lever

T17T19T21

Idler arm assembly

T16T18

Pole base assembly (take-up side)

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

Capstan motor

Capstan brake assembly

B3 B5

Belt (capstan)

Loading arm gear (take-up side)

Loading arm gear (supply side)

Main brake assembly

T15

(take-up side)

Plate

(supply side)

Control

bracket1

Control plate

Tension arm

bearing

Link lever

B17

Rotary encoder guide

B16

Rotary encoder

B15

B14

Direct gear

B13

Change lever assembly

B12

B10

Clutch unit

Take-up head

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

Take-up lever

B11

2-3

Guide rail Roller cam assembly

L2L1

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

Opener guide

Door

opener

Drive gear

Cassette housing bracket

Limit gear

Loading motor

Worm gear

Belt (loading motor)

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

2. Cleaning

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

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

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

Note:

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

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

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

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

pletely dry before using the video tape.

3. Lubrication

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

Note:

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

4. Suggested servicing schedule for main components

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

System Parts Name

Upper drum assembly A/C head Lower drum assembly Pinch roller arm assembly Full erase head Tension arm assembly Capstan motor (Shaft) Guide arm assembly Capstan motor Capstan brake assembly Main brake assembly Belt (Capstan) Belt (Loading motor) Loading motor Clutch unit Worm gear Control plate Brush Tension brake assembly

Other Drive Tape transport

Rotary encoder

: Cleaning

: Inspection or replacement if necessary

Operation Hours

~1000H ~2000H

¤R R ¤R ¤R

¤¤R ¤¤ ¤¤ ¤¤ ¤¤ ¤¤

R R R

R R R R R

¤R ¤R

Table 2-1-5a

5. Disassembling procedure table

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

2-4

R4 R1 R3 T9 T12 T11 B15 B12 B14 B13 B17 B21 B7 B8 B5 B4 B11 T14 T15 T13 T22 T24 T18 B1 9

Symbols and numbers

Removal parts

(Reference items) Replacement parts

Symbols and numbers

2.2.3 Guide rail T 1

2.2.3 Roller cam assembly T 1

2.2.3 Cassette housing bracket T 1

2.2.3 Opener guide T 2

2.2.3 Door opener T 3

2.2.3 Relay gear T 3

2.2.3 Limit gear T 3

2.2.3 Cassette holder assembly T 6

2.2.3 Drive gear T 4

2.2.3 Drive arm T 8

2.2.4 Pinch roller arm assembly T 1

T12

2.2.5 Guide arm assembly T 1

T11

2.2.5 Press lever assembly T 3

2.2.6 A/C head T 1

2.2.7 Loading motor T 1

2.2.8 Capstan motor T/B 1

2.2.9 UV catcher2 T 1

T17

Pole base assembly (take-up side)

2.2.9

T25

Pole base assembly (supply side)

2.2.9

B15

2.2.10 Rotary encoder B 1

B12

2.2.11 Clutch unit B 1

B14

2.2.12 Change lever assembly B 3

B13

2.2.12 Direct gear B 4

2.2.12 Coupling gear B 5

2.2.12 Clutch gear B 6

B17

2.2.13 Link lever B 1

2.2.14 Cassette gear B 2

B18 B20

2.2.14 Control cam B 2

B21

2.2.14 Worm gear B 1

T10

- Lid guide T/B 5

2.2.15Control bracket1 B 1

2.2.15Control plate B 6

B8 B5

2.2.16Loading arm gear (supply side) B 7

Loading arm gear (take-up side)

2.2.16

2.2.16Loading arm gear shaft B 9

2.2.17Take-up lever T/B 7

B11 B10

2.2.17Take-up head T/B 8

2.2.17Control plate guide T/B 8

2.2.18Capstan brake assembly T/B 7

T14

Sub brake assembly(take-up side)

2.2.19

T15

Main brake assembly(take-up side)

2.2.20

T19

Main brake assembly(supply side)

2.2.20

T13

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

T22

2.2.21Tension brake assembly T/B 9

T20

2.2.21Reel disk (supply side) T/B 10

T24

2.2.21Tension arm assembly T/B 10

2.2.21Tension arm bearing T/B 10

T18

2.2.22Idler lever T/B 17

T16

2.2.22Idler arm assembly T/B 18

B19

- Brake lever (

B16

- Rotary encoder guide T/B 19

) T/B 18

L1L1L2

Number of removal steps

Guide rail

Roller cam assembly

Cassette housing bracket

Opener guide

112 12 12

12 3

4 5

5 6

Relay gear

6 7

Front (T)/Back (B) of mechanism

1 2 3 4 5

T/B 2 T/B 2

T/B 15

1 2 3 4

T/B 16

1 2 3 4 5 6 7 8

T/B 9

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

Cassette holder assembly

Drive gear

Table 2-1-5b

Note:

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

1: Uses the standard type mechanism only.

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

) have different types of mecha-

Drive arm

Pinch roller arm assembly

Guide arm assembly

Press lever assembly

UV catcher2

Rotary encoder

Clutch unit

Change lever assembly

Direct gear

1 1

1 2 3 4 5

3 4

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

9 10 11 12 13 14 9 10 11 12 13 14 15

9 10 11 12 13 14 15

9 10 11 12 13 14 15 16 9 10 11 12 13 14 15 16 17 9 10 11 12 13 14 15 16 17 9 10 11 12 13 14 15 16 17 18

Clutch gear

Link lever

Worm gear

Control bracket1

Control plate

Loading arm gear (supply side)

Loading arm gear (take-up side)

1 1

)

(

Take-up lever

Sub brake assembly (take-up side)

Main brake assembly (take-up side)

Reel disk (take-up side)

Tension brake assembly

Tension arm assembly

Idler lever

Brake lever

7 7

9 9 9

2-5

+ 16 hidden pages

JVC HR-J3008 Service Manual

TABLE OF CONTENTS

SECTION 2

2.1 Before starting repair and adjustment

2.1.1 Precautions

2.1.2 Checking for proper mechanical operations

2.1.3 Manually removing the cassette tape

2.1.4 Jigs and tools required for adjustment

2.1.5 Maintenance and inspection