JVC KDAR-370-J Service manual

SERVICE MANUAL

CD RECEIVER

MA24520061

KD-AR370J,KD-G320J,KD-G421E,KD-G421EX,

KD-G421EY,KD-G421EU,KD-G424UI,KD-G425U,

KD-G425UN,KD-G425UT,KD-G425UH,KD-G427EE

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

TABLE OF CONTENTS

1 PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10

3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15

COPYRIGHT © 2006 Victor Company of Japan, Limited

No.MA245

2006/1

SPECIFICATION

KD-AR370/KD-G320

AUDIO AMPLIFIER SECTION

Power Output 18 W RMS × 4 Channels at 4 Ω and [< or =] 1% THD+N
Signal to Noise Ratio 80 dBA (reference: 1 W into 4 Ω)
Load Impedance 4 Ω (4 Ω to 8 Ω allowance)

Tone Control Range Bass ±10 dB at 100 Hz

Treble ±10 dB at 10 kHz

Frequency Response 40 Hz to 20 000 Hz

Line-Out Level/Impedance 2.5 V /20 kΩ load (full scale)
Output Impedance 1 kΩ
Subwoofer-Out Level/Impedance 2.0 V /20 kΩ load (full scale)

Other Terminal CD changer

TUNER SECTION

Frequency Range FM 87.5 MHz to 107.9 MHz (with channel interval set to 100 kHz or

200 kHz)

87.5 MHz to 108.0 MHz (with channel interval set to 50 kHz)

AM 530 kHz to 1 710 kHz (with channel interval set to 10 kHz)

531 kHz to 1 602 kHz (with channel interval set to 9 kHz)

FM Tuner Usable Sensitivity 11.3 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 35 dB

Capture Ratio 1.5 dB

AM Tuner Sensitivity 20 µV

Selectivity 35 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 (32°F to 104°F)
Dimensions (W × H × D) Installation Size (approx.) 182 mm × 52 mm × 150 mm

(7-3/16" × 2-1/16" × 5-15/16")

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

(7-7/16" × 2-5/16" × 7/16")

Mass (approx.) 1.4 kg (3.1 lbs) (excluding accessories)

1-2 (No.MA245)

KD-G421

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 Ω to 8 Ω allowance)

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 2.5 V/20 kΩ load (full scale)
Output Impedance 1 kΩ

Other Terminals CD changer, 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 11.3 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

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)

(No.MA245)1-3

KD-G424

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 Ω to 8 Ω allowance)

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 2.5 V/20 kΩ load (full scale)
Subwoofer-Out Level/Impedance 2.0 V/20 kΩ load (full scale)
Output Impedance 1 kΩ

Other Terminal CD changer

TUNER SECTION

Frequency Range FM 87.5 MHz to 108.0 MHz

AM 531 kHz to 1 602 kHz

FM Tuner Usable Sensitivity 11.3 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

AM Tuner Sensitivity 20 µV

Selectivity 35 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)

1-4 (No.MA245)

KD-G425

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 Ω to 8 Ω allowance)

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 2.5 V/20 kΩ load (full scale)
Subwoofer-Out Level/Impedance 2.0 V/20 kΩ load (full scale)
Output Impedance 1 kΩ

Other Terminal CD changer

TUNER SECTION

Frequency Range FM 87.5 MHz to 108.0 MHz

AM 531 kHz to 1 602 kHz

FM Tuner Usable Sensitivity 11.3 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

AM Tuner Sensitivity 20 µV

Selectivity 35 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)

(No.MA245)1-5

KD-G427

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 Ω to 8 Ω allowance)

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 2.5 V/20 kΩ load (full scale)
Output Impedance 1 kΩ

Other Terminal CD changer

TUNER SECTION

Frequency Range FM1/FM2 87.5 MHz to 108.0 MHz

FM3 65.00 MHz to 74.00 MHz

AM (MW) 522 kHz to 1 620 kHz

(LW) 144 kHz to 279 kHz

FM Tuner Usable Sensitivity 11.3 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

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)

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

• iPod is a trademark of Apple Computer, Inc., registered in the U.S. and other countries.

