Pioneer CT-8-R Schematic

(D

rrloN

Erl'

Shown

Ouar?-PLL

Direct

STEREO CASSETTE

Drive/Ribbon

TAPE

Sendust

Head

DECK

eT-tr|trl

lI

GT-8Fl

r

This service manual refers
manual

of the CT-7R

l--rr

(ARP-001-0).

to the circuit

descriptions.

the

photo

is model CT-9R

For

ORDER
ARP

the mechanism discription,

-050

please

see service

NO.

-O

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CCIFIFCIIIATICIN A5 Oxfond Dnive, Moonechie,

N.V. Luithagen-Haven 9,

PTY.

l.rE,.

178-1A4

Antwenp, Etelgium

2O3O

Eloundeny Fload,

Mesuno-ku, Tokyo 1s3,

New iJensey O7O74, u.S.A.

Bneeside. VictoniE 3195. Aust.alie

YZ

Jepen

ODEC.I98I Printed

in

lapan

CIRCUIT

1 .

PLAYBACK

1.1
The

signal
amplified
and

Q1703.

is corrected.

The

output
level-adjusted
then

applied
amplifier,
quency

and the
Q1705

CrO2
tion

of IC601 (HA11226)
is
pin
put
switch
Dolby circuit

1.2

amplified by the mic amplifier, IC1501
4558D),
to the INPUT volume.
PUT
flat
is
Dolby circuit. In
through
(HA11226)

fier. From
recording

1.3

in CPU PD6006,
PA3010

applied
16-bit serial data,

to control the various
data transmission

This is shown in
output from

mission

expansion IC, PM3001,
clock
3001 through

response.

When

will

tape,

will be

The

output

passed

16 of

signal

to

RECORDING

The

signal input to the microphone

volume

amp IC1701

pa.ssed

then

CONTROL

The

control

When

The

16-bit

pulse

After both read

picked

by the equalization

At the

from

by variable

to

Q1705.

Q1705

normal

combination of

out

IC602

then

Q608,

head.

used in the MS function.

to

a mode key is activated,

occurs once each

tape is used,

equalization

set

Q1707

70ps.

from

pin

9. This output

and output from

from

IC602

LINE

PD6006

OUTPUT.

will be

passed

and the signal is then

(NJM4558D).

through the MPX filter

before input to the recording

the recording amp, it is

CIRCUIT

circuitry

pin

serial data is applied to

is

read into the

pin

DESCRIPTIONS

FLOW

up by the

same time,

the equalization

In

functions

also

remain

will

Q1705

in

the

passes

presented

FLOW

via

the

Level is adjusted

Dolby

the

IC602

expansion IC PM3001,

and

is output from

Fig.

7.

2.

(HA11226),

of

are transmitted to PM3001

PM3001

circuits.

1-1. Also

(Data

time the

and the leading

events are completed,

playback

amplifiers,

frequency

amplifiers

resistor

addition to being an

Q1701, Q1703,

to 120ps.

is applied

Dolby

(A

INPUT

this unit is contained

and clock

shift register of PM

VR1703 and

to correct fre-

Q1707

OFF

via the MONITOR

description

later.)

The

circuit, it is

then

wiU be ON,

For metal or

and equaliza-

to

circuit. Here,

is then

pin

key

applied to

pin

9. The out-

jack

selector switch

by the IN-

applied to the

amplifiedsignal

and into

and

applied to the

The key signals

uses this data

the 16-bit serial

5 of PD6006.

a clock

pulse

isactivated.)
pin

edge of the

head is

Q1701

response

is

and

pin

15

it

of the

first

is

(NJM-

the

passed

IC601
ampli-

and IC

as

pulse

is

trans-

3 of the

a STB

(strobe) pulse

then starts transmitting

various

was activated.

circuit operations occurring

activated. Operations
FWD

wise

path

circuik only

switch is changed.

1. STOP Mode Key
Mechanism

will cause
tuming
thus be

Motor

be in
Signal

all ON. This causes
phone

Q309
a

Q302
circuit, and extinguishing the

applied

2.
Mechanism

and R.
This

Motor

a middle
to start turning.

P06006

output

The following

direction

specified, the

The DOLBY

diagram

The 16-bit

SOL L and R

placed

Pin 4

and 5 will be low.

a STOP

Path and other circuits

When

ground potential.

pin

amp

is tumed ON,

tums

to all circuits in a STOP status.

PLAY Mode Key ON

Pin

7 and 8 of PM3001

(Refer

places

Pin 4

is applied

pins

(Refer

sections

of travel.

pin

MUTE

(Fig.

1-1) tums

when the

serial data transmission from PD6006

pin

7 and 8 of PM3001

in a

STOP status.

status.

is high,

9

to be muted. If

OFF, stopping

to

the

the mechanism in the

goes

to a low level,

(M)

level, causing

3 35)S

Fig. 1-1 PD6006

to

control

in accordance

Fig.

to

will describe the various

will be described for

nos.

circuit shown in

position

-Power

ON

OFF.

and the

Q621, Q311,

LINE

OUTPUT and the

placing
When

pins

go

timing chart in Fig. 1-5.)

Data output

pin

1, and PM3001

signals from its

with which

1-3.)

when a mode key is

(Except

will be for PM3001.)

Q313

The mechanism

pin

the REC AMP

REC

low,

while

RM R

where other-

ON

to mute

of the Dolby

switch

11 also

12 and 13

the bias oscillator

ON

to

reel

motor will

and

Q1603

goes

IND.

activating SOL

PLAY

pin

5 is

(reel-motor

t--"=

key

the signal

go

high,

will

head-

high,

input at

go

low,

Muting is

mode.

held

the

all

are

L

at

R)

\ODE

PINNO\

35

34 L H

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33

32 L

rEc

H

H

)LAY

L

D

L H
H

CFF

H
H

H

PD

(

cPu

6006

)

+sv

PULL-UP

HALF

SW

MS

READER

SENSING

M.

REPEAT

I/B/S

T-

PLAY

T-

REC

MODE

I

MODE

tr M/T

RESISTOR

-STOP

M

DATA

STB

SKI

MS

CIRCUT

PA301

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SUPPLY

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FF

REC

RESEI

BIAS M

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MUSIC

BLANK

SEARCH

.J_

INOEXSCAN

MS

/SKIP

REPEAT

PREVENTION

FWD

REV

-rEEC

REC

-r-

PLAY

4

+PAUSE

. FF

REW

_L

-gSTOP

.J-DIR

MUTE

F-R

SW 8/S

REC

SENSOR

PAUSE

FF

REW

STOP SKIP INO

DIRECTION

AUTO

BLE

PAUSE

IND

REC MUTE

tN0

MS

MUTE

M

IND

/R

T

IND

/S

IND

A/S

G N D

REC

t_

HEAO

ffi

vl

L

HEAD

REc

Fig. 1-2

Control system block

diagram

MS

CIRCUT

REEL

MOTOR

CIRCUIT

Path

Signal

When
turn
LINE
pin
constant

PLAY

same

and other circuits

pin 9 goes

OFF, enabling

OUTPUT

goes

16

of the

mode. Pins

state as STOP key

and at

high,

blank

low,

Q621,

sound

the

q324

tums

detector circuit

pin

11,

12

ON.

