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  9. Akai GX-265D Troubleshooting guide

Akai GX-265D Troubleshooting guide

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SERVICE
MANUAL
iL
PART
SUSTES
AKAI
STEREO
TAPE
DECK
MODEL
CsM=e@65
|
STEREO
TAPE
DECK
mopEL
GX-265D
SECTION
1
SERVICE
MANUAL
SECTION
2
PARTS
LIST.
...........
SECTION
1
SERVICE
MANUAL
TABLE
OF
CONTENTS
L
SPECIFICATIONS
*
i
i5hsshatiscichsssctaceh
hess
acesstescttis
sas
caanes
Meaveccaseesoibeves
thensardanatech
edetivcbiniadees
eee
Il.
DISMANTLING
OF
UNIT
III.
ARRANGEMENT
OF
PRINCIPAL
PARTS.
.u.....ccccccessssesssesesseseeseseserecsesenenenensesecessesnenseaeeeeeeaseesinaeess
7
IV.
MECHANISM
ADJUSTMENT.
............:cccccsscccsssessssescsscsessssscssesssseeseseesesesssenecssssseecseseesreseseeeeseeesssenecarsesanes
8
POSITION
ADJUSTMENT
OF
PINCH
WHEEL
SOLENOID
SL-3
o...sesssscsecsssessseesesseeteeseeneeeees
PINCH
WHEEL
POSITION
ADJUSTMENT
AT
STOP
MODE
_
.uw..seccceseeeeesstseersseaeeeneenenerene
PINCH
WHEEL
PRESSURE
ADJUSTMENT
...---sssssesssssssssessseersesesenesesesenees
POSITION
ADJUSTMENT
OF
PLAY
HOLD
MICROSWITCH
SW-11
SLIDE:
ADJUSTMENT
|
corsscssnsscerccosstcconcosssnssosnsestsnosocssvesncneiesignaasasoovbsnsdcvessessedenst
POSITION
ADJUSTMENT
OF
QUICK
PLATE
oesssscesssessesseeesseesseerecesseseneaereeseenesesesnesenerieansennes
POSITION
ADJUSTMENT
OF
RECORDING
MICROSWITCH
SW-5
POSITION
ADJUSTMENT
OF
BRAKE
SOLENOID
SL-2
oseseseessesesssestseeeeseessneessesereeeesenenenens
9,
POSITION
ADJUSTMENT
OF
BRAKE
SOLENOID
MICROSWITCH
SW-8
.......sseeeee
cette
11
10.
BRAKE
TENSION
ADJUSTMENT.
.......::c:cscccsssssesesessessssssssssesesessseseseneneneseseusseecsnseaeenensereeeseerasesenanes
11.
PAUSE
ADJUSTMENT
.u..scsccccccssssssecscesssssesessssesencsesensneeesensseseneeseseaeenesesnneenensaes
tissasscguegnaueaadvnciestseess
12.
POSITION
ADJUSTMENT
OF
REVERSE
SOLENOID
SL-1
ooesessesssseesssseesssesesesesseeneeeneeeenenenes
13.
D
SWITCH
LEVER
ADJUSTMENT
......:..:::c:csssessssessetsseeeseteeeeseeerseeeseaesens
14.
INSTALLATION
POSITION
ADJUSTMENT
OF
REVERSE
JOINT
o..-sesssecseeeseseteteseneeenes
15,
INSTALLATION
POSITION
ADJUSTMENT
OF
HEAD
SWITCH
SW-3
16.
CAPSTAN
SHAFT LOOSE
PLAY
ADJUSTMENT
osesesssssssessecssssssesesesseesesseessaesensasasseceseneanneerngns
17.
OPERATING
POSITION
ADJUSTMENT
OF
TENSION
MICROSWITCH
SW-14
18.
TAPE
GUIDE
HEIGHT
ADJUSTMENT.
.....csccccscessscssesesesesseseesesesenessersesesesesenenssseseesenseneceasens
19.
REEL
TABLE
HEIGHT
ADJUSTMENT
oosesssssssscssssssescssssssesstessscensesnecssecesnessvesnecsanssneeessensecsnsente
HEAD
ADJUSTMENT.
-sccisciseveis
ceased
vosxegeteds
soit
bh
ncseibe
hous
cacts
heaveeiesvzchecadeanetaecesasareccutqua
de
aanenvassiansecenteeceeresdoee
AMPLIFIER
SYSTEM
ADJUSTMENT
.....-:::cccccccccccecceeeeescscncescessessscnensnnneeeneceneesecessesnaceecseseersceeacaserteseeeeses
1.
