Akai GX-630D User manual
SEAM
AKAI
STEREO
30D
DEC
moos
G>
-_
(-630
AKAI
STEREO
TAPE
DECK
mopeL
GX-630D
ALSO
APPLICABLE
TO
MODEL
GX-630DB
STEREO
TAPE
DECK
SECTION
1
SERVICE
MANUAL
............
0.
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1
SECTION
2
PARTS
LIST
...........
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cece
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25
I.
SPECIFICATIONS
0.0.0...
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en
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2
Il.
DISMANTLING
OF
UNIT
......
0.000
ee
ee
en
ee
es
4
Ill.
ARRANGEMENT
OF
PRINCIPAL
PARTS
........
0.0
eee
ee
eee
ett
ees
5
IV.
MECHANISM
ADJUSTMENT
........
2.000
e
eee
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ee
ees
6
1.
POSITION
ADJUSTMENT
OF
BRAKE
SOLENOID
SL-2
...
2...
eee
es
6
2.
BRAKE
TENSION
ADJUSTMENT
....
0.00.
ee
6
3.
POSITION
ADJUSTMENT
OF
PINCH
ROLLER
SOLENOID
SL-1
........---
+++
eee
uee
7
4,
PINCH
ROLLER
PRESSURE
ADJUSTMENT
.....
0...
00
eee
tee
7
5.
CAPSTAN
SHAFT
LOOSE
PLAY
ADJUSTMENT
.......---
0
eee
eee
eee
ees
q
6.
IMPEDANCE
ROLLER
LOOSE
PLAY
ADJUSTMENT
.....
16...
.
eee
eee
eee
ees
7
7.
TAPE
GUIDE
HEIGHT
ADJUSTMENT
......-
2.
eee
ee
es
8
8.
REEL
TABLE
HEIGHT
ADJUSTMENT
.....
0.2.6
ee
eee
es
9
9.
INSTALLATION
POSITION
ADJUSTMENT
OF
JOINT
B....
6...
eee
ees
9
V.
HEAD
ADJUSTMENT
.........
0-0
cee
eee
ee
ee
eee
ee
nee
10
VI.
AMPLIFIER
SYSTEM
ADJUSTMENT
...... 2.2.2.
eee
eee
eee
tens
2
1.
D.C
POWER
SUPPLY
VOLTAGE
ADJUSTMENT
......---
00
ee
eters
2
2.
TAPE
SPEED
ADJUSTMENT
.....
2...
ee
es
ip)
3.
RECORDING
AND
PLAYBACK
AMPLIFIER
ADJUSTMENT
(GX-630D)
.........-.----
B
4.
RECORDING
AND
PLAYBACK
AMPLIFIER
ADJUSTMENT
(GX-630DB)
...........---
4
5.
DOLBY
NOISE
REDUCTION
ADJUSTMENT
(GX-630DB)
....
6.6...
sere
e
eee
5
VII.
D.C
RESISTANCE
OF
VARIOUS
COILS
..
1...
2...
ee
ee
es
6
VIII.
CLASSIFICATIONS
OF
VARIOUS
P.C
BOARDS
.....
2.2...
0
cece
7
1.
P.C
BOARD
INTERCHANGEABILITY
CHART
....
0.2...
ee
ees
7
2.
COMPOSITE
VIEWS
OF
VARIOUS
P.C
BOARD
....
2-6-0
2
7
SECTION
1
SERVICE
MANUAL
TABLE
OF
CONTENTS
For
basic
adjustments,
measuring
methods,
and
operating
principles,
refer
to
GENERAL
OPERAT-
ING
PRINCIPLES
AND
ADJUSTMENTS.
|
SPECIFICATIONS
An
asterisk
next
to
a
figure
indicates
the
minimum
guaranteed
performance.