Q311

to

be output

headphone

ON and

pin

and

and
jack.

enters

13

are in

Q1603

from

When

the time

the
the

PM3OO1

CLOCK

(EXPANSION

AUTO

crRcu rr

CIRCU IT

I

RESET

J lauroRESETl I lsoL.

Gto*'

FF

REC

BIAS MUTE

IC)

r- |

MUTE

I

L

^

il-:l,

{

SIGNAL

CAPSTAN

L

---

MOTOR

REAL TIME
TAPE

RUN

PATH

PA2009

PA201c.

MOTOR

CIRCUIT

NE

,,.o.

|

cr-eR

I

&

MECHANISM

COUNTER
CIRCUTT

HEAD
PHONES

AMP

DOLBY

MUTE

I

oNLY

I

PATH

LI

NE

OUTPUT

HEADPHONES

rI

R

chl

i7

__J

I

3. FF Mode

Key

Mechanism

Pin
SOL L

nism in

goes

7

OFF and

a PAUSE

Motor

goes

Pin
L

in

Signal

Same

4.

REW

4

a

Path

low

STOP

and other

as in

the

Mode Key

Mechanism

Pin

SOL
nism

goes

7

L

OFF and

in a PAUSE

Motor

Pin

RM L
Signal Path

Same

goes

4

ON and

and other

as in

the

5. REC/PLAY
Mechanism

Same

as PLAY

Motor

Same

Signal

When
turned
and

the headphone
muting
signal
and 13
bias

erase head
REC IND

PAUSE

6.

PLAY

as

Path

and

other circuits

pin

9

OFF enabling

is lifted

to be recorded

go

high,

oscillator

and bias

(LED)

Mode

Mechanism

Pin

7

and

8 both

and

placing

OFF
Motor

Same

as

STOP

ON

high

SOL

status.

and

status

circuits

STOP

high

SOL

status.

high

places

circuits

STOP

Mode

Mode

Mode

is low,

from

Q302

and

is

also

Key

the

status.

pin

and

R ON,

pin

5

and causing

status.

ON

pin

and

R ON,

pin 5 goes

and

RM R in

status.

Key

ON

Key

Key

Q621,

output from

jack.

If

the

REC AI\4P allowing

on the tape.

is

turned

applying

to

the recording

illuminated.

(in

ON

go

high,

mechanism

goes

8

low.

placing

goes

high,

RM

goes

8

low.

placing

low.

a

STOp

status.

ON.

ON.

Q311,

and

LINE

pin

11

also

When

ON activating

erase

current

STOP status)

turning

SOL L and

in a

STOp

This

turns

the

mecha-

placing

to turn.

R

This

turns

the

mecha-

This

turns

Q1603

OUTPUT
goes

pins

to the

head.

status.

RM

are

low,

the

12

the

The

R

Path

Signal

Same

illuminated

7. PAUSE

and

other circuits

as

STOP

however.)

Mode Key

Mechanism

Pin

SOL L

goes

7

OFF and

high,

nism in a PAUSE
Motor

Same

as

STOP status.

Signal Path

Same

nated

as

STOP

however.)

8. REC/PLAY
Mechanism

7

goes

high,

and

Pin
SOL L OFF
nism in a PAUSE

Motor

Same as

STOP status.

status.

ON

and

SOL

status.

status.

PAUSE

and

SOL

status.

(The

(in

PLAY

pin 8 goes

ON,

placing

R

(PAUSE

Mode Key

8

goes

placing

pin

R ON,

PAUSE

status)

low.

This

the

LED

ON

low.

This turns

the mecha-

LED

turns

mecha-

is illumi-

is

Path

Signal

When

all

ON. This

phone
Q309

ground

a
turns
Pin

pin

amp

is tumed

OFF,

goes

13

and other

to be

potential.

nate.

9. Direction
Mechanism

Pin

goes
27[msec,

goes
STOP to

goes

7

high. This

and

through

REV-STOP.

Motor

Same

as

STOP

Signal Path

Same as

and

STOP

circuits

9 is high,

causes

Q621,

LINE

muted. If

placing

ON,

When

stopping

high,

Key

low for

causes

since

the

causing

(in

ON

a

SOL

SOL R is

a direction

status.

other circuits

status.

Q311

OUTPUT

pin

the

pins

12

bias

the

REC

STOP

275msec

L to turn

OFF,

operation

and

and the head-

11 also

REC

AMP input

goes

oscillator

IND

status)

interval,

ON for

the

mechanism

from

Q1608

goes

high,

low,

QB02

circuit.

to illumi

pin

and

FWD-

are

at

8

only

Pin

No.

FUNCIION

RM.

5

RM.

HEAD SW

7

SOL.

I

SOL.

9

P B. IVUTE n

to

LINE MUTE

II REC

I2

t?

t4

t6 PLAY

PD

t4 PAUSE

MUTE

BIAS

REC

REW

IND

oo6

STO P

'

FWD

IREV

L L

R

L d

R

IND L

IND L,ora,

IND

-

L

-

t

H

L

L

L

H

(

(or'

t

uooE

(OFF)

(oFF)

(oN

(OFF)

(or'

IOFF)

rorr)

(OFF

OFF)

(oN)

(oN)

FWD

HL

LH

)

)

FF

V

FwD I REV

IRE

L n

n

L

HL

L]H

H H

n H

n

L

L

L

H

L

n

REW

FWO REV

L

L

H

L

L

n

L

L

H H

PLAY

L

M

M

L f,

L

L

L

L

H

L

L

L

L

H H

REC,/PLAY

FWO

REV

L IM

ML

L

L r

L

L

L

n

L

L

n

STO P

PAUS€

FWD I REV

L

L

L

n

H

f, H

n

L

L

L

L

L

L

PLAY

FwD I REV

L

L

L

Hlt-

LH

H H

H H

L

L H

L

L

L

L

REC /PLAY

PAUSE

FWO I REV

L

H

HL

L

IH

L

L

L

L

L

L

Fig.

1-3

PM3001

Output

state by mode

5

Pin

No.

