JVC KD-SV3000 Service Manual

SERVICE MANUAL

VCD/CD RECEIVER

4983720036

KD-SV3000

Area Suffix

U --------------------- Other Areas

ATT

FM/AM

CDE

VOL

DOWN

VIDEO CD

ENTER

RET

URN

123

OSD

456

AUDI

7809

TABLE OF CONTENTS

1 Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

2 Disassembly method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

3 Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-24

4 Description of major ICs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-27

No.49837

2003/6

SPECIFICATION

AUDIO AMPLIFIER SECTION

VIDEO SECTION Color system PAL/NTSC

TUNER SECTION Frequency Range FM 87.5 MHz to 108 MHz

CD PLAYER SECTION Type Compact disc player

GENERAL Power Requirement Operating Voltage: DC 14.4 V (11 V to 16 V al-

Maximum Power Output

Continuous Power Output (RMS):

Load Impedance 4 Ω (4 Ω to 8 Ω allowance) Tone Control Rang Bass ±10 dB at 100 Hz

Frequency Response 40 Hz to 20 000 Hz Signal-to-Noise Ratio 70 dB Line-Out Level/Impedance 2.0 V/20 kΩ load (full scale) Output Impedance 1 kΩ

Video output (composite) 1Vp-p/75Ω

[FM Tuner] Usable Sensitivity 11.3 dBf (1.0 µV/75 Ω)

[AM Tuner] Sensitivity 20 µV

Signal Detection System Non-contact optical pickup (semiconductor la-

Number of channels 2 channels (stereo) Frequency Response 5 Hz to 20 000 Hz Dynamic Range 88 dB Signal-to-Noise Ratio 90 dB Wow and Flutter Less than measurable limit MP3 decoding format MPEG1 Audio Layer 3 Max. Bit Rate 320 Kbps

Grounding System Negative ground Allowable Operating Temperature 0ºC to +40ºC Dimensions

(W × H × D) Mass (approx.) 1.3 kg (excluding accessories)

Front 50 W per channel Rear 50 W per channel Front 19 W per channel into 4 Ω 40 Hz to 20 000 Hz

at no more than 0.8% total harmonic distortion.

Rear 19 W per channel into 4 Ω 40 Hz to 20 000 Hz

at no more than 0.8% total harmonic distortion.

Treble ±10 dB at 10 kHz

AM 531 kHz to 1 602 kHz

50 dB Quieting Sensitivity 16.3 dBf (1.8 µV/75 Ω) Alternate Channel Selectivity (400 kHz) 65 dB Frequency Response 40 Hz to 15 000 Hz Stereo Separation 35 dB Capture Ratio 1.5 dB

Selectivity 35 dB

ser)

lowance)

Installation Size (approx.) 182 mm × 52 mm × 150 mm Panel Size (approx.) 188 mm × 58 mm × 11 mm

Design and specifications are subject to change without notice.

1-2 (No.49837)

1.1 Safety Precautions

SECTION 1

Precautions

Burrs formed during molding may be left over on some parts of the chassis. Therefore, pay attention to such burrs in the case of preforming repair of this system.

Please use enough caution not to see the beam directly or touch it in case of an adjustment or operation check.

(No.49837)1-3

1.2 Preventing static electricity

Electrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged, can destroy the laser diode in the traverse unit (optical pickup). Take care to prevent this when performing repairs.

1.2.1 Grounding to prevent damage by static electricity

Static electricity in the work area can destroy the optical pickup (laser dio de) in devices such as CD players. Be careful to use proper grounding in the area where repairs are being performed.

(1) Ground the workbench

Ground the workbench by laying conductive material (such as a conductive sh eet) or an iron plate over it before placing the traverse unit (optical pickup) on it.

(2) Ground yourself

Use an anti-static wrist strap to release any static electricity built up in your body.

(caption) Anti-static wrist strap

Conductive material (conductive sheet) or iron plate

(3) Handli ng the optical pickup

• In order to ma intain quality during transport and be fore installation, both sides of the laser diode on the re placement optical pickup are shorted. After replacement, return the shorted parts to their original condition. (Refer to the text.)

• Do not use a tester to check the condition of the laser diode in the optical pickup. The tester's internal power source can easily destroy the laser diode.

1.3 Handling the traverse unit (optical pickup)

(1) Do not subject the trav erse unit (optical pickup) to strong shocks, as it is a sensitive, complex unit. (2) Cut off the shorted part of the flexible cable using nippers, etc. after replacing the optical pickup. For specific details, refer to the

replacement procedure in the text. Remove the anti-static pin when replacing the traverse unit. Be careful not to take too long a

time when attaching it to the connector. (3) Handle the flexible cable carefully as it may break when subjected to strong force. (4) It is not possible to adju st the semi-fixed resistor that adjusts the laser power. Do not turn it.

