JVC NX-CDR7R User manual

COMPACT COMPONENT CDR SYSTEM
NX-CDR7R
NX-CDR7R
Area suffix
B ------------------------------- U.K.
E ----------- Continental Europe
EN ------------ Northern Europe
No.21030
Oct. 2001
COPYRIGHT 2001 VICTOR COMPANY OF JAPAN, LTD.
CA-NXCDR7R
SP-NXCDR7 SP-NXCDR7
Contents
Safety Precautions
Preventing static electricity
Important for laser products
Disassembly method
Adjustment method
Confirm method of operation
Flow of functional operation until
TOC read
Maintenance of laser pickup
Replacement of laser pickup
Description of major ICs
1-2
1-3
1-4
1-5
1-29
1-30
1-32
1-33
1-33
1-34~50
SERVICE MANUAL

NX-CDR7R
1-2
1. This design of this product contains special hardware and many circuits and components specially for safety
purposes. For continued protection, no changes should be made to the original design unless authorized in
writing by the manufacturer. Replacement parts must be identical to those used in the original circuits. Services
should be performed by qualified personnel only.
2. Alterations of the design or circuitry of the product should not be made. Any design alterations of the product
should not be made. Any design alterations or additions will void the manufacturer`s warranty and will further
relieve the manufacture of responsibility for personal injury or property damage resulting therefrom.
3. Many electrical and mechanical parts in the products have special safety-related characteristics. These
characteristics are often not evident from visual inspection nor can the protection afforded by them necessarily
be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which
have these special safety characteristics are identified in the Parts List of Service Manual. Electrical
components having such features are identified by shading on the schematics and by ( ) on the Parts List in
the Service Manual.The use of a substitute replacement which does not have the same safety characteristics
as the recommended replacement parts shown in the Parts List of Service Manual may create shock, fire, or
other hazards.
4. The leads in the products are routed and dressed with ties, clamps, tubings, barriers and the like to be
separated from live parts, high temperature parts, moving parts and/or sharp edges for the prevention of
electric shock and fire hazard. When service is required, the original lead routing and dress should be
observed, and it should be confirmed that they have been returned to normal, after re-assembling.
5. Leakage currnet check (Electrical shock hazard testing)
After re-assembling the product, always perform an isolation check on the exposed metal parts of the product
(antenna terminals, knobs, metal cabinet, screw heads, headphone jack, control shafts, etc.) to be sure the
product is safe to operate without danger of electrical shock.
Do not use a line isolation transformer during this check.
Plug the AC line cord directly into the AC outlet. Using a "Leakage Current Tester", measure the leakage
current from each exposed metal parts of the cabinet, particularly any exposed metal part having a return
path to the chassis, to a known good earth ground. Any leakage current must not exceed 0.5mA AC (r.m.s.).
Alternate check method
Plug the AC line cord directly into the AC outlet. Use an AC voltmeter having, 1,000 ohms per volt or more
sensitivity in the following manner. Connect a 1,500 10W resistor paralleled by a 0.15 F AC-type capacitor
between an exposed metal part and a known good earth ground.
Measure the AC voltage across the resistor with the AC
voltmeter.
Move the resistor connection to each exposed metal part,
particularly any exposed metal part having a return path to
the chassis, and meausre the AC voltage across the resistor.
Now, reverse the plug in the AC outlet and repeat each
measurement.Voltage measured any must not exceed 0.75 V
AC (r.m.s.).This corresponds to 0.5 mA AC (r.m.s.).
1.This equipment has been designed and manufactured to meet international safety standards.
2. It is the legal responsibility of the repairer to ensure that these safety standards are maintained.
3. Repairs must be made in accordance with the relevant safety standards.
4. It is essential that safety critical components are replaced by approved parts.
5. If mains voltage selector is provided, check setting for local voltage.
Good earth ground
Place this
probe on
each exposed
metal part.
AC VOLTMETER
(Having 1000
ohms/volts,
or more sensitivity)
1500 10W
0.15 F AC TYPE
!
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.
In regard with component parts appearing on the silk-screen printed side (parts side) of the PWB diagrams, the
parts that are printed over with black such as the resistor ( ), diode ( ) and ICP ( ) or identified by the " "
mark nearby are critical for safety.
When replacing them, be sure to use the parts of the same type and rating as specified by the manufacturer.
(Except the J and C version)

