Technics RS-630USD User manual
ORDER
NO.
ARD-7607065C
Service
Manual
Cassette
Tape
Deck
RS-630USD
Front
Loading
High
Fidelity
Cassette
Deck
with
Large
Peak
Check
Meters
RS-630U
MECHANISM
SERIES
Specifications
(Catalog
specifications
for
sales)
Power
requirements:
AC;
220V,
50Hz
Fast
forward
and
Power
consumption;
10
W
rewind
time:
Motor:
1-electronic
speed
control
motor
Input:
Track
system:
4-track,
2-channe!
recording
and
playback
Tape
speed:
48cm/s
Wow
and
flutter:
0.09
(WRMS),
+0.20%
(DIN)
Output:
Frequency
response:
CrO2
tape;
20~16,000Hz
30
~
14,000
Hz
(DIN)
Normal
tape;
20
~
14,000
Hz
30~13,000Hz
(DIN)
.
Dolby
NR
in;
60
dB
(above
5kHz)
Signal-to-noise
ratio:
Dolby
NR
out;
50dB
(signal
level
=250nWb/m)
REC/PB
connection:
Head:
Dimensions:
Weight:
Approx.
90
seconds
with
C-60
cassette
tape
MIC;
sensitivity
0.25
mV/applicable
microphone
impedance
6002
~
20
KQ
LINE;
sensitivity
60
mV/input
impedance
47
KQ
NE;
output
level
0.42
V/load
impedance
50
KQ
over
HEADPHONE;
output
level
60
mV/82
5P
DIN
type
1-HPF
head
for
record/playback
1-ferrite
head
for
erasing
41.0em(W)
X
14.2cm(H)
X
32.
1cm(D)
7kg
Specifications
are
subject
to
change
without
notice.
Technics
Matsushita
Electric
Trading
Co.,
Ltd.
P.O.
Box
288,
Central
Osaka
Japan
LOCATION
OF
CONTROLS
AND
COMPONENTS
QO
@O@®
©)
a
19
4
Fig.
1
@)
@
Cassette
compartment
door
Headphones
jack
XK
@
Dolby
noise-reduction
switch
(4
Pause
button
@®
Bias
selector
@5
Stop
button
@
Equalization
selector
(6)
Playback
button
(8)
Peak-signal-check
switch
()
Fast
forward
button
©
Peak
level/VU
meters
48)
Rewind
button
@®
Power
switch
(M
Record
button
®)
Recording
indication
lamp
20
Eject
button
(9)
Output
level
control
@)
Line
output
jacks
40
Tape
counter
and,reset
button
@)
Input
selector
4)
Input
level
controls
@)
Record/playback
q2)
Microphone
jacks
@
Line
input
jacks
3
Dolby
is
the
trade
mark
of
Dolby
Laboratories
Inc
DISASSEMBLY
INSTRUCTIONS
(A)
?
6:
Screws
(B):
Screws
E)
:
Screws
(C):
Screws
(D):
Screws
(D):
Screws
Procedure
To
remove
--—.
Remove
——.
;
Shown
in
fig.
——.
Case
cover
i
2,3
Bottom
cover
4
Front
panel
»),
i
;
5,6
Mechanism
).
:
5,6
Main
circuit
board
|
(G),
7
*
When
the
main
circuit
board
is
installed,
be
sure
that
the
slide
switch
and
the
record/playback
select
lever
are
placed
in
proper
position.
(See
fig.
8)
Main
circuit
board
(See
fig.
5)
Fig.
8
ADJUSTMENTS
Before
measuring
and
adjusting
“Overall
frequency
response’,
“Overall
distortion”
and
“Overall
S/N
ratio’,
confirm
that
the
characteris-
tics
of
5
items
below
are
within
standard
which
have
much
relation
to
or
influence
on
electrical
performances
above.
1.
5.
Head
azimuth
adjustment.
2.
Bias
current.
3.
Playback
gain.
4.
Overall
gain.
Playback
frequency
response.
TEST
INSTRUMENTS
1
2.
Prepare
test
instruments
which
are
equivalent
in
accuracy
to
those
shown
below.
The
test
instruments
should
be
inspected
and
corrected
by
specialists
once
every
6
months,
because
a
long
period
of
use
without
maintenance
may
increase
errors
in
indication.
_
Warm-up
the
test
instruments
for
30
minutes
and
the
set
to
be
measured
for
10
minutes
before
taking
the
measurements.
