Akai GX-215D User manual

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3

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INGE

No.

1

PRELIMINARY

SERVICE

MANUAL

moveL

GX-2l9D

e

DATE

January

1977

Technical

Data

Track

System

-

Reel

Capacity

Tape-

Speed

Wow

&

Flutter

Frequency

Response

Distortion

Signal-to-Noise

Ratio

Erase

Ratio

Bias

Frequency

Heads

Motors

FF

and

Rewind

Time

Output

Jacks

Input

Jacks

DIN

Jack

Semi-conductors

Power

Requirements

Dimensions

Weight

4

track

2

channel

stereo/monaural

system

Up

to

7"

reel

7-1/2

and

3-3/4

ips

Less

than

0.09%

RMS,

0.17%

(DIN

45

500)

at

7-1/2

ips

Less

than

0.18%

RMS

at

3-3/4

ips

30

to

25,000

Hz

*3

dB

at

7-1/2

ips

30

to

19,000

Hz

*3

dB

at

3-3/4

ips

Less

than

1%

(1,000

Hz

"0"

VU)

Better

than

56

dB(measured

via

tape

with

peak

recording

level

of

+6

VU)

Better

than

70

dB

100

kHz

(3):

One

GX

playback,

one

GX

recording

and

one

erase

head

(3):

One

4/8

pole

self

lubricating

hysteresis

synchronous

capstan

drive

motor

and

two

eddy

current

outer-rotor

reel

drive

motors

90

sec

using

1,200

ft

tape

Line(2):

0.775V(O

VU).

Required

load

impedance:

more

than

100

k

ohms

Phone(1):

50

mV/8

ohms

Microphone(2):

0.3

mV/2.2

k

ohms.

Required

microphone

impedance:

600

ohms

Line(2):

70

mV/100

k

ohms

Input

0.3

mV/Output

0.5V

Transistors

27,

Diodes

17

CSA,

UL

and

LA

Models:

120V,

60

Hz

only

CEE

Models

:

220V,

50

Hz

only

Other

Models:

110/120/220/240V,

50/60

Hz

switchable

380(W)

x

390

(H)

x

295(D)

mm,

(15.0"

x

15.4"

x

11.6")

15.7

kg

(34.6

lbs)

NOTE:

For

improvement

purposes,

specifications

and

design

are

subject

to

change

without

notice.

i

i

a

Ne

en

AKAI

ELECTRIC

CO.,

LTD.

(P.0.BOX

21,

Tokyo

International

Airport,

Japa

)

12-14,

2-chome,

HigashiKojiya,

Ohta-ku,

Tokyo,

Japan

Printed

in

Japan

No.

MODEL

GX-215D

1.

Principal

Parts

Location

LHOIW

14377

TGAS1

O34

Y3MOd

¥YOLISTSS

HOVaL

310d

ONISNSS

QM4

NVLSdVO

SO6

MS

HOLIMSOYNDIW

dO

AOTA

JUOLT

t

‘stg

1437

SIN

=

YOLDATSS

3dvL

YALNNOD

3dVL

Y3ZIIVNOA

1437

|

Y3LAW

NA

LHOIY

Q33dS

3dVL

49018

GV3H

310d

ONISN3S

A3ZY

MS

NOISN3L

No.

MODEL

GX-215D

MeTA

Teey

7

“ITY

GYuVOS

Id

dAV

SIesS-NW

GYuVvOs

9d

YOLISTAS

MOVYEL

1067S

YZONNId

GION3S1OS

A3Y

VaSHMAIS

1138

3Alud

YW-OXb2

YOLOW

1338

1337

SW9I-2WH

YOLOW

NIVW

8lel

AW

QYVOE

Id

TOULNOD

W3LSAS

MOVP

Nid/

NIG

YOLISTSAS

JOVLIOA

pIES-NW

GuVvos

dd

AlddNS

Y3MOd

YAWXOISNVEL

YSMOd

YW-OX

be

YOLOW

14334

LHOIY

i738

Y¥aLNNOo

P

MODEL

GX-215D

NG)

es

MODEL

GX-215D

No.

>

2.

Mechanism

Adjustment

1)

Reel

Table

Height

Adjustment

As

shown

in

Fig.