NX-CDR7R
1-3
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.
1.1. Grounding to prevent damage by static electricity
Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as DVD players.
Be careful to use proper grounding in the area where repairs are being performed.
1.1.1. Ground the workbench
1. 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.
1.1.2. Ground yourself
1. Use an anti-static wrist strap to release any static electricity built up in your body.
1.1.3. Handling the optical pickup
1. 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 next page.)
2. 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.
1.2. 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. For specific details, refer to the replacement procedure in the text.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
Conductive material
(conductive sheet) or iron plate
(caption)
Anti-static wrist strap

NX-CDR7R
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 compact disc player uses invisible
laserradiation and is equipped with safety switches
whichprevent emission of radiation when the drawer is
open and the safety interlocks have failed or are de
feated. 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 herein may result in
hazardous radiation exposure.
VARNING : Osynlig laserstrålning är denna del är öppnad
och spårren är urkopplad. Betrakta ej strålen.
VARO : Avattaessa ja suojalukitus ohitettaessa olet
alttiina näkymättömälle lasersäteilylle.Älä katso
säteeseen.
ADVARSEL : Usynlig laserstråling ved åbning , når
sikkerhedsafbrydere er ude af funktion. Undgå
udsættelse for stråling.
ADVARSEL : Usynlig laserstråling ved åpning,når
sikkerhetsbryteren er avslott. unngå utsettelse
for stråling.
REPRODUCTION AND POSITION OF LABELS
WARNING LABEL
CLASS 1
LASER PRODUCT
!
CAUTION
Please use enough caution not to
see the beam directly or touch it
in case of an adjustment or operation
check.
CLASS 1
LASER PRODUCT

NX-CDR7R
1-5
Remove the four screws Aon the back of the body.
Remove the screw Bon each side of the body.
Remove the rear part of the metal cover upward
while pulling the lower part of both sides.
1.
2.
3.
Disassembly method
<Main body>
Removing the metal cover
(See Fig.1 and 2)
Fig.1
Fig.2
A
A
B 2
Metal cover
Metal cover
B 2

NX-CDR7R
1-6
Prior to performing the following procedure, remove
the metal cover.
Disconnect the card wire from connector CN705,
CN708, CN704 and CN712 on the main board.
Disconnect the wire from connector CN905 on the
power board.
Remove the two screws Con each side of the body.
Remove the two screws Don the bottom of the
body.
Disengage the joint aon the bottom and the two
joints bon the lower side of the body using a
screwdriver. Then remove the front panel assembly
toward the front.
1.
2.
3.
4.
5.
Removing the front panel assembly
(See Fig.3 to 6)
Fig.3
Fig.4
Fig.5Fig.6
Front panel assemblyCN704 CN712
CN705
CN708
Main board
Power board
CN905
Main board
Front panel assembly
Joint b
C
CN705
Main board
CN708
Joint b
C
D
Front panel assembly
Front panel assembly
Joint a

NX-CDR7R
1-7
Prior to performing the following procedure, remove
the metal cover.
Disconnect the card wire from connector CN704,
CN705, CN706, CN707, CN708, CN709 and CN712
on the main board on the upper side of body.
Remove the two screws Eon the upper side of the
body.
Disconnect connector CN701, CN702, CN703,
CN710, CN711 on the main board from other boards
respectively.
1.
2.
3.
Removing the main board
(See Fig.7 and 8)
Fig.7
Fig.8
CN711
CN704
CN708
Main board
E
Front panel assembly
CN705
CN710
CN709
CN712
CN702
CN703
CN701
CN707
CN706
EMain board
CN711
CN710
CN702
CN703
CN701
Front panel assembly
CN706
CN707

NX-CDR7R
1-8
Prior to performing the following procedure, remove
the metal cover.
Remove the four screws Fon the back of the body,
and press the two joints cinward to release.
Remove the thirteen screws Gattaching the rear
panel.
Disengage the two joints din the lower part of the
rear panel using a screwdriver.
1.
2.
3.
Removing the rear cover / rear panel
(See Fig.9 to 12)
Fig.9
Fig.10
Fig.11Fig.12
F
F
Joint c
Joint c
Rear cover
G
GG
G
G
G
Rear panel
Rear panel
Joint d
Rear panel
Joint d

