Sony LBT-A790 User manual

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1

Table of contents

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LBT-A790/A7995

SERVICE

MANUAL

AEP

Model

LBT-A790

E

Model

LBT-A790/A795

Australian

Model

LBT-A795

Tourist

Model

LBT-A790

+

LBT-A790/A795

are

composed

of

following

models.

As

for

the

service

manual,

it

is

issued

for

each

component

model,

then,

please

refer

to

it.

COMPONENT

MODEL

NAME

FOR

THESE

SYSTEM

LBT-A790

LBT-A795

aeP|

it

|

@

[cis]

€

|

ea]

sP

|

my

JE

E

[mx

[aus

POWER-AMPLIFIER

TA-A790N

PRE-AMPLIFIER

TA-A790E

CASSETTE

DECK

TC-A790

TUNER

ST-A790

CD

PLAYER

CDP-M46

CDP-C433M

SPEAKER

SYSTEM

$S-D790AN

AUS

:

Australian

IT:

Italian

MX

=:

Mexican

BA

:

Saudi

Arabia

G

:

German

MY

:

Malaysia

SP:

Singapore

JE

:

Tourist

STEREO

COMPONENT

SYSTEM

ONY.

English

94D0570-1

Sony

Corporation

Printed

in

Japan

Comsumer

A&V

Products

Company

©

1994.4

9-959-479-11

Home

A&V

Products

Div.

Published

by

Home

A&V

Products

Div.

Quality

Engineering

Dept.

NOTE:

@

Items

marked

"*”

are

not

stocked

since

they

are

seldom

required

for

routine

service.

Some

delay

should

be

anticipated

when

ordering

these

items.

Ref.No.

Part

No.

Description

Remark

@

Abbreviations

AUS:

Australian

1-467-614-11

REMOTE

COMMANDER

(RM-S721)

1-501-374-11

ANTENNA,

LOOP

1-501-594-11

ANTENNA

(FM)

(AEP,

IT,

CIS)

1-501-659-11

ANTENNA

(FM)

(EA,

E,

MY,

SP, JE, MX,

AUS)

1-551-734-11

CORD,

CONNECTION

(PIN-PIN)

(EA,

E,

MY, SP,

JE,

MX,

AUS)

1-590-823-11

CORD

(WITH

CONNECTOR)

(3P-11P-11P)

1-690-727-11

CORD

(SPEAKER)

(E,

EA,

MY,

SP, JE,

AUS,

MX)

1-751-179-11

CORD

(WITH

CONNECTOR)

(3P-15P-15P)

1-751-180-11

CORD

(WITH

CONNECTOR)

(11P-11P)

1-765-462-11

CORD

(WITH

CONNECTOR)

(3P-3P-3P-3P)

+

3-350-154-01

CUSHION

(TC)

3-758-344-11

MANUAL,

INSTRUCTION

(FOR

CDP-C433M)

(ENGLISH,

FRENCH,

SPANISH,

CHINESE)

(A795:E,

AUS,

MX)

3-758-394-41

MANUAL,

INSTRUCTION

(ENGLISH,

FRENCH,

SPANISH,

PORTUGUESE)

(AEP)

3-758-394-51

MANUAL,

INSTRUCTION

(GERMAN,

DUTCH,

SWEDISH,

ITALIAN)

(AEP,

6,

17)

3-758-394-61

MANUAL,

INSTRUCTION

(ENGLISH,

GERMAN,

RUSSTAN,

POLISH)

(CIS)

3-758-394-71

MANUAL,

INSTRUCTION

(CZECH,

HUNGARIAN)

(CIS)

3-758-394-81

MANUAL,

INSTRUCTION

(ENGLISH,

FRENCH,

SPANISH,

CHINESE)

(EA,

E,

MY, SP, JE,

AUS,

MX)

*

4-927-355-01

CUSHION

(ST:MADE

IN

FRENCH)

+

4-929-563-01

CUSHION

(CDP-M46)

(ST:MADE

IN

JAPAN)

*

4-944-040-01

CUSHION

(FRONT)

(CDP-C433M)

.