If
not,
there
may
arise
an
error
or
difference
between
the
initial
value
and
the
stabilized
value
measured
after
“aging”.
.
Specifications
of
test
instruments.
(1)
Audio
frequency
oscillator
(2)
a.
Oscillation
frequency
:
5Hz~500
kHz
(5
ranges)
b.
Frequency
tolerance:
+(3%
+1Hz)
c.
Sine
wave
*
Output
voltage:
5Vrms
+
10%
(without
load)
*
Output
frequency
response:
Within
£0.2dB,
20Hz~
20kHz
(at
25°C)
2.5Vrms
+10%
(with
6002
load)
Within
+0.5dB,
5Hz~500
kHz
*
Distortion
factor:
Not
more
than
0.05%,
200
Hz
~
20
kHz
Not
more
than
0.5%,
5Hz~
500
kHz
*
Output
impedance:
6002
unbalanced,
within
+15%
*
Output
attenuator
:
0,
20dB,
Error:
within
+0.2dB
d.
Temperature
in
use
of
set:
|
Temperature=0~
40°C,
Humidity
=
90%
or
less
Automatic-stop
distortion
meter
(with
vacuum
tube
voltmeter)
A.
Distortion
factor
measurement
a.
Frequency
:
400Hz,
1kHz
10%
(fundamental
wave)
b.
Measurement:
0.1~
100%
(6
ranges)
c.
Input:
50mV~50V
d.
Fundamental
wave
attenuation:
60
dB
or
more
B.
Level
measurement
a.
Measurement:
1mV
(—60dB)
~
30
V
(30dB)
(9
ranges)
b.
Frequency
response:
20Hz~100kHz
+0.3dB
(1
kHz
basis)
c.
Input
impedance:
1MQ
+£10%,
less
than
50
pF
d.
Error
in
indicated
value:
Within
+3%
at
1kHz
C.
Output
terminal
a.
Frequency
response:
10Hz~100kHz
+1dB
b
100kHz~1MHz
+3dB
.
Output
voltage:
1Vrms
+10%
(1kHz
sine
wave)
(3)
Attenuator
a.
Input
impedance:
6002
unbalanced
b.
Maximum
attenuation:
121dB
c,
Minimum
attenuation:
0.1dB
(4)
Oscilloscope
a.
Cathode
ray
tube:
Effective
ranges
8X
8cm
b.
Vertical
axis
*
Input
sensitivity
:
30
mV
~30
V/cm
*
Frequency
band:
DC
~2MHz
*
Transient
time:
180ns.
*
Input
impedance:
1MQ,
35
pF
c.
Horizontal
axis
*
Tuning
range:
30Hz~
2MHz
*
Sweep
time:
Llus~
100
ms/cm
*
External
sweep:
1
Vp-p/cm
or
more
(5)
Digital
electronic
counter
a.
Number
of
figure:
4
(decimal
system)
b.
Input
sensitivity:
100
mVrms
c.
Input
impedance:
1MQ,
40
pF
d,.
Frequency
measurement
range:
10Hz~
100kHz
e.
Counting
time:
0.1,
1,
10s
(6)
Wow
meter
a.
Measured
center
frequency
range:
3kHz
+4%
b.
Input
level
range:
30mV~3V
c.
Input
impedance:
About
50
KQ
unbalanced
d.
Measurement:
0.01~3%
(5
ranges)
e.
Indicator
error:
Maximum
error
in
indicated
value
+5%
in
each
range.
f.
Frequency
response:
Conforming
to
weighting
curve
characteristics
(WRMS),
JiS
C5551.
Flat
characteristics
(RMS)
0.5~200Hz,
within
—3dB
(4Hz
basis)
g.
Meter
indication
system:
Effective
value
indication,
conforming
to
JIS
C5551
h.
Meter
response
characteristic:
About
5~
7
sec.
|.
Oscillation
frequency:
3
frequencies
(3kHz,
3kHz
+3%)
J.
Temperature
range:
0~40°C
Il.
MEASUREMENT
CONDITIONS
1.
Standard
measurement
conditions
*
Ambient
temperature:
10~30°C
(50~86*)
*
Ambient
humidity:
30~90%
RH
*
Power
voltage
accuracy:
+3%
2.
Position
of
tape
recorder
*
When
measuring,
place
the
unit
under
test
in
a
horizontal
position.
3.
Oscillator
output
voltage
adjustment
*
Connect
the
equipments
as
shown
in
the
following
and
adjust
the
oscillator
output
control
knob
for
1V
(f=
1kHz)
through
the
attenuator
while
keeping
the
attenuator
at
OdB.
