Akai GX-635D Bedienungsanleitung

é'

;.j-i-ii;'i

STEREO TAPE DECI(

Mo,)',,

GX'635D

SECTION

1 SERVICE

MANUAL. I

SECTION2

PARTSLIST.. ........43

SECTION3

SCHEMATIC

DIAGRAM ......67

I. TECHNICAL DATA

TRACK

SYSTEM

REELCAPACITY

TAPESPEED

WOW

& FLUTTER

FREQUENCY

RESPONSE

DISTORTION

(1.000

"0" VU)

SIGNAL

TO NOISE

RATIO

ERASE

RATIO

CROSS

TALK

CHANNEL

SEPARATION

BIAS

FREQUENCY

HEADS

MOTORS

REALTIMECOUNTER

FF & RWD

TIME

OUTPUT

JACKS

INPUTJACKS

DIN JACK

DIMENSIONS

WEIGHT

POWER

REQUIREMENT

* Specificationsdetermined with Akai LN-150-7 or SCOTCH #21

* For improvement'purposes' specifications

and design

aresubject

4 lrack 2 channel stereo/monaural system

to 10-l/2"

reel

19cm/s

x0.8%

-l12

ips)

9.5

cm/s

xl.0%

(3-314

ips)

(Pitch

control: more

lhan

t6%)

Less

than0.03%

WRMSat 19cm/s

Less

than

0.04%

WRMSat9.5

cm/s

Less

than

0.08%

DIN

45500

at 19

cm/s

Less

than0.10%

DIN45500

at9.5cm/s

to 27,000

dBat19

cm/susing

Tape

30to 21,000Hz

dBat9.5

cm/s

using

WRTape

to 25,000

t3 dBat19

cm/susing

LNTape

to 19.000

Hz 13dB at9.5cm/susing

LN Tape

Less

than 05% aI 19 cmls

Better

than62

dBDIN45500

Better

than70dB

(at

1,000Hz)

Betterthan

(at

1,000

Hz)

Better

than55dB

(at

1,000

Hz)

100

kHz

(6): Two GX Recording Heads,

Two GX Playback Heads,Two Erase

Heads

(3): One

ACServoMotorfor capstan

Drive

TwoACEddy

currentMotors

for Reel

Drive

to 99

min59sec,

Less

than

r1.5%

120

sec

using550m

(1,800

ft.)TaPe

Line

(2): 0.775V

VU)

Required

loadimpedance:

than

20kohms

Phone

(1): 100

mV/8ohms

Microphone

(2): 0.25

Requiredmicrophone

impedance:

600ohms

LINE

(2): 70mVimpedance

100

kohms

Input2.0mV,

impedance

l0 kohms,

Ot 0.3V

440(W)

x483(H)

x 256(D)

mm, (17.4

x 19'0

x 10.1")

2l ke(46.4

lbs)

100V.50/60

HzforJPN

120V,60

forUS

& Canada

2201240V,50

Hz for Europe,UK and

Australia

1lO

|120

|220

240V,5

0/60Hzinternally

switchable

for other

countries

1tape unless

otherwise noted.

to change

without notice.

II. DISMANTLING OF UNIT

In case

of trouble,etc.necessitating

dismantling,

please

dismantle

in theordershownin thephotographs.

Reassemble

in reverse

order.

SCREWSA ffML KrcBS

)

III. CONTROLS

1. PITCH

CONTROL

2. SUPPLYREELTABLE

3. BUILT-IN

REELRETAINER

(Left}

4. LEFT

TENSIONARM

5. PINCH

ROLLER

6. RECORDINGMUTE

SWITCH

(REC

MUTE)/TIMING

LAMP

7, REEL

SIZESELECTOR

8. REVERSE

SELECTOR

9. POWER

SWITCH

10. VUMETER

(Right)

