JVC KD-AR390J User manual

SERVICE MANUAL
COPYRIGHT © 2008 Victor Company of Japan, Limited No.MA376<Rev.002>
2008/5
CD RECEIVER
MA376<Rev.002>20085SERVICE MANUAL KD-AR390J, KD-G340J,
KD-G444UI, KD-G445U,
KD-G445UN, KD-G445UT,
KD-G445UH, KD-G446U,
KD-G446UN, KD-G446UT,
KD-G446UH, KD-S25J
COPYRIGHT © 2008 Victor Company of Japan, Limited
Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)
Lead free solder used in the board (material : Sn-Cu, melting point : 230 Centigrade)
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20
only for KD-AR390/KD-G340/KD-S25

1-2 (No.MA376<Rev.002>)
SPECIFICATION
KD-AR390/KD-G340/KD-S25
Design and specifications are subject to change without notice.
AUDIO AMPLIFIER SECTION
Power Output 20 W RMS ×4 Channels at 4 Ωand < or = 1% THD+N
Signal-to-Noise Ratio 80 dBA (reference: 1 W into 4 Ω)
Load Impedance 4 Ω(4 Ωto 8 Ωallowance)
Tone Control Range Bass ±12 dB (60 Hz, 80 Hz, 100 Hz, 120 Hz)
Mid-range ±12 dB (500 Hz, 1.0 kHz, 1.5 kHz, 2.5 kHz)
Treble ±12 dB (7.5 kHz 10.0 kHz 12.5 kHz 15.0 kHz)
Q (band width) Q0.5 to Q2.0
Frequency Response 40 Hz to 20 000 Hz
Line-Out Level/Impedance KD-AR390 5.0 V/20 kΩload (full scale)
KD-G340/KD-S25 2.5 V/20 kΩload (full scale)
Subwoofer-Out Level/Impedance KD-AR390 5.0 V /20 kΩload (full scale)
KD-G340/KD-S25 2.5 V/20 kΩload (full scale)
Output Impedance 1 kΩ
Other Terminal AUX (auxiliary) input jack CD changer jack Steering wheel remote
input (only for KD-AR390) Antenna
TUNER SECTION
Frequency Range FM
with channel interval set to 100 kHz or 200 kHz : 87.5 MHz to 107.9 MHz
with channel interval set to 50 kHz : 87.5 MHz to 108.0 MHz
AM with channel interval set to 10 kHz : 530 kHz to 1 710 kHz
with channel interval set to 9 kHz : 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 35 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) (approx.) Installation Size 182 mm ×52 mm ×160 mm (7-3/16” ×2-1/16” ×6-5/16”)
Panel Size 188 mm ×58 mm ×6 mm (7-7/16” ×2-5/16” ×1/4”)
Mass 1.3 kg (2.9 lbs) (excluding accessories)

(No.MA376<Rev.002>)1-3
KD-G444/KD-G445/KD-G446
Design and specifications are subject to change without notice.
AUDIO AMPLIFIER SECTION
Maximum Power Output Front/Rear 50 W per channel
Continuous Power Output (RMS) Front/Rear 19 W per channel into 4 Ω40 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 ±12 dB (60 Hz, 80 Hz, 100 Hz, 120 Hz)
Mid-range ±12 dB (500 Hz, 1 kHz, 1.5 kHz, 2.5 kHz)
Treble ±12 dB (7.5 kHz, 10 kHz, 12.5 kHz, 15 kHz)
Q (Q-slope) Q0.5 to Q2.0
Frequency Response 40 Hz to 20 000 Hz
Signal-to-Noise Ratio 70 dB
Line-Out Level/Impedance 2.5 V/20 kΩload (full scale)
Subwoofer-Out Level/Impedance 2.5 V/20 kΩload (full scale)
Output Impedance 1kΩ
Other Terminal AUX (auxiliary) input jack, CD changer jack
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
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 320 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) (approx.) Installation Size 182 mm × 52 mm × 160 mm
Panel Size 187 mm
× 58 mm × 6 mm
Mass 1.3 kg (excluding accessories)

1-4 (No.MA376<Rev.002>)
SECTION 1
PRECAUTION
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.

