Jvc KD-S723-R, KD-S721-R Service Manual
KD-S723R/KD-S721R
SERVICE MANUAL
CD RECEIVER
KD-S723R/KD-S721R
KD-S723R
TP/PTY
SEL
DISP
87 9
10 11
KD-S721R
TP/PTY
SEL
DISP
87 9
10 11
Difference point
KD-S723R LCD Color,Button Illumination--- Amber
KD-S721R LCD Color,Button Illumonation--- Green
Contents
FM
¢
CD
4
RNDRPTMO
12
RNDRPTMO
12
AM
SCMMODE
COMPACT
DIGITAL AUDIO
FM
¢
CD
4
AM
SCMMODE
Area Suffix
E -------- Continental Europe
EX ------------ Central Europe
Safety precaution
Preventing static electricity
Important for laser products
Location of main parts
Disassembly method
COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD.
1-2
1-3
1-4
1-5
1-6
Adjustment method
Flow of functional
operation unit TOC read
Maintenance of laser pickup
Replacement of laser pickup
Description of major ICs
1-11
1-12
1-14
1-14
1-15
No.49693
Feb. 2002
KD-S723R/KD-S721R
Safety precaution
!
!
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.
1-2
KD-S723R/KD-S721R
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.
(caption)
Anti-static wrist strap
Conductive material
(conductive sheet) or iron plate
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 text.)
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. 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
Short circuit land
FD screw
Feed motor ass’y
Shorting
FD gear
Pickup unit
1-3
KD-S723R/KD-S721R
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.
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.
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.
CAUTION
!
Please use enough caution not to
see the beam directly or touch it
in case of an adjustment or operation
check.
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
DANGER : Invisibie laser
radiation when open and
interlock or defeated.
AVOID DIRECT EXPOSURE
TO BEAM (e)
ADVARSEL :Usynlig laserstråling ved åbning , når
sikkerhedsafbrydere er ude
af funktion. Undgå udsæt
telse for stråling. (f)
VARNING : Osynlig laserstrålning är denna del
är öppnad och spårren är
urkopplad. Betrakta ej
strålen. (s)
VARO : Avattaessa ja suojalukitus ohitettaessa olet
alttiina näkymättömälle
lasersäteilylle.Älä katso
säteeseen. (d)
1-4
Location of main parts
Control unit
Display
Main unit
KD-S723R/KD-S721R
LED & key control board
Main board
CD mechanism
Power IC
Mechanism relay board
ISO connector
Main board
Loading motor
Antenna jack
Tuner
pack
Connector to controller
Damper
Pickup unit
Spindle motor
Feed motor
Damper
1-5
KD-S723R/KD-S721R
Disassembly method
Removing the front panel unit
(See Fig.1)
1. Press the release button and remove the front
panel unit in the direction of the arrow.
Fig.1
Removing the front chassis (See Fig.2)
1. Insert a screwdriver to the joints a on the side of the
front chassis and two joints b on the right side, then
detach the front chassis toward the front side.
Removing the heat sink (See Fig.3)
1. Remove the three screws A attaching the heat sink
on the left side of the body, and remove the heat
sink.
A
a
a
Front chassis
Fig.2
A
Fig. 3
b
b
A
Heat sink
Removing the bottom cover (See Fig.4)
1.2.Turn the body upside down.
Insert a screwdriver to the two joints c and two
joints d on both sides of the body and the joint e on
the back of the body, then detach the bottom cover
from the body.
1-6
Bottom cover
c
d
e
Fig. 4
KD-S723R/KD-S721R
Removing the main amplifier board
(See Fig.5 and 6)
1.
Remove the front chassis.
2.
Remove the bottom cover.
3.
Remove the two screws B attaching the main
amplifier board assembly on the bottom of the body.
4.
Remove the three screws C attaching the main
amplifier board assembly on the back of the body.
5.
Disconnect connector CN501 on the main amplifier
board assembly from the CD mechanism assembly.