3,

loosen

reel

table

height

adjustment

screws,

and

adjust

reel

table

height

by

moving

table

in

direction

of

arrow

and

positioning

so

‘air

||

Hil:

that

the

tape

winds

in

the

center

of

the

reel.

ett

pbc

ieheasneharae

tues’

as

Brake

tension

adjustment

can

be

made

as

follows:

(Refer

to

Fig.

4)

fae

|

=a

a)

Change

position

of

suspended

spring

(a).

RU

P

—_—_

b)

Leosen

screw

(b)

and

adjust

the

vertical

position

of

spring

suspension

uF

&

metal

(c).

rr

if

Loosen

screw

(d)

and

adjust

the

horizontal

position

of

brake

band

suspension

metal

(e).

REEL

TABLE

a)

Only

the

left

side

is

shown

in

Fig.

14,

but

the

right

side

must

be

adjusted

in

the

same

way.

NOTE:

In

making

brake

tension

adjustments,

at

all

modes

except

stop

mode,

confirm

that

the

brake

band

completely

separates

from

the

cloth

tape

on

the

brake

drum.

(Refer

to

Fig.

4)

Left

and

Right

Reel

Motor

Tension

at

Various

es

Modes

ee

Reel

|

_Reel

Motor

|

Reel

Motor

FWD

PB

REV_BB

P.EWD

a

:

RWD

Chart

1

Flywheel

Loose

Play

Adjustment

Turn

the

adjustment

screw

to

obtain

a

0.3

mm

gap

between

the

steel

ball

and

bearing

when

the

flywheel

is

moved

in

the

direction

of

the

arrow

as

shown

in

Fig.

5.

Flywheel

Belt

Position

Adjustment

1)

With

capstan

motor

revolutions

operating

at

Rev.

mode,

loosen

setting

screw

and

turn

flywheel

belt

position

adjustment

screw

until

the

flywheel

belt

comes

to

the

center

of

the

motor

pulley.

(Refer

to

Fig.

6)

Tighten setting

screw

to

maintain

center

positioning

of

flywheel

belt

at

Rev.

mode.

Confirm

that

the

flywheel

belt

runs

on

the

center

of

the

motor

pulley

at

Fwd.

mode

also.

No.

6

No.

MODEL

GX-215D

SS

MODEL

GX-215D

a

ee

ADJUST

WITH

DRIVER

(Wied

Vi

FLYWHEEL

EE,

UMMM

pLLLd

LLL

LR

LLL.

MECHANISM

CHASSIS

BEARING

PLATE

6)

Shifter

Lever

Adjustment

motor

PULLey

(===

CAPSTAN

MOTOR

MECHA

CHASSIS

Loosen

screw

(a)

and

adjust

by

moving

shifter

lever

(b)

so

that

at

play

mode

the

gap

between

shifter

lever

(b)

and

angle

plate

(c)

is

2~3

mm.

SSSeaersstoresssy

ADJUSTING

SCREW

RANATU

RS

CATER

ROSE

RRART

CENT

MOTOR

PROP

SETTING

SCREW

MODEL

GX-215D

No.

8

MODEL

GX-215D

Test

Tape

Adjustment

F

Remarks

Step]

Adjustment

Item

Supply

Signal

Point

wen

saa

Upper

edge

of

Chl

head

rase

: 2

: :

core

is

0.1

mm

higher

Height

Optional

Play

|

(A)(B)(C)

shunsitner

edge

oF

the

Adjustment

tape

5

Upper

edge

of

Chl

head

ia

eta

rae

Opti

i

Pl

(D)

(E)(F)

core

is

the

same

height

ne28

Piso

ay

as

the

upper

edge

of

the

Adjustment

1

tape

Playback

Head

Fwd

Height

Optional

Pla:

(G)

Same

as

Step

2.

Adjustment

(FWD)

y

Lower

edge

of

Ch2

head

pe

er

Optional

Rev

(K)

core

is

the

same

height

he

1

d

f

th

Adjustment

(REV)

Play

oH

e

lower

edge

o

e

Playback

Head

8,000

Hz

F

Maxi

tput,

both

Azimuth

9.5

cm/sec

ods

(H)(1)(J)

saan

AE

Pie

Alignment

test

tape

y

7

Adjust

head

gap

surface

Playback

Head

8,000

Hz

Fwa

so

that

there

is

no

Gap

9.5

cm/sec

Pla

(L)

change

in

output

level

Alignment

test

tape

y

when

tension

is

applied

to

the

supply

reel

side.

