Tascam 32 Operation Manual

M

TEAC Production Products

2-Track Recorder /

Reproducer

( OPERATION/MAINTENANCE )

5700029101

MAINTENANCE

Note:

Parts reference numbers used description may not always correspond of

the

Model sections: and

REW System, 1-13 Amplifier Circuit Description.

32,

except

1-5

Reel Motor Drive Circuit, 1-9 F.F

Operation, 1-10 Electrical Brake

Ed

it Control Circu it and 1-16

for

in

the

circuit

to

those

following

NOTES

* All resistors are 1

otherwise. Resistor values are ohms, M=1,000,000 ohms).

* All capacitor values are

farads).

/4

watts, 5

%,

unless marked

in

ohms (K=1,000-

in

microfarads (p=pico-

* & Parts marked with this sign are safety critical

components. They must always with indentical Parts List and ensure exact replacement.

* 0 dB

*

is

referenced otherwise specified. PC

boards shown viewed from foil side.

components-

to

1 V

in

be

replaced

refer

to

the TEAC

this manual unless

Effective:

Januar1.

1982

1.

CIRCUIT

DESCRIPTION

Signal

flow

and functions this section. These should the

malfunctioning

1-1.

LOGIC

(a)

2

INPUT

(b)

2

INPUT

(c)

INVERTER

USED

NAND

NOR

circuit.

IN

THE TAPE DECK

GATE

of

the various control circuits

be

of help in analyzing any trouble which may occur

of

the tape deck

1-2. SYSTEM CONTROL IC 1-2-1.

Assignments

a b

C

H

L

H L

L H

L L

0 b

H H

H

L L L

b.

H

C

L H H H

•B

f,

FWO

FAST

2

3

PLAY

STOP f FWO

Operating ,nputs Contra! input Operating inputs

Fig. 1-1. Pin Assignments

are

explained in detail in

and

in correcting

and

Their Functions

Output Control input

REW

PLAY

PAUSE

REC

U519

M54410P

!TOP

VIEWI

4

5 6

MEMO

REW

PAUSE

REC

/\

AR

GNO

Note: H level = 3.4 V ~ 5 V

L level = 0

Operation inputs

Control inputs

Outputs power

Power

No.

1

2 3 5 6

1

4

9

10

11 12 13 14 15

8

16

V~

0.6 V

name PLAY STOP

F.FWD

REW

PAUSE

REC MEMO AR REC PAUSE PLAY REW FAST F.FWD GNO

+B

Reproduce Stop

signal Fast-forward Rewind

signal

Pause

signal

Record

signal

Memory

input

Record

inhibit

H-level

signal

H•level

signal

H-level

signal

H-level

signal

H-level

signal

H-level

signal

Ground

terminal.

Power

supply

start input

signal

input

terminal

signal

output output output output output output

terminal

signal

terminal

input

terminal.

input

terminal terminal terminal terminal terminal

terminal

input

terminal.

(resets

rewind

terminal

during during during during during during

(standard:

Function

mode

when

( L

level:

record

record/reproduce

pause

mode

reproduce

rewind

mode.

rewind

or

fast-forward

+5

V

+/-10%,

Signal

level:

Signal

level: Signallevel: Signal

level:

at L

level)

inhibited, H level:

or

record/pause

mode.

fast-forward

mode.

absolute

maximum:

L L L L L L

mode.

record

mode

+7.0

V)

e~

abled)

53

1-2-2. Block Diagram

FWD

IN

REW

IN

REC

IN

AR

3

5

4

7

9

6

IN

F.

STOP

MEMO

PAUSE

M54410P

10

F.

FWD OUT

FAST

OUT

REW OUT

REC

OUT

PAUSE

OUT

PUY

OUT

PLAY

IN

Fig.

1-2-3. Input Signalsand Resulting Modes

0

utp

ut

1

nput PLAY STOP

F.FWD REW

PAUSE

REC REC

Notes

signal

and

PLAY

and

PAUSE

1.

The

mode

2.

The

output

3.

Output R EC

4.

Output

signal

is

REW

set

at

retains

remains

the

at

REC

decaying

current

Las

L L L L L L L

H L

H

Las

mode

long

edge

as

PAUSE

L

H

of

the

until

input

AR

1-2.

input

an

input

is

MEMO

Block

Diagram

PLAY

H L

REW

L L L L L

H

L L

H L

l L L

signal

waveform.

signal

indicating a different

L.

is

L.

FAST

F.

L L L

H H L

L L L

mode

is

received.

FWD

L

H

L

+B

16

GND

8

Operating

PLAY

mode

STOP

mode

F.FWD

mode

REW

mode

PAUSE

mode REC/PLAY REC/PAUSE

riode

mode

mocle

54

1-2-4. Mode Transition

The

table

to

another

below

due

summarizes

to

an

input

transition

signal.

from

one

Gurrent

1

nput

signal STOP F.FWD REW PLAY PAUSE

REG

and

PLAY

REG

and

PAUSE

1-2-5. Operation with more than

When simultaneously, cated taneously

indicated normally

more

below.

