Akai GX-266D Manual de usuario

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SERVICE

MANUAL

PARTS

LIST

worn

GX-266D

I

G4|

AKAI

STEREO

TAPE

DECK

move.

GX-266D

SECTION

1

SERVICE

MANUAL

SECTION

2

PARTS

LIST

ey

Cr

I.

TECHNICAL

DATA

TRACK

SYSTEM

4

track

2

channel

stereo/monaural

system

REEL

CAPACITY

Up

to

7”

reel

TAPE

SPEED

____7-1/2

and

3-3/4

ips.

(40.5%)

WOW

&

FLUTTER

Less

than

0.06%

at

7-1/2

ips.

Less

than

0.09%

at

3-3/4

ips.

FREQUENCY

RESPONSE

30

to

25,000

Hz

+3

dB

at

7-1/2

ips.

using

LN

tape

30

to

19,000

Hz

+3

dB

at

3-3/4

ips.

using

LN

tape

;

30

to

26,000

Hz

+3

dB

at

7-1/2

ips.

using

WR

tape

30

to

20,000

Hz

+3

dB

at

3-3/4

ips.

using

WR

tape

DISTORTION

(1,000

Hz

“0”

VU)

Less

than

0.5%

at

7-1/2

ips.

Less

than

1.0%

at

3-3/4

ips.

SIGNAL

TO

NOISE

RATIO

Better

than

56

dB

(Measured

via

tape

with

peak

recording

level

of

+6

VU)

ERASE

RATIO

Better

than

70

dB

BIAS

FREQUENCY

100

kHz

HEADS

|

(6):

Two

GX

Playback

Heads,

Two

GX

Recording

heads,

Two

Erase

heads

MOTORS

|

(3):

One

AC

Servo

Capstan

Motor

Two

Eddy

Current

Reel

Motor

F.F

&

Rewind

Time

90

sec.

using

1,200

ft.

tape

7

OUTPUT

JACKS

Line

(2):

0-0.775V

(MAX

0

VU)

required

load

impedance:

more

than

20

k

ohms

Phone

(1):

0—100

mV/8

ohms

(MAX

0

VU)

INPUT

JACKS

Microphone

(2):

0.25

mV/2.4

k

ohms

required

microphone

impedance:

600

ohms

_

___|__Line

(2):

70

mV/100

k

ohms

SEMICONDUCTORS

Transistors:

61,

Diodes:

92

DIMENSIONS

404

(W)

x

470

(H)

x

250

(D)mm,

(15.9

x

18.5

x

9.8”)

cr

-

sells

ae

250(D)mim

With

Wood

Side

Plate

WEIGHT

|

18.3

kg

(40.4

Ibs.)

:__20.6

kg

(45.5

Ibs.)

:

With

Wood

Side

Plate

"POWER

REQUIREMENTS

___110/120/220/240V,

50/60

Hz

Switchable

*

For

improvement

purposes,

specification

and

design

are

change

without

notice.

i.

DISMANTLING

OF

UNIT

In

case

of

trouble,

etc.

necessitating

disassembly,

please

disassemble

in

the

order

shown

in

photographs.

Reassemble

in

reverse

order.

HEAD

COVER:

PINCH

ROLLER

CAP

Eo

oo

F

be

SCREWS

CONTROL

KNOB

&

SWITCH

KNOB

UPPER

PLATE

c

SIDE

4

TENSION

PLATE

ARM

e

PINCH

ROLLER

SCREWS

MACHA

PANEL

BOTTOM

PLATE

SCREWS

AMP

PANEL

OPERATION

PANEL

SCREWS

REAR

PLATE

SCREWS

li.

CONTROLS

Q@O@@®

@®©

QCOOCW!®

1.

INDEX

COUNTER

AND

RESET

BUTTON

.

PINCH

ROLLER

HEAD

COVER

.

SUPPLY

REEL

TABLE

REEL

RETAINER

TAPE

GUIDE

(SENSING

POLE:

FORWARD-REVERSE)

-

TENSION

ARM

8.

PAUSE

LEVER

(PAUSE)/REC

MUTE

OFF

.

REVERSE

SELECTOR

(REV

SELECTOR)

.

POWER

SWITCH

(POWER)

.

