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JVC DD-9 A - Page 15

JVC DD-9 A
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Step
DD-9A/B/C/E/J/U
Item
Adjustment
Adjusting
|
Standard
point
value
Remarks
4*
FL
(Fluores-
cence
Level)
indicator
sensitivity
Nom
.
Set
the
METER
switch
to
VU.
.
Set the
MONITOR
switch
to
SOURCE,
then
apply
a
1kHz
signal
of
around
—20
dB
to
the
R-ch
and
L-ch
of
the
LINE
IN
terminals.
.
Adjust
the
INPUT
LEVEL
control
so
that
the
output
level
at
the
LINE
OUT
termi-
nals
is
—4
dB.
.
Adjust
VR701
(“0”
dB
level
adjustment)
so
that
“0”
dB
lights
at
both
R
and
L.
At
this
time,
‘’0’’
dB
must
go
out
at
both
R
and
L
with
the
input
ATT
(attenuation)
level
lowered
by
0.5
dB.
.
Lower
the
input
ATT
level
by
20
dB.
.
Adjust
VR501
(L-ch)
and
VR6O1
(R-ch)
so
that
““—20”
dB
lights
at
both
R
and
L.
At
this
time,
“—20’
dB
must
go
out
at
both
R
and
L
with
the
input
ATT
level
lowered
by
1
dB.
.
Repeat
steps
4.—
6.
VR701,
VR501,
VR601
0VU
—20
VU
Due
to
parts
replacement.
Encoder
(recording)
calibration
Dolby
C
adj.
=
.
Off
the
Dolby
C
NR
switch.
.
Apply
a
400
Hz
signal
to
LINE
IN.
(Bal-
ance
VR
set
to
center,
and
input
level
con-
trol
set
to
some
position.)
.
Adjust
input
signal
so
that
TP103
output
level
becomes
—2.5
dBs.
.
Adjust
VRAQ2
and
BO2
so
that
TP104
output
level
becomes
—2.5
dBs.
VRAO2
B02
LINE
IN
—2.5dBs
Dolby
C
circu
o
Balance
VR
<I
Input
TPIO3
level
control
VRAC2
1C
AO4
TPIO4
This
checking
should
be
per-
formed
for
normal,
chrome
and
metal
tapes
and
for
both
right
and
left
channels.
1.
Bias
current
adjustment
for
a
cassette
deck
should
generally
be
performed
referring
to
the
record/playback
frequency
response
of
a
cassette
deck
depends
more
greatly
upon
the
bias
current
than
does
that
of
an
open
reel
deck.
The
current
measuring
method
de-
scribed
below
in
an
alternative
2.
If
the
bias
current
is
not
pro-
perly
adjusted,
the
record
and
playback
characteristics
be-
come
as
shown
left.
LINE
IN
.
Balance
VR
set
to
center,
and
input
level
|
VR1
—4
dBs
level
L-ch
control
set
to
max.
and
R-ch
2.
Adjust
input
signal
so
that
output
level
of
deflection
L-ch
monitor
becomes
—4
dBs,
and
then
adj.
adjust
VR1
so
that
output
level
of
R-ch
monitor
becomes
—4
dBs.
Checking
Record
1
kHz,
50
Hz
and
12.5
kHz
signals
at
|
For
SF/
Reference
record/
an
input
level
of
O
VU
to
—20
dB.
NORM
}
frequency;
playback
Play
back
the
tape.
tape;
1
kHz
frequency
|
Check
to
see
that
the
50
Hz
and
12.5
kHz
VR107,
response
signal
output
deviations
fail
within
the
stan-
207
0+
3dB
dard
range,
using
the
1
kHz
signal
output
as
For
SA/
gt
Ue
y
CrO2
0+3dB
a
reference.
tape;
at
i
VR108,
|
12.5
kHz
ee
a
208
a
For
Metal
aS
tape;
8
j
VR109,
5
a
oe
level
209
ra
Decrease
in
high
frequencies
one.
o
(with
a
larger
bias
current)
50
Hz
1
kHz
12.5
Kz
Freauency
(Haz)
Adjusting
1.
Apply
a
1
kHz,
approx.
—10
dB
signal
to
|
VR105,
OVU
recording
the
LINE
IN
terminals.
Adjust
the
record-
205
level
ing
level
controls
until
the
signal
is
avail-
able
at
—4
dBs
at
the
LINE
OUT
termi-
nals.
.
After
checking
to
see
if
the
FL
indicator
becomes
0,
record
the
signal
applied
to
both
left
and
right
channels
using
normal
tape.
.
Play
back
the
recording
part.
Perform
the
recording
signal
adjustment
with
VR105
and
VR205
so
that
the
FL
indicator
be-
comes
0.
The
level
difference
between
left
and
right
channels
for
SF/NORM
tape,
chrome
tape
and
metal
tape
should
be
less
than
1
dB
(1
VU).
Perform
the
adjustment
using
a
normal
tape,
level
difference
be-
tween
recording
and
playback
;
for
SA/CrO2
and
metal
tapes,
should
be
less
than
1.5
dB,
and
that
between
left
and
right
chan-
nels
should
also
be
less
than
1dB.
=4Z
=
No.
4198

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