Jvc KD-S785 Schematic

SERVICE MANUAL

CD RECEIVER

KD-S785

SOUND

ATT

D

N

A

U

SOURCE

F

R

D

VOL

VOL

LOUD

DISP

7

45Wx4

89

KD-S785

10

12

11

SCAN

RPT RND SCM

B

TUNER

MO

KD-S785

Contents

Safety precaution
Preventing static electricity
Disassembly method
Adjustment method

1-2
1-3
1-4
1-11

Area Suffix

U Other Areas

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

COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD.

No.49748

Jun. 2002

KD-S785

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-S785

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.

(caption)
Anti-static wrist strap

Conductive material

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.

(conductive sheet) or iron plate

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-S785

Disassembly method

<Main body>

Removing the front panel assembly

(See Fig.1)

1.

Press the eject button in the lower right part of the
front panel. Remove the front panel assembly from
the body.

Front panel assembly

Eject button

Fig.1

Removing the front chassis assembly

(See Fig.2, 3)

Prior to performing the following procedure, remove
the front panel assembly.

1.

Release the four joint tabs a on both sides of the
front chassis assembly and remove the front chassis
assembly toward the front.

Tab a

Tab a

Front chassis assembly

Heat sink

Fig.2

Tab a

1-4

Fig.3

Tab a

Front chassis
assembly

Removing the heat sink (See Fig.4)

1.

Remove the three screws A on the left side of the
body.

KD-S785

Removing the bottom cover

(See Fig.5, 6)

Prior to performing the following procedure, remove
the front panel assembly, the front chassis assembly
and the heat sink.

1.

Turn the body upside down.

2.

Insert a screwdriver to the two joints b and two joints
c on both sides of the body and the joint d on the
back of the body, then detach the bottom cover from
the body.

CAUTION:

When disengaging the joint d using a
screwdriver, do not damage or break the
board.

A

Joint d

Joint b

Heat sink

Fig.4

Rear panel

Fig.5

A

Bottom cover

Joint c

Bottom cover

Joint b

Joint c

Joint d

Rear panel

Fig.6

1-5

KD-S785

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 and the bottom cover.

1.

Remove the screw B, the four screws C and the
three screws D attaching the rear bracket on the
back of the body. Remove the rear panel.

2.

Remove the two screws E attaching the main board
on the bottom of the body. Disconnect connector
CN501 on the main board in the direction of the
arrow.

D

E

Rear panel

D

Fig.7

Main board

B

CCC

D

E

Removing the CD mechanism section

(See Fig.9)

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.

1.

Remove the three screws F attaching the cassette
mechanism section on the back of the top chassis.

CN501

F

Fig.8

CD mechanism section

F

Fig.9

F

Top chassis

1-6

KD-S785

Removing the control switch board

(See Fig.10 ~ 12)

Prior to performing the following procedure, remove
the front panel assembly.

1.

Remove the four screws G attaching the rear cover
on the back of the front panel assembly.

2.

Unjoint the eleven joints e with the front panel and
the rear cover.

3.

Remove the control switch board on the back of the
front panel.

Joint e

Front panel

G

G

Rear cover

Fig.10

Joint e

G

G

Joint e

Front panel

Rear cover

Joint e

Fig.11

Control switch board

Fig.12

1-7

KD-S785

<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-S785

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

g

Fix arm (R)

Fix plate (L)

E

D

Fig.7

Rear damper bracket

E

g

Fig.8

Rear damper bracket

Fix plate(R)

Fix arm (L)

Damper

Damper

g

g

Fig.9

1-9

KD-S785

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.

FD screw

k

Spindle motor

Fig.11

k

Fig.12

H

1-10

H

Fig.13

Adjustment method

KD-S785

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

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

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-S785

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

IC581 "5"

REST SW

• When correctly focused

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

"No disc"

display

• When the disc correctly rotates

Microprocessor
commands

Spindle
motor (-)
IC581 "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

IC521 pin "53" 5V or 0V?

YES

Is 4V present at both

sides of the feed motor?

YES

NO

Is the wiring for IC521

(90) ~ (100) correct?

NO

Is 6V or 2V present at

IC581 "5" and "6"?

NO

YES

YES

Is 5V present at IC581

pin "11"?

YES

Check the vicinity of

IC521.

