Akai GX-230 User manual

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SECTION
I SERVICE MANUAL
SECTION] PARTS
LIST
SECTION3 SCHEMATICDIAGRA}Í
....
I
23
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I
SECTION
I
SEtrIVICE MAI\ITJAL
TABLE
OF
CONTE\TS
I SPECIFICATIONS
II. DIS\I\NTLING OF UNIT
III. .\RR-\,NGENÍENT
OF TÍAIN PARTS
IV. }fECHANISNÍ
ADJUSTIIIENT
I. .\DJUST}f
ENT OF PINCH\\'HEEL
PRESSURE
]. BRAKE TENSION
ADJUST\IENT
3. .\DJUST\ÍENT
OF REEL
TABLE HEIGHT
.I. .\DJUSTIvÍENT
oF CAPSTAN
\{oToR SHAFT LooSE PL.\Y
.i. .\DJUST}IENT
OF II,IPEDANCE
ROLLER
SHAFT LOOSE
PLAY ,
6. HEIGHT .\DJUSTMENT
OF TAPE
GUIDE
ON TENSION
.{RM
: .\DJUST}IENT OF TENSION
ARN{
\fICROSWITCH
SW-9
POSITION
. .
8. .{DJUST}IENT
OF RECORDING
SLIDE
SWITCH
(SW-IO)
TI\ÍING...
9. .\DJUSTillENT
oF FF MICRoSwITCH (SW.-s)
.\CTUAToR PoSITION
10. .\DJUST\Í
ENT oF PLAY \ilcRoswtrcH (sw-r ¡nd SW-il r
.\CTIVATOR POSITION
\. HEAD .\DJUST\ÍENT
VI. .\}IPLIFIER SYSTEMADJUSTI\IENT
I PO\\'ER
SUPPLY
VOLTAGEADJUST},ÍENT
:. T\PE SPEED
ADJUSTNÍENT
.
3 RECORDING.
PLAYBAC]K
AMPLIFIER
.\DJUST\IENT
VII. D.C. RESISTANCE
OF VARIOUS COILS
VIII. CLASSIFICATION OF VARIOUS P.C.
BOARDS
I. P C. BOARD
INTERCIIANGE,\BILITY
CIIART
] CO\IPOSITE
VIEWS
OF ('O\IPONE\TS
[:r.i i'r:lc.idJusin]cnts. ntc.lsLlnngntetltods. lnd opc:-,l:^ltg
prlltelDic's.
rcfer lt.r
(;E\ER.\L OPER.\
fIN(;I'RINCIPI-ES.\\D ,\I)JL'S
f\IENTS
l
-t
6
7
7
¡l
9
9
t0
l0
il
ll
t2
lz
¡3
l5
t5
t5
l6
l7
l7
l7
l8

I
I. SPECIFICATIONS
An astersk next to a figure indicates the minimum guaranteed performance.
TRACK SYSTEM i 4 track 2 channei
stereo
svstem
TAPESPEED 7-ll2and3-314
ips.
x0.7%
*'l-ll2 ips.
(19
crn/sec.)
xl.Mo
*3-3l4
ips.
(9.5
cml
Lessthan0.07%
RMS.
at 7-ll2iPs.
Less
than0.i% RMS.at3-3/4
ips.
*Less
than0.l0Voat 7-Il2 iPs.
FWD
*Less
than0.I2% at'l-ll2 ips.
REV
*
Less
than0.15%
at 3-3 4 ips.
FWD
*Less
than0.l8Vo
at3-3/4
iPs.
REV
*Less
than0J2% at 7-ll2 ips.
*Less
than
0.I8%
at3-314
ips.
30to 23,000Hz
t3 dBat 7-ll2 ips.
lwith Akai LN Tapel
30to 19,000
Hz
t3 dBat3-314
ips.
(with Akai LN Tape)
30to 22.000Hz
t3 dBat
7-ll2 ips.
30
to 18.000 Hz
t3 dB
at3-314
i
Less
than 1.07o
Lessthan 1.5%at 7-ll2 ips.
WOW
& FLUTTER
TOTAL
WOW
& FLUTTER
FREQUENCY
RESPONSE
DISTORTION
TOTAL DISTORTION Lessthan25% at 3-314
i
SiNRATIO Betterthan54dB
*Better
than50
dB
TOTALS/N
RATIO *Betterthan45 dB
OUTPUT LINE 0.775V
(0 t I dB/O
t 1.5
dB.
FWD/REV)
DIN 700Hz "0" VU Prerecorded
tape,
output volumemaximum'
0.5v
INPUT MIC
LINE
DIN
\f ore than 0.3 mV
Morethan 70mV
Morethan3 mV
RECORDING/PLAYBACK
LEVEL
CROSS
TALK
ERASERATIO
RECORDING
BIAS
FREQUENCY
BTAS
LEAK
HIGH FREQUENCYDEVIATION
(at "0" VU output,recording
volumemaximum),
0.775V
(0
t 1.5
dB)
Better than 40 dB
(1,000Hz +3VU recordi
Better than 70dB
(1,000Hz +3VU recording)
100
t 10
kHz
Better
than -30 dB
Within 3 dB
(8,000
Hz. 3-314 ipt. ta
90 minutes. stereo
recording,
using
a 1,800ft. tape
at 7-ll2 ips'
RECORDING
TIME
FASTFORWARD
AND REWIND
TIME Approxrmately120seconds,
using
a 1.800ft. tape
¿1!9 FIz.
\IOTOR MAIN MOTOR
REEL
}IOTOR
2 speed A.C.Servo
Conuol Outer Rotor Motor
Type: SCM2-24K1,4
pole
Revolutions:6l5 r.p.m.
at 7'Ll2 ips.
(19
cm/sec.)
307.5
r.p.m.
at 3-314
iPs.
(9.5
cmisec.)
Two 6-pole eddycurrent
Outer Rotor Motors
Type: 24XGMR
Revolutions:930
r.p.m.
at50 Hz
HEAD COMBINATION
RECORDING/ERASE
HEAD | 1,120
r.p.m.
at
60Hz
Type: RE4-6
Gap: Rec: 4¡¡
Erase:Double
GaP
lmpedance:
Rec:i,400
ohmt25% at 100
kHz
Erase:130
ohm t7% at lO0kÍlz
D.C.Resistance: Rec:
5.5 ohm
Erase:
1.8ohm
Type: P4-202
Gap:1.7¡r
t0.51
Impedance:1,400
ohm at I kHz
D.C.Resistance:
268ohm
PLAYBACK HEAD