1
2 Xtal

3

4 M.STOP
5 DATA
6
7
I
I

10

11 M/l

12 B/S
13 AUTO

14

15

16 MS MUTE
17 M/R IND

18 r/s
19 B/S IND

20 SKIP IND

21 GND

Symbol

E

xtal

RESET

CLOCK

STB

SKIP

BLE
PAUSE
REC

MUTE

IND

rND

OUT

OUT

OUT

OUT
OUT MUSIC
OUT BLANK

OUT AUTO

IND

OUT
OUT REC

OUT
OUT MUSIC

OUT

OUT BLANK
OUT

22 DIRECTION

23

STOP

24 REW

FF

25

PAUSE

26

PLAY

27

REC

2A

29 REC

30

31 F-R

32 MODE
33 MODE

MUT

REC

Sensor IN REC

SW

I
II

34 T.REC
35 T.PLAY

36

r/B/s

37 M.REPEAT
38 SENSING IN

LEADEF

39

40

MS

HALF

41

42

SW IN

VDD

vo

Used by internal

External
IN
IN Memory

IN
IN
IN REW
IN

IN

IN
IN
IN REC MUTE

IN FWD/REV
IN
IN
IN
IN
IN
IN

IN Tape

IN

CPU reset

DATA output

NC

CLOCK output

NC

STB output
SKIP key

PAUSE

Ms
during

INDEX

SKIP indicator

GND
DIR

STOP key

FF key
Pause
PLAY

REC/PLAY

Mode

Timer REC
Timer

INDEX

MUSIC REPEAT
Sensing

Blank

selection; H level

Cassette loading

+5V

circuit

input

STOP input

scan output

REPEAT,

SEARCH key

BLE

indicator

MUTE

MUTE output, PA301o

blank

REPEAT

SCAN

SEARCH

(directionl

input

key input

input

key

input

key

sensor

selector

PLAY

SCAN,

pulse

leader

signal input

power

Description

quartz

oscillator

terminal f

(effective

PM3001

to

to

PM30O1

to

start

output

output

indicator

detector

indicator

indicator

output

key

input

key

input

key

input

switch input

sensor

switch

switch input

switch input Timer

switch input

BLANK

key

input

pulse

detector

(H

all other timesl

switch

source

:

3.58MHz

low,

normatly high)

(effective

tow)

orrr

--t

SCAN key

scan

output

(effective

output

MS

operation

output

output

(effective

(enabled

input

SEARCH,

inpur

PA2010

input

level

between

input

.'^^ulilAlAlA

STB

(effective

signal

(effective

low)

(FWD:

(from

(Loaded:

PM3001

INDEX

indicator.output

input

(from

l1___1J-

1234

T-'l r-t rr I

UUU

scan output

[

low)

low)

MUTE

(effective

lowl

(effective

tow,

disabled

L;

REV: H)

key

SKIP

pin)

pin

2,

selection in

L ; Unloaded:

rl_

ffi;;,pffi----

output

lowl

lowl

input

PA3010)

Pin

2 - GND

g

- -

- - --_Sf;Lr_

J--L

-L-

---1__J-- --t_r

(low

level

high)

J-l_l-Ll-L

PLAY,

FF,

REW;

H)

while

n

L level

r[_

_J__-L

-Lr

l=]-fr"

reel motor

Reelturnins

*Tape

leader

during

Serial

output

PM3001

KEY

SCAN

output

I ndicator

output

turning

Indicator

output

Mode

key

input

Mechanism

input

SW

Mode

selector

input

SW

mode

input

Key

matrix

input

detected

SW

to

Applicable

Model

CT-gR

o

o

o

o

X
X X

o

\J

o

o o

o
o

CT€R

o
o

o

o
o

o

X

o
o

o
o

o

o

o

o
o

Fig.

1-4

PD6006

Pin

description

Timing

PIN

NO.

,,N

chart

1

FWD

POWER

STOP

ON

Its

STOP REW

STOP

P

LAY

STO P

PLAY
PAUSE

/

STOP

4 RM

R tvl

6

HEAD

7

SOL, L

I )vL. x

I
Zu

gF

*s

g6

9 P

lo

tl

PAUSE
DIR
STOP

B MUTE

LINE MUTE

REC MUTE

R

SW

Tr

L

=

H

H

STOP

H

H

H

Tt

tl

-.,r

l*

PAUSE

,

I

L

L

L

L

L

L

f

Tl

i*M

t2

1F-

*l

PLAY

l*

f2

'l-1

TI

Tr

T2

T6

'Ati

Tll

tl I

t,t I
'lll

-

f

-l

-

_l_

t2

t3

BIAS

REC

SW

L

L

ft:425mS

T2:275mS T!:275mS

Fig.

T4:225mS

T5:tASmS

T6:42SmS T7:42SmS

1-5 Timing chart of PM3001,

Ts:325mS

Te:ZgmS Tto:l25mS

1

7

Timing chart 2

-NooE

PIN

NO.

FUNCTIOiI \-

4

RM

L

FWD

STO

L

P REC

/ PLA Y

STOP

PLAY
PAUSE

/

REC/PAUSE REC /PLAY

PLA Y RECl PLA Y ?EC /PAUSE

STO P

f,

RM.

R

HEAO

SW

7

SOL.

L

R

SOL. R

=

z;
g<

$o

=

9

to LINE MUTE

tl

t2

PLAY
PAUSE
DIR
STOP

PB. MUTE

REC MUTE

AS

BI

L

L

H-

n

STOP

H

H

H

L

Jz-

r9

M

t*

Tg-

r

r

PLAY

t,

+

I

k-!

l*

rl

--l_

-t_

,

t

,

PAU

T9

SE

Tr

I

L

T2

M

fe

|*

a

I

I

I

.l*---

I

I

-l

t:

Tz

It'"

T

Tsr

r8-

f

to-

it

il
t-

Te

-{

I

Tl

t

REC SW

T9

t9 T9

Fig.

T9

Timing chart of

1-6

PM3001,

T9+

2

,9

a

Timing

PIN

chart

---_\MO0E

NO

FUNCTION

4

RM.

5 RM. R

A

HEAD SW

3

\:

L

FWD

STOP tt

L

LT

n

lH

t

rs-

H

REW

H

tM

T5

FF PLAY

lr

lt Fr.

ili

Tt .

M

REW

t

REW

FF

REC

/ PLAY REW

Tl

lr-

r-r

FTz

irl

llTg-

r

Fl

I

7

E
a

2P

ii

H;

9 P

to

tl

t2

t?

SOL.

L

SOL. R

PLAY

DIR
STOP

B. MUTE

LINE MUTE

REC

MUTE

BIAS

REC

SW

H

Tl

Tr

ih

H

I

PAUSE

I

STOP

n

F

H -l

L

L

Fig.

1-7 Timing

Tr

ll

tl

PLAY

il

',

ll

if

I

I

"l

h_

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L

chart

of

I
I

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Ts

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3

I

I

I

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it,

I

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I

t

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t

Timing

PIN

NO.

FUNCTION\

RM

chart 4

L

FWD

STOP

L

REV

STOP

FWD

STOP

FWD

PT^Y

PAUSE

REV

PLAY

/

/

PAUSE

FWD

PLAY

PAUSE

FWO

/

REV

FF

FWD

FF

tt

t2

F

=

I
z

U

=

to

d

5

7

RM

HEAD

SOL

SOL R

F- PLAY

F. DIR
STOP

R-

OIR

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R

R.PLAY

P.B

MUTE

LINE

MUTE

REC

MUTE

BI AS

R

SW

L

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L

L

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n

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it

ii

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U

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I
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REC

SW

DIR:0IRECTION

L

r%;l

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PLAY

I

Fig.

1-9 Direction

Tt:425mS

I

operation

Ta:275mS

T.:275mS

Fig.

F**-l

t"%*--f

(in

STOP status)

T4:ZZ5mS

1-8

Timing

T5:tASmS

chart

of

Fis.