Check the feed motor

connection wiring.

NONO

KD-S785

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 "17" and "18"?

Spindle Section

Is the disk rotated?

YES

Does the RF signal

appear at TP1?

YES

Check IC581.

NO

YES

NO

NO

Check the circuits in
the vicinity of IC581

pins "15" ~ "18".

Check the pickup and

its connections.

Is 4V present at IC581

pins "7" and "8" ?

Check the spindle motor

and its wiring.

YES

YES

NO NO

Is 4V present at IC521

pin "55" ?

YES

Check the vicinity of

IC581.

Check IC501 and

IC521.

Is the RF waveform at TP1

distorted?

YES

Proceed to the Tracking

section

Tracking Section

When the disc is rotated

at first:

Is the tracking error signal

output at IC501 "12"?

Check IC521.

NO

Approx. 1.2 V

YES

Check the circuits in the

vicinity of IC501 "19" ~

"24" or the pickup

Check the circuit in the

vicinity of IC501 pins

"2" ~ "12".

YESYES

Check the pickup and

its connections.

1-13

KD-S785

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

/

TC9490FA (IC541) : DSP & DAC

1.Pin layout & Block daiagram

KD-S785

DV

SS3

RO

DD3

DV

DVR

LO

DV

SS3

ZDET

V

SS5

BUS0

BUS1

BUS2

BUS3

BUCK

/CCE

/RST

VXDD3XOXI

SS3

XV

TEIN

DD3VSS3

V

DMO

FMO

DD3

AV

SEL

TEBC

RFGC

48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33

49

50

51

52

LPF

Clock

generator

1-bit

DAC

PWM

Servo control

A/D

53

54

55

56

Address

circuit

ROM

RAM

Digital equalizer

automatic

adjustment circuit

57

58

59

60

61

62

Micro-

controller

interface

circuit

Correction

Audio output

circuit

16k

RAM

Digital output

CLV servo

Sync signal

protection

EFM

Sub code

detector

63

VCO

PLL

TMAX

REF

V

D/A

Data

slicer

TRO

FOO

32

31

30

29

28

27

26

25

24

23

22

21

20

19

18

TEZI

TEI

SBAD

FEI

RFRP

RFZI

RFCT

AV

DD3

RFI

SLCO

SS3

AV

VCOF

REF

RV

LPFO

LPFN

64

DD5

V

17

TMAX

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

BCK

LRCK

AOUT

DOUT

IPF

DD3

V

V

SBOK

CLCK

DATA

SFSY

SBSY

/HSO

UHSO

DD3

PV

PDO

SS3

1-15

KD-S785

2.Pin function (1/2)

Pin No.

1
2

3
4

Symbol

BCK

LRCK

AOUT
DOUT

5

6
7
8

9
10
11
12

13

14

VDD3

VSS3
SBOK
CLCK

DATA
SFSY
SBSY

/HSO

/UHSO

IPF

I/O

O
O

O
O
O

-

-

O

I/O

O
O
O

O

O

TC9490FA(2/3)

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.

/HSO

H
H

L

--

H

L
L

--

Playback speed/UHSO

Normal
Double
4 times

---

15
16
17

18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35

PVDD3

PDO

TMAX

LPFN
LPFO

PVREF

VCOF
AV

SS3

SLCO

RFI

AV

RFCT

RFZI

RFRP

FEI

SBAD

TEI
TEZI
FOO
TRO

REF

V

-

PLL-only 3.3V power supply voltage pin.

O

EFM and PLCK phase difference signal output pin.

O

TMAX detection result output pin.

TMAX Detection result

Longer than fixed period

Within fixed period

Shorter than fixed period

I

Inverted input pin for PLL LPF amp.

O

Output oin for PLL LPF amp.

REF

-

PLL-only V
VCO filter pin.

O

Analog GND pin.

­DAC output pin for data slice level generation.

O

RF signal input pin.Zin selectable by command.

I

Analog 3.3V power supply voltage pin.

­RFRP signal center level input pin.

I

RFRP signal zero-cross input pin.

I

RF ripple signal input pin.

I

Focus error signal input pin.

I

Sub-beam adder signal input pin.

I

Tracking error input pin. Inputs when tracking servo is on.

I

Tracking error signal zero-cross input pin.

I

Focus equalizer output pin.

