Jvc KD-SV3205-UT, KD-SV3205-UN, KD-SV3205-UH, KD-SV3205-U, KD-SV3204-UI Service Manual

SERVICE MANUAL

VCD/CD RECEIVER

MA25620063

KD-SV3204UI,KD-SV3205U,

KD-SV3205UN,KD-SV3205UT,

KD-SV3205UH

Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)

TABLE OF CONTENTS

1 PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13

No.MA256

2006/3

SPECIFICATION

AUDIO AMPLIFIER SECTION

Maximum Power Output Front 50 W per channel

Rear 50 W per channel

Continuous Power Output (RMS)

Load Impedance 4 Ω (4 Ω to 8 Ω allowance)

Tone Control Range Bass ±10 dB at 100 Hz

Frequency Response 40 Hz to 20 000 Hz

Signal-to-Noise Ratio 70 dB

Line-Out Level/Impedance 2.5 V/20 kΩ load (full scale) Output Impedance 1 kΩ

Other Terminal LINE IN, CD changer

Color system PAL/NTSC

Video output (composite) 1 Vp-p/75 Ω

Frequency Range FM 87.5 MHz to 108.0 MHz

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

AM Tuner Sensitivity 20 µV

Type Compact disc player

Signal Detection System Non-contact optical pickup (semiconductor laser)

Number of Channels 2 channels (stereo)

Frequency Response 5 Hz to 20 000 Hz

Dynamic Range 96 dB

Signal-to-Noise Ratio 98 dB

Wow and Flutter Less than measurable limit

MP3 Decoding Format MPEG1/2 Audio Layer 3

WMA (Windows Media® Audio) Decoding Format Max. Bit Rate: 192 kbps

Power Requirement Operating Voltage:

Grounding System Negative ground

Allowable Operating Temperature 0°C to +40°C Dimensions (W × H × D) Installation Size (approx.) 182 mm × 52 mm × 150 mm

Mass (approx.) 1.4 kg (excluding accessories)

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

VIDEO SECTION

TUNER SECTION

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 30 dB

Selectivity 35 dB

VCD/CD PLAYER SECTION

Max. Bit Rate: 320 kbps

GENERAL

Panel Size (approx.) 188 mm × 58 mm × 11 mm

Design and specifications are subject to change without notice.

1-2 (No.MA256)

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.MA256)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 diode) in devices such as laser products. 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 sheet) 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) Handling the optical pickup

• In order to maintain quality during transport and before installation, both sides of the laser diode on the replacement 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 traverse 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 adjust 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 pickup unit.

• Apply solder to the short land before the flexible wire is disconnected from the connector on the pickup unit. (If the flexible wire is disconnected without applying solder, the 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.MA256)

Pickup

1.5 Important for laser products

1.CLASS 1 LASER PRODUCT

2.DANGER : Invisible laser radiation when open and inter

lock failed or defeated. Avoid direct exposure to beam.

3.CAUTION : There are no serviceable parts inside the

Laser Unit. Do not disassemble the Laser Unit. Replace

the complete Laser Unit if it malfunctions.

4.CAUTION : The CD,MD and DVD player uses invisible

laser radiation and is equipped with safety switches which

prevent emission of radiation when the drawer is open and

the safety interlocks have failed or are defeated. It is

dangerous to defeat the safety switches.

5.CAUTION : If safety switches malfunction, the laser is able

to function.

6.CAUTION : Use of controls, adjustments or performance of

procedures other than those specified here in may result in

hazardous radiation exposure.

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

REPRODUCTION AND POSITION OF LABELS

WARNING LABEL

CAUTION : Visible and Invisible

CLASS 1 LASER PRODUCT

laser radiation when open and interlock failed or defeated. AVOID DIRECT EXPOSURE TO BEAM. (e)

ADVARSEL : Synlig og usynlig laserstråling når maskinen er åben eller interlocken fejeler. Undgå direkte eksponering til stråling. (d)

VARNING : Synlig och osynling laserstrålning när den öppnas och spärren är urkopplad. Betrakta ej strålen. (s)

VARO : Avattaessa ja suojalukitus ohitettuna tai viallisena olet alttiina näkyvälle ja näkymättömälle lasersäteilylle. Vältä säteen kohdistumista suoraan itseesi. (f)

(No.MA256)1-5

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

1-6 (No.MA256)

SECTION 3

DISASSEMBLY

3.1 Main body section

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

Push the detach button in the lower right part of the front panel assembly and remove the front panel assembly.

3.1.2 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 the left side, tow 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.

Note:

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

Front panel assembly

Detach button

Fig.1

Bottom cover

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

• Remove the front panel assembly and bottom cover.