Input

STOP

F.FWD

REW

REC

PAUSE

are

by

enabled.

signal

than

the

When

removed

the

A

Mode

one

last signal

lf REC and

STOP

F.FWD

-----

REW

PLAY

PAUSE

REG/PLAY

REC/PAUSE

input

deck

enters

input

signals

in

Any

combination

REW

REC

and/or PLAY R

EC

and/or PLAY PAUSE PLAY PAUSE PLAY

signal

sequence,

to

and

F.FWD

STOP

REW

-------

PLAY

REC/PLAY

-----

One

Input

is

received

the

mode

applied

the

be removed

PLAY

PAUSE

PLA

of

Y

or

F.FWD,

-----

~

REC/PLAY

----------

Signal

indi-

simul-

mode

is

REC

Input

signal

REW,

REW

STOP

F.FWD

PLAY

Note. A diagonal

B

REC,

PAUSE,

F.FWO

PAUSE

-----

REC/PLAY

REC/PAUSE

and or

record/pause

of

the

removed.

are

combined, will be which

and

PLAY

STOP

REW REW

line

PAUSE

sequence

the

PLAY

PAUSE

STOP

F.FWD

PLAY

REC/PLAY

-------

REC/PAUSE

indicates

enabled

that

are

combined,

mode

in which

lf F.FWD (REW)

the

input

signals

REG/PLAY

STOP

F.FWO

REW

REC/PAUSE

----------

~

REC/PAUSE

the

current

mode

the

will be

the

and

fast-forward (rewind) mode

regardless

of

are

removed.

Resulting

STOP

mode

STOP

mode

F.FWD

mode

STOP

mode

REW

mode

STOP

mode

R

EC/PAUSE REG/PLAY REG/PAUSE R

EC/PLA Y mode

REG/PAUSE

STOP

F.FWO

REW

REC/PLAY

-----

remains

unchanged.

-----

record/reproduce

enabled

input

the

REC

mode

regardless signals are or

PAUSE

sequence

in

1-2-6.

Input/Output

1

nput/output

Maximum Maximum Recommended H•level

L-level, Open-input H-level

L-level

55

levels

supply input

input

voltage

output

Levels

and

ltem

voltage

supply

voltage

voltage voltage

voltages

voltage

are

given below.

Minimum

-

4.5

V

2.0

V -

3.2

V -

2.9

V

1

Standard

-

5.0

V

-

- -

-

Maximum

5.5

V

-

0.8V

0.4

V

Absolute

7.0

5.5

maximum

V V

-

1-2-7.

Initial

Reset

Circuit

See Fig. 1-3.

The initial puts power tion during

the

is

reset deck turned

the

circuit generates a signal which

in

the

stop mode as soon as

on,

preventing incorrect opera-

time

the

DC

unstable.

When power is turned on,

U519 charges (C502 ~

C507).

the

no

lt

takes only

ise

suppression capacitors

charge C502 ~ C507 because city. When

fig.

the

5601

(PLAY)

$602

(PAUSE)

5603

(F.F)

S604(REW)

5605

(REC

5606(STOPI

1-3.

capacitors are fully charged,

R505

C502

l

R506

C503

R507

C504

R508

C505

1

R509

C506l

R510

C507

System Control

6

l-

l l

7

2

l

4

9

supply voltage

current

PLAY

PAUSE IN PAUSE

F.F

REW

REC

STOP

MEMORY

AR

lC

from

about

20

of

their low capa-

+B

PLAY

lN

IN

U519

F.F

REW

REC

FAST

8

IN

Input Circuit

the

msec

12

II

15

13

10

14

the

is IC to

the

PLAY, PAUSE,

F.F,

REW,

and REC input terminals become HIGH. However, it takes approximately 100 msec terminal capacity becorne flip-flop and Unless C507

terminal

the

to

rise

to

of

C507. Since STOP takes langer

HIGH

than

is

set

in

U519 when power

the

deck enters the stop mode.

is

fully charged

is

HIGH, U519 does

stop

mode

to

any

for

the

STOP input

HIGH

because of

the

other input terminals, a

isturned

and

the

STOP input

not

switch from

other

mode even if opera-

the

large

to

an

tion signals are input.

1-3.

POWER SHUT-OFF CIRCUIT

See Fig. 1-4.

A

photo

interlocked with

1. When

position, transistor sistor and turned

nal 6 of

capstan

2. When to

and

is

tape entire system stops when the tension arm

not

slackness or

interruptor type shut-off switch

the

right tension arm.

the

tension arm deviates from its normal

the

light beam falling on

is

interrupted and

output

0517.

voltage drops, turning

When

0516

off

and no power

is

cut

is

supplied

capstan motor assembly,

motor

0517

the

base

0518

connected

deck

set

is

deenergized.

goes off, base bias

of

0518

through R551 and R552

goes

on.Sincethecollector

to

the STOP mode switch,

is

set

to

the STOP mode. Thus,

in

its specified position due to tape

other

trouble.

the

photo

off

off, 081 3

to

and

current

of

photo

tran-

0516

is

also

termi-

the

flows

0518

the the

is

Fig.

1-4. Power Shut-Off Circuit

TO

CAPSTAN

,-----+-----OSTOP

MOTOR

lSTOP

ASS'Y

IN

U519

56

3.

