JVC KD-SX975 User manual

SERVICE MANUAL
CD RECEIVER
No.49620
Feb. 2001
COPYRIGHT 2001 VICTOR COMPANY OF JAPAN, LTD.
KD-SX975 / KD-SX875
KD-SX975 / KD-SX875
Area Suffix
U ---- Other Areas
Contents
Safety precaution
Preventing static electricity
Location of main parts
Disassembly method
Adjustment method
1-2
1-3
1-4
1-5
1-10
Flow of functional
operation unit TOC read
Maintenance of laser pickup
Replacement of laser pickup
Discription of major ICs
1-11
1-13
1-13
1-14

KD-SX975 / KD-SX875
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-SX975 / KD-SX875
1-3
Front bracket
CD mechanism
control board
Damper bracket
CD mechanism ass’y
FD screw
Feed motor ass’y
FD gear Pickup unit
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 prevent 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.
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
Conductive material
(conductive sheet) or iron plate
(caption)
Anti-static wrist strap
Soldering
Attention when traverse unit is decomposed
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.
*Please refer to "Disassembly method" in the text for pick-up and how to
detach the substrate.

KD-SX975 / KD-SX875
1-4
Location of main parts
Control unit
Main unit
CD mechanism
Main board 16 pin connector
Power IC
Main board assembly
Loading motor
Damper
Damper
Damper
Spindle motor
Feed motor
Optical
pick up unit
Mechanism relay board
RCA jack
Connector to front PCB
Antenna
jack
Changer control
connector
Front PCB
Display
Tuner
pack

KD-SX975 / KD-SX875
1-5
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 Fig.2 )
1. Remove the three screws B attaching the heat sink on
the left side of the body, and remove the heat sink.
Removing the bottom cover (See Fig.3 )
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.1
Fig.2
Front chassis
b
a
a
b
Heat sink
B
B
B
Fig. 3
Regulator board
ed
c
A
A

KD-SX975 / KD-SX875
1-6
Removing the main amplifier board assembly
(See Fig.4 and 5)
1.
2.
3.
4.
5.
Remove the front chassis.
Remove the bottom cover.
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
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.6 )
1.
2.
3.
4.
Remove the front chassis.
Remove the bottom cover.
Remove the main amplifier board assembly.
Remove the three screws E attaching the CD mechanism
assembly from the top cover.
Removing the control switch board
(See Fig.7 and 8 )
1.
2.
3.
Remove the front chassis.
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
unit.
Fig.4
Fig. 5
D
D
CD mechanism assembly E
EE
Top cover
Fig. 6
C
C
CN501
Main amplifier board
F
F
F
FFig. 7
Fig. 8
Control switch board

KD-SX975 / KD-SX875
1-7
Unsolder the part aand bon 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 Aattaching 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 dand the front bracket slot e.
Disconnect the flexible wire from connector on the
pickup unit.
1.
2.
3.
4.
5.
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:
Prior to performing the following procedure, remove
the CD mechanism control board.
Remove the two springs fattaching the CD
mechanism assembly and the front bracket.
Remove the two screws Band the front bracket
while pulling the flame outward.
Remove the belt and the screw Cfrom the loading
motor.
1.
2.
3.
Removing the loading motor
(See Fig.3 to 5)
<CD mechanism section>
Fig.2
Fig.3
Fig.4
Shift the lock
Flexible wire
Pickup unit
FD gear
CD mechanism control board
Loading motor Front bracket
Front bracket Pull outward
Pull outward
Flame
f
B
f
B
Fig.5
C
Loading motor
Belt
Fig.1
Front bracket CD mechanism
control board
Damper bracket
h
c
d
b
a
DD
D
CD mechanism assembly
Ae
h