O

Tracking equalizer output pin.

O

Analog reference power supply voltage pin.

-

pin.

TMAX Output

"PV

"HIZ"

"AV

DD3

SS3"

"

1-16

KD-S785

2.Pin function (2/2)

Pin No.

36
37
38

39
40
41
42
43
44
45

Symbol

RFGC

TEBC

SEL

AV

FMO
DMO
V
V

TESIN

XV
46
47
48
49

XV

DV
50
51
52

DV

DVR
53
54
55
56
57
58
59
60
61
62

63
64

DV

ZDET

V
BUS0
BUS1
BUS2
BUS3

BUCK

/CCE

/RST

V

DD3

SS3

DD3

XI

XO

DD3

RO

DD3

LO

SS5

DD5

SS3

SS3

SS3

I/O

Function

O

RF amplitude adjustment control signal output pin.

O

Tracking balance control signal output pin.

O

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.

O

Feed equalizer output pin.

O

Disc equalizer output pin.

-

Digital GND pin.

-

Digital 3.3V power supply voltage pin.

I

Test input pin. Normally,fixed to "L".

-

System clock oscillator GND pin.

I

System clock oscilatoe input pin.

O

System clock oscillator output pin.

-

System clock oscillator 3.3V power supply voltage pin.

-

DA converter GND pin.

O

R-channel data forward output pin.

-

DA converter 3.3V power supply pin.

-

Reference voltage pin.

O

L-channel data forward output pin.

-

DA converter GND pin.

O

1 bit DA converter zero data detection flag output pin.

-

Microcontroller interface GND pin.

I/O

Microcontroller interface data I/O pins.

I

Microcontroller interface clock input pin.

I

Microcontroller interface chip enable signal input pin.At "L".
Bus0 to BUS3 are active.

I

Reset signal input pin. At reset,"L".

-

Microcontroller interface 5V power supply pin.

TC9490FA(3/3)

IC-PST600M/G/-W (IC702) : System reset

Co1

OP1

1

3

2

IN

Vout

GND

1-17

KD-S785

UPD784215AGC172 (IC701) : Main micon

1.Pin layout

100 ~ 76

1

75

~

25

26 ~ 50

2.Pin functions(1/2)

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

Symbol

SW2
SW3
SW4

REST

LM0
LM1

ANT CONT

VDD

VSS

XT2
XT1

RESET

SW1

BUS-INT

PS2

REMOCON

AVDD

AVREF0

VOL1

VOL2
KEY0
KEY1
KEY2

LEVEL

SM

AVSS

AVRE F
BUS-SI

BUS-SO

BUS-SCK

BUS-I/O

LCD-DA

LCD-SCK

LCD-CE

BUZZER

X2
X1

~

51

I/O

Function

I

CD mecha sw2

I

CD mecha sw3

I

CD mecha sw4

I

Rest sw

O

Loading/Eject motor control (Loading side)

O

Loading/Eject motor control (Eject side)

-

-

-

-

-

-

No use

O

Antenna remote control

-

Maicon power supply

-

-

-

GND

-

­I

Reset detection

I

CD mecha sw1

I

J-BUS int

I

Power save 2, H means STOP mode

-

No use

I

Remocon input

-

A/D converter power supply

-

A/D reference voltage

I

Volume encoder pulse input 1

I

Volume encoder pulse input 2

I

Key input 0

I

Key input 1

I

Key input 2

I

Level meter input

-

No use

I

S.METER input

-

GND

-

No use

­I

J-BUS data input

O

J-BUS data output

I/O

J-BUS clock input/output

O

J-BUS I/O selection output H:output L:input

O

Data output for LCD driver

O

CLK output for LCD driver

O

CE for LCD driver

O

Buzzer output

-

No use

1-18

2.Pin functions(2/2)

