www.SteamPoweredRadio.Com
•
..
•
•
•
5.6
Playback
Noise
Measurement
1.
Set
the
selector switch
to
NORMAL and
NR
switch
to
OFF.
2. Play back
the
blank
tape
and make sure
that
the
noise
volume
is
below 2mV when
the
REC LEVEL Knob
is
set
to
both
maximum and minimum.
NOTES:
1. Perform measurements when
the
power hum
is
at
mini·
mum.
2. Perform measurements under conditions where induc-
tion
noise will
not
affect measurements.
5.7
MPX Filter Measurement
1.
Adjust
the
Tape Selector Switch
to
NORMAL.
2.
Put
the
blank
tape
in
the
cassette holder, and set
the
recording conditions. (Dolby N R
"ON",
MPX
"ON"
positions)
3.
Add
a 1kHz
-20dB
signal
to
LINE
IN
. Adjust
the
Rec.
Volume
knob
.
to
0dB Level Meter reading.
4.
Set
the
input
signal
at
19kHz ±10Hz. Adjust T101 (L)
and T201 (R)
to
the
minimum level.
Mode:
record
AFOSC
TONE: 1 kHz, 100mV
VTVM
ldl
Unit
Line Input
Line Output
5.8 Record/Playback
Level
Adjustment
1.
Set
the
tape
selector switch
to
NORMAL.
2. Insert
the
AC-212
test
tape
in
the
cassette holder and
set
the
specified recording
condition
(LINE OUT:
350mV)
.
3. Adjust R119(L) and R219(R)
to
the
same level as
the
monitoring level when
the
tape
is
played back
after
rewinding.
4.
As
for CrO
2
/METAL tapes, make measurements with
the
AC-512 and AC-711
test
tapes as described above.
5.9 Record/Playback Frequency
Response
Ad-
justment
[NORMAL]
1.
Set
the
tape selector switch
to
NORMAL. (with Dolby
NR
"ON"
and
MPX
"OFF")
4
2. Insert
the
AC-212
test
tape
in
the
cassette holder and set
the
recording conditions.
Attenuate
from
550mV
to
25dB on Line
Out
with
the
attenuator
and record
at
1 KHz and 10KHz
on
an unrecorded section
of
the
tape.
3.
Rewind
the
tape
and adjust CB01 (L) and CB02(R)
so
that
the
level for 1 KHz and 10KHz
is
brought
within
±0.5dB for playback.
4.
After
making these adjustment, record and playback
at
1 KHz, 10KHz and 12.5KHz. Make sure results comply
with
the
following diagram.
NR
•oFF•
C,,..~O-H_z
_____
,..!._
3
_d_e_10""'~.Jl•
12.5KHz
NR
•oN•
-----~t-3-dB~l'~dB
250Hz O
~•
I
KHz
12.5KHz
[CtO
2
l
1.
Set
the
tape
selector switch
to
CrO
2
•
2. Insert
the
AC-512
test
tape
in
the
cassette holder and
set
the
recording conditions.
Attenuate
from
550mV
to
25dB
on
Line
Out
with
the
attenuator
and record
at
1 kHz, 1
Ok
Hz, 12.5kHz and 15kHz
on
an unrecorded
section
of
the
tape.
3. Rewind
the
tape
and adjust CB01 (
L)
and CB02(R) so
that
the
level for 1 kHz and 1
Ok
Hz
is
brought
within
±0.5dB
for
playback.
4.
After
making these adjustments, record and playback
at
1 kHz, 10kHz, 12.5kHz and 15kHz. Make sure results
comply
with
the
following diagram.
NR
3d8
5d8
BdB
250Hz
15KHz
-~13_dB-,7J5dB
250Hz
IOK~H
z 12.5KHz
To Next Page
Loading...