KD-SX975 / KD-SX875
1-8
Prior to performing the following procedure, remove
the CD mechanism control board and the front
bracket (loading motor).
Remove the three screws Dand 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 g
as shown in Fig.8 and 9.
Remove the CD mechanism assembly and the two
springs hattaching the flame.
Remove the two screws Eand both sides rear
damper brackets from the dampers. Detach the CD
mechanism assembly from the left side to the right
side.
1.
2.
3.
4.
Removing the CD mechanism assembly
(See Fig.1, 6 to 9)
The CD mechanism assembly can be
removed if only the rear damper
bracket on the left side is removed.
ATTENTION:
Fig.6
Fig.7
Fig.8
Fig.9
Rear damper bracket
Fix arm (R)
Damper
DD
Damper bracket
CD mechanism
assembly
Flame h
h
D
D
Fig.1
Front bracket CD mechanism
control board
Damper bracket
h
c
d
b
a
DD
D
CD mechanism assembly
Ae
Fix plate (L)
g
g
Rear damper bracket Fix arm (L)
Damper
E
Fix plate(R)
E
g
g
h

KD-SX975 / KD-SX875
1-9
Prior to performing the following procedure, remove
the CD mechanism control board, the front bracket
(loading motor) and the CD mechanism assembly.
Remove the two screws Fand the feed motor
assembly.
1.
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), the CD mechanism assembly and
the feed motor assembly.
Detach the FD gear part of the pickup unit upward.
Then remove the pickup unit while pulling out the
part iof the FD screw.
1.
Remove the screw Gattaching 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 pickup unit,
reattach the part jof the pickup unit,
then the part iof the FD screw.
ATTENTION:
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.
Turn up the CD mechanism assembly and remove
the two springs kon both sides of the clamper arms.
Open the clamper arm upward.
Turn the turn table, and remove the two screws H
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
kk
Pickup unit
Part i
FD screw
Feed motor assembly
FD gear Pickup unit
Part j
F
Nut push spring plate
Pickup mount nut
Pickup unit
FD screw
G
H
H

KD-SX975 / KD-SX875
1-10
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
Standard measuring conditions
Power supply voltage DC14.4V(10.5
– 16V)
Load impedance 4 (4 to 8 allowance)
How to connect the extension cable for adjusting
Standard volume position
Balance and Bass & Treble volume : Indication "0"
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.
EXTGS004-26P
1 –3 87.5MHz –108.0MHz
531kHz –1602kHz
Frequency Band
Line-out Level / Impedance:
KD-SX975 : 4.0 V 20 k load (full scale)
KD-SX875 : 2.0 V 20 k load (full scale)
BBE:OFF
EXTGS004-26P

KD-SX975 / KD-SX875
1-11
When the pickup correctly moves
to the inner area of the disc
Microprocessor
commands
FMO
TC9462"53"
FEED MOTOR
+TERMINAL
IC581" 6 "
REST SW
When correctly focused
Focus Servo Loop ON
Power ON
Set Function CD
Disc inserted
Pickup feed to the inner area
YES
Laser emitted
Focus search
YES
Disc rotates
RF signal eye-pattern
remains closed
Tracking loop closed
RF signal eye-pattern
opens
TOC readout
Jump to the first track
Play
When the laser diode correctly
emits
Microprocessor
commands
SEL
TC9462
LD
CN501
"No disc"
display
When the disc correctly rotates
Microprocessor
commands
DMO
TC9462
Spindle
motor(-)
IC581" 5 "
Tracking Servo Loop ON
RF signal
Rough Servo Mode
CLV Servo Mode
(Program Area)
CLV Servo Mode
(Lead-In Area;
Digital: 0)
Flow of functional operation unit TOC read
$83 $82 $81
0V
6V
4V
2V
OFF
ON
5V
Hi-Z
FEO
TA2109
14
2.2V
$84
5V
0V
4V
0V
57
55
$84 $86 $ A200
5V
2.2V
0V
6V
3.2
2V
Rough
Servo
Acceleration Servo CLV
0.5 Sec0.5 Sec
1