*

4-944-041-01

CUSHION

(REAR)

(CDP-C433M)

4-955-663-51

INDIVIDUAL

CARTON

(ST)

4-956-911-01

LID,

SLIDE

(FOR

RM-S721)

.

4-965-030-01

INDIVIDUAL

CARTON

(TA-ST-TC)

(A790:

AEP,

CIS)

*

4-965-031-01

INDIVIDUAL

CARTON

(TA-ST-TC-CDP)

(A790:E,

EA,

MY)

*

4-965-032-01

INDIVIDUAL

CARTON

(TA-ST-TC-CDP)

(A790:SP)

*

4-965-033-01

INDIVIDUAL

CARTON

(TA-ST-TC-CDP)

(A790:

JE)

‘

4-965-034-01

INDIVIDUAL

CARTON

(TA-TC)

(A790:

AEP,

G,

IT)

*

4-965-036-01

INDIVIDUAL

CARTON

(TA-ST-TC-CDP)

(A795:E)

‘

4-965-037-01

INDIVIDUAL

CARTON

(TA-ST-TC-CDP)

(A795:

AUS)

MX

:

Mexican

G

:

German

MY

:

Malaysia

SP

:

Singpore

JE

:

Tourist

Ref.No.

Part.

No.

Description

Remark

*

4-965-421-01

CUSHION

(TA)

*

4-967-148-01

INDIVIDUAL

CARTON

(TA-ST-TC-CDP)

(A795:¥X)

.

4-967-903-01

INDIVIDUAL

CARTON

(SS)

(A790:

JE)

SERVICE

MANUAL

This

set

is

the

Preamplifier

section

in

LBT-A790/A795.

A-AT90E

AEP

Model

E

Model

Australian

Model

Tourist

Model

SPECIFICATIONS

an

an

Power

consumption

1sW

Audio

input

—_|

Jack

type

Sensitivity

Impedance

Mass

‘Approx.

3.9

kg

(6

Ibs

10

02)

VIDEO

1/MD

|

Phono

435

mV

47

kohms

Dunensions

Baris

perpen

VIDEO

2/DAT

|

Phono

435

mV

47

kohms

(w/h/d,

facluding

projections)

VIDEO3

Phono

245

mV

47

kohms

:

Bey

PHONO

(MM)

|

Phono

33mV

47

kohms

MIC

Phone

ImVv

10

kohms

Design

and

specifications

are

subject

to

change

without

notice.

Audio

output

|

Jack

type

Voltage

Impedance

Abbreviations

VIDEO

1/MD_

|

Phono

235

mV

2kohms

G

German

model

VIDEO

2/DAT

|

Phono

235

mV

2

kohms

IT:

Italian

model

CENTER

OUT

|

Phono

AUS:

Australian

model

EA

:

Saudi

Arabia

model

Nae

5

MY

:

Malaysia

model

Video

input

(phono

jacks)

SP:

Singapore

model

VIDEO

1/MD,

VIDEO

2/DAT,

VIDEO

3

“TEs

Le

rganiat

ehedal

1

Vp-p,

75

ohm

unbalanced,

sync

WS

Maca

Badal

negative

Video

output

(phono

jacks)

VIDEO

1/MD

1

Vp-p,

75

ohm

unbalanced,

syne

negative

VIDEO

2/DAT

1

Vp-p,

75

ohm

unbalanced,

sync

negative

MONITOR

1

Vp-p,

75

ohm

unbalanced,

syne

negative

Le

SAFETY-RELATED

COMPONENT

WARNING!!