• Design and specifications are subject to change without notice.

1-6 (No.MA245)

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.MA245)1-7

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

1M

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

1-8 (No.MA245)

Base board

Frame

Flexible wire

Connector

CD mechanism
assembly

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.MA245)1-9

2.1 DIFFERENT POINT

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

KD-AR370 KD-G320 KD-G421 KD-G424 KD-G425 KD-G427

YES YES NO NO NO NO

YES YES

REMOTE

CONTROLLER

2.2 CD MECHANISM

For the CD mechanism, please refer the mechanism manual TN2007-1001 (No.MY003).

YES YES YES YES YES

NO

YES YESNO NO NONO

NO

NO NO NO

1-10 (No.MA245)

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.

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, 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.

Note:

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

Joint a

Front panel assembly

Detach button

Fig.1

Bottom cover

Joint

b

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 joint d and joint e on the both sides of the main

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

Joint a

Joint c

Joint d

Front chassis assembly

Joint b

Fig.2

A

Joint e

Fig.3

(No.MA245)1-11

3.1.4 Removing the side panel
(See Fig.4)

Reference:

Remove the front panel assembly as required.
(1) Remove the 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, three screws E and two

screws F attaching the rear bracket on the back side of the
main body. [For KD-AR370, KD-G320, KD-G424, KD-

G425, KD-G427]

(2) Remove the four screws D, three screws E and two screws

F attaching the rear bracket on the back side of the main

body. [For KD-G421]

(3) Remove the rear bracket.

F

C

E

C

[For KD-AR370,KD-G320,KD-G424,KD-G425,KD-G427]

B

Side panel

Fig.4

Rear bracket

EF

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 D attaching the rear bracket on

the back side of the main body. [For KD-AR370, KD-G320,
KD-G424, KD-G425, KD-G427] (See Fig.5.)

(2) Remove the four screws D attaching the rear bracket on

the back side of the main body. [For KD-G421] (See Fig.5.)

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

Fig.6.)

(4) Disconnect the connector CN501

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".)

on the main board from

DD

[For KD-G421]

Rear bracket

EFE

F

DD

Fig.5

CN501

G

Main board

G

1-12 (No.MA245)

Rear bracket

Fig.6

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 H attaching the CD mechanism

assembly on the top chassis.

(2) Take out the CD mechanism assembly.

H

3.1.8 Removing the switch board

(See Figs.8 to 10)

• Remove the front panel assembly.

(1) Remove the four screws J on the back side of the front pan-

el assembly. (See Fig.8.)
(2) Release the joints f and remove the rear cover. (See Fig.9.)
(3) Release the joint g and take out the switch board from the

front panel assembly. (See Fig.10.)

CD mechanism assembly

J

J

Rear cover

Top chassis

H

Fig.7

J

Fig.8

Joints f

Joints f Joints f

Switch board

Joints f

Fig.9

Joint g

Fig.10

Front panel assembly

(No.MA245)1-13

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(10.5 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.

1-14 (No.MA245)

Heat sink

Extension cable

EXTSH002-22P

Rear bracket

5.1 Feed section

SECTION 5

TROUBLESHOOTING

5.2 Focus section

Is 4V present at both
sides of the feed motor?

NO

Is the voltage output at
pin 4 and pin 5 of IC501?

NO

Is the voltage input at pin
28 of IC501?

NO

Is the voltage output at
pin 7 of IC521?

NO
Is the power supply
present at pin 37,
pin 49, pin 53, pin 56
and pin 72 of IC521?

NO

Check the connections
of CD8V power supply.

YES

Check the feed motor.

Check the connections

YES

between the feed motor
and IC501.