Main amplifier board
B
C
CN501
B
Fig.5
C
C
Fig. 6
Removing the CD mechanism assembly
(See Fig.7)
1.
Remove the front chassis.
2.
Remove the bottom cover.
3.
Remove the main amplifier board assembly.
4.
Remove the three screws D attaching the CD
mechanism assembly from the top cover.
Removing the control switch board
(See Fig.8 and 9)
1.
Remove the front chassis.
2.
Remove the four screws E attaching the rear cover
on the back of the front panel unit.
3.
Remove the control switch board from the front
panel unit.
CD mechanism assembly
Top cover
D
E
E
D
Fig. 7
E
Fig. 8
Control switch board
D
E
Fig. 9
1-7
KD-S723R/KD-S721R
<CD mechanism section>
Removing the CD mechanism control
board (See Fig.1 and 2)
1.
Unsolder the part a and b on the CD mechanism
control board.
2.
Remove the stator fixing the CD mechanism control
board and the damper bracket (To remove the stator
smoothly, pick up the center part).
3.
Remove the screw A attaching the CD mechanism
control board.
4.
Remove the CD mechanism control board in the
direction of the arrow while releasing it from the two
damper bracket slots d and the front bracket slot e.
5.
Disconnect the flexible wire from connector on the
pickup unit.
ATTENTION:
Turn the FD gear in the direction of the
arrow to move the entire pickup unit to
the appropriate position where the
flexible wire of the CD mechanism unit
can be disconnected easily.
(Refer to Fig.2)
CD mechanism assembly
D
h
Front bracket
Pickup unit
Damper bracket
D
A
Fig.1
e
b
Flexible wire
a
h
c
D
d
CD mechanism
control board
Shift the lock
Removing the loading motor
(See Fig.3 to 5)
Prior to performing the following procedure, remove
the CD mechanism control board.
1.
Remove the two springs f attaching the CD
mechanism assembly and the front bracket.
2.
Remove the two screws B and the front bracket
while pulling the flame outward.
3.
Remove the belt and the screw C from the loading
motor.
Loading motor
C
FD gear
f
B
Loading motor
Pull outward
Fig.2
CD mechanism control board
f
B
Front bracket
Fig.3
Front bracket
Pull outward
1-8
Fig.5
Belt
Flame
Fig.4
KD-S723R/KD-S721R
Removing the CD mechanism assembly
(See Fig.1, 6 to 9)
Prior to performing the following procedure, remove
the CD mechanism control board and the front
bracket (loading motor).
1.
Remove the three screws D and the damper
bracket.
2.
Raise the both sides fix arms and move the fix plates
in the direction of the arrow to place the four shafts g
as shown in Fig.8 and 9.
3.
Remove the CD mechanism assembly and the two
springs h attaching the flame.
4.
Remove the two screws E and both sides rear
damper brackets from the dampers. Detach the CD
mechanism assembly from the left side to the right
side.
ATTENTION:
The CD mechanism assembly can be
removed if only the rear damper
bracket on the left side is removed.
CD mechanism
h
Front bracket
CD mechanism
D
Flame
assembly
D
assembly
h
D
Damper bracket
D
A
Fig.5
e
b
Damper bracket
D
Fig.6
a
h
c
D
d
CD mechanism
control board
h
Fix plate (L)
g
Fix arm (R)
D
Fig.7
Rear damper bracket
g
Fig.8
Rear damper bracket
E
Fix plate(R)
E
Fix arm (L)
Damper
Damper
g
g
Fig.9
1-9
KD-S723R/KD-S721R
Removing the feed motor assembly
(See Fig.10)
Prior to performing the following procedure, remove
the CD mechanism control board, the front bracket
(loading motor) and the CD mechanism assembly.
1.
Remove the two screws F and the feed motor
assembly.
Removing the pickup unit
(See Fig.10 and 11)
Prior to performing the following procedure, remove
the CD mechanism control board, the front bracket
(loading motor), the CD mechanism assembly and
the feed motor assembly.