T6j42SmS

PM3001,4

1-10

Direction
status)

T7:425mS

operation

Ts;325mS

(in

PAUSE,

Ts:Z5mS

FF

Tro:t25mS

and REW

10

Timing

chart

5

PIN

NO.

FUt'tCTtOt't-

RM

f,

RM

HEAD

7

SOL.

I SOL.

U

F

s

2

z

=

lo

LINE

tl REC

L

SW

L

R

F-PLAY
F.PAUSE­F.DIR

R-

DIR

R.PAUSE-

-PLAY

R

B, MUTE

IVUTE

MUTE

-

-

-

_

FWD

REW

L

L

H Tz-

L

n

n

d

REV

t!

L

REW

iir

'{li

FWD

REW

u]

i

i;

"il

FWD

PLA Y

T2

Tr

REV

i-l

iii

rr\

rrl

a

PLA Y

t

I
I

l1
T2

i

l_

l-Tz

Tl

L

FWD

il;i-

',

ilT

a

lf

P

LAY

ii

Fig.

t3

1-12

BIAS

REC

L

SW

DIR : DIRECTION

Direction

operation

Fig.

1-11

(in

PLAY

Timing chart

status)

PM3001,

of

5

FWD-REV

-FWD

REV

+

--*

1.4 TAPE
The

the

auto-reverse
transition
portion
to reverse
in a

STOP
fast-forward

LEADER DETECTOR

tape leader

from

of

the tape.

the direction

status

(FF)

The detector

infrared

LED

phototransistor.
ing

a difference
the coated
by the

portion

transparent

The output
to light
shown
transistor.
received

the input
the charge
held

­output from

pil$es
picked
creases
high,
terminal
then
connected
input level
When
the
snaps from
taken

CPU PD
the various
nical

by the

in Fig.

During

by the

level

presenting

low,

terminals

into

up

the

input to

consequently

of the comparator.

goes

high.

the level

+

terminal,

from

functions

and voltage

of comparator.

pin

the light

by the

to

to the

high

pin

6006

mechanisms

stop.

LED

JN---:;:\

Fig.

1-13

detection

mode

the

to detect

coated

It then

portion

directs

oftravel,

when this

or

rewind

uses

an

event

(REW)

optical

whose emission

The

circuit is

in the

amount

of tape,

and the

leader.

pin

from

LED,

1-13

16 of PA3010

passes

and

picked

to be

tape travel,

phototransistor

pin

at

7 is held

pin

at

a low logic

But

2.

as the

path,

phototransistor

pin

7.

This causes

applying
pin 3 goes

As

pin

4

starts

-

terminal

of the

the

output from

to low,

2 appears

uses this

-

terminal

as

output

a high

charging,

and

performing

of

auto-reverse

REFERENCE

_

-l

Tape

t

TAPE

Eb

.5

enase nero

1-6jJl
n lwrrH

PIIOTOTRANSISTOR

leader

detector

CIRCUIT

circuit

functions

point

the
to

the leader

the mechanism

places

or

the

occurs from

mode.

system based

picked

is

activated

of light

up

by detect-

passed

amount

is converted

through

up by the

the

is

low.

3 and 4

input

This

amount

quite

results

the

photo-

of light

small,

This

to

also be

to the + and

in a low

transparent

the

amount

of light
suddenly
pin

3

to

input

to the

Output from

high,

the capacitor

raising

of the comparator.

reaches

that

the comparator

the output

shown

in Fig.

pulse

to control

the

mecha-

and automatic

PIN

wrNDow

section

in

of

unit

the

on

an

by

by

passed

path

so

causes

leader

in-

snap

+

pin

2

the

of

pulse
1-1b.

PA3010

.

a

PIN

NO

t6

4

_--_!'

END

1.5
Since

tape leader
status

or
reaching
activated,
not operate.
the

cassette
difference
between

the

tape,
before

circuit

the

is

When

pulse

is transmitted

(used

to control
PD6006. (This pulse
and

shaped
When
high

this

(H)
PD6006
tape

and

PHOTOTRANSISTOR

Fig. 1-14 Tape leader

.or

1r1-L-=----

l-t

COATEO TAPE

Fig.

1- 1

5 Tape leader detector

SENSOR

CT-9R

detector

go

through

point

the

so normally

However,

tape,

in the

the coated

or in

tape leader

then

activated.

the

reel

into

pulse

level

for

interprets

thus

switches

CIRCUIT

and

CT-8R

circuit,

a direction

where

the

where

or where

infrared
portion

case

the reel

is detected,

motor

from

the reel

is taken

a squaxe

is

maintained

period

a

that to

to the

t,l-e end

end

there

starts

pin

exceeding

detector circuit

o B

r_

LEANR TAPE

waves

are equipped

go

they

into

operation

sensor

sensor

there

is no

is an

circuit

insufficient

transmission

and leader

motor

stops rotating

the end

tuming,
13

of IC

motor)

from

wave

at

to

the Hall

by PA2010.)

either

a low

three

mean

next

the end

mode

with

a STOP

before

cirucit

leader

factor

portion

sensor

a sensing

PA2010

pin

88

element

(L)

seconds,

of

of

opera-

a

is

will

on

of

of

or

the

tion.

l4

If

?

(FF),

is

it

reverse

If

the mechanism is in the
rewind
mode.
presently

(REW),

or

the next mode entered is STOP.

in the PLAY mode and the

fast-forward

record-playback

(REC/PLAY)

mode switch is selected, it also enters the STOP
mode. But if
a direction

are selected, if first

?

Q

,

operation, then into

goes

a PLAY

through

status.

Consequently,

pin

13 is at

high

output.

when an

a low level,

output

This
function operations
BLANK SEARCH,

PMS MUTE""'

L

MUSIC REPEAT).

(PIN

(8LANK

II)

input signal

and no signal

is

produces

is used by each

(MS/SKIP, INDEX

OPERATION )PMS

SEARCH

MUTE

present,

of the

SCAN,

',,'H

(

PIN

I I )

a

RIGHT

REEL

MOTOR

HALL

ELE MENT

1.6 BLANK
When

reel
goes

the

motor starts tuming,

to a low level. When
of the blank detector
lifting MS

PA20to

Fig.

1-16 End

DETECTOR

function key is

IC

(Music

Search) muting and commenc-

ing MS operations.

As
fied,
mined by the
parator

MUTE is lifted, the signal is first ampli-

MS

then applied to

pin

comparator

output at

point

Fig. 1-18.

This output is used

to tum Tr1
turn allows capacitor C
dump its charge through

Tr1.

a low level.