DC
POWER
SUPPLY
VOLTAGE
ADJUSTMENT.
-----s:sesesesee
Sadan
bedverddabaveieivvsrdl
deevns
seed
2.
TAPE:
SPEED
ADJUSTMENT.
cisicciestisicceccssscclesertiasacesadsnnsadnesenstedevencteeapescnancensoesendescnenasctnandecdetiedeedes
3.
RECORDING
AND
PLAYBACK
AMPLIFIER
ADJUSTMENT
.u.-s.ccesscccscesssesstetenntee
se
eeseeeenacenes
VII.
DC
RESISTANCE
OF
VARIOUS
COILS
ou.ccescccccssssessccssseseseesssesesecescenceescssedeseseseeeeeeaeseseseneraena
ee
sensnssenenss
VIIT.
CLASSIFICATION
OF
VARIOUS
P.C
BOARDS
oveseseeececeecssesesessseesereseneeneeesenseseseseseeseneaesnsg
eee
ciesenenenees
1.
RELATION
OF
P.C
BOARD
TITLE
AND
NUMBER
...s...eeccecsccsssesssesteeeeeeteetecnseecssennses
oe
eeersnersnenes
2.
COMPOSITION
OF
VARIOUS
P.C
BOARDS
.
0...
ce
cceeceesececereeesseesesseecssessaersseecesaeesneneneeaessanesseaees
SN
AARwWH
<<
For
basic
adjustments,
measuring
methods,
and
operating
principles,
refer
to
GENERAL
OPERATING
PRINCIPLES
AND
ADJUSTMENTS.
|
|
|
|
|
|
|
1.
SPECIFICATIONS
ee
ee
AEN
NESE
IRIINSONES
An
asterisk
next
to
a
figure
indicates
the
minimum
guaranteed
performance.
TRACK
SYSTEM
TAPE
SPEED
WOW
AND
FLUTER
TOTAL
WOW
AND
FLUTTER
FREQUENCY
RESPONSE
HARMONIC
DISTORTION
TOTAL
HARMONIC
DISTORTION
4
track
2
channel
stereo/monaural
system
7-1/2
and
3-3/4
ips
+0.7%
*7-1/2
ips
(19
cm/sec)
+0.8%
*3-3/4
ips
(9.5
cm/sec)
+1.0%
“Less
than
0.06%
WRMS
at
7-1/2
ips
Less
than
0.09%
WRMS
at
7-3/4
ips
*Less
than
0.1%
RMS
at
7-1/2
ips
(FWD/REV)
*Less
than
0.15%
RMS
at
3-3/4
ips
(FWD/REV)
*Less
than
0.1%
at
7-1/2
ips
(FWD/REV)
*Less
than
0.15%
at
3-3/4
ips
(FWD/REV)
30
to
25,000
Hz
+3
dB
at
7-1/2
ips
30
to
19,000
Hz
+3
dB
at
3-3/4
ips
(Using
AKAI
LN-150-7
tape)
*30
to
22,000
Hz
+3
dB
at
7-1/2
ips
*30
to
18,000
Hz
+3
dB
at
3-3/4
ips
Less
than
0.5%
*Less
than
1.0%
at
7-1/2
ips
*Less
than
2.0%
at
3-3/4
ips
SIGNAL
TO
NOISE
RATIO
*Better
than
50
dB
TOTAL
SIGNAL
TO
NOISE
RATIO
*Better
than
47
dB
OUTPUT
LINE
*0.775V
(0
dBm
+1.0
dB/0
dBm
+1.5
dB,
FWD/REV)
DIN
0.5V
PHONE
30
mV/8
ohm
At
playback
of
a
700
Hz
“0”
VU
pre-recorded
test
tape.
(Output
Volume
at
maximum)
INPUT
MIC
More
than
0.25
mV/5
k
ohm
LINE
More
than
70
mV/150k
ohm
DIN
More
than
3
mV
At
“0”
VU
output.
