Akai Aa-r22/l User manual

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STEREO RECEIVER

SERVICE

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MODEL

AA-R22/L

MODEL

AA-R32/L

MODEL

AA-R42

ABBREVIATIONS FOR SERVICE MANUAL

MODEL

AA-R22/L,

AA-R32/L,

AA-R42

ABBREVIATION

A-SW

CK

C-MOS

CPU

fL

FLO

fR

GND

H

INT

L

LD

LPF

LSB

MSB

NC

PLL

POUT

R

ST

SW

SEG

vco

XT

EXPLANATION

Analogue SWitch

ClocK

Complementary Metal Oxide Semi-conductor

Central Processor Unit

Local oscillator Frequency divided

by

PLL factor

Fluorescent Display

Reference Frequency divided by PLL factor

GrouND

High (referring

to

voltages)

INTerrupt (terminal)

Left

Low (referring

to

voltages)

Lock

out

Detection terminal

Low Pass Filter

Least Significant Bit

Most Significant Bit

Not

Connected

Programmable

counter

INput terminal

Phase Lock

Loop

Programmaole

counter

OUTput

terminal

Right

STrobe

SWitch

SEGment

Voltage Controlled Oscillator

Crystal controlled connection Terminal

AA-R22/L

AA-R32/L

AA-R42

STEREO

RECEIVER

MODEL AA-R22/L

MODEL AA-R32/L

MODEL

AA-R42

THIS

MANUAL

IS

APPLICABLE

TO

BOTH

SILVER

AND

PEARL

SHADOW

PANEL

MODELS

SECTION 1 CIRCUIT OPERATION DESCRIPTION . . . . . . . . . . . . 1

SECTION 2 MODEL AA-R22/L SERVICE MANUAL

...........

33

SECTION 3 MODEL AA-R32/L, AA-R42 SERVICE MANUAL

....

47

SECTION 4 PARTS LIST

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

75

SECTION 5 SCHEMATIC DIAGRAM

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

98

SAFETY

INSTRUCTIONS

SAFETY CHECK AFTER SERVICING

Confirm

the

specified insulation resistance between power cord plug prongs and externally exposed parts

of

the set is

greater than 10 Mohms,

but

for equipment with external antenna terminals (tuner, receiver, etc.) and

is,

intended for

[g

or

[A],

specified insulation resistance should be more than 2.2 Mohms (ground terminals, microphone jacks,

headphone jacks. line-in-out jacksetc.)

PRECAUTIONS

DURING

SERVICING

1.

Parts identified

by

the

.&.

symbol parts are critical for safety.

Replace only with parts number specified.

2.

In

addition

to

safety,

other

parts and assemblies are specified for conformance with such regulations

as

those

applying

to

spurious radiation. These must also

be

replaced only with specified replacements.

Examples: RF converters,

tuner

units,

antenna

selector switches, RF cables, noise blocking capacitors, noise

blocking filters, etc.

3.

Use

specified internal wiring.

Note

especially:

l)

Wires covered with

PVC

tubing

2)

Double insulated wires

3) High voltage leads

4.

Use

specified insulating materials for hazardous live parts. Note especially:

1)

Insulation Tape

2) PVC tubing

3) Spacers (Insulating Barriers)

4) Insulation sheets for transistors

5) Plastic screws for fixing microswitch (especially in turntable)

5. When replacing

AC

primary side components (transformers, power cords, noise blocking capacitors, etc.), wrap

ends

of

wires securely

about

the terminals before soldering.

6. Observe

that

wires do not contact

heat

producing parts (heatsinks, oxide metal film resistors, fusible resistors,

e1c

.).

7.

Check

that

replaced wires

do

not

contact

sharp edged

or

pointed

parts.

8.

Also check areas surrounding repaired locations.

9.

Use

care

that

foreign objects (screws, solder droplets, etc.)

do

not

remain inside

the

set.

SECTION

1

CIRCUIT

OPERATION

DESCRIPTION

TABLE

OF

CONTENTS

I.

OUTLINE

OF

AA-R SERIES SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . 2

l.

ACCEPTANCE

OF

INPUT

SELECTOR

DATA

. . . . . . . . . . . . . . . . . . 2

2.

FL

DISPLAY

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

3.

