Teac A-4010GSL - Specified Output Level Set; VU Meter Calibration -Playback-; Frequency Response (Playback)

SPECIFIED OUTPUT LEVEL SET
NOTE:
Connect
a
10
kQ
load
to
the
OUTPUT
jacks
when
not
using
the
TEAC
M~826A
(0
dB
= 0.775V)
level
meter.
Unless
otherwise
specified,
the
EQ/LEVEL
switch
must
always
be
in
the
NORMAL
position
during
measurement
and
adjustment.
9.
Play
the
400
Hz
tone
in
section
1
of
the
test
tape.
This
tone
is
recorded
at
operating
reference
level
(1%
of
the
THD
level).
10.
Turn
the
OUTPUT
controls
full
clockwise,
and
adjust
VR-107/207
for
-2
dB
reading
on level
meter.
ll.
Then
turn
OUTPUT
controls(c.c.w.)
until
a
-8
dB
reading
is
obtained
on
the
level
meter.
:
NOTE:
If
equal
reading
cannot
be
obtained
in
step
10.
Readjust
VR-107/207
slightly.
NOTE:
This
is
the
specified
output
level
set.
Do
not
disturb
this
setting
until
the
remaining
adjustments
have
been
completed.
VU METER CALIBRATION -PLAYBACK-
12.
While
playing
the
400
Hz
tone(1%
THD)
in
section
1
of
the
test
tape,
adjust
VR-108/208
for
a
reading
of
0
VU
on
the
VU
meter.
FREQUENCY RESPONSE
13.
Play
the
test
tones
from
15
kHz
down
to
40
Hz.
(Recorded
at
10 dB
below
operating
reference
level.)
14.
Compare
the
readings
obtained
on
the
level
meter
with
the
response
limits given in figure below.
15.
In
case
of
any
deviation
in
the
response
curve,
check
head
azimuth
alignment,
clean
the
heads,
then
adjust
VR-105/205
for
the
best
response.
NOTE:
7-1/2ips
tape
speed
must
be
used
for
frequency
response
checks
and
adjustments.
Do
not
attempt
VR-105/205
readjustments
at 3~3/4ips.
EQ/LEVEL switch check
-
While
playing
back
400
Hz
(operating
reference
level)
signal,
move
the
EQ/LEVEL
switch
from
HIGH
to
NORMAL
position.
The
VU
meter
should
decrease 3 dB.