When

the

tension arm

the

photo

and

outputs

and

0517

4.

When

Q516goeson,

is

grounded and

capstan

5.

When turned

motor.

0517

off,

mode switch and

circuit.

is

in its normal position,

transistor

a high ievel voltage

receives

conduct.

the

0813

supplies current

goes

on,

0518

disconnecting

0519

from the

base

0518

the light

to

make

bias

and

0519

from

the stop

speed

beam

0516

circuit

to

the are

sensing

the

activation force

but

minimizing heating

holding.

200msec

to

ensure positive action

of

the solenoid during

1-4. CAPSTAN

DRIVE

The tape deck circuits are shown

1)

Capstan solenoid

AND

CIRCUIT

uses

two

in

Fig. 1-5 (B).

BRAKE SOLENOID

solenoids; their drive

This solenoid operates in the PLAY mode activate the pinch roller. The solenoid off

in the PAUSE mode.

2)

Brake solenoid

In

the

PLAY,

solenoid operates

brakes. The solenoid

F.F, and

to

release

goes

REW

modes, this

the

reel

off

in the PAUSE,

STOP, F.F., and REWIND mode.

These solenoids operate

1 . When

PLAY

the

deck

button

is

as

described below:

is

in the

STOP

pressed, pin

mode

12ofU519goes

HIGH.

2.

When

12

goes current flows goes

on.

3.

When

0538

to

goes

capstan solenoid coil

HIGH,

the

on, the ground side

0537

base

of

0538

is

connected to the

goeson and

and

ground.

4.

When

12

of

U519

goes

on,followed

by

0541 the brake solenoid collector-emitter path

5.

When 0541 C531

goes

on, charging current flows

through raute (1) and approximately 200 goes

on and supplies the solenoids flows

Refer

6.

When

and

with

to

ensure activation

to

Fig. 1-5(A)

the

charge

0536

go

off,

+24 V. A

However, +12 V

and solenoid activation

HIGH,

sothat

are

grounded through the

of

0541. 0535

msec.

Then

capstan

large

of

current stops flowing, disconnecting +24 V supply.

is

supplied through D514

is

0539

R614,

C531

goes 0536

and brake

solenoid current

the solenoids.

maintained

minimal voltage.

7.

Thus, the solenoid voltage applied during activation

is

reduced

for

holding, maximizing

goes

motor

and

0538

of

goes

and

on

also

0535

with

T

Fig. 1-5 (A). Flashing & Steady State Voltage

to

the

to

for

57

I

PLAY

IN

U519

PLAY

,-------------------0~5-14-----+24V

,-------!lat-------

r

1

,..

_________

1 ®

1

Q)

D521

R614

R615

R7O5

Q535

R618

C531

+B

Q537

D516

Q538

R617

12

z

~

>-

et

a:

w

Q.

0

u.

0

w

0

::;;

>-

et

.J

Q.

>-

et

.J

w

>

w

.J

I

N

(l)

a:

D534

""

I

+

_

'

1

'

1

12V

1

CAPSTAN SOLENOID

T

t

R621

fig. 1-5 (B). Solenoid Drive Circuit

CD

CHARGING CURRENT

@ CAPSTAN

@ BRAKE

@ CAPSTAN

@

BRAKE

SOLENOID

FLASHING

SOLENOID

FRASH

ING

SOLENOID

STEADY STATE CURRENT

SOLENOID

STEADY STATE

CURRENT

58

1-5 REEL

Reproduce (Record) Operation

See

Fig.

1. Before 0547 a sides

lector-emitter the connected

corresponding

or

be

2. When voltage it current emitter-collector path R671 length Q552 supplies

motors until stopped required

3. At applied ductive, turning off turn, applied

4. Then of Q554 When supplied circuits (Q556, through circuits

MOTOR

1-6.

the

is

cut

off,

20

V line voltage

of

both

opposite

to

Q560

and

rotated.

the

P

LA

is

applied

conductive.

flows

for a short

is

determ

then

goes

+24 V to and

to

start

the

same time,

to

the

cuts

off

to

the

H level voltage to

Q555

to routes

to

initiatemotor

DRIVE CIRCUIT

PLAY

and

button

0548,

to

be applied to

reel motors through the col-

paths

of

0549

sides

of

the

circuit ground through its

drive circuit

0561

),

the

motors are unable

Y

button

to

0551

to

the

is

the

base

goes on and a charging

base

of

period

(1

ined by

on,

followed by

the

charging current

the

flashing current which

the

motors

the H level

base

of

0547

0548

the

20 V line voltage which was

motor circuit.

is

turn

it on, followed by

goes on, a base bias current

both

right and left motor drive

0557,

1 and 2 causing

driving.

has been pushed,

0549

go on causing

the

and D525. Since

motor

(0556

pushed,

of

0552

are

and

the H level

0550

making

from

0557,

Q551, C535 and

second) of which

the

value

of

C535.