1.
Detach the FD gear part of the pickup unit upward.
Then remove the pickup unit while pulling out the
part i of the FD screw.
Feed motor assembly
F
FD gear
Nut push spring plate
FD screw
Pickup unit
Fig.10
Part i
Part j
Pickup unit
G
Pickup mount nut
Pickup unit
ATTENTION:
2.
Remove the screw G attaching the nut push spring
plate and the pickup mount nut from the pickup unit.
Pull out the FD screw.
When reattaching the pickup unit,
reattach the part j of the pickup unit,
then the part i of the FD screw.
Removing the spindle motor
(See Fig.12 and 13)
Prior to performing the following procedure, remove
the CD mechanism control board, the front bracket
(loading motor), the CD mechanism assembly and
the feed motor assembly.
1.
Turn up the CD mechanism assembly and remove
the two springs k on both sides of the clamper arms.
Open the clamper arm upward.
2.
Turn the turn table, and remove the two screws H
and the spindle motor.
k
FD screw
Spindle motor
Fig.11
k
Fig.12
H
1-10
H
Fig.13
Adjustment method
KD-S723R/KD-S721R
Test instruments required for adjustment
1. Digital oscilloscope (100MHz)
2. AM Standard signal generator
3. FM Standard signal generator
4. Stereo modulator
5. Electric voltmeter
6. Digital tester
7. Tracking offset meter
8. Test Disc JVC :CTS-1000
9. Extension cable for check
EXTGS004-26P 1
Standard measuring conditions
Power supply voltage DC14.4V(10.5~16V)
Load impedance 4 (4 to 8 allowance)
Output Level Line out 2.0V / 20 k (Vol. MAX)
How to connect the extension cable for adjusting
Standard volume position
Balance and Bass &Treble volume : lndication"0"
Loudness : OFF
BBE : OFF
Frequency Band
FM 87.5MHz ~ 108.0MHz
MW 522kHz ~ 1620 kHz
LW 144kHz ~ 279kHz
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 antenna input.The loss of 6dB need not be considered
since direct reading of figures are applied in this working
standard.
EXTGS004-26P
1-11
KD-S723R/KD-S721R
Flow of functional operation until TOC read
Power ON
• When the pickup correctly moves
to the inner area of the disc
Set Function to CD
• When the laser diode correctly
emits
Microprocessor
commands
FMO
TC9462 "53"
FEED MOTOR
+TERMINAL
TERMINAL
IC501 "10"
REST SW
• When correctly focused
FEO
Focus Servo Loop ON
Disc inserted
Pickup feed to the inner area
Laser emitted
Focus search
Disc rotates
RF signal eye-pattern
remains closed
Tracking loop closed
RF signal eye-pattern
opens
TOC readout
YES
YES
Microprocessor
commands
1
"No disc"
display
• When the disc correctly rotates
Microprocessor
commands
Spindle
motor (-)
IC501 "7"
AccelerationAcceleration
0.5 Sec
Rough
Servo
0.5 Sec
Servo CLV
1-12
Jump to the first track
Play
Tracking Servo Loop ON
• RF signal
Rough Servo Mode
CLV Servo Mode
(ProgramArea)
CLV Servo Mode
(Lead-In Area;
Digital: 0)
Feed Section
Is the voltage output at
IC541 pin "53" 5V or 0V?
YES
Is 4V present at both
sides of the feed motor?
YES
NO
Is the wiring for IC541
(90) ~ (100) correct?
NO
Is 6V or 2V present at
IC501 "10" and "11"?
NO
YES
YES
Is 5V present at IC501
pin "20"?
YES
Check the vicinity of
IC541.
Check the feed motor
connection wiring.
KD-S723R/KD-S721R
NONO
Check CD 9V
and 5V.
Check the feed motor.
Focus Section
When the lens is
moving:
4V
Does the S-search
waveform appear at
IC501 pins "6" and "7"?
Spindle Section
Is the disk rotated?