TRACK
SYSTEM
4
track
2
channel
stereo/monaural
system
TEPE
SPEED
7-1/2
and
3-3/4
ips
+0.7%
*7-1/2
and
3-3/4
ips
+1.0/—1.5%
WOW
AND
FLUTTER
Less
than
0.06%
WRMS
at
7-1/2
ips
Less
than
0.09%
WRMS
at
3-3/4
ips
*Less
than
0.10%
RMS
at
7-1/2
ips
*Less
than
0.15%
RMS
at
3-3/4
ips
TOTAL
WOW
AND
FLUTTER
*Less
than
0.12%
RMS
at
7-1/2
ips
*Less
than
0.18%
RMS
at
3-3/4
ips
FREQUENCY
RESPONSE
30
to
25,000
Hz
+3
dB
at
7-1/2
ips
30
to
19,000
Hz
+3
dB
at
3-3/4
ips
(with
AKAI
LN-150-7
Tape)
|
*30
to
22,000
Hz
+3
dB
at
7-1/2
ips
i
*30
to
18,000
Hz
+3
dB
at
3-3/4
ips
HARMONIC
DISTORTION
Less
than
0.5%
TOTAL
HARMONIC
DISTORTION
al
*Less
than
1.5%
SIGNAL
TO
NOISF
RATIO
Better
than
50
dB
TOTAL
SIGNAL
TO
NOISE
RATIO
*Better
than
47
dB
|
*0.775V
(0
dBm
+1.0
dB)
30
mV
at
8
ohm
At
playback
of
a
700
Hz
“0”
VU
pre-recorded
test
tape.
|
(Output
Volume
at
maximum)
OUTPUT
LINE
HEADPHONE
INPUT
MIC
LINE
DIN
INPUT/OUTPUT
RECORDING/PLAYBACK
LEVEL
CROSS
TALK
ERASE
RATIO
RECORDING
BIAS
FREQUENCY
BIAS
LEAK
-
HIGH
FREQUENCY
DEVIATION
More
than
0.25
mV/10
k
ohm
More
than
70
mV/150
k
ohm
At
“0”
VU
output.
(Recording
Volume
at
maximum)
0.25
mV/0.5V
*0.775V
(0
dBm
+1.5
dB)
Better
than
45
dB,
stereo
Better
than
55
dB,
monaural
Bec
RECORDING
TIME
|
Better
than
70
dB
100
kHz
+5%
Better
than
—30
dB
(GX-630D)
Better
than
—50
dB
(GX-630DB)
Within
3
dB
At
playback
of
an
8,000
Hz
3-3/4
ips
pre-recorded
tape
at
7-1/2
ips
180
min
stereo
recording
at
7-1/2
ips,
using
a
3,600
ft
tape.
F.FWD
AND
RWD
TIME
Approximately
2
min
and
40
sec
at
50
Hz,
using
a
3,600
ft
tape.
MOTOR
MAIN
MOTOR
REEL
MOTOR
2
speed
AC
servo
control
outer
rotor
motor
Type:
SCM2-24K]J
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)
6
pole
eddy
current
outer-rotor
motor
|
Type:
24X0-TD
Revolutions:
930
rpm
at
50
Hz
1,120
rpm
at
60
Hz
HEAD
ERASE
HEAD
RECORDING
HEAD
PLAYBACK
HEAD
Type:
E4-260
Gap:
double
gap
Impedance:
210
ohm
+10%
at
100
kHz
D.C
Resistance:
2
ohm
Type:
R4-200
Gap:
4
micron
Impedance:
1,870
ohm
at
100
kHz
|
D.C
Resistance:
8
ohm
_
Type:
P4-202
;
Gap:
1.7
+0.5
micron
!
Impedance:
1,400
ohm
at
1
kHz
D.C
Resistance:
268
ohm
TRANSISTOR
&
FET
2SA564(Q)(R)
.
.
.
1(5)
2SC1247A(B)(Y)
..
.
2(2)
2SC458(C)
..
.
0(12)
2SD361(D;)(D2)
...
1(1)
2SC458LG(C)
.
.
.
16(32)
TIP47
...1(1)
2SC711(F)(G)
..
.
2(2)
2SK30A(GR)
.
.
.
0(4)
2SC945L(Q)(P)
.
. .
22(22)
DIODE
1N34A
...
2(6)
10D2...4(4)
1N4001...
4(4)
WZ075
..
.
2(2)
1N4004
..
.
6(6)
WZ08S5
..
.
0(4)
181588...
11)
WZ192...10)
182473...
21(21)
RDSA(M)
..
.
1(1)
182473VE
...
