JVC EXAD KD-NX901 User manual

SERVICE MANUAL
COPYRIGHT © 2005 Victor Company of Japan, Limited No.MA161
2005/6
HDD NAVIGATION / DVD RECEIVER
MA16120056
KD-NX901
Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)
TABLE OF CONTENTS
1 PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-26
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-33
Area suffix
E ------------- Southern Europe

1-2 (No.MA161)
SPECIFICATION
NAVIGATION SYSTEM
System & Service L1, C/A code
Global Positioning System
Standard Positioning Service
Reception System 15-channel multi-channel reception system
Reception Frequency 1 575.42 MHz
Sensitivity -130 dBm
Update Rate 1/second, continuous
GPS Antenna Polarization Right Handed Circular Polarization
Dimensions (approx.) 30.4 mm ×11.7 mm ×35.5 mm (W ×H ×D)
Cable (approx.) 5.0 m
Attachment mat size (approx.) 70 mm ×70 mm
AUDIO AMPLIFIER SECTION
Maximum Power Output Front 50 W per channel
Rear 50 W per channel
Continuous Power Output (RMS) Front 20 W per channel into 4 Ω, 40 Hz to 20 000 Hz at no more
than 0.8% total harmonic distortion.
Rear 20 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
Signal-to-Noise Ratio 70 dB
Audio output level Digital (DIGITAL OUT: Optical) Signal wave length: 660 nm
Output level: -21 dBm to -15 dBm
Line-Out Level/Impedance 2.0 V/20 kΩload (full scale) Output Impedance: 1 kΩ
Color system PAL
Video output (composite) 1 Vp-p/75 Ω
Other Terminals SUBWOOFER OUT,CD changer
Steering wheel remote input
TUNER SECTION
Frequency Range FM 87.5 MHz to 108.0 MHz
AM (MW) 522 kHz to 1 620 kHz
(LW) 144 kHz to 279 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 40 dB
Capture Ratio 1.5 dB
MW Tuner Sensitivity 20 µV
Selectivity 65 dB
LW Tuner Sensitivity 50 µV

(No.MA161)1-3
Design and specifications are subject to change without notice.
DVD/CD PLAYER SECTION
Signal Detection System Non-contact optical pickup (semiconductor laser)
Number of Channels 2 channels (stereo)
Frequency Response DVD, fs=48 kHz/96 kHz 16 Hz to 20 000 Hz
VCD/CD 16 Hz to 20 000 Hz
Dynamic Range 96 dB
Signal-to-Noise Ratio 98 dB
Wow and Flutter Less than measurable limit
MP3 (MPEG Audio Layer 3) Max. Bit Rate 320 Kbps
WMA (Windows Media Audio) Max. Bit Rate 192 Kbps
HDD/SD SECTION
MP3 (MPEG Audio Layer 3) Max. Bit Rate 320 kbps
WMA (Windows Media Audio) 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
Allowable Operating Altitude -300 m to +3000 m
Dimensions (W ×H ×D) Installation Size (approx.) 182 mm ×52 mm ×159 mm
Panel Size (approx.) 188 mm ×58 mm ×13 mm
Mass (approx.) 2.1 kg (excluding accessories)

1-4 (No.MA161)
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.

(No.MA161)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 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) Before disconnecting the flexible wire from the connector CN101 on the mechanism control board, solder the short-circuit points
on the flexible wire.
Caution:
If you do not follow this instruction, the DVD pickup may be damaged.
(2) Disconnect the flexible wire from the connector CN101 on the mechanism control board.
(3) Remove the solders from the short-circuit points on the flexible wire after replacing the DVD pickup.
(4) Connect the flexible wire to the connector CN101 on the mechanism control board.
1M
(caption)
Anti-static wrist strap
Conductive material
(conductive sheet) or iron plate
Mechanism control board
CN101
Flexible wire
Short-circuit points

1-6 (No.MA161)
1.4 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.
REPRODUCTION AND POSITION OF LABELS
!
Please use enough caution not to
see the beam directly or touch it
in case of an adjustment or operation
check.
WARNING LABEL
CAUTION : Visible and Invisible
laser radiation when open and
interlock failed or defeated.
AVOID DIRECT EXPOSURE TO
BEAM. (e)
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)
ADVARSEL : Synlig og usynlig
laserstråling når maskinen er
åben eller interlocken fejeler.
Undgå direkte eksponering til
stråling. (d)
CLASS 1
LASER PRODUCT

(No.MA161)1-7
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

1-8 (No.MA161)
SECTION 3
DISASSEMBLY
3.1 Main body section
3.1.1 Removing the front panel assembly
(See Fig1)
(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.MA161)1-9
3.1.3 Removing the top chassis assembly
(See Figs.3 to 6)
• Prior to performing the following procedure, remove the front
panel assembly, heat sink.
Reference:
Remove the front panel assembly as required.
(1) From the bottom side of the main body, remove the two
screws Cand screw Dattaching 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
six screws Eattaching the top chassis assembly to the bot-
tom chassis assembly. (See Figs.4 to 6)
(3) Lift the top chassis assembly in the direction of the arrow,
and disconnect top chassis assembly from the connector
CN601 on the main board. (See Figs.3 and 6)
(4) Take out the top chassis assembly from the bottom chassis
assembly.
Fig.3
Fig.4
Fig.5
Fig.6
C
Bottom chassis assembly
D
CN601
C
Bottom chassis assembly
Top chassis assembly
E
Top chassis assembly
E
Bottom chassis assembly
Main board
Top chassis assembly
Bottom chassis assembly
Rear bracket
E
E