NX-CDR7R
1-9
Prior to performing the following procedure, remove
the metal cover, the main board and the rear panel.
Disconnect the wire from connector CN802 on the
tuner board on the right side of the body.
Remove the screw Hattaching the tuner board.
Move the tuner board upward and outward to
disengage the tuner board from the base chassis at
the joint f, and from the power board at the joint e.
1.
2.
3.
Removing the tuner board (See Fig.13)
Prior to performing the following procedure, remove
the metal cover, the main board and the rear panel.
Remove the band attaching the wire to the power
board on the back of the body.
Disconnect the wire from connector CN901, CN904
and CN905 on the power board.
Remove the screw Ion the left side of the body.
Disconnect connector CN902 and CN903 on the
power board from the power board, and move the
power board upward to disengage it from the base
chassis at the joint g.
1.
2.
3.
4.
Removing the power board
(See Fig.14 and 15)
Fig.13
Fig.14
Fig.15
H
Joint f
Joint e
Tuner board
CN802
Power board
Tuner board
Band
CN904
CN901
Power board
CN903
CN905 CN902
Band
CN904
CN901
IJoint g

NX-CDR7R
1-10
Prior to performing the following procedure, remove
the metal cover, the main board, the rear panel and
the tuner board.
Disconnect the wire from connector CN403 on the
power amplifier board 2.
As the wire extending from the fan, take it off the notch
hin the lower part of the power amplifier board 2.
Disconnect connector CN101 and CN103 on the
power amplifier board 1, and CN402 and CN405 on
the power amplifier board 2 from the power board
respectively. The heat sink is still attached to the
power amplifier board 1 and the power amplifier
board 2.
Remove the two screws Jattaching the IC bracket
(1) on the back of the heat sink, and remove the
power amplifier 1.
Remove the three screws Kattaching the IC bracket
(2) on the back of the heat sink, and remove the
power amplifier 2.
1.
2.
3.
4.
5.
Removing the power amplifier board 1 /
power amplifier board 2 / heat sink
(See Fig.16 to 19)
Fig.16
Fig.17
Fig.18Fig.19
J
J
Notch h
Power amplifier board 2
CN403
Power amplifier board 1
CN101 Power board
CN402
Power amplifier board 2
CN405
CN103
Heat sink
Power amplifier board 2
Heat sink
Power amplifier board 2
Power amplifier board 1
Heat sink
IC bracket (1)
K
K
Power amplifier board 2 Power amplifier board 1
Heat sink
IC bracket (2)

NX-CDR7R
1-11
Prior to performing the following procedure, remove
the metal cover, the main board, the rear panel, the
tuner board, the power amplifier board 1, the power
amplifier board 2 and the heat sink.
Removing the fan (See Fig.20)
Prior to performing the following procedure, remove
the metal cover, the main board, the rear panel, the
tuner board, the power amplifier board 1, the power
amplifier board 2 and the heat sink.
Disconnect the wire from connector CN203 and
CN210 on the power board on the back of the body.
Remove the two screws Mattaching the power
board.
Disconnect connector CN204 and CN207 on the
power board from the power board.
1.
2.
3.
Removing the power board (See Fig.21)
Disconnect the wire from connector CN210 on the
power board.
Remove the two screws Lattaching the fan.
Push down the clamp which settles the wire
extending from the power transformer, in the
direction of the arrow, and remove the fan backward.
1.
2.
3.
The fan is detachable without removing
the CDR mechanism assembly.
REFERENCE:
Fig.20
Fig.21
L
L
Power board
CN210
Clamp
Fan
M
Power board
CN204 CN207
Power board
CN203
CN210

NX-CDR7R
1-12
Prior to performing the following procedure, remove
the metal cover, the front panel assembly, the rear
panel, the main board and the tuner board.
Removing the CDR mechanism cover /
CDR mechanism assembly
(See Fig.22 to 27)
Remove the spacer settling the card wire on the right
side of the body and release the wire from the clamp
and the notch iof the power board on the upper side
of the body. Disconnect the card wire from connector
CN702 and CN703 on the CDR connection board.
Disconnect the wire from connector CN507 on the
CD servo board.
Disconnect the wire from connector CN210 on the
power board on the back of the body and release the
wire from the notch hof the power amplifier board 2.
Remove the four screws Non the upper front side of
the body and remove the CDR mechanism cover
toward the front. The CDR mechanism assembly and
the fan are also removed with the CDR mechanism
cover.
1.
2.
3.
4.
When removing the CDR mechanism
assembly only, refer to the next section.
REFERENCE:
When removing the fan only, refer to
“Removing the fan”.
REFERENCE:
Fig.22
Fig.23
Fig.24
Clamp Notch i
CD servo board
CN507
CDR connection board
CN702
CDR mechanism cover
CDR connection board
CN703
CDR mechanism cover
N
N
Clamp
Notch i
Power amplifier board 2
Notch h

