JVC KDSX-875, KDSX-975 Service manual
KD-SX975 / KD-SX875
SERVICE MANUAL
CD RECEIVER
KD-SX975 / KD-SX875
Contents
Safety precaution
Preventing static electricity
Location of main parts
Disassembly method
Adjustment method
1-2
1-3
1-4
1-5
1-10
COPYRIGHT 2001 VICTOR COMPANY OF JAPAN, LTD.
Flow of functional
operation unit TOC read
Maintenance of laser pickup
Replacement of laser pickup
Discription of major ICs
Area Suffix
U ---- Other Areas
1-11
1-13
1-13
1-14
No.49620
Feb. 2001
KD-SX975 / KD-SX875
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-SX975 / KD-SX875
Preventing static electricity
1.Grounding to prevent damage by 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 prev ent this when performing repairs.
2.About the earth processing for the destruction prevention 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.
2-1 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.
2-2 Ground yourself
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
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.
4.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
CD mechanism ass’y
Damper bracket
Attention when traverse unit is decomposed
*Please refer to "Disassembly method" in the text for pick-up and how to
detach the substrate.
1.Solder is put up before the card wire is removed from connector on
the CD substrate as shown in Figure.
(When the wire is removed without putting up solder, the CD pick-up
assembly might destroy.)
2.Please remove solder after connecting the card wire with
when you install picking up in the substrate.
Front bracket
Feed motor ass’y
FD screw
CD mechanism
control board
Soldering
FD gear
Pickup unit
1-3
KD-SX975 / KD-SX875
Location of main parts
Control unit
Display
Front PCB
Main unit
CD mechanism
Main board
16 pin connector
Power IC
Loading motor
Changer control
connector
Connector to front PCB
Antenna
jack
RCA jack
Main board assemb
Tuner
pack
ly
1-4
Damper
Optical
pick up unit
Mechanism relay board
Damper
Spindle motor
Damper
Feed motor
KD-SX975 / KD-SX875
Disassembly method
Removing the front chassis (See Fig.1)
1. Remove two screws A and 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
1. Remove the three screws B attaching the heat sink on
the left side of the body, and remove the heat sink.
Fig.2 )
A
a
a
Front chassis
Fig.1
B
A
b
b
B
Removing the bottom cover (See
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.
Fig.3 )
B
Heat sink
Fig.2
c
Regulator board
e
Fig. 3
d
1-5
KD-SX975 / KD-SX875
Removing the main amplifier board assembly
(See Fig.4 and 5)
1.
Remove the front chassis.
2.
Remove the bottom cover.
3.
Remove the two screws C attaching the main amplifier
board assembly on the bottom of the body.
Remove the three screws D attaching the main amplifier
4.
board assembly on the back of the body.
Disconnect connector CN501 on the main amplifier board
5.
assembly from the CD mechanism assembly.
Main amplifier board
C
D
CN501
C
Fig.4
D
Fig. 5
Removing the CD mechanism assembly
Fig.6 )
(See
Remove the front chassis.
1.
Remove the bottom cover.
2.
Remove the main amplifier board assembly.
3.
Remove the three screws E attaching the CD mechanism
4.
assembly from the top cover.
Removing the control switch board
Fig.7 and 8 )
(See
1.
Remove the front chassis.
2.
Remove the four screws F attaching the rear cover on the
back of the front panel unit.
Remove the control switch board from the front panel
3.
unit.
CD mechanism assembly
Top cover
E
F
F
Control switch board
Fig. 6
Fig. 7
E
E
F
F
1-6
Fig. 8
KD-SX975 / KD-SX875
<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
Fig.5
Belt
Flame
Fig.4
1-7
KD-SX975 / KD-SX875
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.1
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
1-8
Damper
g
g
Fig.9
KD-SX975 / KD-SX875
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
H
Fig.13
1-9
KD-SX975 / KD-SX875
Adjustment method
Test instruments required 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
Standard measuring conditions
Power supply voltage DC14.4V(10.5
Load impedance 4 (4 to 8 allowance)
Line-out Level / Impedance:
KD-SX975 : 4.0 V 20 k load (full scale)
KD-SX875 : 2.0 V 20 k load (full scale)
Standard volume position
Balance and Bass & Treble volume : Indication "0"
BBE:OFF
Frequency Band
FM
MW
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.