Is the power supply

YES YES

present at pin 3, pin 12
and pin 21 of IC501?

NO

Check the connections
of CD8V power supply.

Check the connections

YES

between IC501 and
IC521.

YES

Check IC521.

Check IC501.

When the lens is
moving:

4V

Does the S-search
waveform appear at
IC501 pins 8 and 9?

NO

Is the voltage input at pin
15 of IC501?

NO

Is the voltage output at
pin 13 of IC521?

NO

Is the power supply
present at pin 37,
pin 49, pin 53, pin 56
and pin 72 of IC521?

NO

Check the connections
of CD8V power supply.

YES

Check the pickup and
its connections.

Is the power supply

YES

present at pin 3, pin 12
and pin 21 of IC501?

Check the connections
of CD8V power supply.

Check the connections

YES

between IC501 and
IC521.

YES

Check IC521.

YES

Check IC501.

NO

(No.MA245)1-15

5.3 Spindle section

Is the disk rotated?

NO

Is the voltage output at
pin 6 and pin 7 of IC501?

NO

Is the voltage input at pin
17 of IC501?

NO

Is the voltage output at
pin 5 of IC521?

NO

Is the power supply
present at pin 37,
pin 49, pin 53, pin 56
and pin 72 of IC521?

NO

YES

Does the RF signal appear
at pin 39 of IC521?

YES

Check the spindle motor
and its wiring.

Is the power supply

YES

present at pin 3, pin 12
and pin 21 of IC501?

Check the connections
of CD8V power supply.

Check the connections

YES

between IC501 and
IC521.

YES

Check IC521.

NO

YES

Is the RF waveform at
pin 39 of IC521 distorted?

Check the circuits in
the vicinity of IC521
or the pickup.

YES

NONO

Check IC501.

YES

Proceed to the Tracking
section

Check the connections
of CD8V power supply.

5.4 Tracking section

When the disc is rotated
at first:

Approx. 1.2V

Is the tracking error
signal output at pin 26
of IC521?

NO

Check the pickup and
its connections.

Replace IC521 or repair

YES

the malfunction
connection point

1-16 (No.MA245)

5.5 Signal processing section

5.5.1 Signal processing section (For KD-AR370,KD-G320,KD-G424 and KD-G425)

Is the sound output from
both channels (L, R)?

YES

Normal

NO

No sound from either
channel.

YES

Is 9V present at pin 24
of IC161?

YES

NO

Compare the L-ch and
R-ch to locate the
defective point.

NO

Is 9V present at pin 13

YES

of IC901?

NO

Check IC901 and its
peripheral circuits.

5.5.2 Signal processing section (For KD-G421 and KD-G427)

Is the sound output from
both channels (L, R)?

YES

Normal

NO

No sound from either
channel.

YES

Is 9V present at pin 32
of IC171?

YES

NO

Compare the L-ch and
R-ch to locate the
defective point.

Is the audio signal
(including sampling
output components)
output to pins 1 and 7 of
IC581 during playback?

NO

Check IC581 and its
peripheral circuits.

Check the connections
between pin 24 of IC161
and pin 13 of IC901.

Is the audio signal
(including sampling
output components)
output to pins 1 and 7 of
IC581 during playback?

NO

Check IC581 and its
peripheral circuits.

Is the audio signal output

YES

at pin 18 and pin 19 of
IC161 during playback?

Check IC161 and its
peripheral circuits.

Is the audio signal output

YES

at pin 18 and pin 19 of
IC171 during playback?

Check IC171 and its
peripheral circuits.

NO

YES

Check the power
amplifier IC301.

NO

NO

Is 9V present at pin 13
of IC901?

NO

Check IC901 and its
peripheral circuits.

Check the connections

YES

between pin 32 of IC171
and pin 13 of IC901.

YES

Check the power
amplifier IC301.