RECORDING

MUTE

SWITCH/TIMING

LAMP

.

VU

METER

(FOR

LEFT

CHANNEL)

.

VU

METER

(FOR

RIGHT

CHANNEL)

MONITOR

SWITCH

(MONITOR)

.

HEADPHONE

JACK

(PHONES)

MONITOR

TMeR

BTART

PAL

rare

Ss

YAPa

|

Tape

—AEC-—

armas

tend}

SPHEO

SELECTOR

vary

Alcor

ur

ed

Low

Pa

16,

17,

18.

19.

20.

.

TENSION

ARM

(SENSING

POLE:

REVERSE>FORWARD)

.

OPERATION

BUTTONS

.

MEMORY

MARKER

(FOR

LINE-IN)

.

MEMORY

MARKER

(FOR

MIC-IN)

.

MICROPHONE

INPUT

CONTROLS

(REC

LEVEL-MiC

.

LINE

INPUT

CONTROLS

(REC

LEVEL-LINE)

-

MICROPHONE

JACK

(MIC)

.

RECORDING

LEVER

(REC)

.

TAPE

SELECTOR

.

TAPE

SPEED

SELECTOR

S8SBNSREESKS

COQ

OOO

@O

OO

@

LINE

OUTPUT/HEADPHONE

OUTPUT

CONTROLS

(LINE

OUT-PHONES)

TIMER

START

SWITCH

(TIMER

START)

REEL

RETAINER

TAKE-UP

REEL

TABLE

TAPE

GUIDE

IV.

=

[=]

PON

AHRAWN

om

.

PINCH

ROLLER

MICRO

SWITCH

SW-905

PINCH

ROLLER

PLUNGER

SOLENOID

SL-3

PAUSE

MICRO

SWITCH

SW-903

&

SW-907

TENSION

MICRO

SWITCH

SW-904

MUTE

SWITCH

P.C

BOARD

NE-2228

BRAKE

PLUNGER

SOLENOID

SL-901

BRAKE

MICRO

SWITCH

SW-906

.

REEL

MOTRO

MICRO

SWITCH

SW-908

.

HEAD

BLOCK

.

RIGHT

REEL

MOTOR

24X0-MR

11.

12.

13.

14,

15.

16.

17.

18.

19.

PRINCIPAL

PARTS

LOCATION

Rear

View

OPERATION

P.C

BOARD

NE-2239

MIC

AMP

P.C

BOARD

NE-5223

AMP

P.C

BOARD

NE-5222

POWER

TRANSFORMER

NET-11

LEFT

REEL

MOTOR

24X0-MR

VOLTAGE

SELECTOR

SYSTEM

CONTROL

P.C

BOARD

NE-1213

CAPSTAN

MOTOR

SCM2-24KJ

REV

PLUNGER

SOLENOID

SL-902

V.

MECHANISM

PINCH

ROLLER

MICRO

SWiTCH

SW905

QUICK

PLATE

Fig.

1

I.

PINCH

ROLLER

POSITION

ADJUSTMENT

AT

STOP

MODE

(Refer

to

Fig.

1)

1)

Remove

head

block.

2)

Adjust

Stopper

so

that

the

clearance

between

Pinch

Roller

and

Capstan

Shaft

is

10mm.

Fig.

2

2.

POSITION

ADJUSTMENT

OF

PINCH

ROL-

LER

SOLENOID

SL-3

(Refer

to

Fig.

2)

1)

Remove

head

block.

2)

Insert

a

4.2

mm

gauge

(a

U

type

washer

etc.)

between

the

P

Plunger

Lever

and

P

Joint

(Refer

to

Fig.

3).

3)

Set

the

deck

to

playback

mode

and

fix

Pinch

Roller

Solenoid

at

position

at

which

the

pinch

Roller

begins

to

rotate.

3.

PINCH

ROLLER

PRESSURE

ADJUSTMENT

(Refer

to

Fig.

3)

Adjust

Pinch

Roller

Pressure

Adjustment

Nut

so

that

pinch

roller

pressure

is

1.2

kg.

4,

POSITION

ADJUSTMENT

OF

QUICK

PLATE

(Refer

to

Fig.