KD-SX975 / KD-SX875
1-12
Feed section
Focus section
Spindle section
Tracking section
Is the voltage output at
IC521 pin "53" 5V or 0V? Is the wiring for IC521
(90)~(100) correct? Is 5V present at IC581
pin "20"?
Check CD 9V
and 5V.
Check the vicinity of
IC521.
Check the feed motor
connection wiring.
Is 6V or 2V present at
IC581 " 6 " and " 7 "?
Check IC581.
Is 4V present at both
sides of the feed motor?
Check the feed motor.
YES
YES
NO YES NO
YES
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES YES
YES
YES
YES
YES
YES YES
YES
YES
When the lens is
moving:
4V
Does the S-search
waveform appear at
IC581 pins "8" and "9"?
Check the circuits in
the vicinity of IC501
pins "8","9"and"15".
Check the pickup and
its connections.
Is the disk rotated?
Does the RF signal
appear at TP1?
Is the RF waveform at TP1
distorted?
Proceed to the Tracking
section
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
Is 4V present at IC521
pins "55" ?
Check IC501 and
IC521.
Check the vicinity of
IC581.
When the disc is rotated
at first:
Approx. 1.2V
Is the tracking error signal
output at IC501 "12"?
Check IC521.
Check the circuit in the
vicinity of IC501 pins
"2"~"12".
Check the pickup and
its connections.
NO

KD-SX975 / KD-SX875
1-13
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.
(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.
Is RF output
1.3 0.4Vp-p?
YES
NO
O.K
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.

KD-SX975 / KD-SX875
1-14
UPD178078GF-543 (IC701): SYSTEM CPU
1.Terminal layout
2.Block diagram
1
30
~
80
51
~
100 ~ 81
31 ~ 50
8-bit TIMER/
EVENT COUNTER 1
8-bit TIMER/
EVENT COUNTER 0
WATCHDOG TIMER
BASIC TIMER
SERIAL
INTERFACE 0
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
RESET
CPU
PERIPHERAL
VOSC
VCPU
TXD0/LM1
RXD0/LM0
INTP0/NC
INTP7/NC
VM45/VTR-LOGIC
REGOSC
REGCPU
GND0
GND1
BEEP0/BUZZER
BUZ/NC
RESET
X1
X2
VDDPORT
GNDPORT
VDD
SERIAL
INTERFACE 1
SERIAL
INTERFACE 3
UART0
8INTERRUPT
CONTROL
BUZER OUTPUT
SYSTEM
CONTROL
VOLTAGE
REGULATOR
PLL
VOLTAGE
REGULATOR
PLL
FREQUENCY
COUNTER
A/D
CONVERTER
PORT 13
PORT 12
PORT10
PORT 7
PORT 6
PORT 5
PORT 4
PORT 3
PD178078
:3Kbyte
PD178076
:2Kbyte
RAM
PD178078
:60Kbyte
PD178076
:48Kbyte
ROM
78k/0
CPU
CPRE
16-bit TIMER/
EVENT COUNTER PORT 0
PORT 1
PORT 2
8
8
8
8
8
8
8
8
8
8
3
5
NC,JBUS-INT,SW1,
REMOCON,PS1,PS2,
DETACH,NC
KEY0,KEY1,KEY2,LEVEL,
SM,OPEN.NC,
JBUS-SI,JBUS-SO,
JBUS-SCK,NC,VOL-DA,
VOL-CLK
VTR-LOGIC,VTR-CONT,
POWER,CD-ON,MUTE,
NC.BUZZER.NC
NC
NC,LCD-CE,SW2,SW3,
SW4,RST-SW,ENC1,ENC2
MONO,SEEK/STOP,
FM/AM.DIM IN.ANTENNA.
TEL MUTING.STAGE1.STAGE2
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
AMIFC/NC
FMIFC/IFC
EO1
EO0
VCOL
VCOH
VDDPLL
GNDPLL
IC
GND2
AVDD
AVSS
Description of major ICs

