JVC KD-DB711 Bedienungsanleitung

SERVICE MANUAL

2005/3

CD RECEIVER

MA16620053

KD-DB711

TABLE OF CONTENTS

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

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

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

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-26

Area suffix

E ------------ Southern Europe

EX ------------ Northern Europe

EY ------------- Eastern Europe

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SPECIFICATION

• Design and specifications are subject to change without notice.

• Microsoft and Windows Media are either registered trademarks or trademarks of Microsoft Corporation in the United States and/

or other countries.

AUDIO AMPLIFIER SECTION

Maximum Power Output Front 50 W per channel

Rear 50 W per channel

Continuous Power Output (RMS) 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.

Load Impedance 4 Ω(4 Ωto 8 Ωallowance)

Tone Control Range Bass ±10 dB at 100 Hz

Treble ±10 dB at 10 kHz

Frequency Response 40 Hz to 20 000 Hz

Signal-to-Noise Ratio 70 dB

Line-Out Level/Impedance 2 V/20 kΩload (full scale)

Output Impedance 1 kΩ

Other Terminal Steering wheel remote input

TUNER SECTION

Frequency Range FM 87.5 MHz to 108.0 MHz

AM (MW) 522 kHz to 1 620 kHz

(LW) 144 kHz to 279 kHz

FM Tuner Usable Sensitivity 11.2 dBf (1.0 µV/75 Ω)

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

Capture Ratio 1.5 dB

MW Tuner Sensitivity 20 µV

Selectivity 35 dB

LW Tuner Sensitivity 50 µV

DAB Tuner] Sensitivity (Band III) -98 dBm

(L-Band) -96 dBm

Selectivity 40 dB

CD PLAYER SECTION

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

Max. Bit Rate: 320 kbps

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

GENERAL

Power Requirement Operating Voltage DC 14.4 V (11 V to 16 V allowance)

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

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

Mass (approx.) 1.4 kg (excluding accessories)

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SECTION 1

PRECAUTIONS

1.1 Safety 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.

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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 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 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.

(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 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.

(caption)

Anti-static wrist strap

Conductive material

(conductive sheet) or iron plate

Pickup

Short-circuit point

(Soldering)

Flexible wire

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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.

REPRODUCTION AND POSITION OF LABELS

Please use enough caution not to

see the beam directly or touch it

in case of an adjustment or operation

check.

WARNING LABEL

CAUTION : Visible and Invisible

laser radiation when open and

interlock failed or defeated.

AVOID DIRECT EXPOSURE TO

BEAM. (e)

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)

ADVARSEL : Synlig og usynlig

laserstråling når maskinen er

åben eller interlocken fejeler.

Undgå direkte eksponering til

stråling. (d)

CLASS 1

LASER PRODUCT

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SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

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SECTION 3

DISASSEMBLY

3.1 Main body section

3.1.1 Removing the front panel assembly

(See Fig.1)

(1) Push the detach button in the lower right part of the front

panel assembly and remove the front panel assembly.

Fig.1

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 aon the left side, two joints bon the right side and

joint con 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.

Fig.2

3.1.3 Removing the front chassis assembly

(See Fig.3)

• Remove the front panel assembly and bottom cover.

(1) Remove the two screws Aon the both sides of the main

body.

(2) Release the two joints dand two joints eon the both sides

of the main body, then remove the front chassis assembly

toward the front.

Fig.3

Front panel assembly

Detach button

Bottom cover

Joint b

Joint c

Joint a

Joint d

Front chassis assembly

Joint e

Joint d Joint e

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3.1.4 Removing the side panel

(See Fig.4)

Reference:

Remove the front panel assembly as required.

(1) Remove the screw Band two screws Cattaching the side

panel on the left side of the main body.

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

Fig.4

3.1.5 Removing the rear bracket

(See Fig.5)

• Remove the bottom cover.

(1) Remove the three screws D, two screws E, screw Fand

screw Gattaching the rear bracket on the back side of the

main body.

(2) Remove the rear bracket.

3.1.6 Removing the main board

(See Figs.5 and 6)

• Remove the front panel assembly, bottom cover and side pan-

el.

Reference:

Remove the front chassis assembly as required.

(1) Remove the three screws Dattaching the rear bracket on

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

(2) Remove the two screws Hattaching the main board. (See

Fig.6.)

(3) Disconnect the connector CN501 on the main board from

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. (See

"3.1.5 Removing the rear bracket".)

Fig.5

Fig.6

Side panel

CBC

Rear bracket

Insert the steering

remote into the slot.

Main board

CN501

Rear bracket

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3.1.7 Removing the CD mechanism assembly

(See Fig. 7)

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

rear bracket and main board.

Reference:

Remove the front chassis assembly as required.

(1) Remove the three screws Jattaching the CD mechanism

assembly on the top chassis.

(2) Take out the CD mechanism assembly.

Fig.7

3.1.8 Removing the switch board

(See Figs.8 to 10)

• Remove the front panel assembly.

(1) Remove the five screws Kon the back side of the front pan-

el assembly. (See Fig.8.)

(2) Release the twelve joints fand remove the rear cover. (See

Fig.9.)

(3) Release the joint gand take out the switch board from the

front panel assembly. (See Fig.10.)

Note:

When removing the rear cover assembly and switch board, be

careful not to lose the spring.

Fig.8

Fig.9

Fig.10

CD mechanism assembly Top chassis

Joints f

Joints fJoints f

Rear cover

Switch board Joint g

Front panel assembly

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3.2 CD Mechanism Assembly

3.2.1 Removing the top cover

(See Figs.1 and 2)

(1) Remove the two screws Aon the both side of the body.

(2) Lift the front side of the top cover and move the top cover

backward to release the two joints a.

Fig.1

Fig.2

Joints a

Top cover

Joints a

Top cover

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