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Hitachi MX-W50 - Gain and Level Adjustments; Cassette Chassis Checking

Hitachi MX-W50
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MX-W50
Adjustment
procedure
Adjustment
is
made
by
connecting
an
electronic
voltmeter
to
the
LINE
OUT
terminals
and
playback
the
azimuth
alignment
tape.
If
there
is
a
difference
in
the
highest
volume
of
the
two
channels,
adjustment
should
be
made
to
the
left
channel.
At
this
time
check
to
see
if
the
difference
between
channels
is
less
than
2
dB.
lf
it
is
greater,
readjust
again.
After
adjustment
has
been
made
apply
screw
lock.
(Please
adjust
both
TAPE
1
and
TAPE
2.)
3.
Playback
Gain
Adjustment
Tape
Adjustment
value
|
Adjustment
point
Dolby
align-
RT401LR
ment
tape
Adjustment
procedure
Connect
the
electronic
voltmeter
to
the
LINE
OUT
terminals
and
playback
the
Dolby
alignment
tape.
Adjust
so
that
the
reading
of
the
electronic
voltmeter
indicates
adjustment
value.
4.
Bias
current
Adjustment
and
REC/PLAY
Output
Level
Adjustment
Set
RT402L,
R
in
the
center
position
and
record
at
the
recording
level
shown
in
the
table
below
to
adjust
for
each
tape,
then
check
the
playback
level.
Recording
level
Playback
level
Tape
Frequency
Payal
Adjustment
(Hz)
point
Adjustment
Adjustment
procedure
Level
<
point
NORMAL
tape
—25
dB
300
mV
400/10K
ATT
Within
+
1
dB
RT402LR
NORMAL
300
mV
tape
—10
dB
400
ATT
Within
+
1
dB
RT403LR
300
mV
MORMAL
|
eon
OK
tape
Within
+
1
dB
CHROME
ae
400/10K
—25
dB
400/10K
Adjustment
procedure
(1)
Adjustment
of
Bias
current
1)
Connect
an
electronic
voltmeter
to
the
LINE
OUT
terminals
and,
to
the
AUX
IN
terminals
attach
a
audio
oscillator
by
means
of
an
attenuator.
Set
on
“REC”
and
with
the
voltmeter
set
at
300
mV
check
the
output
of
the
audio
oscillator.
Next,
check
the
attenuator
and
set
to
300
mV
—
25
dB.
(Frequency:
400
Hz)
After
recording
at
this
setting
next,
set
the
audio
oscillator
to
10
kHz
and
record
again.
Put
the
recording
unit
on
“PLAY”,
take
a
reading
of
the
output
and
check
to
ascertain
if
the
difference
in
output
between
the
two
frequencies
is
within
the
range
of
+1dB.
If
the
difference
in
output
is
not
within
the
+
1
dB
range,
make
the
appropriate
adjustment
of
the
RT402LR
and
then,
once
again
as
before,
repeat
the
recording
/play-
back
test
making
sure
the
output
is
in
the
+
1
dB
range.
2
—
3
=
4
5.
Cassette
Chassis
Checking
and
Adjustment
2
FF/REW
torque
—
1
ryote
ize
ae
|
—25
dB
an
300
mV
ATT
Inspection
Item
Reference
Value
more
than
85
—
170
g-cm
3
Supply
back-tension
2.0
—
6.0
g:cm
Cassettepack
system
Torque
meter
Within
+3
dB
Within
+3
dB
Note)
When
using
CHROME
and
METAL
tapes
during
checking,
if
the
range
gets
outside
of
the
specified
+3dB,
readjust
using
NORMAL
tape.
(2)
Adjustment
of
REC/PLAY
Output
Level
1)
Connect
an
electronic
voltmeter
to
the
LINE
OUT
terminals
and
an
audio
oscillator
to
the
AUX
IN
termin-
als.
Inputting
a
signal
of
400
Hz
set
on
recording
mode
and
record,
adjusting
the
output
of
the
audio
oscillator
so
that
the
voltmeter
indicates
300
mV—10
GB.
Set
on
“PLAY”
and
check
to
see
if
the
output
is
—10dB
+
1aB.
3)
When
the
output
difference
is
out
of
+
1
dB,
adjust
RT403LR
properly
and
repeat
recording/playback
in
the
same
way
to
adjust
so
that
the
output
difference
is
within
+
1
dB.
2
—
Cassettepack
system
Torque
meter
Cassettepack
system
Torque
meter
299

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