SELECTION

OF

INPUT

SIGNAL..

. . . . . . . . . . . . . . . . . . . . . . . . . . 2

4.

VOLUME

CONTROL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

5.

TONE

CONTROL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

6.

LONG-TIME

BACK-UP

BY

CAPACITOR . . . . . . . . . . . . . . . . . . . . . . 2

11.

OPERATION

OF

AMPLIFIER

SECTION

CONTROL

IC

AA-

I00

PERIPHERAL

CIRCUIT

. . . . 3

1.

AA-100 PERIPHERAL

BLOCK

DIAGRAM

. . . . . . . . . . . . . . . . . . . . . 3

2.

AAIOO

TERMINALS DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . 5

3.

DISPLAY

DATA

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

4.

DIGIT OUTPUT

OF

AA-100

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

5.

DESCRIPTION OF

INPUT

SELECTOR. . . . . . . . . . . . . . . . . . . . . . . . 8

6.

OPERATION

OF

ELECTRONIC

VOLUME

CONTROL

AND

TONE

CONTROL

10

7.

THE

STATUS

THAT

WILL

BE

ESTABLISHED

WHEN

RESET

BUTTON

IS

PRESSED

17

8.

RESET

STATUS

WHEN

POWER

IS

ON

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

17

9.

HOW

TO

MAKE

LETTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

18

ffl.

OPERATION

OF

TUNER

SECTION

CONTROL

IC

AT-600

PERIPHERAL

CIRCUIT

. . . . 20

I.

BLOCK

DIAGRAM

OF

AT-600

PERIPHERAL . . . . . . . . . . . .

.....

20

2.

AT600

TERMINALS

DESCRIPTION

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

22

3.

KEY

MATRIX

AND

TIMING

CHART OF

SIGNAL

FOR

DISPLAY

SELECTION

BLANK

PERIOD . . . .

23

4.

FREQUENCY

DISPLAY

SEGMENT

DATA

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

23

5.

BLOCK

DIAGRAM

OF

PLL

IC

TC9125P INTERIOR

AND

DESCRIPTION OF

THE

FUNCTION

OF

EACH

TERMINAL . . . .

24

6.

PLL

DATA

FOR

PLL

IC

(TC9125P) CONTROL

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

25

7.

FREQUENCY

CONTROL

BY

PLL

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

27

IV.

AKAi

ZERO

DRIVE

CIRCUIT (AA-R42/R32) . . . . . . . . . . . . . . . . . . . . .

28

I.

IN

THE

BEGINNING

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

28

2.

PRINCIPLE

OF

AKAI

ZERO

DRIVE CIRCUIT . . . . . . . . . . . . . . . . .

28

V.

DUAL-POLE

DC

SERVO (AA-R42/R32/R22) . . . . . . . . . . . . . . . . . . . . .

31

----------.SERVICE

MANUAL

AA-R22/L,

AA·R32iL.

AA-R42----------

I.

OUTLINE

OF

AA-R

SERIES

SYSTEM

The AA-R series contains two chips, a micro-computer

(AA-100) for the amplifier section and a micro-com-

puter (AT-600) for the tuner section. They control the

AM

TAP!::

2

TAPE

I

AUX

PHONO

TC91256P

T06l02P

SYNTHESIZER

I·

Volume

INPUT IOdS/step

SELECTOR

( C-MOS) t

Analog

Switch

TC4052

X3

system operations. All controls such

as

input select,

volume, tone control, tuner, etc. which have been done

mechanically

so

far are now done electronically.

Tone

control

section ,I

TC9154P Volume

2d0/step

t-

Serio!

DATA

BUS

A

speker

setector

l

----

AT-600

<:====:i

CPU

for

Tuner

Section Control

AA-100

CPU

for

Amp

Section

COnltOI

0

n

Control keys

for Tuner section

1.

ACCEPTANCE

OF

INPUT

SELECTOR

DATA

The amplifier section input selection

is

in charge

of

AA-100 and the tuner section input selector

is

in

charge

of

AT-600,

but

the band selector also acts as a

function selector for input signal switching, and is in

charge

of

AA-100 which controls AT-600 in order to

stop

all

the operations

of

the tuner section for func-

tions other than tuner and

to

extinguish the display.