16(28)
POWER
REQUIREMENT
AND
CONSUMPTION
100
to
240V
AC
50/60
Hz,
90W
(Universal
Models)
220V
AC
50
Hz,
100W
(CEE
Models)
120V
AC
60
Hz,
90W
(CSA
Models)
100V
AC
50/60
Hz,
70W
(JPN
Models)
ee
DIMENSIONS
465(H)
x
440(W)
x
240(D)
mm
(18.3”
x
17.4”
x
9.4”)
Dimensions
include
all
protruding
parts.
WEIGHT
GX630D:
19
kg
(41.8
Ibs)
GX-630DB:
19.5
kg
(42.9
Ibs)
NOTES:
1.
Specifications
determined
with
SCOTCH
#211
Tape
unless
otherwise
noted.
2.
Specifications
subject
to
change
without
notice.
3.
The
numbers
shown
in
parentheses
in
Items
TRANSISTOR
&
FET
and
DIODE
are
applicable
to
Model
GX-630DB.
li
DISMANTLING
OF
UNIT
In
case
of
trouble,
etc.
necessitating
disassembly,
please
disassemble
in
the
order
shown
in
photographs.
Reassemble
in
reverse
order.
r
bo
SCREWS
li!
ARRANGEMENT
OF
PRINCIPAL
PARTS
RR
BRAKE
HOLD
MICRO
SWITCH
SW-8,
SW-9
BRAKE
SOLENOID
SL-2
PINCH
ROLLOR
SOLENOID
SL!
|'MPEDANCE
ROLLER
HEAD
BLOCK
TENSION
MICRO
REEL
SIZE
SW-3
SWITCH
SW-7
TAPE
SPEED
SW-2
PAUSE
MICRO
SWITCH
sw-5
POWER
SW-!
REEL
SIZE
SW-4
PUSH
BUTTON
MONITOR
SW-!
PAUSE
MICRO
SWITCH
Ssw-6
RIGHT
REEL
MOTOR
24X0-TD
LEFT
REEL
MOTOR
24xX0-
TD
srmaseen
SERVO
PC
BOARD
My
Obes
RELAY
RC
BOARD
TE-2002
MAIN
MOTOR
SCM2-24KJ
SYS-CON
P.C_BOARD
TE-
200!
PB
AMP
RC
BOARD
REC
AMP
P.C
BOARD
MY
-5016
MY-
5017
IV
MECHANISM
ADJUSTMENT
SPRING
RACK
MICRO
SWITCH
SW-8,
SW-9
BRAKE
LEVER
SPRING
BRAKE
BAND
LEVER
ced
~
“a
RA
BRAKE
LEVER
B
Gaal
Sealy
ae
BRAKE
SOLENOID
SL~-2
|
|
BRAKE
BAND
LEVER
BRAKE
BAND
SUPPORT
BRAKE
BAND
SUPPORT
Y
BS
BRAKE
LEVER
A
Fig.
1
BRAKE
DRUM
BRAKE
BAND
GUIDE
BRAKE
LEVER
CLOTH
TAPE
BRAKE
BAND
BRAKE
BAND
GUIDE
Fig.
2
1.
POSITION
ADJUSTMENT
OF
BRAKE
SOLENOID
SL-2
(Refer
to
Figs.
1,
2)
1)
Adjust
left/right
Brake
Band
Support
positions
so
that
at
stop
mode,
Brake
Lever
A
and
Brake
Lever
B
display
180°
angle
relativity.
2)
Under
the
conditions
described
in
1)
above,
adjust
installation
angle
position
of
Microswitches
SW-8
and
SW-9
so
that
the
clearance
between
the
brake
-
lever
and
brake
band
lever
is
1.5
mm.
3)
Adjust
installation
position
of
the
Brake
Solenoid
so
that
at
playback
mode,
the
brake
band
sepa-
rates
from
the
brake
drum.
2.
BRAKE
TENSION
ADJUSTMENT
(Refer
to
Figs.
1,
2)
1)
Adjust
installation
position
of
the
Spring
Rack
so
that
brake
tension
is
500g.
2)
After
brake
tension
adjustment,
adjust
installation
position
of
the
Brake
Band
Guide
so
that
at
all
modes
except
stop
mode,
the
brake
band
com-
pletely
separates
from
the
cloth
tape
on
the
brake
drum.
PINCH
ROLLER
SOLENOID
SL—I
PLUNGER
PULL
BAR
PINCH
ROLLER
PRESSURE
ADJUSTMENT
NUT
1.4Kg
PINCH
ROLLER
Fig.
