Kyocera D-811 User manual

Service

Manual

D-811

STEREO

CASSETTE

TAPE

DECK

%

o

КЧПГЕПА

CONTENTS

Circuit

Description

3

Adjustment

Locations

7

Adjustments

8

Functional

Block

Diagram

13

Schematic

Diagrams

15

Wiring

Diagram

17

Exploded

View

18

Parts

List

-

Mechanicals

21

PC

Boards

Diagrams

23

Parts

List

-

Electricals

25

Typical

Specifications

27

This

symbol

is

intended

to

alert

CA

U

T

|

O

N

you

of

the

presence

of

uninsulat-

ed

dangerous

voltage

within

the

RISK

OF

ELECTRIC

SHOCK

unit's

enclosure

that

may

be

of

ОО

NOT

OPEN

sufficient

magnitude

to

constitute

a

risk

of

electric

shock.

CAUTION:

TO

REDUCE

THE

RISK

OF

ELECTRIC

SHOCK

DO

NOT

REMOVE

COVER

(OR

BACK)

NO

USER-SERVICEABLE

PARTS

INSIDE

REFER

SERVICING

TO

QUALIFIED

SERVICE

PERSONNEL

This

symbol

is

intended

to

alert

you

of

the

presence

of

important

operating

and

maintenance

instruction

in

the

literature

accompanying

the

unit.

Dolby

noise

reduction

and

HX

PRO

headroom

extension

system

manufactured

under

license

from

Dolby

Laboratories

Licensing

Corporation.

HX

PRO

originated

by

Bang

and

Olufsen.

Dolby,

the

double-D

symbol

and

HX

PRO

are

trademarks

of

Dolby

Laboratories

Licensing

Corporation.

CIRCUIT

DESCRIPTION

(a)

Power

On/Off

Reset

Timing

0806

D804

0901

(СРО)

69

|--Э0т5--|

|

+В

5V

|

1801

|

I7V

|

А

|

5V

B

|

=

|

C

|

5V

D

|

l|

|

е

|

5V

F

|

6б

тз

||

|

=

10ms

|

5V

G

POWER

ON

(1)

At

power

turning

on,

the

potential

at

U801

3/4

input

rises

in

the

time

constant

determined

by

R808

and

C811,

which

in

turn

set

its

output

to

"L"

at

the

threshold

point,

thus

finally

providing

the

reset

pulse

signal

for

power

turning

on.

(2

At

power

turning

off,

the

input

for

U801

4

turns

to

"L"

which

in

turn

reverses

its

output

to

"Н".

By

the

descent

of

the

U801

2/4

input

in

the

time

constant

by

R809,

a

constant

width

pulse

is

achieved

from

its

output

at

the

threshold

point,

which

is

reversed

by

U801

4/4

and

becomes

the

resetting

pulse

at

power

turning

off.

(b)

Reel

Motor

Drive

Circuit

Міосог

drive

voltage:

6V

at

FF

and

rewind;

3.1V

at

play.

(1)

FF:

Pressing

the

FF

key

changes

the

potential

at

430

of

U901

from

ОУ

to

5V

and

applies

it

to

#6

of

U902,

and

in

turn

turns

on

#10

to

energize

the

motor.

The

potential

at

#2

now

is

zero.

(2

Rewind:

Pressing

the

REWIND

key

changes

the

potential

at

#31

of

U901

from

ОУ

to

5V

and

applies

it

to

#5

of

U902,

and

in

turn

turns

on

#2

to

energize

the

motor.

The

potential

at

£10

is

then

zero.

(3)

Playing:

Pressing

the

PLAY

key

changes

the

potential

at

437

of

U901

from

ОУ

to

5V

and

in

turn

turns

on

Q905,

which

changes

the

potential

at

#10

of

U902

from

6V

to

3V.

(c)

Assist

Motor

Drive

Circuit

ASSIST

MOTOR

(V)

D907

8v

Motor

drive

voltage:

8V

Pressing

each

tape

transport

control

key

changes

the

potential

at

pins

429

and

#28

from

ОУ

to

5V

and

applies

it

to

pins

#5

and

#6

pf

U903,

which

in

turn

turns

on

pins

#2

and

#10

to

energize

the

motor.