2.

FL

DISPLAY

The amplifier-related display and the tuner-related

display consist

of

dynamic lighting

of

duty 1/6

provided by AA-100 and AT-600 respectively.

3.

SELECTION

OF

INPUT

SIGNAL

In

accordance with the buttons, PHONO, BAND,

AUX,

TAPE I and TAPE 2, AA-100 controls the

C-MOS

analog switch (TC4052x3)

to

select the

app.ropriate analog signal.

4.

VOLUME

CONTROL

AA-100 transfers serially the level data corresponding

to the

UP

or

DOWN

action to the volume

lC

to

change the volume level.

A'-,-

--------------------

--~---':>

l,_

___

F_L_◊_IS-Pl-AY

___

_,

Cootrot keyt

for

Amp,

section

Fig.

1-1

AA-R

Series System Block Diagram

5.

TONE

CONTROL

AA-100 transfers serially the data corresponding to

the + or -action

of

the

BASS

and TREBLE

to

the

bass

or

treble

IC

to

change the step.

Since the serial data include the data for chip selec-

tion, the data transfer bus

to

the volume

IC,

bass

IC

or treble

IC

uses in common 3 bus bars, DATA,

CLOCK

and STROB.

6.

LONG-TERM

BACK-UP

BY

CAPACITO.R

AA-100 and AT-600, micro-computers for C

MOS

processing, have very low current consumption in

hold mode, thus enabling long-term back-up

:iy

a

capacitor to be realized.

This provides the last-setting memory which

main-

tains the prior status when the power

is

OFF.

However the volume position

will

be

reset at -26

dB

in

order to protect the speaker, even if the power

went

off

at a volume level higher than the prescdbed

level

of-26

dB.

-------------SERVICE

MANUAL

AA-R22/L, AA-R32/L,

AA-R42-------------

2

t5V

ICI

VOLUME 8

TONE

CONTROL -I -

AA-100

-

~-6V

>

+6V

~

0

AT-600@

HOLD) :

~HOLD

T

i-~

r~

-

I

16

I

16

I

16

0

,,

TUNER

KfY

MATRIX (BAND) 4 BAND 0

""Cl

m

t ..J

.,.

t'r1

II

~

~~TSTROB

2

:,:,

R30

....,

~

Ul

1-.~

CLOCK

3

>,::l

"'

.,.

:ill

~

8 -

DATA

4

::c:

<I)

t'Tj

A•

I~

ui.

:,:,

-

I-

> 0

Cl

82

j§

t""

2

A2

u_

-29V

0:,

POWER OFF MANAGE -9V

t""

0 0

V)

~R2:

trJ

0

~

e,

.,

"'

33

POf

.,,

:-0

C)

" i FLO DRIVE

~

< RIO

osc

L..-

-

+6V

Cl7

n

"'

..

"'

i 0 _l>

m

:::

ii!

u

SEG

9 -

d >

a:

SEG 8

()

s:

~

SEG 7

C')

INT

~

·c:

:J

SEG 6

)>

,,

~

AT-600[

2 "-

SEG

5

I RESET

31

Q:

)>

!:

0

~

.

u.

u

<(

I

.,,

~

....

-

N

I-

o m

?

"Tl

XOVT

z

w

qci'

:I!

f

(!)

ell

"'

-

x,.

<I)

I

N

---

"tJ

(I)

.,.,

I

N

? > I mm

~

I + IC9

LBl294

II

()

►

-

►

0 I

~

0 •

-..;

..

"'

I

,,_

N

(I)

I

....

19

18

17 16

14

12

ii

10

9 • 1 :cO

,s· I

---

::r-

0 I 2 3 4 5 6 7 8 9

10

m2

(I)

I

SEG

....

f::.

L

__

--

II()

5:!l

FLD

0

07

06

00

04

03

l>o

()

:,;-

T,

DIGIT SIGNAL

G,

G2

G3

G4

Go

r-2

0 IC6

LB1294

13

23

26

24

48

FLO

PCB

;;;·

(JQ

FLO

DRIVE

()..;

....

3

-II

,,--,

IIO

:>

..

-

()r-

~

Iv

SR2i

I 7 C

Iv

!SRI -

--

~

_,

l"""'

+5V

·29V

..;

w I

'-'

.j;,.