–
16V)
1 – 3 87.5MHz – 108.0MHz
531kHz – 1602kHz
How to connect the extension cable for adjusting
EXTGS004-26P
1-10
Flow of functional operation unit TOC read
Power ON
When the pickup correctly moves
to the inner area of the disc
Set Function CD
KD-SX975 / KD-SX875
When the laser diode correctly
emits
Microprocessor
commands
FMO
TC9462"53"
FEED MOTOR
+TERMINAL
IC581" 6 "
REST SW
When correctly focused
FEO
TA2109
14
Focus Servo Loop ON
$83
$82
$81
5V
Hi-Z
0V
6V
4V
2V
OFF
ON
Pickup feed to the inner area
2.2V
RF signal eye-pattern
remains closed
RF signal eye-pattern
opens
Disc inserted
YES
Laser emitted
Focus search
Disc rotates
Tracking loop closed
TOC readout
YES
Microprocessor
commands
SEL
TC9462
LD
CN501
57
1
"No disc"
display
When the disc correctly rotates
Microprocessor
commands
DMO
TC9462
Spindle
motor(-)
IC581" 5 "
$84 $86 $ A200
55
Acceleration Servo CLV
Rough
Servo
0.5 Sec 0.5 Sec
$84
5V
0V
4V
0V
5V
2.2V
0V
6V
3.2
2V
Jump to the first track
Play
Tracking Servo Loop ON
RF signal
Rough Servo Mode
CLV Servo Mode
(Program Area)
CLV Servo Mode
(Lead-In Area;
Digital: 0)
1-11
KD-SX975 / KD-SX875
Feed section
Is the voltage output at
IC521 pin "53" 5V or 0V?
YES
Is 4V present at both
sides of the feed motor?
YES
NO YES NO
NO
Is the wiring for IC521
(90)~(100) correct?
NO
Is 6V or 2V present at
IC581 " 6 " and " 7 "?
NO
Is 5V present at IC581
pin "20"?
Check the vicinity of
IC521.
YES
Check the feed motor
connection wiring.
YES
Check CD 9V
and 5V.
Check the feed motor.
Focus section
When the lens is
moving:
4V
Does the S-search
waveform appear at
IC581 pins "8" and "9"?
Spindle section
Is the disk rotated?
YES
Does the RF signal
appear at TP1?
YES
Is the RF waveform at TP1
distorted?
YES
Proceed to the Tracking
section
Check IC581.
NO
YES
NO
NO
NO
Check the circuits in
the vicinity of IC501
pins "8","9"and"15".
Check the pickup and
its connections.
Is 4V present at IC581
pins "4" and "5"?
Check the spindle motor
and its wiring
Check the circuits in the
vicinity of IC501 "19"~
"24" or the pickup
YES
YES
NO
Is 4V present at IC521
pins "55" ?
Check the vicinity of
IC581.
NO
YES
Check IC501 and
IC521.
Tracking section
1-12
When the disc is rotated
at first:
Approx. 1.2V
Is the tracking error signal
output at IC501 "12"?
YES
Check IC521.
YES YES
Check the circuit in the
vicinity of IC501 pins
"2"~"12".
Check the pickup and
its connections.
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.
KD-SX975 / KD-SX875
Is RF output
1.3 0.4Vp-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.
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.
Play a disc.
Check the eye-pattern at TP1.
Finish.