(d)

Automatic

Stop

Circuit

+В

у

0901

LEFT

(СРО)

REEL

As

the

reflector,

located

coaxially

onto

the

supply

reel,

revolves,

the

light

from

the

LED

frequently

switches

on

and

off

the

photo-transistor

and

causes

0901

apply

а

clock

signal

to

#23

of

U901.

When

the

reel

stops,

the

unit

selects

the

stop

mode.

(e)

Automatic

Program

Search

R927

BEGINNIN

you

TUNE

BLANK

R61!

RCH

AUDIO

INPUT

L

CH

10

SEC

STOP PLAY

CUE

/

PLAY

CUE

BLANK

5V

CUE

Ov

When

playing,

pressing

the

AUTO

SEARCH

key

fast-forwards

the

tape

to

the

beginning

of

the

and

stops.

After

searching

for

the

exact

beginning

of

the

program,

the

unit

resumes

to

replay

the

initial

10

seconds

selection

of

the

program.

(f)

Mechanism

Position

Detection

3-bit

data

for

mechanism

position

detection:

FF/Rewind

Stop

Pause/Cue

Play

ко

[, [,

Н

L

КІ

H

L

H

K2

H

L

HX

PRO

System

Simplified

Circuit

Diagram

(g)

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YOLVYOSLNI

ADJUSTMENT

LOCATIONS

<PC

Boards

Top

View>

RV6O2R

-

'

FLZOIR.

FL7O!L

zi)

PSRAO11COX

RV606L

10)

RV606R

RV603R

AW

Bn.

бек

іш

RV6OAL

T?OIL

TOUR

(WE

aveo.

05601

RYEOIR

Р55У/329С0Х

RVSOIR

(NORMAL)

RVSO2L

RVSOIL

(33

me

В...

(S

(3

ме

А)

(Стог)

(METAL)

(МЕТА)

RVSO3L

RVSO3R

ADJUSTMENTS

Equipment

Required

1

Audio

oscillator

2

Milli-voltmeter

3

Oscilloscope

4

Frequency

counter

5

Distortion

meter

6

Wow/flutter

meter

7

Head

demagnetizer

8

Test

tape:

For

test

Tape

Brand

and

No.

Contents

PLayback

Level

adj.

TEAC

MTT-150

400Hz,

Dolby(R)

Level

adjust.

Head

azimuth

TEAC

MTT-114

10kHz,

-10dB

Frequency

resp.

$-point

TEAC

МТТ-1175Р

63Hz/1kHz/14kHz,

~20dB

Frequency

resp.

18-point

TEAC

MTT-256

3180

-

120usec,

-20dB

Frequency

resp.

18-point

TEAC

MTT-356

3180

-

70изес,

-20dB

Wow/flutter

TEAC

MTT-111

3kHz,

-10dB

Tape

speed

(Same

as

above.)

Crosstalk

TEAC

MTT-121

1kHz,

-10dB

Separation

TEAC

MTT-141

1kHz,

-10dB

AUTO

SEARCH

check

===

400Hz,

-25dB

Others

TDK,

AC-212

Normal

use

TDK,

AC-512

Cr02

use

TDK,

AC-711

Metal

use

Precautions:

To

avoid

the

magnetization,

do

not

apply

DC

current

(even

from

circuit

tester)

to

the

heads.

To

ensure

an

accurate

alignment

and

not

damaging

test

tapes,

demagnetize

the

heads

before

adjustments

by

using

a

demagnetizer.

Clean

the

heads

before

adjustments.

"Unit"

describes

the

model

D-811.

Observe

the

proper

tape

selection

in

accordance

with

the

test

tape

used.

Preset

the

controls

as

follows:

MPX

Filter

-

off,

DOLBY(R)

NR

-

off,

Input

-

Line,

Record

VOL

-

Maximum,

BALANCE

-

center,

REC

CAL

-

off,

OUTPUT

-

maximum,

and

BIAS

FINE

-

center.

1

Motor

drive

voltages

RED

LEAD

BLUE

LEAD

Use

circuit

tester.