Frequency

response

15

Hz

to

20

kHz"

dB

Power

requirements

220—230V

AC,

50/60Hz

(AEP,

G,

IT,

CIS)

240V

AC,

50/60Hz

(AUS)

110—120V/220—240V

AC,

50/60Hz

(,

EA,

MY,

SP,

JE)

120V

AC,

60Hz

(MX)

COMPONENTS

IDENTIFIED

BY

MARK

/\

OR

DOTTED

LINE

WITH

MARK

/{\

ON

THE

SCHEMATIC

DIAGRAMS

AND

IN

THE

PARTS

LIST

ARE

CRITICAL

TO

SAFE

OPERATION.

REPLACE

THESE

COMPONENTS

WITH

SONY

PARTS

WHOSE

PART

NUMBERS

APPEAR

AS

SHOWN

IN

THIS

MANUAL

OR

IN

SUPPLEMENTS

PUBLISHED

BY

SONY.

DIGITAL

STEREO

PREAMPLIFIER

SONY.

MODEL

IDENTIFICATION

TABLE

OF

CONTENTS

—Specitication

Label—

Section

Title

Page

SOTIME

piMCmeL

NOTA

AZO

1.

GENERAL

DIGITAL

STEREO

PREAMPLIFIER

1-1.

Location

of

Controls

.............

aa)

LZ

ZL

2.

SERVICE

NOTE

2-1.

Removal

of

Joint

.....

teeeeeaes

ae

wok

ere

SERIAL

NO.

MADE

IN

JAPAN

|

3.

DIAGRAMS

3-1,

Pin

Descriptions

.

3-2.

Circuit

Boards

Location

ae

F

3:3,

Semiconductor

Lead

Layouts

..

nee

ceeen

AEP,

IT,

CIS

model:

AC:

220V—230V~50/60Hz

18W

G

model

:

SYSTEM

LBT-A790

i

AC:

220V-—-230V~50/60Hz

18W

3-4.

Block

Diagram

.....

pete

sre

auN

10

AUS

model

:

AC:

240V~50/60Hz

18W

3-5.

Printed

Wiring

Boards—Main

Section—

Peer:

EEA,

3-6.

Schematic

Diagram

—Main

Section—

..........

17

MY,

SP,

JE

model

:

AC:

110V—120V/220V—240V~50/60Hz

18W

3:7.

Sch

ic

Di

—Panel

Section—

22

MX

modo!

:

AG:

120V~60H2z

18W

-7.

Schematic

Diagram

anel

Section—

...........

3-8.

Printed

Wiring

Boards—Panel

Section—

.

27

®

Abbreviations

IT:

Italian

model

4.

EXPLODED

VIEWS

Gs:

German

model

.

‘AUS:

Australben

rede

4-1.

Front Panel

Section

.........

eee

uhs

ieatbeenee

gS:

EA

;

Saudi

Arabia

model

4-2,

Chassis

Section

......-..

Gea

stars

fans

34

MY

:

Malaysia

model

SP

:

Sit

Sees

eee

5.

ELECTRICAL

PARTS

LIST

............0..0004

135

JE:

Tourist

model

MX

:

Mexican

model

SECTION

1

GENERAL

This

section

is

extracted

from

1-1.

LOCATION

OF

CONTROLS

instruction

manual.

SOURCE

DIRECT

button

and

indicator

(96,

110)

POWER

switch

(20)

Numeric

buttons

(96,

100,

114,

116,

118)

Display

window

MEMORY

button

(114,

118)

ENTER

button

and

indicator

(96,

106,

108,

118)

MODE

button

and

indicator

(96,

106,

108,

118)

=

CURSOR

CONTROL

buttons

(96,

106,

®@@

108,

118)

|

---

z=

CANCEL

button

(106,

108)

VOLUME

control

(24)

BALANCE

control

(24,

98)

VIDEO

3

INPUT

jacks

(146)

DBS

LEVEL

and

DBS

FREQUENCY

buttons

(24)

DISPLAY

button

(112)

Function

selectors

and

indicators

(42)

P.