V,

t'll

~

?S

t'll

;i::

~

r.::

>

r-

>

"Tl

~

<li5'

N

? w

> >

~

:;:,

~

..,,

~ 0

r 0

>

'"ti

<1>

>

...,

~

'Ci'

::,-'

N

~

a

a,

0

n

:,;-

0

p;·

fl<I

...,

p:,

3

-

>

,,

w

t.J

?

(~

'-'

+5V

r

AT-600

HOLO)-E--------,4

TUNER

KEY

MATRIX

(SANDI---------{-~

-

6V

o-----.-(

t6Vi

INPUT

SELECTOR

_·

POWER OFF MANAGE

"f=

-~··

" " u

o

~

R46

*

+5VO--+-+..M--

➔~

s~

i

~

,_

A•

I~

_J

UJ

"'

"

"'

z

0

;::

u

z

::,

u.

INT

RESET

Xour

~7)

x,.

KEY

BOAR0~),(2)

PCB

_______

_

~3~uME

~85~:E

~EMORY

~ADER

I

•

I~

I

L--

-

011

.,.

013

•••

.,.

IC/

AA-

iOO

t (2~T,

DIGIT

SIGNAL

SEG10

SEG•

SEGa

SEGT

:lJ

SEGo

u.

"'

SEGo

ii'.

SEG

◄

i:!I

SEG•

i3

,_

z

uJ

::.

"'

4J

"'

SEG2

SEGt

SEGo

VOLUMES

TONE

CONTROL

...

RH

~

IC3

L81290

FLO

DRIVE

IC4

1/2

LBl290

"

0

~

:It

..

FLO

DRIVE

6V

+35V

•••

[e~l~f

"'

~~J-~

=:

..

..----'-'-=-"'-'-=-""-=..J.=-'-'-=--=-"'-.=;...=...,:.::..icc....i:;:c.,.;:....L;_.i.;:_,=.J=---=....7

FLO

1

G,

G2

G•

Go

L____

J"

-'"

J••

-I"'

·

112

----~

______

_j

KEY BOARD(!) PCB

2.

AAlOO

TER..'1INALS

DESCRIPTION

No. Terminal Description

Function

1

NC

2 STROB

Output

Control

Signal for Elect.

VR

and

TONE

3 CLOCK

Output

at

ACTIVE

"H"

4 DATA

5

CART

(SEGll)

Output

"H"

when

phono

6

SEGl0

7 SEG9

8 SEG8

9 SEG7

IO

SEG6 SEGMENT

DAT

A for Display

11

SEGS

12 SEG4

Output

at

ACTIVE

"H"

i

13

SEG3

14 SEG2

15

SEGl

16

SEGO

17 TS

18

T4

DIGIT Signal

19 T3

Output

at

ACTIVE

''H"

I 20 T2

21

GND

i 22

Tl

DIGIT Signal

! 23

Kl

24

K2 KEY

Input

I 25 K3

Input

at ACTIVE

"H"

: 26

K4

I 27

XIN

Clock OSC Coil I

28

XOUT

29

CK

unused i

I

30

TEST unused

31

RESET Reset

at

ACTIVE

"L"

I

32

INT

Interrupt

Signal

33

POF

Power

OFF

at ACTIVE

"H"

i

34

A2 FUNCTION

SW

Select Signal

35

82

(Bl,

Al)

.........

TUNER,

PHONG, AUX

I

36

A3 (B2,

A2)

.........

Tape I

I

37

B3

(B3,

A3)

.........

Tape 2

38

Al

Output

at

ACTIVE

"H"

39

Bl

40

BAND

Output

"H''

for

Tuner

Band Select when

Phono

and Aux

.

41

HOLD

Output

"H"

for HOLD

of

AT600

42

Vee

+SV

-----------SERVICE

MANUAL

AA-R2~/L, AA·R32/L,

AA-R42-----------

5

3. DISPLAY DATA

Segment data

output

(example: SEG 10

output

when VOLUME 10, TREBLE

IO

and BASS

IO

are lit)

H: LIGHTING

L:

EXTINGUISHING

l~alj

TS

(Grid

5)

T4

(Grid 4) T3 (Grid

3)

T2

(Grid 2)

Tl

(Grid

1)

iSegment Pin Pin J

!