1-13
KD-SX975 / KD-SX875
Description of major ICs
UPD178078GF-543 (IC701): SYSTEM CPU
1.Terminal layout
2.Block diagram
TO0/VTR-CONT
TI00/POWER
TI01/CD-ON
TI50/MUTE
TO50/NC
TI51/STAGE
TO51/NC
SI0/SB0/SDA0/NC
SO0/SB1/SDA1/VOL-DA
SCK0/SCL/VOL-CLK
SI1/JBUS-SI
SO1/JBUS-SO
SCK1/JBUS-SCK
STB/NC
BUSY/NC
SI3/NC
SO3/LCD-DA
SCK3/SCL/LCD-CLK
TXD0/LM1
RXD0/LM0
INTP0/NC
INTP7/NC
BEEP0/BUZZER
BUZ/NC
RESET
X1
X2
V
DDPORT
GNDPORT
VDD
VM45/VTR-LOGIC
REGOSC
REGCPU
GND0
GND1
16-bit TIMER/
EVENT COUNTER
8-bit TIMER/
EVENT COUNTER 0
8-bit TIMER/
EVENT COUNTER 1
WATCHDOG TIMER
BASIC TIMER
SERIAL
INTERFACE 0
SERIAL
INTERFACE 1
SERIAL
INTERFACE 3
8
INTERRUPT
CONTROL
BUZER OUTPUT
SYSTEM
CONTROL
VOLT AGE
REGULATOR
1
~
30
UART0
100 ~ 81
31 ~ 50
80
~
51
78k/0
CPU
CPRE
RAM
PD178078
:3Kbyte
PD178076
:2Kbyte
RESET
CPU
PERIPHERAL
V
OSC
VCPU
ROM
PD178078
:60Kbyte
PD178076
:48Kbyte
PORT 0
PORT 1
PORT 2
PORT 3
PORT 4
PORT 5
PORT 6
PORT 7
PORT10
PORT 12
PORT 13
A/D
CONVERTER
FREQUENCY
COUNTER
PLL
PLL
VOLT AGE
REGULATOR
NC,JBUS-INT,SW1,
8
REMOCON,PS1,PS2,
DETACH,NC
KEY0,KEY1,KEY2,LEVEL,
8
SM,OPEN.NC,
JBUS-SI,JBUS-SO,
8
JBUS-SCK,NC,VOL-DA,
VOL-CLK
VTR-LOGIC,VTR-CONT,
8
POWER,CD-ON,MUTE,
NC.BUZZER.NC
8
NC
NC,LCD-CE,SW2,SW3,
8
SW4,RST-SW,ENC1,ENC2
8
TEL MUTING.STAGE1.STAGE2
8
3
5
8
8
MONO,SEEK/STOP,
FM/AM.DIM IN.ANTENNA.
NC,LCD-DA,LCD-CLK,
JBUS-/O,LM0,LM1,BUCK,
CCE
SD/ST,NC,IFC
BUS0,BUS1,BUS2,BUS3,
RST
NC
AN10/KEY0
AN17/NC
DD
AV
AVSS
AMIFC/NC
FMIFC/IFC
EO0
EO1
VCOL
VCOH
DDPLL
V
GNDPLL
1-14
IC
GND2
KD-SX975 / KD-SX875
3.Pin function
Pin
NO.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
NC
JBUS-INT
JBUS-SI
JBUS-SO
JBUS-SCK
NC
NC
NC
VOL-DA
VOL-CLK
NC
LCD-DA
LCD-CLK
JBUS-I/O
NC
LCD-CE
SW2
SW3
SW4
RST-SW
ENC1
ENC2
KEY0
KEY1
KEY2
LEVEL
AVDD
SM
OPEN
NC
NC
AVSS
REGCPU
VDD
REGOSC
X2
X1
GND
SD/ST
GND2
NC
IFC
VDDPLL
OSC-INPUT
NC
GNDPLL
AME0
FME0
ICVPP
RESET
UPD178078GF(1/2)
I/OSymbol
-
Non connection
I
JVC BUS COMMUNICATION LINE
I
JVC BUS COMMUNICATION LINE
O
JVC BUS COMMUNICATION LINE
O
JVC BUS COMMUNICATION LINE
-
Non connection
-
Non connection
-
Non connection
O
VOL IC COMMUNICATION LINE
O