FUNCTION

button

and

indicator

(144)

MIC

LEVEL

control

(142)

HEADPHONES

jack

(22)

DSP

MENU

button

and

indicator

(96,

100,

116)

&

IN|

2}

5S

je

=

12]

12)

IS)

i

we

fe

=

ala

Sy

a

lSI=lSIo)

fel

fig

[13]

]

f

(slele)

SECTION

2

SERVICE

NOTE

Note

:

Follow

the

disassembly

procedure

in

the

numerical

order

given.

2-1.

REMOVAL

OF

JOINT

@

Press

the

joint

for

front

panel

and

remove

if

from

POWER

switch,

\

\

@

Remove

the

joint

in

the

|

direction

of

arrow.

POWER

switch

($701)

@

Push

the

button

(POWER)

and

POWER

switch

to

turn

ON.

3-1.

PIN

DESCRIPTIONS

@1C202

LC83015E

(Digital

Signal

Processor)

SECTION

3

DIAGRAMS

Pin

No.|

Pin

Name

|

1/0

Function

1-6

|

P0-P5

_|

1/0

|

General

purpose

input/output

ports

(with

pull-up

resistor).

Not

used.

7

|

ASI

I

|

Audio

data

serial

input

1

pin.

“4

8

BCK1

1

|

Bit

clock

input

pin

used

for

ASI1

input

(64fs

or

32fs

is

applied),

aI

9

FS3841

1

|

384fs

or

5124

input

pin,

Connect

to

GND.

iat

ail

10

LRCKI

T

|

L/R

channel

identification

signal

input

pin

(“H”

for

Leh;

“L”

for

Reh),

Connect

to

GND.

ul

ASI2_

1

|

Audio

data

serial

input

2

pin.

Connect

to

GND.

12

BCK2

1

|

Bit

clock

input

pin

for

ASI2

input

(64fs

or

32fs

is

applied).

Connect

to

GND.

B

VDD1

+5V

power

pin

i

u4—17

[TESTI—TEST!|

1

|

Pins

used

for

tests,

normally

connected

to

GND.

18

VsS1

—

[GND

pin

;

19

TESTS

©

|

Output

pin

used

for

test,

normally

open.

Not

used.

20

RAS

©

_|

RAS

signal

output

pin

used

for

access

to

external

DRAM.

21

CAS

©

|

CAS

signal

output

pin

used

for

access

to

external

DRAM.

22

DWRT

O

|

Data

write

signal

output

pin

used

for

access

to

external

memory

23

DREAD

O

|

Data

read

signal

output

pin

used

for

access

to

external

memory.

4

5

—

|

Not

used.

25-32

|

D7—D0

|

I/O

|

Data

input/output

pins

used

for

communication

with

external

memories

(D0—D3

for

one

DRAM

;

D0—D7

for

two

DRAMs

or

SRAM

or

pseudo

SRAM).

3

vss2

—

[GND

pin

;

34-50

|

A0—A16

|

O

|

External

memory

address

output

pin.

51

VDD2

—

|

+5V

power

pin

52

OSCI

I

|

Oscillator

input

pin

(connected

to

VDD

or

VSS

when

oscillator

is

not

used).

53

|

OSC2

|

O

|

Oscillator

output

pin

(open

when

oscillator

is

not

used

or

external

clock

is

used).

|

54

VSS3

—

[GND

pin

55

FS3840

©

_|

384s

or

512fs

output

pin

(through

output

of

FS384I

or

self-run

oscillating

clock).

Not

used.

56

FS1920

©

|

192fs

or

256fs

output

pin

(1/2

frequency

division

output

of

FS3840).

e

57

FS1280

©

|

128%s

output

pin

(1/3

or

1/4

frequency

division

output

of

FS3840).

Not

used.

58

FS640

|

64fs

or

32fs

output

pin

(1/2

frequency

division

output

of

F$1280

or

through

output

of

BCK1).

59

F320

O

|

32fs

or

16fs

output

pin

(1/2

frequency

division

output

of

FS640).

Not

used.