KD-S785

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

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

I/O

Function

I

Station detector or stereo signal input

O

Loal or distance selecting output

O

Monoral selection output

O

CLK output for MP3 decoder

I

Data input for MP3 decoder / inverting input due to converter

O

Data output for MP3 decoder / H level during input mode

O

Standby output for MP3 decoder

O

Reset output for MP3 decoder

I

REQ input for MP3 decoder / inverting input due to converter

I

Detach detect input H: detaching

O

Auto seek and stop selecting output

-

No use

O

FM,AM band selecting output

O

CE output for PLL IC

O

Data output for PLL IC

O

Clock output for PLL IC

I

Data input from PLL IC

I

Telephone muting detection input, active level can selected H or L is PSM

-

No use

-

GND

I

Dimmer detecter input L=dimmer on

I

POWER SAVE 1 L=ACC off

O

Power ON/OFF control output H=power on

O

CD power supply control output H=CD power ON

O

Muting output L=Muting ON

-

No use

-

Micon power supply

-

No use

O

Data output for E-vol IC

O

Clock output for E-vol IC

O

Dimmer control output L=dimmer on

-

No use

I

L=U version, H=Japanversion

O

Clock output for CD LSI

O

CE output for CD LSI

O

Reset output for CD LSI

-

For rewriting flash memory

I/O

Data output and input 0 for CD LSI

I/O

Data output and input 1 for CD LSI

I/O

Data output and input 2 for CD LSI

I/O

Data output and input 3 for CD LSI

-

No use

-

RF gain control L=CD-RW, H=CD-DA

1-19

KD-S785

LA4743K (IC301) : Power amp.

1.Block diagram

IN 1

0.22 F

TA B

IN 2

0.22 F

+

Vcc 1/2 Vcc 3/4

2200 F 0.022 F

6 20

+

11

-

+

+

-

9

7

OUT 1+

OUT 1-

1

Protective

circuit

+

-

+

12

+

-

PWR GND1

8

OUT 2+

5

OUT 2-

3

PWR GND2

2

ST BY

R.F

47 F

IN 3

PRE GND

IN 4

+5V
ST ON

+

0.22 F

N.C

+

0.22 F

4

Stand by

Switch

Mute

10

+

Ripple

Filter

Mute

22

circuit

3.3 F

+

15

-

+

-

17

19

10K

+

OUT 3+

OUT 3-

Low Level
Mute ON

25

18

21

23

PWR GND3

OUT 4+

OUT 4-

13

14

Protective

circuit

-

+

+

-

1-20

ON TIME C

22 F

Muting &

16

+

ON Time Control

Circuit

PWR GND4

24

2.Terminal layout

3.Pin function

KD-S785

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

SymbolPin No.

TA B
GND
RFO­STBY
RFO+
VCC1/2
RRO­GND
RRO+
VREF
RRIN
RFIN
SGND
LFIN
LRIN
ONTIME
LRO+
GND
LRO­VCC3/4
LFO+
MUTE
LFO­GND
NC

Function

Header of IC
Power GND
Outpur(-) for front Rch
Stand by input
Output (+) for front Rch
Power input
Output (-) for rear Rch
Power GND
Output (+) for rear Rch
Ripple filter
Rear Rch input
Front Rch input
Signal GND
Front Lch input
Rear Lch input
Power on time control
Output (+) for rear Lch
Power GND
Output (-) for rear Lch
Power input
Output (+) for front
Muting control input
Output (-) for front
Power GND
No connection

1-21

KD-S785

TA2147F-X (IC521) : RF amp.

1.Terminal layout

2.Block diagram

VRO

FEO

FEN

RFRP

RFRPIN

RFGO

RFGC

AGCIN

RFO

RFN

13GVSW

14

15

16

17

18

19

20

21

22

23

10pF

40k

30k

20k 20k

20k

20k

BOTTOM

3k

15k

50 A

12k

12k

PEAK

20k

180k

40pF

20k

20k

PEAK

1.3V

180k

40k

240k
15pF

240k

15pF

60k

40k

40pF

60k

50k

2k

20 A

20k

60 A

50k

14k

k

1

80k

x0.5

x0.5

80k

20k

20k

15k

x2

x2

1k

2k

1.75k

10pF

12 RFDC

11

TEO

10

TEN

TEBC

9

8

SEL

7

LDO

MDI

6

5

TNI

4

TPI

3

FPI

2

FNI

1-22

GND

24

3k

1

Vcc

3.Pin function

KD-S785

Pin No.

1
2
3
4
5
6
7
8

9

10
11

12
13

Symbol

Vcc
FNI

FPI
TPI

TNI

MDI

LDO

SEL

TEBC

TEN
TEO

RFDC

GVSW

I/O

Function

-

3.3V Power supply pin

I

Main-beam amp input pin

I

Main-beam amp input pin

I

Sub-beam amp input pin

I

Sub-beam input pin

I

Monitor photo diode amp input pin

O

Laser diode amp output pin

I

APC circuit ON/OFF control signal,laser diode (LDO) control signal input or
bottom/peak detection frequency change pin.