KD-SX975 / KD-SX875
1-15
UPD178078GF(1/2)
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
-
I
I
O
O
-
-
-
O
O
-
O
O
O
-
O
I
I
I
I
I
I
I
I
I
I
-
I
I
-
-
-
-
-
-
I
-
-
I
-
-
I
-
I
-
-
O
O
-
I
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
I/OSymbol FUNCTION
Non connection
JVC BUS COMMUNICATION LINE
JVC BUS COMMUNICATION LINE
JVC BUS COMMUNICATION LINE
JVC BUS COMMUNICATION LINE
Non connection
Non connection
Non connection
VOL IC COMMUNICATION LINE
VOL IC COMMUNICATION LINE
Non connection
CD DRIVER COMMUNICATION LINE
LCD DRIVER COMMUNICATION LINE
JVC BUS OUTPUT SELECT
Non connection
LCD DRIVER COMMUNICATION LINE
CD MECHA SW
CD MECHA SW
CD MECHA SW
TRAVERSE MECHA REST SW
ENCODER INPUT
ENCORDER INPUT
KEY INPUT
KEY INPUT
KEY INPUT
AUDIO LEVEL INPUT
-
SIGNAL LEVEL METER INPUT
DOOR OPEN DATECTION
Non connection
-
-
-
-
SYSTEM CLOCK
SYSTEM CLOCK
-
-
STATION DETECTOR & STERO IND
Non connection
IF COUNT INPUT
-
FM,AM OSC INPUT
Non connection
-
PLL ERROR OUTPUT FOR AM
PLL ERROR OUTPUT FOR FM
SETTING TO WRITE FOR FLASH
SYSTEM RESET
SYSTEM RESET
3.Pin function

KD-SX975 / KD-SX875
1-16
UPD178078GF(2/2)
Pin
NO.
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
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
-
SW1
REMOCON
VTR-LOGIC
VTR-CONT
POWER
CD-ON
MUTE
NC
BUZZER
NC
NC
NC
NC
NC
NC
NC
NC
NC
LM0
LM1
BUCK
CCE
BUS0
BUS1
BUS2
BUS3
RST
PS1
PS2
DETACH
NC
GND1
MONO
SEEK/STOP
FM/AM
DIMIN
ANT
TEL MUTE
STAGE1
STAGE2
NC
NC
NC
NC
NC
NC
NC
DIMMER
VDDPORT
GNDPORT
I/OSymbol 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
-
-

KD-SX975 / KD-SX875
1-17
+-+--+
+-
-
-
+
+
REFR
REFL
FILTER
8
9
10
1112
13
14
1234567
INR
NFR
FIL
NFLCL+ Vcc INL
CL- LGND OUTL OUTR RGND CR- CR+
17
8
3220
14
BA3220FV-X(IC341/IC441) : Line Out Amp
1.Terminal layout
2.Block diagram