The

voltage

across

the

motor

terminals

is:

3.0V+0.2V

in

play;

6.0V+0.2V

in

FF.

2

Dolby(R)

NR

Test

hookup:

LINE

OUTPUT

SG

400Hz

mV

OSCILLO

METER

SCOPE

Level

Meter

Alignment

(1)

Load

a

cassette

tape

and

set

the

unit

to

the

recording/pause

mode.

(2)

Adjust

the

level

of

signal

generator

output

(400Hz)

for

540mV

reading

on

voltmeter.

(3)

Adjust

the

potentiometers

below

so

that

the

OdB

[double-D

mark]

red

LED

lights

up

faintly

for

each

channel.

Left

channel;

RV606L

[PSRAO11COX]

Right

channel;

RV606R

Record

Calibration

Level

Adjustment

1

Use

the

same

test

hookup

and

set

the

REC

CAL

to

on.

2

Adjust

the

potentiometers

below

for

590mV

reading

on

voltmeter.

(The

oscillating

frequency

shall

be

400Hz+50Hz.)

Left

channel;

RV602L

[PSRA011COX]

Right

channel;

RV602R

Dolby(R)

NR

Encode

Boost

1

Connect

voltmeter

across

ТР1

апа

TP2.

2

Use

the

oscilator

output

frequency

of

5kHz

for

Dolby(R)

B-type

and

1kHz/700Hz/20kHz

for

Dolby(R)

C-type.

3

Set

the

Dolby(R)

NR

to

on.

4

Check

the

voltmeter

reading

on

the

following

table

(0dB-580mV):

B-type

(Test

f=5kHz):

B-type

C-type

(Test

fz700Hz)

(Test

f=1kHz)

Input

Voltmeter Voltmeter

Voltmeter

Level

Reading Reading Reading

OdB

(580ту)

===

==

-10dB

---

-20ав

---

==

-14.4dB+2dB

-25dB

-19.6dB*1.5dB

---

-30d8

---

-18.2dB*2dB

---

-40dB

-30.0dB*1.5dB

--- ---

-60ав

--- ===

-40.4dBt2dB

MPX

Filter

(19kHz)

(1)

Use

the

same

test

setup

as

above,

except

adjusting

the

signal

generator

output

to

19kHz.

(2)

Check

the

levels

at

MPX

filter

on

and

at

off.

The

difference

between

them

should

be

greater

than

30dB.

Playback

Frequency

Response

LINE

Preset

the

control

as

follows:

PSRAOIICOX

OUTPUT

control

-

maximum;

25.26

Dolby(R)

-

off;

and

TAPE

SELECTOR

-

NORMAL.

mV

OSCILLO

METER

SCOPE

PLayback

Output

Level

(1)

Load

test

tape

MTT-150

and

set

the

unit

to

play.

This

delivers

a

400Hz

audio

output

at

the

LINE

OUT

outputs.

(2)

Adjust

the

potentiometers

below

so

that

voltmeter

reads

580mV:

Left

channel;

RV601L

[PSRAOILICOX]

Right

channel;

RV60IR

Head

Azimuth

(1)

Load

test

tape

MTT-117SP

and

set

the

unit

to

play.

This

delivers

63Hz/1kHz/14kHz

audio

output

at

the

LINE

OUT

outputs.

(2)

Adjust

the

head

azimuth

adjustment

screw

(Ref

#10

in

the

"EXPLODED

VIEW;

Tape

Transport

Mechanism,

page

20)

so

that

the

level

at

14kHz

becomes

the

maximum.

|

*Optimum

|

adjust

|

р

L

|

R

L//

|

L

ie

AR

|

R

|

I

WHEN

THE

MAXIMUM

WHEN

THE

LEVELS

WHEN

THE

MAXIMUM

OF

TWO

CHANNELS

!S

OF

TWO

CHANNELS

TWO

CHANNELS

IS

ACHEIVED

ACHIEVED

IN

DIFFERENT

DIFFER

IN

DIFFERENT

SCREW

POSITION

SCREW

POSITION

AND

THE

LEVELS

DIFFER

Bias

Stepup

Transformer

(1)

Using

the

same

setup

as

above,

connect

(milli-)

voltmeter

in

the

place

of

frequency

counter.