*
When
supplying
a
signal
to
the
tape
recorder
amplifier,
adjust
the
input
level
using
the
attenuator.
Output
Control
Knob
Resistor
600Q
;
:
Attenuator
Vaci
Audio
Frequency
vorneter
Oscillator
Oscilloscope
Wl.
TEST
TAPE
Test
tape
life
The
more
frequently
the
test
tape
is
used,
the
more
the
tape
characteristics
will
deteriorate
(e.g.
lowering
of
recorded
tevel,
worsening
of
frequency
response
particularly
in
high-frequency
range,
and
an
increase
in
wow
due
to
tape
elongation)
until
meas-
ured
values
become
unreliable.
Even
in
such
a
case
when
a
tape
is
not
used,
but
stored,
for
a
long
period
of
time,
tape
shows
deterioration
in
performance
because
of
self
damagenetization
due
to
storage
conditions,
etc.
Please
refer
to
the
tape
life
specification
and
use
care
not
to
use
a
tape
longer
than
its
rated
life
when
servicing.
Frequence
of
use:
Not
more
than
20
times
for
each
tape
length.
Storage
period:
Not
more
than
6
months.
%
Test
tape
PARTS
NO.
PARTS
NAME
SPECIFICATIONS
REMARKS
STANDARD
REC.
5
TIMES
REPETITIVE
RECORDING
LEVEL
&
FREQ.
TAPE
SPEED:
1-7/8
IPS.
(4.8CM/S),
RESPONSE
TAPE
FULL
TRACK
(10MIN.)
OdB:
STANDARD
REC.
LEVEL
(160pWb/mm)
—10dB
WOW
&
TAPE
TAPE
SPEED:
1-7/8
IPS.
(4.8CM/S),
SPEED
TAPE
3kHz
FULL
TRACK
(45
MIN.)
OdB:
250pWb/mm
-10
4B
TAPE
SPEED:
1-7/81PS.
(4.8CM/S),
AZIMUTH
TAPE
6.3kHz
FULL
TRACK
(15MIN)
0dB:
250pWb/mm
REFERENCE
BL
TAPE
(NORMAL
UNRECORDED
TAPE
(20MIN.)
REFERENCE
B
TAPE
(CrO2)
UNRECORDED
TAPE
(20
MIN.)
IV.
MEASUREMENT
&
ADJUSTMENT
METHOD
NOTE:
1.
Make
sure
heads
are
clean.
2.
Make
sure
capstan
and
pressure
roller
are
clean.
3.
Judgeable
room
temperature:
205°C
(68
£9°F)
4.
Dolby
NR
switch:
OUT
Pressure
of
pressure
roller
Equipment
:
*
Tension
gauge
(max.
500
gr)
Takeup
tension
Equipment:
*
Cassette
torque
meter
(SRK-CT
or
RP8063)
5.
Bias
selector:
LOW
6.
Equalizer
selector:
1204S
7.
Peak
check
switch:
OUT
8.
Output
level
control:
MAX.
MEASUREMENT
&
ADJUSTMENT
.
Place
UNIT
into
playback
mode.
.
Hook
the
tension
gauge
to
pressure
roller
lever
and
pull
it
in
the
direc-
tion
of
the
arrow
as
shown
in
fig.
9.
.
Measure
the
tension
at
the
moment
when
the
pressure
roller
moves
away
from
the
capstan.
Standard
Value:
400+
50
gr
Adjustment
method
Bend
the
part
(A)
of
the
pressure
roller
spring
in
either
direction
shown
by
the
arrow
until
the
correct
pressure
is
attained.
1.
Mount
cassette
torque
meter
on
UNIT.
2.
Place
UNIT
into
playback
mode
and
read
takeup
torque.
3.
Measure
several
times
and
determine
the
mean
value
Standard
Value:
55+15gr-cm
If
the
measured
value
is
not
within
standard,
firstly
clean
the
rotational
parts
of
the
mechanism
with
alcohol,
and
if
it
still
is
not
within
standard,
make
the
following
adjustment.
Adjustment
method
Adjust
by
turning
the
plate
spring
attached
in
the
takeup
reel
table
(See
fig.
10).
REMARKS
*
Playback
mode
.
Pressure
roller
roller
spring
Fig.
9
*
Playback
mode
Plate
spring
Fig.