KD-SX975 / KD-SX875
1-18
BD3860K (IC301):E.Volume
1.Terminal layout
2.Bockdiagram
3.Pin function
1 11
33 23
34
44
22
12
13
12
7
8
10
11
41
42
43
44
1
2
3
4
6 5 9 40 36 35 343328323130 2919 15 14
39 38 37 25 24 26 23 22 21 20 18 17 16
GND FIL VCC SEL1
0 18 dB
0 18 dB
VIN1 LOUD1 HF1 LF1 DET1 TIN1 TNF1 BNF1
OUTF1
OUTR1
SI
SC
OUTR2
OUTF2
BOUT2BNF2TNF2TIN2BBOUT2MIX2VCA2DET2LF2HF2LOUD2VIN2SEL2
D2
C2
B2
A2
D1
C1
B1
A1
BOUT1VCA1 MIX1 BBOUT1
POWER
SUPPLY INPUT
GAIN
INPUT
GAIN
MAIN
VOLUME
0 -40 dB
LOUDNESS
MAIN
VOLUME
0 -40 dB
LOUDNESS
LOW(f=50Hz) 6dB
PROCESS CONTROL +3 to 12dB
(f=10kHz)
LOW(f=50Hz) 6dB
PROCESS CONTROL +3 to 12dB
(f=10kHz)
TREBLE
-14 +14dB
TREBLE
-14 +14dB
BASS
-14 +14dB
BASS
-14 +14dB
FADER
CH1 FRONT
0 -5 dB
FADER
CH2 FRONT
0 -5 dB
FADER
CH1 REAR
0 -5 dB
FADER
CH2 REAR
0 -5 dB
LOGIC
INPUT
SELECTOR
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
CH2 Input Pin A
CH2 Input Pin B
CH2 Input Pin C
CH2 Input Pin D
1/2 VCC Pin
Ground Pin
Serial Data Receiving Pin
Serial Clock Receiving Pin
Power Supply Pin
CH2 Rear Output Pin
CH2 Front Output Pin
CH1 Rear Output Pin
CH1 Front Output Pin
CH1 Bass Filter Setting Pin
CH1 Bass Filter Setting Pin
CH2 Bass Filter Setting Pin
CH2 Bass Filter Setting Pin
CH2 treble Filter Setting Pin
CH1 treble Filter Setting Pin
CH2 treble Input Pin
CH2 BBE II Signal Output Pin
CH2 Output MIX Amplifier
Inverse Input Pin
A2
B2
C2
D2
FIL
GND
SI
SC
VCC
OUTR2
OUTF2
OUTR1
OUTF1
BOUT1
BNF1
BOUT2
BNF2
TNF2
TNF1
TIN2
BBOUT2
MIX2
Pin
No. Symbol Function 23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
CH2 High Pass VCA Output Pin
CH2 Low Pass Filter Setting Pin
CH2 High Pass Filter Setting Pin
CH2 High Pass Attack/Release Time Setting Pin
Non connect
CH1 High Pass Attack/Release Time Setting Pin
CH1 treble Input Pin
CH1 BBE II Signal Output Pin
CH1 Output MIX Amplifier Inverse Input Pin
CH1 High Pass VCA Output Pin
CH1 Low Pass Filter Setting Pin
CH1 High Pass Filter Setting Pin
CH1 Loudness Filter Setting Pin
CH1 Main Volume Input Pin
VCH2 Loudness Filter setting Pin
CH2 Main Volume Input Pin
CH2 Input Gain Output Pin
CH1 Input Gain output Pin
CH1 Input Pin A
CH1 Input Pin B
CH1 Input Pin C
CH1 Input Pin D
VCA2
LF2
HF2
DET2
NC
DET1
TIN1
BBOUT1
MIX1
VCA1
LF1
HF1
LOUD1
VIN1
LOUD2
VIN2
SEL2
SEL1
A1
B1
C1
D1
Pin
No. Symbol Function

KD-SX975 / KD-SX875
1-19
2
1
11
12
10
15 13
14
5
4
6
3
8
9
7
ILM AJGND
C6
10u
C5
0.1u
C4
0.1u
C3
0.1u
AUDIO OUT
CD OUT
CTRL
ANT CTRL
EXT OUT
ANT OUT
VCC ACC
Surge Protector
BIAS TSD
C1
100u C2 0.1u
+B
ACC
BATT.DET OUT
COMPOUT
VDD OUT
SW5VOUT
ILMOUT
C7
0.1u
C8
0.1u
R1
UNIT R:
C:F
note1) TAB (header of IC)
connected to GND
HA13164(IC961):REGULATOR
1.Terminal layout
2.Block diagram
3.Pin function
Pin No. Symbol Function
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
EXTOUT
ANTOUT
ACCIN
VDDOUT
SW5VOUT
COMPOUT
ANT CTRL
VCC
BATT DET
AUDIO OUT
CTRL
CD OUT
ILM AJ
ILM OUT
GND
Output voltage isVCC-1 V when M or H level applied to CTRL pin.
Output voltage isVCC-1 V when M or H level to CTRL pin and H level
to ANT-CTRL.
Connected to ACC.
Regular 5.7V.
Output voltage is 5V when M or H level applies 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 applies to CTRL pin.
Connected to GND.
123456789101112131415

KD-SX975 / KD-SX875
1-20
Vcc Vcc
Input
See Function Table
1A
2A
3A
4A
1C
2C
3C
4C
1Y
2Y
3Y
4Y
Output
Output
Output
Output
Sample as Load Circuit 1
Sample as Load Circuit 1
Sample as Load Circuit 1
1k
1k
S1
CL
Input Output
C
L
H
H
A
X
L
H
Y
Z
H
L
1
2
3
4
5
6
7
14
13
12
11
10
9
8
HD74HC126FP-X (IC771) : Buffer
1.Terminal layout
2.Block diagram
3.Pin function
1C
1A
1Y
2C
2A
2Y
GND
3Y
3A
3C
4Y
4A
4C
Vcc Note: H : High
L : Low
X : H and L
Z : H.L.X