3
3.
POSITION
ADJUSTMENT
OF
PINCH
ROLLER
SOLENOID
SL-!
(Refer
to
Fig.
3)
1)
Insert
a
4
mm
thickness
gauge
(A
U
type
washer
can
be
substituted)
between
the
Pull
Bar
and
Pinch
Roller
Arm.
SQ
2)
Set
the
deck
to
playback
mode,
and
fix
Pinch
Roller
Solenoid
at
position
at
which
pinch
roller
begins
to
rotate.
THRUST
SUPPORT
ANGLE
4.PINCH
ROLLER
PRESSURE
ADJUST-
MENT
(Refer
to
Fig.
3)
Adjust
Pinch
Roller
Pressure
Adjustment
Nut
so
that
pinch
roller
pressure
is
1.4
kg.
NOTE:
To
measure
pinch
roller
pressure,
pull
the
pinch
roller
away
from
capstan
with
a
spring
gauge
and
gently
return.
Spring
Gauge
indi-
cation,
at
the
time
the
pinch
roller
contacts
the
capstan
and
the
capstan
begins
to
rotate,
should
be
1.4
kg.
CAPSTAN
SHAFT
Fig.
4
5.
CAPSTAN
SHAFT
LOOSE
PLAY
ADJUST-
MENT
(Refer
to
Fig.
4)
Adjust
to
obtain
a
clearance
of
0.1
mm
between
the
Capstan
Shaft
and
Thrust
Support
Angle.
IMPEDANCE
ROLLER
6.
IMPEDANCE
ROLLER
LOOSE
PLAY
AD-
Fig.
5
JUSTMENT
(Refer
to
Fig.
5)
Adjust
Screws
A
and
B
so
that
impedance
roller
loose
play
is
0.1
mm.
NOTE:
Confirm
that
the
screws
are
tight
following
this
adjustment.
TAPE
GUIDE
TAPE
TENSION
ARM
ADJUSTMENT
WASHER
ADJUSTMENT
WASHER
Wy)
%
LOWER
THE
GUIDE
DOWN
A
LITTLE
%
LIFT
THE
GUIDE
UP
A
LITTLE
Fig.
6
TAPE
GUIDE
ADJUSTMENT
WASHER
0.!/t
Qh
hndkiddficlhih
(LL
Lhe
Na
Fig.
7
7.
TAPE
GUIDE
HEIGHT
ADJUSTMENT
(Refer
to
Figs.
6.
7)
;
Adjust
tape
guide
height
so
that
the
tape
does
not
curl
between
the
tape
guide
and
guides
on
head
base.
NOTE:
As
left
and
right
tape
guide
height
adjust-
ment
methods
are
different.
be
sure
to
refer
to
Figs.
6,
and
7.
[
ele
FIXATION
SCREW
—REEL
TABLE
TAPE
‘
ee,
TAPE
SPEED
--
3-3/4
!
7-1/2
8.
REEL
TABLE
HEIGHT
ADJUSTMENT
(Refer
to
Fig.
8)
Load
a
tape
and
adjust
reel
table
height
so
that
at
both
F.FWD
and
RWD
modes,
the
tape
winds
on
the
center
of
the
reel
hub.
NOTE:
Tape
should
wind
on
center
of
reel
hub
regardless
of
type
reel
used.
REEL
Fig.
8
Fig.
9
INSTALLATION
POSITION
ADJUSTMENT
OF
JOINT
B
(Refer
to
Fig.
9)
Adjust
installation
position
of
Joint
B
so
that
wv
hen
tape
speed
is
changed,
Slide
Switch
SW-2
and
Equalizer
Change
Slide
Switch
SW-2
mounted
a
the
amplifier
front
chassis
display
link-motion
for
po»per
switching.
V
HEAD
ADJUSTMENT
NOTES:
1.
nm
BW
NN
=a
ge
Gis
=
il
:
aes
ERASE
HEAD
RECORDING
HEAD
PLAYBACK
HEAD
E4-
260
R4~
200
P4-202
Fig.
10
As
perfect
head
adjustments
are
vital
to
tape
deck
performance,
be
sure
that
these
adjustments
are
carriec]
out
properly.
.
Be
careful
not
to
use
a
magnetized
driver
or
other
magnetized
tools
in
the
vicinity
of
the
heads.
.