1.4 Attention when traverse unit is decomposed *Please refer to "Disassembly method" in the text for the CD pickup unit.

• Apply solder to the short land before the flexible wire is disconnected from the connector on the CD pickup unit. (If the flexible wire is disconnected without applying solder, the CD pickup may be destroyed by static electricity.)

• In the assembly, be sure to remove solder from the short land after connecting the flexible wire.

Short-circuit point

(Soldering)

Flexible wire

1-4 (No.49837)

Short-circuit point

Pickup

SECTION 2

Disassembly method

2.1 Main body

2.1.1 Removing the front panel assembly (See Fig.1)

(1) Push the rel ease button in the lower right pa rt of the front

panel assembly and remove the front panel assembly.

2.1.2 Removing the bottom cover (See Fig.2)

(1) Turn the main body up side down. (2) Insert a screwdriver under the joints to release the two

joints a on th e left side, two joints b on the right side and joint c on the back side of the main body, then remove the bottom cover from the main body.

CAUTION:

When releasing the joints using a screwdriver, do not damage the main board.

Joint a

Front panel assembly

Release button

Fig.1

Bottom cover

Joint b

2.1.3 Removing the front chassis assembly (See Fig.3)

• Prior to performing the following procedures, remove the front

panel assembly and bottom cover. (1) Remove the screw A on the both sides of the main body. (2) Release the two joints d and two joints e on the both sides

of the main body, then remove the front chassis assembly toward the front.

Joint a

Joint c

Fig.2

Joint d Joint e

Joint d

Front chassis

Fig.3

Joint e

Joint b

(No.49837)1-5

2.1.4 Removing the heat sink (See Fig.4)

• Prior to performing the follo wing procedure, remove the front

panel assembly as required. (1) Remove the two screws B and two screws C attaching the

heat sink on the left side of the main body, and remove the heat sink.

2.1.5 Removing the rear bracket (See Fig.5)

• Prior to performing the following procedure, remove the bottom

cover. (1) Remove th e th ree screws D, screw E and six screws F at-

taching the rear bracket on the back side of the main body.

(2) Remove the rear bracket.

Reference:

During reassembly, before fixing the rear bracket onto the main body, insert the video out cable into the slot.

Heat sink

Fig.4

Rear bracket

2.1.6 Removing the main board (See Fig.6)

• Prior to performing the follo wing procedure, remove the front

panel assembly, front chassis assembly, heat sink, bottom cover and rear bracket. (1) Remove the two screws G attaching the main board. (2) Disconnect the connector CN501 and remove the main

board.

CN501

Insert the video out cable into the slot.

Fig.5

Main board assembly

Fig.6

1-6 (No.49837)

2.1.7 Removing the VCD/CD mechanism board

(See Fig. 7)

• Prior to performing the followin g procedure, remove the front

panel assembly, front chassis assembly, heat sink, bottom cover, rear bracket and main board. (1) Remove th e five screws H attaching the VCD/CD mecha-

nism board.

(2) Disconnect the card wire from the connector CN601 on the

VCD/CD mechanism board.

(3) Move the VCD/CD mechanism board in the direction of the

arrow to release it from the joint f.

Joint f

CN601

Card wire

2.1.8 Removing the CD mechanism assembly

(See Fig. 8)

• Prior to performing the followin g procedure, remove the front

panel assembly, front chassis assembly, heat sink, bottom cover, rear bracket, main board and VCD/CD mechanism board. (1) Remove the three screws J attaching the top chassis. (2) Take out the CD mechan ism as sembly.

VCD/CD mechanism board

CD mechanism assembly

Top chassis

Fig.7

Top chassis

Fig.8

(No.49837)1-7

2.1.9 Removing the front board (See Figs.9 to 11)

• Prior to performing the follo wing procedure, remove the front

panel assembly. (1) Remove the four screws K on the back side of the front

panel assembly. (See Fig.9.) (2) Release the thirteen joints g. (See Fig.10.) (3) Release the joint h and take out the front board. (See

Fig.11.)

Fig.9

Joints g Joints g

Joints g

Front board

Joints g

Fig.10

Joint h

Joints g

Front panel assembly

Fig.11

1-8 (No.49837)

2.2 CD Mechanism section

2.2.1 Removing the top cover (See Figs.1 and 2)

(1) Remove the four screws A on the both side of the body. (2) Lift the front side of the top cover an d move the top cover

backward to release the two joints a.

Top cover

Joints a

Fig.1

Fig.2

Top cover

(No.49837)1-9

2.2.2 Removing the connector board (See Figs.3 to 5)

CAUTION:

Before disconnecting the flexible wire from the pickup, solder the short-circuit point on the pickup. No observance of this instruction may cause damage of the pickup. (1) Remove the screw B fixing the connector board. (2) Solder the short-circuit point on the pickup. (3) Disconnect the flexible wire from the pickup. (4) Move th e connector board in the direction of the arrow to

release the two joints b.