(Recording
Volume
at,
maximum)
RECORDING/PLA
YBACK
LEVEL
*0.775V
(0
dBm
+1.5
dB)
FWD/REV
deviation:
+1.5
dB
CROSS
TALK
Better
than
40
dB,
stereo
Better
than
55
dB,
monaural
ERASE
RATIO
Better
than
70
dB
BIAS
FREQUENCY
103
kHz
+5%
BIAS
LEAK
Better
than
~30
dB
HIGH
FREQUENCY
DEVIATION
Between
FWD
playback
channels:
within
3
dB
Between
REV
playback
channels:
within
4
dB
Between
FWD
and
REV:
within
3.5
dB
At
playback
of
an
8,000
Hz
3-3/4
ips
pre-recorded
test
tape
at
7-1/2
ips
RECORDING
TIME
90
min
stereo
recording
at
7-1/2
ips,
using
a
1,800
ft
tape
F.FWD
AND
RWD
TIME
Approximately
120
sec
at
50
Hz,
using
a
1,800
ft
tape
MOTOR
MAIN
MOTOR
2
speed
AC
servo
control
outer
rotor
motor
Type:
SCM2-24KJ
4
pole
Revolutions:
615
rpm
at
7-1/2
ips
(19
cm/sec)
307.5
rpm
at
3-3/4
ips
(9.5
cm/sec)
REEL
MOTOR
Two
6
pole
eddy
current
outer
roter
motors
Type:
24XO-MR
Revolutions:
930
rpm
at
50
Hz
1,120
rpm
at
60
Hz
rR
HEAD
RECORDING/ERASE
COMBINATION
HEAD
PLAYBACK
HEAD
REVERSING
TIME
TRANSISTOR
DIODE
POWER
REQUIREMENTS
AND
CONSUMPTION
DIMENSIONS
WEIGHT
Type:
RE4-6
Gap:
REC
HEAD;
4
microns
ERASE
HEAD;
double
gap
Impedance:
REC
HEAD;
1,400
ohm
+25%
at
100
kHz
ERASE
HEAD;
130
ohm
£7%
at
100
kHz
DC
Resistance:
REC
HEAD;
5.5
ohm
ERASE
HEAD;
1.8
ohm
Type:
P4-202
Gap:
1.7
+0.5
microns
Impedance:
1,400
ohm
at
1
kHz
DC
Resistance:
268
ohm
5
to
6
sec
at
7-1/2
ips
(muting
interval)
2S8A564(Q)(R)...
1
28C1211(D)(E)
...
2SC458LG(C)...
14
2SD361(D1)(D2)
....
28C945
(P)(Q)(R)
.
..
18
TIP48....1
2SC945L(Q)(R)
....
1
1N34A...2
182473VE...
6
1N4001...
4
10D2...4
1N4003....5
10D4...1
181588
...1
RDSAM)...1
182473...1
100
to
240V
AC
50/60
Hz,
90W
(Universal
models)
240V
AC
50
Hz,
90W
(BSI
Models)
220V
AC
50
Hz,
90W
(CEE
Models)
120V
AC
60
Hz,
90W
(CSA
Models)
100V
AC
50/60
Hz,
60/65W
(JPN
Models)
440(W)x404(H)x208(D)
mm
(17.3"15.9"x8.2"")
Dimensions
include
all
protruding
parts,
16.6
kg
(36.5
Ibs)
NOTE:
1.
Specifications
determined
with
SCOTCH
#211
tape
unless
otherwise
noted.
2.
Specifications
subject
to
change
without
notice.
ll.
DISMANTLING
OF
UNIT
In
case
of
trouble,
etc.
necessitating
disassembly,
please
disassemble
in
the
order
shown
in
photographs.
Reassemble
in
reverse
order.
NOC
SL GU GT
GT
GT
AT
GU GT
GU
GIG
GI BI
GL
GI
BE
GI
SIS
nC
ST
GT
gl
GU GU
Gl
gl
gl
gl
gi
ge
Gl
Gl
Ua
GT
ESE
SF
iy
a
Gi
4
5
8
ty
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21
G
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5
¢
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ty
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2
G
»
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wy
h,
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elk
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ty
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( a
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MECH./AMP.
BLOCK
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CONTROL
KNOBS
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CASE
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CTRL
LCT
LeeLee
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PBR
PER
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TET
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FRONT
PANEL
4
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»
y
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fn
Da
ayPs
ee
PgyPT
YT
YSIS
TY
TPT
TEST
TT
TEL SER
TTT
Pa
aePe
ENTE
OTTO
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EP
TEL
TT
TRUE
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ELD
TR
Cd
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¢
¢
ty)
8
e
'
e
°
‘
¢
i.
8
a
La
=
PVP
GIGI
GI
GI
GU
GUI
GUI
GI
GU
Gu
gw
PP
LPP
LP
DIP
RID
LaevgTgugugugug’
SCREWS
2
Z.
<P.
LET
eRe
LE
EEL
TT
LT
LZ
MECH.
BLOCK
DatqgTgwtglgw.
Prd
>)
a
P.
Pe.
glgug
Tee
hie
hai,
ses
ie
a
il.
