JVC KD-S620 User manual
SERVICE MANUAL
CD RECEIVER
No.49581
Dec. 2000
COPYRIGHT 2000 VICTOR COMPANY OF JAPAN, LTD.
KD-S570 / KD-S620
KD-S570 / KD-S620
Area Suffix
J ---- Northern America
Contents
Safety precaution
Location of main parts
Disassembly method
Adjustment method
Flow of functional operation until TOC read
Maintenance of laser pickup
Description of major ICs
1-2
1-3
1-4
1-9
1-10
1-12
1-13
This service manual is printed on 100% recycled paper.
COMPACT
DIGITAL AUDIO
KD-S620KD-S620
KD-S620
KD-S570KD-S570
KD-S570
31
Model
KD-S620
KD-S570
Remote
control unit
KD-S570/KD-S620
1-2
!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.
Safety precaution
!Please use enough caution not to see the beam directly or touch it in case of an
adjustment or operation check.
KD-S570/KD-S620
1-3
Main unit
Location of main parts
Control unit
CD mechanism
Display LED & key control board
Main board
Tuner
pack
Main board Connector to controller
Power IC
ISO connector Antenna jack
Loading motor
Mechanism relay board
Damper
Optical pick up unit
Damper
Feed motor
Spindle motor
KD-S570/KD-S620
1-4
Disassembly method
Removing the front panel unit(See Fig.1)
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.
1. Press the release switch and remove the front
panel unit in the direction of the arrow.
Removing the front chassis (See Fig.2)
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.
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.
b
a
a
b
A
A
A
Heat sink
c
d
e
Fig.2
Fig.1
Fig. 3
Fig. 4
Regulator board
Front chassis
KD-S570/KD-S620
1-5
Removing the main amplifier board
(See Fig.5 and 6)
1.
2.
3.
4.
5.
Remove the front chassis.
Remove the bottom cover.
Remove the two screws B attaching the main
amplifier board assembly on the bottom of the body.
Remove the three screws C attaching the main
amplifier board assembly on the back of the body.
Disconnect connector CN501 on the main amplifier
board assembly from the CD mechanism assembly.
Removing the CD mechanism assembly
(See Fig.7)
1.
2.
3.
4.
Remove the front chassis.
Remove the bottom cover.
Remove the main amplifier board assembly.
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.
2.
3.
Remove the front chassis.
Remove the four screws E attaching the rear cover
on the back of the front panel unit.
Remove the control switch board from the front
panel unit.
C
Fig.5
Fig. 6
B
B
C
C
CD mechanism assembly
D
DD
Top cover
Fig. 7
EE
EE
Fig. 8
Fig. 9
Control switch board
CN501
Main amplifier board
KD-S570/KD-S620
1-6
Unsolder the part f and g on the CD mechanism
control board.
Remove the stator fixing the CD mechanism control
board and the damper bracket (To remove the stator
smoothly, pick up the center part).
Remove the screw F attaching the CD mechanism
control board.
Remove the CD mechanism control board in the
direction of the arrow while releasing it from the two
damper bracket slots i and the front bracket slot j.
Disconnect the flexible wire from connector on the
pickup unit.
Removing the CD mechanism control
board(See Fig.1 and 2)
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).
ATTENTION:
Fig.1
Fig.2
Fig.3
Fig.4
Front bracket
CD mechanism
control board
Shift the lock
Flexible wire
Pickup unit
FD gear
CD mechanism control board
Loading motor Front bracket
Front bracket Pull outward
Pull outward
Flame
Damper bracket
mm
h
i
g
f
II
I
CD mechanism ass’y
Fj
k
G
k
G
KD-S570/KD-S620
1-7
Prior to performing the following procedure, remove
the CD mechanism control board.
Remove the two springs k attaching the CD mechanism
ass’y and the front bracket.
Remove the two screws G and the front bracket
while pulling the flame outward.
Remove the belt and the screw H from the loading
motor.
Removing the loading motor
(See Fig.3 to 5)
Prior to performing the following procedure, remove
the CD mechanism control PWB and the front
bracket (loading motor).