When there is no input signal
OFF, capacitor C
mately
pin

7Omsec

13.

starts recharging, and approxi-

later, a high level is output from

_|LJ-L

P06006

diagram

sensor

IC PA3O1O

placed

pin

pin

16

(PA3010)

and its level is deter-

9,

in the next

is

A

as shown

connected

Thus,

present,

OPERATION

ON, and the

16 of PD6006

goes

low,

goes

also

stage. Com-

ON, and

pin

to

pin

13

Tr1 turns

pin

low,

in the

this in

!2

goes

11

to
to

9

,,1,l,..1.,,'..,,. .[h/1.,,.

ll

W mlffi ilW

lwwmm mffiilffi

5V

70ms+

-Fr

2

4vf\'

2.5V

3

I

FUNCTION KEY OPERATION

1.7
The various functions

BLANK SEARCH, MUSIC REPEAT)

placing

by

The timing chart for the

10, 11, and 12 of CPU
1-19. As a
tion, a

pulse

the CPU.

pulse

the

mode accordingly.

t1 t

t-t

Fig.

Blank detector

1-18

(MS/SKIP,

the respective key to the ON

pulses

PD6006 are shown

function key is

placed

train is input to either

The

train, and starts

then determines the timing

CPU

operation of the

_J-----r_

-1_I-

-l

r

!e-l

i-

-LJ-

waves

INDEX

output

in the ON

pin

c+

ll,, r,,1. .

--1'

prllrl'n

L

SCAN,

are activated

position.

pins

from

in Fig.

posi-

or 37 of

36

selected

_J---L

-1J-

--l
f

-Lr

of

Fig. 1-17 Blank detector

circuit

Fis.

1-19

MS/SKIP Operation

1.
When

(

>>

a

music
drops
pulse
sets

the MS/SKIP

key is activated,

)

selection

high to low. The

from

effecting

the

the REWIND

is located,

level drop at the

mode
back to the beginning
the PLAY mode.

A=57!S A=AOIS. Cr27oS

Function key diagram

placed

Key

and

is

when

pin

ON,
beginning

the

of

13

trailing edge

PD6006

rewinds the tape

and

of

the selection,

FF

the

of

PA3010

the

of

pin

and enters

At the end

section

of the
output from
level

continuously

then

selects

until

the beginning

the

level

at

back

out to

enters

2.

operating
mode
The
to locate
into
starts

the PLAY

INDEX

When

is entered;

unit
the PLAY

and

INDEX

in

then

the beginning
continues

of PA3010

of

the selection, if

tape

pin

13 from

high

the

FF mode,

pin

13 low. It

the beginning

mode.

REW

Fig.

1-20 MS/SKIP

SCAN

Operation

SCAN

the

FWD

if in

REV,

cycles

mode.

for

is held

low.

(functioning

low to high) holds

for over

8 seconds,

continuing

of the

next
then

of the

operation

is activated,

direction,

(

REW

through

of

a

search

a selection,

Playback

the

7

seconds

the unrecorded

to change

PD6006

in that
selection
rewinds

selection,

if

the

<<

mode
drops

(

<<

the

unit

(

FF

>>

is entered.

)

and

operation

goes

then

of

the selection

pin

that

the
the

18

D

I
R
E
c
T
I

N

After
retums
through
tions on

If the
FF, or

)

entered,
search
switch

When

(FF

SCAN is

this 7

to the FF

seconds

or

another search operation

tape

the

are thus indexed.

tape should end

REV

REW,

either the

or a direction

to continue,

depending on

setting.

KEY

in INDEX

in

REV

operated

SCAN operation,

direction)

in

REW mode

has

elapsed, it

REW

mode

while the unit

STOP

status would be

operation

the reverse mode

placed

is

as

once again

and cycles

until all

in FWD

is

would

REW

ON,INDEX

shown

selec-

allow

KEy

in Fig.

r-2t.

3.

BLANK

When

if

the unit
search
ing

in

REV, it

When

13

of PA3010)

the

tape end

is

)

tion of

position

the
snapped

From
mode
the
high

until

blank

level

status, completing

As

shown
recorded
REW

mode
seconds

When

the

leader

mode

and

SEARCH

the BLANK

is

operating

is

started in

is

input

to

sensor is

travel

is reversed,

where

from high

position,

this

point

a
detector
for

4

in Fig.

tape,

the

after

in FF

mode-

detecting

tape

goes

then

Operation

SEARCH

in

the FF

started in

the blank

is held

high for

detected,

input

low.

to

the unit

is

reached

is maintained

seconds.

the

operation.

L-22

tape

retums

the search

the

tape end,

portion

into

the FWD

(

>> ) mode;

the

detector

and the

to the

It then

(3),

had

for

a

STOP.

key

placed

is
direction,

if

operat-

(

REW

8 seconds,

the

(output

present

<< ) mode.

by

or when

tape returns
blank

reenters

detector

the PLAY

where the input

at

a continuously

goes

into

a STOp

in

case

of

the un-

to

0.8

i.- e

the tape

been

the

seconds

sec

done for

tape

-l

end in

travels

in FF

ON,

the

pin

direc-

to

at

8

Fig.1-21

INDEX

SCAN

REW KEY ON

operation

l

LEADEFi

Fig.

i I D.

r8

1-22

BLANK

sec

PLAY

=

SEARCH

operation

IAPE

ENO

4.

MUSIC

REPEAT Operation

When the MUSIC

while the unit

present

the
recorded
then
Iow

tape selections) continues to completion,

the output from

to high.

held high f.ot

beginning of that

This

operation may be repeated

is

music selection

After the

2.5 seconds, the unit returns
selection and

selection for up to

REPEAT is

The

end

sensor

STOP

is

cleared and a STOP status

status will

activated.

in the

(or

13 of

key is

PLAY

the next if un-

PA3010

pin

REPEAT

presently

pin

output of

repeats

for

8 times, after which

also be entered in case the

placed

ON

status,

goes

from

13 has been

to the

playback.

the same

MUSIC

entered.

out

put
t

......*

Input

Fig.

1-23

DOLBY

1.8
The CT-9R

C Dolby

type

type C

The

reduced

be

7l<Ilz.

for the

as
difference
cessor

by up to

The basic operating

type

lying in the

stages
stage connected
B Dolby

tapes to

NR

be

and decoding operations

and L-26

L-25

input/output

Fig.

in

The

1-24.

REC
skewing circuit
resonator with an
prevent
level

processor

low to mid-range decoding

leakage) due to high

The

REC

stage

rnto 2 signals, the main

MUSIC REPEAT operation

PROCESSOR

NR

CT-8R

and

processors.

NR

Dolby

both

NR system

20dB

principles

B Dolby

NR system,

use

(a

high

level stage

in series).
processor
played.

enables

also

Block diagxams

are outlined

respectively.

frequency response curves are

passed

srgnal

is

(see

Fig. 1-25) which is an

for

2OWlz, and designed

at

level

signal is then

(high

level stage)

signal being

to adder A, while the main

(side

SCF-1

chain
shoot suppressor C
A where the main and sub

filter),
before

signals are

feature

frequencies

at

type B and

enables noise

above

the same

are

to

the major

to a

encoded

B

encoding

Ftgs.

in

pro­level
type

of two

and

Switching

Wpe

corresponding

The

separate

a low

for

shown

through a

spectral

LC

to

error

(high

signals.

it is

passed

is

B and

the lst

divided

directly

via

over-

applied to

where

passed

signal
arnplifier
being applied to adder

recombined.