APC

circuit

GND OFF

HIZ

Vcc

I

Tracking error balance adjustment signal pin
Adjusts TE signal balance by eliminating carrier component from
PWM signal(3-state output, PWM carrier = 88.2kHz) output from
TC9490F/FA TEBC pin using RC-LPF and inputting DC.
TEBC input voltage:GND~Vcc

I

Tracking error signal generation amp negative-phase input pin

O

Tracking error signal generation amp output pin.
Combining TEO signal and RFRP signal with TC9490F/FA configures
tracking search system.

O

RF signal peak detection output pin

I

AGC/FE/TE amp gain change pin

Connected to Vcc
through 1k resistor

Control signal output

ON

Control signal output

ON

LDOSEL

14
15
16
17

18
19
20

21
22
23
24

VRO

FEO
FEN

RFRP

RFRPIN

RFGO

RFGC

AGCIN

RFO
RFN

GND

ModeGVSW

GND

HIZ
Vcc

Reference voltage (VRO) output pin *VRO = 1/2 Vcc when Vcc = 3.3V

O

Focus error signal generation amp output pin

O

Focus error signal generation amp negative-phase input pin

I

Signal amp output pin for track count

O

Combining RFRP signal TEO signal with TC9490F/FA configures tracking
search system.

Signal generation amp input pin for track count

I

RF signal amplitude adjustment amp output pin

O

RF amplitude adjustment control signal input pin

I

Adjusts RF signal amplitude by eliminating carrier component from PWM
signal (3-state output, PWM carrier = 88.2kHz) output from TC9490F/FA
RFGC pin using RC-LPF and inputting DC.
*RFGC input voltage : GND-Vcc
RF signal amplitude adjustment amp input pin

I

RF signal generation amp output pin

O

RF signal generation amp input pin

I

GND pin

-

CD-RW

CD-DA
CD-DA

1-23

KD-S785

TC94A02F-005 (IC401) : DSP

AD11

32

33

AD10

AD12

31

CKS

30

TESTP

29

VSSR

28

VRAR

27

Ro

26

VDAR

25

VDAL

24

Lo

VRAL

VSSL

VSS

STANDBY

VDD

/oE

23

22

21

20

19

18

17

16

/CE

AD9

VDDT

AD8

AD7

AD6

REQ

VSS

AD13

DAC

34

Bus

register

C-Pointer

register

Y-Pointer

register

X-Pointer

Switch

register

X0 X1 X2

35

36

37

General

Output Port

38

39

40

41

Flag

2sets

Address Calc.

ERAM

2k word

*3

CROM

4k word

Y0 Y1 Y2

DAC

AY

AX

MX MY MZ

MAC ALU

A3

A2

A0 A1

round & limit

round & limit

Audio.I/F

15

AD5

14

LRCKiA

13

BCKiA

12

SDi0

AD4

11

AD3

10

9

SDo

87

VDDT

AD14

/WR

AD16

AD15

io0

io1

VSS

VSSX

AD2

6

/MiCK

543

MiDio

AD1

AD0

MiMD

2

/RESET

1

42

YRAM

4k word

43

Timer

44

4546

47

48

Interrupt

Control

SRAM I/F

49

io2

I-Bus

Generator

50

io3

Timing

51

io4

XRAM

4k word

52

VDD

53

io5

X-Bus

Start

Prog.

54

io6

Y-Bus

DIT

55

io7

56

VSSP

PRAM

256word

57

PDo

Control

Program

PROM

4k*2+2k

=10kword

VC0

58

VCoi

59

VDDP

40bit

Decoder

Instruction

General Input Port

60

61

CK0

VDDX

Microcom.I/F

62

63

Xi

64

Xo

1-24

KD-S785

3.Pin function(1/2)