Use
only
new
tape
as
level
variation
is
likely
to
occur
when
using
old
tape.
.
Demagnetize
heads
with
head
demagnetizer
before
and
after
head
adjustment.
.
Set
tape
speed
to
7-1/2
ips
except
in
steps
7
and
8.
|
.
Refer
to
Fig.
10.
.
Test
Tape
Adjustment
|
Step
Adjustment
Item
Supply
Sienal
MODE
|
Paint
Remarks
i
|
Tape
Guide
Tape
Guide
height
:
Height
Adjust
so
that
tape
does
not
twist
oO
al
PLAY
pee
Adjustment
pyoe
Ee
Adjustment
between
tape
guides
on
head
base.
Nut
|
|
:
Erase
Head
E
Upper
edge
of
channel
1
head
core
is
0.1
Optional
AY
7
Height
Adjustment
pene
Ee
|
(A)(BYC)
mm
higher
than
upper
edge
of
tape.
:
1
{
|
Recording
Head
F
|
Upper
edges
of
channel
1
head
core
and
:
Opt
1
PLAY
:
|
4
Height
Adjustment
sata
|
E
:
(DMEMF)
tape
are
the
same
height.
=
ih
po
1
Playback
Head
‘
Upper
edges
of
channel
1
head
core
and
Oo
1
PLAY
€
Height
Adjustment
pon
*
GAO
tape
are
the
same
height.
-
—
Playback
Head
8,000
Hz
3-3/4
;
5
Azimuth
Alignment
ios
T
i
/
PLAY
(D
Maximum
output,
both
channels.
Adjustment
IPR
E
RSE
HAD
:
a
Playback
Head
|
8.000
Hz
3-3/4
i
Adjust
head
gap
surface
so
that
there
is
6
Gap
Alignment
ips
Test
Tape
|
PLAY
|
(K)
no
change
in
output
level
when
tension
Adjustment
is
applied
to
the
supply
reel
side.
|
|
Recording
Head
=|
SCOTCH
#211
Tape
|
;
f
pe
:
7
seen
ee
15,000
Hz
~20
dBm
REC
(F)
Maximum
output,
both
channels.
ustmen
!
ssl
Hs
Recording
Head
SCOTCH
#211 Tape
Adjust
head
gap
surface
so
that
there
is
|
:
REC
|
(J)
no
change
in
output
level
when
tension
,
8
Gap
Alignment
15,000
Hz
—20
dBm
Adjustment
is
applied
to
the
supply
reel
side.
_i___
Chart
1
i]
Vi
AMPLIFIER
SYSTEM
ADJUSTMENT
1.D.C
POWER
SUPPLY
VOLTAGE
ADJUSTMENT
(Refer
to
Fig.
11)
lee
Fig.
11
ADJUST
TO
+1.0
VR-1
1OKB
7-I/2ips
-1.5
%
+10
:
VR-2 30KB
3-3/4ips
-15%
oe!
SERVO
RC
BOARD
MY-2036
Fig.
12
12
3.RECORDING
AND
PLAYBACK
AMPLIFIER
ADJUSTMENT
(Model
GX-630D)
(Refer
to
Fig.
13)
VR=|
VR-3
—-
VR~3b VR=Ib
50KB
2KB 2KB
50KB
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PC
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VR-2
VR-2b
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AMP
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BOARD
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Fig.
13
SRT
PC
BOARD
TD-520!
Fig.
14
13
4.
RECORDING
AND
PLAYBACK
(Refer
to
Figs.
13,
1
Step
Adjustment
Item
4)
Test
Tape
Supply
Signal
Bias
Leak
aS
ee
ole
Dolby
Noise
Reduction
Adjustment
Mode
Adjustment
Point
23
mH
Less
than
—50
VU
at
monaural.
;
Test
Tape
Adjustment
S
tep
|
Adjustment
Item
Supply
Signal
Mode
Point
Result
Remarks
1
Playback
Level
700
Hz
7-1/2
ips
PLAY
VR-1
0+1.5
dB
Adjustment
0
VU
Test
Tape
50
kB
(0.775V)
at
VU
Meter
‘
2
Sensitivity
thee
ey
es
PLAY
poe
0
vu
Adjustment
est
Tape
sd
3
|
Recording
Level
sepa
eS
a
VR-2
021.5
dB
|
Adjustment
recording
10
kB
(0.775V)
Piaqueney
SCOTCH
#211
Tape
1,000
Hz
4
Response
1,000
Hz
REC
C-25
to
Tape
Speed
3-3/4
ips.