Remove the three screws I and the damper bracket.
Raise the both sides fix arms and move the fix plates
in the direction of the arrow to place the four shafts l
as shown in Fig.8 and 9.
Remove the CD mechanism ass’y and the two
springs m attaching the flame.
Remove the two screws J and both sides rear
damper brackets from the dampers. Detach the CD
mechanism ass’y from the left side to the right side.
1.
2.
3.
4.
Removing the CD mechanism ass’y
(See Fig.1, 6 to 9)
The CD mechanism ass’y can be
removed if only the rear damper
bracket on the left side is removed.
ATTENTION:
Fig.5
Fig.6
Fig.7
Fig.8
Fig.9
Rear damper bracket
Fix arm (R)
Damper
H
II
Loading motor
Belt
Damper bracket
CD mechanism ass’y
Flame m
m
I
I
Fix plate (L)
ll
Rear damper bracket
Fix arm (L)
Damper
J
Fix plate(R)
J
l
l
KD-S570/KD-S620
1-8
Prior to performing the following procedure, remove
the CD mechanism control board, the front bracket
(loading motor) and the CD mechanism ass’y.
Remove the two screws K and the feed motor ass’y.
1.
Removing the feed motor ass’y
(See Fig.10)
*Prior to performing the following procedure, remove
the CD mechanism control board, the front bracket
(loading motor), the CD mechanism ass’y and the
feed motor ass’y.
Detach the FD gear part of the pickup unit upward.
Then remove the pickup unit while pulling out the
part n of the FD screw.
1.
Remove the screw L attaching the nut push spring
plate and the pickup mount nut from the pickup unit.
Pull out the FD screw.
2.
Removing the pickup unit
(See Fig.10 and 11)
When reattaching the pickuap unit,
reattach the part o of the pickup unit,
then the part n of the FD screw.
ATTENTION:
Prior to performing the following procedure, remove
the CD mechanism control board, the front bracket
(loading motor), the CD mechanism ass’y and the
feed motor ass’y.
Turn up the CD mechanism ass’y and remove the
two springs p on both sides of the clamper arms.
Open the clamper arm upward.
Turn the turn table, and remove the two screws M
and the spindle motor.
1.
2.
Removing the spindle motor
(See Fig.12 and 13)
Fig.10
Fig.11
Fig.12
Fig.13
Spindle motor
pp
Pickup unit
Part n
FD screw
Feed motor ass’y
FD gear Pickup unit
Part O
K
Nut push spring plate Pickup mount nut
Pickup unit
FD screw
L
M
M
KD-S570/KD-S620
1-9
Adjustment method
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 20Kohm(2 Speakers connection)
Output Level Line out 2.0V (Vol. MAX)
How to connect the extension cable for adjusting
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.
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
EXTGS004-26P
The cardboard is cut in a suitable size.
uses for the insulation stand of mechanism.
KD-S570/KD-S620
1-10
Power ON
Set Function to CD
Play
Jump to the first track
TOC readout
Tracking loop closed
Disc rotates
Disc inserted
YES
YES
Laser emitted
Pickup feed to the inner area
Focus search
RF signal eye-pattern
opens
RF signal eye-pattern
remains closed
"No disc"
display
•When correctly focused
Focus Servo Loop ON
•When the laser diode correctly
emits
Microprocessor
commands
Rough Servo Mode
CLV Servo Mode
(ProgramArea)
CLV Servo Mode
(Lead-In Area;
Digital: 0)
•RF signal
Flow of functional operation untilTOC read
•When the pickup correctly moves
to the inner area of the disc
TERMINAL
Microprocessor
commands
FMO
TC9462 "53"
FEED MOTOR
+TERMINAL
IC581 "5"
REST SW
•When the disc correctly rotates
Tracking Servo Loop ON
Servo CLV
Rough
Servo
AccelerationAcceleration
Microprocessor
commands
Spindle
motor (-)
IC581 "7"
0.5 Sec 0.5 Sec
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