Scotch

#211

Recording

Head

tape,

es

7

E

Same

as

Step

5.

an

Chart

2

3.

Head

Adjustment

Scotch

#211

Recording

Head

tape,

Gap

15,000

Hz

Alignment

~20

WU

recording

Azimuth

15,000

Hz

Rec

Alignment

-20

VU

recording

a

TO

.

Set

Tape

Speed

to

7-1/2

ips

(19

cm/sec).

Regarding

Step

3,

when

replacing

a

head

or

for

slight

head

adjustment,

do

not

ERASE

HEAD

REC

HEAD

move

screw

(G).

Adjust

with

screws

(D)(E)

and

(F)

and

then

make

the

next

Step

E4-260

R4-240

4

adjustment.

MODEL

GX-215D

-.

a 4

cis

i

o

.

7

)

POL

RIESE

Te

¢

weet

vee

Y

ok

AH

a

a

Ly

ee

AA

No.

10

Fig.

9

Amp

P.C

Board

MU-5316

MODEL

GX-215D

4.

Recording

and

Playback

Amplifier

Adjustment

No.

ll

Adjustment)

Test

Tape

Adjustment

tee

P

:

R

t

R

ee

Item

Supply

Signal

|

Point

esul

emarks

rod

Playback

|

700

Hz

7-1/2

ips|

FWD

VR3

50

kB

=

Sensitivit

Test

Tape

PLAY

|

(MU-5316)

O

dBm

+140

dB

in

relation

*o.5

dB

|

to

O

dBm

at

RVS

mode

non

VW

indication

SCOTCH

#176

REC

Monitor

Switch

to

tape

1,000

Hz

and

REC

Volume

7

dBn

TAPE

position

and

"O"VU

recording

|

PLAY

VR1

50

kB

“0.5

dB

|

Tape

Selector

to

:

LOW

NOISE

position.

Recording

Level

SCOTCH

#176

tape

1,000

Hz

"O"VU

recording

VR2

5

kB

(MU-5316)

SCOTCH

#176

Frequency

|

tape

1,000

Hz,

Response

j10,000Hz

-20 dBm

C29(Left)

C30(Right)

recording

(MU-5

316)

L3

23

mH

5

Bias

Leak

REC

(MU-5316)

Monitor

Switch

to

0

Bm

SOURCE

position

+3.5

aB

and

Tape

Selector

to

LOW

NOISE

position.

passe

ce

Tape

Selector

to

LOW

NOISE

position

and

Tape

Speed

to

3-3/4

ips.

to

1,000

Hz

relation

With

Monitor

Switch

to

TAPE

and

SOURCE

Less than

-30

dB

positions.

.

12

MODEL

GX~215D

Now

oe

=

MODEL

GX-215D

Norske

3.

DC

Resistance

of

Various

Coils

7.

Basic

Parts

List

Parts

No.

BA27

2002

BA272013

BA272024

BA272081

BA27

2698

BA272711

BA272092

BA272182

BC249164

BF271934

BM271912

BS271923

BT249388

BT249401

BT

249390

BR271945

Designation

Syscon

P.C

Board

Comp.

MU-1318

Syscon

P.C

Board

Comp.

MU-~1318

Syscon

P.C

Board

Comp.

MU-1318

Amp

P.C

Board

Comp.

MU-5316

Amp

P.C

Board

Comp.

MU-5316

Amp

P.C

Board

Comp.

MU-5316

Track

Selector

P.C

Board

Cump.

MU-5315

Power

Supply

P.C

Board

Comp.

MU-5314

Wood

Frame

MU-6308

Flywheel

Block

Comp.

Motor

(HM2-16MC)

Block

Comp.

SW.

Block

Comp.

Power

Trans.

MUT-5

Power

Trans.

MUT-7

Power

Trans.

MUT-6

Reel

Table

(L)

Block

Comp.

BR271956

Reel

Table

(R)

Block

Comp.

EC207898

Trimmer/C.