(No.MA245)1-17

5.6 Maintenance of laser pickup

(1) Cleaning the pick up lens

Before you replace the pick up, please try to clean the lens
with a alcohol soaked cotton swab.

(2) Life of the laser diode

When the life of the laser diode has expired, the following
symptoms will appear.

• The level of RF output (EFM output: amplitude of eye
pattern) will be low.

5.7 Replacement of laser pickup

Turn of the power switch and, disconnect the
power cord.

Replace the pickup with a normal one. (Refer
to "Removing the pickup unit" on the previous page.)

Is RF output

1.3 0.4Vp-p?

NO

Replace it.

YES

OK

(3) Semi-fixed resistor on the APC PC board

The semi-fixed resistor on the APC printed circuit board
which is attached to the pickup is used to adjust the laser
power.Since this adjustment should be performed to match
the characteristics of the whole optical block, do not touch
the semi-fixed resistor.
If the laser power is lower than the specified value, the la­ser diode is almost worn out, and the laser pickup should
be replaced. If the semi-fixed resistor is adjusted while the
pickup is functioning normally, the laser pickup may be
damaged due to excessive current.

Plug the power cord in, and turn the power on.
At this time, check that the laser emits for about
seconds and the objective lens moves up and down.
Note: Do not observe the laser beam directly.

Play a disc.

Check the eye-pattern at

RF test point or

ARF test point.

Finish.

1-18 (No.MA245)

5.8 16 PIN CORD DIAGRAM (for KD-AR370 and KD-G320)

BK

8

7

6

5

RD

NC

BL/WH

YL

NC

NC

BR

16

15

14

13

BK

RD

Black

Red

GN

VI

Green

Violet

4

WH

GN

3

VI

2

GY

1

WH/BK

GN/BK

VI/BK

GY/BK

16 YL

8 BK

7 RD

13 BR TEL

5 BL/WH

3 GN

11 GN/BK

12

11

10

9

MEMORY

GND

ACC

REMOTE

RL+

RL-

ONLY

REMOTE

OUTPUT

CAUTION!

WH

BR

BL

Blue

White

Brown

GY

YL

GND

Gray

Yellow

RR

FR

FL

RL

TEL

2 VI

10 VI/BK

4 WH

12 WH/BK

1 GY

9 GY/BK

Rear Right

Front Right

Front Left

Rear Left

Telephone muting

RR+

RR-

FL+

FL-

FR+

FR-

REMOTE

ACC

MEMORY

GND

Remote out

ACC Line

Memory Backup Battery +

Ground

(No.MA245)1-19

5.9 16PIN CORD DIAGRAM (for KD-G421 and KD-G427)

8
7
6
5

BK

RD

NC

BL/WH

YL

NC

NC

BR

16
15
14
13

BK

RD

BL

WH

4

WH

GN

3
2

VI

1

GY

WH/BK

GN/BK

VI/BK

GY/BK

12
11
10

9

BR

Black

Red

Blue

White

Brown

GN

VI

GY

YL

Green

Violet

Gray

Yellow

BR

NC

1

NC

3

BL/WH

5

RD

7

YL

NC

BK

2

4

6

8

RR

FR

FL

RL

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

RD

ACC Line

Telephone Muting

Ground

Memory Backup Battery+

RD 7

YL 4

8

5

2

7

8

1

2

5

6

3

4

VI/BK

VI

1

GY

3

WH

5

GN

7

GY/BK

WH/BK

GN/BK

2

4

6

8

REMOTE

ILL

1-20 (No.MA245)

Remote

Illuminations Control

ANT

Auto Antenna

5.10 16 PIN CORD DIAGRAM (for KD-G424 and KD-G425)