10
Head
azimuth
adjustment
Equipment:
*
VTVM
*
Oscilloscope
*
Test
tape
(azimuth)---C-AA
Record/playback
head
adjustment
1.
Test
equipment
connection
is
shown
below.
LINE
OUT
Test
tape
Playback
mode
VTVM
Fig.
11
Oscilloscope
.
Play
azimuth
tape
(C-AA
6.3
kHz).
.
Adjust
record/playback
head
angle
adjustment
screw
(B)
in
fig.
12
so
that
output
level
at
LINE
OUT
becomes
maximum.
.
Measure
both
channels,
and
adjust
levels
for
equal
output.
.
After
adjustment
lock
head
adjustment
screw
with
lacquer.
*
Playback
mode
R/P
head
Tape
speed
Equipment:
*
Digital
electronic
counter
or
frequency
counter
(RP8067)
*
Test
tape---C-WAT
MEASUREMENT
&
ADJUSTMENT
Tape
speed
accuracy
1.
Test
equipment
connection
is
shown
below.
LINE
OUT
Test
tape
Playback
mode
Digital
electric
counter
Fig.
13
.
Play
test
tape
(C-WAT
3,000Hz),
and
supply
playback
signal
to
fre-
quency
counter.
.
Measure
this
frequency.
.
On
the
basis
of
3,000
Hz,
determine
value
by
following
formula:
Tape
speed
accuracy
=
(43
x
100]
%
where,
f
=
measured
value
.
Take
measurement
at
middle
section
of
tape.
Standard
Value:
+1.5%
|
Adjustment
method
1.
Play
the
test
tape
(middie).
2.
Adjust
the
tape
speed
adjustment
VR
shown
in
fig.
28
so
that
fre-
quency
becomes
3,000
Hz.
Tape
speed
fluctuation
Make
measurements
in
same
manner
as
above
(beginning,
middle
and
end
of
tape),
and
determine
difference
between
maximum
and
minimum
values
and
calculate
as
follows:
Tape
speed
fluctuation
=
(A508-
x
100]
%
fi
=maximum
value
f2
=
minimum
value
Standard
Value:
1%
|
REMARKS
*
Playback
mode
Wow
and
flutter
Equipment:
*
Wow
meter
*
Test
tape---C-WAT
1.
Test
equipment
connection
is
shown
below.
LINE
OUT
Test
tape
Playback
mode
Wow
meter
Fig.
14
.
Use
wow
test
tape
(3,000Hz)
and
measure
the
playback
signal
on
wow
meter.
.
Wow
and
flutter
is
expressed
in
percentage
and
that
measurernent
can
be
weighted
by
JIS
network
(WRMS).
.
Measure
at
middle
section
of
test
tape.
Standard
Value:
0.12
%
(WRMS)
+
Playback
mode
Playback
frequency
response
Equipment:
*VTVM
*
Oscilloscope
*
Test
tape---C-FH
MEASUREMENT
&
ADJUSTMENT
.
Test
equipment
connection
is
as
same
as
“Head
azimuth
adjustment”
but
use
the
test
tape
(C-FH)
instead
of
head
azimuth
tape
(See
fig.
1):
.
Place
UNIT
into
playback
mode.
_
Play
frequency
response
test
tape
(C-FH).
.
Measure
output
level
at
10KHz,
8kHz,
4kHz,
1kHz,
125Hz
and
63Hz
and
compare
each
output
level
with
standard
frequency
333Hz,
at
LINE
OUT.
.
Make
measurement
for
both
channels.
.
Make
sure
that
the
measured
value
is
within
the
range
specified
in
the
frequency
response
chart.
Playback
frequency
response
chart
440
Hz
Fig.
15
.
If
measured
value
is
not
in
standard,
adjust
VR1
(L-CH),
VR2
(R-CH)
(See
fig.
28
on
page
14).
Playback
gain
Equipment:
*VTVM
*
Oscilloscope
*
Test
tape---C-FH
REMARKS
*
Playback
mode
.
Test
equipment
connection
is
shown
in
fig.
11.
.
Play
standard
recording
level
portion
on
test
tape
(C-FH
333Hz),
and
using
VTVM
measure
the
output
level
at
LINE
OUT
jack.
.
Make
measurement
for
both
channels.
|
Standard
Value:
0.42V
(—7dB)
Adjustment
1.
If
measured
value
is
not
standard,
adjust
VR3
(L-CH),
VR4
(R-CH)
(See
fig.
28
on
page
14)
2.