Fig.

In addition, the amplifier B output is applied
rectifier E
fier

D, the rectified output being applied to

(voltage
variable
response is

(non-linear

control resistor) of

high-pass filter

varied according to
The VCR value
ditions, and the

determined

by
output will thus
signal level
range will

be

InpuVOutputcharacteristic

1-24

integrating type)

SCF-1.

This

where the

the VCR

is increased

SCF-1

CURI. The

be

(around

under

tumover

level

10dB

higher than the

1.5kHz), and the

low

frequency is

of the adder A

contracted. The VCR value

to

via ampli

VCR-1

is

SCF

frequency

value.

level con-

main

dynamic

will drop
when the VCR control voltage exceeds the
threshold value, and the SCF-1 turnover

frequency
will be increased by C2lC!lR2lVCR-1, thereby
attenuating

low to

mid-range
signal. And since the sub to main signal
lower

degree

higher input signal

at

dynamic range

of

The adder A output

processor
whose dynamic
compressor stage
compress the
stage,

the
VCR-2 control
ing level of the 1st
processor
circuit R.
the same

(low

stage

level stage)

range

is

added.

was

dynamic range

threshold level of the 2nd

voltage is set

processor

stage also

purlpose

The

includes an anti-saturation

of this circuit

improvements

signals in the sub-

ratio

frequencies,

conhaction

is

applied

is smaller.

to the 2nd

the

where the signal

compressed in the

lst

In order to further

in

this

2nd

processor
processor

below the corespond-

stage.

The 2nd

is to effect

as the spectral skewing

circuit.

During

circuitry

1st and

Since
inverter
loop is

playback

is used as

processor

2nd

the circuit

(sub-signal

formed with the sub-signal

(se

Fig. t-26), the

in recording mode,

in

stages

starts

from the output of the

output), a

the

negative

being

same basic

but with the

reverse order.

feedback

subtracted

a

is

15

from

the main

path

signal
recording
characteristics

signal in

operation

adder

is exactly the

mode, the decoding

complement
more, the anti-saturation P
characteristics during

decoding

A'. And

since the

same as during

and

each

other. Further-

and

spectral de-skewing

are the exact

sub-

encoding

opposite of

during

encoding.

the conesponding characteristics

Consequently, a flat

response is maintained at all

of the

encoding

and decoding

completed.

levels

opperations

frequency

after all

phases

are

REC IN

P.B.

IN

processor

lst

I
i

scF-

procesor

2nd

A'

Adder

Overshoot

i- tl

D'

Amp.

(high

levet

stagol

Inverter

Adder A

|

Amp. B

Inverter

r\ : I l-l

Overchoot

suppressor

C

g):.,!-

FiS.

t-ZS

(low

lnverter

C'

Amp.

-l[}r*

Rectifier E'l

Block diagram for

lanel

stagel lst

Anti­saturation

scF-2

B'

t+

+

P

2nd

| |

ii
rl

ll
tl
tl

gl

rl

tl
tl

ii

tl

ll
tl
tl

rl

encoding

processor

I

I

I

I

I

I

I

I

I

I

Overshoot

I

I

suppressor

I

I

I

I

I

J

I

I
I
I
I

;"".iri"reE

processor

salgelenR

saruralton

R4

(low

Ft

c6

,thln

iJn""tirier

operation

(high

Adder A

C

Amp.

||

level

Adder

Amp.

B'

lovel

stagel

I

-l*L

stagel

A'

Overshoot

suppressor

L=

E,

Amp. D,

scF- |

REC

OUT

Spectral
de-skewing

PB.

OUT

16

Fig.

1-26 Block diagram

for

decoding operation

1.9

AUTO BLE

Auto BLE

recording

level and equalization

CIRCUIT

provides

the

recording characteristics
type formulations.

When

the AUTO key is
mitted from
initiating

mechanism
recording level.
Bias is
mined
to
and
The

set by detecting the

by subjecting the

record/playback

selecting which of

resistance

This adjustment

four

times. Then after

Operation is

PD4010

operation and coarse-adjust

It

then shifts to bias adjustment.

at 16 step levels

the 16 bias strengths is best.

of the bias circuit is

cycle may

function

of

setting

bias,

to obtain the ideal

exhibited

pressed,

by the

fully

a signal is

various

automatic.

trans-

to control IC PD6006

ideal current, deter­tone

lkHz

oscillator

intensity

of

signal

set accordingly.
repeated

be

equalization has

up to

been set,

in

the

tape is rewound

complete

20

seconds.

In
AUTO BLE
The

adjustment

case one of the adjustments is

to make, it is automatically

is

tape

then rewound and

to

process

set.

The detection
adjustment consists

method used for each value

passing

of

signal through the Lch

and

comparing
analog voltage
passed

through

obtained from

them
the

(with

D/A

are contained in PM9001.

the

starting

requires from

position.

10 to

impossible

The

for

disabled.

standard

the

values

are

record/playbaek

and Rch rectifier circuits

comparators) with

a CPU digital

converter. These

an

sgnal

circuits

SIGNAL PATH

}IEAD

PM900

MECHANISM PATH

LI NE

OUTPUT

C LEAR

I

CONTROL PATH

n.

osc

Fig.'l-27

B.L.E. circuit block diagram

17

The

REAL

CT-9R

1.10

the rotational
pulse

signal

and

real

time

Tape

Counter

o

Tape

counter

oN.

1.

When
ON

the

during

cunent

2.

charge
Q1206

C1218.

collector

3. This

low

(PD6008).

pin

and

4.

This

output

inverting

5.

setting
Thus,
the

the

the

time

TIME

uses

speed

PD6008

to

counter.

Function

set to

power

pass

to

being

is

at a low

signal

Pin

19 is

amplifier
display

tape

power

COUNTER

a HaIl

of

the reel

"0000" at

switch

the

100ms

through

ON

also

level.

is

applied

13

thru

low.

passed

is

to

counter

is

applied

element

sensor

carrier,

for

use

by

the tape

the time

is turned

interval

+B,

R1214,

qL2O7

turns

pin

to

18

of IC904

to LED

of

ICg0b (Mb4b1?p),

"0000,'.

restarts

to

the unit.

from

to

detect

and

inputs

counter

power

is

ON,

e1206

required

R121b

ON,

and its

B of IC904

are high,

1101

via

.,0000"

a

turned

is

for

and

the

at

o

Tape counter

1. As

shown in Fig.

ted

by the Hall element
the right
17 of lC2O2

increment/decrement

reel carrier is

(PA2010)

13.

2. This output

is

(PD6008).

3. At the same
element
6 of IC903
pin

7.

4.

This

output

5.

Signal input
data

to be transmitted

(active

pins

by
display

time, the voltage

(H251

: HA)

(NJM2903)
is applied

pins

to

high),

and digital

26 thru 29.

of the tape

6. When the tape is

tion, the
with

pulse

each tum

shown in

of the reel,

to increase.

7. When
tion,

with each tum

the tape is

pulse

the

shown in Fig.

of the reel,

to decrease.