60

LRCKO

©.

|

ifs

output

pin

(1/64

frequency

division

output

of

FS640

or

through

output

of

LRCKD.

61

~AOWCK

|

0

|

2fs

or

Lfs

output

pin

(1/32

frequency

division

output

of

FS640).

Not

used.

62

‘ASO

0

_|

Audio

data

serial

output

1

pin.

63

AOTDF1

|

©

|

Audio

data

serial

output

2

pin,

Not

used.

=

64

AOTDF2

©

|

Audio

data

serial

output

3

pin.

is

=a

65

SI

1

|

Input

pin

for

serial

data

from

control

micro

computer

(8

bit

data).

66

|

SICK

1

|

Input

pin

for

serial

clock

for

SI.

67

SIRQ

1

|

Serial

input

request

signal

input

pin.

68

SIAK

O

|

Output

pin

for

indicating

that

serial

input

being

executed.

69

SRDY

I

|

Input

pin

for

ready

signal

indicating

that

serial

data

from

control

micro

computer

is

complete.

70

sO

O

|

Output

pin

for

sending

serial

data

to

control

micro

computer

(8

bit

data).

ae:

7

|

SOCK

T_|

Input

pin

for

serial

clock

for

SO.

=

ioe

72

SORQ

1

|

Input

pin

for

serial

output

request

signal.

73

|

SOAK

©

|

Output

pin

for

indicating

that

serial

output

is

being

executed.

Pin

No.|

Pin

Name

|

1/0

Function

74

vss4

—

|

GND

pin

iB

RES

I_

|

reset

pin

(with

pull-up

resistor).

76

INT

1

|

Interrupt

request

input

pin

(with

pull-up

reistor).

Not

used.

-

71

VDD3

+5V

power

pin

78

SELC

|

I

|

Select

pin

(with

pull-down

resistor)

used

to

determine

whether

system

clock

of

L$83015

is

produced

from

F$384I

(L)

or

from

self-run

oscillating

clock

(H).

79

SACK

T

|

Select

pin

(with

pull-down

resistor)

used

to

determine

whether

1/3

frequency

division

output

of

F$3840

is

used

(L)

or

1/4

frequency

division

output

is

used

(H)

as

FS1280.

80

SACK?

I

|

Select

pin

(with

pull-down

resistor)

used

to

determine

whether

each

FS

output

clock

is

|

produced

from

FS384I,

LRCKI

and

BCK1

(L)

or

from

self-run

oscillating

clock

(H).

©1C501

PD78014CW-057

(System

Control)

Pin

No.|

Pin

Name

|

1/0

Function

1

DSP

SRDY

|

O

|

Serial*Handshake

output

to

LC83015E

(DSP).

2

DSP

SI

©.

|

Serial-Data

output

to

LC83015E.

3

DSP

SICK

|

O_

|

Serial+Clock

output

to

LC83015E.

4

DSP

SIAK

I

_|

Serial-

Handshake-

Acknowledge

input

with

LC83015E.

Fr

5

DSP

SIRQ

|

O

|

Serial-Handshake+Request

to

LC83015E.

E

6-8

ae

—

|

Not

used.

9

LATCH2

|

O

|

Latch

output

to

TO9270F

(Rear

DAC).

10

INIT

0.

|

For

Reset

of

LC83015E,

CXD2564M

and

TC9270F.

u

ATT

O

|

Serial-Data

output

to

CDX2564M

and

TC9270F.

5)

SHIFT

©

|

Serial-Clock

output

to

CDX2564M

and

TC9270F.

1B

LATCH!

|

O_

|

Latch

output

to

CXD2564M

(Front

DAC).

:

4

CLK

©

|

Serial-Clock

output

to

LC7822

(Analog

SW)

and

LC7535

(E-Vol).

|

16

DATA

©

|

Serial-Data

output

to

LC7822

and

LC7535,

16

CE

|

Chip-Enable

output

to

LC7822

and

LC7535.