0553

which

hat

sides

of

both

to

C535

is

provided.

voltage

is

making it con-

and

0549,

applied

to

which

the

0555.

and

0560,

the

Q561)

drive

hat

not

to

the

is is

also

in

base

is

5. Meanwhile, the H by C536 and 0558

and Q559 on. Since the right

is

connected to the

P

LA

Y start, it

than

that

of

more take-up torque, resulting

starting operation without

6. The

m ines

RE

E L size selector switch S611 deter-

the

amount

level

voltage

the

resultant short impulse turns

is

differentiated

ree·1

0559

collector

is

driven with a higher current

the

left, so it

is

tape

of

bias

current

at

able

to

in

a smoother

slack.

which

develop

be fed to both motor drive circu its by switching

R680 and R698 on and

off

to

enable proper

reel drive torque.

7. After stopped, a steady 12 V current the

the

transient

or

motors through D524.

flashing current has

is

supplied

motor

time

is

of

to

59

F'ROM (H

LEVEL

12

OF'

OUR!NG

R660

C:534l

U5l9

PL.AYl

R679

0548

R664

R665

R698 R680

0553

0524

2ov-'T7

----HL_l2V

24V 20V

12V

PLAY

t DRIVE

24V

VOLTAGE

t-

R687

C536

0530

0554

Fig.

1-6

Reel

Motor

Drive

Circuit

RI GHT REEL

_

_,_

__

LEFT

MOTOR

AOOIT!ONAL FRASHING

(

CURRENT

OUE

(l·~-

1 -

REEL

MOTOR

t-

60

1-6. TAPE

DIRECTION

COUNTER CIRCUIT

See Fig.

This which stationary This

1-7.

tape

deck

detect

and

function

whether

the

is photo-interruptors, and a

photo

transistor

transistor.

are

respectively and lower sides openings

shaft. mounted that

photo

disc

pair pulses higher speed.

and

The

in

both

output

transistors

rotates

of

LEDs

output

the

The

is

second

a similar

and

pulse

pulse photo-transistor U517 (an wave-shaped

amplifier/wave pulse

SENSING AND

CLOCK GENERATION

employs

direction

performed

of a rotating

coupled

pulses produced

are

the

represent

frequency, output

(PH502)

photo-sensing circuits

the

tape

is

running

each

The

pair

manner,

in which it

by

consisting

LED

mounted

disc

to

the

of

photo·couplers but

is

two

of

and

the

on

the

which

right reel

in

such a way

by

90°

out

of

phase

when

openings pass between each

photo

transistors. tape

speed,

the

obtained

is

applied

Thus,

higher

from

to

shaper} and

output

developed

at

or

running.

pairs

of

an LED

photo

upper

has

four

motor

the

two

the

and

the

tape

the

first

pin 2

of

the

pin 1

of

U517 then flip-flop U505).

photo

then

same

same f!ip-flop.

(high,

pulses applied

high level

is

ning when The turns

conductive

increment

counter

way,

tion,

DOWN

is

further

to

transistor

to

pin 12

way

low}

output

in

forward direction and a low level

the

high level signal produced

on

UP/DOWN when the

low level

input termina I

as

applied

11

of

The

is

of

U505

the

pulse applied

The

U505

pulse

applied

after

f lip-flop

to (the

output

to

relationship between

to

pins

11

and 12 and produces a

at

pin 9

when

tape

is

0532,

so

that

the

running

which

the

tape

input

tape

output

in

turn

instruction required

counter

terminal. In a similar

is

running

is

to

decrement

the

clock terminal

pin 6

wave-shaped

to

checks

the

reverse direction.

at

is

in

applied

base

of

0530,

by

the

second

of

U517,

in

11

of

the

phase

the

tWQ

input

tape

is

output

pin 9

of

U505

makes

issued

0533

to

reverse direc-

to

the

of

the the

run-

to

the

UP/

tape

counter.

FROM

PHOTO

COUPLER

tPH~02)

fROM

PHOTO

COVPLER

IPH5031

-,.5v

R584

.11.11.r~

R591

""UülJ7

6 5

U5!7

R588

R587

7

R594

R585

R586

R592

R593

Fig. 1-7. Tape Direction

R696

J711.

J"\I'JL

R595

R602

R603

R590

JV',

Sensing

vs,

~L.:;_1J7..::._S-_Rj,j.G,._O6 __

R598

L LEVEL

and

Tape Counter Clock Generation Circuit

TO

CLOCK

TAPE

COUNTER

R600

FOR FORWARD TAPE

FOR

REVESE

TAPE

INPUT

vss

RUNNlNG

RUNNI

Of

UNI

T

TO

UP/OOW!!

INPUT

TAPE

COUNTE~

NG

UNtT

CF

61

1-7.

COUNTER

See Fig. 1-7.

The wave-shaped pulse

1 of U517

turn

0528

pulse

output

lector

the

1-8.

See

electronic

MOTION

Fig. 1-8.

1.

The

U517

is

applied

wave-shaped pulse

to ferentiated of

0527 corresponding Thus,

C523

CLOCK

PULSE

output

is

also

applied

on

or off, along with Q529.

thus

to

tape

to

the

obtained

the

at

clock input terminal of

counter as a clock pulse.

