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Technics RS-BX828

Technics RS-BX828
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OVERALL
FREQUENCY
RESPONSE
1.
Insert
the
normal
blank
test
tape
(QZZCRA)
and
set
the
unit
to
the
record
pause
mode.
2.
Apply
a
reference
input
signal
(1kHz,
—24dB8)
through
an
attenuator.
3.
Attenuate
the
signal
by
20dB
and
adjust
the
frequency
from
50Hz~
10kHz.
4.
Record
the
frequency
sweep.
5.
Playback
the
recorded
signa!
and
assure
that
it
is
within
the
range
shown
in
Fig.
15
in
comparison
to
the
reference
frequency
(1kHz).
6.
If
it
is
not
within
the
standard
range,
adjust
VR301
(L-CH)
and
VR302
(R-CH)
so
that
the
frequency
level
is
within
the
standard
range.
¢
Level
up
in
high
frequency
range.........
Increase
the
bias
current.
*
Level
down
in
high
frequency
range
...Decrease
the
bias
current.
7.
Repeat
steps
2~6
above
using
the
CrO,
tape
(QZZCRX)
and
the
metal
tape
(QZZCRZ)
increasing
the
frequency
range
to
12.5kHz
(50Hz~12.5kHz).
8.
Assure
that
the
level
is
within
the
range
shown
in
Fig.16.
LINE
IN
LINE
OUT
EVM
Oscilloscooe
AF
oscillator
=
ATT
OVERALL
GAIN
ADJUSTMENT
1.
Insert
the
normal
blank
test
tape
(QZZCRA)
and
set
the
unit
to
the
record
pause
mode.
2.
Apply
a
reference
input
signal
(1kHz,
—24dB).
Attenuate
the
output
so
that
its
level
becomes
0.4V.
3.
Record
this
Input
signal.
4.
Playback
the
signal
recorded
in
step
3
above,
and
assure
that
the
output
Is
within
the
standard
value.
5.
If
it
is
not
within
the
standard
value,
adjust
VR5
(L-CH)
and
VR6
(R-CH).
6.
Repeat
the
step
2~5
above
until
the
output
is
within
the
standard
value.
Standard
value:
0.4V+0.5dB
REC
CAL.
ADJUSTMENT
1.
After
the
overall
frequency
characteristics
and
over
all
gain
are
adjusted,
insert
the
test
tape
(QZZCRA)
in
the
unit
and
then
set
the
recording
mode
(REC/PLAY).
—
Level
Adjustment
—
R
2.
First,
press
the
REC
CAL
button.
(The
indication
“LEVEL
CAL”
will
appear
in
the
FL
meter.)
3.
Adjust
VR10
so
that
the
level
of
the
right
and
left
channels
reach
the
mark
as
shown.
—
Bias
Adjustment
—
L
4.
Next,
press
the
REC CAL
button
again.
(“BIAS
&
CAL”
will
be
displayed
in
the
FL
meter.)
5.
Adjust
VR9
so
that
the
indication
of
the
left
channel
level
reaches
the
J
mark
as
shown.
RS-BX828
Normal
Overall
frequency
response
chart
(NR
OUT)
50Hz
100Hz
200Hz
CrO,>Metal
Overall
frequency
response
chart
(NR
OUT)
50Hz
100Hz
200Hz
Fig.
14
*
(Level
Adjustment)
coe
L
CUUEGEROQUUASTLONGEODTOTUEUIESI
R
é
LEVEL
CAL
¥
v
VEESURODODDOEUTEEES
CRUUEGDCUROSSEGEON
4
LEVEL
CAL
Fig.
18
Note:
Uniess
the
overall
frequency
and
overall
gain
are
adjusted
so
that
the
L/R
channel
leverls
are
the
same,
there
will
be
a
difference
between
the
L/R
channels
levels
in
the
level
and
bias
adjustments.
LINE
IN
S500Hz
ikHz
2kHz
Fig.
15
12.5kHz
5$00H2
kHz
2kHz
Fig.
16
LINE
OUT
(Bias
Adjustment)
Heuusueacenesuacuanesssennuiciese
COLUUCUCQUEELOGESISS
BIAS
CAL
4
¥
L
lasseanenareanseneat
R
bina)
tt
uy
Fig.
19

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