1-10 (No.MA161)
3.1.4 Removing the front chassis assembly
(See Figs.7 to 9)
• 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 Fattaching the front chassis assembly.
(See Figs.7 and 8)
(2) From the front sides of the top chassis assembly, remove
the three screws Gattaching the front chassis assembly.
(See Fig.9)
(3) Take out the front chassis assembly from the top chassis.
Fig.7
Fig.8
Fig.9
Top chassis assembly
Front chassis
F
Top chassis assembly
Front chassis
F
Front chassis assembly
G

(No.MA161)1-11
3.1.5 Removing the CPU board
(See Figs.10 and 11)
• Prior to performing the following procedure, remove the front
panel assembly, heat sink and top chassis assembly.
(1) From the inside of the top chassis assembly, remove the
four screws Hattaching the CPU case (bottom). (See
Fig.10)
(2) Release the lock of the connector CN561 on the CPU
board, disconnect the card wire from the connector CN561.
(See Fig.11)
(3) Release the lock of the connector CN531 on the CPU
board, disconnect the card wire from the connector CN531.
(See Fig.11)
(4) Take out the CPU board from the top chassis assembly.
Fig.10
Fig.11
CPU case(botom)
H
H
CN531 CN561
CPU board

1-12 (No.MA161)
3.1.6 Removing the HDD
(See Fig.12)
• Prior to performing the following procedure, remove the front
panel assembly, heat sink and top chassis assembly.
(1) From the inside of the top chassis assembly, remove the
four screws Jattaching the HDD.
(2) Release the lock of the connector CN562 on the HDD, dis-
connect the card wire from the connector CN562.
(3) Take out the HDD from the top chassis assembly.
Fig.12
3.1.7 Removing the DVD
(See Fig.13)
• Prior to performing the following procedure, remove the front
panel assembly, heat sink, front chassis assembly and top
chassis assembly.
(1) From the inside of the top chassis assembly, remove the
three screws Kattaching the DVD.
(2) Take out the DVD from the top chassis assembly.
Fig.13
J
J
HDD
CN562
K
K
DVD

(No.MA161)1-13
3.1.8 Removing the main board
(See Figs.14 and 15)
• Prior to performing the following procedure, remove the front
panel assembly, heat sink and top chassis assembly.
(1) From the rear side of the bottom chassis assembly, remove
the screws Mand Nattaching the rear bracket to the bot-
tom chassis assembly. (See Fig.14)
(2) From the top side of the bottom chassis assembly, remove
the four screws Pattaching the main board to the bottom
chassis assembly. (See Fig.15)
(3) Release the stopper of the connector CN751 on the main
board in an upward direction, disconnect the card wire from
the connector CN751. (See Fig.15)
(4) Disconnect the wire from the connectors CN391 and
CN705 on the main board. (See Fig.15)
Reference:
After connecting the wires, fix the wires with the wire
holder.
(5) Take out the main board from the bottom chassis assem-
bly.
Fig.14
Fig.15
Rear bracket
MN
CN751
CN705
CN391 Main board
Wire holder
P

1-14 (No.MA161)
3.1.9 Removing the rear bracket
(See Figs.16 and 17)
• Prior to performing the following procedure, remove the front
panel assembly, heat sink, top chassis assembly and main
board.
(1) Remove the two screws Qattaching the wire holder to the
rear bracket. (Figs.16)
(2) From the rear side of the main board, remove the wires
from the rear bracket in the direction of the arrow. (See
Fig.17)
(3) Remove the two screws Rand screws Sand Uattaching
the rear bracket to the main board. (Figs.17)
(4) Remove the nut T attaching the GPS antenna terminal.
(See Fig.17)
(5) Disconnect the wire from the connector CN381 on the main
board. (See Fig.16)
(6) Take out the main board from the bottom chassis assem-
bly.
Fig.16
Fig.17
Main board
Q
CN381
Rear bracket
Wire holder
Rear bracket
Wire
R T
U
S

(No.MA161)1-15
3.1.10 Removing the gear bracket unit
(See Fig.18)
• Prior to performing the following procedure, 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 Vattaching the FPC guide.
(2) Remove the five screws Wattaching the gear bracket unit
to the bottom chassis.
Reference:
When attaching the screws Vand W, apply a locking
agent them.
(3) Take out the gear bracket unit from the bottom chassis.
Fig.18
V W
FPC guide
Bottom chassis Gear bracket unit
W

