Teac A-450 - RECORD LEVEL SETTING; DISTORTION CHECKS

Hi-Fi TAPE
12.
13.
14.
15.
16.
17.
Load
a
TEAC
MTT-501
test
tape
with
the
BIAS/EQ
switches
set
to
the
“3”
position
and
with
the
DOLBY
NR
switch
set
to
IN.
Apply
and
record
2
tone
signals,
in
turn;
a
400
Hz
tone
at
—38
dB
(9.75
mV)
and
a
10
kHz
tone
at
—38
dB.
Rewind
and
play
this
recorded
section.
Compare
the
differences
between
the
output
level
of
the
400
Hz
signal
and
that
of
the
10
kHz
signal.
The
output
level
of
the
10
kHz
signal
must
be
4
dB
above
the
400
Hz
signal
level.
Adjust
VC103/203
to
achieve
this,
continuing
the
process
of
the
recording-rewinding-playing-adjusting.
7-3-3.
RECORD
LEVEL
SETTING
CrO,
TAPE
18.
19.
20.
21.
22.
Load
a
TEAC
MTT-505TB
test
tape
and
set
the
BIAS/EQ
switches
to
the
“1”
position.
Apply
and
record
a
400
Hz
test
signal
at
—5
dB
(435
mV).
Rewind and play this recorded section.
Adjust VR103/203 to obtain —5 dB.
Continue
the
process
of
the
recording-rewinding-
playing-adjusting
until
this
—5
dB
is
obtained.
OUTPUT RESPONSE
BIAS CURRENT ———=
T-396-1
Fig. 7-13 Bias Adjustments (Hi-Fi tape}
Fe-Cr TAPE
23.
Repeat
the
above
procedure,
with
the
following
ex-
ceptions.
BIAS/EQ switches: “2” position
Test tape: MTT-504T
Adjustments: VR104/204
Hi-Fi TAPE
24.
Repeat
the
above
“CrO,
Tape”
procedure,
with
the
following exceptions.
BIAS/EQ switches: “3” position
Test tape: MTT-501
|
Adjustments:
VR105/205
7-3-4.
DISTORTION
CHECKS
CrO, TAPE
1.
2. Apply and record a 400 Hz test
tone at -8 dB (308 mV).
3. Rewind and play this recorded
section.
4. Read the indicated value on the
distortion analyzer.
Fe-Cr TAPE
5. Repeat the above procedure, with
the following exceptions.
BIAS/EQ switches:
“2” position ‘
Test
tape:
MTT-504T
SWITCH
&
CONTROL
SETTING:
Hi-Fi
TAPE
poe
6. Repeat the above “CrO, Tape” . i :
procedure, with the following ex- .
ceptions.
Load a TEAC MTT-SOSTB test
tape.
BIAS/EQ switches:
“3” position
Test
tape:
MTT-501
Specification:
2.5%
or
less
(w/
3
types
of
tape)
_
CONNECTION
OSCILLOSCOPE
DISTORTION ANALYZER
DECK
under TEST
Fig. 7-14 Connection
Cnr 2 Peem cory SOURCE
;
Controls
are
same
as
8
Q
G
preceding
section.
23