7

vss

—

|

Microcomputer-GND

pin.

;

18—20

= —

|

Not

used

21

GAIN2DB

|

O_

|

For

Front

analog+Gain

adjustment.

(

“L”

is

+2dB.)

22

GAIN4DB_

|

O

|

For

Front

analog-Gain

adjustment.

(

“L”

is

+44B.)

23

GAINSDB

|

O

|

For

Front

analog-Gain

adjustment.

(

“L”

is

+84B.)

24

PD

10

_|

For

Offset

calibration

of

AK5369-VP,

(At

POWER

ON,

for

200msec_*H”

.)

|

25,

26

= —

|

Not

used.

27

|

RECLEVEL

|

0

|

At

increase

more

than

6dB

for

EQ

on

“L”

,

to

control

output

voltage

to

deck.

28

MUTEB-R

|

O_

|

Mute

of

surround

ch

selection

(-1

+

2-2),

At

mute

“L”

29

P.

MUTE

|

O

|

Power-AMP

mute

control

of

Power

ON/OFF.

At

mute

“L”

.

30

MUTEB-F

|

©

|

Mute

(Front)

of

Power

ON/OFF.

At

mute

“L”

.

‘

31

—

[|

—

[Not

used.

[2

vss

—

|

Microcomputer-GND

pin.

:

33,

34

= —

|

Not

used.

;

35

SURR

O

|

Surround

ch

selection

(3-1

“L”

=

2-2

“H”

)

=

36

RECOB

©

|

At

the

Function

is

VIDEO

1

“L”

,

cut

the

output

to

VIDEO

1.

37

RECOA

©

|

At

the

Function

is

VIDEO

2

“L”

,

cut

the

output

to

VIDEO

2.

38

DOLBY

©

|

At

the

DOLBY

PRO-LOGIC

“L”

,

set

the

DOLBY

B

for

surround

output.

3942

=

—

|

Not

used.

Pin

No.|

Pin

Name

|

1/0

Function

B

RESET

|

—

|

Microcomputer-Reset

pin

44

MREQ

I

|

Communication

request

from

~PD78014CW-065.

45

SREQ

0

|

Acknowledge

output

to

wPD78014CW-065.

46

MCLK

1_|

Serial-Clock

from

~PD78014CW-065.

47

|

MDATA

|

1

_|

Serial-Data

from

¢PD78014CW-065.

48

vob

_|

—

|

Microcomputer+5V

power

supply

pin.

49

x2

—

|

System

clock

connection

pin

50

X1___

|

—

[System

clock

connection

pin

5

IC

(VPP)

_|

—

|

Inner

connection

(Connect

to

GND.)

52

XT2

—

|

Not

used.

53

Pod/XT1

|

I

|

Connect

to

GND.

54

AVSS

—

|

Connect

to

GND.

55

INH

0.

|

Audio+Function

output

(See

Fig.

1)

56

FUNCB

O

|

Audio+Function

output

(See

Fig.

1)

57

FUNCA

[0

|

Audio-Function

output

(See

Fig.

1)

58

VIDEO-A__|

0

|

Visual+Function

output

(See

Fig.

2.)

59

VIDEO-B__|

0

|

Visuai+Function

output

(See

Fig.

2.)

60

MUTEA

|

O

|

Amplifier

mute

pin.

At

mute

“H’

.

61,

62

=

—_[

Not

used.

63

AVDD_

—

|

Connect

to

5V

power

supply.

64

AVREF

|

—

|

Connect

to

GND.

pp\

|

VIDEO

1]

VIDEO

2|

VIDEO

3)

TAPE

|

CD

|

TUNER

|

PHONO

55

L

H

L

H

H

E

‘L

36

|

H H

H

L

L

L

L

s7

|

A

H

L

i

H

L

H

-

Fig.

1

p)\

|

VIDEO

1]

VIDEO

2|

VIDEO

3

eb

oe

H

L

39

|

oL

a

H

Fig.