BK

8

YL

16

7
6
5

4
3

2

1

RD

BL

BL/WH

WH

GN

VI

GY

16 YL

8 BK

7 RD

NC

15
14

NC

NC

13

WH/BK

12

GN/BK

11

10

VI/BK

GY/BK

9

MEMORY

GND

ACC

BK

RD

BL

Black

Red

Blue

WH White

GN

Green

VI Violet

GY

YL

Gray

Yellow

GND

RR

FR

3 GN

11 GN/BK

2 VI

10 VI/BK

4 WH

12 WH/BK

1 GY

9 GY/BK

5 BL/WH

6 BL

Rear Right

Front Right

RL+

RL-

RR+

RR-

FL+

FL-

FR+

FR-

REMOTE

ANT

ANT

ACC

REMOTE

OUTPUT

ONLY

POWER

ANTENNA

Auto Antenna

ACC Line

FL

RL

REMOTE

Front Left

Rear Left

Remote

GND

MEMORY

Ground

Memory Backup Battery+

(No.MA245)1-21

Victor Company of Japan, Limited
Mobile Entertainment Business Group Mobile Entertainment Category 10-1,1chome,Ohwatari-machi,Maebashi-city,371-8543,Japan

(No.MA245)

Printed in Japan

VPT

CD RECEIVER KD-AR370/KD-G320

ENGLISH

RECEPTOR CON CD KD-AR370/KD-G320

RECEPTEUR CD KD-AR370/KD-G320

For canceling the display demonstration, see page 7.
Para cancelar la demostración en pantalla, consulte la página 7.
Pour annuler la démonstration des affichages, référez-vous à la page 7.

For installation and connections, refer to the separate manual.
Para la instalación y las conexiones, refiérase al manual separado.
Pour l’installation et les raccordements, se référer au manuel séparé.

INSTRUCTIONS

MANUAL DE INSTRUCCIONES

MANUEL D’INSTRUCTIONS

For customer Use:

Enter below the Model
No. and Serial No. which
are located on the top or
bottom of the cabinet.
Retain this information
for future reference.

Model No.

Serial No.

ESPAÑOL

FRANÇAIS

GET0349-001A

[J]

INFORMATION (For U.S.A.)

This equipment has been tested and found
to comply with the limits for a Class B digital
device, pursuant to Part 15 of the FCC
Rules. These limits are designed to provide
reasonable protection against harmful

ENGLISH

interference in a residential installation.
This equipment generates, uses, and can
radiate radio frequency energy and, if not
installed and used in accordance with the
instructions, may cause harmful interference
to radio communications. However, there
is no guarantee that interference will not
occur in a particular installation. If this
equipment does cause harmful interference
to radio or television reception, which can
be determined by turning the equipment
off and on, the user is encouraged to try to
correct the interference by one or more of
the following measures:
– Reorient or relocate the receiving antenna.
– Increase the separation between the

equipment and receiver.

– Connect the equipment into an outlet on

a circuit different from that to which the
receiver is connected.

– Consult the dealer or an experienced

radio/TV technician for help.

Caution:

Changes or modifications not approved
by JVC could void the user’s authority to
operate the equipment.

Thank you for purchasing a JVC product.

Please read all instructions carefully

before operation, to ensure your complete

understanding and to obtain the best possible

performance from the unit.

How to reset your unit

• Your preset adjustments will also be erased.

• If a disc is loaded, it will eject. Be careful not to

drop the disc.

How to forcibly eject a disc

• If this does not work, reset your unit.

• Be careful not to drop the disc when it ejects.

How to use the MODE button

If you press MODE, the unit goes into functions
mode, then the number buttons and 5/∞
buttons work as different function buttons.

Ex.: When number button 2 works as

MO (monaural) button.

IMPORTANT FOR LASER PRODUCTS

1. CLASS 1 LASER PRODUCT

2. CAUTION: Do not open the top cover.
There are no user serviceable parts inside
the unit; leave all servicing to qualified
service personnel.

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

2

Time countdown indicator

To use these buttons for their original
functions again after pressing MODE, wait for

5 seconds without pressing any of these buttons
until the functions mode is cleared or press
MODE again.