After
adjustment,
check
“Playback
frequency
response”
again.
*
Playback
mode
Playback
S/N
ratio
Equipment:
*VTVM
*
Oscilloscope
*
Test
tape---C-FH
*
Empty
cassette
est
equipment
connection
is
shown
in
fig.
11.
jay
standard
recording
level
test
tape
(C-FH
333Hz)
and
read
out-
ut
level
on
VTVM.
efer
to
“Playback
gain
adjustment”.
ace
empty
cassette
(which
has
been
cut)
and
play
again.
.
Measure
noise
level
at
this
time
using
VTVM,
and
determine
ratio
of
this
level
to
test
tape
output
signal
voltage
(333
Hz).
Standard
Value:
Greater
than
43dB
An
example
calculation
is
shown
below.
A:
Es
=
playback
output
signal
voltage
of
test
tape
(333
Hz)
B:
En=
playback
output
noise
level
Es=0.42V
(—7dB)
En
=
3.0mV
(—50dB)
i
Sr
ES
0.42V_
S/N
ratio
=
En
=
30mv
=
140
20
logio
140
=
43dB
S/N
ratio
=
Es(dB)
—
En(dB)
=
—7—(—50)=43dB
+
Playback
mode
Bias
current
Equipment:
*
VTVM
*
Oscilloscope
Erase
current
Equipment:
*
VTVM
*
Oscilloscope
*
Resistor
(1)
MEASUREMENT
&
ADJUSTMENT
1.
Test
equipment
connection
is
shown
below.
Record
mode
R1
(L-CH)
VTVM
Oscilloscope
Fig.
16
.
Place
UNIT
into
record
mode,
and
tape
selector
to
“NORMAL.”
(for
normal
tape).
.
Read
voltage
on
VTVM
and
calculate
bias
current
by
following
for-
mula:
Value
read
on
VTVM
(V)
10
(Q)
Bias
current
(A)
=
Standard
Value:
0.17+0.15mA
.
Adjust
L5
(L-CH),
and
L6
(R-CH)
(See
adjustment
part
location
on
page
14).
.
Then
changing
the
equalizer
selector
to
7OuS
and
bias
selector
to
HIGH
(for
CrOz
tape),
confirn
that
bias
current
become
greater
by
25%
than
that
for
normal.
.
Connect
12
resistor
between
ground
side
terminal
of
erase
head
and
ground
lead
wire
removed
(See
fig.
18).
.
Connect
VTVM
to
both
ends
of
1
resistor.
Erase
head
VTVM
Oscilloscope
Fig.
17
3.
Place
UNIT
into
record
mode
and,
measure
voltage
across
the
12
resistor.
4.
Determine
erase
current
with
the
following
formula:
Voltage
across
1Q
resistor
(V)
1(Q)
Erase
current
(A)
=
Standard
Value:
More
than
70mA
REMARKS
*
Record
mode
+
Be
sure
the
ground
end
of
the
meter
is
connected
to
the
ground
end
of
the
resistor.
+
When
bias
current
is
adjusted
on
one
channel
only,
note
that
bias
current
on
the
other
channel
may
vary.
+
Record
mode
Erase
head
BLACK
Fig.
18
ITEM
MEASUREMENT
&
ADJUSTMENT
REMARKS
Overall
gain
Equipment:
*
AF
oscillator
*
VTVM
*
ATT
*
Oscilloscope
*
Test
tape
(reference
blank
tape)
C-RA
for
Normal
Level
meter
Equipment:
*
VTVM
+
Oscilloscope
*
AF
oscillator
*
ATT
1.
Test
equipment
connection
is
shown
in
fig.
19.
AF
oscillator
Record
mode
LINE
IN
Test
tape
R/P
head
Playback
mode
yTVM
Oscilloscope
Fig.
19
Test
tape
.
Place
UNIT
into
record
mode,
and
equalizer
selector
to
1204S,
bias
selector
to
LOW
(for
normal
tape).
.
Supply
1kHz
signal
(—24dB)
from
AF
oscillator,
through
ATT,
to
LINE
IN.
.
Adjust
ATT
until
monitor
level
at
LINE
OUT
becomes
0.42
V
(—7
dB).
.
Using
test
tape
(C-RA),
make
recording.
.
Playback
recorded
tape,
and
make
sure
the
value
at
LINE
OUT
on
VTVM
becomes
0.42
V.
.
If
measured
value
is
not
0.42V,
adjust
VR15
(L-CH),
VR16
(R-CH)
(See
fig.