(5) Unsolder the wires on the connector board if necessary.

CAUTION:

Unsolder the short-circuit point after reassembling.

Connector board

Flexible wire

Wires

Joints b

Short-circuit point

Fig.3

Short-circuit point

(Soldering)

Pickup

Flexible wire

Frame

Pickup

Fig.4

Connector board

Fig.5

1-10 (No.49837)

2.2.3 Removing the DET switch

(See Figs.6 and 7)

(1) Exten d the two tabs c of the feed sw. hol der and pull out

the switch.

(2) Unsolder the DET switch wire if necessary.

DET

switch

Connector

board

Pickup

Fig.6

DET switch

Tab c

DET switch wire

Feed sw. holder

Fig.7

(No.49837)1-11

2.2.4 Removing the chassis unit

(See Figs.8 and 9)

• Prior to performing the following procedure, remove the top

cover and connector board. (1) Remove the two suspension springs (L) and (R) attaching

the chassis unit to the frame.

CAUTION:

• The shape of the suspension spring (L) and (R) are different. Handle them with care.

• When reassembling, make sure that the three shafts on the underside of the chassis unit are inserted to the dampers certainly.

Suspension spring (R)

Chassis unit

Suspension spring (L)

Frame

Suspension spring (R)

Chassis unit

Shafts

Damper

Suspension spring (L)

Fig.8

Shaft

Dampe

Frame

Fig.9

1-12 (No.49837)

2.2.5 Removing the clamper assembly (See Figs.10 and 11)

• Prior to performi ng the following procedure, remove the top

cover. (1) Remove the clamper arm spring. (2) Move the clamper assembly in the direction of the arrow to

release the two joints d.

Clamper arm spring

Joint d

Clamper assembly

Fig.10

Clamper arm spring

Chassis rivet assembly

Joint d

Clamper assembly

Chassis rivet assembly

Joint d

Fig.11

(No.49837)1-13

2.2.6 Removing the loading / feed motor assembly (See Figs.12 and 13)

• Prior to performing the following procedure, remove the top

cover, connector board and chassis unit. (1) Remove the screw C and move the loading / feed motor as-

sembly in the direction of the arrow to remove it from the chassis rivet assembly.

(2) Disconnect the wire from the loading / feed motor assembly

if necessary.

CAUTION:

When reassembling, connect the wire from the loadin g / feed motor assembly to the flame as shown in Fig.12.

Loading / feed motor assembly

Fig.12

Loading / feed motor assembly

Fig.13

1-14 (No.49837)

2.2.7 Removing the pickup unit

(See Figs.14 to 18)

• Prior to performi ng the following procedure, remove the top

cover, connector board and chassis unit. (1) Remove the screw D and pull out the pu. shaft holder from

the pu. shaft. (2) Remove the screw E attaching the feed sw. holder. (3) Move the part e of the pickup unit upward with the pu. shaft

and the feed sw. holder, then release the joint f of the feed

sw. holder in the direction of the arrow. The joint g of the

pickup unit and the feed rack is released, and the feed sw.

holder comes off. (4) Remove the pu. shaft from the pickup unit. (5) Remove the screw F attaching the feed rack to the pickup

unit.

2.2.8 Reattaching the pickup unit (See Figs.14 to 17)

(1) Reattach the feed rack to the pickup unit using the screw F. (2) Reattach the feed sw. holder to the feed rack while setting

the joint g to the slot of the feed rack and setting the joint f of the feed rack to the switch of the feed sw. holder correctly.

(3) As the feed sw. holder is temporarily attached to the pickup

unit, set to the gear of the joint g and to the bending part of the chassis (joint h) at a time.

CAUTION:

Make sure that the part i on the underside of the feed rack is certainly inserted to the slot j of the change lock

lever. (4) Reattach th e feed sw. holder using the screw E. (5) Reattach th e pu. shaft to the pickup unit. Reatta ch the pu.

shaft holder to the pu. shaft using the screw D.

Part e

Joint g

Feed sw. holder

Feed rack

Part i

Slot j

Fig.15

Pu. shaft

Pickup unit

Joint f

Joint h

Fig.16

Feed rack

Pickup unit

Feed sw. holder

Pu. shaft holde

Joint f

Pu. shaft

Pu. shaft holder

Feed sw. holder

Pickup unit

Fig.14

Part e

Joint g

Pickup unit

Feed rack

Fig.17

Pickup unit

Joint g

Joint f

Feed sw. holder

Fig.18

(No.49837)1-15

+ 33 hidden pages