How to read this manual

• Button operations are mainly explained with
the illustrations in the table below.

• Some related tips and notes are explained in
“More about this unit” (see pages 20 – 22).

Press briefly.

Press repeatedly.

Press either

one.

Press and hold until your
desired response begins.

Press and hold both
buttons at the same time.

The following marks are used to indicate...

: Built-in CD player operations.

: External CD changer operations.

: Indicator displayed for the

corresponding operation.

CONTENTS

Control panel — KD-AR370 and KD-G320 ....... 4

Remote controller —

Getting started ................................. 6

Basic operations .................................................... 6

Radio operations .............................. 7

Disc operations ................................. 8

Playing a disc in the unit ...................................... 8

Playing discs in the CD changer ............................ 9

Sound adjustments ........................... 11

General settings — PSM ................... 12

Satellite radio operations .................. 15

iPod®/D. player operations ................ 18

Other external component operations

More about this unit ......................... 20

Maintenance .................................... 23

Troubleshooting ............................... 24

Specifications ................................... 27

RM-RK50 .............. 5

... 20

ENGLISH

How to detach/attach the control

panel

Detaching...

Attaching...

Warning:

If you need to operate the unit while driving,
be sure to look ahead carefully or you may be
involved in a traffic accident.

For safety...

• Do not raise the volume level too much, as
this will block outside sounds, making driving
dangerous.

• Stop the car before performing any
complicated operations.

Temperature inside the car...

If you have parked the car for a long time in hot
or cold weather, wait until the temperature in
the car becomes normal before operating the
unit.

3

Control panel — KD-G612/KD-G611/KD-G511

Control panel — KD-AR370 and KD-G320

Parts identification

ENGLISH

1 4 /¢ buttons
2
3 5 (up) / ∞ (down) buttons
4 Loading slot
5 Display window
6 0 (eject) button
7 EQ (equalizer) button
8 Remote sensor

DO NOT expose the remote sensor to strong
light (direct sunlight or artificial lighting).

9 SRC (source) button
p BAND button
q Control dial
w SEL (select) button
e MO (monaural) button
r SSM (Strong-station Sequential Memory)

button

t Number buttons
y RPT (repeat) button
u RND (random) button
i MODE button
o DISP (display) button
;

(control panel release) button

Display window

(standby/on attenuator) button

Display window

a Disc information indicators—TAG (ID3

Tag),

s Disc type indicators—WMA, MP3
d Playback source indicators—

CH: Lights up only when CD-CH is

DISC: Lights up for the built-in CD player.
f Playback mode / item indicators—

RND (random),
RPT (repeat)

g LOUD (loudness) indicator
h EQ (equalizer) indicator
j Sound mode (C-EQ: custom equalizer)

indicators—JAZZ, CLASSIC, HIP HOP,
POPS, ROCK, USER

k Tr (track) indicator
l Source display / Volume level indicator
/ Main display
z Tuner reception indicators—ST (stereo),

MO (monaural)

(folder), (track/file)

selected as the playback source.

(disc), (folder),

4

Remote controller — RM-RK50

Installing the lithium coin battery

(CR2025)

Main elements and features

ENGLISH

Aim the remote controller directly at the
remote sensor on the unit. Make sure there is
no obstacle in between.

Warning:

• Do not install any battery other than
CR2025 or its equivalent; otherwise, it may
explode.

• Store the battery in a place where children
cannot reach to avoid risk of accident.

• To prevent the battery from over-heating,
cracking, or starting a fire:
– Do not recharge, short, disassemble, heat

the battery, or dispose of it in a fire.

– Do not leave the battery with other

metallic materials.

– Do not poke the battery with tweezers or

similar tools.

– Wrap the battery with tape and insulate

when throwing away or saving it.

Caution:

1 (standby/on/attenuator) button

• Turns the power on if pressed briefly or
attenuates the sound when the power is
on.

• Turns the power off if pressed and held.

