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

(No.MA042)1-11
3.1.10 removing the front board
(See Figs.15 to 18)
• Prior to performing the following procedures, remove the front
panel assembly.
(1) From the rear side of the front panel assembly, remove the
fourscrewsPattaching the rear cover assembly to the front
panel assembly. (See Fig.15.)
(2) Release the twelve joints cof the front panel assembly and
remove the rear cover assembly. (See Fig.16.)
(3) From the left side of the front panel assembly, pull out the
knob in the direction of the arrow 2 while pulling the front
board in the direction of the arrow 1. (See Fig.17.)
(4) Take out the front board from the front panel assembly.
(See Fig.18.)
Note:
When removing the rear cover assembly and front
board, be careful not to lose the comp. spring. (See
Fig.18.)
Fig.15
Fig.16
Fig.17
Fig.18
PRear cover assembly P
P
Rear cover assembly
joints cjoints c
joints cjoints c
12
Front panel assembly
Front board
Knob
Front board
Front panel assembly
Comp. spring

1-12 (No.MA042)
3.2 CD Mechanism section
3.2.1 Removing the top cover
(See Figs.1 and 2)
(1) Remove the four screws Aon the both side of the body.
(2) Lift the front side of the top cover and move the top cover
backward to release the two joints a.
Fig.1
Fig.2
A
A
A
Joints a
Top cover
Joints a
Top cover

(No.MA042)1-13
3.2.2 Removing the connector board
(See Figs.3 to 5)
CAUTION:
Before disconnecting the flexible wire from the pickup, solder
the short-circuit point on the pickup. No observance of this in-
struction may cause damage of the pickup.
(1) Remove the screw Bfixing the connector board.
(2) Solder the short-circuit point on the pickup.
(3) Disconnect the flexible wire from the pickup.
(4) Move the connector board in the direction of the arrow to
release the two joints b.
(5) Unsolder the wires on the connector board if necessary.
CAUTION:
Unsolder the short-circuit point after reassembling.
Fig.3
Fig.4
Fig.5
B
Connector board
Pickup
Short-circuit point
Joints b
Wires
Pickup
Short-circuit point
(Soldering)
Flexible wire
B
Flexible wire
Connector board
Frame

1-14 (No.MA042)
3.2.3 Removing the DET switch
(See Figs.6 and 7)
(1) Extend the two tabs cof the feed sw. holder and pull out
the switch.
(2) Unsolder the DET switch wire if necessary.
Fig.6
Fig.7
Connector
board
DET
switch
Pickup
DET switch Tab c
Tab c
DET switch wire
Feed sw. holder

(No.MA042)1-15
3.2.4 Removing the chassis unit
(See Figs.8 and 9)
• Prior to performing the following procedure, remove the top
cover and connector board.
(1) Remove the two suspension springs (L) and (R) attaching
the chassis unit to the frame.
CAUTION:
• The shape of the suspension spring (L) and (R) are dif-
ferent. Handle them with care.
• When reassembling, make sure that the three shafts
on the underside of the chassis unit are inserted to the
dampers certainly.
Fig.8
Fig.9
Suspension spring (L)
Suspension spring (L)
Suspension spring (R)
Suspension spring (R)
Chassis unit
Frame
Chassis unit
Frame
Shafts
Shaft
Dampe
r
Damper
Damper

1-16 (No.MA042)
3.2.5 Removing the clamper assembly
(See Figs.10 and 11)
• Prior to performing the following procedure, remove the top
cover.
(1) Remove the clamper arm spring.
(2) Move the clamper assembly in the direction of the arrow to
release the two joints d.
Fig.10
Fig.11
Clamper arm
spring
Chassis rivet
assembly
Joint d
Joint d Clamper assembly
Clamper arm spring
Clamper assembly
Joint d
Joint d
Chassis rivet assembly