17 18 19

20

I 22

Data

No. No.

1

I SEG

11

5 I

I SEG

IO

6

VOLUMEl0

TREBLE +IO

BASS

+IO

I

SEG9

7 BALANCE VOLUME9 TREBLE

+8

BASS +8

SEG 8 8 FADER VOLUME VOLUME 8 I TREBLE +6 BASS +6

I SEG 7 9 Q 0 VOLUME 7

M2

TREBLE +4 BASS +4

I

SEG6

10 VOLUME6 Ml TREBLE

+2

BASS +2

! I

I

SEGS

11

DUB

Q_Q) VOLUME 5 Frame

of

2

+--

1 ACOUSTIC

I

SEG4

12

I

VOLUME4

ACOUSTIC I

TREBLE-2

BASS-2

I I

SEG3

13

VOLUME3

TREBLE-4

BASS-4

i SEG 2 i 14

AUX

VOLUME2

TREBLE-6

BASS-6

SEG I

15

TUNER

VOLUME I PASS LINE

TREBLE-8

BASS-8

SEGO

16

PHONO i VOLUME0 BALANCE

TREBLE-IO

BASS-IO

-----------SERVICE

MANUAL

AA·R22/L, AA-R32/L,

AA-R42------------

6

4. DIGIT OUTPUT

OF

AA-100

NO.

of

AA-100

'8)1NT

I I 2 3 4 5 6

I I

:,

I

:1

@ Tl I

I I I L

I

11

I

@

T2

I I

.____.....__

_

__;_

____

-'--

_

__,!

I I

@

T3

I I

I

®

T4

I

I I

@

T5

~

BLANX

PERIOO

1.67 x 6 =

IOmsec

Interrupt request

is

made at the repetition rate

of

1.67 msec by the gate oscillator connected to the

INT

terminal and interrupt processing

is

carried out.

Synchronized with this interrupt, digit output with

the timing

as

shown

in

Fig.

1-4

is

obtained at

Tl

to•

TS.

With the interrupts

of

1.67 msec each, the digit data

of

1

is

output for one bit only in the set

Tl

to TS,

and this

is

repeated 5 times. Then, every bit

is

pro-

vided with one O section, and then this cycle

of

6

interrupts in total

is

repeated.

Fig.

1-4

Digit Output Timing Chart

All

the digits

of

key reading and dynamic fluorescent

display are specified by this digit data.

All

the O sections are provided at the

6th

section in

order to match the display

duty

cycle

of

the

tuner

micro-computer AT-600, and no display

or

key

reading

is

available at this section. (AA-100

has

only

Tl

to

TS

while AT-600 has

Tl

to T6, and therefore,

one dummy section without

output

is

prc¥ided to

meet the AT-600 duty cycle.)

------------SERVICE

MANUAL AA·R22/L,

AA-R32/L,.AA-R42------------

7

5. DESCRIPTION

OF

INPUT SELECTOR

CPU

FOR

TUNER

AT-

600

POF

[

REC

TAPE I

PB

[

REC

TAPE2

PB

ICI5

TC4052BP

AA

-

100

ICl6

TC4052BP

TRUTH

TABLE

CONTROL

"ON"

INPUT

B A SWITCH

L L

So

L H

S1

H L 52

H H

S3

I

B3

A3

ICl7

TC4052BP

Fig.

1-5

Block Diagram

of

Input

Switching

Sectio1

-------------SERVICE

MANUAL

AA-R22/L, AA-R32/L,

AA-R42-------------

8

5-1.

FUNCTION

SWITCHING

KEY I

@.

@ ® ®

HOLD BAND

Bl

Al

PHONO H L L H

BAND L L H L

AUX H L H H

Fig. 1-6

Output

Data

of

AA-100

®to@

Fig.

1-6

shows the data

output

from

PINS

®

to

@

of

AA-100 when each function key

is

pressed. This

data

is

output

when

the

status prior

to

the key opera-

tion

is

available in

other

function. When the PHONO

key

is

pressed,

"H"

is

applied

to

A

of

the

analog

switch TC4052BP

and

"L"

to

B,

SI

is turned ON and

the phono signal is selected. Similarly, when the

BAND SELECTOR key

is

pressed,

"L"

is

applied

to

A and

"H"

to

B,

and S2

is

turned ON, and when the

AUX key

is

pressed,

"H"

is

applied

to

both

A and

B,

S3

is turned ON, and the respective signal

is

selected.

