JVC KD-S785 User manual

SERVICE MANUAL
CD RECEIVER
No.49748
Jun. 2002
COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD.
KD-S785
KD-S785
Area Suffix
U Other Areas
45Wx4 KD-S785
789
10 11 12
DISP
LOUD
RPT RND SCM
BA
ND
TU N E R
SOUND
VOL VOL
SOURCE
RF
U
D
ATT
SCAN MO
Contents
Safety precaution
Preventing static electricity
Disassembly method
Adjustment method
1-2
1-3
1-4
1-11
Flow of functional
operation untill TOC read
Maintenance of laser pickup
Replacement of laser pickup
Description of major ICs
1-12
1-14
1-14
1-15~33

KD-S785
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-S785
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-S785
1-4
Press the eject button in the lower right part of the
front panel. Remove the front panel assembly from
the body.
1.
Removing the front panel assembly
(See Fig.1)
Prior to performing the following procedure, remove
the front panel assembly.
Release the four joint tabs aon both sides of the
front chassis assembly and remove the front chassis
assembly toward the front.
1.
Removing the front chassis assembly
(See Fig.2, 3)
Disassembly method
<Main body>
Fig.1
Fig.2
Fig.3
Front panel assembly
Eject button
Tab a
Tab a
Front chassis assembly
Front chassis
assembly
Heat sink Tab a
Tab a

KD-S785
1-5
Remove the three screws Aon the left side of the
body.
1.
Removing the heat sink (See Fig.4)
Prior to performing the following procedure, remove
the front panel assembly, the front chassis assembly
and the heat sink.
Turn the body upside down.
Insert a screwdriver to the two joints band two joints
con both sides of the body and the joint don the
back of the body, then detach the bottom cover from
the body.
1.
2.
Removing the bottom cover
(See Fig.5, 6)
When disengaging the joint dusing a
screwdriver, do not damage or break the
board.
CAUTION:
Fig.4
Fig.5
Fig.6
Heat sink
AA
Joint b
Joint c
Joint d
Joint c
Joint b
Joint d
Bottom cover
Bottom cover
Rear panel
Rear panel

KD-S785
1-6
Prior to performing the following procedure, remove
the front panel assembly, the front chassis assembly,
the heat sink and the bottom cover.
Remove the screw B, the four screws C and the
three screws Dattaching the rear bracket on the
back of the body. Remove the rear panel.
Remove the two screws Eattaching the main board
on the bottom of the body. Disconnect connector
CN501 on the main board in the direction of the
arrow.
1.
2.
Removing the main board (See Fig.7, 8)
Prior to performing the following procedure, remove
the front panel assembly, the front chassis assembly,
the heat sink, the bottom cover and the main board.
Remove the three screws Fattaching the cassette
mechanism section on the back of the top chassis.
1.
Removing the CD mechanism section
(See Fig.9)
Fig.7
Fig.8
Fig.9
Main board
E
E
CN501
CD mechanism section
F
F
Top chassis
F
Rear panel
B
D
D
D
CCC

KD-S785
1-7
Prior to performing the following procedure, remove
the front panel assembly.
Remove the four screws Gattaching the rear cover
on the back of the front panel assembly.
Unjoint the eleven joints ewith the front panel and
the rear cover.
Remove the control switch board on the back of the
front panel.
1.
2.
3.
Removing the control switch board
(See Fig.10 ~ 12)
Fig.10
Fig.11
Fig.12
G
GG
G
Rear cover
Joint e
Front panel
Rear cover
Front panel
Control switch board
Joint e
Joint e
Joint e

KD-S785
1-8
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-S785
1-9
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.5
Front bracket
CD mechanism
control board
Damper bracket
h
c
d
b
a
DD
D
CD mechanism assembly
A
e
Fix plate (L)
g
g
Rear damper bracket
Fix arm (L)
Damper
E
Fix plate(R)
E
g
g
h

KD-S785
1-10
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-S785
1-11
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 4 (2 Speakers connection)
Line oout impeadance 20k
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
AM 531kHz ~ 1602 kHz
EXTGS004-26P

KD-S785
1-12
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 until TOC 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