I
TRANSISTOR 2SA564(PXQ)
.. . i
2SC4s8LG(C)...16
2SC945(PXO.
..
20
2SC1247A...
I
2SD361(DXE)...1
2SD361(DlXD2)...1
TlP48.
.
.1
DIODE 1N34A...2
10D05...4
toDl
... I
10D2...+
15-1588...
1
ls-2473VE...
r
RD-sA(M)...1
582...1(GX-230only)
10D4...5
STK-015
...2 (GX-230
only)
POWER
SUPPLYANDPOWERCONSUMPTION 100
to240VA.C.
50/60
Hz,90W
Universal
Models
240V
A.C.50
Hz,90W
BSI
Models
220V
A.C.50
Hz.90W
CEE
Models
l20V
A.C.60H2,90W
CSA
Models
100V
A.C.50/60
Hz.
60/65W
JPNModels
RecorderTvoe:
l20W
DIMENSIONS 441(W)x
404(H)
x 210(D)mm
(l'7.4"x15.9"x8.3")
Dimensions
include
ail
GX-230D 15.2
ks
(33.4
lbs.)
cX-230 16.7
ks
(36.7
lbs.)
NOTES: l. Specificaüonsdetermined with Scotch #2ll tape unlessotherwise noted.
2. SpecificationsSubject to changewithout notice.

I
II. DISMANTLING OF UNIT
In caseof trouble, etc. necessitating
ciisassembly,piease
disassemble
in the order shownrn photoeraphs.
Reassemble
in reverse
order.
HEAD
COVER
: ': Ft t=t rftsf ¡
---oII O-O
ffiE
SCREv'jS
:^
iuBBER
-,tlOT i
CONTROL
KNOBS
OO
-RONT
F]\EL D
gt,
-l
I
I
o
NCH ROLLPI ER CAP
ADJU-S-:'If
NT

T
]CNNECTION
PLUGS
{ffi
¡ -tl
q"ffi
_.¿J*i
:?.i
- -
:-f--¡'-
:.RE\,VS AfvlP
BLOCK

I
III. ARRANGEMENTOF MAIN PARTS
FAST
2
:ssiMELY
TENSICN
SiV'9
KEY SUTTCN
ELOCK
"¿¡U5E : 't ó
LEFT REEL
MOTOR
POWER
TRANSFORMER
POWER
S"PPLY
PC.
30ARD 'lY- 2037
s
,r'6
E
,'tt'=
3
-
GFi,
rlf
-
g-
HEAO
BLOCK
a
RIGHTREEL MOTOR
:ERVO:CNTROL EC.
3OARD
MY-2C36
:t ^v c,¡/ ?
iF SW5
VAIN MOTCR
?EC, SW, P
C
BOARD
MY-2044
-'¡sc.
I i5c. a[4P oc,
SOARD
lt'1
r-:-'6
/B 1-
!
I
tü
t#-=
-ñ'
---
.1t--

T
IV. MECHANISM ADJUSTMENT
-BRAKE
LEVERB
BRAKELEVER
A-
_-l8Oo-.
SOLENOI
D
FIXATION SCREWS
''ATSTOP
MOOE
"
Fiq,2
I. ADJUSTNÍ
ENT OF PINCH 1VHEELPRES-
SURE
(Refer
to Figs.I and
2)
I) Unfasten Microswitch (SW4) Activation Adjust-
mentScrewsCandC'.
2) At play mode, confirm that Brake Lever A and
Brake Lever B are placed at a 180" angle in
relation to each other. If necessary,adjust the
angleby changrng Play Solenoid
(SL-l) position.
3) Adjust prnch wheel
pressure
to 1.5
t0.l kgr-cmby
re-positioningPlate
A andAngieB.
SCREW
C -
SCREW
CAPSTAN SHAFT
PINCHWHEEL
4) Then, at stop
mode.
fasten
screws
C andC' sothat
the clearance
between the body of Microswitch
SW4 (with time delay) and the actuator of the
microswitch
isapproximately
0.5 mm asshownin
Fig.2.
@
XO5mm
SPRING
-J
sw-4

I
SOmm-
BRAKE
BANDSUSPENSION
METAL
BRAKE BAND .
2.
BRAKE TENSION
ADJUSTMENT
(Refer
to
Figs.
3and
4)
l) As shown
in Fig. 3, use
a 60mm diameter
tape
wound on a 5" reel and set both left and right
braketension
to approximately
350gr-cm.
Deviationof left and right tensionmustbewithin
50 gr-cm.
2) Brake tension can be adjustedby changingposi-
tion of the Suspended
Spring.
If necessary,
change
Fig.3
METAL
X Confirmthot boih ore
coírpl€loly soporoted Fig.4
the position of the Spring SuspensionMetal or
replacethe spring.
3) At all modes except stop mode, confirm that
neither of the brake bands touch the cloth tape
around the brakedrums.
ERAKE DRUM
A
v