Adjustment
10,000
Hz
80P
10,000
Hz
Recheck
recording
level.
J
-
—20
VU
recording
flat
5
Bias
Leak
REC
Less
than
Less
than
—20
VU
-30
VU
Chart
2
AMPLIFIER
ADJUSTMENT
(Model
GX-630DB)
1
Playback
Level
700
Hz
7-1/2
ips
PLAY
VR-1
0
+1.0
dB
Adjustment
0
VU
Test
Tape
50
kB
(0.775V)
VU
Meter
700
Hz
7-1/2
ips
VR-3
Sensitivity
0
VU
Test
Tape
PLAY
0VU
2
p
2
kB
Adjustment
5
|
Recording
Level
SCOTCH
#211
Tape
:
3
Adjustment
1,000
Hz
REC
Net
:
ae
(Low
Noise
Tape)
0
VU
recording
.
Recording
Level
AKAI
LN-150-7
:
4
Adjustment
Tape
1,000
Hz
REC
Nes
a
ae
-
(Wide
Range
Tape)
0
VU
recording
:
Prequene
SCOTCH
#211
Tape
1,000
Hz
5
os
aa
1,000
Hz
REC
C-25
to
Tape
Speed
3-3/4
ips.
ia
tne
10,000
Hz
80P
10,000
Hz
|
Recheck
recording
level
eae
—20
VU
recording
flat
Refer
to
Item
V-5
below.
ons
Chart
3
NOTES:
1)
Set
tape
speed
to
3-3/4
ips
for
frequency
response
adjustment
and
to
7-1/2
ips
for
all
other
adjustments.
2)
Set
Tape
Selector
to
‘““LOW
NOISE”
except
where
otherwise
noted.
3)
Set
Monitor
Switch
to
“TAPE”
except
where
otherwise
noted.
4)
Output
Volume
at
maximum.
5)
New
test
tape
should
be
used.
6)
The
letter
b
following
an
adjustment
part
number
indicated
“Right
Channel”.
14
Dal
D)
RIGHT
CHANNEL
©
Oo
TesT
©
o——
POINT
oO
O
VR2b
SKBN=
VRib
IKB
VR
IKB
Y=
VR2
5KB
o*
T.P
m=)
§
©
ak
@=
Gk:
Gk
LEFT
CHANNEL
DOLBY
NR
PC
BOARD
TD-530!
5.DOLBY
NOISE
REDUCTION
ADJUST-
MENT
(Model
GX-630DB)
(Refer
to
Fig.
15)
PART-1.
RECORDING
DOLBY
N.R
CIRCUIT
ADJUSTMENT
Disconnect
the
wire
connected
to
Dolby
circuit
input
and
output
terminals
(A)
and
(B).
Connect
an
Audio
frequency
oscillator
to
terminal
(A)
and
connect
a
High-sensitivity
VTVM
to
terminal
(B).
1)
Turn
semi-fixed
resistors
VR1
1kB
and
VR2
5
kB
fully
clockwise
(Fig.
15).
2)
Ground
test
points
T.P
(Fig.
15)
3)
Set
Dolby
Switch
to
OFF
position.
4)
Supply
a
5
kHz,
—10
dBm
signal
which
has
been
verified
with
a
frequency
counter
from
the
audio
frequency
oscillator
and
confirm
that
at
this
time
the
indication
of
the
high-sensitivity
VTVM
con-
nected
to
terminal
(B)
is
0
dBm.
5)
Reduce
the
output
of
the
audio
frequency
oscil-
lator
by
—30.5
dB
from
the
condition
outlined
in
item
1-4)
(5
kHz,
—40.5
dB)
and
at
this
time
confirm
that
the
indication
of
the
high-sensitivity
VTVM
connected
to
terminal
(B)
is
—30.5
dB.
6)
Set
Dolby
Switch
to
ON
position
and
adjust
semi-fixed
resistor
VR1
1
kB
to
obtain
a
—20.5
dBm
indication
on
the
high-sensitivity
VTVM
connected
terminal
(B).