YES
Does the RF signal
appear at TP1?
YES
Is the RF waveform at TP1
distorted?
YES
Check IC501.
NO
YES
NO
NO
NO
Check the circuits in
the vicinity of IC501
pins "14" ~ "18".
Check the pickup and
its connections.
Is 4V present at IC501
pins "8" and "9" ?
Check the spindle motor
and its wiring.
Check the circuits in the
vicinity of IC521 "2" ~ "7",
"18"~"24" or the pickup
YES
YES
NO NO
Is 4V present at IC541
pin "55" ?
YES
Check the vicinity of
IC501.
Check IC521 and
IC541.
Proceed to the Tracking
section
Tracking Section
When the disc is rotated
at first:
Is the tracking error signal
output at IC521 "12"?
Check IC521.
Approx. 1.2 V
YES
Check the circuit in the
vicinity of IC521 pins
"2" ~ "12".
YESYES
Check the pickup and
its connections.
1-13
KD-S723R/KD-S721R
Maintenance of laser pickup
(1) Cleaning the pick up lens
Before you replace the pick up, please try to
clean the lens with a alcohol soaked cotton
swab.
(2) Life of the laser diode
When the life of the laser diode has expired,
the following symptoms will appear.
(1) The level of RF output (EFM output:ampli
tude of eye pattern) will be low.
Is RF output
1.0 0.35Vp-p?
YES
O.K
(3) Semi-fixed resistor on the APC PC board
The semi-fixed resistor on the APC printed
circuit board which is attached to the pickup
is used to adjust the laser power.Since this
adjustment should be performed to match the
characteristics of the whole optical block,
do not touch the semi-fixed resistor.
If the laser power is lower than the specified
value,the laser diode is almost worn out, and
the laser pickup should be replaced.
If the semi-fixed resistor is adjusted while
the pickup is functioning normally,the laser
pickup may be damaged due to excessive current.
NO
Replace it.
Replacement of laser pickup
Turn off the power switch and,disconnect the
power cord from the ac outlet.
Replace the pickup with a normal one.(Refer
to "Pickup Removal" on the previous page)
Plug the power cord in,and turn the power on.
At this time,check that the laser emits for
about 3seconds and the objective lens moves
up and down.
Note: Do not observe the laser beam directly.
1-14
Play a disc.
Check the eye-pattern at TP1.
Finish.
Description of major ICs
HA13164A(IC901):Regulator
1.Terminal layout
REMOTE
ANT
ACC.IN
VDD5V
SW5V
ACC5V
ANT.CTRL
MEMORY.IN
MEM.DET9VCTRL
123456789101112131415
2.Block diagram
CD8VAJILL10V
KD-S723R/KD-S721R
GND
3.Pin function
11
12
10
8
2
1
7
Surge Protector
BIAS TSD
15
3
TAB
note1) TAB (header of IC)
13
connected to GND
9
6
4
5
14
UNIT R:
C:F
Pin No. Symbol Function
1
2
REMOTE
ANT
Output voltage is VCC-1 V when M or H level applied to CTRL pin.
Output voltage is VCC-1 V when M or H level to CTRL pin and H level
to ANT-CTRL.
3
4
5
6
7
8
9
10
11
12
13
14
15
ACC.IN
VDD5V
SW5V
ACC5V
ANT.CTRL
MEMORY.IN
MEM.DET
9V
CTRL
CD8V
AJ
ILL10V
GND
Connected to ACC.
Regular 5.7V.
Output voltage is 5V when M or H level applied to CTRL pin.
Output for ACC detector.
L:ANT output OFF , H:ANT output ON
Connected to VCC.
Low battery detect.
Output voltage is 9V when M or H level applied to CTRL pin.
L:BIAS OFF, M:BIAS ON, H:CD ON
Output voltage is 8V when H level applied to CTRL pin.
Adjustment pin for ILM output voltage.
Output voltage is 10V when M or H level applied to CTRL pin.
Connected to GND.
1-15
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