NX-CDR7R
1-13
Remove the three screws Oattaching the CDR
mechanism cover. Move the CDR mechanism
assembly in the direction of the arrow, inside of the
CDR mechanism cover, to disengage it from the
three joint bosses marked j. Then remove the CDR
mechanism assembly toward the front.
5.
When reassembling, set the wire extending
from the rear of the CDR mechanism board
on the side of the CDR mechanism cover
(marked k) as shown in Fig.26 before
reattaching the CDR mechanism assembly.
CAUTION:
Fig.26
Fig.27
O
O
Fan
Joint bosses j
Joint bosses j
Joint bosses j
CDR mechanism cover
k
Joint bosses j
Joint bosses j
Joint bosses j
k
Fig.25
CDR mechanism cover
O

NX-CDR7R
1-14
Prior to performing the following procedure, remove
the metal cover, the front panel assembly and the
main board.
Disconnect the card wire from connector CN702 and
CN703 on the CDR connection board on the right
side of the body.
Disconnect the wire from connector CN507 on the
CD servo board.
Remove the three screws Oon the upper side of the
body.
Move the CDR mechanism assembly in the direction
of the arrow, inside of the CDR mechanism cover, to
disengage it from the three joint bosses marked j.
Then pull out the CDR mechanism assembly toward
the front (See Fig. 25 to 27).
1.
2.
3.
4.
Prior to performing the following procedure, remove
the metal cover, the front panel assembly, the main
board, the rear panel, the tuner
board and the CDR
mechanism cover.
Disconnect the card wire from connector CN504 and
CN505 on the CD servo
board on the upper side of
the body.
Disconnect the wire from connector CN403 on the
power
board.
Remove the two screws Pand move the CD servo
board in the direction of the arrow to release the two
joints l.
1.
2.
3.
The CDR mechanism assembly is
detachable without removing the CDR
mechanism cover.
REFERENCE:
When reassembling, set the wire extending
from the back of the CDR mechanism board
on the side of the CDR mechanism cover
(marked k) as shown in Fig.26 before
reattaching the CDR mechanism assembly.
CAUTION:
Removing the CDR mechanism
assembly only (See Fig.28 and 29)
Removing the CD servo board
(See Fig.30)
Fig.28
Fig.29
Fig.30
CDR mechanism cover
O
CDR mechanism assembly
O
O
CDR mechanism assembly
CDR connection board
CN703 CN702
Joint bosses j 3 CD servo board
CN507
Joints l
CD servo board
P
P
CN504
CN505

NX-CDR7R
1-15
Prior to performing the following procedure, remove
the metal cover, the front panel assembly and the
main board.
Disconnect the card wire from connector CN606,
CN608, CN651 on the CD changer mechanism
board on the right side of the body.
Remove the four screws Qattaching the CD
changer mechanism assembly on the upper side of
the body.
Move the CD changer mechanism assembly in the
direction of the arrow, inside of the CD changer
mechanism cover, and pull out it toward the front
while raising it slightly.
1.
2.
3.
The CD changer mechanism assembly is
detachable without removing the CDR
mechanism cover and the CDR
mechanism assembly.
REFERENCE:
Removing the CD changer mechanism
assembly (See Fig.31 to 33)
Fig.31
Fig.32
Fig.33
Q
CDR mechanism assembly
CD changer
mechanism assembly Q
CN608
CD changer mechanism board
CN606
CN651
Q
Q
CDR mechanism assembly
CD changer
mechanism assembly
QQ

NX-CDR7R
1-16
Prior to performing the following procedure, remove
the metal cover, the main board, the rear panel, the
tuner board, the power amplifier board 1, the power
board and the heat sink.
Remove the band setling the wire on the power
board on the back of the body and disconnect the
wire from connector CN904.
Disconnect the wire from connector CN203 on the
power board.
Remove the four screws Ron the upper side of the
body, and remove the power transformer assembly
from under the heat sink backward.
1.
2.
3.
Removing the power transformer
assembly (See Fig.34 and 35)
Power board
CN904
Band
Fig.34
Fig.35
Power board
CN203
Power transformer assembly
R
R
Power board
CN203
Power transformer assembly
Power board