7)
Disconnect
ground
wire
from
test
point
T.P
(grounded
in
item
1—2)
and
at
this
time
adjust
semi-fixed
resistor
VR2
5
kB
to
obtain
a
—22.5
dBm
indication
on
the
high-sensitivity
VTVM
connected
to
terminal
(B).
Fig.
15
NOTE:
Identical
P.C
Boards
are
utilized
for
Record-
ing
Dolby
N.R
and
Playback
Dolby
N.R
The
Recording
Dolby
N.R
P.C
Board
is
located
on
the
Recording
Amp
P.C
Board
and
the
Playback
Dolby
N.R
P.C
Beard
is
located
on
the
Playback
Amp
P.C
Board,
Adjust
left
and
right
channels
respectively.
PART-2.
PLAYBACK
DOLBY
N.R
CIRCUIT
ADJUSTMENT
This
adjustment
is
carried
out
in
essentially
the
same
way
as
the
recording
Dolby
circuit
adjustment-
Disconnect
the
wire
connected
to
input
and
out
put
terminals(A’)
and
(B),
connect
and
audio
frequency
oscillator
to
terminal(A’),
and
connect
a
high-sensi-
tivity
VTVM
to
terminal(B).
Turn
semi-fixed
resistor
VR1
1
kB
and
VR2
S
kB
fully
clockw
ites
and
jround
test
points
T.P.
1)
Set
Dolby
Switch
to
OFF
position
and
supply
a5
kHz,
10
dBm
signal
which
has
bcen
verified
with
a
frequency
counter
from
the
audio
frequency
oscillator,
Confirm
that
the
high-sensitivity
VTVM
indication
at
this
time
is
O
dBm.
Next,
lower
the
oscillator
output
by
—22.5
dB
and
confim
that
the
high-sensitivity
VTVM
indication
is
—21.5
dB.
2)
Set
Dolby
Switch
to
ON
position
and
at
ths
time
adjust
semi-fixed
resistor
VR1
1
kB
to
oltain
a
—32.5
dB
high-sensitivity
VTVM
indication.
Next,
disconnect
ground
wire
from
test
pots
T.P
and
adjust
semi-fixed
resistor
VR-2
5
kB
toob
tain
a
—30.5
dBm
indication.
Dolby
is
a
trademark
of
Dolby
Laboratories,
Inc.
Under
License
from
Dolby
Laboratories,
Inc.
15
Vil
D.C
RESISTANCE
OF
VARIOUS
COILS
Part
Main
Motor
Reel
Motor
Pinch
Roller
Solenoid
Brake
Solenoid
Relay
Relay
Relay
Headphone
Output
Transformer
Oscillator
Coil
Erase
Head
Recording
Head
Playback
Head
NOTE:
16
Designation
D.C
Resistance
Between
BLU-RED:
100
ohm
SCM2-24KJ
Between
YLW-GRN:
180
ohm
Pick-up
Coil:
635
ohm
et
-
:
72
78XO-10
Be
WRN
i
ee
700
ohn
1240
PHT3
900
ohm
MY4-02-US-24DC
700
ohm
|
LC1-C-J1DC-24V
1,150
ohm
|
TECK-36
1,000
ohm
Primary:
565
ohm
+
15%
NiIG298
Sesuny
0.95
ohm
+
io
Between
1
—
3
:
0.3
ohm
|
OT-204
Between
4
—
6
:
0.7
ohm
E4-260
Between
7
—
9
:
8.2
ohm
2.0
ohm
The
resistance
values
shown
in
this
chart
are
average
values.
268
ohm
Chart
4
Vill
CLASSIFICATIONS
OF
VARIOUS
P.C
BOARDS
1.
P.C
BOARD
INTERCHANGEABILITY
CHART
i
P.C
Board
GX-630D
a
GX630DB_
Sys
Con
P.C
Board
TE-2001
TE-2001
E
=s
4
mee
Relay
P.C
Board
TE-2002
TE-2002
|
Speed
Switch
P.C
Board
|
TE-5001
4
TE-5001
:
Rec
Mode
P.C
Board
TE-5003
=i
TE-5003
SRT
P.C’Board
*TD-5201
«|
*TD-5201
~
Dolby
P.C
Board
|
TD-53014ED.