2

@1C601

.PD78014CW-065

(SYSTEM

CONTROL)

Pin

No.|

Pin

Name

|

1/0

Function

1

FLLATCH

|

0

|

Latch

output

to

TD62C950RF

(FLT-driver).

2

FLDATA

|

0

|

Serial-Data

output

to

TD62C950RF.

3

FLCLK

|

©

|

Serial+Clock

output

to

TD62C950RF.

4

FLCLR

|

0

|

Serial+Clear

output

to

TD62C950RF.

5

|

DSPSORG

|

0

|

Serial-Handshake-Request

output

to

LC83015E.

s

6

DSP

SO

|

O

|

Serial-Data

output

to

LC83015E.

7

=

—_|

Not

used.

8

|

DSPSOCK

|

0

|Serial*Clock

output

to

LC83015E.

9

DSP

SOAK

|

I

|

SerialsHandshake

Acknowledge

input

from

LC83015E.

10

|

MREQ

O

|

Communication

request

to

»PD78014CW-057.

[

1

|

SREQ

I

|

Acknowledge

input

from

PD78014CW-057.

rr)

MCLK

0

_|

Serial-Clock

to

~PD78014CW-057.

B

MDATA

|

0

|

Serial-Data

to

¢PD78014CW-057.

u—17

= —

|

Connect

to

GND.

18

KEY-01

|

O_

|

Keyscan

&

LED

Digit

1

19

KEY-02

|

O

|

Keyscan

&

LED

Digit

2

7

20

KEY-03

|

O

|

Keyscan

&

LED

Digit

3

a

KEY-01

|

O

|

Keyscan

&

LED

Digit

4

:

22

KEY-O1

O

|

Keyscan

&

LED

Digit

5

7

23-25

=

—_|

Not

used.

;

26

LEDI

©

[LED

Scan

Segment

1

27

LED2

0

|

LED

Scan

Segment

2

28

LED3

O

|

LED

Scan

Segment

3

29-31

-

—

|

Connect

to

GND.

7

32

vss

—_

|

Microcomputer+GND

pin.

33

VOLLED

|

0

|

Volume

LED

ON/OFF.

34—40

=

—

|

Connect

to

GND.

41

AuBOUT

|

0

|

AU

BUS

output

=

2

=

—

|

Connect

to

GND.

43

1

|

Reset

input

a

44

accuT

|

1

[ACCUT

45

AUB

IN

1

|

AU

BUS

IN

46

|

VOL

DOWN

|

O

|

Volume

Down

;

a7

VoL

UP

|

O

|

Volume

Up

i

48

VDD

VDD

_

9

X2

—

|

Crystal

connection

pin

of

system

clock

oscillation.

7

50

x1

Crystal

connection

pin

of

system

clock

oscillation.

Bl

IC

—

|

Connect

to

GND.

7

52

eat

—

|

Not

used.

53,

54

=

—

|

Connect

to

GND.

x

55

VOL

LOC

|

1

|

Volume

position

56

KEY-IL

I_

|

Keyscan

IN

1

57

|

PEY-I2

I

|

Keyscan

IN

2

i

58

KEY-13

I_|

Keyscan

IN

3

|

59

KEY-I4

1

[Keyscan

IN

4

Pin

No.|

Pin

Name

|

1/0

Funetion

60

KEY-15

T_|

Keyscan

IN

5

él

KEY-I6

1_|

Keyscan

IN

6

|

62

KEY-I7

I

|

Keyscan

IN

7

=

63

~

AVDD

—

|

vpp

64

AVREF

|

VDD

(reference)

_

ei

3-2.

CIRCUIT

BOARDS

LOCATION

VOLTAGE

SELECTION

board

(E,

EA,

MY,

SP,

JE)

MAIN

board

VIDEO

FUNCTION

board

AU

FUNCTION

board

PANEL

board

VOL

board

VIDEO

3

board

BALANCE

board