(1) Remove the two screws A on the both sides of the main

body.

(2) Release the one joint d and one joint e on the both sides of

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

Fig.2

Front chassis assembly

Fig.3

(No.MA256)1-7

3.1.4 Removing the side panel (See Fig.4)

Reference:

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

side panel on the left side of the main body.

(2) Remove the side panel from the main body.

3.1.5 Removing the rear bracket (See Fig.5)

• Remove the bottom cover.

(1) Remove the three screws D, one screw D', four screws E

and two screws F attaching the rear bracket on the back side of the main body.

Reference:

When attaching the screw D', attach the wire holder of the VIDEO OUT cable with it as before.

(2) Remove the LINE IN cable in the direction of the arrow from

the slot of the rear bracket.

(3) Remove the rear bracket.

LINE IN cable

Slot

Side panel

Wire holder

Fig.4

VIDEO OUT cable

3.1.6 Removing the main board (See Fig.5 and 6)

• Remove the front panel assembly, bottom cover, front chassis

assembly and side panel. (1) Remove the three screws D and one screw D' attaching the

rear bracket on the back side of the main body. (See Fig.5)

Reference:

When attaching the screw D', attach the wire holder of the DVD OUT cable with it as before.

(2) Remove the two screws G attaching the main board. (See

Fig.6)

(3) Disconnect the connector CN301

the main body and take out the main board with the rear bracket. (See Fig.6)

Reference:

Remove the rear bracket from the main body as required.

on the main board from

CN301

Rear bracket

Fig.5

Main board

1-8 (No.MA256)

Rear bracket

Fig.6

3.1.7 Removing the mechanism control board

(See Fig.7)

• Remove the front panel assembly, bottom cover, front chassis

assembly, side panel and main board. (1) Disconnect the card wire from the connector CN601

mechanism control board.

(2) Remove the five screws H attaching the mechanism con-

trol board on the CD mechanism assembly.

(3) Remove the joint f in the direction of the arrow and take out

the mechanism control board from the CD mechanism assembly.

3.1.8 Removing the CD mechanism assembly

(See Fig.8)

• Remove the front panel assembly, bottom cover, front chassis

assembly, side panel and main board.

Reference:

Remove the mechanism control board as required.

(1) Remove the three screws J attaching the CD mechanism

assembly on the top chassis.

(2) Take out the CD mechanism assembly.

on the

Mechanism control board

Card wire

CD mechanism assembly

Mechanism control board

Fig.7

CN601

CD mechanism assembly

Fig.8

Top chassis

(No.MA256)1-9

3.1.9 Removing the switch board (See Fig.9 to 11)

• 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 fourteen joints g and remove the rear cover.

(See Fig.10)

(3) Release the joint h and take out the switch board from the

front panel assembly. (See Fig.11)

Fig.9

Rear cover

g g

Switch board

Fig.10

Front panel assembly

3.2 CD mechanism section

For the CD mechanism section, please refer CD mechanism manual TN2001-1077 (No.MY001).

1-10 (No.MA256)

Fig.11

SECTION 4

ADJUSTMENT

4.1 Adjustment method

 Test instruments required for adjustment

(1) Digital oscilloscope (100MHz) (2) Electric voltmeter (3) Digital tester (4) Tracking offset meter (5) Test Disc JVC :CTS-1000 (6) Extension cable for check

EXTSH002-22P × 1

 Standard volume position

Balance and Bass &Treble volume : lndication"0" Loudness : OFF

 How to connect the extension cable for adjusting

Caution:

Be sure to attach the heat sink and rear bracket onto the power amplifier IC and regulator IC respectively, before supply the power. If voltage is applied without attaching these parts, the power amplifier IC and regulator IC will be destroyed by heat.

 Standard measuring conditions

Power supply voltage DC14.4V(11 to 16V)

Load impedance 20KΩ(2 Speakers connection)

Output Level Line out 2.0V (Vol. MAX)

 Dummy load

Exclusive dummy load should be used for AM,and FM. For FM dummy load,there is a loss of 6dB between SSG output and antenna input.The loss of 6dB need not be considered since direct reading of figures are applied in this working standard.

EXTSH002-22P

(No.MA256)1-11

4.2 Confirmation method of a microcomputer version

1. Press the [ / I /ATT ] button.

2. Set this set at tuner mode.

3. Keep this state more than 2 seconds while continuing pressing the [BAND] button and [2] button sequentially.

4. It is displayed as follows by a display window.

MA Main micon version

CD CD micon version

CH CH micon version (It is displayed only in changer connection.)

Change each indication with the [SKIP] button.

1-12 (No.MA256)

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