2 5 U (up) / D (down) ∞ buttons

• Changes the FM/AM bands with 5 U.

• Changes the preset stations with D ∞.

• Changes the folder of the MP3/WMA
discs.

• While playing an MP3 disc on an
MP3-compatible CD changer:

– Changes the disc if pressed briefly.
– Changes the folder if pressed and held.

• While listening to the satellite (SIRIUS or
XM) radio:

– Changes the categories.

• While listening to an Apple iPod
JVC D. player:

– Pauses/stops or resumes playback with

D ∞.
– Enters the main menu with 5 U.
(Now 5 U/D ∞/2 R/F 3 work as the

menu selecting buttons.)*

3 VOL – / VOL + buttons

• Adjusts the volume level.

or a

®

* 5 U : Returns to the previous menu.
D ∞ : Confirms the selection.

To be continued...

5

4 SOUND button

• Selects the sound mode (C-EQ: custom
equalizer).

5 SOURCE button

• Selects the source.

6 2 R (reverse) / F (forward) 3 buttons

ENGLISH

• Searches for stations if pressed briefly.

• Fast-forwards or reverses the track if
pressed and held.

• Changes the tracks if pressed briefly.

• While listening to the satellite radio:

– Changes the channels if pressed briefly.
– Changes the channels rapidly if pressed

and held.

• While listening to an iPod or a D. player
(in menu selecting mode):

– Selects an item if pressed briefly. (Then,

press D ∞ to confirm the selection.)

– Skips 10 items at a time if pressed and

held.

Getting started

!

• For FM/AM tuner

• For SIRIUS radio

• For XM radio

⁄ Adjust the volume.

Volume level appears.

Basic operations

~ Turn on the power.

Ÿ

* You cannot select these sources if they

are not ready or not connected.

6

Volume level indicator

@ Adjust the sound as you want. (See

pages 11 and 12.)

Caution on volume setting:

Discs produce very little noise compared
with other sources. Lower the volume
before playing a disc to avoid damaging
the speakers by the sudden increase of the
output level.

To drop the volume in a
moment (ATT)

To restore the sound, press
it again.

To turn off the power

Basic settings

• See also “General settings — PSM” on pages
12 – 14.

! Start searching for a station.

1

2

1 Canceling the display

demonstrations

Select “DEMO,” then “DEMO OFF.”

2 Setting the clock

Select “CLOCK H” (hour), then adjust

the hour.

Select “CLOCK M” (minute), then

adjust the minute.

3 Finish the procedure.

To check the current clock
time when the power is
turned off

When a station is received, searching
stops.
To stop searching, press the same button
again.

To tune in to a station manually

In step ! above...
1

2 Select a desired station frequency.

When an FM stereo broadcast is hard to
receive

ENGLISH

Radio operations

~

Ÿ

Lights up when receiving an FM stereo
broadcast with sufficient signal strength.

Selected band appears.

Lights up when monaural mode is activated.

Reception improves, but stereo effect will be
lost.

To restore the stereo effect, repeat the same
procedure. “MONO OFF” appears and the MO
indicator goes off.

7

Storing stations in memory

Listening to a preset station

You can preset six stations for each band.

FM station automatic presetting —

ENGLISH

SSM (Strong-station Sequential
Memory)

1 Select the FM band (FM1 – FM3) you

want to store into.

2

3

“SSM” flashes, then disappears when
automatic presetting is over.

Local FM stations with the strongest signals are
searched and stored automatically in the FM
band.

Manual presetting

Ex.: Storing FM station of 92.5 MHz into preset

number 4 of the FM1 band.

1

1

2 Select the preset station (1 – 6) you

want.

or

To check the other information while
listening to an FM or AM station

Clock Ô Frequency

Disc operations

Playing a disc in the unit

All tracks will be played repeatedly until you
change the source or eject the disc.

2

3

Preset number flashes for a while.

8

To stop play and eject the
disc