Teac A-450 - Page 35

STEP
NO.
A-450
ELECTRICAL
CHECKS
AND
ADJUSTMENTS
ITEM
INPUT
SOURCE SIGNAL
CONTROLS
OTHER CONDITIONS OR
OPERATION
ADJUST-
MENT ON
DECK
SPECIFICATION
REMARKS
J. PLAYBACK PERFORMANCE
Test tape: MTT-150: For Dolby Level Calibration
MTT-116K: For Frequency response test for EQ 1 & 2
MTT-116U:
For Frequency response test for EQ 3
—_
MTT-150
Ensure phase relationship between L-ch
Phase 45° on oscilloscope | Phase relationship check
T
'
i R/P Head Azimuth | al—|3 5 5 os OUTPUT: Set as necessary & R-ch. Azimuth adj.
Adjustments Fe o|O for usable output level. bee ac Sem “| nut of head 7 ad
1x2
MTT-116U,
10
kHz
section
Maximum
+-
tl
B
VR102/202_
100
mV
(—18
dB)
at
Dolby
T.P.
fn
hs
-
Foren
2
OUTPUTS
Maxtnn
-
*
3.5
dbH1
dB
M:
ximum
output
Level
1-2
Specified
Output
i
hf
hee
epee
eee
eee
MTT-150
ee
(461
mV
~
580
mV)
ee
*
.
Level
Setting
|
le
OUTPUT:
Set
to
get
specified
13
OUTPUT
indicated
in
spe-
-
—5
dB
(435
mV)
Specified
Output
Level
H [ cification column.
VU
Meter
Calibration
|
Aas
P
After
calibrating,
ensure
VU
meter
indica-
1-3
|
_
playback
—
Li-|}4}
4]
4]
-|OUTPUT:
Specified
setting]
MTT-150
=
VR107/207
{+3
VU
(0)
on
VU
meter|
tion
is
same,
when
DOLBY
NR
switch
is
set to IN.
oe Be
44
MTT-116U,
VRIO1/201
are
only
for
high
frequency
Frequency
Response
V1
4
ls
40
Hz
~
14
kHz
section
See
Frequency
Response
|
spectrum
adjustment.
aaa
Play
back
—
ae
ie
a
¥
z
4
=
VR101/201
|
Limits
on
page
18
in
the
|For
HiFi
tape.
i
r
9
MTT-116K
fe
a,
manual.
>
al
creas
eat
-
oo
a
|
$
40
liz
~
14
kHz
section
For
CrO2
&
Fe-Cr
tapes.
:
:
ee
oe
~52
dB
min.,
or
1.94
mV
|Measure
OUTPUT
level
of
noise
signal
and
al
to
Noise
Ratio
Checks
g
1-5
sn
oo
BE
aL
bee
1
MTT-150
PLAY-PAUSE
mode
=
max.
(Corresponds
to
S/N
|
compare
this
to
standard
OUTPUT
level
[eveoteic||
re
aso
mn
Ne
ee
ean
es:
Cate
ratio
of
47
dB
min.)
of
~5
dB.
Headphone
Output
Level
_
"
;
=
—21
dB+2
dB
;
:
16
ticcks
D
aR
2]
1
MTT-150
(54.8
mV
~
86
mV)
Load
imp.:
8
ohm
—_ ld
Test tape: Any recordable tape
II. MONITOR PERFORMANCE
RECORD-PAUSE mode
2-1
Minimum Input Level Checks
400 Hz/—67 dB+2 dB
OUTPUT: Specified Setting|/(274 uV ~ 435 pV)
NOTE: * means see REMARKS column.
Check by applying test signal to MIC jacks,
Minimum
Maximum
400 Hz/—35 dB+2 dB
(10.9 mV ~ 17.3 mV)
OUT
OUT
Check by applying test signal to input
terminals of DIN Connector.
400 Hz/—15 dB+2,dB
(109 mV ~ 173 mV)
NORMAL
Maximum
Minimum
Check by applying test signal to LINE IN
jacks.
100 mV (— 18 dB)
at Dolby T.P.
For MIC jacks
For DIN connector
For LINE IN jacks
Specified LINE
OUTPUT:
LINE:
Specified Setting
Set controls to
400 Hz/—5 dB (435 mV)
100 mV (—18 dB) at
Use LINE IN jack
2-2
;
4
get
specified
Set
LINE
controls
for
specification.
©
Input
level
of
—5
dB:
Comal
eur
OUTPUT
poly
iE
Specified
Input
Level
for
LINE
MIC:
Minimum
.
e
LINE
&
MIC
control
setting
do
not
OUTPUT:
Specified
Setting
DOLBY
FM
DOLBY
FM/COPY
CAL
100
mV
(-18
dB)
at
affect
level.
2-3
;
R:
ifi
i
z
Controt
Setting
‘
fies
nian
Setting|400
Hz/—14
dB
(154
mV)
ee
Dolby
T.P.
e
Input
level
of
—14
dB:
Specified
Input
:
se
Seren
level
for
DOLBY
FM/COPY
Vv
,
‘
a
ea
ee
4
4
400
Hz/—5
dB
(435
mV)
VR106/206
|+3VU
(DO)
on
VU
meter
PEAK
Indicator
Lights
at
7S
eae
ok
nie
4
1
ce
eer
aan
VR108/208
ie
mad
ne
a
;
Indicator
Calibration
ae
aN?
ABOCS:
0
ve
400
Hz/—4
dB
(488
mV)
completely
when
input
is
~4
dB
*
Use
LINE
IN
jack
4
Adjust
Attenuator
for
specification.
POY
6
ee
at
e
LINE
&
MIC
control
setting
is
in-
1
kHz
Dolby
T.P.
effective.
t
4
Set
as
necessary
for
spe-
1
e
10
mV
of
specification
is
reference
on
a
Ga
cified
output
level
na
Tees
PRET
Te
5
=
level
for
next
step.
:
rama
eet
(Variation
a1
:
3.6
|Dolby
NR
Effect
m
\
BOND
heen
eee
y
5
dBtl
dB
Measurement
ee
hacen
Gx
ag
ee
cae
a
a
Sela
Sa
Ca
rh
mie
Sa
eel
ane
soviet
5
Adjust
Attenuator
for
specification.
3.2
mV
(~48
dB)
at
©
3.2
mV
of
specification
is
reference
‘o)
10
kHz
Dolby
T.P.
level
for
next
test.
eat
ac
nereceary
for
ene-
0 dB =0.775 V
A
F
CONNECTIONS
OSCILLOSCOPE
DECK
under TEST
Y= 39-2
VTVM
DECK under TEST
OSCILLOSCOPE
DECK
under TEST
VTVM
DECK under TEST
OSCILLATOR
DECK under TEST
OSCILLOSCOPE
AMP
477
CORR