1-16 (No.MA161)
3.1.11 Removing the switch board
(See Figs.19 to 21)
• Prior to performing the following procedure, remove the front
panel assembly.
(1) From the rear side of the front panel assembly, remove the
five screws Xattaching the rear cover assembly to the front
panel assembly. (See Fig.19)
(2) Release the eight joints aof the front panel assembly and
remove the rear cover assembly. (See Fig.20)
(3) Take out the switch board from the front panel assembly.
(See Fig.21)
Caution:
Take care not to lose the spring.
Fig.19
Fig.20
Fig.21
X
X
X
Rear cover assembly
Joints a
Joints a
Joints a
Rear cover assembly
Switch board
Front panel assembly
Comp. spring

(No.MA161)1-17
3.2 DVD mechanism assembly
3.2.1 Removing the chassis assembly
(See Fig.1)
(1) Remove the screw Aattaching the lug wire.
(2) Remove the six screws Battaching the chassis assembly.
(3) Remove the chassis assembly.
Fig.1
3.2.2 Removing the mechanism control board
(See Fig.2)
Caution:
Before disconnecting the flexible wire extending from the DVD
pickup, solder the short-circuit point on the flexible wire using
a grounding soldering iron. If you do not follow this instruction,
the DVD pickup may be damaged.
(1) Turn over the body, and solder the short-circuit points on
the flexible wire extending from the DVD pickup.
(2) Disconnect the flexible wire from connector CN101 on the
mechanism control board.
(3) Disconnect the card wire from connector CN201 on the
mechanism control board.
(4) Disconnect the flexible wire from connector CN202 on the
mechanism control board.
(5) Unsolder two soldered points aon the mechanism control
board and remove the wire extending from the feed motor.
(6) Remove the two screws Cand screw Dattaching the
mechanism control board.
Caution:
• As the flexible wire to be connected to CN101, make sure to
attach it to the mechanism control board using a double
tape.
• After reassembling, unsolder the short-circuit points.
Fig.2
B
B
B
Chassis assembly
A
Double tape
Feed motor
Mechanism control board
CN202
CN101
C
a
D
C
CN401CN201
Flexible wire
Short-circuit points

1-18 (No.MA161)
3.2.3 Removing the top cover
(See Fig.3)
(1) Remove the two screws Eattaching the top cover on the
back of the body.
(2) Remove the top cover upward.
Reference:
When reassembling, set part bof the top cover under the
bending part cof the chassis frame.
3.2.4 Removing the mechanism section
(See Figs.3 to 5)
• Remove the top cover.
(1) From the bottom of the body, remove the screw Eattaching
the lug wire. (See Fig.3)
(2) Remove the two screws Fattaching the right and left stop-
pers on the front side. (See Fig.3)
(3) Remove the two floating springs on the bottom of the body.
(See Fig.4)
(4) Move the mechanism section upward and remove from the
chassis frame.
The three damper springs come off from the dampers.
(See Fig.5)
Caution:
• When reassembling, reattach the damper spring to the
damper respectively and insert the three shafts on the bot-
tom of the mechanism to the dampers.
• Before inserting the shaft to the dampers, apply IPA to the
hole of damper.
Fig.3
Fig.4
Fig.5
E
Top cover
Stopper
Stopper
F
F
b
c
E
Floating spring
Mechanism section
Damper (R)
(Purple)
Damper (F)
(Black)
Damper (F)
(Black)
Chassis frame
Damper SP.(F)
(Silver)
Damper SP.(F)
(Silver)
Damper SP.(R)
(Red)

(No.MA161)1-19
3.2.5 Removing the clamper unit
(See Figs. 6 to 10)
• Remove the top cover and the mechanism section.
(1) Remove the clamper2 spring on the bottom of the mecha-
nism section. (See Figs.6.and 10)
(2) Release the part dof the clamper spring from the bending
part of the chassis base assembly. (See Fig.8)
(3) Move the clamper unit in the direction of the arrow and turn.
Release the two joints eand f, then remove the clamper
unit upward. (See Fig.6)
3.2.6 Reattaching the clamper unit
(See Figs. 6 to 10)
(1) Attach the clamper spring to the clamper unit. (See Fig.9)
(2) Move the clamper unit to set the side joints eand fto each
boss of the chassis base assembly. Make sure that part g
is inserted to the notch of the chassis base assembly. (See
Figs.6 and 10)
(3) Move the part dof the clamper spring to the outside of the
bending part of the chassis base assembly. (See Fig.8)
(4) Attach the clamper2 spring to the chassis base assembly.
(See Figs.6 and 7)
Caution:
When reattaching, temporarily hook the end of the clamper
spring as shown in the figure to make the work easy. (See
Fig.9)
Fig.6
Fig.7
Clamper unit
Clamper spring
Clamper2 spring
g
f
e
Chassis base assembly
Clamper2 spring
Chassis base assembly

1-20 (No.MA161)
Fig.8
Fig.9
Fig.10
Clamper spring
Chassis base assembly
d
Clamper unit
Clamper spring
Notch
g
Clamper unit