ARRANGMENT
OF
PRINCIPAL
PARTS
PLAY HOLD
MICRO
SWITCH
SWI
QT
MICRO
SWITCH
SW-I6
BRAKE
SOLENOID
SL-2
REC
MICRO
SWITCH
SW-5
PINCH
WHEEL
SOLENOID
BRAKE
SOLENOID
MICRO
MICRO
SWITCH
SW-9
SWITCH
SW-8
REEL
MOTOR
MICRO
SWITCH
Sw-!8
PINCH
WHEEL
SOLENOID
SL-3
REVERSE
SOLENOID
SL-I
REVERSE
SOLENOID
MICRO
SWITCH
SW~7
HEAD
BLOCK
MICRO
SWITCH
SW-6
&
SW-I9
PAUSE
MICRO
SWITCH
SW-i0
PAUSE
LEVER
TENSION
MICRO
SWITCH
SW-14
TAPE
SPEED
SW-2
&
SW-3
POWER
SW-I
PUSH
BUTTON
MONITOR
SW-2
TAPE
SELECTOR
SW-|
RIGHT
REEL
MOTOR
LEFT REEL
MOTOR
24X0-MR
RESISTOR
P.C
BOARD
NE-l046
POWER
TRANSFORMER
NET-
|
POWER
SUPPLY
PC
BOARD
NE-1048
SERVO
CONTROL
P.C
BOARD
MY-
2036
OPERATION
SWITCH
BLOCK
MAIN
MOTOR
SCM2
-24KJ
SA
RC
BOARD
NE-2034
EQUALIZER
SWITCH
RC
BOARD
NE-5038
REC
AMP
RC
BOARD
P.B
AMP
RC
BOARD
NE-5037
NE-5036
IV.
MECHANISM
ADJUSTMENT
REC
MICRO
SWITCH
Ssw-5
PINCH
WHEEL
¥
SOLENOID
SL~3
PINCH
WHEEL
PINCH
WHEEL
PRESSURE
ADJUSTMENT
NUT
1.3
to
1.4
kg
P
PLUNGER
LEVER
PINCH
WHEEL
SOLENOID
MICRO
SWITCH
SW-9
(A)
.
POSITION
ADJUSTMENT
OF
PINCH
WHEEL
SOLENOID
SL-3
(Refer
to
Fig.
1)
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.
2).
3)
Set
the
deck
to
playback
mode
and
fix
Pinch
Wheel
Solenoid
at
position
at
which
the
pinch
wheel
begins
to
rotate.
.
PINCH
WHEEL
POSITION
ADJUSTMENT
AT
STOP
MODE
(Refer
to
Fig.
3)
1)
Remove
head
block.
2)
Adjust
Stopper
so
that
the
clearance
between
Pinch
Wheel
and
Capstan
Shaft
is
9.5
mm.
.
PINCH
WHEEL
PRESSURE
ADJUSTMENT
(Refer
to
Fig.
2)
Adjust
Pinch
Wheel
Pressure
Adjustment
Nut
so
that
pinch
wheel
pressure
is
1.3
to
1.4
kg.
.
POSITION
ADJUSTMENT
OF
PLAY
HOLD
MICROSWITCH
SW-11
(Refer
to
Fig.
3)
Adjust
Play
Hold
Microswitch
position
so
that
at
stop
mode,
the
Play
Hold
Microswitch
operates
properly
and
the
Slide
does
not
contact
the
body
of
the
microswitch.
QT
MICRO
SWITCH
SW-I6
QUICK
PLATE
CAPSTAN
Fig.
3
5.
SLIDE
ADJUSTMENT
(Refer
to
Fig.
3)
Adjust
part
(A)
of
the
Slide
so
that
at
stop
mode,
the
Pinch
Wheel
Solenoid
Microswitch
operates
properly,
and
part
(A)
does
not
strongly
hit
against
the
body
of
the
microswitch.
.
POSITION
ADJUSTMENT
OF
QUICK
PLATE
(Refe
to
Fig.
3)
Adjust
Quick
Plate
position
so
that
at
stop
mode,
the
Quick
Tension
Microswitch
operates
properly,
and
the
Quick
Plate
does
not
strongly
hit
against
the
body
of
the
microswitch.
.
POSITION
ADJUSTMENT
OF
RECORDING
MICROSWITCH
SW-S
(Refer
to
Fig.
1)
Adjust
part
(A)
of
the
Slide
so
that
at
playback
mode
the
Recording
Microswitch
operates
properly,
and
part
(A)
does
not
contact
the
body
of
the
micro-
switch.