SENSING CIRCUIT

output

represent

by

to

turn

is

the

tape

C525, then applied

it

on

and off

to

the

tape

speed at

repeatedly charged and dis-

developed at pin

base of Q528

the

0529

from pin 7 of

speed

to

the

at

a frequency

that

charged. However, C523 does not charge

when

0527

high speed

or

goes

when

on

the

and

tape

off

is

running

repeatedly

speed, and pin 6 of U516 (comparator) goes

is

time.

at

to

The

col-

dif-

base

at

high

HIGH

the

running

HIGH and

the

2. Since applied

and

U516 also low speed as lang as

3.

The

so

that

pin 7 of U516 goes HIGH. On

other hand, pin 7 goes

at

low speed. (Pin 7 may develop

LOW

output

tape

runs

at

a threshold speed.)

the

voltage developed

to

the

base

0507,

off

0521

goes on

at

low speed. Consequently, pin 1 of

outputs H at

two signals obtained

U516 are used

as

LOW

when tape

in

alternation when

at

pin 7 of U516

of

Q521 through R566

at

high

tape

speeds

0520

high speed

is

off.

at

pins 7

and L at and 1 of

motion control signals, as

described later.

4. The motion sensing circu it does not operate in

the

PLAY and PAUSE modes because pin

12

(PLAY OUT) and pin

U519

are

connected respectively, and when

the

PLA Y

or

0526

PAUSE

to

11

0508

is

forced

button

(PAUSE) of

and

0509,

to

go

on

is

pushed.

is

+B

T0

1 PLAY

TO

PIN !PAUSE OUT 1

H(F,F

ond

REW}

+5v

R696

R582

R581

0508

D509

C525

......

D510

R580

H:

fOR

(

L :

FOR

CONTROL SIGNAL

HIGHER

TAPE

LOWER

TAPE

RUNNING

CONTROl ~GMAl

H:

fOR

HiGHER

TAPE

)

(

L:

FOR

LOWER

Tt\l>E

RltlNiNG )

R\JNNING

.TU"\.

R594

12

OF

U5l9

OUTl

11

OF

U519

I

Fig. 1-8. Motion

Sensing

Circuit

62

1-9. F.F. AND

See

Fig.

1-9

1.

As

previously

6

of

U514

the F

.F.

2.

0547

goes tions, and line voltage

REW

OPERATION

mentioned,

develops

both

an

H level voltageduring

and REW operations.

off

du ring F .F.

0548,

to

0549

the

go on supplying 20 V

hat

sides

motors.

3.

When

the F .F.

button

is

pushed, the H level voltage developed through pin 3 applied

which in 0544 0556 the energizing

its

4.

At

own

the

to

goes

and

drive

same

the

turn,

an,

0557

circuit

time,

base

of

0543,

makes

5 V

is

applied

0544

thraugh raute 1

of

the right reel

(0556

the

base are also biased through raute 2 energizing

drive

5.

As

shown

resistance

of

raute motor current

right reel than motor tension

6.

When voltage it

on,

which the bias current

F .F. operation

now

R659, R658, R656 and same R657 and D523. This reel

than

of

circuit

in

(0560 the

of

2,

drive

to

the

motor

that

of

the

is

only

torque.

the

REW

is

applied to the

followed

applied

time is fed

motor

that

now

of

the right

the left

and

reel

0561).

schematicdiagram, the overa!I

bias raute 1

signifying

circuit

is

that

able

right motor. Consequently, the

rotates

left

with

reel

motor. The

driven to develop proper back

button

is

pushed, the H level

base

by

0546. is

applied above in the

is

reversed.

to

the

base

0522

to

the

base

being

rotates

reel

with

motor

pin 3 and pin

and

REW

opera-

of

both

reel

of

U514

turning

go

to

motor

and

0557).

of

0560

to

motor

is

lower than

the

to

supply more

it

on,

on. When

the

base

to

enable

through

and 0561

enable the

thraugh its

that

right

reel

higher torque

left

reel

of

0545

turning

Then the manner

The

bias

current

of

0556

thraugh

while

at

the

of

0560

thraugh

the

case,

the left

higher torque

in this

case.

is

of

is

1-10. ELECTRICAL BRAKE SYSTEM

See Fig. 1-9

The electrical braking system functions when a fast operation mode mode

and

continues

speed

draps

to motion The

REW

1.

case

to

When

REW

sensing

circuit develops an L level signal.

in which the mode

STOP

is

the

STOP

mode

of

LOW, then pin 12

make pins 11, 5

U514

go

HIGH.

HIGH, pin 6 and

0546

are turned

2. While the logic state at pin 6

to

HIGH

motion

by

sensing

operation, pin 8

U514)

goes

LOW

depressed. Then pin 3

3. Thus, the mode

changed braking tape

4.

When reduced the

outputs

(pin 1 6

of H and pin 3 3

and 6 of

set

the F

5.

When

cut,

the ground

from

is

applied

speed

rapidly.

tape

by

applying the electricai'hrake

reel

motors, the motion

an L level

of

U513)

goes

of

U514

to

L when the R

.F

mode).

pin 3

of

and

0541

side

apply mechanical braking

is

changed

to

function

a predetermined

described below.

button

is

operation, pin 13

of

U513

and

10

of

U513

of

When

U514

pin 4

goes

off.

the H level

output

circuit during

of

U513

(and

when the

of

U514

of

operation

REW

to F.F

to

the

reel

motors

speed

has

been

signal

to the

and

the

flip-flopoutput

L;

then, pin 8

U514

goes

are

set

to

L (pin 6

EW

mode

U514

goes

L,

and

0542

go

of

the brake sole~oid

to

L.