11. VUMETER

(Left}

12. TAPESELECTOR

13, TAPE

SPEED

SELECTOR

14. TIMER

START

15. HEADPHONE

JACK

16. OUTPUT

LEVELCONTROL

Fig.I Controls

17. MONITORSWITCH

18. REAL TIME COUNTER

and RESET

BUTTON

19. TAKE-UP

REELTABLE

20. BUILT-lNREELRETAINER

(Risht)

21. RIGHTTENSIONARM

22. HEAD COVER

23. RECORDING

INDICATORLAMP

24. PAUSEINDICATOR LAMP

25. REVERSEDIBECTION/STAND

BY INDICATOR LAMP

26. FORWARD DIRECTION/STAND

BY INDICATOR LAMP

27. MODE BUTTONS

28. MICROPHONEINPUT

CONTROLS

29. MEMORYMARKERS

30. LINE INPUTCONTROLS

31. MICROPHONEJACKS (Left/Right)

32. RECORDING

MODE

SWITCH

IV. PRINCIPAL PARTS LOCATION

BRAKE

MICRO

SWITCH

sw906

BRAKE

PLUNGERSL9O3

RNCHROLLER

PLUNGERSL9O2

PAJSE

PLUNGERSL9O4

PIÍCH CONTROL

VOLUME

VR9OI

REAL

TIME

COUNÍER

TENSION

ARM

(R)

HEAD

BLOCK

PHONESJACK

OIJTPUTLEVELCONTROL

VOLUME

RECMOOESWITCH

TAPESELECTORSWITCH

OPERATIONELOCK

REC

MODE

INOICATOR

MIC

rl- RÊcLEVEL

rrrup

J VOLUME

Fig.2 Front View

MONITORSWITCH TAPESPEEDSWITCH

TENSION

ARM(L}

RECMUTESWITCH

SW9O4

REELSIZE S1,VITCHSW9O3

REVERSESELECTORSWITCH

POWERSWTTCHSW90l

",n,.** {.

IIMERSTARTSWITCH

REMO,CONJACKJ9O5 VOLTAGE

SELECTOR

REELMOTOR

RIGHT

M902 24XO-TD FUSE

PC BOARD

TH-20rro

SYS.CON PC BOARD

TH-rOr5

CAPSTANMOTOR

M903 SCM-200

PRE AMPPC BOARD

TH-500r4

Fie.

3 RearView

OPERATION

P,CBOARO

TH-2041

OPERATIONP.C

BOARO

ÍH-2042

VOLUMEPC BGRD

TH-5002

V. CIRCUIT OPERATING PRINCIPLES

1.SYSTEM

CONTROLOPERATION

SYMBOL TRUTH

TABLE

NOT

CIRCUIT

X=A

F-tfit

loll

I'IFI

NAND

CIRCUIT

X=AE

NOR

CIRCUIT

X=A+B

LOW

LEVEL

I: HIGHLEVEL

Chart-1

.3d:j*

HTiY

i usF

a! ,oi"dado lq m

_:i|.@

':,.+. +,

qEê

i^ -_.--;-È

I r r lío

!.1 r;;:,';r::;:r lHs

t'1 , io!

t. :.-:-.. -,r:(--!J u F

' I Íl o

aJ4s !r ?

Í tJ::'"'. :ln *

{ 3i

TÍ

ql :l

l= 11

|\;

ó ri+*:rBe

L"J i3

r'_f

$ ó"f|e

Lt É

Schematic-lSTOP

MODE

-L

.Íi

:tl

jó51 I

\t.E I

t-l

-*i

-_,_l

dË

-È

."*,ffi't" i* *"

;:Tm!!!@

*A;1'

,-o

-:---_..!;_Ë ^

I tgv

:' , toí

Ir+' r r .}l lLj

q;-r+;r;+;-;JPF

l3l "':ï'r;

,t:'*f;U; * *

'i: .ffilMffitutu

_t-.-_--_l_ Ë

I r r lgo

!.' l;* l:;:r lH3

:' ioq

| "- i tdi

t, .--:-..-;r;J_uts

i 1)- t: l

< irr; ',ií )

r Ê:'

Schematic-2

FWD-PLAYMODE

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