NX-CDR7R
1-17
Remove the four screws S on the back of the front
panel assembly.
1.
<Front panel assembly section>
Removing the LCD board (See Fig.36)
Remove the seven screws T.
Disconnect the card wire from connector CN671 and
CN672 on the function switch board.
1.
2.
Removing the function switch board
(See Fig.37)
Remove the screw Uattaching the presser board of
the phone jack board.
Remove the screw V attaching the earth terminal
extending from the phone jack board.
1.
2.
Removing the phone jack board
(See Fig.38)
Disconnect the wire from connector CN582 on the
OPEN / CLOSE SW detect board.
Disconnect the wire from connector CN583 on the
motor board.
Remove the screw W.
1.
2.
3.
Removing the motor board (See Fig.39)
Disconnect the wire from connector CN582 on the
OPEN / CLOSE SW detect board.
Remove the two screws X.
1.
2.
Removing the OPEN / CLOSE SW detect
board (See Fig.39)
When reconnecting each card wire, let it
through the three notches mof the as
shown in Fig.37.
CAUTION:
Prior to performing the following procedures, remove
the metal cover and the front panel assembly.
Fig.36
Fig.37
Fig.38
Fig.39
S
S
LCD board
Function switch
board
Motor board
Phone jack board
Notches m
TT
Function switch board
V
UPresser board
Phone jack board
X
OPEN / CLOSE SW detect board
CN582
Motor board
CN583 W

NX-CDR7R
1-18
Prior to performing the following procedure, remove
the motor board.
Remove the belt from the door motor.
Remove the screw Yattaching the door motor
bracket.
Remove the two screws Z.
1.
2.
3.
Removing the door motor
(See Fig.40 and 41)
Fig.40
Fig.41
YDoor motor
Door motor bracket Belt
Door motor
Door motor bracket
Z

NX-CDR7R
1-19
Prior to performing the following procedure, remove
the function switch board, the motor board and the
belt.
Remove the belt. Rotate the pulley (1) and move the
control panel assembly toward the front until it stops.
Remove the control panel assembly toward the front
while pulling out the two shafts of the joint lon the
right and left sides of the control panel assembly.
1.
2.
Put the front panel assembly down toward the front,
and release the four joint mand ninside of the
control panel by pressing them inward.
Remove the four screws Z' attaching the control
board.
3.
4.
Removing the control board
(See Fig.42 to 46)
Each shaft of the joint lis attached a
collar. Be careful not to lose that.
CAUTION:
Fig.42
Fig.43
Fig.44
Fig.45
Fig.46
Z'Z'
Pulley (1)
Joint l Joint l
Control panel assembly
Control panel assembly
Collar
Collar
Joint m
Joint n
Joint m
Joint n
Control board
Arm bracket
Control board

NX-CDR7R
1-20
Insert a screwdriver into the sub chassis slot on the
back of the body and push the slider (R) toward the
front.
From the top of the body, slide the hook and the
slider (R) forward until they stop.
From the right side of the body, slide the slide cam
(L) backward until it stops. The sub chassis unit will
move to the lowest position.
From the bottom of the body, unsolder each soldered
part aand bof the motors on the servo control
board.
Remove the five screws Aattaching the servo
control board.
Disconnect connector CN610 on the servo control
board from the tray select switch board to suspend
the servo control board tentatively. Solder the part c
of the flexible wire connected to connector CN601 on
the underside of the servo control board.
Disconnect the flexible wire from connector CN601
and remove the servo control board from the body.
1.
2.
3.
4.
5.
6.
7.
Removing the servo control board
(See Fig.1 to 4)
In case of disconnecting the flexible
wire without soldering, the CD pick up
may be damaged.
ATTENTION:
When reassembling, make sure the
cam switch boss of the servo control
board is fitted to the slot pof the
control cam on the bottom of the body
(Refer to Fig.3-1).
ATTENTION:
Make sure the sub chassis unit is
locating at the lowest position. If
not,perform the following procedure
from 1 to 3.
ATTENTION:
Fig.1
Fig.2
Fig.3-1
Fig.4Fig.3-2
Slot
Slide cam (L)
Slider (R)
Sub chassis unit
Slide cam (L)
Hook
A
Tray select switch board
Solder part a
A
CN610
Solder
part b
A
CN601
A
Servo
control board
A
Cam switch
Cam switch boss
Main board
Slot p
Control cam Servo control board
CN601
Solder part c
Gear base unit
<Changer mechanism assembly>