0541 off

the

to

any other

until

speed

is

changed

depressed

of

U519

goes

and

of

U514

LOW and

of

U513

from

REW

mode

thus,

pin 2 of

STOP

button

goes

f-1.

is

temporarily

and

electrical

10

considerably

sensing

reset

terminal

of

U513goes

Thus,

both

of

is

cha

base

to

disconnect

reel

rnotors.

the tape

and

the

from

in

the

goes

LOW

to

pin 4

of

goes

0545

is

set

the

of

reduce

to

circuit

(pin pins

U514

is

nged

to

bias

and

is

63

U512

+SV +12V

U519

REW

FROM

MOTION H

SENSING CIRCUIT L

(PIN 7 OF

"H"

R648

R649

R652

516)

LEVEL LEVEL

FOR FOR

FF REW

R650

FOR

HIGH SPEED

FOR

LOW

SPEED

R651

R655

+B

1

\0544

,

(

f -

1

R658

1 1

1

1 R659 1

1

T

+24V

R686

R683

D532 D533

R653

Fig. 1-9.

FF

and

REW Mode Operation Control Circuits

R694

C537

R696I

64

1-11.

See

lf

Fig.

ZERO

COUNTER

1-10,

RETURN

ZERO RETURN

switch S609

is

set

to

ON, the tape stops automatically when the electronic counter reading

mode

designed

of

operation.

to

reaches

zero during the

The electronic counter

produce one H

level

pulse when its

REW

reading reaches zero. The zero return operation

functions

1.

When

is

Thus,

pin 12 running at high circuit also applied While counter zero,

is which this U506. Since set U506 collecto r button, changed

2.

When set, goes of

3.

When REW system starts

not stop immediately

tiona l inertia

to the tape stops, then starts ward

as

follows:

the

REW mode

applied

of

to

the

11

of

U506

outputs

to

pin 5 of

in

the

is

decremented and, when

it

generates one H level pulse. This pulse

applied

in

HIGH

to

turn

pulse

the

to

H,

11

goes H to

is

connected in parallel to the F .F

is

base

of

U510, pin

are

set

speed,

an

U507

REW

base

of

makes

is

applied

12

of

U506

turn on

set,

an

H level voltage

0509

to

10

of

to

H. While the tape

the motion

H level signal, which

and

pin 5

mode, the electronic

0507

to

pin 6

of

to

U506

has

goes

L, then pin 8

0510.

the tape deck operation mode

from

REW

to

F .F mode electronically.

11

of

U506

goes

L, the

pin 3 of

L, then

U507

is

set

U507

pin 8 of

to

H.

goes

U507

H, pin 6

goes

tape deck operation mode

to

F.F, the electro-magnetic braking

to

function but the tape

because

and

the tape counter continues

be

decremented.

direction

When

the inertia

to

(the F.F mode

run in the for-

turn

it

on.

U510,

and

sensing

of

U509.

it

reaches

turn

it

on,

U506 HIGH;

pin 13

atready

of

been

of

As

0510

flip-flop

of

U507

Handpin

changes

12

from

does

of

high rota-

decreases

is

set

at this

time).

4.

When

the F .F mode applied then Now

to

the

pin 3 of

the

tape counter

U508 (pin

and, when the reading counter outputs one H

is

applied

of

U508

to

set U507 U507 ing

tion mode

to

go

pin 13

has

already

goes L and

0511 on

from F .F

L.

or

is

set,

base

13

of

Pin 8 of

of

U507

been

r,in 6

an H level

of

0508

12

of

is

being incremented reaches

level

pulse. This pulse

U508

to

U508 then

to

H.

set

to

of

U508

to

turn

U508)

zero, the

make pin

As

H, pin

goes

H, turn-

signal

it

goes

12

11

changing the tape deck opera-

to R EW.

is

on,

H.

11

H of of

is

is is

is

5.

On

the other hand, when pin

L the

flip-flop

set

and

of

the

6.

When

goes H again

Now

the counter

when

it and applied then

goes

of

U509

same the

pin 3

is

REW

and pin

reaches

to

L, pin 3

goes

consisting

of

U509

set

to

L.

mode

10

is

being decremented and,

zero, one pulse

pin 9

of

U510

L.

7. Meanwhile, when pin 3 started below), pin 6 on

0512,

which in turn

of

mode switch. Thus, the tape a gradually reaches

decreasing

zero.

speed

8. However, when the position in which is

to

be

that

at which the

can

be

stopped

directly

is

within

REW

stopped

11

of

two

U509 units

is

set

to H and

is

set, pin

of

U510

U510. Pin 8

goes

of

U511

is

U510

goes H to

closes

is

when the

3 or 4

mode

is

set, the tape

without

repeating the

U507

11

of

is

set

is

generated

of

H,

and

set

to L (as

the

stopped at

eo

the

seconds

REW/F.F./REW/STOP operation described

above. This operation When

the rewind mode

is

applied

is

applied

to

C542

the

decreasing voltage at pin 2

pin 1

of

U515 to H

the tape counter

period, its zero pulse U511, setting pin 3 6

of

U510

to

go Thus, the the generated

mode

STOP

is

set.