(No.MA042)1-17
3.2.6 Removing the loading / feed motor assembly
(See Figs.12 and 13)
• Prior to performing the following procedure, remove the top
cover, connector board and chassis unit.
(1) Remove the screw Cand move the loading / feed motor as-
sembly in the direction of the arrow to remove it from the
chassis rivet assembly.
(2) Disconnect the wire from the loading / feed motor assembly
if necessary.
CAUTION:
When reassembling, connect the wire from the loading /
feed motor assembly to the flame as shown in Fig.12.
Fig.12
Fig.13
Loading / feed motor assembly
Loading / feed motor assembly
C

1-18 (No.MA042)
3.2.7 Removing the pickup unit
(See Figs.14 to 18)
• Prior to performing the following procedure, remove the top
cover, connector board and chassis unit.
(1) Remove the screw Dand pull out the pu. shaft holder from
the pu. shaft.
(2) Remove the screw Eattaching the feed sw. holder.
(3) Move the part eof the pickup unit upward with the pu. shaft
and the feed sw. holder, then release the joint fof the feed
sw. holder in the direction of the arrow. The joint gof the
pickup unit and the feed rack is released, and the feed sw.
holder comes off.
(4) Remove the pu. shaft from the pickup unit.
(5) Remove the screw Fattaching the feed rack to the pickup
unit.
3.2.8 Reattaching the pickup unit
(See Figs.14 to 17)
(1) Reattach the feed rack to the pickup unit using the screw F.
(2) Reattach the feed sw. holder to the feed rack while setting
the joint gto the slot of the feed rack and setting the joint f
of the feed rack to the switch of the feed sw. holder correct-
ly.
(3) As the feed sw. holder is temporarily attached to the pickup
unit, set to the gear of the joint gand to the bending part of
the chassis (joint h) at a time.
CAUTION:
Make sure that the part i on the underside of the feed
rack is certainly inserted to the slot j of the change lock
lever.
(4) Reattach the feed sw. holder using the screw E.
(5) Reattach the pu. shaft to the pickup unit. Reattach the pu.
shaft holder to the pu. shaft using the screw D.
Fig.14
Fig.15
Fig.16
Fig.17
Fig.18
Feed sw. holder
E
D
Joint g
Joint f
Part e
Pickup unit
Pu. shaft holder
Pu. shaft
Feed sw. holder
Part e
Pickup unit
Feed rack
Feed sw. holder
D
E
Joint f
Pu. shaft holde
r
Pu. shaft
Pickup unit
Joint h
Part i
Slot j
Joint g
FFeed rack
Pickup unit
Joint f
Joint g
Feed rack
Pickup unit
Feed sw. holder

(No.MA042)1-19
3.2.9 Removing the trigger arm
(See Figs.19 and 20)
• Prior to performing the following procedure, remove the top
cover, connector board and clamper unit.
(1) Turn the trigger arm in the direction of the arrow to release
the joint kand pull out upward.
CAUTION:
When reassembling, insert the part m and n of the trigger
arm into the part p and q at the slot of the chassis rivet
assembly respectively and join the joint kat a time.
Fig.19
Fig.20
3.2.10 Removing the top plate assembly
(See Fig.21)
• Prior to performing the following procedure, remove the top
cover, connector board, chassis unit, and clamper assembly.
(1) Remove the screw H.
(2) Move the top plate assembly in the direction of the arrow to
release the two joints r.
(3) Unsolder the wire marked s if necessary.
Fig.21
Joint k
Trigger arm
Chassis rivet assembly
Trigger arm
Chassis
rivet
assembly
Part p
Part m
Part n
Part q
Top plate assembly
Joints
r
s
H

1-20 (No.MA042)
3.2.11 Removing the mode sw. / select lock arm
(See Figs.22 and 23)
• Prior to performing the following procedure, remove the top
plate assembly.
(1) Bring up the mode sw. to release from the link plate (joint t)
and turn in the direction of the arrow to release the joint u.
(2) Unsolder the wire of the mode sw. marked s if necessary.
(3) Turn the select lock arm in the direction of the arrow to re-
lease the two joints v.
(4) The select lock arm spring comes off the select lock arm at
the same time.
Fig.22
Fig.23
Mode sw.
Select lock arm
Joint t
Link plate
Joint u s
Top plate
Top plate
Select lock arm
Select lock
arm spring
Select lock arm
Link plate
Joints v
Hook w