In the case

of

PHONO and AUX,

"H"

is

output

from

HOLD (PIN @ ), and therefore,

the

tuner

CPU

AT-600

is

put in hold mode and the

tuner

operation

is

stopped.

5-2. TAPE MONITOR

SWITCHING

A2

@

82

@----+---~

IC

16

(TC4052BP)

"ON"' SWITCH

St

So

S2

5 V

0 V

5 V

0 V

Fig.

1-8

Output

of

AA0100

Pin@,

® (TAPE

I)

Fig.

1-8

and Fig.

1-9

show the

output

of

A and B

and the operation switch timing chart

of

the.analog

switches 1Cl6 and

17

(TC4052BP) when TAPE 1 or

TAPE 2 keys are pressed.

In both cases, the control

data

sections

of

A=

"L"

and B=

"L"

are provided to operate the dummy

switch S0

so

that no oscillating loop due to the short-

circuit

of

the

REC

and

PB

lines can be created.

HOLD

@------------

5 V

0 V

5 V

0 V

~-----'""

40msec,.I

...

__

_

BAND~

Bl

Al

------------sv

--

0 V

5 V

@---------

0 V

Fig.

1-7

Output

Data

of

AA-100 Pin ®

to

@

(When press the BAND key)

If

the same function key is pressed a second time, no

change occurs

in

the

output

of

Pins ®

to

@

of

AA-100, except

that

if

the BAND SELECTOR key

is

pressed repeatedly in tuner mode, the pulse

of

40 msec

is

output

at Pin ® while the S2 (switch for

tuner) ON data remains unchanged

at

Pins @

and

® as shown in Fig. 1-7. That is, it will turn

ON

the

BAND SELECTOR key equivalent

of

the

tuner

key

matrix and the band

is

switched

in

the sequence

...

FM,

LW,

MW,

FM

...

A3

@

B 3 ®

----;-----1

IC16(TC4052BPl

..

ON"

SWITCH s,

So

S2

5 V

0 V

5 V

0 V

Fig.

1-9

Output

of

AA-100

Pin®,

@ (TAPE 2)

------------SERVICE

MANUAL AA·R22/L, AA-R32/L,

AA-R42------------

9

6. OPERATION

OF

ELECTRONIC VOLUME CONTROL

AND

TONE CONTROL

6-L

OPERATION

OF

ELECTRONIC

VOLUME

CONTROL

AA-100 has been given

the

functions

of

controlling

the electronic volume and electronic tone

control

ICs.

VOLUME, BASS and TREBLE control

ICs

are

controlled

by

the

serial

data

from Pins ® to

of

AA-100. There are 3 data bits: DATA, CLOCK and

STROB. The

data

bit

includes the codes, C0, C1 and

C2, for chip selection, and by connecting the terminal

of C0, C1 or C2,

''L"

to

(-)

and ''.H" to

(+),at

each

control IC, reception

or

non-reception

of

incoming

serial data can be selected.

For

the VOLUME IC, all

DATA

CK

ST

VOLUME

ICII

TC9154P

AA-

100

6-2.

SERIAL

TRANSFER

DATA

VOLUME

-o -10

-20

-30

-40

-50

-60

0 2

the codes are specified as "O".

In

this system,

the

following codes are set for BASS and TREBLE.

.

------

Co@

C1@

C2

(J)

I

i

BASS L H L

TREBLE H L L

Fig.

1-10

Chip select Codes for BASS and

TREBLE

ICs

(TC9156P)

'-------------~+6V

Fig.

1-11

Electronic volume and

tone

control

4 e a L R Co Ct C2

TONE + 6

+5

+4

+3

+2

+ I 0

··I

-2

-3

-4

5

-6

L R

Co

c,

Cz

DATA

4 PIN

CLOCK

3 PIN

STR0S

2 PIN

More

tl'l<ln

2so,

sec_

More thon

500p

see

The leading edge

of

the

clock pulse occurs more

than

260 µsec after the data bit

is

set, and at this point,

reception

of

the data takes place. At the trailing edge

of

the clock pulse, the data bit sets the

When

this

is

repeated for

18

bits, the clock

is

turned

I I I

110

µ sec

c>j

!