)
Servo
P.C
Board
|
MY-2036
2ED
|
_MY-2036
2ED
Rec
&
Osc
Amp
P.C
Board
*MY50163ED
|
~~
*MY-5016
3ED
:
P.B
Amp
P.C
Board
‘2
MY-5017
2ED
‘ie
MY-50172ED.
-_
Transistor
P.C
Board
5
KJ-2049
_
KJ-2049
|
Jack
Plate
P.C
Board
i
LE-5622
L
LE-5622
|
Chart
5
NOTE:
*
Mark
not
interchangeable
2.
COMPOSITE
VIEWS
OF
VARIOUS
P.C
BOARDS
1)
CYSCON
P.C
BOARD
TE-2001
Z1S0-GAHB
EO
TO
REMOTE
ral
WHT
se
TO
REMOTE
OCKET
5
®
WHT
/DOT
_PRBC:::
:
ees
a
.
f
rasan
is
e
ons
enn
|
Cy
TO
TENSION
MICRO
GRY
sw-7
yuw
TO
REEL
SIZE
SW
—-4
‘/SHORT
BLK
ew)
TO
RELAY
Pi
pOAeRO
Wer
oor
aux
|
TE-2002
oan
Yow
Bd
tone
TO
MATE-N-LOCK
@)
AON
OX
To
REEL
SIZisw
—4
YLW/LONG
TO
MATE-N-LOCK
@
WHT
TO
REMOTE
ScKE-T
©
TO
RELAY
PC
BOARD
TE-2002
€9
©
|
wurvcross
sux
WHT/LONG
LK
TO
RELAY
RC
BOARD
TE-2002
@9
17
Leer
FROM
POWER
TRANSFORMER
18
2)
RELAY
P.C
BOARD
TE-2002
TO
MAIN
MOTOR
SKY/LONG
BLU
3
WHT
TO
CAPACITOR
C4
3.5+15/150L
wir
10
REEL
SIZE
ae
Sw-3
TO
MAIN
MOTOR
==E2
TO
MATE-N-
LOCK
TO
REEL
SIZE
ewitce
=
r
Y
asec
é
LONG
GRN
FROM
SERVO
PC
BOARD
MY-
2036
(2)
TO
POWER
TRANSFORMER
[
TIH(TET-1)
TO
POWER
TRANSFORMER
_REO/WHT.
Ti
(TET=-1)
TO
POWER
TRANSFORMER
|
TO
REEL
SIZE
SWITCH
--
Ssw-3
TO
CAPACITOR
C5
3x2+1x2/250°
TO
MICRO
SWITCH
Sw-8
TO
RIGHT
REEL
MOTOR
.
ons
BLK
[LONG
GRN
: i
a
JLONG
BLK
FROM
CYS-CON
Seated
A
,
=
RC
BOARD
TE-200!16)
pee
ioe
TO
MICRO
SWITCH
Sw-9)
IK
7
4s
en
PNK/LONG
WHT
L
PNK
‘
=:
TI(TET~-1)
TO
MATE-N-LOCK()
TO
POWER
TRANSFORMER
Ti
(TET~1)
TO
POWER
SWITCH
Sw-!
TO
POWER
TRANSFORMER
TI(TET-1)
TO
MICRO
SWITCH
Sw-8
TO
BRAKE
SOLENOID
SL-2
TO
CAPACITOR
Ci
470/160
TO
PINCH
ROLLER
SOLENOID
SL-1t
TO
LEFT
REEL
MOTOR
TO
MICRO
SWITCH
SW-5
TO
BRAKE
SOLENOID
SL-2
TO
PINCH
ROLLER
SOLENOID
SL-1
TO
CAPACITOR
Cl
4707160
TO
MICRO
SWITCH
SW-5
FROM
CYS-CON
PC
BOARD
TE
-
2001)
FROM
CYS-CON
RC
BOARD
TE
-2001
(7)
TO
TENSION
SWITCH
SW—-
7
TO
SERVO
PC
BOARD
MY-
2036
(4)
TO
MATE-N-LOCK(2)
'—]TO
PAUSE
MICRO
SWITCH
SW-6
TO
MATE-N-LOCK
TO
MATE-N-LOCK
FROM
SERVO
RC
BOARD
MY-
2036)
TO
CYS-CON
RC
BOARD
TE-
20016)
FROM
CYS-CON
RC
BOARD
TE-2001@)
FROM
SERVO
PC
BOARD
My-2036
©
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