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Teac A-650 - Playback Performance Verification (Continued); Specified Output Level Setting Procedure; Playback Frequency Response Testing

Teac A-650
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6-2-2.
SPECIFIED
OUTPUT
LEVEL
SETTING
Preparations:
(A)
»
3.
4.
&
7.
T-
590
DECK
under
TEST
(B)
VTVM
6-2-3.
FREQUENCY
RESPONSE
-PLAYBACK-
o
o
Switch
Setting:
DOLBY
NR
LIMITER
EQ
BIAS
OUT
IN
3
9.
L
Fig.
6-7
Playback
Frequency
Response
Limits
22
5.
6.
Control
Setting:
OUTPUT:
Set
for
convenient
output
level.
n
i
r
1.
2.
DECK
under
TEST
IMPORTANT
After
this
setting
is
done,
do
not
disturb
the
Specified
Control
Setting
of
the
OUTPUT
controls
until
the
remaining
checks
and
adjustments
are
completed.
Load
and
play
a
TEAC
MTT-150
test
tape.
Adjust
VR102/202
for
580
mV
(-2.5
dB)
on
VTVM
connected
to
the
CAL
test
points,
as
shown
in
(A)
of
Fig.
6-6.
Change
the
VTVM
connection
to
the
OUTPUT
jacks
as
shown
in
(B)
of
Diagram.
Place
the
DOLBY
NR
IN-0UT-1N/MPX
switch
in
the
OUT
position.
Set
the
OUTPUT
controls
fully
clockwise.
Confirm
that
the
output
level
is
+
1
dB
±
I
dB
(0.775
V
-0.975
V).
Set
the
OUTPUT
controls
for
a
reading
of
-5
dB
(435
mV).
This
is
the
specified
output
level.
At
this
time,
the
physical
position
of
the
OUTPUT
controls
indi
cates
the
Specified
Control
Setting
referred
to
in
sub
sequent
procedures.
MTT-116U
“
3"
position
SPKR
OSCILLOSCOP
E
Oi
«'•
•
<
e
d
VTVM
s
I
.
'it
<0
w
Hi-Fi
TAPE
10.
Repeat
the
above
procedure,
with
the
following
ex
ceptions.
Test
tape.
EQ
switch.
NOTE
If
the
response
does
not
meet
the
specified
response
limits,
the
head
should
be
checked
for
accumulated
oxide
or
dirt.
Then,
if
no
dirt
is
found
the
head
azimuth
should
be
readjusted.
NOTE
In
the
following
procedure,
adjust
VR101/201
so
that
the
measured
values
on
all
settings
of
the
EQ
switch
are
within
the
specified
response
limits.
TEST
TAPE:
MTT-116U
(EQ
3)
Ll-l
MTT-116K
(EQ
1,
2)
Specifications:
Specified
output
level:
—
5
dB
(435
mV)
Maximum
output
level:
+1
dB
±
1
dB
(0.775
V-
0.975
V)
CrO
;
&
Fe-Cr
TAPES
8.
Load
a
TEAC
MTT-116K
test
tape
and
play
its
test
signals
from
40
Hz
up
to
14
kHz.
Adjust
VR1
01/201
so
that
the
readings
of
the
higher
frequency
signals
on
the
VTVM
are
within
the
response
.
limits.
AMP
DOLBY
B-TYPE
PROCESSOR
PC
BOARD
£
c
.♦
f
"
i
■
•
■
~i
yTT
'
A
’
B
—
Will
I
‘
'i
!
nW
;
»•»
400
'«
rxtouihcv
IN
H,
Fig.
6-6
Connection

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