JVC KD-LH911, KD-LH917 Service Manual
SERVICE MANUAL
CD/SD RECEIVER
MA15720053
KD-LH911,KD-LH917
KD-LH911
Area suffix
KD-LH911
KD-LH917
E ------------ Southern Europe
EX ------------ Northern Europe
EY ------------- Eastern Europe
EU --------------------------Turkey
KD-LH917
Area suffix
EE --------- Russian Federation
KD-LH911 KD-LH917
STEERING REMOTE
٤
TABLE OF CONTENTS
1 PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-26
COPYRIGHT © 2005 Victor Company of Japan, Limited
No.MA157
2005/3
SPECIFICATION
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
harmonic distortion.
Rear 19 W per channel into 4
harmonic distortion.
Load Impedance 4
Equalizer Control Range Low ±12 dB (60 Hz, 80 Hz, 100 Hz, 120 Hz)
Mid ±12 dB (Fix)
High ±12 dB (8 kHz, 10 kHz, 12 kHz, 15 kHz)
Frequency Response 40 Hz to 20 000 Hz
Signal-to-Noise Ratio 70 dB
Line-Out Level/Impedance 5.0 V/20 k
Output Impedance 1 k
Subwoofer-Out Level/Impedance 2.0 V/20 kΩ load (full scale)
Other Terminals CD changer, Steering wheel remote input
TUNER SECTION
Frequency Range FM (KD-LH911 only) 87.5 MHz to 108.0 MHz
FM1/FM2 (KD-LH917 only) 87.5 MHz to 108.0 MHz
FM3 (KD-LH917 only) 65.00 MHz to 74.00 MHz
AM (MW) 522 kHz to 1 620 kHz
FM Tuner Usable Sensitivity 11.3 dBf (1.0
50 dB Quieting Sensitivity 16.3 dBf (1.8
Alternate Channel Selectivity (400 kHz) 65 dB
Frequency Response 40 Hz to 15 000 Hz
Stereo Separation 35 dB
Capture Ratio 1.5 dB
MW Tuner Sensitivity 20
Selectivity 35 dB
LW Tuner Sensitivity 50
CD/SD 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 (MPEG1/2 Audio Layer 3) Max. Bit Rate 320 kbps
WMA (Windows Media Audio) Max. Bit Rate 192 kbps
Playable SD Card Format Fat 12/16
Storage Up to 512 MB
Playable Audio Format for SD Card MP3/WMA
GENERAL
Power Requirement Operating Voltage DC 14.4 V (11 V to 16 V allowance)
Grounding System Negative ground
Allowable Operating Temperature 0
Dimensions (W
Mass (approx.) 1.7 kg (excluding accessories)
• Design and specifications are subject to change without notice.
• Microsoft and Windows Media are either registered trademarks or trademarks of Microsoft Corporation in the United States and/or other countries.
× H × D) Installation Size (approx.) 182 mm × 52 mm × 159 mm
Panel Size (approx.) 188 mm
Ω (4 Ω to 8 Ω allowance)
Ω load (full scale)
Ω
(LW) 144 kHz to 279 kHz
µV/75 Ω)
µV/75 Ω)
µV
µV
°C to +40°C
× 58 mm × 12 mm
• SD logo is a trademark.
Ω, 40 Hz to 20 000 Hz at no more than 0.8% total
Ω, 40 Hz to 20 000 Hz at no more than 0.8% total
1-2 (No.MA157)
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.MA157)1-3
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.
CD mechanism assembly
Flexible wire
1-4 (No.MA157)
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.MA157)1-5
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.
1-6 (No.MA157)
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.
(2) Take out the front panel assembly.
3.1.2 Removing the heat sink
(See Fig.2)
(1) From the left side of the main body, remove the two screws
A and two screws B attaching the heat sink.
(2) Take out the heat sink.
Front panel assembly
Detach button
Fig.1
AAB
Heat sink
Fig.2
(No.MA157)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 C attaching the top chassis assembly to the bottom
chassis assembly. (See Fig.3)
(2) From the both and back sides of the main body, remove the
four screws D attaching the top chassis assembly to the
bottom chassis assembly. (See Figs.4 to 6)
(3) From the left side of the main body, remove the screw E at-
taching the top chassis assembly. (See Fig.5)
(4) Lift the top chassis assembly in the direction of the arrow,
and disconnect the connector CN501
nism assembly from the connector CN702
board. (See Figs.5 and 6)
(5) Take out the top chassis assembly from the bottom chassis
assembly.
on the CD mecha-
on the main
Bottom chassis assembly
C
C
Top chassis assembly
Fig.3
Top chassis assembly
Bottom chassis assembly
CD mechanism assembly
Top chassis assembly
Main board
Bottom chassis assembly
Top chassis assembly
Fig.4
E
Fig.5
D
D
CN501
D
CN702
D
1-8 (No.MA157)
Bottom chassis assembly
Rear bracket
Fig.6
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 F attaching the front chassis. (See Figs.7
and 8)
(2) Take out the front chassis forward.
3.1.5 Removing the CD mechanism assembly
(See Fig.9)
• Prior to performing the following procedures, remove the front
panel assembly, heat sink and top chassis assembly.
Reference:
Remove the front chassis as required.
(1) From the inside of the top chassis assembly, remove the
three screws G attaching the CD mechanism assembly.
Reference:
When attaching the screw G, attach it with the mecha
heat sink.
(2) Remove the mecha heat sink from the CD mechanism as-
sembly, and take out the CD mechanism assembly from
the top chassis.
Reference:
When attaching the mecha heat sink, pass the craws of it
through the slots a of CD mechanism assembly.
Top chassis assembly
F
Front chassis
Top chassis
Slots a
Front chassis
Fig.7
Top chassis assembly
Fig.8
Mecha heat sink
G
F
G GCD mechanism assembly
Fig.9
(No.MA157)1-9
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