JVC KD-G801, KD-G807 Service Manual

SERVICE MANUAL

CD RECEIVER

MA070B20053

KD-G801,KD-G807

KD-G801

Area suffix

KD-G801

SOUND

ATT

SOURCE

VOL

KD-G807

SOUND

ATT

SOURCE

VOL

-G

807

-G

E ----------- Continental Europe EX --------------- Central Europe

KD-G807

Area suffix EE --------- Russian Federation

KD-G801 EE/EX KD-G807 E

STEERING CABLE

TABLE OF CONTENTS

1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

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

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

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-28

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-29

No.MA070B

2005/3

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)

Equalizer Control Range Low ±12 dB (60 Hz, 80 Hz, 100 Hz, 120 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

Frequency Range FM 87.5 MHz to 108.0 MHz

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

[MW Tuner] Sensitivity 20 µV

[LW Tuner] Sensitivity 50 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 Max. Bit Rate 320 Kbps

WMA (Windows Media Audio) decoding format Max. Bit Rate 192 Kbps

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

Grounding System: Negative ground

Allowable Operating Temperature 0ºC to +40ºC

Dimensions (W × H × D) Installation Size (approx.) 182 mm × 52 mm × 159 mm

Mass (approx.) 1.5 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.

Mid ±12 dB

High ±12 dB (8 kHz, 10 kHz, 12 kHz, 15 kHz)

TUNER SECTION

FM1,2 (for KD-G807) 87.5 MHz to 108.0 MHz

FM3 (for KD-G807) 65.0 MHz to 74.0 MHz

AM (MW) 522 kHz to 1 620 kHz

(LW) 144 kHz to 279 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

Capture Ratio 1.5 dB

Selectivity 35 dB

CD PLAYER SECTION

GENERAL

Panel Size (approx.) 188 mm × 58 mm × 12 mm

Design and specifications are subject to change without notice.

1-2 (No.MA070B)

1.1 Safety Precautions

SECTION 1

PRECAUTION

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.MA070B)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.MA070B)

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.MA070B)1-5

SPECIFIC SERVICE INSTRUCTIONS

2.1 HOW TO IDENTIFY MODELS

2.1.1 NAME PLATE (as same as KD-G807)

Discernment sign

SECTION 2

1-6 (No.MA070B)

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.

(2) Remove the front panel assembly.

3.1.2 Removing the heat sink (See Fig.2)

(1) From the left side of the main body, remove the two screws

A and three screws B attaching the heat sink.

Reference:

Remove the front panel assembly as required.

Front panel assembly

Detach button

Fig.1

AAB

Heat sink

Fig.2

(No.MA070B)1-7

3.1.3 Removing the top chassis assembly (See Figs.3 to 6)

• Prior to performing the following procedures, remove the front

panel assembly and heat sink. (1) From the bottom side of the main body, remove the two

screws C attaching the top chassis assembly to the bottom chassis assembly. (See Fig.3.)

(2) From the both and rear sides of the main body, remove the

four screws D attaching the top chassis assembly to the bottom chassis assembly. (See Figs.4 to 6.)

(3) Lift the top chassis assembly in the direction of the arrow,

disconnect the connector CN501 trol board from the connector CN101 (See Fig.5.)

(4) Take out the top chassis assembly from the bottom chassis

assembly.

on the mechanism con-

on the main board.

Bottom chassis assembly

Top chassis assembly

Fig.3

Top chassis assembly

Bottom chassis assembly

Mechanism control board

Top chassis assembly

Main board

Bottom chassis assembly

Fig.4

CN501

CN101

Fig.5

Top chassis assembly

1-8 (No.MA070B)

Bottom chassis assembly

Fig.6

3.1.4 Removing the front chassis

(See Figs.7 and 8)

• Prior to performing the following procedure, remove the front

panel assembly, heat sink and top chassis assembly. (1) From the both sides of the top chassis assembly, remove

the two screws E attaching the front chassis.

3.1.5 Removing the mechanism control board

(See Fig.9)

• Prior to performing the following procedures, remove the front

panel assembly, heat sink and top chassis assembly. (1) Disconnect the card wire from the connector CN601

mechanism control board.

(2) Remove the five screws F attaching the mechanism control

board.

(3) Release the joints a and b, remove the mechanism control

board.

on the

Top chassis assembly

Front chassis

Mechanism control board

Front chassis

Fig.7

Top chassis assembly

Fig.8

CN601

Fig.9

(No.MA070B)1-9

3.1.6 Removing the CD mechanism assembly (See Fig.10)

• Prior to performing the following procedures, remove the front

panel assembly, heat sink and top chassis assembly.

Reference:

Remove the mechanism control board as required. (1) From the inside of the top chassis assembly, remove the

three screws G attaching the CD mechanism assembly.

(2) Take out the CD mechanism assembly from the top chas-

sis.

Top chassis

CD mechanism assembly

3.1.7 Removing the main board (See Figs.11 and 12)

• Prior to performing the following procedures, remove the front

panel assembly, heat sink and top chassis assembly. (1) From the rear side of the bottom chassis assembly, remove

the two screws H attaching the rear bracket to the bottom chassis assembly. (See Fig.11.)

(2) From the top side of the bottom chassis assembly, remove

the two screws J attaching the main board to the bottom chassis assembly. (See Fig.12.)

(3) Release the stopper of the connector CN702

board in an upward direction, disconnect the card wire from the connector CN702

(4) Disconnect the wire from the connector of the gear bracket

unit. (See Fig.12.)

(5) Disconnect the wire from the connector CN951

board. (See Fig.12.)

Reference:

After connecting the wires, fix the wires with the wire holders.

(6) Take out the main board from the bottom chassis assem-

bly.

. (See Fig.12.)

on the main

Gear bracket unit

Connector

Wire holders

Fig.10

Fig.11

Card wire

CN702

Rear bracket

Bottom chassis assembly

Stopper

Bottom chassis assembly

1-10 (No.MA070B)

Main board

CN951

Fig.12

Wires

3.1.8 Removing the rear bracket

(See Fig.13)

• Prior to performing the following procedures, remove the front

panel assembly, heat sink, top chassis assembly and main board. (1) From the rear side of the main board, remove the cables

from the rear bracket in the direction of the arrow.

(2) Remove the two screw K, screw L and screw M attaching

the rear bracket to the main board.

Reference:

After attaching the rear bracket to the main board, pass the cables through the wire holder and insert them into the slots of the rear bracket.

Cable (KD-G801)

Rear bracket

Cable

Main board

Wire holde

Slots

3.1.9 Removing the front door mechanism assembly

(See Fig.14.)

• Prior to performing the following procedures, remove the front

panel assembly, heat sink, top chassis assembly and main board. (1) From the top side of the bottom chassis assembly, remove

the screw N attaching the FPC guide to the bottom chassis.

(2) Remove the five screws P attaching the gear bracket unit

to the bottom chassis.

Reference:

When attaching the screws N and P, apply a locking agent them.

(3) Take out the gear bracket unit from the bottom chassis.

Bottom chassis

L M

FPC guide

Rear bracket

Fig.13

Gear bracket unit

Fig.14

(No.MA070B)1-11

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