VOL IC COMMUNICATION LINE
-
Non connection
O
CD DRIVER COMMUNICATION LINE
O
LCD DRIVER COMMUNICATION LINE
O
JVC BUS OUTPUT SELECT
-
Non connection
O
LCD DRIVER COMMUNICATION LINE
I
CD MECHA SW
I
CD MECHA SW
I
CD MECHA SW
I
TRAVERSE MECHA REST SW
I
ENCODER INPUT
I
ENCORDER INPUT
I
KEY INPUT
I
KEY INPUT
I
KEY INPUT
I
AUDIO LEVEL INPUT
-
-
I
SIGNAL LEVEL METER INPUT
I
DOOR OPEN DATECTION
-
Non connection
-
-
-
-
-
-
-
-
-
SYSTEM CLOCK
I
SYSTEM CLOCK
-
-
-
-
I
STATION DETECTOR & STERO IND
-
Non connection
-
IF COUNT INPUT
I
-
-
FM,AM OSC INPUT
I
Non connection
-
-
-
PLL ERROR OUTPUT FOR AM
O
PLL ERROR OUTPUT FOR FM
O
SETTING TO WRITE FOR FLASH
-
SYSTEM RESET
I
SYSTEM RESET
FUNCTION
1-15
KD-SX975 / KD-SX875
Pin
NO.
51
SW1
52
REMOCON
53
VTR-LOGIC
54
VTR-CONT
55
POWER
56
CD-ON
57
MUTE
58
NC
59
BUZZER
60
NC
61
NC
62
NC
63
NC
64
NC
65
NC
66
NC
67
NC
68
NC
69
LM0
70
LM1
71
BUCK
72
CCE
73
BUS0
74
BUS1
75
BUS2
76
BUS3
77
RST
78
PS1
79
PS2
80
DETACH
81
NC
82
GND1
83
MONO
84
SEEK/STOP
85
FM/AM
86
DIMIN
87
ANT
88
TEL MUTE
89
STAGE1
90
STAGE2
91
NC
92
NC
93
NC
94
NC
95
NC
96
NC
97
NC
98
DIMMER
99
VDDPORT
100
GNDPORT
I/OSymbol
I
I
-
O
O
O
-
I
-
-
-
-
-
-
-
-
O
O
O
O
I/O
I/O
I/O
I/O
O
I
I
I
-
O
O
O
I
O
I
-
-
-
-
-
-
-
-
O
-
UPD178078GF(2/2)
FUNCTION
CD MECHA SW
REMOCON INPUT
Non connection
Non connection
POWER CONT.
CD POWER CONT.
MUTE CONT
Non connection
BEEP FOR SW OPERATION
Non connection
Non connection
Non connection
Non connection
Non connection
Non connection
Non connection
Non connection
Non connection
CD MECHA DRIVER CONT.
CD MECHA DRIVER CONT.
CD LSI COMMUNICATION LINE
CD LSI COMMUNICATION LINE
CD LSI COMMUNICATION LINE
CD LSI COMMUNICATION LINE
CD LSI COMMUNICATION LINE
CD LSI COMMUNICATION LINE
CD LSI COMMUNICATION LINE
ACC DETECTION INPUT
MEMORY DETECTION
DETACH DETECTION
Non connection
MONO BY FORCE
SWITCHING SEEK & STOP
BAND SW
OUTPUT L
ILM CONTROL
ANT COTROL
TEL MUTE IN
Non connection
Non connection
Non connection
Non connection
Non connection
Non connection
Non connection
Non connection
Non connection
DIMMER CONTROL
-
-
1-16
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