"nnnn"

L-29, the Hallvoltage

(H252:

applied

and is

applied to

HB)

pins

to

output from

pin

32 of. IC904

generated

is applied

to

and is output from

pin

to

and

30

by

data to be

This changes

30

32 cause segment

pins

13 thru

transmitted

the numerical

counter.

traveling in

Fig.

the

1-29

FWD

causing the

traveling in the

REV

1-29

causing the

genera-

built

into

16 and

by Hall

pins

5 and

of

IC904.

direc-

is applied

counter

direc-

is applied

counter

pin

1g

IC9o4

PrN

30 rNPUl|

rcao4

',1u,i3.,

f--'l fi --.1

J

Fig.

1-28 Tape counter

'no

16r)-l

l\<tYl

L_t

LJ L

Ll l_J

COUNTER

INCREMENT

function

too

coLUMN

(

UNITS

)

to2

coLuMN

(

HUNORES

)

ro!

coLUMlt

(

4-

PULL-UP

rHousaNDS

R€SISTOR

)

"ula=-ol

lC904

PIN

30

JI-I]JA

IN PUT

IC904

PIN

L

32

INPUT

Fig.

1-29 Tape counter

increment/decrement "nnnn"

ROTOR

MAGNET AND

HALL

ELEMENT

RELATIONSH

IP

HR

7C202

13

PIN
OUTPUT

ffi

m

18

a

Counter reset

1. When
placed

a

pin

2. Thus,
counter
"0000".

IC904
the counter

Real

the counter

pin

ON,

low level,

and

19low.

when 51101

unconditionally resets the counter to

However,

continues, and when

will

Time Counter Function

reset

41 of IC904

pins

13 thru 18
is

held

real time operations by

once

again

When the Counter/Mode

placed

tape counter or real time

ON, the counter can be

Placing

1.
(PD6008)

51102 ON causes

to drop low.

counter operation.

2. This causes a high output from

illuminating the

Q921

ON,
indicator.
If

3.

the tape is traveling, voltage

right

reel carrier Hall element
input to
and output is

4.

At the same time,
element
applied to
from

5. The outputs noted
pins

to
they are
amount of tape

output

6. During the few

cessing is
no data

output from
and low, switching
the dot

pins

5

and 6 of IC903

from

voltage

generated

the

and 3 of IC903, with output

pin

(HA

pins

1.

obtained

:

H253) of

2

in 3 and 4 above

and

30

from

31 of IC904

processed

time

pins

13 thru 19,

to obtain data on

remaining.

second interval

taking

present

place

in step 5 above,

in IC904, and this causes

pin

2O to vacillate between high

ON and

Q921

indicator to blink. This reports initial

data acquisition.

7. During the time
numerical display will show

the
data,

switching to an accurate

calculation result a

8. As the

processed

dot indicator is blinking,

the

few

seconds

data is stored in IC904,

20 will be locked high and

keeping the dot indicator

ON

reports the

This

real

ing

time.

9. Remaining

during

tape

10. The unit
PLAY
second

mode

units

1l.If during tape

fact

that the counter

tape time is continually

travel to update

indicated by the counter during

is seconds.In the FAST mode,

shown.

are

travel, the

mode is entered. the counter

switch

(S1101)

(PD6008)

go

high, with

down,

S1101

indicate

switch

switched

pin

the tape

is released,

real time.

(S1102)

to eigher

40 of IC904

pin

20

LED1101 dot

generated

(HA:

H251)

(NJM2903),

pin

7.
by the Hall

left reel

carrier is

are applied

(PD6008)

This data is

and 26 thru 29.

that

data

OFF causing

preliminary

display of the

later.

Q921

will

illuminated.

is indicat­processed

the counter.

STOP

or

will hold the

drops to

to turn

by the

where

the

pro-

there

the

pin

remain

the

10

PAUSE

is

is

is

point

value at the

l-2. When the

tape reaches the
the counter, the
for

approximately 30

slight

differences

the tape may continue

o

allow

CAPACITY switch

TAPE

TAPE

The

for

various tape

CAPACITY

the tape time remaining
ON and OFF
and

39

o

Tape travel direction indicator

produces

of IC904

Fig.

1-30

LED indicators are

can determine whether

FWD or

1. During

direction.

REV

the FWD mode of travel, the

signal waveforms

is

(PD6008)

are as shown in Fig.

2. These signals cycle through

of entry.

"00.00"

"00.00"

in

display will be

seconds

length

tape

to account

traveling).

switch

lengths to

(S1018)

processed

be

display. Switching S1018

the logic

(PD6008)

levels at

shown in

Tape capacity switch

provided

the

from

so that the operator

tape is traveling in the

pins

9 thru L2 otIC9O4

1-33.

Q914

point

(even

is used to

Fig.

thru

held

for

though

for

pins

1-30.

output

Q916,

on

38

turning them ON and OFF, thereby illuminat­ing D1

of

tion
During the

3.
signal waveforms
IC904

4. These signals cycle through
turning them
ing D4 thru DG
of

tape travel.

5.

blinking rate

The
by

the mode the mechanism

information

D3

thru

to indicate

tape travel.

mode of travel, the output

REV

(PD6008)

are as shown in

ON and OFF, thereby

indicate

to

of D1 thru D6

is received through

from

the forward direc-

pins

9

thru

Fig.

Q914

thru

illuminat-

reverse direction

the

is determined

is in,

pins

and this

thru

33

of

L2

1-34.

Q916,

37

of IC904.

19

REV

PLAY

REW
PAUSE

Fig.

1-31 Tape travel

direction

indicator

FwD rNDrcaroR

+

TNoTCATOR

REV

€

MECHANISM

o
3

r

G

a

Memory

MODE

P

STO

REW
PLAY

FEL

PLAY

PAUSE

PAUSE

REC
PAU

SE

STO P

REW H
PLAY
PLAY

PAUSE

PA

USE H H H

Fig.

1-32

stop

When the MEMORY
ON, the tape
in
reaches

the

fast

"0000"

may

mode, automatically stopping

on the tape counter.

33

L

L H

L H H H

L

L

L

L

H

H H H

n

be

PD6OOB PIN

INPUT PIN

34 35

H H

L H H SEE FlG.

H

L

L H H

H

L H

H H H
H H H
n L H H

H H

H H

L

PD6008

input/output

switch

(51001)

moved ahead or backed

AIso, when the counter indicates real
tape can be moved in
equivalent

to

"0000",

fast

the

mode to the

where it is automatically

stopped.

1. When the tape is
level output is
(PD6008)

produced

when

in the

fast

travel

from

the tape counter reaches

"0000".

2.

This output
(S1017),
where it is

3. The low input
written into
the

STOP mode.

passes
and
applied to

IC310 to

via the

S1001 to IC310

pin

pin

at

place

4.

4 signals

the

No

37 9

H

H

H

H

H

L

H

L

L
H H H H

H
H

OUTPUT PIN

H

FlG.

SEE

FlG.

iEE

H H

FlG. 1-33A=6OmS

SEE

FlG.