1.,

7Q)S6'..£__

Fig.

1-12

Serial Transfer

Data

OFF

and after 110 µsec the pulse

of

70

µste

is

output,

and the

IC

chip selected by C0, C

1

or

(2

is

set

to

the

value corresponding

to

the data takei

in.

In the case

of

VOLUME, the

data

of

the 13th bit

is

not

used,

but

O

is

always

output.

-------------SERVICE

MANUAL

AA·R22/L,

AA-R32/L,

AA-R42-------------

6-3. COMPOSITION OF VOLUME

IC

TC9154P

AND

TONE CONTROL (BASS, TREBLE)

IC

TC9156P

6-3-1. Internal Block Diagram ofTC9154P (Volume)

DATA

18

BIT SHIFT REGISTER

CLOCK

5 4 3 2 I

STROB

L-OUT1

CK

L-IN1

:r

::c

u u

I-

<(

'.3

0:

..J

Q.

~

I-

Ii.I

<(

Cl)

I-

::::;

CD

"'z

,_

a:, Ii.I

'0

I-

~!;i

CK

A-GND

CK

L-

INz

:r

u

I-

0:

<(

0:

Q. g ..J Q. 0

Wt"-

IJJ<(

I-

<(

1-:::>

I-

Ill:::>

v,z

iii

z

Ii.I

U)

a:iw

Cl)

I-

~ ~

.,,

I-

(\.I<(

L-

OUH

6

!--------------'

'--------------ll

1R-£:lUT2

Fig. I

13

Internal Block Diagram

ofT:9

154P

-------------SERVICE

MANUAL

AA·R12/L,

AA·R32/L,

AA-R42-------------

11

6-3-2.

Attenuator

of

TC9l

54P

RI

RI=

50K

OHMS

R2=20K

OHMS

The

attenuator

consists

of

diffused resistors and

analog switches. Attenuator

.1

attenuates OdB to

60dB in steps

of

IO

dB

and Attenuator 2 attenuates 2

to

8dB in steps

of

2dB, thus attenuating O

to

66dB

in

total in steps

of

2dB.

0

____

s_,_1"""'1

IL

OUTz

V

ATTENUATOR 2

Fig. 1-14

Attenuator

ofTC9154P

------------SERVICE

MAt'-iUAL

AA·R22/L, AA·R32/L,

AA-R42-------------

l 2

6-3-3. Internal Block Diagram

ofTC9156P

(BASS, TREBLE)

DATA

18

BIT

SHIFT REGISTER

CLOCK

13

12

II 10 9 8 7 6 5 4 3 2

.STROB

c,

C2

C3

~

:::,

u u

a::

a:

0 u

:i:

:r:

u u

I-

< <

...J

~

....

II)

a:)

,..,

Fig.

1-1

S Internal Block Diagram

ofrC9156P

-------------SERVICE

MANUAL

AA·R22/L,

AA-R32/L,

AA-R42-------------

13

6-3-4. Variable resistor

of

TC91S6P

The variable resistor consists

of

diffused resistors and

analog switches.

R:

I OOK OHMS I

TYP}

+6

--------

-6

R/L-2

Fig.

1-

16

Variable Resistor

of

TC9 I56P

------------SERVICE

~ANUAL

AA-R22/L, AA-R32/L,

AA·R42---------------

14

6-3-5. Operation

By entering optional attenuation data from the

DATA, CLOCK or STROB tenninal, the internal

attenuator

is

set. The data stream consists

of

18

bits

as

follows

..

1)

VOLUME

4 5 6 7 8 9

If, for example, the data stream

000100001000011000

is

input

by

the clock from

the data tenninal, the attenuation

will

be

-32dB.

2) TONE Control

10

II

12

13

14 15

16

17

18

Fig.

1-17 Data

of

Volume Control

I+

6 I+ 5 I+ 4 I+ 3 I+ 2 I+ I IO I

-1

I

-2

I

-3

1-4

I

-5

1-6

IL-CH IR-CHICI

CZ

ICJ

2 3 4 5 6 7 8 9

If,

for example, the data stream

000100000000011000

is

input

by

the clock from

the data terminal, the position will be +3.