28
on
page
14).
.
Repeat
from
step
(2).
When
there
is
no
signal
1.
Turn
off
the
power
supply
to
the
set.
2.
Check
whether
the
indication
needles
of
the
level
meters
are
in
the
position
shown
in
fig.
20.
3.
If
they
deviate
to
the
position
shown
above,
adjust
the
zero
adjuster.
4.
Turn
on
the
power
supply
to
the
set.
*
Record/playback
mode
*
LINE
IN
level
control
..
MAX
*
Input
selector---LINE
IN
*
Standard
input
level:
LINE
IN
—24+3dB
DIN
+++
~36+3dB
*
Record
mode
10
11
Overall
distortion
Equipment:
*
Distortion
meter
+
AF
oscillator
*
ATT
+
Oscilloscope
*
Test
tape
(reference
blank
tape)
++
C-RA
C-RA
for
Normal
C-RF
for
CrOz
MEASUREMENT
&
ADJUSTMENT
When
standard
recording
level
is
supplied.
Test
equipment
connection
are
shown
in
fig.
21.
LINE
OUT
ATT
Record
mode
VTVM
Fig.
21
AF
oscillator
Oscilloscope
Set
the
peak
level
check
switch
to
the
“IN”
position
Supply
a
1kHz
signal
from
the
AF
oscillator,
through
the
ATT,
to
the
LINE
IN
Jack
_
Adjust
the
ATT
so
that
the
monitor
level
at
LINE
OUT
becomes
0.42
V.
Adjust
VR13
(L-CH)
and
VR14
(R-CH)
so
that
the
VU
meters
indicate
(See
fig.
22)
Si
ith
OVU.
l
Calibrations
for
“IN”
position
of
peak
check
switch.
Calibrations
for
“OUT”
position
of
peak
check
switch.
Balance
of
left
and
right
level
meters
9,
Set
the
peak
level
check
switch
to
the
“OUT”
position
10.
Then
adjust
VR18
for
L-CH
so
that
left
and
right
VU
meters
show
the
same
indication.
1.
Test
equipment
connection
is
shown
in
fig.
23.
LINE
IN
R/P
head
ATT
6000
Record
mode
Test
tape
Playback
mmole
i
re
e
Test
tape
J‘
son
meter
Fig.
23
.
Supply
1kHz
signal
to
LINE
IN
and
adjust
ATT
so
that
output
level
at
LINE
OUT
indicates
0.42
V
(—7
dB).
.
Make
recording.
.
Playback
and
measure
distortion
factor
of
output
signal.
.
When
the
distortion
factor
does
not
satisfy
the
standard,
check
the
bias
current.
When
the
bias
current
is
lower
than
standard,
distor-
tion
will
increase.
Care
should
be
exercised
in
the
adjustment
because
the
bias
current
also
has
an
influence
on
the
overall
frequency
response.
Refer
to
“The
overall
frequency
response”
and
“The
bias
current
adjustment”.
Standard
Value:
Less
than
2.3
%
(Normal)
Less
than
3.3%
(CrOz)
REMARKS
*
Input
selector--
“LINE
IN
*
LINE
IN
level
control
*
Input
selector:
-LINE
IN
ITEM
MEASUREMENT
&
ADJUSTMENT
REMARKS
Overail
frequency
response
|
Equipment:
+*VTVM
*
AF
oscillator
*
ATT
*
Test
tape
(reference
blank
tape)
C-RA
for
Normal
C-RF
for
CrOz
Note:
Before
measuring
and
adjusting,
make
sure
of
the
playback
frequency
response
(For
the
method
of
measurement,
please
refer
to
the
playback
frequency
response).
1.
Test
equipment
connection
is
shown
in
fig.
19.
2.
Load
reference
blank
test
tape
and
place
UNIT
into
record
mode.
3.
Supply
1
kHz
signal
from
AF
oscillator
through
ATT
to
LINE
IN.
4.
Adjust
ATT
so
that
input
level
is
—20dB
below
standard
recording
level
(standard
recording
level
=O
VU).
.
At
this
time,
LINE
OUT
level
indicates
0.042
V.
.
Record
each
frequency
50Hz,
100Hz,
200Hz,
700Hz,
1kHz,
1.5
kHz,
2kKHz,
4kHz
and
11kHz
(12kHz
for
CrOz)
at
the
same
level.
.
Playback
and
express
in
dB
the
difference
between
playback
output
level
of
each
frequency
based
on
playback
output
level
of
1
kHz.