REW

mode

within

is

conducted

is

set,

and

a differentiated impulse

base

of

0561 of

for

3 ~ 4 seconds.

reaches

of

HIGH

mode

if

the counter zero pulse

3 ~ 4

zero

is

applied

U511

and

is

changed

seconds

an

H level

to

U515

to p in 2 of

to

L,

to

turn

after

as

turn

and

wittlin

causing pin

directly

follows:

0512

the

goes

pin 6

U510

to

H.

U510

pin 8

turn

STOP

unter

tape

of

signal it

on,

setting

When

this

on.

to

REW

is

65

ZD

(FROM

COUNTER

ZERO RETURN

SW

S609

R525

H(F.Fl

R529

FR0M U519

PIN15

H(REW)

R532

FR0M U519

PIN13

ELECTR0NICS\

+5V

C516r

C514l

C515l

R709

R707

H:HIGH

L:

L0W SPEED

FR0M

(

PIN I 0F

Fig.

1-10. Counter Zero Return Control Circuit

C543r

SPEED

SENSING

CIRCUIT)

66

1-12. PUNCH

See Fig. 1-11

1. The PUNCH consists tary

switch. When the punch pushed once, 0901 and

U506 generates

2. In

the

pin 12

flip-flop

pulse

is

in/out

output

U502 H through goes H so collector

REC

changed

3.

At

the

changes

of

U503 . Then, pin 8

sets

pin 13

U502

of

U505

IN/OUT

of

0901,

PLAY

of

U502

is

H.

applied switch (pin

5)

goes L because

that

is

connected

mode switches, the operation mode

from

same

its logic state

of

goes

H,

from H to

CONTROL CIRCUIT

IN/OUT

mode, pin 1/2

Under this condition, a H

is

changes

12

0505

PLAY

time, another flip-flop in U503

U503

changing the logic state at pin 2

switching pulse circuit

0902,

is

to

pushed, then the

of

U506

goes

off,

an H level

H,

so

pin 2

pin 3

of

from L

pin 5

U519,

goes

on. Since the

to

both the PLA Y

to

REC/PLAY.

and

of

to

H.

in/out

pulse.

of

U505

of

and

outputs L at pin 6

U503

Further, pin

and

0902

U502

of

if

to

H, pin 6

U502

pin 8

goes

a momen-

switch

goes

on

is

Land

the U505

level

the punch

flip-flop

of

is

set

to

of

U502

0505

and

H and 1/2

of

L.

is

4.

When

the PUNCH

once more, a positive pulse

3

of

U505 which

because

L.

U504 13 of Thus, the H level applied to the operating the AR circuit recording.

5. Three diodes (0537-0539) connected CLEAR terminal avoid erroneous PUNCH IN operation which would be switching (F.F,

of

pin 2

Then pin 1/2

(and

pin 12

of

U503

has

U503

goes

caused

IN/OUT

changes

of

U505

of

U504

of

U503)

already

L and pin 6

pulse

base

of

during operation mode

REW

& STOP).

output

is goes

been

obtained

0506,

of

U505

switch

is

applied

at this time

Land

goes

set

of

U504

turning

U519

are

is

pushed

from

pin 3 H. Since pin to

H, pin

goes

is

it

on and

to

inserted

to

H to L

set

to of

11 H.

finally

inhibit

to

the

to

67

12

PLAY

(>-"

=----..--------------------~

PUNCH IN/OUT

SWITCH

AR

R902

R901

h

l

U519

REG

+5V

R516

STOP

F.

U506 REW

3

(H)

_n_

1

2

U502

SW,

F.

SW.

Fig. 1·11.

D537

0538

0539

U504

R519

Punch

R520

3

4

In/Out

Control Circuit

U503

PLAY

(5601)

PLAY

(S605)

TO

AR OF U519

(1)

00

1-13.

EDIT

See

control section

1.

When go an, an,

ly

power supply DC actuate also the

2.

At

the

CONTROL CIRCUIT

of

the inserted circuit diagrams.

the

EDIT

switch

followed

the

Q813

by

base

is

power

goes

the

to

the capstan

motor.

on

to

STOP mode.

same

time, when Q509

is

Q512. With Q512 turned

bias

circuit on

closed and Q813 supplies

At

the

turn

off

and Q558 are grounded through

0529

and through the collector-emitter path

of

Q509,

3. Ouring the or

and R EW IN circuits switch being

to

stop the take-up

EDIT

REW mode

set

mode

is

available

on.

of

are

on, Q509 and Q510

PCB

assemb-

motor

same

Q514

reel

operation,

because

opened

time,

goes

0528,

motor.

the F.F IN

by

circuit

to

Q511

to

release

an, Q556,

0527,

no

F.F

the

ED

IT

+24V

1-14.

REC

AND PLAY MUTE SIGNALS

See

Fig. 1-12.

1.