3) The data stream taken in

is

synchronized with the

STROB signal to set the attenuator. (same for

VOLUME and TONE controls)

Example: Volume

IC

DATA

-16d8

-18dB

10

11

12

13

14

15

17

18

Fig. 1-18 Data

of

Tone Control

- 2

OdB

.__

__

__,

-22d8

CLOCK

_.....J1

....

m11

......

1111

.....

rn1......

un

.....

11

_ ......

111

.....

1111

.....

1111

......

1111-1111_.....,,11-11111-mrn

......

111-1111"'--11

__

__.jJ.U.1111=1111=1111=111LW.1111

__

STROB

CHANGE

OF

ATTENUATOR

-16d8

-18d8

-20dB

-22d8

Fig. 1-19 Relation

of

Data and Attenuator

------------SERVICE

MANUAL AA-R22/L, AA-R32/L,

AA-R42------------

l5

6-3-6.

UP/DOWN

Operation

of

VOLUME

Control

The VOLUME varies

in

steps

of

2dB each from

OdB-

to 66dB and

the

step

OQ

totalling 35 electronic steps.

(IO

display steps for

FL

display)

I)

Step

by

pressing

of

VOLUME Control

a.

The volume moves

UP

or

DOWN

one step

at

a time, thus changing the display accordingly.

Pressing VOLUME during the BALANCE disp-

play will only switch

to

the VOLUME display

at

the existing value without changing it.

b. No action will occur at

MAX

or

MIN even

if

further

UP

or

DOWN

action

is

attempted.

2) Continuous pressing (Holding down the key)

a. After the first 2dB step, the second 2dB step

occurs after 500msec and subsequently changes

in 2dB steps occur every l70msec, and the

display follows. But

if

the pressing

is

started

during

the

BALANCE display, the first display

is

only switched

to

VOLUME

without

changing

its value, and then, after 500msec, the volume

setting

is

changed every l70msec.

b.

The rest

is

the same

as

l

).

6-3-7.

UP/DOWN

Operation

of

BASS

and

TREBLE

Both

BASS

and TREBLE vary in steps

of±5

from

0,

totalling

11

steps.

I) Step

by

step pressing

of

Tone Controls

a.

The value is changed one step

at

a time

to

the

+

or

side.

b. The display

is

changed (point display).

c.

No further action after reaching MAX

or

MIN.

d. All the acoustic memory displays become

invisible and the response line

is

lit.

2)

Continuous pressing (Holding down the key)

a.

After the first one step change, the second step

change occurs after 500rnsec, and then, sub-

sequently the value

is

changed every l70msec.

However

at

the centre value, a 640msec stop

occurs before going

to

the next step. (See

Fig.

1-21)

b. The rest

is

the same as I).

6-3-8.

BALANCE

Control

The Balance value varies in ±

IO

steps from Ototalling

21

steps.

1) Step by step pressing

a.

Change will occur one step at a time to LEFT

or

RIGHT and the display

is

also changed in

sympathy. However operation

of

BALANCE

during the display

of

VOLUME, results in the

change

of

display to BALANCE without change

of

setting.

b.

Once the LEFT or

RIGHT

end

is

reached, no

further action will occur even if the key is

pressed again.

35

STEPS

-5

I

:J

I

1..-

500

m sec

500msec

+

I70msecX34=

6.28

sec

Fig. 1-20 Volume Change

(when

the

key

is

continuously pressed)

I

I<640m sec

➔

l

I

l~oOm

-;.I

.,,.I

170m

sec

2.33sec

Fig.

1-21

Volume Change

of

BASS and TREBLE

L

,------------------

I

2ISTEPS

CENTER

I

R I

I

"1

I

IE

i.,soom sec

I

:.,940m sec

4.33

sec

::,,I

c.

After the key

is

pressed for the last time, the

display is switched automatically to VOLUME

after 5 sec. Fig. 1-22 BALANCE Chr1ge

-------------SERVICE

.MANUAL AA-R22/L, AA·R32/L,

AA·R42-------------------

16

Akai AA-R22/L User manual

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