.
Make
sure
that
the
measured
value
is
within
the
range
specified
in
the
overall
frequency
response
chart.
Overall
frequency
response
chart
(Normal)
2kHz
Fig.
24
9.
Set
the
equalizer
selector
to
70uS
and
bias
selector
to
HIGH
(for
CrOz
tape).
10.
Measure
as
same
as
manner
above.
11.
Make
sure
that
the
measured
value
is
within
the
range
specified
in
the
overall
frequency
response
chart
for
CrOz
tape
below.
Overall
frequency
response
chart
(CrO2)
Fig.
25
Adjustment
1-Using
bias
current
4k
GkHz
—1OkH2
11
kHz
Fig.
26
*
Record/playback
mode
+
Record
level
control
..-
MAX
+
Use
test
tape
C-RA
+
Input
selector---LINE
IN
*
Use
test
tape
C-RF
12
Overall
frequency
response
(As
a
standard
for
adjustment)
Overall
S/N
ratio
Equipment:
*
VTVM
*
AF
oscillator
*
ATT
*
Oscilloscope
*
Test
tape
(reference
blank
tape)
“CRA
Dolby
NR
circuit
Equipment:
+
VTVM
*
AF
oscillator
*
ATT
*
Oscilloscope
13
es
MEASUREMENT
&
ADJUSTMENT
1.
When
the
frequency
response
between
the
middle-
and
high-frequency
range
becomes
higher
than
the
standard
value,
as
shown
by
the
solid
line
in
figure
26,
increase
the
bias
current
by
turning
L5
(L-CH),
L6
(R-CH).
.
When
it
becomes
lower,
as
shown
by
dotted
line,
reduce
the
bias
cur-
rent
by
turning
L5
(L-CH),
L6
(R-CH).
Note:
1.
For
adjustment
when
the
bias
current
is
lower
than
the
standard
value
0.17
mA,
use
the
procedure
indicated
in
adjustment
2,
because
reduc-
ing
the
bias
current
beyond
this
point
may
worsen
the
distortion
factor.
2.
For
the
method
of
bias
current
measurement,
refer
to
“Bias
Current
Adjustment”
on
page
9.
Adjustment
2-Using
the
peaking
coil
for
recording
equalization
UwHZ
2aHe
3kHz
1OwHZ
UI
kHz
Fig.
27
When
the
frequency
response
is
flat
in
the
middle-frequency
range
and
makes
a
sharp
rise
or
drop
in
the
high-frequency
range,
as
shown
in
fig.
27,
adjust
by
turning
the
peaking
coil
3
(L-CH),
L4
(R-CH)
for
normal
tape
recording
equalization.
.
Test
equipment
connection
is
shown
in
fig.
19.
2.
Supply
1kHz
signal
to
LINE
IN
and
adjust
ATT
so
that
output
level
at
LINE
OUT
indicates
0.42
V
(—
7
dB).
.
Make
recording.
.
Make
another
recording
without
supplying
signal
(disconnect
input
plug
to:
LINE
IN).
.
Rewind
to
recorded
part
and
playback.
.
Measure
output
signal
level
and
no
signa!
level
(noise),
and
determine
the
ratio
in
decibels
(dB).
.
The
value
is
difference
between
“Playback
S/N
and
overall
S/N’,
but
for
decibel
calculation
refer
to
“Playback
S/N
measurement”
on
page
8.
Standard
Value:
Greater
than
40dB
(without
NAB
filter)
REMARKS
*
Record/playback
mode
*
LINE
IN
level
control
--MAX
*
Erase
the
tape
with
a
bulk
tape
eraser.
*
Input
selector---LINE
IN
1.
Place
UNIT
into
record
mode,
set
the
Dolby
NR
switch
to
OUT
posi-
tion
and
supply
to
LINE
IN to
obtain
—34.5dB
at
TP3
(L-CH),
TP4
(R-CH)
(frequency
5
kHz).
.
Confirm
that
the
value
at
IN
position
is
8dB
greater
than
the
value
at
OUT
position
of
Dolby
NR
switch.
.
When
it
is
not
in
condition
above,
adjust
as
follows.
.
Set
VR7
(L-CH),
VR8
(R-CH)
to
maximum.
.
Set
the
Dolby
NR
switch
to IN
position.
_
At
this
time
adjust
VR9(L-CH),
VR10
(R-CH)
so
that
the
reading
of
VTVM
become
10-dB
greater
than
the
value
in
step
(1)
above.