Pin No. Symbol

1

/RESET

2

MiMD

3

AD0

4

AD1

5

MiDio

6

/MiCK

7

AD2

8

VDDT

9

SDo

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

AD3
AD4
SDi0
BCKiA
LRCKiA
AD5
CE
OE
VDD
STANBY
VSS
VSSL
VRAL
LO
VDAL
VDAR
RO
VRAR
VSSR
TESTP
CKS
AD12
AD11
AD10
AD9
VDDT
AD8
AD7
AD6
REQ
VSS
AD13
AD14
WR
AD16
AD15
io0
io1
VSS
io2
io3

I/O

O
O

I/O

O

O
O
O

O
O
O

O

O

O
O
O
O

O
O
O
O

O
O
O
O

O
I/O
I/O

I/O
I/O

Function

Hard reset input terminal(H:Normal operation L: Reset)

I

Micon I/F mode select input terminal

I

External SRAM address output 0 terminal
External SRAM address output 1 terminal
Micon I/F data input/output terminal
Micon I/F clock input terminal

I

External SRAM address output 2 terminal
Digital power supply (3.3V)

­Data output terminal

External SRAM address output 3 terminal
External SRAM address output 4 terminal
Data input terminal 0

I

Bit clock input terminal A

I

LR clock input terminal A

I

External SRAM address output 5 terminal
External SRAM chip enable terminal
External SRAM output enable terminal
Digital power supply (2.5V)

­Standby mode control terminal

I

Digital GND

­DAC Lch GND

­DAC Lch reference voltage terminal

­DAC Lch output terminal

DAC Rch power supply terminal(2.5V)

­DAC Lch power supply terminal(2.5V)

­DAC Rch output terminal

DAC Rch reference voltage terminal

­DAC Rch GND

­Test terminal

I

VCO select terminal

I

External SRAM address output 12 terminal
External SRAM address output 11 terminal
External SRAM address output 10 terminal
External SRAM address output 9 terminal
Digital power supply terminal (3.3V)

­External SRAM address output 8 terminal

External SRAM address output 7 terminal
External SRAM address output 6 terminal
Squeeze request terminal to host
Digital GND

­External SRAM address output 13 terminal

External SRAM address output 14 terminal
External SRAM write signal
External SRAM address output 16 terminal
External SRAM address output 15 terminal
External SRAM data input/output 0 terminal
External SRAM data input/output 1 terminal
Digital GND

­External SRAM data input/output 2 terminal

External SRAM data input/output 3 terminal

TC94A02F-005

1-25

KD-S785

3.Pin function(2/2)

Pin No. Symbol

51
52
53
54
55
56
57
58
59
60
61
62
63
64

io4
VDD
io5
io6
io7
VSSP
Pdo
Vcoi
VDDP
Cko
VDDX
Xi
Xo
VSSX

I/O

I/O

I/O
I/O
I/O

O

O

O

External SRAM data input/output 4 terminal
Digital power supply (2.5V) terminal

­External SRAM data input/output 5 terminal
External SRAM data input/output 6 terminal
External SRAM data input/output 7 terminal
VCO GND

­PLL phase error detection signal output terminal
VCO control voltage input terminal

I

VCO power supply

-

16.934 MHz clock output terminal
Power supply (2.5V) terminal for oscillator

­Connection terminal for oscillator(input)

I

Connection terminal for oscillator(output)
GND for oscillator

-

Function

K6R1008V1D (IC512, IC513, IC514) : CMOS SRAM

A0
A1
A2
A3

CS
I/O1
I/O2

Vcc

Vss
I/O3
I/O4

WE

A4
A5
A6
A7

1
2
3
4
5
6
7
8

9
10
11
12
13
14
15
16

32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17

A16
A15
A14
A13
OE
I/O8
I/O7
Vss
Vcc
I/O6
I/O5
A12
A11
A10
A9
A8

Symbol
A0-A16

WE

CS
OE

I/O1~I/O8

Vcc
Vss
N.C

Function
Address Input
Write Enable
Chip Select
Output Enable
Data Inputs/Outputs
Power (+3.3V)
Ground
No Connection

3. Block diagram1. Pin layout 2. Pin function

A0
A1
A2
A3
A4
A5
A6
A7
A8

I/O1~I/O8

Clk Gen.

Data

Cont.

CLK

Gen.

TC94A02F-005

Pre-Charge Circuit

Memory Array

512 Rows

256x8 Columns

Row Select

I/O Circuit

Column Select

A9 A10 A11 A12 A13 A14 A15 16

1-26

CS

WE

OE