SEE

iEE FlG. 1-34A=5OOmt

H H

table

placed

is

when

time, the

point

mode, a low

pin

25 of ICg04

TIMER switch

(PD6006),

program

the

mechanism in

tl

H

1-33A=6OmS
1-34A=60mS

1-33A=50Omt

1-34A=6OmS

up

it

P06008

t2

H

H

H

PIN

PIN IO

PIN II

PIN

Fis.

P06008 ( rC904

PIN

PIN

PIN I I OUTPUT

PIN

Fis.

llowever,

4.
REPEAT, BLANK
switches is
a

STOP command even

present

WHEN

(

IC904

)

9 OUTPUT

OUTPUT

OUTPUT

I2 OUTPUT

1-33

9 OUTPUT

IO OUTPUT

12 OUTPUT

1-34

]_I----a

T

ru

OUTPUT

Output signal

)

-l___J-----l

ru

Output signal

if one

activated, IC310

pin

at

4.

rN

SrOrT

REC, METViORY

Fig.

1-35 Memory stop

-l

ro

t-J

SIGNAL

WAVEFORM

waveform 1

l*o'1

L-J

-L----J-

OUTPUT

SIGNAL

WAVEFORM

waveform

of the

MS/SKIP,

SEARCH oT

will

with a low

STOP DTSABLED

1

2

2

INDEX

not

STOP

COMMANO

TO

MECHANISM

MUSIC

SCAN

transmit

input

20

1.11

determined
cycle

generator
verts
at
rms,
40dB

CAPSTAN

The

rotational

by

integral

(FG)

the frequency

this frequency

and

this

value

by the

FG

the frequency

type

built

circuit (PA2007)
form

output

The
converter
put

occurring
equivalent
11

of PA2007

from

of

The

passed,

!2

to PA2O72
spectively.
fed

to

rotating

The

by

the FG.

next

stage

designed

through

voltage.

as

a DC voltage.

voltage

along

output

with

and input

There

the

motor

speed.

motor

is

a 4-phase
electrically phased
serve

to detect

nets,

and activate

positioning
efficiency

CT-9R

Reference

The

CT-9R uses

frequency

accuracy

of the

the

circuit

and

rotational

Frequency

generator

capstan

MOTOR

speed

CIRCUIT

of the

variable
into

the rotor.

of.362.5

output

is

amp

rpm

is

approximately

amplified

section

also functions

consists

of a

to convert

one

eomplete

This voltage

the speed

from

the reference

into

it

is used

to control

and reduce

type

90" apart.

positioning

the various

coils

(PA2012),

torque.
Generator

a

crystal

oscillator

increasing

motor.

capstan

output

reactance

of

frequency

This

motor is

the full

unit con-

to 72\Hz.Voltage
by

approximately

of PA200Z.

to

shape the

sample-and-hold

the

frequency

cycle

into

is

control

pin

11

voltage

pin

applied

7 and

to

signal

(PA200?)

from
pin

the

current

fluctuations
with Hall

The Hall

of

the rotor

via

providing

elements
elements

the composite

maximum

Circuit

as a reference

the rotational

B0mV

This

wave-

F-V

out-

an

pin

in

the

pin

re-

6

in

the

mag-

is

The

reference

by

the crystal
divider
from

confuol
by
reference

pin

Ll2

IC

in

15. This

IC

PA2007.

produce

to

frequency.

1.12 REEL

The

reel

the

capstan
apart.
tioning

various
signal
torque

contuol
PA2009.
in Fig.

Hall

of the

coils via

composite

and ma:rimum

The

reel

signal

The

1-36)
operational
speed

of

the motor.

The

signal

(MR)

Hall
square-wave
PA2010
counter

for

signal.

frequency (7.4283MH2)

oscillator

PD1003

signal

MOTOR

motor

motor;4-phase,
elements

rotor

is

and

output

is input

There,

tlrre

725.4L992H2

CIRCUIT

uses

the same

are used

magnets

divided

it

is once

electrically

the PA2010 position

circuit

to

efficiency.

motor

modes

element

pulse

use

is controlled

applied

various

are

to

signal combinations (shown

used

to activate

and

control

output from

is

waveform-shaped

and

taken

as the

(CT-9R

tape end

only)

pins

the right

LlStZO

as

14b0.8898H2

pin

into

again

phase

drive method

phased

to detect

and

activate

provide

by

the

15

and

the

the

direction

reel

from

pin

sensor

produced

by the

8 of the

divided
control

90"

posi-

the

the

detection

rotational

PMg001

L4 on

different

and

motor

into

1g

of

and

tape

as

a

MODE

STOP L

F.PLAY

R.PLAY

FF L

REW

REW.FF

FF.REW

ML; PIN

(PA2OOg}

INPUT

15 MR; PIN

L

M

H

M

H

Fig.

1-36 Reel

L

M

L

H

L

H

M

motor

REEL

14

Both

Right

Left

Right

Left

Right

Left

operational

MOTOR

reel

reel motor

reel motor

reel motor fixed

reel motor Fixed

reel motor

reel motor

OPERATIONAL MODES

motors

stopped

constant

constant

max

max

modes

current

current

speed

speed

drive

drive

drive

drive

Capstan

Motor

PrN

Block

(PA2007)

r3

Diagram

::F^=-,

(PAzooT

PrN 14

(v)

lll

;;U

PrN4

(v)

u.o|

PrNvr

,,]A

)

nnn

LJ

(PA2007)

Ii-\ t-t

\-J

(PA2OO?

tJ

)

A A

(PA2007)

PA2007

PrN

I

::fu

L

I

I
I

iK

it_ i--

T

m

\

LJ

n

.,"VVV

(PA2007)

PrN3

':'ts=-_______r______

L

I

PtN

1 {PA2012 )

PtN

(PA2012)

2

F**

(PA2012)

PtN

PrN

12

(PA2012)

14

PIN

Fig.

(PA2012)

PtN

12-1

il'[t

(PA2012)

14-',t

::IL,nL,

1-37

Capstan

n--

--

motor block

PtN

PrN

t

r

diagram

(PA2012)

9

I

(PA2012)

8

XTAL

=7.42A3

t

$Hz

;

Reel

Motor

Block Diagram

PA

2009

FF MOOE SIGNAL

PrN

13 ( PA2009

(v)

8.1
1

(PA2o|O)

PrN

8

(v)

WAVE

)

';1|J-tl-l

PrN

(v)

20

13.16

s.c

(

PAzOTO

t=76

PA20 |

)

Hz

O

12

(

PAzOOg

)

'li

f

;lj---l-l-l-

I

ML MOTOR

4. PHASE
DRIVE

rT

crRcu

PIN
PIN

(v)

3.5

o

-t

3i[

(v,

3.5

o

20-2
20_t9

33:i,

(

PA2OTO

)

(PAzo,o)

PrN4,14
(v)

r6.8

Fig.

1-38 Reel

(PAzOrO)

motor

block diagram

PrN

19 ( PA2OTO

2,

ol-

"t

PrN

(v)

ol

"t-r

| | |

(PA20rO)

r8

3,

|

)

t-t_i

r

Nfl

L_

23