TM-110

100PF

C29,C30(MU-5314)

ED249581

Diode

SIQB20

0.8A 200V

(Red)

D2

(MU~5314)

EL619064

Lamp(L/T)

24V

35

mA

1ND901

DC

Resistance

Between

PNK-RED

130

ohms

Main

Motor

HM2-16MC

Between

PNK-~BRN

180

ohms

Between GRN-GRY

360

ohms

Between

GRN-YLW

370

ohms

Reel

Motor

24X0-MR

Between

BLU-RED

47

ohms

Between

YLW-GRN

166

ohms

Reverse

Solenoid

840FHT1

Plunger

48V

220

ohms

MY4—02-US

DO24

220

ohms

*15%

Reed

Relay

1,600

ons

Headphone

N19-3498

Primary:

160

ohms

*15%

Output

Transformer

Secondary:

0.64

ohms

+15%

Between

1-3

0.3

ohms

OT-204

Between

4-6

0.7

ohms

Between

7-9

8.2

ohms

Oscillator

Coil

Erase

Head

Recording

Head

Playback

Head

*

Resistance

values

shown

in

this

chart

are

average

values.

EM666450

£0383365

VU

Meter

OSC

Coil

D18A68R

OT~204

M901,M902

Tl

(MU~5316)

6.

Classification

of

Various

P.C

Boards

EP249344

EP249647

EP6

38763

ES562465

ES479485

ES258467

:

ES258232

ES249254

ES249276

ES224436

ES

242346

Reed

Relay

124

RL1

(MU-5316)

Plunger

Solenoid

SDCO840FHT1

SL901

Relay

MY4-0-US

DC24V

L1

(MU-1318)

Micro

SW.

K-l

SW905

Slide

SW.

S-1

SW903

Slide

SW.

SSB-022

Sw904

Slide

SW.

S-2930

SW1

(MU-1318)

Push

SW.

SUE-12

SW1

(MU-5316)

Push

SW.

SUE-24

SW2

(MU~5316)

Push

SW.

JPOL

U/T,

CSA

Push

SW.

JP17

CEE

1)

Amp

P.C

Board

MU-5316—

2)

Track

Selector

P.C

Board

MU-5315

3)

Power

Supply

P.C

Board

MU-5314

4)

System

Control

P.C

Board

MU-1318

MODEL

GX-215D

Parts

No.

EV

249243

HE563220

HP271978

HR271980

MB541012

MB247904

MC259312

MP271170

$K249096

SK259345

8K631056

SK264892

8K634410

SK694888

SP247408

Designation

Vol.

V24L52PHN60R

154

50k

ERASE

HEAD

E4-260

PB

HEAD

P4-240

REC

HEAD

R4-240

Drive

Belt

(Flat)

MC-1209

Counter

Belt

MU-1302

Counter

MU-3

Pinch

Roller LC-321

Mecha

Knob

MU-6303

Pause

Knob

(C)

MR-612

Single

Knob

MY-6208

Selector

Knob

B

CI-6020

Push

Button

Knob

J

91-5051

Knob

3

CP-5019

Front

Panel

MU-6307

Note

VRi

(MU-5316)

No.

14

No.

15

MODEL

GX-215D

8.

List

of

Interchangeable

Semiconductors

As

for

as

service

in

concerned,

in

case

the

original

parts

cannot

be

obtained,

the

interchangeable

parts

listed

below

can

be

substituted.

Interchangeable

Parts

Original

Parts

|

ET391768

ve

28C693U(F)

(G)

ET429647

2S8C1000(BL)

(GR)

ET622181

28C1312(F)(G)

ET539987

ET635837

MU-5316

2805

36(E)

(F)(G)

(H)

ET246846

E1639437

MU-1318

28C711(E)

(F)(G)

(H)

ET619727

28C1641(Q)(R)(S)(E)

ET603843

[ereoses7

|

wossie

__—descasaua(oy(a)

—=«saeu76a

ET242390

MU~5314

28D313(D)(E)(F)

ET522911

1N60

ED428204

)

S2473

ED624903

MU-5316

181588

ED557447

$2473VE

ED560913

MU-1318

WG599

ED514721

ED224550

MU-1318

|

1N4004

ED570273

none

Papezesea

|

—dataoos

«0085

2240

ED511918

MU—5314

RD24A

ED229072

RD24A(MN)

ED315415

L-3ARI

e0249377_|___Mv-5318

aaa

a