KD-S785
1-13
Feed Section
Focus Section
Tracking Section
Spindle Section
Is the voltage output at
IC521 pin "53" 5V or 0V?
Check the feed motor.
Is 4V present at both
sides of the feed motor?
Is the wiring for IC521
(90) ~ (100) correct?
Check IC581.
Is 6V or 2V present at
IC581 "5" and "6"?
Is 5V present at IC581
pin "11"?
Check the feed motor
connection wiring.
Check the vicinity of
IC521.
Check CD 9V
and 5V.
YES
YES
YES
NONO
NO
NO
NO
YES
YES
When the lens is
moving:
Check the circuits in
the vicinity of IC581
pins "15" ~ "18".
Check the pickup and
its connections.
NO
YES
YES
YES
Does the S-search
waveform appear at
IC581 pins "17" and "18"?
Is the disk rotated?
Does the RF signal
appear at TP1?
Is 4V present at IC581
pins "7" and "8" ?
Check the spindle motor
and its wiring.
Is 4V present at IC521
pin "55" ?
Check the vicinity of
IC581.
Check IC501 and
IC521.
YES
NO
NO
NO
NO NO
YES
YES
YES
Check the circuits in the
vicinity of IC501 "19" ~
"24" or the pickup
Is the RF waveform at TP1
distorted?
Proceed to the Tracking
section
When the disc is rotated
at first:
Check the circuit in the
vicinity of IC501 pins
"2" ~ "12".
Check IC521.
Check the pickup and
its connections.
YESYES
YES
Is the tracking error signal
output at IC501 "12"?
Approx. 1.2 V
4V

KD-S785
1-14
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.
Replacement of laser pickup
Is RF output
1.0 0.35Vp-p? Replace it.
NO
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.
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.
Play a disc.
Check the eye-pattern at TP1.
Finish.

KD-S785
1-15
Description of major ICs
Micro-
controller
interface
Audio output
circuit Digital output
16k
RAM
Address
circuit
1-bit
DAC Servo control
Clock
generator
LPF
PWM D/A
A/D
ROM
CLV servo
Sync signal
protection
EFM
Sub code
detector
Data
slicer
VCO
PLL
TMAX
Digital equalizer
automatic
adjustment circuit
RAM
Correction
circuit
48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33
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
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
BCK
LRCK
AOUT
DOUT
IPF
V
DD3
V
SS3
SBOK
CLCK
DATA
SFSY
SBSY
/HSO
/
UHSO
PV
DD3
PDO
VXDD3 XO XI XV
SS3
TEIN V
DD3
V
SS3
DMO FMO AV
DD3
SEL TEBC RFGC V
REF
TRO FOO
DV SS3
RO
DV
DD3
DVR
LO
DV
SS3
ZDET
V
SS5
BUS0
BUS1
BUS2
BUS3
BUCK
/CCE
/RST
V
DD5
TEZI
TEI
SBAD
FEI
RFRP
RFZI
RFCT
AV
DD3
RFI
SLCO
AV
SS3
VCOF
RV
REF
LPFO
LPFN
TMAX
TC9490FA (IC541) : DSP & DAC
1.Pin layout & Block daiagram