(No.MA376<Rev.002>)1-5
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.
(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 card wire is disconnected from the connector on the pickup unit.
(If the card 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 card wire.
1M
(caption)
Anti-static wrist strap
Conductive material
(conductive sheet) or iron plate
Wires Push switch
Pickup
Base board
Pickup
Connector
Flexible wire
Frame CD mechanism
assembly

1-6 (No.MA376<Rev.002>)
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.
REPRODUCTION AND POSITION OF LABELS and PRINT
!Please use enough caution not to
see the beam directly or touch it
in case of an adjustment or operation
check.
WARNING LABEL and PRINT

(No.MA376<Rev.002>)1-7
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.
SECTION 3
DISASSEMBLY
3.1 Main body (used figure is KD-AR390)
3.1.1 Removing the FRONT CHASSIS assembly (See Fig.1)
(1) Disengage the four hooks aengaged the both side of the
FRONT CHASSIS assembly.
Fig.1
3.1.2 Removing the HEAT SINK (See Fig.2, 3)
(1) Remove the three screws Aand the two screws Battaching
the HEAT SINK. (See Fig.2)
(2) Remove the two screws Cand the one screw Dattaching
the HEAT SINK. (See Fig.3)
Fig.2
Fig.3
3.1.3 Removing the BOTTOM COVER (See Fig.4)
(1) Remove the one screw Eattaching the BOTTOM COVER.
(2) Slide the BOTTOM COVER to backward.
Fig.4
hook a
A
B
C
D
E

1-8 (No.MA376<Rev.002>)
3.1.4 Removing the MAIN BOARD assembly (See Fig.5,6)
(1) Remove the two screws Fand one screw Gattaching the
MAIN BOARD assembly. (See Fig.5)
(2) Remove the two screws Hattaching the MAIN BOARD assembly.
(See Fig.6)
(3) Disconnect the connector CN501 connected to MAIN
BOARD assembly and CD MECHANISM assembly. (See
Fig.6)
Fig.5
Fig.6
3.1.5 Removing the CD MECHANISM assembly (See Fig.7)
(1) Remove the three screws Jattaching the CD MECHANISM
assembly.
Fig.7
F
G
H
CN501
J
J

(No.MA376<Rev.002>)1-9
3.1.6 Removing the SWITCH BOARD assembly (See Fig.8)
(1) Remove the VOLUME KNOB.
(2) Remove the four screws Kattaching the REAR COVER.
(3) Disengage the nine hooks bengaged the REAR COVER.
Fig.8
3.2 CD MECHANISM assembly section
• Remove the CD MECHANISM assembly from the main body.
3.2.1
Removing the MECHANISM CONTROL BOARD
assembly (See Fig.
1 and 2 )
(1) From the bottom side of CD MECHANISM assembly,
remove the solders from the soldered sections (
a , b and
c ) on the MECHANISM CONTROL BOARD assembly.
(See Fig.
1 .)
(2) Remove the three screws Aand one screw Battaching the
MECHANISM CONTROL BOARD assembly. (See Fig.1.)
(3) Solder the short land sections on the pickup. (See Fig.2.)
Caution:
• Solder the short land sections on the pickup before
disconnecting the flexible wire from the connector
CN102 on the MECHANISM CONTROL BOARD as-
sembly.
If the card wire is disconnected without attaching
solder, the pickup may be destroyed by static
electricity. (See Fig.
2 .)
• When attaching the MECHANISM CONTROL
BOARD assembly, remove the solders from the
short land sections after connecting the flexible
wire to the connector CN102 on the MECHANISM
CONTROL BOARD assembly.
Fig.1
Fig.2
hook b
hook b
K
K
A
CN102
Mechanism
control board
A
A
B
b
a
c
Mechanism control board
CN102
Pickup
Flexible wire
Short land section

1-10 (No.MA376<Rev.002>)
3.2.2 Removing the top cover (See Fig.3 to 5)
• Remove the MECHANISM CONTROL BOARD assembly.
(1) From the front side of the CD MECHANISM assembly,
change the hook position of the two roller springs. (See
Fig.3.)
(2) From the side of the CD MECHANISM assembly, remove
the six screws Cattaching the top cover. (See Fig.3 and 4.)
(3) Take out the top cover in an upward direction. (See Fig.5.)
Fig.3
Fig.4
Fig.5
C
Top cover
Roller spring Roller spring
C
C
Top cover
Top cover