(2)

Set

the

TAPE

SELECTOR

to

METAL

and

set

RVS03L

and

RVSO3R

on

PSSW329C0X

to

fully

counterclockwise.

(3)

Set the

FINE

BIAS

to

center

and

adjust

T701L

and

T701R

for

maximum

voltmeter

reading.

Recording

Circuit

Bias

Frequency

Check

Set

the

unit

to

recording/pause

mode.

Connect

frequency

counter

to

TP3,

4

and

to

ground.

Use

a

10:1

probe.

The

counter

should

read:

105kHz+3kHz

Record/Playback

Output

Preset

the

controls

as

follows:

TAPE

SELECTOR

-

METAL;

Dolby(R)

NR

-

off;

REC

control

-

maximum;

FINE

BIAS

control

-

center;

OUTPUT

control

-

maximum;

MPX

Filter

-

off;

and

INPUT

-

LINE.

11

12

(1)

Use

the

same

setup

as

above,

except

using

ІКН2

signal

genrator

frequency

and

setting

the

TAPE

SELECTOR

to

METAL.

Load

the

unit

with

test

tape

AC-711.

(2

Preset

RV605L

and

RV605R

([RECORD/CALIBRATION

LEVEL])

as

follows:

RECORD

CALIBLATION

LEVEL

L

R

(3)

Preset

the

potentiometer

оп

PSSW329COX

board

as

follows:

RVSO3R

RVSO2L

RVSO2R

RVSOIL

(4)

Adjust

the

signal

generator

output

level

to

-28dB,

where

OdB-580mV.

(5)

Record

and

playback

the

kHz

signal.

Adjust

the

potentiometers

below

until

-28

dB

output

level

is

obtained:

Left

channel;

RV605L,

Right

channel;

RV605R.

Record/Playback

Frequency

Response

(1)

Use

the

same

setup

as

above,

except

using

20kHz

frequency.

Load

the

unit

with

metal

test

tape

AC-711.

Record

and

playback

it.

Adjust

the

potentiometer

below

so

that

-28dB

output

level

is

obtained.

Left

channel;

RVSO3L

[PSSW329COX]

Right

channel;

RVSO3R.

(2)

Recheck

the

"Record/Playback

Output",

using

step

(5).

As

step

(1)

above

affects

the

record/playback

output

response.

(3)

Set

the

TAPE

SELECTOR

to

CrO2

and

load

test

tape

AC-512

(Сг02).

Use

the

same

setup

as

above,

except

using

frequencies

ІКН2

and

20kHz.

Adjust

the

potentiometers

below

until

-28dB

output

level

is

obtained:

Left

channel;

1kHz;

RV603L

[PSRAO11COX]

Right

channel;

IkHz;

RV603R

Left

channel;

20kHz;

RVSO2L

[PSSW329COX]

Right

channel;

20kHz;

RVSO2R

(4)

Set

the

TAPE

SELECTOR

to

NORMAL

and

load

test

tape

AC-212

(normal).

Use

the

same

setup

as

above,

using

ІКН2

and

20kHz.

Record

and

playback

it.

Adjust

the

potentiometers

below

until

-28dB

output

is

obtained:

Left

channel;

1kHz;

RV604L

[PSRAO11COX]

Right

channel;

IkHz;

RV604R

Left

channel;

20kHz;

RVSO1L

[PSSW329COX]

Right

channel;

20kHz;

RVSOIR

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SWITCH

TIMER

SO2

HEAD

PHON

nn

REC

OUTPUT

FINE

өт

s

оғ

HH

ON

[9

ON

по"

BALANCE

LEVEL

BIAS

Croz

n

NORMAL

METAL

MPX.

DOLBY

NR

FILTER

«All

PC

boards

top

view.»

17

EXPLODED

VIEW

АСВІ

ACI

36

35

34

37

AP9

33

APIO

47

0

2

<See

the

parts

list

іп

page

21.>

18

Tape

Transport

Mechanisms

EXPLODED

VIEW

--

19

page

22.>

<See

the

parts

list

in

Kyocera D-811 User manual

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