KD-S785
1-16
2.Pin function (1/2)
I/O
O
O
O
O
O
-
-
O
I/O
O
O
O
O
O
-
O
O
I
O
-
O
-
O
I
-
I
I
I
I
I
I
I
O
O
-
Function
Bit clock outputpin 32fs, 48fs, or 64fs selectable by command.
L/R channel clock output pin."L" for L channe and "H" for R channel.
Output polarity can be inverted by command.
Audio data output pin. MSB-first or LSB-first selectable by command.
Digital data output pin. Outputs up to double-speed playback.
Correction flag output pin.When set to "H",AOUT output cannot be corrected
by C2 correction processing.
Digital 3.3V power supply voltage pin.
Digital GND pin.
Subcode Q data CRCC result output pin."H" level when result is OK.
Subcode P-W data read clockI/O pin. I/O polarity selectable by command.
Subcode P-W data output pin.
Playback frame sync signal output pin.
Subcode block sync signal output pin. "H" level at S1 when subcode sync is
detected.
Playback speed mode flag output pins.
PLL-only 3.3V power supply voltage pin.
EFM and PLCK phase difference signal output pin.
TMAX detection result output pin.
Inverted input pin for PLL LPF amp.
Output oin for PLL LPF amp.
PLL-only V
REF pin.
VCO filter pin.
Analog GND pin.
DAC output pin for data slice level generation.
RF signal input pin.Zin selectable by command.
Analog 3.3V power supply voltage pin.
RFRP signal center level input pin.
RFRP signal zero-cross input pin.
RF ripple signal input pin.
Focus error signal input pin.
Sub-beam adder signal input pin.
Tracking error input pin. Inputs when tracking servo is on.
Tracking error signal zero-cross input pin.
Focus equalizer output pin.
Tracking equalizer output pin.
Analog reference power supply voltage pin.
Symbol
BCK
LRCK
AOUT
DOUT
IPF
VDD3
VSS3
SBOK
CLCK
DATA
SFSY
SBSY
/HSO
/UHSO
PVDD3
PDO
TMAX
LPFN
LPFO
PVREF
VCOF
AV
SS3
SLCO
RFI
AV
RFCT
RFZI
RFRP
FEI
SBAD
TEI
TEZI
FOO
TRO
V
REF
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
TC9490FA(2/3)
Playback speed/UHSO /HSO
H
H
L
--
H
L
L
--
Normal
Double
4 times
---
TMAX Output
TMAX Detection result
Longer than fixed period
Within fixed period
Shorter than fixed period
"PV
DD3 "
"HIZ"
"AV
SS3"

KD-S785
1-17
2.Pin function (2/2)
I/O
O
O
O
-
O
O
-
-
I
-
I
O
-
-
O
-
-
O
-
O
-
I/O
I
I
I
-
Function
RF amplitude adjustment control signal output pin.
Tracking balance control signal output pin.
APC circuit ON/OFF signal output pin. At laser on,high impedance with
UHS="L" ,H output with UHS="H".
Analog 3.3V power supply voltage pin.
Feed equalizer output pin.
Disc equalizer output pin.
Digital GND pin.
Digital 3.3V power supply voltage pin.
Test input pin. Normally,fixed to "L".
System clock oscillator GND pin.
System clock oscilatoe input pin.
System clock oscillator output pin.
System clock oscillator 3.3V power supply voltage pin.
DA converter GND pin.
R-channel data forward output pin.
DA converter 3.3V power supply pin.
Reference voltage pin.
L-channel data forward output pin.
DA converter GND pin.
1 bit DA converter zero data detection flag output pin.
Microcontroller interface GND pin.
Microcontroller interface data I/O pins.
Microcontroller interface clock input pin.
Microcontroller interface chip enable signal input pin.At "L".
Bus0 to BUS3 are active.
Reset signal input pin. At reset,"L".
Microcontroller interface 5V power supply pin.
Symbol
RFGC
TEBC
SEL
AVDD3
FMO
DMO
VSS3
VDD3
TESIN
XVSS3
XI
XO
XVDD3
DVSS3
RO
DVDD3
DVR
LO
DVSS3
ZDET
VSS5
BUS0
BUS1
BUS2
BUS3
BUCK
/CCE
/RST
VDD5
Pin No.
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
TC9490FA(3/3)
IN
Vout
GND
1
3
2
OP1
Co1
IC-PST600M/G/-W (IC702) : System reset

KD-S785
1-18
UPD784215AGC172 (IC701) : Main micon
1.Pin layout
2.Pin functions(1/2)
1
~
25
75
~
51
100 ~ 76
26 ~ 50
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19~21
22
23
24
25
26
27
28
29
30
31
32
33
34,35
36
37
38
39
40
41
42
43
44
45~52
I/O
I
I
I
I
O
O
-
O
-
-
-
-
-
-
I
I
I
I
-
I
-
-
I
I
I
I
I
I
-
I
-
-
-
I
O
I/O
O
O
O
O
O
-
Function
CD mecha sw2
CD mecha sw3
CD mecha sw4
Rest sw
Loading/Eject motor control (Loading side)
Loading/Eject motor control (Eject side)
No use
Antenna remote control
Maicon power supply
GND
Reset detection
CD mecha sw1
J-BUS int
Power save 2, H means STOP mode
No use
Remocon input
A/D converter power supply
A/D reference voltage
Volume encoder pulse input 1
Volume encoder pulse input 2
Key input 0
Key input 1
Key input 2
Level meter input
No use
S.METER input
GND
No use
J-BUS data input
J-BUS data output
J-BUS clock input/output
J-BUS I/O selection output H:output L:input
Data output for LCD driver
CLK output for LCD driver
CE for LCD driver
Buzzer output
No use
Symbol
SW2
SW3
SW4
REST
LM0
LM1
-
ANT CONT
VDD
X2
X1
VSS
XT2
XT1
RESET
SW1
BUS-INT
PS2
-
REMOCON
AVDD
AVREF0
VOL1
VOL2
KEY0
KEY1
KEY2
LEVEL
-
SM
AVSS
-
AVREF
BUS-SI
BUS-SO
BUS-SCK
BUS-I/O
LCD-DA
LCD-SCK
LCD-CE
BUZZER
-