.
Adjusting
VR7
(L-CH),
VR8
(R-CH),
make
the
reading
of
VTVM
be-
come
2dB
smaller
than
the
value
obtainted
through
the
adjustment
in
step
(6)
above.
*
Record
mode
*
LINE
IN
level
control
...MAX
*
Input
selector---LINE
IN
eee
Se
Ao
|
ADJUSTMENT
PARTS
LOCATION
ELECTRICAL
PARTS
LOCATION
VRO
VR7
VR13
VR18
L3
L4
VR14
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|
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Adjustment
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VR1
VR3
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VR3
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28
(S10,J1,2,5,6,8)
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TERMINATIONS
(BOTTOM
VIEW)
-Record/playback
select
switch
(shown
in
playback
position).
-
Dolby
noise
reduction
switch
(shown
in
OUT
position).
-
Bias
select
switch
(shown
in
LOW
position).
-
Equalization
select
switch
(shown
in
120xS
position).
Peak
signal
check
switch
(shown
in
OUT
position).
Muting
switch
(OFF
at
PLAY
&
REC
position).
-
Motor
ON/OFF
switch
(shown
in
ON
position).
-
Power
ON/OFF
switch
(shown
in
ON
position).
-
Input
select
switch
(shown
in
MIC
position).
Playback
equalizer
adjustment
VR.
Playback
gain
adjustment
VR.
Input
level
control.
Dolby
NR
adjustment
VR.
-
Output
level
control.
Level
meter
adjustment
VR.
Recording
level
adjustment
VR.
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1
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3.
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9
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$9-1,$9.2
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$10-1,
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10.
VR1,2-
F
11.
VR3,4-
Cs
a8
s¢
8
12.
VR5,6-
13.
VR7~10-
14,
VR11,
12-
15.
VR13,
14-
AC7.55V
2
16.
VR15,
16-
1201
17.
VR18
Level
meter
balance
adjustment
VR.
Tr
201,
Tr
202
18.
L3,4-
Recording
equalizer
adjustment
coil.
TI,2
ad
19.
L5,
6:
--»
Bias
current
adjustment
coil.
0.1
10
28013472
20.
Resistor
values
are
in
ohm
(2),
1/4
watt
unless
specified
otherwise.
K=1,0009.
|
le
21.
Capacitor
values
are
in
microfarads
(uF)
unless
specified
otherwise.
J
P=Pico-farads.
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22.
Voltage
values
are
under
no
signal
conditions
with
volume
at
minimum
position.
The
upper
values
should
be
measured
during
recording
and
the
lower
values
during
playback.
23.
The
mark
(¥)
shows
test
point.
e.g.
Y=Test
point
1.
24.
For
parts
which
are
shaded
(
,
only
parts
specified
‘by
the
manufacturer
should
be
used
for
replacement
in
critical circuit.
13.4¥
ACIB.LY
7
AC18.5V
ERASE
HEAD
lORORC)
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CIRCUIT
BOARD
ACI8.1V
AC18.5V
MAIN
CIRCUIT
BOARD
ACT.5V
AC7.55V
=
TrlO
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10K
(B)
Tr
7.8V
8.5V
2.01V
211V
0.92V
O.91V
SWITCH
CIRC
UIT
BOARD
NOTE:
The
circuit
shown
in
red
on
Values
indicated
in
chassis
and
electrical
parts.
the
conductor
is
B
circuit.
are
DC
voltage
between
the
The
upper
values
should
be
measured
during
recording
and
the
lower
values
during
playback.
16
WIRING
CONNECTION
DIAGRAM
MoDEL
RS-630USD
6P
TERMINAL
BOARD
RECORDING
INDICATION
LAMP
LEVEL
METER
S8:
MOTOR
ON/OFF
SWITCH
$7:
MUTING
SWITCH
POWER
TRANSFORMER
ORG
WHT
FUSE
HOLDER
AC
POWER
CORD
ERASE
HEAD
SLO
WHT
BLK
NOTE:
BLK.
Black
BLU
Blue
BRN
Brown
GRY
Gray
GRN
Green
L.
BLU:
Light
Biue
NIL.
----No
Color
Mark
ORG:
--
Orange
PNK
“Pink
RED
Red
SLD
Shieid
Wire
VLT
Violet
INPUT
SELECTOR
WHT
White
LINE
<
->MIC
YEL
Yellow
EXPLODED
VIEWS
18
19
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