JVC KD-G489UR User manual

SERVICE MANUAL
COPYRIGHT © 2007 Victor Company of Japan, Limited No.MA340
2007/6
CD RECEIVER
MA34020076SERVICE MANUAL
KD-G489UR
COPYRIGHT © 2007 Victor Company of Japan, Limited
* Please refer to the mechanism manual (model TN2007-1010 (No.MY005, No.MY005B))
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 PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11
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1-2 (No.MA340)
SPECIFICATION
Design and specifications are subject to change without notice.
AUDIO AMPLIFIER SECTION
Power Output 20 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/ Mid-range/ Treble ±12 dB at 60 Hz/ 1 kHz/ 7.5 kHz
Frequency Response 40 Hz to 20 000 Hz
Line-Out Level/Impedance 2.5 V/20 k
Ω load (full scale)
Subwoofer-Out Level/Impedance 2.5 V /20 k
Ω load (full scale)
Output Impedance 1 k
Ω
Other Terminal CD changer, AUX (auxiliary) input jack
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
µ V/75 Ω )
50 dB Quieting Sensitivity 16.3 dBf (1.8
µ V/75 Ω )
Alternate Channel Selectivity (400 kHz) 65 dB
Frequency Response 40 Hz to 15 000 Hz
Stereo Separation 35 dB
AM Tuner Sensitivity/Selectivity 20
µ V/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 × 150 mm
Panel Size 188 mm
× 58 mm × 12 mm
Mass 1.4 kg (3.1 lbs) (excluding accessories)

(No.MA340)1-3
SECTION 1
PRECAUTIONS
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.MA340)
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 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.
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

(No.MA340)1-5
1.5 Important for laser products
REPRODUCTION AND POSITION OF LABELS and PRINT
WARNING LABEL and PRINT

1-6 (No.MA340)
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

(No.MA340)1-7
SECTION 3
DISASSEMBLY
3.1 Main body
3.1.1 Removing the Bottom cover
(See Fig.1)
(1) Disengage the five Hooks aengaged Bottom cover.
Fig.1
3.1.2 Removing the Front chassis
(See Fig.2, 3)
(1) Remove the two screws Aattaching the Front chassis.
(See Fig.2)
(2) Remove the two screws B(both side) attaching the Front
chassis. (See Fig.3)
(3) Disengage the Two Hooks bengaged Front chassis. (See
Fig.3)
Fig.2
Fig.3
hook ahook ahook a
A
B
hook b

1-8 (No.MA340)
3.1.3 Removing the Heat sink
(See Fig.4)
(1) Remove the two screws Cand one screw Dattaching the
Heat sink.
Fig.4
3.1.4 Removing the Rear bracket
(See Fig.5)
(1) Remove the one screw Eattaching the Antenna jack.
(2) Remove the one screw Fattaching the LINE OUT jack.
(3) Remove the one screw Gattaching the CD-CH jack.
(4) Remove the one screw Hattaching the IC bracket.
(5) Remove the one screw Jattaching the Remote cable. (only
for KD-AR480 and KD-G531)
(6) Remove the two screws Kattaching the 16pin connector
jack.
(7) Remove the three screws Lattaching the Rear bracket.
Fig.5
3.1.5 Removing the Main board assembly
(See Fig.6)
(1) Remove the two screws Mattaching the Main board as-
sembly.
(2) Disconnect the connector CN501 connected the Main
board assembly and CD board assembly.
Fig.6
CCD
EFGH KK
JLLL
MM

(No.MA340)1-9
3.1.6 Removing the CD mechanism assembly
(See Fig.7)
(1) Remove the three screws Nattaching the CD mechanism
assembly.
Fig.7
3.1.7 Removing the Switch board assembly
(See Fig.8)
(1) Remove the Volume knob from the Front panel assembly.
(2) Remove the six screws Pattaching the Rear cover.
(3) Disengage the nine Hooks cengaged Rear cover.
(4) Lift up the Switch board assembly and then takeout it.
Fig.8
3.2 CD mechanism assembly
For CD mechanism, please refer mechanism manual TN2007-1010 (No.MY005, No.MY005B).
NN
N
PPP
PPP
hook chook chook c
hook c

1-10 (No.MA340)
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
4.2 Standard measuring conditions
Power supply voltage : DC14.4V(10.5 - 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 an-
tenna input. The loss of 6dB need not be considered since direct
reading of figures are applied in this working standard.
4.5 How to connect the extension cable for adjustment
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
Rear bracket
EXTSH002-22P
Extension cable

(No.MA340)1-11
SECTION 5
TROUBLESHOOTING
5.1 16 PIN CORD DIAGRAM
8
7
6
5
4
3
2
1
16
15
14
13
12
11
10
9
BK
RD
NC
WH
GN
VI
GY
YL
OR/WH
NC
NC
1
3
5
7
2
4
6
8
NC
NC
BL/WH
RD
NC
YL
OR/WH
BK
BK Black
RD Red
BL Blue
WH White
GN Green
VI Violet
GY Gray
YL Yellow
BL/WH
WH/BK
GN/BK
VI/BK
GY/BK
OR Orange
1
3
5
7
2
4
6
8
VI
GY
WH
GN
VI/BK
GY/BK
WH/BK
GN/BK
7 RD
16 YL
8 BK
5 BL/WH
3 GN
11 GN/BK
2 VI
10 VI/BK
4 WH
12 WH/BK
1 GY
9 GY/BK
RD RD 7
YL 4
8
5
7
8
1
2
5
3
6
4
RR
Rear Right
FR
FL
RL
Rear Left
Front Right
Front Left
REMOTE Remote out
ACC
MEMORY
ACC Line
GND
Memory Backup Battery+
Ground
ACC
MEMORY
GND
REMOTE
RL+
RL-
RR+
RR-
FL+
FL-
FR+
FR-
15 OR/WH ILL 6
ILL
Illuminations Control

(No.MA340)
VPT
Printed in Japan
Victor company of Japan, Limited
Mobile Entertainment Business Group Mobile Entertainment Category 10-1,1chome,Ohwatari-machi,Maebashi-city,Gumma-ken, 371-8543,Japan