REC

signal

When the

U519 applied When Q524 and Q525 connected to

actuate amplifier circuits associated

REC

outputs

to

the

goes

also

to

button

goes

R579

recording.

2. Play Mute Signal When of applied grounding the

the

PLA

Y button

U519 outputs

to

the

PLAY

low level state

amplifier circuit

switch connected in parallel the

same

function

when

it

is

closed.

5607

CUE

---+-2-4V.J~

is

depressed, pin an H level base

of

an, Q525

signal, which

Q524

to

base

on. The +24 V line

for

use

as

a contro I voltage

is

depressed, pin

an H level

base

of

signal, which

Q534

to

MUTE terminal. This

is

also

used

to control the

(as

described later). The

with

as

the

PLAY

10

of

is

turn

it

on.

current flows

is

then with

12

is

turn

it

on,

CUE

Q534

serves

MUTE

signal

U519

REC

10

R695

C528

l

R576

R722

Fig. 1-12.

R608

.__.,__

I

R578

Rec

& Play Mute Circuit

R609

__

C529

+24V

REC

R827

.,___..._~--

SIG

R828

PLAY MUTE

69

1·15.

DISPLAY

See

Fig.

1-13.

A.RECORD

1. The

comparator

and

7 const itutes a square

and

outputs a pulse

REC

button to H and of

U511.

pin 5

of

is

on, pin 1

2.

lf

one

mitches

applied to R511 causing

H.

pin 11

Then,

L, setting p

0501 on.

3.

Next, assume that none of the record

LED

is

the

pulse

The

0501.

of

or

more

are

mitched

pin 3 of

in 6 of

Thus,

CIRCUIT

of

U515

signal

at pin 7.

depressed, pin 9

output

pulse signal

Meanwhile,

U501

is

as

is

set

to H.

of

the record function

on, a L

as

the

REC

of

U511 (pin 2

U501 (pin 4

U501 to H

the

REC

LED (D601) lights.

with

pins 5, 6,

wave

oscillator

When

of

U511

obtained at pin 8

then fed

the

REC

level

signal

MODE signal,

of

U501)

of

U501)

and

turning

+5V

the

is

set

to

gate

button

to

go

goes

is

function switches

then applied

R511

so

that

goes

L.

Since pin 1

3

of

U501 (pin 4

output

gate (pin 6

are

to

pins 12/13

11

of of

on;

of

U511 (pin 2

of

U501

U501)

U501) opens. Then, the pulse signal applied to pin 5 output and indicate mode

from pin 6

oft

and that

but

that

of

U501, turning

making the

the tape deck

no recording channel is design-

ated.

B.

PAUSE LED

When on, pins 12 an L level Then, pin 8 and

the

REC

and

the

PAUSE

and

13

of

U501

signal

is

output

of

U501

goes

lighting PAUSE LED D602.

an

H level

of

U511 through

is

set

goes H and

of

REC

LED flash to

is

in

buttons

are

set

at pin

11

H, turning

signal

of

501)

to

H, pin

the

U501

0501

on

the R EC

are

to

Hand

of

U501.

on

0502

is

L (REC

MODE)

PAUSE

U519

PLAY

REC

12

II

IQ

Fig.

R556

R557

1-13.

C552

r

Display

R716

R559

Circuit

+24V

REC

Q50I

D602~

+24'/

R558

70

1-16.

AMPLI

This

description

the

exception are assembled TER OSC

LED

indicators.

1-16-1.

See Fig. 1-14.

K102

is a muting

line

from power switch is turned supply starts,

F IER CIRCUIT DESCRIPTION

PCB,

Power

covers only

of

several switching circuits which

on

the

IN/OUT SELECT PCB, and

Muting Circuit

one

FUNCTION

relaywhich protects

impulse

+6

noise occurring when

an

or

off. When power

V

{VU

meter lamp power) rises

channel, with

PCB,

the

output

rapidly, charging C802 through R801. When voltage across goes

on

OUTPUT

C802

and

K 102 operates

terminal

reaches

to the

about

to

output

1.2 V,

connect

circuit

©

OUTPUT

~1-6

AMPL.

___

11

.,.._-crJ

MAS-

the

0801

the

of

the

OUTPUT

OUTPUT amplifier. lt takes K 102

to

go

an

after power supply starts. The

power lines

of

the

about

3 seconds for

deck's amplifier reach a steady state during this time. Thus, output When power to quickly discharges through lamp; the output

(Q801)

line

is

protected from transient noise.

is

the

turned off,

VU

meter lamp falls rapidly, and C802

0801

and K102 go off immediately before

the

0805

+6 V applied

and

amplifier power line voltage falls. Thus,

line

is

also protected from transient noise.

POWER

Ki02

6V

0

15V

0

OFF

ON

Appro

x.

3sec

POWER OFF

'""7_

~12V

, ,

~

Approx.

the

IOOmsec

audio

meter

the

®

@

©

+6V

®

UIOI

METER

Cl08l

LAMP

""

l

1

L_

Fig.

R802

1-14.

1C802

Power

Muting Circuit

71

Tascam 32 Operation Manual

Specifications and Main Features

Frequently Asked Questions

User Manual