KD-S785
1-19
2.Pin functions(2/2)
Pin No.
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
78~80
81
82
83
84
85
86~89
90
91
92
93
94
95
96
97
98
99
100
I/O
I
O
O
O
I
O
O
O
I
I
O
-
O
O
O
O
I
I
-
-
I
I
O
O
O
-
-
-
O
O
O
-
I
O
O
O
-
I/O
I/O
I/O
I/O
-
-
Function
Station detector or stereo signal input
Loal or distance selecting output
Monoral selection output
CLK output for MP3 decoder
Data input for MP3 decoder / inverting input due to converter
Data output for MP3 decoder / H level during input mode
Standby output for MP3 decoder
Reset output for MP3 decoder
REQ input for MP3 decoder / inverting input due to converter
Detach detect input H: detaching
Auto seek and stop selecting output
No use
FM,AM band selecting output
CE output for PLL IC
Data output for PLL IC
Clock output for PLL IC
Data input from PLL IC
Telephone muting detection input, active level can selected H or L is PSM
No use
GND
Dimmer detecter input L=dimmer on
POWER SAVE 1 L=ACC off
Power ON/OFF control output H=power on
CD power supply control output H=CD power ON
Muting output L=Muting ON
No use
Micon power supply
No use
Data output for E-vol IC
Clock output for E-vol IC
Dimmer control output L=dimmer on
No use
L=U version, H=Japanversion
Clock output for CD LSI
CE output for CD LSI
Reset output for CD LSI
For rewriting flash memory
Data output and input 0 for CD LSI
Data output and input 1 for CD LSI
Data output and input 2 for CD LSI
Data output and input 3 for CD LSI
No use
RF gain control L=CD-RW, H=CD-DA
Symbol
SD/ST
LOCAL
MONO
MP3 CLK
MP3 DATA IN
MP3 DATA OUT
MP3 STANDBY
MP3 RESET
MP3 REQ
DETACH
SEEK/STOP
-
FM/AM
PLL-CE
PLL-DO
PLL-CLK
PLL-DI
TEL-MUTE
-
VSS
VSDIM-IN
PS1
POWER
CD-ON
MUTING
-
VDD
-
VOL-DA
VOL-CLK
DIM-OUT
-
STAGE
BUCK
CCE
RST
TEST
BUS0
BUS1
BUS2
BUS3
-
CD-RW

KD-S785
1-20
11
6 20
1
4
10
15
25
13
14
16
12
9
8
5
7
2
22
17
19
18
21
23
24
3
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
IN 1
IN 2
ST BY
Vcc 1/2 Vcc 3/4
OUT 1+
OUT 1-
PWR GND1
OUT 2+
OUT 2-
PWR GND2
R.F
IN 3
IN 4
PRE GND
ON TIME C Muting &
ON Time Control
Circuit
Protective
circuit
Protective
circuit
Mute
circuit
Ripple
Filter
Stand by
Switch
N.C
+
+
0.22 F
2200 F 0.022 F
0.22 F
TA B
+5V
ST ON
+
+
+
+
47 F
0.22 F
0.22 F
22 F
+
Mute 10K
+
3.3 F
OUT 3+
OUT 3-
Low Level
Mute ON
PWR GND3
OUT 4+
OUT 4-
PWR GND4
LA4743K (IC301) : Power amp.
1.Block diagram