JVC KD-AR3000 User manual

SERVICE MANUAL
COPYRIGHT © 2004 VICTOR COMPANY OF JAPAN, LIMITED No.MA042
2004/1
CD RECEIVER
MA04220041KD-AR3000, KD-LH300
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-27
5 TROUBLE SHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-28
Area suffix
J -------------- Northern America
KD-AR3000
KD-LH300
KD-AR3000
Line input terminal
Amplifier gain control
KD-LH300
Power antenna control

1-2 (No.MA042)
SPECIFICATION
Design and specifications are subject to change without notice.
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)
Equalizer Control Range Frequencies 60 Hz, 150 Hz, 400 Hz, 1 kHz, 2.4 kHz, 6 kHz, 12 kHz
Level ±10 dB
Frequency Response 40 Hz to 20 000 Hz
Signal-to-Noise Ratio 70 dB
Line-Out Level/Impedance KD-AR3000 1.5 V/20 kΩload
Line-Out Level/Impedance KD-AR3000 5.0 V/20 kΩload (full scale)
KD-LH300 4.0 V/20 kΩload (full scale)
Output Impedance 1 kΩ
Subwoofer-Out Level/Impedance 2.0 V/20 kΩload (full scale)
TUNER SECTION
Frequency Range FM 87.5 MHz to 107.9 MHz
AM 530 kHz to 1 710kHz
[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
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 MPEG 1/2 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 0ºC to +40ºC (32ºF to 104ºF)
Dimensions (W ×H ×D) Installation Size (approx.) 182 mm ×52 mm ×159 mm (7-3/16" ×2-1/16" ×6-5/16")
Panel Size (approx.) 188 mm ×58 mm ×12 mm (7-7/16" ×2-5/16" ×1/2")
Mass (approx.) 1.6 kg (3.5 lbs) (excluding accessories)

(No.MA042)1-3
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.

1-4 (No.MA042)
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 CDpickup may be destroyed by static electricity.)
• In the assembly, be sure to remove solder from the short land after connecting the flexible wire.
1M
(caption)
Anti-static wrist strap
Conductive material
(conductive sheet) or iron plate
Pickup
Short-circuit point
(Soldering)
Flexible wire

(No.MA042)1-5
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

1-6 (No.MA042)
SECTION 3
DISASSEMBLY
3.1 Main body
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.
Fig.1
3.1.2 Removing the heat sink
(See Fig.2)
(1) From the left side of the main body, remove the two screws
Aand three screws Battaching the heat sink.
Fig.2
Front panel assembly
Detach button
Heat sink
AAB

(No.MA042)1-7
3.1.3 Removing the top chassis assembly
(See Figs.3 to 6)
• Prior to performing the following procedures, remove the heat
sink.
Reference:
Remove the front panel assembly as required.
(1) From the bottom side of the main body, remove the two
screws Cattaching 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 Dattaching 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 on the mechanism con-
trol board from the connector CN702 on the main board.
(See Figs.5 and 6.)
(4) Take out the top chassis assembly from the bottom chassis
assembly.
Fig.3
Fig.4
Fig.5
Fig.6
Top chassis assembly
C
C
Bottom chassis assembly
Bottom chassis assembly
Top chassis assembly
D
Top chassis assembly
D
Bottom chassis assembly
Mechanism control board
Main board CN702
CN501
Top chassis assembly
Bottom chassis assembly
Rear bracket
D
D

1-8 (No.MA042)
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 Eattaching the front chassis.
Fig.7
Fig.8
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 on the
mechanism control board.
(2) Remove the five screws Fattaching the mechanism control
board.
(3) Release the joints aand b, remove the mechanism control
board.
Fig.9
Top chassis assembly
Front chassis
E
Top chassis assembly
Front chassis
E
Mechanism control board CN601
F
F
F
ab

(No.MA042)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 Gattaching the CD mechanism assembly.
(2) Take out the CD mechanism assembly from the top chas-
sis.
Fig.10
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 Hattaching 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 Jattaching the main board to the bottom
chassis assembly. (See Fig.12.)
(3) Release the stopper of the connector CN701 on the main
board in an upward direction, disconnect the card wire from
the connector CN701. (See Fig.12.)
(4) Disconnect the wire from the connector of the front door
mechanism assembly. (See Fig.12.)
(5) Disconnect the wire from the connector CN951 on the main
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.
Fig.11
Fig.12
Top chassis G
GG
CD mechanism assembly
Rear bracket
H
Bottom chassis assembly
Connector
Wire holders CN701
Stopper
Bottom chassis assembly
J
J
CN951 Wires
Main board
Card wire
Front door mechanism assembly

1-10 (No.MA042)
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 wires
from the rear bracket in the direction of the arrow.
(2) Remove the two screws Kand three screws Lattaching the
rear bracket to the main board.
Reference:
After attaching the rear bracket to the main board, pass
the wires through the wire holder and insert them into the
slots of the rear bracket.
Fig.13
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 Mattaching the shaft holder to the bottom chas-
sis.
(2) Remove the five screws Nattaching the front door mecha-
nism assembly to the bottom chassis.
Reference:
When attaching the screws Mand N, apply a locking
agent them.
(3) Take out the front door mechanism assembly from the bot-
tom chassis.
Fig.14
Rear bracket
L
L K
K
Main board
Wire holder
Slots
Wire (KD-AR3000)
Rear bracket
Wire
Bottom chassis
NN
M
Shaft holder
Front door mechanism assembly