Jvc KD-G437, KD-G436, KD-G435, KD-G431-E, KD-G431-EY Service Manual

...

SERVICE MANUAL

CD RECEIVER

MA290200612SERVICE MANUAL

KD-G431E, KD-G431EX, KD-G431EY,

KD-G431EU, KD-G433UI, KD-G434UI,

KD-G435U, KD-G435UN, KD-G435UT,

KD-G435UH, KD-G436U, KD-G436UN,

KD-G436UT, KD-G436UH, KD-G437EE,

KD-G387EE

(for europe)

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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11

No.MA290

2006/12

SPECIFICATION

AUDIO AMPLIFIER SECTION

Maximum Power Output Front/Rear 50 W per channel

Continuous Power Output (RMS)

Tone Control Range Bass ±12 dB at 60 Hz

Frequency Range: FM (for Asia) 87.5 MHz to 108.0 MHz

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

AM Tuner (for Asia) Sensitivity/Selectivity 20 µV/35 dB MW Tuner (for EE) Sensitivity/Selectivity 20 µV/35 dB LW Tuner (for EE) 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)

Dimensions (W × H × D):

(approx.)

Mass 1.3 kg (excluding accessories)

Front/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 Ω to 8 Ω allowance)

Mid-range ±12 dB at 1 kHz

Treble ±12 dB at 7.5 kHz

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 Terminals CD changer (for KD-G437) AUX (auxiliary) input jack

TUNER SECTION

FM1 (for EY) 87.5 MHz to 108.0 MHz

FM1/FM2 (for EE) 87.5 MHz to 108.0 MHz

FM3 (for EE) 65.00 MHz to 74.00 MHZ

AM (for Asia) 531 kHz to 1 602 kHz

AM (for EE) MW: 522 kHz to 1620 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

CD PLAYER SECTION

GENERAL

Grounding System Negative ground

Allowable Operating Temperature 0°C to +40°C Installation Size 182 mm × 52 mm × 150 mm Panel Size 187 mm × 58 mm × 13 mm

Design and specifications are subject to change without notice.

1-2 (No.MA290)

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.MA290)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 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.

(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 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.

Pickup

Wires

Push switch

1-4 (No.MA290)

Base board

Frame

Flexible wire

Connector

CD mechanism assembly

Pickup

1.5 Important for laser products

1.CLASS 1 LASER PRODUCT

2.CAUTION :

(For U.S.A.) Visible and/or invisible class II laser radiation when open. Do not stare into beam. (Others) Visible and/or invisible class 1M laser radiation when open. Do not view directly with optical instruments.

3.CAUTION : Visible and/or invisible laser radiation when open and inter lock failed or defeated. Avoid direct exposure to beam.

4.CAUTION : This laser product uses visible and/or 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 and PRINT

WARNING LABEL and PRINT

(No.MA290)1-5

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

1-6 (No.MA290)

3.1 Main body

3.1.1 Removing the Bottom cover (See Fig.1)

(1) Disengage the five hooks a engaged Bottom cover.

SECTION 3

DISASSEMBLY

Hook a Hook aHook a

3.1.2 Removing the Front chassis assembly (See Fig.2)

(1) Remove the two screws A (both side of Front chassis as-

sembly) attaching the Front chassis assembly.

(2) Disengage the two hooks b (both side of the Front chassis

assembly) engaged the Front chassis assembly.

3.1.3 Removing the Rear bracket (See Fig.3)

(1) Remove the one screw B attaching the remote cable. (only

for Europe) (2) Remove the one screw C attaching the antenna jack. (3) Remove the one screw D attaching the LINE OUT jack. (4) Remove the one screw E attaching the CD-CH jack. (5) Remove the one screw F attaching the IC bracket. (6) Remove the two screws G attaching the 16pin connector. (7) Removing the three screws H attaching the Rear bracket.

Fig.1

Hook b

Fig.2

CDEF

Fig.3

(No.MA290)1-7

3.1.4 Removing the Heat sink (See Fig.4)

(1) Remove the two screws J and one screw K attaching the

Heat sink.

3.1.5 Removing the Main board assembly (See Fig.5)

(1) Remove the two screws L attaching the Main board as-

sembly.

(2) Disconnect the connector CN501

board assembly and CD board assembly.

connected the Main

JJK

Fig.4

CN501

3.1.6 Removing the CD mechanism assembly (See Fig.6)

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

assembly.

Fig.5

Fig.6

1-8 (No.MA290)

3.2 Front panel assembly

3.2.1 Removing the Rear cover

(See Fig.7)

(1) Remove the volume knob from Front panel assembly. (2) Remove the five screws N attaching the Rear cover. (3) Disengage the fourteen hooks c engaged Rear cove.

CAUTION:

When remove the Rear cover, Detach knob and spring are easy to come off to easy, do not lost them.

Hook

3.2.2 Remove the Switch board assembly

(See Fig.8)

(1) Disengage the Illumination lens from engaged part of Front

cover.

(2) Lift up the Switch board assembly, and then remove it.

CAUTION:

When remove the Switch board assembly, each knob come off to easy, do not lost them.

3.3 CD mechanism assembly

For CD mechanism, please refer mechanism manual TN2007-1010 (No.MY005

Hook

Illumination lens

and No.MY005B).

Fig.7

Fig.8

Hook

(No.MA290)1-9

SECTION 4

ADJUSTMENT

4.1 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

4.5 How to connect the extension cable for adjustment

4.2 Standard measuring conditions

Power supply voltage : DC14.4V(10.5 to 16V)

Load impedance : 20KΩ(2 Speakers connection)

Output Level : Line out 2.0V (Vol. MAX)

4.3 Standard volume position

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

4.4 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.

CAUTION :

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

Heat sink

Extension cable

EXTSH002-22P

Rear bracket

1-10 (No.MA290)

5.1 16PIN CORD DIAGRAM (for Europe)

8 7

4 3 2 1

BL/WH

WH/BK

GN/BK

VI/BK

GY/BK

16 15

14 13

12 11 10

SECTION 5

TROUBLESHOOTING

Black

Red

Blue

White

Brown

Green

Violet

Gray

Yellow

BL/WH

7 RD

16 YL

8 BK

5 BL/WH

13 BR

3 GN

11 GN/BK

2 VI

10 VI/BK

4 WH

12 WH/BK

1 GY

9 GY/BK

Rear Right

Front Right

Front Left

Rear Left

ACC

TEL

GND

MEMORY

ACC Line

Telephone Muting

Ground

Memory Backup Battery+

RD 7

YL 4

VI/BK

GY/BK

WH/BK

GN/BK

REMOTE

ILL

Remote

Illuminations Control

ANT

Auto Antenna

(No.MA290)1-11

5.2 16 PIN CORD DIAGRAM (for Asia)

7 6 5

4 3

BL/WH

16 YL

8 BK

7 RD

3 GN

11 GN/BK

2 VI

15 14

WH/BK

GN/BK

VI/BK

GY/BK

MEMORY

GND

ACC

RL+

RL-

RR+

Black

Red

Blue

WH White

Green

VI Violet

Gray

Yellow

GND

REMOTE

10 VI/BK

4 WH

12 WH/BK

1 GY

9 GY/BK

5 BL/WH

6 BL

Rear Right

Front Right

Front Left

Rear Left

Remote

RR-

FL+

FL-

FR+

FR-

REMOTE

ANT

ACC

GND

MEMORY

REMOTE

OUTPUT

ONLY

POWER

ANTENNA

Auto Antenna

ACC Line

Ground

Memory Backup Battery+

1-12 (No.MA290)

(No.MA290)1-13

+ 30 hidden pages