Teac A-3340 - Page 42

2.
Apply
a
signal
swept
from
50
Hz
to
15
kHz
to
the
unit
while
record-
ing
on
a
record
test
tape.
Refer
to
Fig.
7-9.
3.
Repeat
the
above
procedure
for
3-3/4ips
using
a
signal
from
50
Hz
to
7.5
kHz.
,
RESPONSE IN dB
50
100
500
1K
5K
10K
50K
F
“FREQUENCY
IN
Hz
Pere
Fig.
7-9
Frequency
Response
Limits
-Record-
NOTE
If
the
response
is
not
uniform,
the
heads
should
be
checked
for accumulated oxide and dirt.
Then
if
no
dirt
is
found,
the
equalization
coils
L
301/303
should
be
adjusted.
a
A,
If
further
adjustment
is
required,
C
306/315
must
be
changed,
if
the
high
end
response
is
too
high,
a
lower
value
capacitor
must
be
installed.
-BIAS switch in HIGH position-
No adjustment is given for this procedure.
.
Thread
a
Scotch
203
high
output
tape
on
the
unit.
Place the BIAS switch in the HIGH position.
.
Repeat
the
overall
response
check
at
both
tape
speeds.
The
record
equalization
should
give
the
proper
frequency
response.
CON DAM
Be
ean
ee
ce
a
ee
es
LEVEL
VARIATIONS
Using
Scotch
203
test
tape,
recorded
at
the
specified
level
setting
with
bias
control
in
high
position,
during
playback
the
output
level
variations
should
not
exceed
those
shown
in
the
below
chart.
°
7-1/2ips:
0.5dB
at
400Hz
1.0dB at 10kHz
3-3/4ips: 1.0dB at 5kHz