Teac A-450 - Page 36

|
|
|
ensure VIVI aU uu
cation from reference level when Doiby
(Variation a Hz
-|-|Z}4
ffect
=
2-6
ee
NE
Efiee
4
NR
switch
is
switched
from
OUT
to
IN.
paper
an
easurement
pee
ee
ce
rr)
a
eee
an
_
ee
Ison
ate
OA
pennant
ee
_
zest
—
—
=
=
ss
oo
a
1
Adjust
Attenuator
for
specification.
3.2
mV
(—48
dB)
at
e
3.2
mV
of
specification
is
reference
10
kHz
Dolby
T.P.
level
for
next
test.
oe
be
‘2
Set
as
necessary
for
spe-
_
=
=
=
_
=
=
ee
ee
1
cified
output
level
Ensure
VTVM
reading
reduces
to
specifi-
Variation
at
10
kHz:
cation
from
reference
level.
10
dB+l
dB
{
ae
J
400
Hz/—14
dB
(54
mV)
Note
VIVM
reading
for
reference
level
for
Fe
next test.
Ensure
VTVM
reading
raises
to
specifica-
Variation
with
SOURCE
-~|-
L
10
kHz/—14
dB
tion
from
reference
level
when
input
signal
at
PM
position:
Dolby
FM
Compensator
frequency
is
changed.
8
dB+i
dB
2-7
|
Efficiency
Checks
=>
>
+
SSeS
les
Sa
pp
oF
SSeS
Saes
=
ei
=
LINE
&
MIC
control
setting
is
ineffective.
_|e
|
400
Hz/—14
dB
Alais
eae
reading
for
reference
level
for
e
next test.
ae
=
p
7
4
a
A
_
,
7
Z
Variation
with
ae
Ens
Vv
ading
differs
wit!
si-
-)-|+}s
ae
eich
set
to
NORMAL
;
(0
dB+!
dB)
fin
Test
tape:
MTT-5O5TB:
For
BIAS
1/EQ
1
(CrO2)
Wl.
RECORDING
PERFORMANCE
MTT-504T:
For
BIAS
2/EQ
2
(Fe-Cr)
MTT-501:
For
BIAS
3/EQ
3
(Hi-Fi)
NOTE:
*
means
see
REMARKS
column.
J
{|OUTPUT:
Specified
setting
Adjust
with
REC-PAUSE
mode
using
an
3-1
|Bias
Trap
Adjustments
G|-|-|2
=
z
LINE:
Specified
setting
|
No
signal
applied
seeotie
ae
:
”
preted
L102/202
Minimum
output
Q|MIc:
Minimum
;
T
5
=
1
kHz/—15
dB
(137
mV)
|
Coarse
adjustment
0.5
dB
over
bias
Alternately
ea
1
kilz/—38
dB
(9.75
MV)
|)
ine
adjustment
VC101/201
|
Equal
value
at
both
fre-
&
quencies
:
.
.
10
kHz/—38
dB
Approach
final
adjustment
by
turning
VR
rr
-+-44
-
~
-
-
_
—_
-
—---
-
--
clockwise.
Finally
1
kHz
output
must
be
13
1
kHz/—15
dB
(137
mV)
|Coarse
adjustment
0.5
dB
over
bias
between
peak
&
1.5
dB
over
bias.
3-2
|
Record
Bias
Setting
F
Lid
1
Alternately
wee
ee
nen
nef
2|2
ie
Fqual
vz
F
2
14
1
kHz/—38
dB
(9.75
mV)
[isn,
adjustment
VC102/202
Equal
value
at
both
fre
!
&
quencies
10 kHz/—38 dB
ter
tied
|
foo
t—<“‘iéSC‘*Y
Ree
ba
Alternately
15
3/3/Z
400
Hz/—38
dB
(9.75
mV)
=
VC103/203
10
kHz
output
should
be
Approach
final
adjustment
by
turning
VR
&
4
dB
above
400
Hz.
clockwise.
10 kHz/—38 dB
ie
1/1
VR103/203
=
ce
ee
tO
rr
a
Ce
ree
Sr
EVP
3-3
|
Record
Level
Setting
|2
Fi2|2
S
Lyd
4
400
Hz/—5
dB
(435
mV)
=
VR104/204
|
—5
dB
(435
mV)
hee
13
3|
3
a
|
|
VR105/205
Ld
L
.5%
or
tess
on
Distorti
3-4
|Distortion
Checks
V2IH[212)
4b)
444
1
400
Hz/--8
dB
(308
mV)
=
|
ee
2
a
oF
ess
on
Distortion
m3
|
|
[eds
Analyzer
Re
a
203
ire
R
ne
Be
t
1
30
Hz
~
14
kHz/—38
dB
PE
eae
See
Frequency
Response
L103
~
205
nly
for
high
fi
3-5
requency
Response
2iFI2/2
Lhd
J
(9.75
mV)
a!
L105/205
Limits
on
page
24
in
the
;
are
only
for
high
frequency
—
Overall
—
b—4
al
ea
lee
a
en
ere
eaaniial
spectrum
adjustment.
3
31/314
30
Hz
~
12
kHz/—
38
dB
L104/204
,
a |
y
Tal
Waker,
—52
dB
min.
(1.94
mV)
i
1)
4
2
H
(Corresponds
to
S/N
ratio
ei
5
ae.
&
Signal
to
Noise
Ratio
F
{
.
‘
ompare
reading
to
standard
—
-6
5
signal
applied
=
=
of
47
dB
min.)
3
oui
51°
st
5|8
Lit
1
No
signal
applie
|
SAG
ena)
dB
OUTPUT
level
for
S/N
ratio.
2]
1212)
=
min.
(2.44
m
rn
lala
:
(45
dB
min.)
qT
:
,
a
OTe
kes
tes
Get
difference
between
signal
recorded}
:
Ordinarily
measurements
for
BIAS/EQ
“2
3-7
|
Erase
Efficiency
Pity
ti
dads
Fs
4
1
kHz/+5
dB
(1.37
V)
portion
and
its
erased
portion.
|
65
dB
min.
4"
are
iol
neeoseaTi
Record only L-ch and find differences be-l
3-8
|
Channel
Separation
wldibibidyd
4
|
kHz/—5
dB
(435
mV)
tween
its
recorded
portion
(L-ch)
and
no}
=
*
Do
not
connect
LINE
IN
—
(R).
signal recorded portion (R-ch).
af
+
=
|
|
Record
signal
on
only
R-ch
and
note
out-!
Adjacent
Track
Crosstalk
put
level
of
its
recorded
portion.
Next)
Tape
must
be
completely
erased
or
de-
3-9
;
.
Jyh
bps
isis
4
125
Hz/-5
dB
(435
mV)
Jinvert
tape,
then
play
it
and
measure;
-
agora
:
Measurement
i
P
:
magnetized
prior
to
this
procedure.
output level. Obtain output level differ-
ences between both sides.
peAS
is
Bak
OSCILLOSCOPE
AMP SPKR
OSCILLATOR
DECK
under TEST
ATTENUATOR
1-390
vTVM
Lior /L202
' @
Cia Cane
Q05/0205
R/P HEAD
T-40y-t
OSCILLOSCOPE
T-39a-1
OSCILLOSCOPE
OSCILLATOR
To 391-1
OSCILLOSCOPE
AMP SPKR
OSCILLATOR
DECK
under TEST
ATTENUATOR
Tr 393+!