1)

Adjust

Quick

Plate

position

so

that

at

stop

mode,

the

Pinch

Roller

Microswitch

operates

properly,

and

the

Quick

Plate

does

not

strongly

hit

against

the

body

of

the

microswitch.

ADJUSTMENT

PINCH

ROLLER

PRESSURE

ADJUSTMENT

NUT

—

1.3

to

1.4

kg

P

PLUNGER

LEVER

5.

POSITION

ADJUSTMENT

OF

BRAKE

SOLENOID

SL-1

(Refer

to

Fig.

4)

Set

the

deck

to

playback

mode,

and

fix

Brake

Solenoid

at

position

at

which

the

left

and

right

brake

levers

display

180°

angle

relativity.

6.

POSITION

ADJUSTMENT

OF

BRAKE

MICROSWITCH

SW-906

(Refer

to

Fig.

4)

Set

the

deck

to

playback

mode,

and

adjust

Brake

Solenoid

Microswitch

position

so

that

the

micro-

switch

operates

properly.

7.

BRAKE

TENSION

ADJUSTMENT

(Refer

to

Fig.

4)

Adjust

Spring

Stopper

position

so

that

the

brake

tension

is

350

to

500g.

BRAKE

SOLENID

SL-1

REEL

MOTOR

BRAKE

MICROSWI'cH

Soe

sooe

MICROSWITCH

Sw908

SwoE

i

PAUSE

MICROSWITCH

SW-903,

SW-307

PAUSE

SUDE

0.3405

mm

8.

PAUSE

ADJUSTMENT

(Refer

to

Fig.

5)

1)

At

playback

mode,

lock

Pause

Lever.

2)

Adjust

Pause

Lock

Plate

position

to

obtain

a

0.3

to

0.5

mm

clearance

between

Pinch

Roller

and

Cap-

stan.

3)

When

making

this

adjustment,

be

careful

that

the

clearance

between

Pinch

Roller

and

Capstan

does

not

exceed

0.5

mm.

4)

Confirm

that

the

Quick

Tension

Microswitch

is

pushed

when

the

Pause

Lever

is

depressed

and

if

not,

adjust

with

QT

Lever

B.

pHs

SUPPORT

ANGLE

t

O.tmm

CAPSTAN

eal

|

|

¥.

<<

ae

{OI}

2

ADJUSTMENT

WASHER

CAPSTAN

SHAFT:

|

Fig.

6

TANSION

MICRO

SWITCH

SW-904

Fig.

7

FIXATION

SCREW

PIPE

EL

LO

LIL

ORCL

LILEL

ED

(iF

9.

CAPSTAN

SHAFT

LOOSE

PLAY

ADJUST-

MENT

(Refer

to

Fig.

6)

Adjust

to

obtain

a

clearance

of

about

0.1

mm

between

the

capstan

shaft

and

thrust

support

angle.

10.

OPERATING

POSITION

ADJUSTMENT

OF

TENSION

MICROSWITCH

SW-904

(Refer

to

Fig.

7)

Adjust

Tension

Microswitch

position

so

that

when

the

Tension

Arm

drops,

the

microswitch

operates

perfectly

to

effect

stop

mode.

TAPE

GUIDE

te,

TAPE

TENSION

ARM

ADJUSTMENT

WASHER

*

LOWER

THE

GUIDE

DOWN

A

LITTLE

ADJUSTMENT

WASHER

XLFT

THE

GUIDE

UPA

LITTLE

Fig.

8

11.

TAPE

GUIDE

HEIGHT

ADJUSTMENT

(Refer

to

Fig.

8)

1)

Adjust

Tape

Guide

height

so

that

the

tape

does

not

curl

between

tape

guides

on

Head

Base.

2)

In

case

the

tape

guide

is

low,

adjust

by

inserting

a

U

Type

Washer

on

the

right

side

in

Fig.

8,

and

in

case

it

is

high,

adjust

by

inserting

a

washer

on

the

left

side.

12.

REEL

TABLE

HEIGHT

ADJUSTMENT

(Refer

to

Fig.

9)

1)

Load

a

tape

and

sét

the

deck

to

F.FWD

and

REV

modes.

Adjust

Reel

Table

height

so

that

the

tape

winds

on

the

center

of

the

reels

at

both

modes.

2)

Tape

should

wind

on

center

of

reel

regardless

of

type

of

reel

used.

Vi.

HEAD

ADJUSTMENT

TAPE

GUIDE

HEIGHT

ADJUSTMENT

NUT REV

PLAYBACK

RECORDING

ERASE

HEAD

HEAD

HEAL

Fie

clis

sta

tar260

Re-240

©

(pazeo

Fig.

10

:

Test.

Tape

Adjustment

Step

|

Adjustment

ca

Supply

Signal

Mode

Point

Remarks

|

ee

——

.

Tape

Guide

1)

Adjust

so

that

tape

travels

|

1

Tape

Guide

Optional

FWD

Height

smoothly

and

does

not

twist.

Height

Adjustment

2)

Do

not

thread

tape

over

tension

Nut

arm.

.

Upper

edge

of

channel

1

head

core

FWD

Erase

‘ .

2

:

Optional

FWD

A\(B\C

is

0.1mm

higher

than

upper

edge

Head

Height

P

(ABYC)

of

tape.

FWD

Recording

.

Upper

edges

of

channel

1

head

core

3

Head

Height

Optional

(DXE)(F)

and

tape

are

the

same

height.

FWD

Playback

;

Upper

edges

of

channel

1

head

core

4

Head

Height

Optional

(GH)

and

tape

are

the

same

height.

=i

|

FWD

Playback

8,000

Hz

|

§

Head

Azimuth

3-3/4

ips

FWD

qd)

|

Maximum

output,

both

channels,

Alignment

Test

Tape

Adjust

head

gap

surface

so

that

FWD

Playback

8,000

Hz

there

is

no

change

in

output

level

6

Head

Gap

3-3/4

ips

FWD

(K)

when

tension

is

applied

to

the

sup-

Alignment

Test

Tape

ply

reel

side

‘|

FWD

Recording

|

Scotch

#211

Tape,

r

i

|

7

Head

Azimuth

15,000

Hz

REC

(F)

|

Maximum

output,

both

channels,

Alignment

—20

dBm

;

Adjust

head

f

that

FWD

Recording

|

Scotch

#211

Tape,

sles.

is

-

ree

or

sid

eel

8

Head

Gap

15,000

Hz

REC

@)

when

tension

is

applied

to

the

sup-

Alignment

—20

dBm

|

ply

reel

side,

Chart

1

NOTES:

1)

As

perfect

head

adjustments

are

vital

to

tape

deck

performance,

be

sure

that

these

adjustments

are

carried

out

properly.

2)

Be

careful

not

to

use

a

magnetized

driver

or

other

magnetized

tools

in

the

vicinity

of

the

heads.

3)

Use

only

new

tape

as

level

variation

is

likely

to

occur

when

using

old

tape.

4)

Demagnetize

heads

with

head

demagnetizer

before

and

after

head

adjustment.

5)

Set

tape

speed

to

7-1/2

ips

except.

6)

Adjustments

outlined

in

Chart

1

are

only

for

FWD

side

heads.

However,

adjustments

for

REV

side

heads

are

exactly

the

same.

Vit.

ELECTRICAL

ADJUSTMENT

1.

DC

POWER

SUPPLY

AND

TAPE

SPEED

ADJUSTMENT

Seika

Mian

SP:

Sat

sah

tise

iia

Saha

89

Pinte

cairo

12%

VR-1

1kB_

DC

Voltage

Adj.

VR-2

50kB

3-3/4

ips

Tape

Speed

Adj.

VR-3

10kB

7-1/2

ips

Tape

Speed

Adj.

VRI

VR3

VR2

Fig.

11

Adjustment

.

Step

Item

Mode

Adjustment

Point

Result

Remarks

=

==

4

1

DC

Voltage

|

Stop

VR-11kB

24.0V

Measured

at

TP-1

on

Sys.

Con

P.C

Board

3-3/4

ips

500

Hz

1,000

Hz,

7-1/2

ips

Test

Tape.

2

Tape

Speed

FWD

VR-2

50

kB

£0.5%

Tape

Speed

3-3/4

ips.

7-1/2

ips

1,000Hz

1,000

Hz,

7-1/2

ips

Test

Tape.

3

Tape

Speed

FWD

VR:3

10

kB

40.5%

Tape

Speed

7-1/2

ips.

Chart

2